hash
stringlengths 64
64
| content
stringlengths 0
1.51M
|
|---|---|
ca7f9b10c4608e0209b6fd664a31779dcf6320e1fda41bd1af7b4ab2a6b97e37 | import ctypes
import itertools
import json
import pickle
import random
from binascii import a2b_hex
from io import BytesIO
from unittest import mock, skipIf
from django.contrib.gis import gdal
from django.contrib.gis.geos import (
GeometryCollection, GEOSException, GEOSGeometry, LinearRing, LineString,
MultiLineString, MultiPoint, MultiPolygon, Point, Polygon, fromfile,
fromstr,
)
from django.contrib.gis.geos.libgeos import geos_version_tuple
from django.contrib.gis.shortcuts import numpy
from django.template import Context
from django.template.engine import Engine
from django.test import SimpleTestCase
from ..test_data import TestDataMixin
class GEOSTest(SimpleTestCase, TestDataMixin):
def test_wkt(self):
"Testing WKT output."
for g in self.geometries.wkt_out:
geom = fromstr(g.wkt)
if geom.hasz:
self.assertEqual(g.ewkt, geom.wkt)
def test_hex(self):
"Testing HEX output."
for g in self.geometries.hex_wkt:
geom = fromstr(g.wkt)
self.assertEqual(g.hex, geom.hex.decode())
def test_hexewkb(self):
"Testing (HEX)EWKB output."
# For testing HEX(EWKB).
ogc_hex = b'01010000000000000000000000000000000000F03F'
ogc_hex_3d = b'01010000800000000000000000000000000000F03F0000000000000040'
# `SELECT ST_AsHEXEWKB(ST_GeomFromText('POINT(0 1)', 4326));`
hexewkb_2d = b'0101000020E61000000000000000000000000000000000F03F'
# `SELECT ST_AsHEXEWKB(ST_GeomFromEWKT('SRID=4326;POINT(0 1 2)'));`
hexewkb_3d = b'01010000A0E61000000000000000000000000000000000F03F0000000000000040'
pnt_2d = Point(0, 1, srid=4326)
pnt_3d = Point(0, 1, 2, srid=4326)
# OGC-compliant HEX will not have SRID value.
self.assertEqual(ogc_hex, pnt_2d.hex)
self.assertEqual(ogc_hex_3d, pnt_3d.hex)
# HEXEWKB should be appropriate for its dimension -- have to use an
# a WKBWriter w/dimension set accordingly, else GEOS will insert
# garbage into 3D coordinate if there is none.
self.assertEqual(hexewkb_2d, pnt_2d.hexewkb)
self.assertEqual(hexewkb_3d, pnt_3d.hexewkb)
self.assertIs(GEOSGeometry(hexewkb_3d).hasz, True)
# Same for EWKB.
self.assertEqual(memoryview(a2b_hex(hexewkb_2d)), pnt_2d.ewkb)
self.assertEqual(memoryview(a2b_hex(hexewkb_3d)), pnt_3d.ewkb)
# Redundant sanity check.
self.assertEqual(4326, GEOSGeometry(hexewkb_2d).srid)
def test_kml(self):
"Testing KML output."
for tg in self.geometries.wkt_out:
geom = fromstr(tg.wkt)
kml = getattr(tg, 'kml', False)
if kml:
self.assertEqual(kml, geom.kml)
def test_errors(self):
"Testing the Error handlers."
# string-based
for err in self.geometries.errors:
with self.assertRaises((GEOSException, ValueError)):
fromstr(err.wkt)
# Bad WKB
with self.assertRaises(GEOSException):
GEOSGeometry(memoryview(b'0'))
class NotAGeometry:
pass
# Some other object
with self.assertRaises(TypeError):
GEOSGeometry(NotAGeometry())
# None
with self.assertRaises(TypeError):
GEOSGeometry(None)
def test_wkb(self):
"Testing WKB output."
for g in self.geometries.hex_wkt:
geom = fromstr(g.wkt)
wkb = geom.wkb
self.assertEqual(wkb.hex().upper(), g.hex)
def test_create_hex(self):
"Testing creation from HEX."
for g in self.geometries.hex_wkt:
geom_h = GEOSGeometry(g.hex)
# we need to do this so decimal places get normalized
geom_t = fromstr(g.wkt)
self.assertEqual(geom_t.wkt, geom_h.wkt)
def test_create_wkb(self):
"Testing creation from WKB."
for g in self.geometries.hex_wkt:
wkb = memoryview(bytes.fromhex(g.hex))
geom_h = GEOSGeometry(wkb)
# we need to do this so decimal places get normalized
geom_t = fromstr(g.wkt)
self.assertEqual(geom_t.wkt, geom_h.wkt)
def test_ewkt(self):
"Testing EWKT."
srids = (-1, 32140)
for srid in srids:
for p in self.geometries.polygons:
ewkt = 'SRID=%d;%s' % (srid, p.wkt)
poly = fromstr(ewkt)
self.assertEqual(srid, poly.srid)
self.assertEqual(srid, poly.shell.srid)
self.assertEqual(srid, fromstr(poly.ewkt).srid) # Checking export
def test_json(self):
"Testing GeoJSON input/output (via GDAL)."
for g in self.geometries.json_geoms:
geom = GEOSGeometry(g.wkt)
if not hasattr(g, 'not_equal'):
# Loading jsons to prevent decimal differences
self.assertEqual(json.loads(g.json), json.loads(geom.json))
self.assertEqual(json.loads(g.json), json.loads(geom.geojson))
self.assertEqual(GEOSGeometry(g.wkt, 4326), GEOSGeometry(geom.json))
def test_json_srid(self):
geojson_data = {
"type": "Point",
"coordinates": [2, 49],
"crs": {
"type": "name",
"properties": {
"name": "urn:ogc:def:crs:EPSG::4322"
}
}
}
self.assertEqual(GEOSGeometry(json.dumps(geojson_data)), Point(2, 49, srid=4322))
def test_fromfile(self):
"Testing the fromfile() factory."
ref_pnt = GEOSGeometry('POINT(5 23)')
wkt_f = BytesIO()
wkt_f.write(ref_pnt.wkt.encode())
wkb_f = BytesIO()
wkb_f.write(bytes(ref_pnt.wkb))
# Other tests use `fromfile()` on string filenames so those
# aren't tested here.
for fh in (wkt_f, wkb_f):
fh.seek(0)
pnt = fromfile(fh)
self.assertEqual(ref_pnt, pnt)
def test_eq(self):
"Testing equivalence."
p = fromstr('POINT(5 23)')
self.assertEqual(p, p.wkt)
self.assertNotEqual(p, 'foo')
ls = fromstr('LINESTRING(0 0, 1 1, 5 5)')
self.assertEqual(ls, ls.wkt)
self.assertNotEqual(p, 'bar')
self.assertEqual(p, 'POINT(5.0 23.0)')
# Error shouldn't be raise on equivalence testing with
# an invalid type.
for g in (p, ls):
self.assertIsNotNone(g)
self.assertNotEqual(g, {'foo': 'bar'})
self.assertIsNot(g, False)
def test_hash(self):
point_1 = Point(5, 23)
point_2 = Point(5, 23, srid=4326)
point_3 = Point(5, 23, srid=32632)
multipoint_1 = MultiPoint(point_1, srid=4326)
multipoint_2 = MultiPoint(point_2)
multipoint_3 = MultiPoint(point_3)
self.assertNotEqual(hash(point_1), hash(point_2))
self.assertNotEqual(hash(point_1), hash(point_3))
self.assertNotEqual(hash(point_2), hash(point_3))
self.assertNotEqual(hash(multipoint_1), hash(multipoint_2))
self.assertEqual(hash(multipoint_2), hash(multipoint_3))
self.assertNotEqual(hash(multipoint_1), hash(point_1))
self.assertNotEqual(hash(multipoint_2), hash(point_2))
self.assertNotEqual(hash(multipoint_3), hash(point_3))
def test_eq_with_srid(self):
"Testing non-equivalence with different srids."
p0 = Point(5, 23)
p1 = Point(5, 23, srid=4326)
p2 = Point(5, 23, srid=32632)
# GEOS
self.assertNotEqual(p0, p1)
self.assertNotEqual(p1, p2)
# EWKT
self.assertNotEqual(p0, p1.ewkt)
self.assertNotEqual(p1, p0.ewkt)
self.assertNotEqual(p1, p2.ewkt)
# Equivalence with matching SRIDs
self.assertEqual(p2, p2)
self.assertEqual(p2, p2.ewkt)
# WKT contains no SRID so will not equal
self.assertNotEqual(p2, p2.wkt)
# SRID of 0
self.assertEqual(p0, 'SRID=0;POINT (5 23)')
self.assertNotEqual(p1, 'SRID=0;POINT (5 23)')
def test_points(self):
"Testing Point objects."
prev = fromstr('POINT(0 0)')
for p in self.geometries.points:
# Creating the point from the WKT
pnt = fromstr(p.wkt)
self.assertEqual(pnt.geom_type, 'Point')
self.assertEqual(pnt.geom_typeid, 0)
self.assertEqual(pnt.dims, 0)
self.assertEqual(p.x, pnt.x)
self.assertEqual(p.y, pnt.y)
self.assertEqual(pnt, fromstr(p.wkt))
self.assertIs(pnt == prev, False) # Use assertIs() to test __eq__.
# Making sure that the point's X, Y components are what we expect
self.assertAlmostEqual(p.x, pnt.tuple[0], 9)
self.assertAlmostEqual(p.y, pnt.tuple[1], 9)
# Testing the third dimension, and getting the tuple arguments
if hasattr(p, 'z'):
self.assertIs(pnt.hasz, True)
self.assertEqual(p.z, pnt.z)
self.assertEqual(p.z, pnt.tuple[2], 9)
tup_args = (p.x, p.y, p.z)
set_tup1 = (2.71, 3.14, 5.23)
set_tup2 = (5.23, 2.71, 3.14)
else:
self.assertIs(pnt.hasz, False)
self.assertIsNone(pnt.z)
tup_args = (p.x, p.y)
set_tup1 = (2.71, 3.14)
set_tup2 = (3.14, 2.71)
# Centroid operation on point should be point itself
self.assertEqual(p.centroid, pnt.centroid.tuple)
# Now testing the different constructors
pnt2 = Point(tup_args) # e.g., Point((1, 2))
pnt3 = Point(*tup_args) # e.g., Point(1, 2)
self.assertEqual(pnt, pnt2)
self.assertEqual(pnt, pnt3)
# Now testing setting the x and y
pnt.y = 3.14
pnt.x = 2.71
self.assertEqual(3.14, pnt.y)
self.assertEqual(2.71, pnt.x)
# Setting via the tuple/coords property
pnt.tuple = set_tup1
self.assertEqual(set_tup1, pnt.tuple)
pnt.coords = set_tup2
self.assertEqual(set_tup2, pnt.coords)
prev = pnt # setting the previous geometry
def test_point_reverse(self):
point = GEOSGeometry('POINT(144.963 -37.8143)', 4326)
self.assertEqual(point.srid, 4326)
point.reverse()
self.assertEqual(point.ewkt, 'SRID=4326;POINT (-37.8143 144.963)')
def test_multipoints(self):
"Testing MultiPoint objects."
for mp in self.geometries.multipoints:
mpnt = fromstr(mp.wkt)
self.assertEqual(mpnt.geom_type, 'MultiPoint')
self.assertEqual(mpnt.geom_typeid, 4)
self.assertEqual(mpnt.dims, 0)
self.assertAlmostEqual(mp.centroid[0], mpnt.centroid.tuple[0], 9)
self.assertAlmostEqual(mp.centroid[1], mpnt.centroid.tuple[1], 9)
with self.assertRaises(IndexError):
mpnt.__getitem__(len(mpnt))
self.assertEqual(mp.centroid, mpnt.centroid.tuple)
self.assertEqual(mp.coords, tuple(m.tuple for m in mpnt))
for p in mpnt:
self.assertEqual(p.geom_type, 'Point')
self.assertEqual(p.geom_typeid, 0)
self.assertIs(p.empty, False)
self.assertIs(p.valid, True)
def test_linestring(self):
"Testing LineString objects."
prev = fromstr('POINT(0 0)')
for l in self.geometries.linestrings:
ls = fromstr(l.wkt)
self.assertEqual(ls.geom_type, 'LineString')
self.assertEqual(ls.geom_typeid, 1)
self.assertEqual(ls.dims, 1)
self.assertIs(ls.empty, False)
self.assertIs(ls.ring, False)
if hasattr(l, 'centroid'):
self.assertEqual(l.centroid, ls.centroid.tuple)
if hasattr(l, 'tup'):
self.assertEqual(l.tup, ls.tuple)
self.assertEqual(ls, fromstr(l.wkt))
self.assertIs(ls == prev, False) # Use assertIs() to test __eq__.
with self.assertRaises(IndexError):
ls.__getitem__(len(ls))
prev = ls
# Creating a LineString from a tuple, list, and numpy array
self.assertEqual(ls, LineString(ls.tuple)) # tuple
self.assertEqual(ls, LineString(*ls.tuple)) # as individual arguments
self.assertEqual(ls, LineString([list(tup) for tup in ls.tuple])) # as list
# Point individual arguments
self.assertEqual(ls.wkt, LineString(*tuple(Point(tup) for tup in ls.tuple)).wkt)
if numpy:
self.assertEqual(ls, LineString(numpy.array(ls.tuple))) # as numpy array
with self.assertRaisesMessage(TypeError, 'Each coordinate should be a sequence (list or tuple)'):
LineString((0, 0))
with self.assertRaisesMessage(ValueError, 'LineString requires at least 2 points, got 1.'):
LineString([(0, 0)])
if numpy:
with self.assertRaisesMessage(ValueError, 'LineString requires at least 2 points, got 1.'):
LineString(numpy.array([(0, 0)]))
with mock.patch('django.contrib.gis.geos.linestring.numpy', False):
with self.assertRaisesMessage(TypeError, 'Invalid initialization input for LineStrings.'):
LineString('wrong input')
# Test __iter__().
self.assertEqual(list(LineString((0, 0), (1, 1), (2, 2))), [(0, 0), (1, 1), (2, 2)])
def test_linestring_reverse(self):
line = GEOSGeometry('LINESTRING(144.963 -37.8143,151.2607 -33.887)', 4326)
self.assertEqual(line.srid, 4326)
line.reverse()
self.assertEqual(line.ewkt, 'SRID=4326;LINESTRING (151.2607 -33.887, 144.963 -37.8143)')
def _test_is_counterclockwise(self):
lr = LinearRing((0, 0), (1, 0), (0, 1), (0, 0))
self.assertIs(lr.is_counterclockwise, True)
lr.reverse()
self.assertIs(lr.is_counterclockwise, False)
msg = 'Orientation of an empty LinearRing cannot be determined.'
with self.assertRaisesMessage(ValueError, msg):
LinearRing().is_counterclockwise
@skipIf(geos_version_tuple() < (3, 7), 'GEOS >= 3.7.0 is required')
def test_is_counterclockwise(self):
self._test_is_counterclockwise()
@skipIf(geos_version_tuple() < (3, 7), 'GEOS >= 3.7.0 is required')
def test_is_counterclockwise_geos_error(self):
with mock.patch('django.contrib.gis.geos.prototypes.cs_is_ccw') as mocked:
mocked.return_value = 0
mocked.func_name = 'GEOSCoordSeq_isCCW'
msg = 'Error encountered in GEOS C function "GEOSCoordSeq_isCCW".'
with self.assertRaisesMessage(GEOSException, msg):
LinearRing((0, 0), (1, 0), (0, 1), (0, 0)).is_counterclockwise
@mock.patch('django.contrib.gis.geos.libgeos.geos_version', lambda: b'3.6.9')
def test_is_counterclockwise_fallback(self):
self._test_is_counterclockwise()
def test_multilinestring(self):
"Testing MultiLineString objects."
prev = fromstr('POINT(0 0)')
for l in self.geometries.multilinestrings:
ml = fromstr(l.wkt)
self.assertEqual(ml.geom_type, 'MultiLineString')
self.assertEqual(ml.geom_typeid, 5)
self.assertEqual(ml.dims, 1)
self.assertAlmostEqual(l.centroid[0], ml.centroid.x, 9)
self.assertAlmostEqual(l.centroid[1], ml.centroid.y, 9)
self.assertEqual(ml, fromstr(l.wkt))
self.assertIs(ml == prev, False) # Use assertIs() to test __eq__.
prev = ml
for ls in ml:
self.assertEqual(ls.geom_type, 'LineString')
self.assertEqual(ls.geom_typeid, 1)
self.assertIs(ls.empty, False)
with self.assertRaises(IndexError):
ml.__getitem__(len(ml))
self.assertEqual(ml.wkt, MultiLineString(*tuple(s.clone() for s in ml)).wkt)
self.assertEqual(ml, MultiLineString(*tuple(LineString(s.tuple) for s in ml)))
def test_linearring(self):
"Testing LinearRing objects."
for rr in self.geometries.linearrings:
lr = fromstr(rr.wkt)
self.assertEqual(lr.geom_type, 'LinearRing')
self.assertEqual(lr.geom_typeid, 2)
self.assertEqual(lr.dims, 1)
self.assertEqual(rr.n_p, len(lr))
self.assertIs(lr.valid, True)
self.assertIs(lr.empty, False)
# Creating a LinearRing from a tuple, list, and numpy array
self.assertEqual(lr, LinearRing(lr.tuple))
self.assertEqual(lr, LinearRing(*lr.tuple))
self.assertEqual(lr, LinearRing([list(tup) for tup in lr.tuple]))
if numpy:
self.assertEqual(lr, LinearRing(numpy.array(lr.tuple)))
with self.assertRaisesMessage(ValueError, 'LinearRing requires at least 4 points, got 3.'):
LinearRing((0, 0), (1, 1), (0, 0))
with self.assertRaisesMessage(ValueError, 'LinearRing requires at least 4 points, got 1.'):
LinearRing([(0, 0)])
if numpy:
with self.assertRaisesMessage(ValueError, 'LinearRing requires at least 4 points, got 1.'):
LinearRing(numpy.array([(0, 0)]))
def test_linearring_json(self):
self.assertJSONEqual(
LinearRing((0, 0), (0, 1), (1, 1), (0, 0)).json,
'{"coordinates": [[0, 0], [0, 1], [1, 1], [0, 0]], "type": "LineString"}',
)
def test_polygons_from_bbox(self):
"Testing `from_bbox` class method."
bbox = (-180, -90, 180, 90)
p = Polygon.from_bbox(bbox)
self.assertEqual(bbox, p.extent)
# Testing numerical precision
x = 3.14159265358979323
bbox = (0, 0, 1, x)
p = Polygon.from_bbox(bbox)
y = p.extent[-1]
self.assertEqual(format(x, '.13f'), format(y, '.13f'))
def test_polygons(self):
"Testing Polygon objects."
prev = fromstr('POINT(0 0)')
for p in self.geometries.polygons:
# Creating the Polygon, testing its properties.
poly = fromstr(p.wkt)
self.assertEqual(poly.geom_type, 'Polygon')
self.assertEqual(poly.geom_typeid, 3)
self.assertEqual(poly.dims, 2)
self.assertIs(poly.empty, False)
self.assertIs(poly.ring, False)
self.assertEqual(p.n_i, poly.num_interior_rings)
self.assertEqual(p.n_i + 1, len(poly)) # Testing __len__
self.assertEqual(p.n_p, poly.num_points)
# Area & Centroid
self.assertAlmostEqual(p.area, poly.area, 9)
self.assertAlmostEqual(p.centroid[0], poly.centroid.tuple[0], 9)
self.assertAlmostEqual(p.centroid[1], poly.centroid.tuple[1], 9)
# Testing the geometry equivalence
self.assertEqual(poly, fromstr(p.wkt))
# Should not be equal to previous geometry
self.assertIs(poly == prev, False) # Use assertIs() to test __eq__.
self.assertIs(poly != prev, True) # Use assertIs() to test __ne__.
# Testing the exterior ring
ring = poly.exterior_ring
self.assertEqual(ring.geom_type, 'LinearRing')
self.assertEqual(ring.geom_typeid, 2)
if p.ext_ring_cs:
self.assertEqual(p.ext_ring_cs, ring.tuple)
self.assertEqual(p.ext_ring_cs, poly[0].tuple) # Testing __getitem__
# Testing __getitem__ and __setitem__ on invalid indices
with self.assertRaises(IndexError):
poly.__getitem__(len(poly))
with self.assertRaises(IndexError):
poly.__setitem__(len(poly), False)
with self.assertRaises(IndexError):
poly.__getitem__(-1 * len(poly) - 1)
# Testing __iter__
for r in poly:
self.assertEqual(r.geom_type, 'LinearRing')
self.assertEqual(r.geom_typeid, 2)
# Testing polygon construction.
with self.assertRaises(TypeError):
Polygon(0, [1, 2, 3])
with self.assertRaises(TypeError):
Polygon('foo')
# Polygon(shell, (hole1, ... holeN))
ext_ring, *int_rings = poly
self.assertEqual(poly, Polygon(ext_ring, int_rings))
# Polygon(shell_tuple, hole_tuple1, ... , hole_tupleN)
ring_tuples = tuple(r.tuple for r in poly)
self.assertEqual(poly, Polygon(*ring_tuples))
# Constructing with tuples of LinearRings.
self.assertEqual(poly.wkt, Polygon(*tuple(r for r in poly)).wkt)
self.assertEqual(poly.wkt, Polygon(*tuple(LinearRing(r.tuple) for r in poly)).wkt)
def test_polygons_templates(self):
# Accessing Polygon attributes in templates should work.
engine = Engine()
template = engine.from_string('{{ polygons.0.wkt }}')
polygons = [fromstr(p.wkt) for p in self.geometries.multipolygons[:2]]
content = template.render(Context({'polygons': polygons}))
self.assertIn('MULTIPOLYGON (((100', content)
def test_polygon_comparison(self):
p1 = Polygon(((0, 0), (0, 1), (1, 1), (1, 0), (0, 0)))
p2 = Polygon(((0, 0), (0, 1), (1, 0), (0, 0)))
self.assertGreater(p1, p2)
self.assertLess(p2, p1)
p3 = Polygon(((0, 0), (0, 1), (1, 1), (2, 0), (0, 0)))
p4 = Polygon(((0, 0), (0, 1), (2, 2), (1, 0), (0, 0)))
self.assertGreater(p4, p3)
self.assertLess(p3, p4)
def test_multipolygons(self):
"Testing MultiPolygon objects."
fromstr('POINT (0 0)')
for mp in self.geometries.multipolygons:
mpoly = fromstr(mp.wkt)
self.assertEqual(mpoly.geom_type, 'MultiPolygon')
self.assertEqual(mpoly.geom_typeid, 6)
self.assertEqual(mpoly.dims, 2)
self.assertEqual(mp.valid, mpoly.valid)
if mp.valid:
self.assertEqual(mp.num_geom, mpoly.num_geom)
self.assertEqual(mp.n_p, mpoly.num_coords)
self.assertEqual(mp.num_geom, len(mpoly))
with self.assertRaises(IndexError):
mpoly.__getitem__(len(mpoly))
for p in mpoly:
self.assertEqual(p.geom_type, 'Polygon')
self.assertEqual(p.geom_typeid, 3)
self.assertIs(p.valid, True)
self.assertEqual(mpoly.wkt, MultiPolygon(*tuple(poly.clone() for poly in mpoly)).wkt)
def test_memory_hijinks(self):
"Testing Geometry __del__() on rings and polygons."
# #### Memory issues with rings and poly
# These tests are needed to ensure sanity with writable geometries.
# Getting a polygon with interior rings, and pulling out the interior rings
poly = fromstr(self.geometries.polygons[1].wkt)
ring1 = poly[0]
ring2 = poly[1]
# These deletes should be 'harmless' since they are done on child geometries
del ring1
del ring2
ring1 = poly[0]
ring2 = poly[1]
# Deleting the polygon
del poly
# Access to these rings is OK since they are clones.
str(ring1)
str(ring2)
def test_coord_seq(self):
"Testing Coordinate Sequence objects."
for p in self.geometries.polygons:
if p.ext_ring_cs:
# Constructing the polygon and getting the coordinate sequence
poly = fromstr(p.wkt)
cs = poly.exterior_ring.coord_seq
self.assertEqual(p.ext_ring_cs, cs.tuple) # done in the Polygon test too.
self.assertEqual(len(p.ext_ring_cs), len(cs)) # Making sure __len__ works
# Checks __getitem__ and __setitem__
for i in range(len(p.ext_ring_cs)):
c1 = p.ext_ring_cs[i] # Expected value
c2 = cs[i] # Value from coordseq
self.assertEqual(c1, c2)
# Constructing the test value to set the coordinate sequence with
if len(c1) == 2:
tset = (5, 23)
else:
tset = (5, 23, 8)
cs[i] = tset
# Making sure every set point matches what we expect
for j in range(len(tset)):
cs[i] = tset
self.assertEqual(tset[j], cs[i][j])
def test_relate_pattern(self):
"Testing relate() and relate_pattern()."
g = fromstr('POINT (0 0)')
with self.assertRaises(GEOSException):
g.relate_pattern(0, 'invalid pattern, yo')
for rg in self.geometries.relate_geoms:
a = fromstr(rg.wkt_a)
b = fromstr(rg.wkt_b)
self.assertEqual(rg.result, a.relate_pattern(b, rg.pattern))
self.assertEqual(rg.pattern, a.relate(b))
def test_intersection(self):
"Testing intersects() and intersection()."
for i in range(len(self.geometries.topology_geoms)):
a = fromstr(self.geometries.topology_geoms[i].wkt_a)
b = fromstr(self.geometries.topology_geoms[i].wkt_b)
i1 = fromstr(self.geometries.intersect_geoms[i].wkt)
self.assertIs(a.intersects(b), True)
i2 = a.intersection(b)
self.assertEqual(i1, i2)
self.assertEqual(i1, a & b) # __and__ is intersection operator
a &= b # testing __iand__
self.assertEqual(i1, a)
def test_union(self):
"Testing union()."
for i in range(len(self.geometries.topology_geoms)):
a = fromstr(self.geometries.topology_geoms[i].wkt_a)
b = fromstr(self.geometries.topology_geoms[i].wkt_b)
u1 = fromstr(self.geometries.union_geoms[i].wkt)
u2 = a.union(b)
self.assertEqual(u1, u2)
self.assertEqual(u1, a | b) # __or__ is union operator
a |= b # testing __ior__
self.assertEqual(u1, a)
def test_unary_union(self):
"Testing unary_union."
for i in range(len(self.geometries.topology_geoms)):
a = fromstr(self.geometries.topology_geoms[i].wkt_a)
b = fromstr(self.geometries.topology_geoms[i].wkt_b)
u1 = fromstr(self.geometries.union_geoms[i].wkt)
u2 = GeometryCollection(a, b).unary_union
self.assertTrue(u1.equals(u2))
def test_difference(self):
"Testing difference()."
for i in range(len(self.geometries.topology_geoms)):
a = fromstr(self.geometries.topology_geoms[i].wkt_a)
b = fromstr(self.geometries.topology_geoms[i].wkt_b)
d1 = fromstr(self.geometries.diff_geoms[i].wkt)
d2 = a.difference(b)
self.assertEqual(d1, d2)
self.assertEqual(d1, a - b) # __sub__ is difference operator
a -= b # testing __isub__
self.assertEqual(d1, a)
def test_symdifference(self):
"Testing sym_difference()."
for i in range(len(self.geometries.topology_geoms)):
a = fromstr(self.geometries.topology_geoms[i].wkt_a)
b = fromstr(self.geometries.topology_geoms[i].wkt_b)
d1 = fromstr(self.geometries.sdiff_geoms[i].wkt)
d2 = a.sym_difference(b)
self.assertEqual(d1, d2)
self.assertEqual(d1, a ^ b) # __xor__ is symmetric difference operator
a ^= b # testing __ixor__
self.assertEqual(d1, a)
def test_buffer(self):
bg = self.geometries.buffer_geoms[0]
g = fromstr(bg.wkt)
# Can't use a floating-point for the number of quadsegs.
with self.assertRaises(ctypes.ArgumentError):
g.buffer(bg.width, quadsegs=1.1)
self._test_buffer(self.geometries.buffer_geoms, 'buffer')
def test_buffer_with_style(self):
bg = self.geometries.buffer_with_style_geoms[0]
g = fromstr(bg.wkt)
# Can't use a floating-point for the number of quadsegs.
with self.assertRaises(ctypes.ArgumentError):
g.buffer_with_style(bg.width, quadsegs=1.1)
# Can't use a floating-point for the end cap style.
with self.assertRaises(ctypes.ArgumentError):
g.buffer_with_style(bg.width, end_cap_style=1.2)
# Can't use a end cap style that is not in the enum.
with self.assertRaises(GEOSException):
g.buffer_with_style(bg.width, end_cap_style=55)
# Can't use a floating-point for the join style.
with self.assertRaises(ctypes.ArgumentError):
g.buffer_with_style(bg.width, join_style=1.3)
# Can't use a join style that is not in the enum.
with self.assertRaises(GEOSException):
g.buffer_with_style(bg.width, join_style=66)
self._test_buffer(
itertools.chain(self.geometries.buffer_geoms, self.geometries.buffer_with_style_geoms),
'buffer_with_style',
)
def _test_buffer(self, geometries, buffer_method_name):
for bg in geometries:
g = fromstr(bg.wkt)
# The buffer we expect
exp_buf = fromstr(bg.buffer_wkt)
# Constructing our buffer
buf_kwargs = {
kwarg_name: getattr(bg, kwarg_name)
for kwarg_name in ('width', 'quadsegs', 'end_cap_style', 'join_style', 'mitre_limit')
if hasattr(bg, kwarg_name)
}
buf = getattr(g, buffer_method_name)(**buf_kwargs)
self.assertEqual(exp_buf.num_coords, buf.num_coords)
self.assertEqual(len(exp_buf), len(buf))
# Now assuring that each point in the buffer is almost equal
for j in range(len(exp_buf)):
exp_ring = exp_buf[j]
buf_ring = buf[j]
self.assertEqual(len(exp_ring), len(buf_ring))
for k in range(len(exp_ring)):
# Asserting the X, Y of each point are almost equal (due to floating point imprecision)
self.assertAlmostEqual(exp_ring[k][0], buf_ring[k][0], 9)
self.assertAlmostEqual(exp_ring[k][1], buf_ring[k][1], 9)
def test_covers(self):
poly = Polygon(((0, 0), (0, 10), (10, 10), (10, 0), (0, 0)))
self.assertTrue(poly.covers(Point(5, 5)))
self.assertFalse(poly.covers(Point(100, 100)))
def test_closed(self):
ls_closed = LineString((0, 0), (1, 1), (0, 0))
ls_not_closed = LineString((0, 0), (1, 1))
self.assertFalse(ls_not_closed.closed)
self.assertTrue(ls_closed.closed)
def test_srid(self):
"Testing the SRID property and keyword."
# Testing SRID keyword on Point
pnt = Point(5, 23, srid=4326)
self.assertEqual(4326, pnt.srid)
pnt.srid = 3084
self.assertEqual(3084, pnt.srid)
with self.assertRaises(ctypes.ArgumentError):
pnt.srid = '4326'
# Testing SRID keyword on fromstr(), and on Polygon rings.
poly = fromstr(self.geometries.polygons[1].wkt, srid=4269)
self.assertEqual(4269, poly.srid)
for ring in poly:
self.assertEqual(4269, ring.srid)
poly.srid = 4326
self.assertEqual(4326, poly.shell.srid)
# Testing SRID keyword on GeometryCollection
gc = GeometryCollection(Point(5, 23), LineString((0, 0), (1.5, 1.5), (3, 3)), srid=32021)
self.assertEqual(32021, gc.srid)
for i in range(len(gc)):
self.assertEqual(32021, gc[i].srid)
# GEOS may get the SRID from HEXEWKB
# 'POINT(5 23)' at SRID=4326 in hex form -- obtained from PostGIS
# using `SELECT GeomFromText('POINT (5 23)', 4326);`.
hex = '0101000020E610000000000000000014400000000000003740'
p1 = fromstr(hex)
self.assertEqual(4326, p1.srid)
p2 = fromstr(p1.hex)
self.assertIsNone(p2.srid)
p3 = fromstr(p1.hex, srid=-1) # -1 is intended.
self.assertEqual(-1, p3.srid)
# Testing that geometry SRID could be set to its own value
pnt_wo_srid = Point(1, 1)
pnt_wo_srid.srid = pnt_wo_srid.srid
# Input geometries that have an SRID.
self.assertEqual(GEOSGeometry(pnt.ewkt, srid=pnt.srid).srid, pnt.srid)
self.assertEqual(GEOSGeometry(pnt.ewkb, srid=pnt.srid).srid, pnt.srid)
with self.assertRaisesMessage(ValueError, 'Input geometry already has SRID: %d.' % pnt.srid):
GEOSGeometry(pnt.ewkt, srid=1)
with self.assertRaisesMessage(ValueError, 'Input geometry already has SRID: %d.' % pnt.srid):
GEOSGeometry(pnt.ewkb, srid=1)
def test_custom_srid(self):
"""Test with a null srid and a srid unknown to GDAL."""
for srid in [None, 999999]:
pnt = Point(111200, 220900, srid=srid)
self.assertTrue(pnt.ewkt.startswith(("SRID=%s;" % srid if srid else '') + "POINT (111200"))
self.assertIsInstance(pnt.ogr, gdal.OGRGeometry)
self.assertIsNone(pnt.srs)
# Test conversion from custom to a known srid
c2w = gdal.CoordTransform(
gdal.SpatialReference(
'+proj=mill +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +R_A +ellps=WGS84 '
'+datum=WGS84 +units=m +no_defs'
),
gdal.SpatialReference(4326))
new_pnt = pnt.transform(c2w, clone=True)
self.assertEqual(new_pnt.srid, 4326)
self.assertAlmostEqual(new_pnt.x, 1, 3)
self.assertAlmostEqual(new_pnt.y, 2, 3)
def test_mutable_geometries(self):
"Testing the mutability of Polygons and Geometry Collections."
# ### Testing the mutability of Polygons ###
for p in self.geometries.polygons:
poly = fromstr(p.wkt)
# Should only be able to use __setitem__ with LinearRing geometries.
with self.assertRaises(TypeError):
poly.__setitem__(0, LineString((1, 1), (2, 2)))
# Constructing the new shell by adding 500 to every point in the old shell.
shell_tup = poly.shell.tuple
new_coords = []
for point in shell_tup:
new_coords.append((point[0] + 500., point[1] + 500.))
new_shell = LinearRing(*tuple(new_coords))
# Assigning polygon's exterior ring w/the new shell
poly.exterior_ring = new_shell
str(new_shell) # new shell is still accessible
self.assertEqual(poly.exterior_ring, new_shell)
self.assertEqual(poly[0], new_shell)
# ### Testing the mutability of Geometry Collections
for tg in self.geometries.multipoints:
mp = fromstr(tg.wkt)
for i in range(len(mp)):
# Creating a random point.
pnt = mp[i]
new = Point(random.randint(21, 100), random.randint(21, 100))
# Testing the assignment
mp[i] = new
str(new) # what was used for the assignment is still accessible
self.assertEqual(mp[i], new)
self.assertEqual(mp[i].wkt, new.wkt)
self.assertNotEqual(pnt, mp[i])
# MultiPolygons involve much more memory management because each
# Polygon w/in the collection has its own rings.
for tg in self.geometries.multipolygons:
mpoly = fromstr(tg.wkt)
for i in range(len(mpoly)):
poly = mpoly[i]
old_poly = mpoly[i]
# Offsetting the each ring in the polygon by 500.
for j in range(len(poly)):
r = poly[j]
for k in range(len(r)):
r[k] = (r[k][0] + 500., r[k][1] + 500.)
poly[j] = r
self.assertNotEqual(mpoly[i], poly)
# Testing the assignment
mpoly[i] = poly
str(poly) # Still accessible
self.assertEqual(mpoly[i], poly)
self.assertNotEqual(mpoly[i], old_poly)
# Extreme (!!) __setitem__ -- no longer works, have to detect
# in the first object that __setitem__ is called in the subsequent
# objects -- maybe mpoly[0, 0, 0] = (3.14, 2.71)?
# mpoly[0][0][0] = (3.14, 2.71)
# self.assertEqual((3.14, 2.71), mpoly[0][0][0])
# Doing it more slowly..
# self.assertEqual((3.14, 2.71), mpoly[0].shell[0])
# del mpoly
def test_point_list_assignment(self):
p = Point(0, 0)
p[:] = (1, 2, 3)
self.assertEqual(p, Point(1, 2, 3))
p[:] = ()
self.assertEqual(p.wkt, Point())
p[:] = (1, 2)
self.assertEqual(p.wkt, Point(1, 2))
with self.assertRaises(ValueError):
p[:] = (1,)
with self.assertRaises(ValueError):
p[:] = (1, 2, 3, 4, 5)
def test_linestring_list_assignment(self):
ls = LineString((0, 0), (1, 1))
ls[:] = ()
self.assertEqual(ls, LineString())
ls[:] = ((0, 0), (1, 1), (2, 2))
self.assertEqual(ls, LineString((0, 0), (1, 1), (2, 2)))
with self.assertRaises(ValueError):
ls[:] = (1,)
def test_linearring_list_assignment(self):
ls = LinearRing((0, 0), (0, 1), (1, 1), (0, 0))
ls[:] = ()
self.assertEqual(ls, LinearRing())
ls[:] = ((0, 0), (0, 1), (1, 1), (1, 0), (0, 0))
self.assertEqual(ls, LinearRing((0, 0), (0, 1), (1, 1), (1, 0), (0, 0)))
with self.assertRaises(ValueError):
ls[:] = ((0, 0), (1, 1), (2, 2))
def test_polygon_list_assignment(self):
pol = Polygon()
pol[:] = (((0, 0), (0, 1), (1, 1), (1, 0), (0, 0)),)
self.assertEqual(pol, Polygon(((0, 0), (0, 1), (1, 1), (1, 0), (0, 0)),))
pol[:] = ()
self.assertEqual(pol, Polygon())
def test_geometry_collection_list_assignment(self):
p = Point()
gc = GeometryCollection()
gc[:] = [p]
self.assertEqual(gc, GeometryCollection(p))
gc[:] = ()
self.assertEqual(gc, GeometryCollection())
def test_threed(self):
"Testing three-dimensional geometries."
# Testing a 3D Point
pnt = Point(2, 3, 8)
self.assertEqual((2., 3., 8.), pnt.coords)
with self.assertRaises(TypeError):
pnt.tuple = (1., 2.)
pnt.coords = (1., 2., 3.)
self.assertEqual((1., 2., 3.), pnt.coords)
# Testing a 3D LineString
ls = LineString((2., 3., 8.), (50., 250., -117.))
self.assertEqual(((2., 3., 8.), (50., 250., -117.)), ls.tuple)
with self.assertRaises(TypeError):
ls.__setitem__(0, (1., 2.))
ls[0] = (1., 2., 3.)
self.assertEqual((1., 2., 3.), ls[0])
def test_distance(self):
"Testing the distance() function."
# Distance to self should be 0.
pnt = Point(0, 0)
self.assertEqual(0.0, pnt.distance(Point(0, 0)))
# Distance should be 1
self.assertEqual(1.0, pnt.distance(Point(0, 1)))
# Distance should be ~ sqrt(2)
self.assertAlmostEqual(1.41421356237, pnt.distance(Point(1, 1)), 11)
# Distances are from the closest vertex in each geometry --
# should be 3 (distance from (2, 2) to (5, 2)).
ls1 = LineString((0, 0), (1, 1), (2, 2))
ls2 = LineString((5, 2), (6, 1), (7, 0))
self.assertEqual(3, ls1.distance(ls2))
def test_length(self):
"Testing the length property."
# Points have 0 length.
pnt = Point(0, 0)
self.assertEqual(0.0, pnt.length)
# Should be ~ sqrt(2)
ls = LineString((0, 0), (1, 1))
self.assertAlmostEqual(1.41421356237, ls.length, 11)
# Should be circumference of Polygon
poly = Polygon(LinearRing((0, 0), (0, 1), (1, 1), (1, 0), (0, 0)))
self.assertEqual(4.0, poly.length)
# Should be sum of each element's length in collection.
mpoly = MultiPolygon(poly.clone(), poly)
self.assertEqual(8.0, mpoly.length)
def test_emptyCollections(self):
"Testing empty geometries and collections."
geoms = [
GeometryCollection([]),
fromstr('GEOMETRYCOLLECTION EMPTY'),
GeometryCollection(),
fromstr('POINT EMPTY'),
Point(),
fromstr('LINESTRING EMPTY'),
LineString(),
fromstr('POLYGON EMPTY'),
Polygon(),
fromstr('MULTILINESTRING EMPTY'),
MultiLineString(),
fromstr('MULTIPOLYGON EMPTY'),
MultiPolygon(()),
MultiPolygon(),
]
if numpy:
geoms.append(LineString(numpy.array([])))
for g in geoms:
self.assertIs(g.empty, True)
# Testing len() and num_geom.
if isinstance(g, Polygon):
self.assertEqual(1, len(g)) # Has one empty linear ring
self.assertEqual(1, g.num_geom)
self.assertEqual(0, len(g[0]))
elif isinstance(g, (Point, LineString)):
self.assertEqual(1, g.num_geom)
self.assertEqual(0, len(g))
else:
self.assertEqual(0, g.num_geom)
self.assertEqual(0, len(g))
# Testing __getitem__ (doesn't work on Point or Polygon)
if isinstance(g, Point):
with self.assertRaises(IndexError):
g.x
elif isinstance(g, Polygon):
lr = g.shell
self.assertEqual('LINEARRING EMPTY', lr.wkt)
self.assertEqual(0, len(lr))
self.assertIs(lr.empty, True)
with self.assertRaises(IndexError):
lr.__getitem__(0)
else:
with self.assertRaises(IndexError):
g.__getitem__(0)
def test_collection_dims(self):
gc = GeometryCollection([])
self.assertEqual(gc.dims, -1)
gc = GeometryCollection(Point(0, 0))
self.assertEqual(gc.dims, 0)
gc = GeometryCollection(LineString((0, 0), (1, 1)), Point(0, 0))
self.assertEqual(gc.dims, 1)
gc = GeometryCollection(LineString((0, 0), (1, 1)), Polygon(((0, 0), (0, 1), (1, 1), (0, 0))), Point(0, 0))
self.assertEqual(gc.dims, 2)
def test_collections_of_collections(self):
"Testing GeometryCollection handling of other collections."
# Creating a GeometryCollection WKT string composed of other
# collections and polygons.
coll = [mp.wkt for mp in self.geometries.multipolygons if mp.valid]
coll.extend(mls.wkt for mls in self.geometries.multilinestrings)
coll.extend(p.wkt for p in self.geometries.polygons)
coll.extend(mp.wkt for mp in self.geometries.multipoints)
gc_wkt = 'GEOMETRYCOLLECTION(%s)' % ','.join(coll)
# Should construct ok from WKT
gc1 = GEOSGeometry(gc_wkt)
# Should also construct ok from individual geometry arguments.
gc2 = GeometryCollection(*tuple(g for g in gc1))
# And, they should be equal.
self.assertEqual(gc1, gc2)
def test_gdal(self):
"Testing `ogr` and `srs` properties."
g1 = fromstr('POINT(5 23)')
self.assertIsInstance(g1.ogr, gdal.OGRGeometry)
self.assertIsNone(g1.srs)
g1_3d = fromstr('POINT(5 23 8)')
self.assertIsInstance(g1_3d.ogr, gdal.OGRGeometry)
self.assertEqual(g1_3d.ogr.z, 8)
g2 = fromstr('LINESTRING(0 0, 5 5, 23 23)', srid=4326)
self.assertIsInstance(g2.ogr, gdal.OGRGeometry)
self.assertIsInstance(g2.srs, gdal.SpatialReference)
self.assertEqual(g2.hex, g2.ogr.hex)
self.assertEqual('WGS 84', g2.srs.name)
def test_copy(self):
"Testing use with the Python `copy` module."
import copy
poly = GEOSGeometry('POLYGON((0 0, 0 23, 23 23, 23 0, 0 0), (5 5, 5 10, 10 10, 10 5, 5 5))')
cpy1 = copy.copy(poly)
cpy2 = copy.deepcopy(poly)
self.assertNotEqual(poly._ptr, cpy1._ptr)
self.assertNotEqual(poly._ptr, cpy2._ptr)
def test_transform(self):
"Testing `transform` method."
orig = GEOSGeometry('POINT (-104.609 38.255)', 4326)
trans = GEOSGeometry('POINT (992385.4472045 481455.4944650)', 2774)
# Using a srid, a SpatialReference object, and a CoordTransform object
# for transformations.
t1, t2, t3 = orig.clone(), orig.clone(), orig.clone()
t1.transform(trans.srid)
t2.transform(gdal.SpatialReference('EPSG:2774'))
ct = gdal.CoordTransform(gdal.SpatialReference('WGS84'), gdal.SpatialReference(2774))
t3.transform(ct)
# Testing use of the `clone` keyword.
k1 = orig.clone()
k2 = k1.transform(trans.srid, clone=True)
self.assertEqual(k1, orig)
self.assertNotEqual(k1, k2)
prec = 3
for p in (t1, t2, t3, k2):
self.assertAlmostEqual(trans.x, p.x, prec)
self.assertAlmostEqual(trans.y, p.y, prec)
def test_transform_3d(self):
p3d = GEOSGeometry('POINT (5 23 100)', 4326)
p3d.transform(2774)
self.assertAlmostEqual(p3d.z, 100, 3)
def test_transform_noop(self):
""" Testing `transform` method (SRID match) """
# transform() should no-op if source & dest SRIDs match,
# regardless of whether GDAL is available.
g = GEOSGeometry('POINT (-104.609 38.255)', 4326)
gt = g.tuple
g.transform(4326)
self.assertEqual(g.tuple, gt)
self.assertEqual(g.srid, 4326)
g = GEOSGeometry('POINT (-104.609 38.255)', 4326)
g1 = g.transform(4326, clone=True)
self.assertEqual(g1.tuple, g.tuple)
self.assertEqual(g1.srid, 4326)
self.assertIsNot(g1, g, "Clone didn't happen")
def test_transform_nosrid(self):
""" Testing `transform` method (no SRID or negative SRID) """
g = GEOSGeometry('POINT (-104.609 38.255)', srid=None)
with self.assertRaises(GEOSException):
g.transform(2774)
g = GEOSGeometry('POINT (-104.609 38.255)', srid=None)
with self.assertRaises(GEOSException):
g.transform(2774, clone=True)
g = GEOSGeometry('POINT (-104.609 38.255)', srid=-1)
with self.assertRaises(GEOSException):
g.transform(2774)
g = GEOSGeometry('POINT (-104.609 38.255)', srid=-1)
with self.assertRaises(GEOSException):
g.transform(2774, clone=True)
def test_extent(self):
"Testing `extent` method."
# The xmin, ymin, xmax, ymax of the MultiPoint should be returned.
mp = MultiPoint(Point(5, 23), Point(0, 0), Point(10, 50))
self.assertEqual((0.0, 0.0, 10.0, 50.0), mp.extent)
pnt = Point(5.23, 17.8)
# Extent of points is just the point itself repeated.
self.assertEqual((5.23, 17.8, 5.23, 17.8), pnt.extent)
# Testing on the 'real world' Polygon.
poly = fromstr(self.geometries.polygons[3].wkt)
ring = poly.shell
x, y = ring.x, ring.y
xmin, ymin = min(x), min(y)
xmax, ymax = max(x), max(y)
self.assertEqual((xmin, ymin, xmax, ymax), poly.extent)
def test_pickle(self):
"Testing pickling and unpickling support."
# Creating a list of test geometries for pickling,
# and setting the SRID on some of them.
def get_geoms(lst, srid=None):
return [GEOSGeometry(tg.wkt, srid) for tg in lst]
tgeoms = get_geoms(self.geometries.points)
tgeoms.extend(get_geoms(self.geometries.multilinestrings, 4326))
tgeoms.extend(get_geoms(self.geometries.polygons, 3084))
tgeoms.extend(get_geoms(self.geometries.multipolygons, 3857))
tgeoms.append(Point(srid=4326))
tgeoms.append(Point())
for geom in tgeoms:
s1 = pickle.dumps(geom)
g1 = pickle.loads(s1)
self.assertEqual(geom, g1)
self.assertEqual(geom.srid, g1.srid)
def test_prepared(self):
"Testing PreparedGeometry support."
# Creating a simple multipolygon and getting a prepared version.
mpoly = GEOSGeometry('MULTIPOLYGON(((0 0,0 5,5 5,5 0,0 0)),((5 5,5 10,10 10,10 5,5 5)))')
prep = mpoly.prepared
# A set of test points.
pnts = [Point(5, 5), Point(7.5, 7.5), Point(2.5, 7.5)]
for pnt in pnts:
# Results should be the same (but faster)
self.assertEqual(mpoly.contains(pnt), prep.contains(pnt))
self.assertEqual(mpoly.intersects(pnt), prep.intersects(pnt))
self.assertEqual(mpoly.covers(pnt), prep.covers(pnt))
self.assertTrue(prep.crosses(fromstr('LINESTRING(1 1, 15 15)')))
self.assertTrue(prep.disjoint(Point(-5, -5)))
poly = Polygon(((-1, -1), (1, 1), (1, 0), (-1, -1)))
self.assertTrue(prep.overlaps(poly))
poly = Polygon(((-5, 0), (-5, 5), (0, 5), (-5, 0)))
self.assertTrue(prep.touches(poly))
poly = Polygon(((-1, -1), (-1, 11), (11, 11), (11, -1), (-1, -1)))
self.assertTrue(prep.within(poly))
# Original geometry deletion should not crash the prepared one (#21662)
del mpoly
self.assertTrue(prep.covers(Point(5, 5)))
def test_line_merge(self):
"Testing line merge support"
ref_geoms = (fromstr('LINESTRING(1 1, 1 1, 3 3)'),
fromstr('MULTILINESTRING((1 1, 3 3), (3 3, 4 2))'),
)
ref_merged = (fromstr('LINESTRING(1 1, 3 3)'),
fromstr('LINESTRING (1 1, 3 3, 4 2)'),
)
for geom, merged in zip(ref_geoms, ref_merged):
self.assertEqual(merged, geom.merged)
def test_valid_reason(self):
"Testing IsValidReason support"
g = GEOSGeometry("POINT(0 0)")
self.assertTrue(g.valid)
self.assertIsInstance(g.valid_reason, str)
self.assertEqual(g.valid_reason, "Valid Geometry")
g = GEOSGeometry("LINESTRING(0 0, 0 0)")
self.assertFalse(g.valid)
self.assertIsInstance(g.valid_reason, str)
self.assertTrue(g.valid_reason.startswith("Too few points in geometry component"))
def test_linearref(self):
"Testing linear referencing"
ls = fromstr('LINESTRING(0 0, 0 10, 10 10, 10 0)')
mls = fromstr('MULTILINESTRING((0 0, 0 10), (10 0, 10 10))')
self.assertEqual(ls.project(Point(0, 20)), 10.0)
self.assertEqual(ls.project(Point(7, 6)), 24)
self.assertEqual(ls.project_normalized(Point(0, 20)), 1.0 / 3)
self.assertEqual(ls.interpolate(10), Point(0, 10))
self.assertEqual(ls.interpolate(24), Point(10, 6))
self.assertEqual(ls.interpolate_normalized(1.0 / 3), Point(0, 10))
self.assertEqual(mls.project(Point(0, 20)), 10)
self.assertEqual(mls.project(Point(7, 6)), 16)
self.assertEqual(mls.interpolate(9), Point(0, 9))
self.assertEqual(mls.interpolate(17), Point(10, 7))
def test_deconstructible(self):
"""
Geometry classes should be deconstructible.
"""
point = Point(4.337844, 50.827537, srid=4326)
path, args, kwargs = point.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.point.Point')
self.assertEqual(args, (4.337844, 50.827537))
self.assertEqual(kwargs, {'srid': 4326})
ls = LineString(((0, 0), (1, 1)))
path, args, kwargs = ls.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.linestring.LineString')
self.assertEqual(args, (((0, 0), (1, 1)),))
self.assertEqual(kwargs, {})
ls2 = LineString([Point(0, 0), Point(1, 1)], srid=4326)
path, args, kwargs = ls2.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.linestring.LineString')
self.assertEqual(args, ([Point(0, 0), Point(1, 1)],))
self.assertEqual(kwargs, {'srid': 4326})
ext_coords = ((0, 0), (0, 1), (1, 1), (1, 0), (0, 0))
int_coords = ((0.4, 0.4), (0.4, 0.6), (0.6, 0.6), (0.6, 0.4), (0.4, 0.4))
poly = Polygon(ext_coords, int_coords)
path, args, kwargs = poly.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.polygon.Polygon')
self.assertEqual(args, (ext_coords, int_coords))
self.assertEqual(kwargs, {})
lr = LinearRing((0, 0), (0, 1), (1, 1), (0, 0))
path, args, kwargs = lr.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.linestring.LinearRing')
self.assertEqual(args, ((0, 0), (0, 1), (1, 1), (0, 0)))
self.assertEqual(kwargs, {})
mp = MultiPoint(Point(0, 0), Point(1, 1))
path, args, kwargs = mp.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.collections.MultiPoint')
self.assertEqual(args, (Point(0, 0), Point(1, 1)))
self.assertEqual(kwargs, {})
ls1 = LineString((0, 0), (1, 1))
ls2 = LineString((2, 2), (3, 3))
mls = MultiLineString(ls1, ls2)
path, args, kwargs = mls.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.collections.MultiLineString')
self.assertEqual(args, (ls1, ls2))
self.assertEqual(kwargs, {})
p1 = Polygon(((0, 0), (0, 1), (1, 1), (0, 0)))
p2 = Polygon(((1, 1), (1, 2), (2, 2), (1, 1)))
mp = MultiPolygon(p1, p2)
path, args, kwargs = mp.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.collections.MultiPolygon')
self.assertEqual(args, (p1, p2))
self.assertEqual(kwargs, {})
poly = Polygon(((0, 0), (0, 1), (1, 1), (0, 0)))
gc = GeometryCollection(Point(0, 0), MultiPoint(Point(0, 0), Point(1, 1)), poly)
path, args, kwargs = gc.deconstruct()
self.assertEqual(path, 'django.contrib.gis.geos.collections.GeometryCollection')
self.assertEqual(args, (Point(0, 0), MultiPoint(Point(0, 0), Point(1, 1)), poly))
self.assertEqual(kwargs, {})
def test_subclassing(self):
"""
GEOSGeometry subclass may itself be subclassed without being forced-cast
to the parent class during `__init__`.
"""
class ExtendedPolygon(Polygon):
def __init__(self, *args, data=0, **kwargs):
super().__init__(*args, **kwargs)
self._data = data
def __str__(self):
return "EXT_POLYGON - data: %d - %s" % (self._data, self.wkt)
ext_poly = ExtendedPolygon(((0, 0), (0, 1), (1, 1), (0, 0)), data=3)
self.assertEqual(type(ext_poly), ExtendedPolygon)
# ExtendedPolygon.__str__ should be called (instead of Polygon.__str__).
self.assertEqual(str(ext_poly), "EXT_POLYGON - data: 3 - POLYGON ((0 0, 0 1, 1 1, 0 0))")
self.assertJSONEqual(
ext_poly.json,
'{"coordinates": [[[0, 0], [0, 1], [1, 1], [0, 0]]], "type": "Polygon"}',
)
def test_geos_version_tuple(self):
versions = (
(b'3.0.0rc4-CAPI-1.3.3', (3, 0, 0)),
(b'3.0.0-CAPI-1.4.1', (3, 0, 0)),
(b'3.4.0dev-CAPI-1.8.0', (3, 4, 0)),
(b'3.4.0dev-CAPI-1.8.0 r0', (3, 4, 0)),
(b'3.6.2-CAPI-1.10.2 4d2925d6', (3, 6, 2)),
)
for version_string, version_tuple in versions:
with self.subTest(version_string=version_string):
with mock.patch('django.contrib.gis.geos.libgeos.geos_version', lambda: version_string):
self.assertEqual(geos_version_tuple(), version_tuple)
def test_from_gml(self):
self.assertEqual(
GEOSGeometry('POINT(0 0)'),
GEOSGeometry.from_gml(
'<gml:Point gml:id="p21" srsName="http://www.opengis.net/def/crs/EPSG/0/4326">'
' <gml:pos srsDimension="2">0 0</gml:pos>'
'</gml:Point>'
),
)
def test_from_ewkt(self):
self.assertEqual(GEOSGeometry.from_ewkt('SRID=1;POINT(1 1)'), Point(1, 1, srid=1))
self.assertEqual(GEOSGeometry.from_ewkt('POINT(1 1)'), Point(1, 1))
def test_from_ewkt_empty_string(self):
msg = 'Expected WKT but got an empty string.'
with self.assertRaisesMessage(ValueError, msg):
GEOSGeometry.from_ewkt('')
with self.assertRaisesMessage(ValueError, msg):
GEOSGeometry.from_ewkt('SRID=1;')
def test_from_ewkt_invalid_srid(self):
msg = 'EWKT has invalid SRID part.'
with self.assertRaisesMessage(ValueError, msg):
GEOSGeometry.from_ewkt('SRUD=1;POINT(1 1)')
with self.assertRaisesMessage(ValueError, msg):
GEOSGeometry.from_ewkt('SRID=WGS84;POINT(1 1)')
def test_fromstr_scientific_wkt(self):
self.assertEqual(GEOSGeometry('POINT(1.0e-1 1.0e+1)'), Point(.1, 10))
def test_normalize(self):
g = MultiPoint(Point(0, 0), Point(2, 2), Point(1, 1))
self.assertIsNone(g.normalize())
self.assertTrue(g.equals_exact(MultiPoint(Point(2, 2), Point(1, 1), Point(0, 0))))
def test_empty_point(self):
p = Point(srid=4326)
self.assertEqual(p.ogr.ewkt, p.ewkt)
self.assertEqual(p.transform(2774, clone=True), Point(srid=2774))
p.transform(2774)
self.assertEqual(p, Point(srid=2774))
def test_linestring_iter(self):
ls = LineString((0, 0), (1, 1))
it = iter(ls)
# Step into CoordSeq iterator.
next(it)
ls[:] = []
with self.assertRaises(IndexError):
next(it)
|
21ea2a386fd56fb83be91b4d1db36758e45e3034e651af9310aedde13b714e9f | import os
import shutil
import struct
import tempfile
from django.contrib.gis.gdal import GDAL_VERSION, GDALRaster
from django.contrib.gis.gdal.error import GDALException
from django.contrib.gis.gdal.raster.band import GDALBand
from django.contrib.gis.shortcuts import numpy
from django.test import SimpleTestCase
from ..data.rasters.textrasters import JSON_RASTER
class GDALRasterTests(SimpleTestCase):
"""
Test a GDALRaster instance created from a file (GeoTiff).
"""
def setUp(self):
self.rs_path = os.path.join(os.path.dirname(__file__), '../data/rasters/raster.tif')
self.rs = GDALRaster(self.rs_path)
def test_rs_name_repr(self):
self.assertEqual(self.rs_path, self.rs.name)
self.assertRegex(repr(self.rs), r"<Raster object at 0x\w+>")
def test_rs_driver(self):
self.assertEqual(self.rs.driver.name, 'GTiff')
def test_rs_size(self):
self.assertEqual(self.rs.width, 163)
self.assertEqual(self.rs.height, 174)
def test_rs_srs(self):
self.assertEqual(self.rs.srs.srid, 3086)
self.assertEqual(self.rs.srs.units, (1.0, 'metre'))
def test_rs_srid(self):
rast = GDALRaster({
'width': 16,
'height': 16,
'srid': 4326,
})
self.assertEqual(rast.srid, 4326)
rast.srid = 3086
self.assertEqual(rast.srid, 3086)
def test_geotransform_and_friends(self):
# Assert correct values for file based raster
self.assertEqual(
self.rs.geotransform,
[511700.4680706557, 100.0, 0.0, 435103.3771231986, 0.0, -100.0]
)
self.assertEqual(self.rs.origin, [511700.4680706557, 435103.3771231986])
self.assertEqual(self.rs.origin.x, 511700.4680706557)
self.assertEqual(self.rs.origin.y, 435103.3771231986)
self.assertEqual(self.rs.scale, [100.0, -100.0])
self.assertEqual(self.rs.scale.x, 100.0)
self.assertEqual(self.rs.scale.y, -100.0)
self.assertEqual(self.rs.skew, [0, 0])
self.assertEqual(self.rs.skew.x, 0)
self.assertEqual(self.rs.skew.y, 0)
# Create in-memory rasters and change gtvalues
rsmem = GDALRaster(JSON_RASTER)
# geotransform accepts both floats and ints
rsmem.geotransform = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0]
self.assertEqual(rsmem.geotransform, [0.0, 1.0, 2.0, 3.0, 4.0, 5.0])
rsmem.geotransform = range(6)
self.assertEqual(rsmem.geotransform, [float(x) for x in range(6)])
self.assertEqual(rsmem.origin, [0, 3])
self.assertEqual(rsmem.origin.x, 0)
self.assertEqual(rsmem.origin.y, 3)
self.assertEqual(rsmem.scale, [1, 5])
self.assertEqual(rsmem.scale.x, 1)
self.assertEqual(rsmem.scale.y, 5)
self.assertEqual(rsmem.skew, [2, 4])
self.assertEqual(rsmem.skew.x, 2)
self.assertEqual(rsmem.skew.y, 4)
self.assertEqual(rsmem.width, 5)
self.assertEqual(rsmem.height, 5)
def test_geotransform_bad_inputs(self):
rsmem = GDALRaster(JSON_RASTER)
error_geotransforms = [
[1, 2],
[1, 2, 3, 4, 5, 'foo'],
[1, 2, 3, 4, 5, 6, 'foo'],
]
msg = 'Geotransform must consist of 6 numeric values.'
for geotransform in error_geotransforms:
with self.subTest(i=geotransform), self.assertRaisesMessage(ValueError, msg):
rsmem.geotransform = geotransform
def test_rs_extent(self):
self.assertEqual(
self.rs.extent,
(511700.4680706557, 417703.3771231986, 528000.4680706557, 435103.3771231986)
)
def test_rs_bands(self):
self.assertEqual(len(self.rs.bands), 1)
self.assertIsInstance(self.rs.bands[0], GDALBand)
def test_memory_based_raster_creation(self):
# Create uint8 raster with full pixel data range (0-255)
rast = GDALRaster({
'datatype': 1,
'width': 16,
'height': 16,
'srid': 4326,
'bands': [{
'data': range(256),
'nodata_value': 255,
}],
})
# Get array from raster
result = rast.bands[0].data()
if numpy:
result = result.flatten().tolist()
# Assert data is same as original input
self.assertEqual(result, list(range(256)))
def test_file_based_raster_creation(self):
# Prepare tempfile
rstfile = tempfile.NamedTemporaryFile(suffix='.tif')
# Create file-based raster from scratch
GDALRaster({
'datatype': self.rs.bands[0].datatype(),
'driver': 'tif',
'name': rstfile.name,
'width': 163,
'height': 174,
'nr_of_bands': 1,
'srid': self.rs.srs.wkt,
'origin': (self.rs.origin.x, self.rs.origin.y),
'scale': (self.rs.scale.x, self.rs.scale.y),
'skew': (self.rs.skew.x, self.rs.skew.y),
'bands': [{
'data': self.rs.bands[0].data(),
'nodata_value': self.rs.bands[0].nodata_value,
}],
})
# Reload newly created raster from file
restored_raster = GDALRaster(rstfile.name)
self.assertEqual(restored_raster.srs.wkt, self.rs.srs.wkt)
self.assertEqual(restored_raster.geotransform, self.rs.geotransform)
if numpy:
numpy.testing.assert_equal(
restored_raster.bands[0].data(),
self.rs.bands[0].data()
)
else:
self.assertEqual(restored_raster.bands[0].data(), self.rs.bands[0].data())
def test_nonexistent_file(self):
msg = 'Unable to read raster source input "nonexistent.tif".'
with self.assertRaisesMessage(GDALException, msg):
GDALRaster('nonexistent.tif')
def test_vsi_raster_creation(self):
# Open a raster as a file object.
with open(self.rs_path, 'rb') as dat:
# Instantiate a raster from the file binary buffer.
vsimem = GDALRaster(dat.read())
# The data of the in-memory file is equal to the source file.
result = vsimem.bands[0].data()
target = self.rs.bands[0].data()
if numpy:
result = result.flatten().tolist()
target = target.flatten().tolist()
self.assertEqual(result, target)
def test_vsi_raster_deletion(self):
path = '/vsimem/raster.tif'
# Create a vsi-based raster from scratch.
vsimem = GDALRaster({
'name': path,
'driver': 'tif',
'width': 4,
'height': 4,
'srid': 4326,
'bands': [{
'data': range(16),
}],
})
# The virtual file exists.
rst = GDALRaster(path)
self.assertEqual(rst.width, 4)
# Delete GDALRaster.
del vsimem
del rst
# The virtual file has been removed.
msg = 'Could not open the datasource at "/vsimem/raster.tif"'
with self.assertRaisesMessage(GDALException, msg):
GDALRaster(path)
def test_vsi_invalid_buffer_error(self):
msg = 'Failed creating VSI raster from the input buffer.'
with self.assertRaisesMessage(GDALException, msg):
GDALRaster(b'not-a-raster-buffer')
def test_vsi_buffer_property(self):
# Create a vsi-based raster from scratch.
rast = GDALRaster({
'name': '/vsimem/raster.tif',
'driver': 'tif',
'width': 4,
'height': 4,
'srid': 4326,
'bands': [{
'data': range(16),
}],
})
# Do a round trip from raster to buffer to raster.
result = GDALRaster(rast.vsi_buffer).bands[0].data()
if numpy:
result = result.flatten().tolist()
# Band data is equal to nodata value except on input block of ones.
self.assertEqual(result, list(range(16)))
# The vsi buffer is None for rasters that are not vsi based.
self.assertIsNone(self.rs.vsi_buffer)
def test_offset_size_and_shape_on_raster_creation(self):
rast = GDALRaster({
'datatype': 1,
'width': 4,
'height': 4,
'srid': 4326,
'bands': [{
'data': (1,),
'offset': (1, 1),
'size': (2, 2),
'shape': (1, 1),
'nodata_value': 2,
}],
})
# Get array from raster.
result = rast.bands[0].data()
if numpy:
result = result.flatten().tolist()
# Band data is equal to nodata value except on input block of ones.
self.assertEqual(
result,
[2, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 2, 2, 2]
)
def test_set_nodata_value_on_raster_creation(self):
# Create raster filled with nodata values.
rast = GDALRaster({
'datatype': 1,
'width': 2,
'height': 2,
'srid': 4326,
'bands': [{'nodata_value': 23}],
})
# Get array from raster.
result = rast.bands[0].data()
if numpy:
result = result.flatten().tolist()
# All band data is equal to nodata value.
self.assertEqual(result, [23] * 4)
def test_set_nodata_none_on_raster_creation(self):
if GDAL_VERSION < (2, 1):
self.skipTest("GDAL >= 2.1 is required for this test.")
# Create raster without data and without nodata value.
rast = GDALRaster({
'datatype': 1,
'width': 2,
'height': 2,
'srid': 4326,
'bands': [{'nodata_value': None}],
})
# Get array from raster.
result = rast.bands[0].data()
if numpy:
result = result.flatten().tolist()
# Band data is equal to zero because no nodata value has been specified.
self.assertEqual(result, [0] * 4)
def test_raster_metadata_property(self):
data = self.rs.metadata
self.assertEqual(data['DEFAULT'], {'AREA_OR_POINT': 'Area'})
self.assertEqual(data['IMAGE_STRUCTURE'], {'INTERLEAVE': 'BAND'})
# Create file-based raster from scratch
source = GDALRaster({
'datatype': 1,
'width': 2,
'height': 2,
'srid': 4326,
'bands': [{'data': range(4), 'nodata_value': 99}],
})
# Set metadata on raster and on a band.
metadata = {
'DEFAULT': {'OWNER': 'Django', 'VERSION': '1.0', 'AREA_OR_POINT': 'Point'},
}
source.metadata = metadata
source.bands[0].metadata = metadata
self.assertEqual(source.metadata['DEFAULT'], metadata['DEFAULT'])
self.assertEqual(source.bands[0].metadata['DEFAULT'], metadata['DEFAULT'])
# Update metadata on raster.
metadata = {
'DEFAULT': {'VERSION': '2.0'},
}
source.metadata = metadata
self.assertEqual(source.metadata['DEFAULT']['VERSION'], '2.0')
# Remove metadata on raster.
metadata = {
'DEFAULT': {'OWNER': None},
}
source.metadata = metadata
self.assertNotIn('OWNER', source.metadata['DEFAULT'])
def test_raster_info_accessor(self):
if GDAL_VERSION < (2, 1):
msg = 'GDAL ≥ 2.1 is required for using the info property.'
with self.assertRaisesMessage(ValueError, msg):
self.rs.info
return
gdalinfo = """
Driver: GTiff/GeoTIFF
Files: {}
Size is 163, 174
Coordinate System is:
PROJCS["NAD83 / Florida GDL Albers",
GEOGCS["NAD83",
DATUM["North_American_Datum_1983",
SPHEROID["GRS 1980",6378137,298.257222101,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,
AUTHORITY["EPSG","9122"]],
AUTHORITY["EPSG","4269"]],
PROJECTION["Albers_Conic_Equal_Area"],
PARAMETER["standard_parallel_1",24],
PARAMETER["standard_parallel_2",31.5],
PARAMETER["latitude_of_center",24],
PARAMETER["longitude_of_center",-84],
PARAMETER["false_easting",400000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AXIS["X",EAST],
AXIS["Y",NORTH],
AUTHORITY["EPSG","3086"]]
Origin = (511700.468070655711927,435103.377123198588379)
Pixel Size = (100.000000000000000,-100.000000000000000)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 511700.468, 435103.377) ( 82d51'46.16"W, 27d55' 1.53"N)
Lower Left ( 511700.468, 417703.377) ( 82d51'52.04"W, 27d45'37.50"N)
Upper Right ( 528000.468, 435103.377) ( 82d41'48.81"W, 27d54'56.30"N)
Lower Right ( 528000.468, 417703.377) ( 82d41'55.54"W, 27d45'32.28"N)
Center ( 519850.468, 426403.377) ( 82d46'50.64"W, 27d50'16.99"N)
Band 1 Block=163x50 Type=Byte, ColorInterp=Gray
NoData Value=15
""".format(self.rs_path)
# Data
info_dyn = [line.strip() for line in self.rs.info.split('\n') if line.strip() != '']
info_ref = [line.strip() for line in gdalinfo.split('\n') if line.strip() != '']
self.assertEqual(info_dyn, info_ref)
def test_compressed_file_based_raster_creation(self):
rstfile = tempfile.NamedTemporaryFile(suffix='.tif')
# Make a compressed copy of an existing raster.
compressed = self.rs.warp({'papsz_options': {'compress': 'packbits'}, 'name': rstfile.name})
# Check physically if compression worked.
self.assertLess(os.path.getsize(compressed.name), os.path.getsize(self.rs.name))
# Create file-based raster with options from scratch.
compressed = GDALRaster({
'datatype': 1,
'driver': 'tif',
'name': rstfile.name,
'width': 40,
'height': 40,
'srid': 3086,
'origin': (500000, 400000),
'scale': (100, -100),
'skew': (0, 0),
'bands': [{
'data': range(40 ^ 2),
'nodata_value': 255,
}],
'papsz_options': {
'compress': 'packbits',
'pixeltype': 'signedbyte',
'blockxsize': 23,
'blockysize': 23,
}
})
# Check if options used on creation are stored in metadata.
# Reopening the raster ensures that all metadata has been written
# to the file.
compressed = GDALRaster(compressed.name)
self.assertEqual(compressed.metadata['IMAGE_STRUCTURE']['COMPRESSION'], 'PACKBITS',)
self.assertEqual(compressed.bands[0].metadata['IMAGE_STRUCTURE']['PIXELTYPE'], 'SIGNEDBYTE')
if GDAL_VERSION >= (2, 1):
self.assertIn('Block=40x23', compressed.info)
def test_raster_warp(self):
# Create in memory raster
source = GDALRaster({
'datatype': 1,
'driver': 'MEM',
'name': 'sourceraster',
'width': 4,
'height': 4,
'nr_of_bands': 1,
'srid': 3086,
'origin': (500000, 400000),
'scale': (100, -100),
'skew': (0, 0),
'bands': [{
'data': range(16),
'nodata_value': 255,
}],
})
# Test altering the scale, width, and height of a raster
data = {
'scale': [200, -200],
'width': 2,
'height': 2,
}
target = source.warp(data)
self.assertEqual(target.width, data['width'])
self.assertEqual(target.height, data['height'])
self.assertEqual(target.scale, data['scale'])
self.assertEqual(target.bands[0].datatype(), source.bands[0].datatype())
self.assertEqual(target.name, 'sourceraster_copy.MEM')
result = target.bands[0].data()
if numpy:
result = result.flatten().tolist()
self.assertEqual(result, [5, 7, 13, 15])
# Test altering the name and datatype (to float)
data = {
'name': '/path/to/targetraster.tif',
'datatype': 6,
}
target = source.warp(data)
self.assertEqual(target.bands[0].datatype(), 6)
self.assertEqual(target.name, '/path/to/targetraster.tif')
self.assertEqual(target.driver.name, 'MEM')
result = target.bands[0].data()
if numpy:
result = result.flatten().tolist()
self.assertEqual(
result,
[0.0, 1.0, 2.0, 3.0,
4.0, 5.0, 6.0, 7.0,
8.0, 9.0, 10.0, 11.0,
12.0, 13.0, 14.0, 15.0]
)
def test_raster_warp_nodata_zone(self):
# Create in memory raster.
source = GDALRaster({
'datatype': 1,
'driver': 'MEM',
'width': 4,
'height': 4,
'srid': 3086,
'origin': (500000, 400000),
'scale': (100, -100),
'skew': (0, 0),
'bands': [{
'data': range(16),
'nodata_value': 23,
}],
})
# Warp raster onto a location that does not cover any pixels of the original.
result = source.warp({'origin': (200000, 200000)}).bands[0].data()
if numpy:
result = result.flatten().tolist()
# The result is an empty raster filled with the correct nodata value.
self.assertEqual(result, [23] * 16)
def test_raster_transform(self):
# Prepare tempfile and nodata value
rstfile = tempfile.NamedTemporaryFile(suffix='.tif')
ndv = 99
# Create in file based raster
source = GDALRaster({
'datatype': 1,
'driver': 'tif',
'name': rstfile.name,
'width': 5,
'height': 5,
'nr_of_bands': 1,
'srid': 4326,
'origin': (-5, 5),
'scale': (2, -2),
'skew': (0, 0),
'bands': [{
'data': range(25),
'nodata_value': ndv,
}],
})
# Transform raster into srid 4326.
target = source.transform(3086)
# Reload data from disk
target = GDALRaster(target.name)
self.assertEqual(target.srs.srid, 3086)
self.assertEqual(target.width, 7)
self.assertEqual(target.height, 7)
self.assertEqual(target.bands[0].datatype(), source.bands[0].datatype())
self.assertAlmostEqual(target.origin[0], 9124842.791079799, 3)
self.assertAlmostEqual(target.origin[1], 1589911.6476407414, 3)
self.assertAlmostEqual(target.scale[0], 223824.82664250192, 3)
self.assertAlmostEqual(target.scale[1], -223824.82664250192, 3)
self.assertEqual(target.skew, [0, 0])
result = target.bands[0].data()
if numpy:
result = result.flatten().tolist()
# The reprojection of a raster that spans over a large area
# skews the data matrix and might introduce nodata values.
self.assertEqual(
result,
[
ndv, ndv, ndv, ndv, 4, ndv, ndv,
ndv, ndv, 2, 3, 9, ndv, ndv,
ndv, 1, 2, 8, 13, 19, ndv,
0, 6, 6, 12, 18, 18, 24,
ndv, 10, 11, 16, 22, 23, ndv,
ndv, ndv, 15, 21, 22, ndv, ndv,
ndv, ndv, 20, ndv, ndv, ndv, ndv,
]
)
class GDALBandTests(SimpleTestCase):
rs_path = os.path.join(os.path.dirname(__file__), '../data/rasters/raster.tif')
def test_band_data(self):
rs = GDALRaster(self.rs_path)
band = rs.bands[0]
self.assertEqual(band.width, 163)
self.assertEqual(band.height, 174)
self.assertEqual(band.description, '')
self.assertEqual(band.datatype(), 1)
self.assertEqual(band.datatype(as_string=True), 'GDT_Byte')
self.assertEqual(band.color_interp(), 1)
self.assertEqual(band.color_interp(as_string=True), 'GCI_GrayIndex')
self.assertEqual(band.nodata_value, 15)
if numpy:
data = band.data()
assert_array = numpy.loadtxt(
os.path.join(os.path.dirname(__file__), '../data/rasters/raster.numpy.txt')
)
numpy.testing.assert_equal(data, assert_array)
self.assertEqual(data.shape, (band.height, band.width))
def test_band_statistics(self):
with tempfile.TemporaryDirectory() as tmp_dir:
rs_path = os.path.join(tmp_dir, 'raster.tif')
shutil.copyfile(self.rs_path, rs_path)
rs = GDALRaster(rs_path)
band = rs.bands[0]
pam_file = rs_path + '.aux.xml'
smin, smax, smean, sstd = band.statistics(approximate=True)
self.assertEqual(smin, 0)
self.assertEqual(smax, 9)
self.assertAlmostEqual(smean, 2.842331288343558)
self.assertAlmostEqual(sstd, 2.3965567248965356)
smin, smax, smean, sstd = band.statistics(approximate=False, refresh=True)
self.assertEqual(smin, 0)
self.assertEqual(smax, 9)
self.assertAlmostEqual(smean, 2.828326634228898)
self.assertAlmostEqual(sstd, 2.4260526986669095)
self.assertEqual(band.min, 0)
self.assertEqual(band.max, 9)
self.assertAlmostEqual(band.mean, 2.828326634228898)
self.assertAlmostEqual(band.std, 2.4260526986669095)
# Statistics are persisted into PAM file on band close
rs = band = None
self.assertTrue(os.path.isfile(pam_file))
def test_read_mode_error(self):
# Open raster in read mode
rs = GDALRaster(self.rs_path, write=False)
band = rs.bands[0]
# Setting attributes in write mode raises exception in the _flush method
with self.assertRaises(GDALException):
setattr(band, 'nodata_value', 10)
def test_band_data_setters(self):
# Create in-memory raster and get band
rsmem = GDALRaster({
'datatype': 1,
'driver': 'MEM',
'name': 'mem_rst',
'width': 10,
'height': 10,
'nr_of_bands': 1,
'srid': 4326,
})
bandmem = rsmem.bands[0]
# Set nodata value
bandmem.nodata_value = 99
self.assertEqual(bandmem.nodata_value, 99)
# Set data for entire dataset
bandmem.data(range(100))
if numpy:
numpy.testing.assert_equal(bandmem.data(), numpy.arange(100).reshape(10, 10))
else:
self.assertEqual(bandmem.data(), list(range(100)))
# Prepare data for setting values in subsequent tests
block = list(range(100, 104))
packed_block = struct.pack('<' + 'B B B B', *block)
# Set data from list
bandmem.data(block, (1, 1), (2, 2))
result = bandmem.data(offset=(1, 1), size=(2, 2))
if numpy:
numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
else:
self.assertEqual(result, block)
# Set data from packed block
bandmem.data(packed_block, (1, 1), (2, 2))
result = bandmem.data(offset=(1, 1), size=(2, 2))
if numpy:
numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
else:
self.assertEqual(result, block)
# Set data from bytes
bandmem.data(bytes(packed_block), (1, 1), (2, 2))
result = bandmem.data(offset=(1, 1), size=(2, 2))
if numpy:
numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
else:
self.assertEqual(result, block)
# Set data from bytearray
bandmem.data(bytearray(packed_block), (1, 1), (2, 2))
result = bandmem.data(offset=(1, 1), size=(2, 2))
if numpy:
numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
else:
self.assertEqual(result, block)
# Set data from memoryview
bandmem.data(memoryview(packed_block), (1, 1), (2, 2))
result = bandmem.data(offset=(1, 1), size=(2, 2))
if numpy:
numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
else:
self.assertEqual(result, block)
# Set data from numpy array
if numpy:
bandmem.data(numpy.array(block, dtype='int8').reshape(2, 2), (1, 1), (2, 2))
numpy.testing.assert_equal(
bandmem.data(offset=(1, 1), size=(2, 2)),
numpy.array(block).reshape(2, 2)
)
# Test json input data
rsmemjson = GDALRaster(JSON_RASTER)
bandmemjson = rsmemjson.bands[0]
if numpy:
numpy.testing.assert_equal(
bandmemjson.data(),
numpy.array(range(25)).reshape(5, 5)
)
else:
self.assertEqual(bandmemjson.data(), list(range(25)))
def test_band_statistics_automatic_refresh(self):
rsmem = GDALRaster({
'srid': 4326,
'width': 2,
'height': 2,
'bands': [{'data': [0] * 4, 'nodata_value': 99}],
})
band = rsmem.bands[0]
# Populate statistics cache
self.assertEqual(band.statistics(), (0, 0, 0, 0))
# Change data
band.data([1, 1, 0, 0])
# Statistics are properly updated
self.assertEqual(band.statistics(), (0.0, 1.0, 0.5, 0.5))
# Change nodata_value
band.nodata_value = 0
# Statistics are properly updated
self.assertEqual(band.statistics(), (1.0, 1.0, 1.0, 0.0))
def test_band_statistics_empty_band(self):
rsmem = GDALRaster({
'srid': 4326,
'width': 1,
'height': 1,
'bands': [{'data': [0], 'nodata_value': 0}],
})
self.assertEqual(rsmem.bands[0].statistics(), (None, None, None, None))
def test_band_delete_nodata(self):
rsmem = GDALRaster({
'srid': 4326,
'width': 1,
'height': 1,
'bands': [{'data': [0], 'nodata_value': 1}],
})
if GDAL_VERSION < (2, 1):
msg = 'GDAL >= 2.1 required to delete nodata values.'
with self.assertRaisesMessage(ValueError, msg):
rsmem.bands[0].nodata_value = None
else:
rsmem.bands[0].nodata_value = None
self.assertIsNone(rsmem.bands[0].nodata_value)
def test_band_data_replication(self):
band = GDALRaster({
'srid': 4326,
'width': 3,
'height': 3,
'bands': [{'data': range(10, 19), 'nodata_value': 0}],
}).bands[0]
# Variations for input (data, shape, expected result).
combos = (
([1], (1, 1), [1] * 9),
(range(3), (1, 3), [0, 0, 0, 1, 1, 1, 2, 2, 2]),
(range(3), (3, 1), [0, 1, 2, 0, 1, 2, 0, 1, 2]),
)
for combo in combos:
band.data(combo[0], shape=combo[1])
if numpy:
numpy.testing.assert_equal(band.data(), numpy.array(combo[2]).reshape(3, 3))
else:
self.assertEqual(band.data(), list(combo[2]))
|
1669c759b11caff1cef4db63b3bced7715b22f34b7a4dd100f7ea09669b259cf | import unittest
from django.contrib.gis.gdal import (
GDAL_VERSION, gdal_full_version, gdal_version,
)
class GDALTest(unittest.TestCase):
def test_gdal_version(self):
if GDAL_VERSION:
self.assertEqual(gdal_version(), ('%s.%s.%s' % GDAL_VERSION).encode())
else:
self.assertIn(b'.', gdal_version())
def test_gdal_full_version(self):
full_version = gdal_full_version()
self.assertIn(gdal_version(), full_version)
self.assertTrue(full_version.startswith(b'GDAL'))
|
f52293ee60023c8ffc2085bb284fc94056d546d96ea4dbe0204014fcda68596d | from django.contrib.gis.db import models
from django.db import migrations
from django.db.models import deletion
class Migration(migrations.Migration):
dependencies = [
('rasterapp', '0001_setup_extensions'),
]
operations = [
migrations.CreateModel(
name='RasterModel',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('rast', models.fields.RasterField(
blank=True,
null=True,
srid=4326,
verbose_name='A Verbose Raster Name',
)),
('rastprojected', models.fields.RasterField(
null=True,
srid=3086,
verbose_name='A Projected Raster Table',
)),
('geom', models.fields.PointField(null=True, srid=4326)),
],
options={
'required_db_features': ['supports_raster'],
},
),
migrations.CreateModel(
name='RasterRelatedModel',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('rastermodel', models.ForeignKey(
on_delete=deletion.CASCADE,
to='rasterapp.rastermodel',
)),
],
options={
'required_db_features': ['supports_raster'],
},
),
]
|
aa43783ec8f9b81ff18d829798e4f7b6f31c98f6243c4a313c630b87477d943e | from django.db import connection, migrations
if connection.features.supports_raster:
from django.contrib.postgres.operations import CreateExtension
pg_version = connection.ops.postgis_version_tuple()
class Migration(migrations.Migration):
# PostGIS 3+ requires postgis_raster extension.
if pg_version[1:] >= (3,):
operations = [
CreateExtension('postgis_raster'),
]
else:
operations = []
else:
class Migration(migrations.Migration):
operations = []
|
636f6dab06f27747c3e0cd141341c2f0807d5c4e811644aa2b63c6db608919dd | from django.contrib.gis.db import models
from django.db import connection, migrations
ops = [
migrations.CreateModel(
name='Neighborhood',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('name', models.CharField(max_length=100, unique=True)),
('geom', models.MultiPolygonField(srid=4326)),
],
options={
},
bases=(models.Model,),
),
migrations.CreateModel(
name='Household',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('neighborhood', models.ForeignKey(
'gis_migrations.Neighborhood',
models.SET_NULL,
to_field='id',
null=True,
)),
('address', models.CharField(max_length=100)),
('zip_code', models.IntegerField(null=True, blank=True)),
('geom', models.PointField(srid=4326, geography=True)),
],
options={
},
bases=(models.Model,),
),
migrations.CreateModel(
name='Family',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('name', models.CharField(max_length=100, unique=True)),
],
options={
},
bases=(models.Model,),
),
migrations.AddField(
model_name='household',
name='family',
field=models.ForeignKey('gis_migrations.Family', models.SET_NULL, blank=True, null=True),
preserve_default=True,
)
]
if connection.features.supports_raster:
ops += [
migrations.CreateModel(
name='Heatmap',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('name', models.CharField(max_length=100, unique=True)),
('rast', models.fields.RasterField(srid=4326)),
],
options={
},
bases=(models.Model,),
),
]
class Migration(migrations.Migration):
"""
Used for gis-specific migration tests.
"""
dependencies = [
('gis_migrations', '0001_setup_extensions'),
]
operations = ops
|
e234acc6b33ec28cc1f9c3a1a63579a8629abb7af03065a8e7ec523dba50ba46 | from django.db import models
from django.db.models.fields.related import ReverseManyToOneDescriptor
from django.db.models.lookups import StartsWith
from django.db.models.query_utils import PathInfo
class CustomForeignObjectRel(models.ForeignObjectRel):
"""
Define some extra Field methods so this Rel acts more like a Field, which
lets us use ReverseManyToOneDescriptor in both directions.
"""
@property
def foreign_related_fields(self):
return tuple(lhs_field for lhs_field, rhs_field in self.field.related_fields)
def get_attname(self):
return self.name
class StartsWithRelation(models.ForeignObject):
"""
A ForeignObject that uses StartsWith operator in its joins instead of
the default equality operator. This is logically a many-to-many relation
and creates a ReverseManyToOneDescriptor in both directions.
"""
auto_created = False
many_to_many = False
many_to_one = True
one_to_many = False
one_to_one = False
rel_class = CustomForeignObjectRel
def __init__(self, *args, **kwargs):
kwargs['on_delete'] = models.DO_NOTHING
super().__init__(*args, **kwargs)
@property
def field(self):
"""
Makes ReverseManyToOneDescriptor work in both directions.
"""
return self.remote_field
def get_extra_restriction(self, where_class, alias, related_alias):
to_field = self.remote_field.model._meta.get_field(self.to_fields[0])
from_field = self.model._meta.get_field(self.from_fields[0])
return StartsWith(to_field.get_col(alias), from_field.get_col(related_alias))
def get_joining_columns(self, reverse_join=False):
return ()
def get_path_info(self, filtered_relation=None):
to_opts = self.remote_field.model._meta
from_opts = self.model._meta
return [PathInfo(
from_opts=from_opts,
to_opts=to_opts,
target_fields=(to_opts.pk,),
join_field=self,
m2m=False,
direct=False,
filtered_relation=filtered_relation,
)]
def get_reverse_path_info(self, filtered_relation=None):
to_opts = self.model._meta
from_opts = self.remote_field.model._meta
return [PathInfo(
from_opts=from_opts,
to_opts=to_opts,
target_fields=(to_opts.pk,),
join_field=self.remote_field,
m2m=False,
direct=False,
filtered_relation=filtered_relation,
)]
def contribute_to_class(self, cls, name, private_only=False):
super().contribute_to_class(cls, name, private_only)
setattr(cls, self.name, ReverseManyToOneDescriptor(self))
class BrokenContainsRelation(StartsWithRelation):
"""
This model is designed to yield no join conditions and
raise an exception in ``Join.as_sql()``.
"""
def get_extra_restriction(self, where_class, alias, related_alias):
return None
class SlugPage(models.Model):
slug = models.CharField(max_length=20, unique=True)
descendants = StartsWithRelation(
'self',
from_fields=['slug'],
to_fields=['slug'],
related_name='ascendants',
)
containers = BrokenContainsRelation(
'self',
from_fields=['slug'],
to_fields=['slug'],
)
class Meta:
ordering = ['slug']
def __str__(self):
return 'SlugPage %s' % self.slug
|
e4264a6767a1849d6138f9557ab93f41cfe926e65c4c80ccf5f5ac852a0cd0a3 | from django.db import models
class Address(models.Model):
company = models.CharField(max_length=1)
customer_id = models.IntegerField()
class Meta:
unique_together = [
('company', 'customer_id'),
]
class Customer(models.Model):
company = models.CharField(max_length=1)
customer_id = models.IntegerField()
address = models.ForeignObject(
Address, models.CASCADE, null=True,
# order mismatches the Contact ForeignObject.
from_fields=['company', 'customer_id'],
to_fields=['company', 'customer_id'],
)
class Meta:
unique_together = [
('company', 'customer_id'),
]
class Contact(models.Model):
company_code = models.CharField(max_length=1)
customer_code = models.IntegerField()
customer = models.ForeignObject(
Customer, models.CASCADE, related_name='contacts',
to_fields=['customer_id', 'company'],
from_fields=['customer_code', 'company_code'],
)
|
b3e48110ea22eaef134aaca8a4fd3b20fb8d989bbac5511cc01f81d9cb6b7e65 | import unittest
from django.db import NotSupportedError, connection
from django.db.models import CharField
from django.db.models.functions import SHA224
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import Author
class SHA224Tests(TestCase):
@classmethod
def setUpTestData(cls):
Author.objects.bulk_create([
Author(alias='John Smith'),
Author(alias='Jordan Élena'),
Author(alias='皇帝'),
Author(alias=''),
Author(alias=None),
])
@unittest.skipIf(connection.vendor == 'oracle', "Oracle doesn't support SHA224.")
def test_basic(self):
authors = Author.objects.annotate(
sha224_alias=SHA224('alias'),
).values_list('sha224_alias', flat=True).order_by('pk')
self.assertSequenceEqual(
authors,
[
'a61303c220731168452cb6acf3759438b1523e768f464e3704e12f70',
'2297904883e78183cb118fc3dc21a610d60daada7b6ebdbc85139f4d',
'eba942746e5855121d9d8f79e27dfdebed81adc85b6bf41591203080',
'd14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f',
'd14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f'
if connection.features.interprets_empty_strings_as_nulls else None,
],
)
@unittest.skipIf(connection.vendor == 'oracle', "Oracle doesn't support SHA224.")
def test_transform(self):
with register_lookup(CharField, SHA224):
authors = Author.objects.filter(
alias__sha224='a61303c220731168452cb6acf3759438b1523e768f464e3704e12f70',
).values_list('alias', flat=True)
self.assertSequenceEqual(authors, ['John Smith'])
@unittest.skipUnless(connection.vendor == 'oracle', "Oracle doesn't support SHA224.")
def test_unsupported(self):
msg = 'SHA224 is not supported on Oracle.'
with self.assertRaisesMessage(NotSupportedError, msg):
Author.objects.annotate(sha224_alias=SHA224('alias')).first()
|
446e193a1062534e618772d573e9096fa3736f715f9631e2297c9dad61c3757a | import datetime
import decimal
import unittest
from django.db import connection, models
from django.db.models.functions import Cast
from django.test import (
TestCase, ignore_warnings, override_settings, skipUnlessDBFeature,
)
from ..models import Author, DTModel, Fan, FloatModel
class CastTests(TestCase):
@classmethod
def setUpTestData(self):
Author.objects.create(name='Bob', age=1, alias='1')
def test_cast_from_value(self):
numbers = Author.objects.annotate(cast_integer=Cast(models.Value('0'), models.IntegerField()))
self.assertEqual(numbers.get().cast_integer, 0)
def test_cast_from_field(self):
numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField(max_length=255)),)
self.assertEqual(numbers.get().cast_string, '1')
def test_cast_to_char_field_without_max_length(self):
numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField()))
self.assertEqual(numbers.get().cast_string, '1')
# Silence "Truncated incorrect CHAR(1) value: 'Bob'".
@ignore_warnings(module='django.db.backends.mysql.base')
@skipUnlessDBFeature('supports_cast_with_precision')
def test_cast_to_char_field_with_max_length(self):
names = Author.objects.annotate(cast_string=Cast('name', models.CharField(max_length=1)))
self.assertEqual(names.get().cast_string, 'B')
@skipUnlessDBFeature('supports_cast_with_precision')
def test_cast_to_decimal_field(self):
FloatModel.objects.create(f1=-1.934, f2=3.467)
float_obj = FloatModel.objects.annotate(
cast_f1_decimal=Cast('f1', models.DecimalField(max_digits=8, decimal_places=2)),
cast_f2_decimal=Cast('f2', models.DecimalField(max_digits=8, decimal_places=1)),
).get()
self.assertEqual(float_obj.cast_f1_decimal, decimal.Decimal('-1.93'))
self.assertEqual(float_obj.cast_f2_decimal, decimal.Decimal('3.5'))
author_obj = Author.objects.annotate(
cast_alias_decimal=Cast('alias', models.DecimalField(max_digits=8, decimal_places=2)),
).get()
self.assertEqual(author_obj.cast_alias_decimal, decimal.Decimal('1'))
def test_cast_to_integer(self):
for field_class in (
models.AutoField,
models.BigAutoField,
models.SmallAutoField,
models.IntegerField,
models.BigIntegerField,
models.SmallIntegerField,
models.PositiveBigIntegerField,
models.PositiveIntegerField,
models.PositiveSmallIntegerField,
):
with self.subTest(field_class=field_class):
numbers = Author.objects.annotate(cast_int=Cast('alias', field_class()))
self.assertEqual(numbers.get().cast_int, 1)
def test_cast_from_db_datetime_to_date(self):
dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
DTModel.objects.create(start_datetime=dt_value)
dtm = DTModel.objects.annotate(
start_datetime_as_date=Cast('start_datetime', models.DateField())
).first()
self.assertEqual(dtm.start_datetime_as_date, datetime.date(2018, 9, 28))
def test_cast_from_db_datetime_to_time(self):
dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
DTModel.objects.create(start_datetime=dt_value)
dtm = DTModel.objects.annotate(
start_datetime_as_time=Cast('start_datetime', models.TimeField())
).first()
rounded_ms = int(round(.234567, connection.features.time_cast_precision) * 10**6)
self.assertEqual(dtm.start_datetime_as_time, datetime.time(12, 42, 10, rounded_ms))
def test_cast_from_db_date_to_datetime(self):
dt_value = datetime.date(2018, 9, 28)
DTModel.objects.create(start_date=dt_value)
dtm = DTModel.objects.annotate(start_as_datetime=Cast('start_date', models.DateTimeField())).first()
self.assertEqual(dtm.start_as_datetime, datetime.datetime(2018, 9, 28, 0, 0, 0, 0))
def test_cast_from_db_datetime_to_date_group_by(self):
author = Author.objects.create(name='John Smith', age=45)
dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
Fan.objects.create(name='Margaret', age=50, author=author, fan_since=dt_value)
fans = Fan.objects.values('author').annotate(
fan_for_day=Cast('fan_since', models.DateField()),
fans=models.Count('*')
).values()
self.assertEqual(fans[0]['fan_for_day'], datetime.date(2018, 9, 28))
self.assertEqual(fans[0]['fans'], 1)
def test_cast_from_python_to_date(self):
today = datetime.date.today()
dates = Author.objects.annotate(cast_date=Cast(today, models.DateField()))
self.assertEqual(dates.get().cast_date, today)
def test_cast_from_python_to_datetime(self):
now = datetime.datetime.now()
dates = Author.objects.annotate(cast_datetime=Cast(now, models.DateTimeField()))
time_precision = datetime.timedelta(
microseconds=10**(6 - connection.features.time_cast_precision)
)
self.assertAlmostEqual(dates.get().cast_datetime, now, delta=time_precision)
def test_cast_from_python(self):
numbers = Author.objects.annotate(cast_float=Cast(decimal.Decimal(0.125), models.FloatField()))
cast_float = numbers.get().cast_float
self.assertIsInstance(cast_float, float)
self.assertEqual(cast_float, 0.125)
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL test')
@override_settings(DEBUG=True)
def test_expression_wrapped_with_parentheses_on_postgresql(self):
"""
The SQL for the Cast expression is wrapped with parentheses in case
it's a complex expression.
"""
list(Author.objects.annotate(cast_float=Cast(models.Avg('age'), models.FloatField())))
self.assertIn('(AVG("db_functions_author"."age"))::double precision', connection.queries[-1]['sql'])
def test_cast_to_text_field(self):
self.assertEqual(Author.objects.values_list(Cast('age', models.TextField()), flat=True).get(), '1')
|
4b173b504fdac97cdac17b6e133273082c713a81e8a70d3e0feae93ccd39f381 | import os
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.http import HttpResponse, HttpResponsePermanentRedirect
from django.middleware.locale import LocaleMiddleware
from django.template import Context, Template
from django.test import SimpleTestCase, override_settings
from django.test.client import RequestFactory
from django.test.utils import override_script_prefix
from django.urls import clear_url_caches, reverse, translate_url
from django.utils import translation
class PermanentRedirectLocaleMiddleWare(LocaleMiddleware):
response_redirect_class = HttpResponsePermanentRedirect
@override_settings(
USE_I18N=True,
LOCALE_PATHS=[
os.path.join(os.path.dirname(__file__), 'locale'),
],
LANGUAGE_CODE='en-us',
LANGUAGES=[
('nl', 'Dutch'),
('en', 'English'),
('pt-br', 'Brazilian Portuguese'),
],
MIDDLEWARE=[
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
],
ROOT_URLCONF='i18n.patterns.urls.default',
TEMPLATES=[{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [os.path.join(os.path.dirname(__file__), 'templates')],
'OPTIONS': {
'context_processors': [
'django.template.context_processors.i18n',
],
},
}],
)
class URLTestCaseBase(SimpleTestCase):
"""
TestCase base-class for the URL tests.
"""
def setUp(self):
# Make sure the cache is empty before we are doing our tests.
clear_url_caches()
def tearDown(self):
# Make sure we will leave an empty cache for other testcases.
clear_url_caches()
class URLPrefixTests(URLTestCaseBase):
"""
Tests if the `i18n_patterns` is adding the prefix correctly.
"""
def test_not_prefixed(self):
with translation.override('en'):
self.assertEqual(reverse('not-prefixed'), '/not-prefixed/')
self.assertEqual(reverse('not-prefixed-included-url'), '/not-prefixed-include/foo/')
with translation.override('nl'):
self.assertEqual(reverse('not-prefixed'), '/not-prefixed/')
self.assertEqual(reverse('not-prefixed-included-url'), '/not-prefixed-include/foo/')
def test_prefixed(self):
with translation.override('en'):
self.assertEqual(reverse('prefixed'), '/en/prefixed/')
with translation.override('nl'):
self.assertEqual(reverse('prefixed'), '/nl/prefixed/')
with translation.override(None):
self.assertEqual(reverse('prefixed'), '/%s/prefixed/' % settings.LANGUAGE_CODE)
@override_settings(ROOT_URLCONF='i18n.patterns.urls.wrong')
def test_invalid_prefix_use(self):
msg = 'Using i18n_patterns in an included URLconf is not allowed.'
with self.assertRaisesMessage(ImproperlyConfigured, msg):
reverse('account:register')
@override_settings(ROOT_URLCONF='i18n.patterns.urls.disabled')
class URLDisabledTests(URLTestCaseBase):
@override_settings(USE_I18N=False)
def test_prefixed_i18n_disabled(self):
with translation.override('en'):
self.assertEqual(reverse('prefixed'), '/prefixed/')
with translation.override('nl'):
self.assertEqual(reverse('prefixed'), '/prefixed/')
class RequestURLConfTests(SimpleTestCase):
@override_settings(ROOT_URLCONF='i18n.patterns.urls.path_unused')
def test_request_urlconf_considered(self):
request = RequestFactory().get('/nl/')
request.urlconf = 'i18n.patterns.urls.default'
middleware = LocaleMiddleware(lambda req: HttpResponse())
with translation.override('nl'):
middleware.process_request(request)
self.assertEqual(request.LANGUAGE_CODE, 'nl')
@override_settings(ROOT_URLCONF='i18n.patterns.urls.path_unused')
class PathUnusedTests(URLTestCaseBase):
"""
If no i18n_patterns is used in root URLconfs, then no language activation
activation happens based on url prefix.
"""
def test_no_lang_activate(self):
response = self.client.get('/nl/foo/')
self.assertEqual(response.status_code, 200)
self.assertEqual(response['content-language'], 'en')
self.assertEqual(response.context['LANGUAGE_CODE'], 'en')
class URLTranslationTests(URLTestCaseBase):
"""
Tests if the pattern-strings are translated correctly (within the
`i18n_patterns` and the normal `patterns` function).
"""
def test_no_prefix_translated(self):
with translation.override('en'):
self.assertEqual(reverse('no-prefix-translated'), '/translated/')
self.assertEqual(reverse('no-prefix-translated-slug', kwargs={'slug': 'yeah'}), '/translated/yeah/')
with translation.override('nl'):
self.assertEqual(reverse('no-prefix-translated'), '/vertaald/')
self.assertEqual(reverse('no-prefix-translated-slug', kwargs={'slug': 'yeah'}), '/vertaald/yeah/')
with translation.override('pt-br'):
self.assertEqual(reverse('no-prefix-translated'), '/traduzidos/')
self.assertEqual(reverse('no-prefix-translated-slug', kwargs={'slug': 'yeah'}), '/traduzidos/yeah/')
def test_users_url(self):
with translation.override('en'):
self.assertEqual(reverse('users'), '/en/users/')
with translation.override('nl'):
self.assertEqual(reverse('users'), '/nl/gebruikers/')
self.assertEqual(reverse('prefixed_xml'), '/nl/prefixed.xml')
with translation.override('pt-br'):
self.assertEqual(reverse('users'), '/pt-br/usuarios/')
def test_translate_url_utility(self):
with translation.override('en'):
self.assertEqual(translate_url('/en/nonexistent/', 'nl'), '/en/nonexistent/')
self.assertEqual(translate_url('/en/users/', 'nl'), '/nl/gebruikers/')
# Namespaced URL
self.assertEqual(translate_url('/en/account/register/', 'nl'), '/nl/profiel/registreren/')
# path() URL pattern
self.assertEqual(translate_url('/en/account/register-as-path/', 'nl'), '/nl/profiel/registreren-als-pad/')
self.assertEqual(translation.get_language(), 'en')
# URL with parameters.
self.assertEqual(
translate_url('/en/with-arguments/regular-argument/', 'nl'),
'/nl/with-arguments/regular-argument/',
)
self.assertEqual(
translate_url('/en/with-arguments/regular-argument/optional.html', 'nl'),
'/nl/with-arguments/regular-argument/optional.html',
)
with translation.override('nl'):
self.assertEqual(translate_url('/nl/gebruikers/', 'en'), '/en/users/')
self.assertEqual(translation.get_language(), 'nl')
class URLNamespaceTests(URLTestCaseBase):
"""
Tests if the translations are still working within namespaces.
"""
def test_account_register(self):
with translation.override('en'):
self.assertEqual(reverse('account:register'), '/en/account/register/')
self.assertEqual(reverse('account:register-as-path'), '/en/account/register-as-path/')
with translation.override('nl'):
self.assertEqual(reverse('account:register'), '/nl/profiel/registreren/')
self.assertEqual(reverse('account:register-as-path'), '/nl/profiel/registreren-als-pad/')
class URLRedirectTests(URLTestCaseBase):
"""
Tests if the user gets redirected to the right URL when there is no
language-prefix in the request URL.
"""
def test_no_prefix_response(self):
response = self.client.get('/not-prefixed/')
self.assertEqual(response.status_code, 200)
def test_en_redirect(self):
response = self.client.get('/account/register/', HTTP_ACCEPT_LANGUAGE='en')
self.assertRedirects(response, '/en/account/register/')
response = self.client.get(response['location'])
self.assertEqual(response.status_code, 200)
def test_en_redirect_wrong_url(self):
response = self.client.get('/profiel/registreren/', HTTP_ACCEPT_LANGUAGE='en')
self.assertEqual(response.status_code, 404)
def test_nl_redirect(self):
response = self.client.get('/profiel/registreren/', HTTP_ACCEPT_LANGUAGE='nl')
self.assertRedirects(response, '/nl/profiel/registreren/')
response = self.client.get(response['location'])
self.assertEqual(response.status_code, 200)
def test_nl_redirect_wrong_url(self):
response = self.client.get('/account/register/', HTTP_ACCEPT_LANGUAGE='nl')
self.assertEqual(response.status_code, 404)
def test_pt_br_redirect(self):
response = self.client.get('/conta/registre-se/', HTTP_ACCEPT_LANGUAGE='pt-br')
self.assertRedirects(response, '/pt-br/conta/registre-se/')
response = self.client.get(response['location'])
self.assertEqual(response.status_code, 200)
def test_pl_pl_redirect(self):
# language from outside of the supported LANGUAGES list
response = self.client.get('/account/register/', HTTP_ACCEPT_LANGUAGE='pl-pl')
self.assertRedirects(response, '/en/account/register/')
response = self.client.get(response['location'])
self.assertEqual(response.status_code, 200)
@override_settings(
MIDDLEWARE=[
'i18n.patterns.tests.PermanentRedirectLocaleMiddleWare',
'django.middleware.common.CommonMiddleware',
],
)
def test_custom_redirect_class(self):
response = self.client.get('/account/register/', HTTP_ACCEPT_LANGUAGE='en')
self.assertRedirects(response, '/en/account/register/', 301)
class URLVaryAcceptLanguageTests(URLTestCaseBase):
"""
'Accept-Language' is not added to the Vary header when using prefixed URLs.
"""
def test_no_prefix_response(self):
response = self.client.get('/not-prefixed/')
self.assertEqual(response.status_code, 200)
self.assertEqual(response.get('Vary'), 'Accept-Language')
def test_en_redirect(self):
response = self.client.get('/account/register/', HTTP_ACCEPT_LANGUAGE='en')
self.assertRedirects(response, '/en/account/register/')
self.assertFalse(response.get('Vary'))
response = self.client.get(response['location'])
self.assertEqual(response.status_code, 200)
self.assertFalse(response.get('Vary'))
class URLRedirectWithoutTrailingSlashTests(URLTestCaseBase):
"""
Tests the redirect when the requested URL doesn't end with a slash
(`settings.APPEND_SLASH=True`).
"""
def test_not_prefixed_redirect(self):
response = self.client.get('/not-prefixed', HTTP_ACCEPT_LANGUAGE='en')
self.assertRedirects(response, '/not-prefixed/', 301)
def test_en_redirect(self):
response = self.client.get('/account/register', HTTP_ACCEPT_LANGUAGE='en', follow=True)
# We only want one redirect, bypassing CommonMiddleware
self.assertEqual(response.redirect_chain, [('/en/account/register/', 302)])
self.assertRedirects(response, '/en/account/register/', 302)
response = self.client.get('/prefixed.xml', HTTP_ACCEPT_LANGUAGE='en', follow=True)
self.assertRedirects(response, '/en/prefixed.xml', 302)
class URLRedirectWithoutTrailingSlashSettingTests(URLTestCaseBase):
"""
Tests the redirect when the requested URL doesn't end with a slash
(`settings.APPEND_SLASH=False`).
"""
@override_settings(APPEND_SLASH=False)
def test_not_prefixed_redirect(self):
response = self.client.get('/not-prefixed', HTTP_ACCEPT_LANGUAGE='en')
self.assertEqual(response.status_code, 404)
@override_settings(APPEND_SLASH=False)
def test_en_redirect(self):
response = self.client.get('/account/register-without-slash', HTTP_ACCEPT_LANGUAGE='en')
self.assertRedirects(response, '/en/account/register-without-slash', 302)
response = self.client.get(response['location'])
self.assertEqual(response.status_code, 200)
class URLResponseTests(URLTestCaseBase):
"""Tests if the response has the correct language code."""
def test_not_prefixed_with_prefix(self):
response = self.client.get('/en/not-prefixed/')
self.assertEqual(response.status_code, 404)
def test_en_url(self):
response = self.client.get('/en/account/register/')
self.assertEqual(response.status_code, 200)
self.assertEqual(response['content-language'], 'en')
self.assertEqual(response.context['LANGUAGE_CODE'], 'en')
def test_nl_url(self):
response = self.client.get('/nl/profiel/registreren/')
self.assertEqual(response.status_code, 200)
self.assertEqual(response['content-language'], 'nl')
self.assertEqual(response.context['LANGUAGE_CODE'], 'nl')
def test_wrong_en_prefix(self):
response = self.client.get('/en/profiel/registreren/')
self.assertEqual(response.status_code, 404)
def test_wrong_nl_prefix(self):
response = self.client.get('/nl/account/register/')
self.assertEqual(response.status_code, 404)
def test_pt_br_url(self):
response = self.client.get('/pt-br/conta/registre-se/')
self.assertEqual(response.status_code, 200)
self.assertEqual(response['content-language'], 'pt-br')
self.assertEqual(response.context['LANGUAGE_CODE'], 'pt-br')
def test_en_path(self):
response = self.client.get('/en/account/register-as-path/')
self.assertEqual(response.status_code, 200)
self.assertEqual(response['content-language'], 'en')
self.assertEqual(response.context['LANGUAGE_CODE'], 'en')
def test_nl_path(self):
response = self.client.get('/nl/profiel/registreren-als-pad/')
self.assertEqual(response.status_code, 200)
self.assertEqual(response['content-language'], 'nl')
self.assertEqual(response.context['LANGUAGE_CODE'], 'nl')
class URLRedirectWithScriptAliasTests(URLTestCaseBase):
"""
#21579 - LocaleMiddleware should respect the script prefix.
"""
def test_language_prefix_with_script_prefix(self):
prefix = '/script_prefix'
with override_script_prefix(prefix):
response = self.client.get('/prefixed/', HTTP_ACCEPT_LANGUAGE='en', SCRIPT_NAME=prefix)
self.assertRedirects(response, '%s/en/prefixed/' % prefix, target_status_code=404)
class URLTagTests(URLTestCaseBase):
"""
Test if the language tag works.
"""
def test_strings_only(self):
t = Template("""{% load i18n %}
{% language 'nl' %}{% url 'no-prefix-translated' %}{% endlanguage %}
{% language 'pt-br' %}{% url 'no-prefix-translated' %}{% endlanguage %}""")
self.assertEqual(t.render(Context({})).strip().split(),
['/vertaald/', '/traduzidos/'])
def test_context(self):
ctx = Context({'lang1': 'nl', 'lang2': 'pt-br'})
tpl = Template("""{% load i18n %}
{% language lang1 %}{% url 'no-prefix-translated' %}{% endlanguage %}
{% language lang2 %}{% url 'no-prefix-translated' %}{% endlanguage %}""")
self.assertEqual(tpl.render(ctx).strip().split(),
['/vertaald/', '/traduzidos/'])
def test_args(self):
tpl = Template("""{% load i18n %}
{% language 'nl' %}{% url 'no-prefix-translated-slug' 'apo' %}{% endlanguage %}
{% language 'pt-br' %}{% url 'no-prefix-translated-slug' 'apo' %}{% endlanguage %}""")
self.assertEqual(tpl.render(Context({})).strip().split(),
['/vertaald/apo/', '/traduzidos/apo/'])
def test_kwargs(self):
tpl = Template("""{% load i18n %}
{% language 'nl' %}{% url 'no-prefix-translated-slug' slug='apo' %}{% endlanguage %}
{% language 'pt-br' %}{% url 'no-prefix-translated-slug' slug='apo' %}{% endlanguage %}""")
self.assertEqual(tpl.render(Context({})).strip().split(),
['/vertaald/apo/', '/traduzidos/apo/'])
|
46db07ee55d83f3354ca635a3d686615e4f3f025cf9fe9ee1f404ebff12c220c | """
Sphinx plugins for Django documentation.
"""
import json
import os
import re
from docutils import nodes
from docutils.parsers.rst import Directive
from docutils.statemachine import ViewList
from sphinx import addnodes
from sphinx.builders.html import StandaloneHTMLBuilder
from sphinx.directives.code import CodeBlock
from sphinx.domains.std import Cmdoption
from sphinx.errors import ExtensionError, SphinxError
from sphinx.util import logging
from sphinx.util.console import bold, red
from sphinx.writers.html import HTMLTranslator
logger = logging.getLogger(__name__)
# RE for option descriptions without a '--' prefix
simple_option_desc_re = re.compile(
r'([-_a-zA-Z0-9]+)(\s*.*?)(?=,\s+(?:/|-|--)|$)')
def setup(app):
app.add_crossref_type(
directivename="setting",
rolename="setting",
indextemplate="pair: %s; setting",
)
app.add_crossref_type(
directivename="templatetag",
rolename="ttag",
indextemplate="pair: %s; template tag"
)
app.add_crossref_type(
directivename="templatefilter",
rolename="tfilter",
indextemplate="pair: %s; template filter"
)
app.add_crossref_type(
directivename="fieldlookup",
rolename="lookup",
indextemplate="pair: %s; field lookup type",
)
app.add_object_type(
directivename="django-admin",
rolename="djadmin",
indextemplate="pair: %s; django-admin command",
parse_node=parse_django_admin_node,
)
app.add_directive('django-admin-option', Cmdoption)
app.add_config_value('django_next_version', '0.0', True)
app.add_directive('versionadded', VersionDirective)
app.add_directive('versionchanged', VersionDirective)
app.add_builder(DjangoStandaloneHTMLBuilder)
app.set_translator('djangohtml', DjangoHTMLTranslator)
app.set_translator('json', DjangoHTMLTranslator)
app.add_node(
ConsoleNode,
html=(visit_console_html, None),
latex=(visit_console_dummy, depart_console_dummy),
man=(visit_console_dummy, depart_console_dummy),
text=(visit_console_dummy, depart_console_dummy),
texinfo=(visit_console_dummy, depart_console_dummy),
)
app.add_directive('console', ConsoleDirective)
app.connect('html-page-context', html_page_context_hook)
app.add_role('default-role-error', default_role_error)
return {'parallel_read_safe': True}
class VersionDirective(Directive):
has_content = True
required_arguments = 1
optional_arguments = 1
final_argument_whitespace = True
option_spec = {}
def run(self):
if len(self.arguments) > 1:
msg = """Only one argument accepted for directive '{directive_name}::'.
Comments should be provided as content,
not as an extra argument.""".format(directive_name=self.name)
raise self.error(msg)
env = self.state.document.settings.env
ret = []
node = addnodes.versionmodified()
ret.append(node)
if self.arguments[0] == env.config.django_next_version:
node['version'] = "Development version"
else:
node['version'] = self.arguments[0]
node['type'] = self.name
if self.content:
self.state.nested_parse(self.content, self.content_offset, node)
try:
env.get_domain('changeset').note_changeset(node)
except ExtensionError:
# Sphinx < 1.8: Domain 'changeset' is not registered
env.note_versionchange(node['type'], node['version'], node, self.lineno)
return ret
class DjangoHTMLTranslator(HTMLTranslator):
"""
Django-specific reST to HTML tweaks.
"""
# Don't use border=1, which docutils does by default.
def visit_table(self, node):
self.context.append(self.compact_p)
self.compact_p = True
self._table_row_index = 0 # Needed by Sphinx
self.body.append(self.starttag(node, 'table', CLASS='docutils'))
def depart_table(self, node):
self.compact_p = self.context.pop()
self.body.append('</table>\n')
def visit_desc_parameterlist(self, node):
self.body.append('(') # by default sphinx puts <big> around the "("
self.first_param = 1
self.optional_param_level = 0
self.param_separator = node.child_text_separator
self.required_params_left = sum(isinstance(c, addnodes.desc_parameter) for c in node.children)
def depart_desc_parameterlist(self, node):
self.body.append(')')
#
# Turn the "new in version" stuff (versionadded/versionchanged) into a
# better callout -- the Sphinx default is just a little span,
# which is a bit less obvious that I'd like.
#
# FIXME: these messages are all hardcoded in English. We need to change
# that to accommodate other language docs, but I can't work out how to make
# that work.
#
version_text = {
'versionchanged': 'Changed in Django %s',
'versionadded': 'New in Django %s',
}
def visit_versionmodified(self, node):
self.body.append(
self.starttag(node, 'div', CLASS=node['type'])
)
version_text = self.version_text.get(node['type'])
if version_text:
title = "%s%s" % (
version_text % node['version'],
":" if len(node) else "."
)
self.body.append('<span class="title">%s</span> ' % title)
def depart_versionmodified(self, node):
self.body.append("</div>\n")
# Give each section a unique ID -- nice for custom CSS hooks
def visit_section(self, node):
old_ids = node.get('ids', [])
node['ids'] = ['s-' + i for i in old_ids]
node['ids'].extend(old_ids)
super().visit_section(node)
node['ids'] = old_ids
def parse_django_admin_node(env, sig, signode):
command = sig.split(' ')[0]
env.ref_context['std:program'] = command
title = "django-admin %s" % sig
signode += addnodes.desc_name(title, title)
return command
class DjangoStandaloneHTMLBuilder(StandaloneHTMLBuilder):
"""
Subclass to add some extra things we need.
"""
name = 'djangohtml'
def finish(self):
super().finish()
logger.info(bold("writing templatebuiltins.js..."))
xrefs = self.env.domaindata["std"]["objects"]
templatebuiltins = {
"ttags": [
n for ((t, n), (k, a)) in xrefs.items()
if t == "templatetag" and k == "ref/templates/builtins"
],
"tfilters": [
n for ((t, n), (k, a)) in xrefs.items()
if t == "templatefilter" and k == "ref/templates/builtins"
],
}
outfilename = os.path.join(self.outdir, "templatebuiltins.js")
with open(outfilename, 'w') as fp:
fp.write('var django_template_builtins = ')
json.dump(templatebuiltins, fp)
fp.write(';\n')
class ConsoleNode(nodes.literal_block):
"""
Custom node to override the visit/depart event handlers at registration
time. Wrap a literal_block object and defer to it.
"""
tagname = 'ConsoleNode'
def __init__(self, litblk_obj):
self.wrapped = litblk_obj
def __getattr__(self, attr):
if attr == 'wrapped':
return self.__dict__.wrapped
return getattr(self.wrapped, attr)
def visit_console_dummy(self, node):
"""Defer to the corresponding parent's handler."""
self.visit_literal_block(node)
def depart_console_dummy(self, node):
"""Defer to the corresponding parent's handler."""
self.depart_literal_block(node)
def visit_console_html(self, node):
"""Generate HTML for the console directive."""
if self.builder.name in ('djangohtml', 'json') and node['win_console_text']:
# Put a mark on the document object signaling the fact the directive
# has been used on it.
self.document._console_directive_used_flag = True
uid = node['uid']
self.body.append('''\
<div class="console-block" id="console-block-%(id)s">
<input class="c-tab-unix" id="c-tab-%(id)s-unix" type="radio" name="console-%(id)s" checked>
<label for="c-tab-%(id)s-unix" title="Linux/macOS">/</label>
<input class="c-tab-win" id="c-tab-%(id)s-win" type="radio" name="console-%(id)s">
<label for="c-tab-%(id)s-win" title="Windows"></label>
<section class="c-content-unix" id="c-content-%(id)s-unix">\n''' % {'id': uid})
try:
self.visit_literal_block(node)
except nodes.SkipNode:
pass
self.body.append('</section>\n')
self.body.append('<section class="c-content-win" id="c-content-%(id)s-win">\n' % {'id': uid})
win_text = node['win_console_text']
highlight_args = {'force': True}
linenos = node.get('linenos', False)
def warner(msg):
self.builder.warn(msg, (self.builder.current_docname, node.line))
highlighted = self.highlighter.highlight_block(
win_text, 'doscon', warn=warner, linenos=linenos, **highlight_args
)
self.body.append(highlighted)
self.body.append('</section>\n')
self.body.append('</div>\n')
raise nodes.SkipNode
else:
self.visit_literal_block(node)
class ConsoleDirective(CodeBlock):
"""
A reStructuredText directive which renders a two-tab code block in which
the second tab shows a Windows command line equivalent of the usual
Unix-oriented examples.
"""
required_arguments = 0
# The 'doscon' Pygments formatter needs a prompt like this. '>' alone
# won't do it because then it simply paints the whole command line as a
# grey comment with no highlighting at all.
WIN_PROMPT = r'...\> '
def run(self):
def args_to_win(cmdline):
changed = False
out = []
for token in cmdline.split():
if token[:2] == './':
token = token[2:]
changed = True
elif token[:2] == '~/':
token = '%HOMEPATH%\\' + token[2:]
changed = True
elif token == 'make':
token = 'make.bat'
changed = True
if '://' not in token and 'git' not in cmdline:
out.append(token.replace('/', '\\'))
changed = True
else:
out.append(token)
if changed:
return ' '.join(out)
return cmdline
def cmdline_to_win(line):
if line.startswith('# '):
return 'REM ' + args_to_win(line[2:])
if line.startswith('$ # '):
return 'REM ' + args_to_win(line[4:])
if line.startswith('$ ./manage.py'):
return 'manage.py ' + args_to_win(line[13:])
if line.startswith('$ manage.py'):
return 'manage.py ' + args_to_win(line[11:])
if line.startswith('$ ./runtests.py'):
return 'runtests.py ' + args_to_win(line[15:])
if line.startswith('$ ./'):
return args_to_win(line[4:])
if line.startswith('$ python3'):
return 'py ' + args_to_win(line[9:])
if line.startswith('$ python'):
return 'py ' + args_to_win(line[8:])
if line.startswith('$ '):
return args_to_win(line[2:])
return None
def code_block_to_win(content):
bchanged = False
lines = []
for line in content:
modline = cmdline_to_win(line)
if modline is None:
lines.append(line)
else:
lines.append(self.WIN_PROMPT + modline)
bchanged = True
if bchanged:
return ViewList(lines)
return None
env = self.state.document.settings.env
self.arguments = ['console']
lit_blk_obj = super().run()[0]
# Only do work when the djangohtml HTML Sphinx builder is being used,
# invoke the default behavior for the rest.
if env.app.builder.name not in ('djangohtml', 'json'):
return [lit_blk_obj]
lit_blk_obj['uid'] = str(env.new_serialno('console'))
# Only add the tabbed UI if there is actually a Windows-specific
# version of the CLI example.
win_content = code_block_to_win(self.content)
if win_content is None:
lit_blk_obj['win_console_text'] = None
else:
self.content = win_content
lit_blk_obj['win_console_text'] = super().run()[0].rawsource
# Replace the literal_node object returned by Sphinx's CodeBlock with
# the ConsoleNode wrapper.
return [ConsoleNode(lit_blk_obj)]
def html_page_context_hook(app, pagename, templatename, context, doctree):
# Put a bool on the context used to render the template. It's used to
# control inclusion of console-tabs.css and activation of the JavaScript.
# This way it's include only from HTML files rendered from reST files where
# the ConsoleDirective is used.
context['include_console_assets'] = getattr(doctree, '_console_directive_used_flag', False)
def default_role_error(
name, rawtext, text, lineno, inliner, options=None, content=None
):
msg = (
"Default role used (`single backticks`) at line %s: %s. Did you mean "
"to use two backticks for ``code``, or miss an underscore for a "
"`link`_ ?" % (lineno, rawtext)
)
raise SphinxError(red(msg))
|
af07033a6e5b3000b436fe9e9af8118f4deff790d5f0d6f6fbe6967086ec4e67 | """
Django's standard crypto functions and utilities.
"""
import hashlib
import hmac
import secrets
from django.conf import settings
from django.utils.encoding import force_bytes
def salted_hmac(key_salt, value, secret=None):
"""
Return the HMAC-SHA1 of 'value', using a key generated from key_salt and a
secret (which defaults to settings.SECRET_KEY).
A different key_salt should be passed in for every application of HMAC.
"""
if secret is None:
secret = settings.SECRET_KEY
key_salt = force_bytes(key_salt)
secret = force_bytes(secret)
# We need to generate a derived key from our base key. We can do this by
# passing the key_salt and our base key through a pseudo-random function and
# SHA1 works nicely.
key = hashlib.sha1(key_salt + secret).digest()
# If len(key_salt + secret) > block size of the hash algorithm, the above
# line is redundant and could be replaced by key = key_salt + secret, since
# the hmac module does the same thing for keys longer than the block size.
# However, we need to ensure that we *always* do this.
return hmac.new(key, msg=force_bytes(value), digestmod=hashlib.sha1)
def get_random_string(length=12,
allowed_chars='abcdefghijklmnopqrstuvwxyz'
'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'):
"""
Return a securely generated random string.
The default length of 12 with the a-z, A-Z, 0-9 character set returns
a 71-bit value. log_2((26+26+10)^12) =~ 71 bits
"""
return ''.join(secrets.choice(allowed_chars) for i in range(length))
def constant_time_compare(val1, val2):
"""Return True if the two strings are equal, False otherwise."""
return secrets.compare_digest(force_bytes(val1), force_bytes(val2))
def pbkdf2(password, salt, iterations, dklen=0, digest=None):
"""Return the hash of password using pbkdf2."""
if digest is None:
digest = hashlib.sha256
dklen = dklen or None
password = force_bytes(password)
salt = force_bytes(salt)
return hashlib.pbkdf2_hmac(digest().name, password, salt, iterations, dklen)
|
96ac7afbdcca9dde6e22581d79134b86a73e8b86df0e962449407bc22943eaf4 | import copy
import inspect
import warnings
from functools import partialmethod
from itertools import chain
from django.apps import apps
from django.conf import settings
from django.core import checks
from django.core.exceptions import (
NON_FIELD_ERRORS, FieldDoesNotExist, FieldError, MultipleObjectsReturned,
ObjectDoesNotExist, ValidationError,
)
from django.db import (
DEFAULT_DB_ALIAS, DJANGO_VERSION_PICKLE_KEY, DatabaseError, connection,
connections, router, transaction,
)
from django.db.models import (
NOT_PROVIDED, ExpressionWrapper, IntegerField, Max, Value,
)
from django.db.models.constants import LOOKUP_SEP
from django.db.models.constraints import CheckConstraint, UniqueConstraint
from django.db.models.deletion import CASCADE, Collector
from django.db.models.fields.related import (
ForeignObjectRel, OneToOneField, lazy_related_operation, resolve_relation,
)
from django.db.models.functions import Coalesce
from django.db.models.manager import Manager
from django.db.models.options import Options
from django.db.models.query import Q
from django.db.models.signals import (
class_prepared, post_init, post_save, pre_init, pre_save,
)
from django.db.models.utils import make_model_tuple
from django.utils.encoding import force_str
from django.utils.hashable import make_hashable
from django.utils.text import capfirst, get_text_list
from django.utils.translation import gettext_lazy as _
from django.utils.version import get_version
class Deferred:
def __repr__(self):
return '<Deferred field>'
def __str__(self):
return '<Deferred field>'
DEFERRED = Deferred()
def subclass_exception(name, bases, module, attached_to):
"""
Create exception subclass. Used by ModelBase below.
The exception is created in a way that allows it to be pickled, assuming
that the returned exception class will be added as an attribute to the
'attached_to' class.
"""
return type(name, bases, {
'__module__': module,
'__qualname__': '%s.%s' % (attached_to.__qualname__, name),
})
def _has_contribute_to_class(value):
# Only call contribute_to_class() if it's bound.
return not inspect.isclass(value) and hasattr(value, 'contribute_to_class')
class ModelBase(type):
"""Metaclass for all models."""
def __new__(cls, name, bases, attrs, **kwargs):
super_new = super().__new__
# Also ensure initialization is only performed for subclasses of Model
# (excluding Model class itself).
parents = [b for b in bases if isinstance(b, ModelBase)]
if not parents:
return super_new(cls, name, bases, attrs)
# Create the class.
module = attrs.pop('__module__')
new_attrs = {'__module__': module}
classcell = attrs.pop('__classcell__', None)
if classcell is not None:
new_attrs['__classcell__'] = classcell
attr_meta = attrs.pop('Meta', None)
# Pass all attrs without a (Django-specific) contribute_to_class()
# method to type.__new__() so that they're properly initialized
# (i.e. __set_name__()).
contributable_attrs = {}
for obj_name, obj in list(attrs.items()):
if _has_contribute_to_class(obj):
contributable_attrs[obj_name] = obj
else:
new_attrs[obj_name] = obj
new_class = super_new(cls, name, bases, new_attrs, **kwargs)
abstract = getattr(attr_meta, 'abstract', False)
meta = attr_meta or getattr(new_class, 'Meta', None)
base_meta = getattr(new_class, '_meta', None)
app_label = None
# Look for an application configuration to attach the model to.
app_config = apps.get_containing_app_config(module)
if getattr(meta, 'app_label', None) is None:
if app_config is None:
if not abstract:
raise RuntimeError(
"Model class %s.%s doesn't declare an explicit "
"app_label and isn't in an application in "
"INSTALLED_APPS." % (module, name)
)
else:
app_label = app_config.label
new_class.add_to_class('_meta', Options(meta, app_label))
if not abstract:
new_class.add_to_class(
'DoesNotExist',
subclass_exception(
'DoesNotExist',
tuple(
x.DoesNotExist for x in parents if hasattr(x, '_meta') and not x._meta.abstract
) or (ObjectDoesNotExist,),
module,
attached_to=new_class))
new_class.add_to_class(
'MultipleObjectsReturned',
subclass_exception(
'MultipleObjectsReturned',
tuple(
x.MultipleObjectsReturned for x in parents if hasattr(x, '_meta') and not x._meta.abstract
) or (MultipleObjectsReturned,),
module,
attached_to=new_class))
if base_meta and not base_meta.abstract:
# Non-abstract child classes inherit some attributes from their
# non-abstract parent (unless an ABC comes before it in the
# method resolution order).
if not hasattr(meta, 'ordering'):
new_class._meta.ordering = base_meta.ordering
if not hasattr(meta, 'get_latest_by'):
new_class._meta.get_latest_by = base_meta.get_latest_by
is_proxy = new_class._meta.proxy
# If the model is a proxy, ensure that the base class
# hasn't been swapped out.
if is_proxy and base_meta and base_meta.swapped:
raise TypeError("%s cannot proxy the swapped model '%s'." % (name, base_meta.swapped))
# Add remaining attributes (those with a contribute_to_class() method)
# to the class.
for obj_name, obj in contributable_attrs.items():
new_class.add_to_class(obj_name, obj)
# All the fields of any type declared on this model
new_fields = chain(
new_class._meta.local_fields,
new_class._meta.local_many_to_many,
new_class._meta.private_fields
)
field_names = {f.name for f in new_fields}
# Basic setup for proxy models.
if is_proxy:
base = None
for parent in [kls for kls in parents if hasattr(kls, '_meta')]:
if parent._meta.abstract:
if parent._meta.fields:
raise TypeError(
"Abstract base class containing model fields not "
"permitted for proxy model '%s'." % name
)
else:
continue
if base is None:
base = parent
elif parent._meta.concrete_model is not base._meta.concrete_model:
raise TypeError("Proxy model '%s' has more than one non-abstract model base class." % name)
if base is None:
raise TypeError("Proxy model '%s' has no non-abstract model base class." % name)
new_class._meta.setup_proxy(base)
new_class._meta.concrete_model = base._meta.concrete_model
else:
new_class._meta.concrete_model = new_class
# Collect the parent links for multi-table inheritance.
parent_links = {}
for base in reversed([new_class] + parents):
# Conceptually equivalent to `if base is Model`.
if not hasattr(base, '_meta'):
continue
# Skip concrete parent classes.
if base != new_class and not base._meta.abstract:
continue
# Locate OneToOneField instances.
for field in base._meta.local_fields:
if isinstance(field, OneToOneField):
related = resolve_relation(new_class, field.remote_field.model)
parent_links[make_model_tuple(related)] = field
# Track fields inherited from base models.
inherited_attributes = set()
# Do the appropriate setup for any model parents.
for base in new_class.mro():
if base not in parents or not hasattr(base, '_meta'):
# Things without _meta aren't functional models, so they're
# uninteresting parents.
inherited_attributes.update(base.__dict__)
continue
parent_fields = base._meta.local_fields + base._meta.local_many_to_many
if not base._meta.abstract:
# Check for clashes between locally declared fields and those
# on the base classes.
for field in parent_fields:
if field.name in field_names:
raise FieldError(
'Local field %r in class %r clashes with field of '
'the same name from base class %r.' % (
field.name,
name,
base.__name__,
)
)
else:
inherited_attributes.add(field.name)
# Concrete classes...
base = base._meta.concrete_model
base_key = make_model_tuple(base)
if base_key in parent_links:
field = parent_links[base_key]
elif not is_proxy:
attr_name = '%s_ptr' % base._meta.model_name
field = OneToOneField(
base,
on_delete=CASCADE,
name=attr_name,
auto_created=True,
parent_link=True,
)
if attr_name in field_names:
raise FieldError(
"Auto-generated field '%s' in class %r for "
"parent_link to base class %r clashes with "
"declared field of the same name." % (
attr_name,
name,
base.__name__,
)
)
# Only add the ptr field if it's not already present;
# e.g. migrations will already have it specified
if not hasattr(new_class, attr_name):
new_class.add_to_class(attr_name, field)
else:
field = None
new_class._meta.parents[base] = field
else:
base_parents = base._meta.parents.copy()
# Add fields from abstract base class if it wasn't overridden.
for field in parent_fields:
if (field.name not in field_names and
field.name not in new_class.__dict__ and
field.name not in inherited_attributes):
new_field = copy.deepcopy(field)
new_class.add_to_class(field.name, new_field)
# Replace parent links defined on this base by the new
# field. It will be appropriately resolved if required.
if field.one_to_one:
for parent, parent_link in base_parents.items():
if field == parent_link:
base_parents[parent] = new_field
# Pass any non-abstract parent classes onto child.
new_class._meta.parents.update(base_parents)
# Inherit private fields (like GenericForeignKey) from the parent
# class
for field in base._meta.private_fields:
if field.name in field_names:
if not base._meta.abstract:
raise FieldError(
'Local field %r in class %r clashes with field of '
'the same name from base class %r.' % (
field.name,
name,
base.__name__,
)
)
else:
field = copy.deepcopy(field)
if not base._meta.abstract:
field.mti_inherited = True
new_class.add_to_class(field.name, field)
# Copy indexes so that index names are unique when models extend an
# abstract model.
new_class._meta.indexes = [copy.deepcopy(idx) for idx in new_class._meta.indexes]
if abstract:
# Abstract base models can't be instantiated and don't appear in
# the list of models for an app. We do the final setup for them a
# little differently from normal models.
attr_meta.abstract = False
new_class.Meta = attr_meta
return new_class
new_class._prepare()
new_class._meta.apps.register_model(new_class._meta.app_label, new_class)
return new_class
def add_to_class(cls, name, value):
if _has_contribute_to_class(value):
value.contribute_to_class(cls, name)
else:
setattr(cls, name, value)
def _prepare(cls):
"""Create some methods once self._meta has been populated."""
opts = cls._meta
opts._prepare(cls)
if opts.order_with_respect_to:
cls.get_next_in_order = partialmethod(cls._get_next_or_previous_in_order, is_next=True)
cls.get_previous_in_order = partialmethod(cls._get_next_or_previous_in_order, is_next=False)
# Defer creating accessors on the foreign class until it has been
# created and registered. If remote_field is None, we're ordering
# with respect to a GenericForeignKey and don't know what the
# foreign class is - we'll add those accessors later in
# contribute_to_class().
if opts.order_with_respect_to.remote_field:
wrt = opts.order_with_respect_to
remote = wrt.remote_field.model
lazy_related_operation(make_foreign_order_accessors, cls, remote)
# Give the class a docstring -- its definition.
if cls.__doc__ is None:
cls.__doc__ = "%s(%s)" % (cls.__name__, ", ".join(f.name for f in opts.fields))
get_absolute_url_override = settings.ABSOLUTE_URL_OVERRIDES.get(opts.label_lower)
if get_absolute_url_override:
setattr(cls, 'get_absolute_url', get_absolute_url_override)
if not opts.managers:
if any(f.name == 'objects' for f in opts.fields):
raise ValueError(
"Model %s must specify a custom Manager, because it has a "
"field named 'objects'." % cls.__name__
)
manager = Manager()
manager.auto_created = True
cls.add_to_class('objects', manager)
# Set the name of _meta.indexes. This can't be done in
# Options.contribute_to_class() because fields haven't been added to
# the model at that point.
for index in cls._meta.indexes:
if not index.name:
index.set_name_with_model(cls)
class_prepared.send(sender=cls)
@property
def _base_manager(cls):
return cls._meta.base_manager
@property
def _default_manager(cls):
return cls._meta.default_manager
class ModelStateFieldsCacheDescriptor:
def __get__(self, instance, cls=None):
if instance is None:
return self
res = instance.fields_cache = {}
return res
class ModelState:
"""Store model instance state."""
db = None
# If true, uniqueness validation checks will consider this a new, unsaved
# object. Necessary for correct validation of new instances of objects with
# explicit (non-auto) PKs. This impacts validation only; it has no effect
# on the actual save.
adding = True
fields_cache = ModelStateFieldsCacheDescriptor()
class Model(metaclass=ModelBase):
def __init__(self, *args, **kwargs):
# Alias some things as locals to avoid repeat global lookups
cls = self.__class__
opts = self._meta
_setattr = setattr
_DEFERRED = DEFERRED
pre_init.send(sender=cls, args=args, kwargs=kwargs)
# Set up the storage for instance state
self._state = ModelState()
# There is a rather weird disparity here; if kwargs, it's set, then args
# overrides it. It should be one or the other; don't duplicate the work
# The reason for the kwargs check is that standard iterator passes in by
# args, and instantiation for iteration is 33% faster.
if len(args) > len(opts.concrete_fields):
# Daft, but matches old exception sans the err msg.
raise IndexError("Number of args exceeds number of fields")
if not kwargs:
fields_iter = iter(opts.concrete_fields)
# The ordering of the zip calls matter - zip throws StopIteration
# when an iter throws it. So if the first iter throws it, the second
# is *not* consumed. We rely on this, so don't change the order
# without changing the logic.
for val, field in zip(args, fields_iter):
if val is _DEFERRED:
continue
_setattr(self, field.attname, val)
else:
# Slower, kwargs-ready version.
fields_iter = iter(opts.fields)
for val, field in zip(args, fields_iter):
if val is _DEFERRED:
continue
_setattr(self, field.attname, val)
kwargs.pop(field.name, None)
# Now we're left with the unprocessed fields that *must* come from
# keywords, or default.
for field in fields_iter:
is_related_object = False
# Virtual field
if field.attname not in kwargs and field.column is None:
continue
if kwargs:
if isinstance(field.remote_field, ForeignObjectRel):
try:
# Assume object instance was passed in.
rel_obj = kwargs.pop(field.name)
is_related_object = True
except KeyError:
try:
# Object instance wasn't passed in -- must be an ID.
val = kwargs.pop(field.attname)
except KeyError:
val = field.get_default()
else:
try:
val = kwargs.pop(field.attname)
except KeyError:
# This is done with an exception rather than the
# default argument on pop because we don't want
# get_default() to be evaluated, and then not used.
# Refs #12057.
val = field.get_default()
else:
val = field.get_default()
if is_related_object:
# If we are passed a related instance, set it using the
# field.name instead of field.attname (e.g. "user" instead of
# "user_id") so that the object gets properly cached (and type
# checked) by the RelatedObjectDescriptor.
if rel_obj is not _DEFERRED:
_setattr(self, field.name, rel_obj)
else:
if val is not _DEFERRED:
_setattr(self, field.attname, val)
if kwargs:
property_names = opts._property_names
for prop in tuple(kwargs):
try:
# Any remaining kwargs must correspond to properties or
# virtual fields.
if prop in property_names or opts.get_field(prop):
if kwargs[prop] is not _DEFERRED:
_setattr(self, prop, kwargs[prop])
del kwargs[prop]
except (AttributeError, FieldDoesNotExist):
pass
for kwarg in kwargs:
raise TypeError("%s() got an unexpected keyword argument '%s'" % (cls.__name__, kwarg))
super().__init__()
post_init.send(sender=cls, instance=self)
@classmethod
def from_db(cls, db, field_names, values):
if len(values) != len(cls._meta.concrete_fields):
values_iter = iter(values)
values = [
next(values_iter) if f.attname in field_names else DEFERRED
for f in cls._meta.concrete_fields
]
new = cls(*values)
new._state.adding = False
new._state.db = db
return new
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self)
def __str__(self):
return '%s object (%s)' % (self.__class__.__name__, self.pk)
def __eq__(self, other):
if not isinstance(other, Model):
return NotImplemented
if self._meta.concrete_model != other._meta.concrete_model:
return False
my_pk = self.pk
if my_pk is None:
return self is other
return my_pk == other.pk
def __hash__(self):
if self.pk is None:
raise TypeError("Model instances without primary key value are unhashable")
return hash(self.pk)
def __reduce__(self):
data = self.__getstate__()
data[DJANGO_VERSION_PICKLE_KEY] = get_version()
class_id = self._meta.app_label, self._meta.object_name
return model_unpickle, (class_id,), data
def __getstate__(self):
"""Hook to allow choosing the attributes to pickle."""
return self.__dict__
def __setstate__(self, state):
msg = None
pickled_version = state.get(DJANGO_VERSION_PICKLE_KEY)
if pickled_version:
current_version = get_version()
if current_version != pickled_version:
msg = (
"Pickled model instance's Django version %s does not match "
"the current version %s." % (pickled_version, current_version)
)
else:
msg = "Pickled model instance's Django version is not specified."
if msg:
warnings.warn(msg, RuntimeWarning, stacklevel=2)
self.__dict__.update(state)
def _get_pk_val(self, meta=None):
meta = meta or self._meta
return getattr(self, meta.pk.attname)
def _set_pk_val(self, value):
for parent_link in self._meta.parents.values():
if parent_link and parent_link != self._meta.pk:
setattr(self, parent_link.target_field.attname, value)
return setattr(self, self._meta.pk.attname, value)
pk = property(_get_pk_val, _set_pk_val)
def get_deferred_fields(self):
"""
Return a set containing names of deferred fields for this instance.
"""
return {
f.attname for f in self._meta.concrete_fields
if f.attname not in self.__dict__
}
def refresh_from_db(self, using=None, fields=None):
"""
Reload field values from the database.
By default, the reloading happens from the database this instance was
loaded from, or by the read router if this instance wasn't loaded from
any database. The using parameter will override the default.
Fields can be used to specify which fields to reload. The fields
should be an iterable of field attnames. If fields is None, then
all non-deferred fields are reloaded.
When accessing deferred fields of an instance, the deferred loading
of the field will call this method.
"""
if fields is None:
self._prefetched_objects_cache = {}
else:
prefetched_objects_cache = getattr(self, '_prefetched_objects_cache', ())
for field in fields:
if field in prefetched_objects_cache:
del prefetched_objects_cache[field]
fields.remove(field)
if not fields:
return
if any(LOOKUP_SEP in f for f in fields):
raise ValueError(
'Found "%s" in fields argument. Relations and transforms '
'are not allowed in fields.' % LOOKUP_SEP)
hints = {'instance': self}
db_instance_qs = self.__class__._base_manager.db_manager(using, hints=hints).filter(pk=self.pk)
# Use provided fields, if not set then reload all non-deferred fields.
deferred_fields = self.get_deferred_fields()
if fields is not None:
fields = list(fields)
db_instance_qs = db_instance_qs.only(*fields)
elif deferred_fields:
fields = [f.attname for f in self._meta.concrete_fields
if f.attname not in deferred_fields]
db_instance_qs = db_instance_qs.only(*fields)
db_instance = db_instance_qs.get()
non_loaded_fields = db_instance.get_deferred_fields()
for field in self._meta.concrete_fields:
if field.attname in non_loaded_fields:
# This field wasn't refreshed - skip ahead.
continue
setattr(self, field.attname, getattr(db_instance, field.attname))
# Clear cached foreign keys.
if field.is_relation and field.is_cached(self):
field.delete_cached_value(self)
# Clear cached relations.
for field in self._meta.related_objects:
if field.is_cached(self):
field.delete_cached_value(self)
self._state.db = db_instance._state.db
def serializable_value(self, field_name):
"""
Return the value of the field name for this instance. If the field is
a foreign key, return the id value instead of the object. If there's
no Field object with this name on the model, return the model
attribute's value.
Used to serialize a field's value (in the serializer, or form output,
for example). Normally, you would just access the attribute directly
and not use this method.
"""
try:
field = self._meta.get_field(field_name)
except FieldDoesNotExist:
return getattr(self, field_name)
return getattr(self, field.attname)
def save(self, force_insert=False, force_update=False, using=None,
update_fields=None):
"""
Save the current instance. Override this in a subclass if you want to
control the saving process.
The 'force_insert' and 'force_update' parameters can be used to insist
that the "save" must be an SQL insert or update (or equivalent for
non-SQL backends), respectively. Normally, they should not be set.
"""
# Ensure that a model instance without a PK hasn't been assigned to
# a ForeignKey or OneToOneField on this model. If the field is
# nullable, allowing the save() would result in silent data loss.
for field in self._meta.concrete_fields:
# If the related field isn't cached, then an instance hasn't
# been assigned and there's no need to worry about this check.
if field.is_relation and field.is_cached(self):
obj = getattr(self, field.name, None)
if not obj:
continue
# A pk may have been assigned manually to a model instance not
# saved to the database (or auto-generated in a case like
# UUIDField), but we allow the save to proceed and rely on the
# database to raise an IntegrityError if applicable. If
# constraints aren't supported by the database, there's the
# unavoidable risk of data corruption.
if obj.pk is None:
# Remove the object from a related instance cache.
if not field.remote_field.multiple:
field.remote_field.delete_cached_value(obj)
raise ValueError(
"save() prohibited to prevent data loss due to "
"unsaved related object '%s'." % field.name
)
elif getattr(self, field.attname) is None:
# Use pk from related object if it has been saved after
# an assignment.
setattr(self, field.attname, obj.pk)
# If the relationship's pk/to_field was changed, clear the
# cached relationship.
if getattr(obj, field.target_field.attname) != getattr(self, field.attname):
field.delete_cached_value(self)
using = using or router.db_for_write(self.__class__, instance=self)
if force_insert and (force_update or update_fields):
raise ValueError("Cannot force both insert and updating in model saving.")
deferred_fields = self.get_deferred_fields()
if update_fields is not None:
# If update_fields is empty, skip the save. We do also check for
# no-op saves later on for inheritance cases. This bailout is
# still needed for skipping signal sending.
if not update_fields:
return
update_fields = frozenset(update_fields)
field_names = set()
for field in self._meta.fields:
if not field.primary_key:
field_names.add(field.name)
if field.name != field.attname:
field_names.add(field.attname)
non_model_fields = update_fields.difference(field_names)
if non_model_fields:
raise ValueError("The following fields do not exist in this "
"model or are m2m fields: %s"
% ', '.join(non_model_fields))
# If saving to the same database, and this model is deferred, then
# automatically do an "update_fields" save on the loaded fields.
elif not force_insert and deferred_fields and using == self._state.db:
field_names = set()
for field in self._meta.concrete_fields:
if not field.primary_key and not hasattr(field, 'through'):
field_names.add(field.attname)
loaded_fields = field_names.difference(deferred_fields)
if loaded_fields:
update_fields = frozenset(loaded_fields)
self.save_base(using=using, force_insert=force_insert,
force_update=force_update, update_fields=update_fields)
save.alters_data = True
def save_base(self, raw=False, force_insert=False,
force_update=False, using=None, update_fields=None):
"""
Handle the parts of saving which should be done only once per save,
yet need to be done in raw saves, too. This includes some sanity
checks and signal sending.
The 'raw' argument is telling save_base not to save any parent
models and not to do any changes to the values before save. This
is used by fixture loading.
"""
using = using or router.db_for_write(self.__class__, instance=self)
assert not (force_insert and (force_update or update_fields))
assert update_fields is None or update_fields
cls = origin = self.__class__
# Skip proxies, but keep the origin as the proxy model.
if cls._meta.proxy:
cls = cls._meta.concrete_model
meta = cls._meta
if not meta.auto_created:
pre_save.send(
sender=origin, instance=self, raw=raw, using=using,
update_fields=update_fields,
)
# A transaction isn't needed if one query is issued.
if meta.parents:
context_manager = transaction.atomic(using=using, savepoint=False)
else:
context_manager = transaction.mark_for_rollback_on_error(using=using)
with context_manager:
parent_inserted = False
if not raw:
parent_inserted = self._save_parents(cls, using, update_fields)
updated = self._save_table(
raw, cls, force_insert or parent_inserted,
force_update, using, update_fields,
)
# Store the database on which the object was saved
self._state.db = using
# Once saved, this is no longer a to-be-added instance.
self._state.adding = False
# Signal that the save is complete
if not meta.auto_created:
post_save.send(
sender=origin, instance=self, created=(not updated),
update_fields=update_fields, raw=raw, using=using,
)
save_base.alters_data = True
def _save_parents(self, cls, using, update_fields):
"""Save all the parents of cls using values from self."""
meta = cls._meta
inserted = False
for parent, field in meta.parents.items():
# Make sure the link fields are synced between parent and self.
if (field and getattr(self, parent._meta.pk.attname) is None and
getattr(self, field.attname) is not None):
setattr(self, parent._meta.pk.attname, getattr(self, field.attname))
parent_inserted = self._save_parents(cls=parent, using=using, update_fields=update_fields)
updated = self._save_table(
cls=parent, using=using, update_fields=update_fields,
force_insert=parent_inserted,
)
if not updated:
inserted = True
# Set the parent's PK value to self.
if field:
setattr(self, field.attname, self._get_pk_val(parent._meta))
# Since we didn't have an instance of the parent handy set
# attname directly, bypassing the descriptor. Invalidate
# the related object cache, in case it's been accidentally
# populated. A fresh instance will be re-built from the
# database if necessary.
if field.is_cached(self):
field.delete_cached_value(self)
return inserted
def _save_table(self, raw=False, cls=None, force_insert=False,
force_update=False, using=None, update_fields=None):
"""
Do the heavy-lifting involved in saving. Update or insert the data
for a single table.
"""
meta = cls._meta
non_pks = [f for f in meta.local_concrete_fields if not f.primary_key]
if update_fields:
non_pks = [f for f in non_pks
if f.name in update_fields or f.attname in update_fields]
pk_val = self._get_pk_val(meta)
if pk_val is None:
pk_val = meta.pk.get_pk_value_on_save(self)
setattr(self, meta.pk.attname, pk_val)
pk_set = pk_val is not None
if not pk_set and (force_update or update_fields):
raise ValueError("Cannot force an update in save() with no primary key.")
updated = False
# Skip an UPDATE when adding an instance and primary key has a default.
if (
not raw and
not force_insert and
self._state.adding and
self._meta.pk.default and
self._meta.pk.default is not NOT_PROVIDED
):
force_insert = True
# If possible, try an UPDATE. If that doesn't update anything, do an INSERT.
if pk_set and not force_insert:
base_qs = cls._base_manager.using(using)
values = [(f, None, (getattr(self, f.attname) if raw else f.pre_save(self, False)))
for f in non_pks]
forced_update = update_fields or force_update
updated = self._do_update(base_qs, using, pk_val, values, update_fields,
forced_update)
if force_update and not updated:
raise DatabaseError("Forced update did not affect any rows.")
if update_fields and not updated:
raise DatabaseError("Save with update_fields did not affect any rows.")
if not updated:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
filter_args = field.get_filter_kwargs_for_object(self)
self._order = cls._base_manager.using(using).filter(**filter_args).aggregate(
_order__max=Coalesce(
ExpressionWrapper(Max('_order') + Value(1), output_field=IntegerField()),
Value(0),
),
)['_order__max']
fields = meta.local_concrete_fields
if not pk_set:
fields = [f for f in fields if f is not meta.auto_field]
returning_fields = meta.db_returning_fields
results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
for result, field in zip(results, returning_fields):
setattr(self, field.attname, result)
return updated
def _do_update(self, base_qs, using, pk_val, values, update_fields, forced_update):
"""
Try to update the model. Return True if the model was updated (if an
update query was done and a matching row was found in the DB).
"""
filtered = base_qs.filter(pk=pk_val)
if not values:
# We can end up here when saving a model in inheritance chain where
# update_fields doesn't target any field in current model. In that
# case we just say the update succeeded. Another case ending up here
# is a model with just PK - in that case check that the PK still
# exists.
return update_fields is not None or filtered.exists()
if self._meta.select_on_save and not forced_update:
return (
filtered.exists() and
# It may happen that the object is deleted from the DB right after
# this check, causing the subsequent UPDATE to return zero matching
# rows. The same result can occur in some rare cases when the
# database returns zero despite the UPDATE being executed
# successfully (a row is matched and updated). In order to
# distinguish these two cases, the object's existence in the
# database is again checked for if the UPDATE query returns 0.
(filtered._update(values) > 0 or filtered.exists())
)
return filtered._update(values) > 0
def _do_insert(self, manager, using, fields, returning_fields, raw):
"""
Do an INSERT. If returning_fields is defined then this method should
return the newly created data for the model.
"""
return manager._insert(
[self], fields=fields, returning_fields=returning_fields,
using=using, raw=raw,
)
def delete(self, using=None, keep_parents=False):
using = using or router.db_for_write(self.__class__, instance=self)
assert self.pk is not None, (
"%s object can't be deleted because its %s attribute is set to None." %
(self._meta.object_name, self._meta.pk.attname)
)
collector = Collector(using=using)
collector.collect([self], keep_parents=keep_parents)
return collector.delete()
delete.alters_data = True
def _get_FIELD_display(self, field):
value = getattr(self, field.attname)
choices_dict = dict(make_hashable(field.flatchoices))
# force_str() to coerce lazy strings.
return force_str(choices_dict.get(make_hashable(value), value), strings_only=True)
def _get_next_or_previous_by_FIELD(self, field, is_next, **kwargs):
if not self.pk:
raise ValueError("get_next/get_previous cannot be used on unsaved objects.")
op = 'gt' if is_next else 'lt'
order = '' if is_next else '-'
param = getattr(self, field.attname)
q = Q(**{'%s__%s' % (field.name, op): param})
q = q | Q(**{field.name: param, 'pk__%s' % op: self.pk})
qs = self.__class__._default_manager.using(self._state.db).filter(**kwargs).filter(q).order_by(
'%s%s' % (order, field.name), '%spk' % order
)
try:
return qs[0]
except IndexError:
raise self.DoesNotExist("%s matching query does not exist." % self.__class__._meta.object_name)
def _get_next_or_previous_in_order(self, is_next):
cachename = "__%s_order_cache" % is_next
if not hasattr(self, cachename):
op = 'gt' if is_next else 'lt'
order = '_order' if is_next else '-_order'
order_field = self._meta.order_with_respect_to
filter_args = order_field.get_filter_kwargs_for_object(self)
obj = self.__class__._default_manager.filter(**filter_args).filter(**{
'_order__%s' % op: self.__class__._default_manager.values('_order').filter(**{
self._meta.pk.name: self.pk
})
}).order_by(order)[:1].get()
setattr(self, cachename, obj)
return getattr(self, cachename)
def prepare_database_save(self, field):
if self.pk is None:
raise ValueError("Unsaved model instance %r cannot be used in an ORM query." % self)
return getattr(self, field.remote_field.get_related_field().attname)
def clean(self):
"""
Hook for doing any extra model-wide validation after clean() has been
called on every field by self.clean_fields. Any ValidationError raised
by this method will not be associated with a particular field; it will
have a special-case association with the field defined by NON_FIELD_ERRORS.
"""
pass
def validate_unique(self, exclude=None):
"""
Check unique constraints on the model and raise ValidationError if any
failed.
"""
unique_checks, date_checks = self._get_unique_checks(exclude=exclude)
errors = self._perform_unique_checks(unique_checks)
date_errors = self._perform_date_checks(date_checks)
for k, v in date_errors.items():
errors.setdefault(k, []).extend(v)
if errors:
raise ValidationError(errors)
def _get_unique_checks(self, exclude=None):
"""
Return a list of checks to perform. Since validate_unique() could be
called from a ModelForm, some fields may have been excluded; we can't
perform a unique check on a model that is missing fields involved
in that check. Fields that did not validate should also be excluded,
but they need to be passed in via the exclude argument.
"""
if exclude is None:
exclude = []
unique_checks = []
unique_togethers = [(self.__class__, self._meta.unique_together)]
constraints = [(self.__class__, self._meta.constraints)]
for parent_class in self._meta.get_parent_list():
if parent_class._meta.unique_together:
unique_togethers.append((parent_class, parent_class._meta.unique_together))
if parent_class._meta.constraints:
constraints.append((parent_class, parent_class._meta.constraints))
for model_class, unique_together in unique_togethers:
for check in unique_together:
if not any(name in exclude for name in check):
# Add the check if the field isn't excluded.
unique_checks.append((model_class, tuple(check)))
for model_class, model_constraints in constraints:
for constraint in model_constraints:
if (isinstance(constraint, UniqueConstraint) and
# Partial unique constraints can't be validated.
constraint.condition is None and
not any(name in exclude for name in constraint.fields)):
unique_checks.append((model_class, constraint.fields))
# These are checks for the unique_for_<date/year/month>.
date_checks = []
# Gather a list of checks for fields declared as unique and add them to
# the list of checks.
fields_with_class = [(self.__class__, self._meta.local_fields)]
for parent_class in self._meta.get_parent_list():
fields_with_class.append((parent_class, parent_class._meta.local_fields))
for model_class, fields in fields_with_class:
for f in fields:
name = f.name
if name in exclude:
continue
if f.unique:
unique_checks.append((model_class, (name,)))
if f.unique_for_date and f.unique_for_date not in exclude:
date_checks.append((model_class, 'date', name, f.unique_for_date))
if f.unique_for_year and f.unique_for_year not in exclude:
date_checks.append((model_class, 'year', name, f.unique_for_year))
if f.unique_for_month and f.unique_for_month not in exclude:
date_checks.append((model_class, 'month', name, f.unique_for_month))
return unique_checks, date_checks
def _perform_unique_checks(self, unique_checks):
errors = {}
for model_class, unique_check in unique_checks:
# Try to look up an existing object with the same values as this
# object's values for all the unique field.
lookup_kwargs = {}
for field_name in unique_check:
f = self._meta.get_field(field_name)
lookup_value = getattr(self, f.attname)
# TODO: Handle multiple backends with different feature flags.
if (lookup_value is None or
(lookup_value == '' and connection.features.interprets_empty_strings_as_nulls)):
# no value, skip the lookup
continue
if f.primary_key and not self._state.adding:
# no need to check for unique primary key when editing
continue
lookup_kwargs[str(field_name)] = lookup_value
# some fields were skipped, no reason to do the check
if len(unique_check) != len(lookup_kwargs):
continue
qs = model_class._default_manager.filter(**lookup_kwargs)
# Exclude the current object from the query if we are editing an
# instance (as opposed to creating a new one)
# Note that we need to use the pk as defined by model_class, not
# self.pk. These can be different fields because model inheritance
# allows single model to have effectively multiple primary keys.
# Refs #17615.
model_class_pk = self._get_pk_val(model_class._meta)
if not self._state.adding and model_class_pk is not None:
qs = qs.exclude(pk=model_class_pk)
if qs.exists():
if len(unique_check) == 1:
key = unique_check[0]
else:
key = NON_FIELD_ERRORS
errors.setdefault(key, []).append(self.unique_error_message(model_class, unique_check))
return errors
def _perform_date_checks(self, date_checks):
errors = {}
for model_class, lookup_type, field, unique_for in date_checks:
lookup_kwargs = {}
# there's a ticket to add a date lookup, we can remove this special
# case if that makes it's way in
date = getattr(self, unique_for)
if date is None:
continue
if lookup_type == 'date':
lookup_kwargs['%s__day' % unique_for] = date.day
lookup_kwargs['%s__month' % unique_for] = date.month
lookup_kwargs['%s__year' % unique_for] = date.year
else:
lookup_kwargs['%s__%s' % (unique_for, lookup_type)] = getattr(date, lookup_type)
lookup_kwargs[field] = getattr(self, field)
qs = model_class._default_manager.filter(**lookup_kwargs)
# Exclude the current object from the query if we are editing an
# instance (as opposed to creating a new one)
if not self._state.adding and self.pk is not None:
qs = qs.exclude(pk=self.pk)
if qs.exists():
errors.setdefault(field, []).append(
self.date_error_message(lookup_type, field, unique_for)
)
return errors
def date_error_message(self, lookup_type, field_name, unique_for):
opts = self._meta
field = opts.get_field(field_name)
return ValidationError(
message=field.error_messages['unique_for_date'],
code='unique_for_date',
params={
'model': self,
'model_name': capfirst(opts.verbose_name),
'lookup_type': lookup_type,
'field': field_name,
'field_label': capfirst(field.verbose_name),
'date_field': unique_for,
'date_field_label': capfirst(opts.get_field(unique_for).verbose_name),
}
)
def unique_error_message(self, model_class, unique_check):
opts = model_class._meta
params = {
'model': self,
'model_class': model_class,
'model_name': capfirst(opts.verbose_name),
'unique_check': unique_check,
}
# A unique field
if len(unique_check) == 1:
field = opts.get_field(unique_check[0])
params['field_label'] = capfirst(field.verbose_name)
return ValidationError(
message=field.error_messages['unique'],
code='unique',
params=params,
)
# unique_together
else:
field_labels = [capfirst(opts.get_field(f).verbose_name) for f in unique_check]
params['field_labels'] = get_text_list(field_labels, _('and'))
return ValidationError(
message=_("%(model_name)s with this %(field_labels)s already exists."),
code='unique_together',
params=params,
)
def full_clean(self, exclude=None, validate_unique=True):
"""
Call clean_fields(), clean(), and validate_unique() on the model.
Raise a ValidationError for any errors that occur.
"""
errors = {}
if exclude is None:
exclude = []
else:
exclude = list(exclude)
try:
self.clean_fields(exclude=exclude)
except ValidationError as e:
errors = e.update_error_dict(errors)
# Form.clean() is run even if other validation fails, so do the
# same with Model.clean() for consistency.
try:
self.clean()
except ValidationError as e:
errors = e.update_error_dict(errors)
# Run unique checks, but only for fields that passed validation.
if validate_unique:
for name in errors:
if name != NON_FIELD_ERRORS and name not in exclude:
exclude.append(name)
try:
self.validate_unique(exclude=exclude)
except ValidationError as e:
errors = e.update_error_dict(errors)
if errors:
raise ValidationError(errors)
def clean_fields(self, exclude=None):
"""
Clean all fields and raise a ValidationError containing a dict
of all validation errors if any occur.
"""
if exclude is None:
exclude = []
errors = {}
for f in self._meta.fields:
if f.name in exclude:
continue
# Skip validation for empty fields with blank=True. The developer
# is responsible for making sure they have a valid value.
raw_value = getattr(self, f.attname)
if f.blank and raw_value in f.empty_values:
continue
try:
setattr(self, f.attname, f.clean(raw_value, self))
except ValidationError as e:
errors[f.name] = e.error_list
if errors:
raise ValidationError(errors)
@classmethod
def check(cls, **kwargs):
errors = [*cls._check_swappable(), *cls._check_model(), *cls._check_managers(**kwargs)]
if not cls._meta.swapped:
errors += [
*cls._check_fields(**kwargs),
*cls._check_m2m_through_same_relationship(),
*cls._check_long_column_names(),
]
clash_errors = (
*cls._check_id_field(),
*cls._check_field_name_clashes(),
*cls._check_model_name_db_lookup_clashes(),
*cls._check_property_name_related_field_accessor_clashes(),
*cls._check_single_primary_key(),
)
errors.extend(clash_errors)
# If there are field name clashes, hide consequent column name
# clashes.
if not clash_errors:
errors.extend(cls._check_column_name_clashes())
errors += [
*cls._check_index_together(),
*cls._check_unique_together(),
*cls._check_indexes(),
*cls._check_ordering(),
*cls._check_constraints(),
]
return errors
@classmethod
def _check_swappable(cls):
"""Check if the swapped model exists."""
errors = []
if cls._meta.swapped:
try:
apps.get_model(cls._meta.swapped)
except ValueError:
errors.append(
checks.Error(
"'%s' is not of the form 'app_label.app_name'." % cls._meta.swappable,
id='models.E001',
)
)
except LookupError:
app_label, model_name = cls._meta.swapped.split('.')
errors.append(
checks.Error(
"'%s' references '%s.%s', which has not been "
"installed, or is abstract." % (
cls._meta.swappable, app_label, model_name
),
id='models.E002',
)
)
return errors
@classmethod
def _check_model(cls):
errors = []
if cls._meta.proxy:
if cls._meta.local_fields or cls._meta.local_many_to_many:
errors.append(
checks.Error(
"Proxy model '%s' contains model fields." % cls.__name__,
id='models.E017',
)
)
return errors
@classmethod
def _check_managers(cls, **kwargs):
"""Perform all manager checks."""
errors = []
for manager in cls._meta.managers:
errors.extend(manager.check(**kwargs))
return errors
@classmethod
def _check_fields(cls, **kwargs):
"""Perform all field checks."""
errors = []
for field in cls._meta.local_fields:
errors.extend(field.check(**kwargs))
for field in cls._meta.local_many_to_many:
errors.extend(field.check(from_model=cls, **kwargs))
return errors
@classmethod
def _check_m2m_through_same_relationship(cls):
""" Check if no relationship model is used by more than one m2m field.
"""
errors = []
seen_intermediary_signatures = []
fields = cls._meta.local_many_to_many
# Skip when the target model wasn't found.
fields = (f for f in fields if isinstance(f.remote_field.model, ModelBase))
# Skip when the relationship model wasn't found.
fields = (f for f in fields if isinstance(f.remote_field.through, ModelBase))
for f in fields:
signature = (f.remote_field.model, cls, f.remote_field.through, f.remote_field.through_fields)
if signature in seen_intermediary_signatures:
errors.append(
checks.Error(
"The model has two identical many-to-many relations "
"through the intermediate model '%s'." %
f.remote_field.through._meta.label,
obj=cls,
id='models.E003',
)
)
else:
seen_intermediary_signatures.append(signature)
return errors
@classmethod
def _check_id_field(cls):
"""Check if `id` field is a primary key."""
fields = [f for f in cls._meta.local_fields if f.name == 'id' and f != cls._meta.pk]
# fields is empty or consists of the invalid "id" field
if fields and not fields[0].primary_key and cls._meta.pk.name == 'id':
return [
checks.Error(
"'id' can only be used as a field name if the field also "
"sets 'primary_key=True'.",
obj=cls,
id='models.E004',
)
]
else:
return []
@classmethod
def _check_field_name_clashes(cls):
"""Forbid field shadowing in multi-table inheritance."""
errors = []
used_fields = {} # name or attname -> field
# Check that multi-inheritance doesn't cause field name shadowing.
for parent in cls._meta.get_parent_list():
for f in parent._meta.local_fields:
clash = used_fields.get(f.name) or used_fields.get(f.attname) or None
if clash:
errors.append(
checks.Error(
"The field '%s' from parent model "
"'%s' clashes with the field '%s' "
"from parent model '%s'." % (
clash.name, clash.model._meta,
f.name, f.model._meta
),
obj=cls,
id='models.E005',
)
)
used_fields[f.name] = f
used_fields[f.attname] = f
# Check that fields defined in the model don't clash with fields from
# parents, including auto-generated fields like multi-table inheritance
# child accessors.
for parent in cls._meta.get_parent_list():
for f in parent._meta.get_fields():
if f not in used_fields:
used_fields[f.name] = f
for f in cls._meta.local_fields:
clash = used_fields.get(f.name) or used_fields.get(f.attname) or None
# Note that we may detect clash between user-defined non-unique
# field "id" and automatically added unique field "id", both
# defined at the same model. This special case is considered in
# _check_id_field and here we ignore it.
id_conflict = f.name == "id" and clash and clash.name == "id" and clash.model == cls
if clash and not id_conflict:
errors.append(
checks.Error(
"The field '%s' clashes with the field '%s' "
"from model '%s'." % (
f.name, clash.name, clash.model._meta
),
obj=f,
id='models.E006',
)
)
used_fields[f.name] = f
used_fields[f.attname] = f
return errors
@classmethod
def _check_column_name_clashes(cls):
# Store a list of column names which have already been used by other fields.
used_column_names = []
errors = []
for f in cls._meta.local_fields:
_, column_name = f.get_attname_column()
# Ensure the column name is not already in use.
if column_name and column_name in used_column_names:
errors.append(
checks.Error(
"Field '%s' has column name '%s' that is used by "
"another field." % (f.name, column_name),
hint="Specify a 'db_column' for the field.",
obj=cls,
id='models.E007'
)
)
else:
used_column_names.append(column_name)
return errors
@classmethod
def _check_model_name_db_lookup_clashes(cls):
errors = []
model_name = cls.__name__
if model_name.startswith('_') or model_name.endswith('_'):
errors.append(
checks.Error(
"The model name '%s' cannot start or end with an underscore "
"as it collides with the query lookup syntax." % model_name,
obj=cls,
id='models.E023'
)
)
elif LOOKUP_SEP in model_name:
errors.append(
checks.Error(
"The model name '%s' cannot contain double underscores as "
"it collides with the query lookup syntax." % model_name,
obj=cls,
id='models.E024'
)
)
return errors
@classmethod
def _check_property_name_related_field_accessor_clashes(cls):
errors = []
property_names = cls._meta._property_names
related_field_accessors = (
f.get_attname() for f in cls._meta._get_fields(reverse=False)
if f.is_relation and f.related_model is not None
)
for accessor in related_field_accessors:
if accessor in property_names:
errors.append(
checks.Error(
"The property '%s' clashes with a related field "
"accessor." % accessor,
obj=cls,
id='models.E025',
)
)
return errors
@classmethod
def _check_single_primary_key(cls):
errors = []
if sum(1 for f in cls._meta.local_fields if f.primary_key) > 1:
errors.append(
checks.Error(
"The model cannot have more than one field with "
"'primary_key=True'.",
obj=cls,
id='models.E026',
)
)
return errors
@classmethod
def _check_index_together(cls):
"""Check the value of "index_together" option."""
if not isinstance(cls._meta.index_together, (tuple, list)):
return [
checks.Error(
"'index_together' must be a list or tuple.",
obj=cls,
id='models.E008',
)
]
elif any(not isinstance(fields, (tuple, list)) for fields in cls._meta.index_together):
return [
checks.Error(
"All 'index_together' elements must be lists or tuples.",
obj=cls,
id='models.E009',
)
]
else:
errors = []
for fields in cls._meta.index_together:
errors.extend(cls._check_local_fields(fields, "index_together"))
return errors
@classmethod
def _check_unique_together(cls):
"""Check the value of "unique_together" option."""
if not isinstance(cls._meta.unique_together, (tuple, list)):
return [
checks.Error(
"'unique_together' must be a list or tuple.",
obj=cls,
id='models.E010',
)
]
elif any(not isinstance(fields, (tuple, list)) for fields in cls._meta.unique_together):
return [
checks.Error(
"All 'unique_together' elements must be lists or tuples.",
obj=cls,
id='models.E011',
)
]
else:
errors = []
for fields in cls._meta.unique_together:
errors.extend(cls._check_local_fields(fields, "unique_together"))
return errors
@classmethod
def _check_indexes(cls):
"""Check the fields and names of indexes."""
errors = []
for index in cls._meta.indexes:
# Index name can't start with an underscore or a number, restricted
# for cross-database compatibility with Oracle.
if index.name[0] == '_' or index.name[0].isdigit():
errors.append(
checks.Error(
"The index name '%s' cannot start with an underscore "
"or a number." % index.name,
obj=cls,
id='models.E033',
),
)
if len(index.name) > index.max_name_length:
errors.append(
checks.Error(
"The index name '%s' cannot be longer than %d "
"characters." % (index.name, index.max_name_length),
obj=cls,
id='models.E034',
),
)
fields = [field for index in cls._meta.indexes for field, _ in index.fields_orders]
errors.extend(cls._check_local_fields(fields, 'indexes'))
return errors
@classmethod
def _check_local_fields(cls, fields, option):
from django.db import models
# In order to avoid hitting the relation tree prematurely, we use our
# own fields_map instead of using get_field()
forward_fields_map = {}
for field in cls._meta._get_fields(reverse=False):
forward_fields_map[field.name] = field
if hasattr(field, 'attname'):
forward_fields_map[field.attname] = field
errors = []
for field_name in fields:
try:
field = forward_fields_map[field_name]
except KeyError:
errors.append(
checks.Error(
"'%s' refers to the nonexistent field '%s'." % (
option, field_name,
),
obj=cls,
id='models.E012',
)
)
else:
if isinstance(field.remote_field, models.ManyToManyRel):
errors.append(
checks.Error(
"'%s' refers to a ManyToManyField '%s', but "
"ManyToManyFields are not permitted in '%s'." % (
option, field_name, option,
),
obj=cls,
id='models.E013',
)
)
elif field not in cls._meta.local_fields:
errors.append(
checks.Error(
"'%s' refers to field '%s' which is not local to model '%s'."
% (option, field_name, cls._meta.object_name),
hint="This issue may be caused by multi-table inheritance.",
obj=cls,
id='models.E016',
)
)
return errors
@classmethod
def _check_ordering(cls):
"""
Check "ordering" option -- is it a list of strings and do all fields
exist?
"""
if cls._meta._ordering_clash:
return [
checks.Error(
"'ordering' and 'order_with_respect_to' cannot be used together.",
obj=cls,
id='models.E021',
),
]
if cls._meta.order_with_respect_to or not cls._meta.ordering:
return []
if not isinstance(cls._meta.ordering, (list, tuple)):
return [
checks.Error(
"'ordering' must be a tuple or list (even if you want to order by only one field).",
obj=cls,
id='models.E014',
)
]
errors = []
fields = cls._meta.ordering
# Skip expressions and '?' fields.
fields = (f for f in fields if isinstance(f, str) and f != '?')
# Convert "-field" to "field".
fields = ((f[1:] if f.startswith('-') else f) for f in fields)
# Separate related fields and non-related fields.
_fields = []
related_fields = []
for f in fields:
if LOOKUP_SEP in f:
related_fields.append(f)
else:
_fields.append(f)
fields = _fields
# Check related fields.
for field in related_fields:
_cls = cls
fld = None
for part in field.split(LOOKUP_SEP):
try:
# pk is an alias that won't be found by opts.get_field.
if part == 'pk':
fld = _cls._meta.pk
else:
fld = _cls._meta.get_field(part)
if fld.is_relation:
_cls = fld.get_path_info()[-1].to_opts.model
else:
_cls = None
except (FieldDoesNotExist, AttributeError):
if fld is None or fld.get_transform(part) is None:
errors.append(
checks.Error(
"'ordering' refers to the nonexistent field, "
"related field, or lookup '%s'." % field,
obj=cls,
id='models.E015',
)
)
# Skip ordering on pk. This is always a valid order_by field
# but is an alias and therefore won't be found by opts.get_field.
fields = {f for f in fields if f != 'pk'}
# Check for invalid or nonexistent fields in ordering.
invalid_fields = []
# Any field name that is not present in field_names does not exist.
# Also, ordering by m2m fields is not allowed.
opts = cls._meta
valid_fields = set(chain.from_iterable(
(f.name, f.attname) if not (f.auto_created and not f.concrete) else (f.field.related_query_name(),)
for f in chain(opts.fields, opts.related_objects)
))
invalid_fields.extend(fields - valid_fields)
for invalid_field in invalid_fields:
errors.append(
checks.Error(
"'ordering' refers to the nonexistent field, related "
"field, or lookup '%s'." % invalid_field,
obj=cls,
id='models.E015',
)
)
return errors
@classmethod
def _check_long_column_names(cls):
"""
Check that any auto-generated column names are shorter than the limits
for each database in which the model will be created.
"""
errors = []
allowed_len = None
db_alias = None
# Find the minimum max allowed length among all specified db_aliases.
for db in settings.DATABASES:
# skip databases where the model won't be created
if not router.allow_migrate_model(db, cls):
continue
connection = connections[db]
max_name_length = connection.ops.max_name_length()
if max_name_length is None or connection.features.truncates_names:
continue
else:
if allowed_len is None:
allowed_len = max_name_length
db_alias = db
elif max_name_length < allowed_len:
allowed_len = max_name_length
db_alias = db
if allowed_len is None:
return errors
for f in cls._meta.local_fields:
_, column_name = f.get_attname_column()
# Check if auto-generated name for the field is too long
# for the database.
if f.db_column is None and column_name is not None and len(column_name) > allowed_len:
errors.append(
checks.Error(
'Autogenerated column name too long for field "%s". '
'Maximum length is "%s" for database "%s".'
% (column_name, allowed_len, db_alias),
hint="Set the column name manually using 'db_column'.",
obj=cls,
id='models.E018',
)
)
for f in cls._meta.local_many_to_many:
# Skip nonexistent models.
if isinstance(f.remote_field.through, str):
continue
# Check if auto-generated name for the M2M field is too long
# for the database.
for m2m in f.remote_field.through._meta.local_fields:
_, rel_name = m2m.get_attname_column()
if m2m.db_column is None and rel_name is not None and len(rel_name) > allowed_len:
errors.append(
checks.Error(
'Autogenerated column name too long for M2M field '
'"%s". Maximum length is "%s" for database "%s".'
% (rel_name, allowed_len, db_alias),
hint=(
"Use 'through' to create a separate model for "
"M2M and then set column_name using 'db_column'."
),
obj=cls,
id='models.E019',
)
)
return errors
@classmethod
def _check_constraints(cls):
errors = []
for db in settings.DATABASES:
if not router.allow_migrate_model(db, cls):
continue
connection = connections[db]
if (
connection.features.supports_table_check_constraints or
'supports_table_check_constraints' in cls._meta.required_db_features
):
continue
if any(isinstance(constraint, CheckConstraint) for constraint in cls._meta.constraints):
errors.append(
checks.Warning(
'%s does not support check constraints.' % connection.display_name,
hint=(
"A constraint won't be created. Silence this "
"warning if you don't care about it."
),
obj=cls,
id='models.W027',
)
)
return errors
############################################
# HELPER FUNCTIONS (CURRIED MODEL METHODS) #
############################################
# ORDERING METHODS #########################
def method_set_order(self, ordered_obj, id_list, using=None):
if using is None:
using = DEFAULT_DB_ALIAS
order_wrt = ordered_obj._meta.order_with_respect_to
filter_args = order_wrt.get_forward_related_filter(self)
ordered_obj.objects.db_manager(using).filter(**filter_args).bulk_update([
ordered_obj(pk=pk, _order=order) for order, pk in enumerate(id_list)
], ['_order'])
def method_get_order(self, ordered_obj):
order_wrt = ordered_obj._meta.order_with_respect_to
filter_args = order_wrt.get_forward_related_filter(self)
pk_name = ordered_obj._meta.pk.name
return ordered_obj.objects.filter(**filter_args).values_list(pk_name, flat=True)
def make_foreign_order_accessors(model, related_model):
setattr(
related_model,
'get_%s_order' % model.__name__.lower(),
partialmethod(method_get_order, model)
)
setattr(
related_model,
'set_%s_order' % model.__name__.lower(),
partialmethod(method_set_order, model)
)
########
# MISC #
########
def model_unpickle(model_id):
"""Used to unpickle Model subclasses with deferred fields."""
if isinstance(model_id, tuple):
model = apps.get_model(*model_id)
else:
# Backwards compat - the model was cached directly in earlier versions.
model = model_id
return model.__new__(model)
model_unpickle.__safe_for_unpickle__ = True
|
ba6d73c9db82894254d367316706c6ef71902565ee3c3f91dda374eb06111e38 | import collections.abc
import copy
import datetime
import decimal
import operator
import uuid
import warnings
from base64 import b64decode, b64encode
from functools import partialmethod, total_ordering
from django import forms
from django.apps import apps
from django.conf import settings
from django.core import checks, exceptions, validators
from django.db import connection, connections, router
from django.db.models.constants import LOOKUP_SEP
from django.db.models.query_utils import DeferredAttribute, RegisterLookupMixin
from django.utils import timezone
from django.utils.datastructures import DictWrapper
from django.utils.dateparse import (
parse_date, parse_datetime, parse_duration, parse_time,
)
from django.utils.duration import duration_microseconds, duration_string
from django.utils.functional import Promise, cached_property
from django.utils.ipv6 import clean_ipv6_address
from django.utils.itercompat import is_iterable
from django.utils.text import capfirst
from django.utils.translation import gettext_lazy as _
__all__ = [
'AutoField', 'BLANK_CHOICE_DASH', 'BigAutoField', 'BigIntegerField',
'BinaryField', 'BooleanField', 'CharField', 'CommaSeparatedIntegerField',
'DateField', 'DateTimeField', 'DecimalField', 'DurationField',
'EmailField', 'Empty', 'Field', 'FilePathField', 'FloatField',
'GenericIPAddressField', 'IPAddressField', 'IntegerField', 'NOT_PROVIDED',
'NullBooleanField', 'PositiveBigIntegerField', 'PositiveIntegerField',
'PositiveSmallIntegerField', 'SlugField', 'SmallAutoField',
'SmallIntegerField', 'TextField', 'TimeField', 'URLField', 'UUIDField',
]
class Empty:
pass
class NOT_PROVIDED:
pass
# The values to use for "blank" in SelectFields. Will be appended to the start
# of most "choices" lists.
BLANK_CHOICE_DASH = [("", "---------")]
def _load_field(app_label, model_name, field_name):
return apps.get_model(app_label, model_name)._meta.get_field(field_name)
# A guide to Field parameters:
#
# * name: The name of the field specified in the model.
# * attname: The attribute to use on the model object. This is the same as
# "name", except in the case of ForeignKeys, where "_id" is
# appended.
# * db_column: The db_column specified in the model (or None).
# * column: The database column for this field. This is the same as
# "attname", except if db_column is specified.
#
# Code that introspects values, or does other dynamic things, should use
# attname. For example, this gets the primary key value of object "obj":
#
# getattr(obj, opts.pk.attname)
def _empty(of_cls):
new = Empty()
new.__class__ = of_cls
return new
def return_None():
return None
@total_ordering
class Field(RegisterLookupMixin):
"""Base class for all field types"""
# Designates whether empty strings fundamentally are allowed at the
# database level.
empty_strings_allowed = True
empty_values = list(validators.EMPTY_VALUES)
# These track each time a Field instance is created. Used to retain order.
# The auto_creation_counter is used for fields that Django implicitly
# creates, creation_counter is used for all user-specified fields.
creation_counter = 0
auto_creation_counter = -1
default_validators = [] # Default set of validators
default_error_messages = {
'invalid_choice': _('Value %(value)r is not a valid choice.'),
'null': _('This field cannot be null.'),
'blank': _('This field cannot be blank.'),
'unique': _('%(model_name)s with this %(field_label)s '
'already exists.'),
# Translators: The 'lookup_type' is one of 'date', 'year' or 'month'.
# Eg: "Title must be unique for pub_date year"
'unique_for_date': _("%(field_label)s must be unique for "
"%(date_field_label)s %(lookup_type)s."),
}
system_check_deprecated_details = None
system_check_removed_details = None
# Field flags
hidden = False
many_to_many = None
many_to_one = None
one_to_many = None
one_to_one = None
related_model = None
descriptor_class = DeferredAttribute
# Generic field type description, usually overridden by subclasses
def _description(self):
return _('Field of type: %(field_type)s') % {
'field_type': self.__class__.__name__
}
description = property(_description)
def __init__(self, verbose_name=None, name=None, primary_key=False,
max_length=None, unique=False, blank=False, null=False,
db_index=False, rel=None, default=NOT_PROVIDED, editable=True,
serialize=True, unique_for_date=None, unique_for_month=None,
unique_for_year=None, choices=None, help_text='', db_column=None,
db_tablespace=None, auto_created=False, validators=(),
error_messages=None):
self.name = name
self.verbose_name = verbose_name # May be set by set_attributes_from_name
self._verbose_name = verbose_name # Store original for deconstruction
self.primary_key = primary_key
self.max_length, self._unique = max_length, unique
self.blank, self.null = blank, null
self.remote_field = rel
self.is_relation = self.remote_field is not None
self.default = default
self.editable = editable
self.serialize = serialize
self.unique_for_date = unique_for_date
self.unique_for_month = unique_for_month
self.unique_for_year = unique_for_year
if isinstance(choices, collections.abc.Iterator):
choices = list(choices)
self.choices = choices
self.help_text = help_text
self.db_index = db_index
self.db_column = db_column
self._db_tablespace = db_tablespace
self.auto_created = auto_created
# Adjust the appropriate creation counter, and save our local copy.
if auto_created:
self.creation_counter = Field.auto_creation_counter
Field.auto_creation_counter -= 1
else:
self.creation_counter = Field.creation_counter
Field.creation_counter += 1
self._validators = list(validators) # Store for deconstruction later
messages = {}
for c in reversed(self.__class__.__mro__):
messages.update(getattr(c, 'default_error_messages', {}))
messages.update(error_messages or {})
self._error_messages = error_messages # Store for deconstruction later
self.error_messages = messages
def __str__(self):
"""
Return "app_label.model_label.field_name" for fields attached to
models.
"""
if not hasattr(self, 'model'):
return super().__str__()
model = self.model
app = model._meta.app_label
return '%s.%s.%s' % (app, model._meta.object_name, self.name)
def __repr__(self):
"""Display the module, class, and name of the field."""
path = '%s.%s' % (self.__class__.__module__, self.__class__.__qualname__)
name = getattr(self, 'name', None)
if name is not None:
return '<%s: %s>' % (path, name)
return '<%s>' % path
def check(self, **kwargs):
return [
*self._check_field_name(),
*self._check_choices(),
*self._check_db_index(),
*self._check_null_allowed_for_primary_keys(),
*self._check_backend_specific_checks(**kwargs),
*self._check_validators(),
*self._check_deprecation_details(),
]
def _check_field_name(self):
"""
Check if field name is valid, i.e. 1) does not end with an
underscore, 2) does not contain "__" and 3) is not "pk".
"""
if self.name.endswith('_'):
return [
checks.Error(
'Field names must not end with an underscore.',
obj=self,
id='fields.E001',
)
]
elif LOOKUP_SEP in self.name:
return [
checks.Error(
'Field names must not contain "%s".' % (LOOKUP_SEP,),
obj=self,
id='fields.E002',
)
]
elif self.name == 'pk':
return [
checks.Error(
"'pk' is a reserved word that cannot be used as a field name.",
obj=self,
id='fields.E003',
)
]
else:
return []
@classmethod
def _choices_is_value(cls, value):
return isinstance(value, (str, Promise)) or not is_iterable(value)
def _check_choices(self):
if not self.choices:
return []
if not is_iterable(self.choices) or isinstance(self.choices, str):
return [
checks.Error(
"'choices' must be an iterable (e.g., a list or tuple).",
obj=self,
id='fields.E004',
)
]
choice_max_length = 0
# Expect [group_name, [value, display]]
for choices_group in self.choices:
try:
group_name, group_choices = choices_group
except (TypeError, ValueError):
# Containing non-pairs
break
try:
if not all(
self._choices_is_value(value) and self._choices_is_value(human_name)
for value, human_name in group_choices
):
break
if self.max_length is not None and group_choices:
choice_max_length = max([
choice_max_length,
*(len(value) for value, _ in group_choices if isinstance(value, str)),
])
except (TypeError, ValueError):
# No groups, choices in the form [value, display]
value, human_name = group_name, group_choices
if not self._choices_is_value(value) or not self._choices_is_value(human_name):
break
if self.max_length is not None and isinstance(value, str):
choice_max_length = max(choice_max_length, len(value))
# Special case: choices=['ab']
if isinstance(choices_group, str):
break
else:
if self.max_length is not None and choice_max_length > self.max_length:
return [
checks.Error(
"'max_length' is too small to fit the longest value "
"in 'choices' (%d characters)." % choice_max_length,
obj=self,
id='fields.E009',
),
]
return []
return [
checks.Error(
"'choices' must be an iterable containing "
"(actual value, human readable name) tuples.",
obj=self,
id='fields.E005',
)
]
def _check_db_index(self):
if self.db_index not in (None, True, False):
return [
checks.Error(
"'db_index' must be None, True or False.",
obj=self,
id='fields.E006',
)
]
else:
return []
def _check_null_allowed_for_primary_keys(self):
if (self.primary_key and self.null and
not connection.features.interprets_empty_strings_as_nulls):
# We cannot reliably check this for backends like Oracle which
# consider NULL and '' to be equal (and thus set up
# character-based fields a little differently).
return [
checks.Error(
'Primary keys must not have null=True.',
hint=('Set null=False on the field, or '
'remove primary_key=True argument.'),
obj=self,
id='fields.E007',
)
]
else:
return []
def _check_backend_specific_checks(self, **kwargs):
app_label = self.model._meta.app_label
for db in connections:
if router.allow_migrate(db, app_label, model_name=self.model._meta.model_name):
return connections[db].validation.check_field(self, **kwargs)
return []
def _check_validators(self):
errors = []
for i, validator in enumerate(self.validators):
if not callable(validator):
errors.append(
checks.Error(
"All 'validators' must be callable.",
hint=(
"validators[{i}] ({repr}) isn't a function or "
"instance of a validator class.".format(
i=i, repr=repr(validator),
)
),
obj=self,
id='fields.E008',
)
)
return errors
def _check_deprecation_details(self):
if self.system_check_removed_details is not None:
return [
checks.Error(
self.system_check_removed_details.get(
'msg',
'%s has been removed except for support in historical '
'migrations.' % self.__class__.__name__
),
hint=self.system_check_removed_details.get('hint'),
obj=self,
id=self.system_check_removed_details.get('id', 'fields.EXXX'),
)
]
elif self.system_check_deprecated_details is not None:
return [
checks.Warning(
self.system_check_deprecated_details.get(
'msg',
'%s has been deprecated.' % self.__class__.__name__
),
hint=self.system_check_deprecated_details.get('hint'),
obj=self,
id=self.system_check_deprecated_details.get('id', 'fields.WXXX'),
)
]
return []
def get_col(self, alias, output_field=None):
if output_field is None:
output_field = self
if alias != self.model._meta.db_table or output_field != self:
from django.db.models.expressions import Col
return Col(alias, self, output_field)
else:
return self.cached_col
@cached_property
def cached_col(self):
from django.db.models.expressions import Col
return Col(self.model._meta.db_table, self)
def select_format(self, compiler, sql, params):
"""
Custom format for select clauses. For example, GIS columns need to be
selected as AsText(table.col) on MySQL as the table.col data can't be
used by Django.
"""
return sql, params
def deconstruct(self):
"""
Return enough information to recreate the field as a 4-tuple:
* The name of the field on the model, if contribute_to_class() has
been run.
* The import path of the field, including the class:e.g.
django.db.models.IntegerField This should be the most portable
version, so less specific may be better.
* A list of positional arguments.
* A dict of keyword arguments.
Note that the positional or keyword arguments must contain values of
the following types (including inner values of collection types):
* None, bool, str, int, float, complex, set, frozenset, list, tuple,
dict
* UUID
* datetime.datetime (naive), datetime.date
* top-level classes, top-level functions - will be referenced by their
full import path
* Storage instances - these have their own deconstruct() method
This is because the values here must be serialized into a text format
(possibly new Python code, possibly JSON) and these are the only types
with encoding handlers defined.
There's no need to return the exact way the field was instantiated this
time, just ensure that the resulting field is the same - prefer keyword
arguments over positional ones, and omit parameters with their default
values.
"""
# Short-form way of fetching all the default parameters
keywords = {}
possibles = {
"verbose_name": None,
"primary_key": False,
"max_length": None,
"unique": False,
"blank": False,
"null": False,
"db_index": False,
"default": NOT_PROVIDED,
"editable": True,
"serialize": True,
"unique_for_date": None,
"unique_for_month": None,
"unique_for_year": None,
"choices": None,
"help_text": '',
"db_column": None,
"db_tablespace": None,
"auto_created": False,
"validators": [],
"error_messages": None,
}
attr_overrides = {
"unique": "_unique",
"error_messages": "_error_messages",
"validators": "_validators",
"verbose_name": "_verbose_name",
"db_tablespace": "_db_tablespace",
}
equals_comparison = {"choices", "validators"}
for name, default in possibles.items():
value = getattr(self, attr_overrides.get(name, name))
# Unroll anything iterable for choices into a concrete list
if name == "choices" and isinstance(value, collections.abc.Iterable):
value = list(value)
# Do correct kind of comparison
if name in equals_comparison:
if value != default:
keywords[name] = value
else:
if value is not default:
keywords[name] = value
# Work out path - we shorten it for known Django core fields
path = "%s.%s" % (self.__class__.__module__, self.__class__.__qualname__)
if path.startswith("django.db.models.fields.related"):
path = path.replace("django.db.models.fields.related", "django.db.models")
elif path.startswith("django.db.models.fields.files"):
path = path.replace("django.db.models.fields.files", "django.db.models")
elif path.startswith("django.db.models.fields.proxy"):
path = path.replace("django.db.models.fields.proxy", "django.db.models")
elif path.startswith("django.db.models.fields"):
path = path.replace("django.db.models.fields", "django.db.models")
# Return basic info - other fields should override this.
return (self.name, path, [], keywords)
def clone(self):
"""
Uses deconstruct() to clone a new copy of this Field.
Will not preserve any class attachments/attribute names.
"""
name, path, args, kwargs = self.deconstruct()
return self.__class__(*args, **kwargs)
def __eq__(self, other):
# Needed for @total_ordering
if isinstance(other, Field):
return self.creation_counter == other.creation_counter
return NotImplemented
def __lt__(self, other):
# This is needed because bisect does not take a comparison function.
if isinstance(other, Field):
return self.creation_counter < other.creation_counter
return NotImplemented
def __hash__(self):
return hash(self.creation_counter)
def __deepcopy__(self, memodict):
# We don't have to deepcopy very much here, since most things are not
# intended to be altered after initial creation.
obj = copy.copy(self)
if self.remote_field:
obj.remote_field = copy.copy(self.remote_field)
if hasattr(self.remote_field, 'field') and self.remote_field.field is self:
obj.remote_field.field = obj
memodict[id(self)] = obj
return obj
def __copy__(self):
# We need to avoid hitting __reduce__, so define this
# slightly weird copy construct.
obj = Empty()
obj.__class__ = self.__class__
obj.__dict__ = self.__dict__.copy()
return obj
def __reduce__(self):
"""
Pickling should return the model._meta.fields instance of the field,
not a new copy of that field. So, use the app registry to load the
model and then the field back.
"""
if not hasattr(self, 'model'):
# Fields are sometimes used without attaching them to models (for
# example in aggregation). In this case give back a plain field
# instance. The code below will create a new empty instance of
# class self.__class__, then update its dict with self.__dict__
# values - so, this is very close to normal pickle.
state = self.__dict__.copy()
# The _get_default cached_property can't be pickled due to lambda
# usage.
state.pop('_get_default', None)
return _empty, (self.__class__,), state
return _load_field, (self.model._meta.app_label, self.model._meta.object_name,
self.name)
def get_pk_value_on_save(self, instance):
"""
Hook to generate new PK values on save. This method is called when
saving instances with no primary key value set. If this method returns
something else than None, then the returned value is used when saving
the new instance.
"""
if self.default:
return self.get_default()
return None
def to_python(self, value):
"""
Convert the input value into the expected Python data type, raising
django.core.exceptions.ValidationError if the data can't be converted.
Return the converted value. Subclasses should override this.
"""
return value
@cached_property
def validators(self):
"""
Some validators can't be created at field initialization time.
This method provides a way to delay their creation until required.
"""
return [*self.default_validators, *self._validators]
def run_validators(self, value):
if value in self.empty_values:
return
errors = []
for v in self.validators:
try:
v(value)
except exceptions.ValidationError as e:
if hasattr(e, 'code') and e.code in self.error_messages:
e.message = self.error_messages[e.code]
errors.extend(e.error_list)
if errors:
raise exceptions.ValidationError(errors)
def validate(self, value, model_instance):
"""
Validate value and raise ValidationError if necessary. Subclasses
should override this to provide validation logic.
"""
if not self.editable:
# Skip validation for non-editable fields.
return
if self.choices is not None and value not in self.empty_values:
for option_key, option_value in self.choices:
if isinstance(option_value, (list, tuple)):
# This is an optgroup, so look inside the group for
# options.
for optgroup_key, optgroup_value in option_value:
if value == optgroup_key:
return
elif value == option_key:
return
raise exceptions.ValidationError(
self.error_messages['invalid_choice'],
code='invalid_choice',
params={'value': value},
)
if value is None and not self.null:
raise exceptions.ValidationError(self.error_messages['null'], code='null')
if not self.blank and value in self.empty_values:
raise exceptions.ValidationError(self.error_messages['blank'], code='blank')
def clean(self, value, model_instance):
"""
Convert the value's type and run validation. Validation errors
from to_python() and validate() are propagated. Return the correct
value if no error is raised.
"""
value = self.to_python(value)
self.validate(value, model_instance)
self.run_validators(value)
return value
def db_type_parameters(self, connection):
return DictWrapper(self.__dict__, connection.ops.quote_name, 'qn_')
def db_check(self, connection):
"""
Return the database column check constraint for this field, for the
provided connection. Works the same way as db_type() for the case that
get_internal_type() does not map to a preexisting model field.
"""
data = self.db_type_parameters(connection)
try:
return connection.data_type_check_constraints[self.get_internal_type()] % data
except KeyError:
return None
def db_type(self, connection):
"""
Return the database column data type for this field, for the provided
connection.
"""
# The default implementation of this method looks at the
# backend-specific data_types dictionary, looking up the field by its
# "internal type".
#
# A Field class can implement the get_internal_type() method to specify
# which *preexisting* Django Field class it's most similar to -- i.e.,
# a custom field might be represented by a TEXT column type, which is
# the same as the TextField Django field type, which means the custom
# field's get_internal_type() returns 'TextField'.
#
# But the limitation of the get_internal_type() / data_types approach
# is that it cannot handle database column types that aren't already
# mapped to one of the built-in Django field types. In this case, you
# can implement db_type() instead of get_internal_type() to specify
# exactly which wacky database column type you want to use.
data = self.db_type_parameters(connection)
try:
return connection.data_types[self.get_internal_type()] % data
except KeyError:
return None
def rel_db_type(self, connection):
"""
Return the data type that a related field pointing to this field should
use. For example, this method is called by ForeignKey and OneToOneField
to determine its data type.
"""
return self.db_type(connection)
def cast_db_type(self, connection):
"""Return the data type to use in the Cast() function."""
db_type = connection.ops.cast_data_types.get(self.get_internal_type())
if db_type:
return db_type % self.db_type_parameters(connection)
return self.db_type(connection)
def db_parameters(self, connection):
"""
Extension of db_type(), providing a range of different return values
(type, checks). This will look at db_type(), allowing custom model
fields to override it.
"""
type_string = self.db_type(connection)
check_string = self.db_check(connection)
return {
"type": type_string,
"check": check_string,
}
def db_type_suffix(self, connection):
return connection.data_types_suffix.get(self.get_internal_type())
def get_db_converters(self, connection):
if hasattr(self, 'from_db_value'):
return [self.from_db_value]
return []
@property
def unique(self):
return self._unique or self.primary_key
@property
def db_tablespace(self):
return self._db_tablespace or settings.DEFAULT_INDEX_TABLESPACE
@property
def db_returning(self):
"""
Private API intended only to be used by Django itself. Currently only
the PostgreSQL backend supports returning multiple fields on a model.
"""
return False
def set_attributes_from_name(self, name):
self.name = self.name or name
self.attname, self.column = self.get_attname_column()
self.concrete = self.column is not None
if self.verbose_name is None and self.name:
self.verbose_name = self.name.replace('_', ' ')
def contribute_to_class(self, cls, name, private_only=False):
"""
Register the field with the model class it belongs to.
If private_only is True, create a separate instance of this field
for every subclass of cls, even if cls is not an abstract model.
"""
self.set_attributes_from_name(name)
self.model = cls
cls._meta.add_field(self, private=private_only)
if self.column:
# Don't override classmethods with the descriptor. This means that
# if you have a classmethod and a field with the same name, then
# such fields can't be deferred (we don't have a check for this).
if not getattr(cls, self.attname, None):
setattr(cls, self.attname, self.descriptor_class(self))
if self.choices is not None:
# Don't override a get_FOO_display() method defined explicitly on
# this class, but don't check methods derived from inheritance, to
# allow overriding inherited choices. For more complex inheritance
# structures users should override contribute_to_class().
if 'get_%s_display' % self.name not in cls.__dict__:
setattr(
cls,
'get_%s_display' % self.name,
partialmethod(cls._get_FIELD_display, field=self),
)
def get_filter_kwargs_for_object(self, obj):
"""
Return a dict that when passed as kwargs to self.model.filter(), would
yield all instances having the same value for this field as obj has.
"""
return {self.name: getattr(obj, self.attname)}
def get_attname(self):
return self.name
def get_attname_column(self):
attname = self.get_attname()
column = self.db_column or attname
return attname, column
def get_internal_type(self):
return self.__class__.__name__
def pre_save(self, model_instance, add):
"""Return field's value just before saving."""
return getattr(model_instance, self.attname)
def get_prep_value(self, value):
"""Perform preliminary non-db specific value checks and conversions."""
if isinstance(value, Promise):
value = value._proxy____cast()
return value
def get_db_prep_value(self, value, connection, prepared=False):
"""
Return field's value prepared for interacting with the database backend.
Used by the default implementations of get_db_prep_save().
"""
if not prepared:
value = self.get_prep_value(value)
return value
def get_db_prep_save(self, value, connection):
"""Return field's value prepared for saving into a database."""
return self.get_db_prep_value(value, connection=connection, prepared=False)
def has_default(self):
"""Return a boolean of whether this field has a default value."""
return self.default is not NOT_PROVIDED
def get_default(self):
"""Return the default value for this field."""
return self._get_default()
@cached_property
def _get_default(self):
if self.has_default():
if callable(self.default):
return self.default
return lambda: self.default
if not self.empty_strings_allowed or self.null and not connection.features.interprets_empty_strings_as_nulls:
return return_None
return str # return empty string
def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH, limit_choices_to=None, ordering=()):
"""
Return choices with a default blank choices included, for use
as <select> choices for this field.
"""
if self.choices is not None:
choices = list(self.choices)
if include_blank:
blank_defined = any(choice in ('', None) for choice, _ in self.flatchoices)
if not blank_defined:
choices = blank_choice + choices
return choices
rel_model = self.remote_field.model
limit_choices_to = limit_choices_to or self.get_limit_choices_to()
choice_func = operator.attrgetter(
self.remote_field.get_related_field().attname
if hasattr(self.remote_field, 'get_related_field')
else 'pk'
)
qs = rel_model._default_manager.complex_filter(limit_choices_to)
if ordering:
qs = qs.order_by(*ordering)
return (blank_choice if include_blank else []) + [
(choice_func(x), str(x)) for x in qs
]
def value_to_string(self, obj):
"""
Return a string value of this field from the passed obj.
This is used by the serialization framework.
"""
return str(self.value_from_object(obj))
def _get_flatchoices(self):
"""Flattened version of choices tuple."""
if self.choices is None:
return []
flat = []
for choice, value in self.choices:
if isinstance(value, (list, tuple)):
flat.extend(value)
else:
flat.append((choice, value))
return flat
flatchoices = property(_get_flatchoices)
def save_form_data(self, instance, data):
setattr(instance, self.name, data)
def formfield(self, form_class=None, choices_form_class=None, **kwargs):
"""Return a django.forms.Field instance for this field."""
defaults = {
'required': not self.blank,
'label': capfirst(self.verbose_name),
'help_text': self.help_text,
}
if self.has_default():
if callable(self.default):
defaults['initial'] = self.default
defaults['show_hidden_initial'] = True
else:
defaults['initial'] = self.get_default()
if self.choices is not None:
# Fields with choices get special treatment.
include_blank = (self.blank or
not (self.has_default() or 'initial' in kwargs))
defaults['choices'] = self.get_choices(include_blank=include_blank)
defaults['coerce'] = self.to_python
if self.null:
defaults['empty_value'] = None
if choices_form_class is not None:
form_class = choices_form_class
else:
form_class = forms.TypedChoiceField
# Many of the subclass-specific formfield arguments (min_value,
# max_value) don't apply for choice fields, so be sure to only pass
# the values that TypedChoiceField will understand.
for k in list(kwargs):
if k not in ('coerce', 'empty_value', 'choices', 'required',
'widget', 'label', 'initial', 'help_text',
'error_messages', 'show_hidden_initial', 'disabled'):
del kwargs[k]
defaults.update(kwargs)
if form_class is None:
form_class = forms.CharField
return form_class(**defaults)
def value_from_object(self, obj):
"""Return the value of this field in the given model instance."""
return getattr(obj, self.attname)
class BooleanField(Field):
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value must be either True or False.'),
'invalid_nullable': _('“%(value)s” value must be either True, False, or None.'),
}
description = _("Boolean (Either True or False)")
def get_internal_type(self):
return "BooleanField"
def to_python(self, value):
if self.null and value in self.empty_values:
return None
if value in (True, False):
# 1/0 are equal to True/False. bool() converts former to latter.
return bool(value)
if value in ('t', 'True', '1'):
return True
if value in ('f', 'False', '0'):
return False
raise exceptions.ValidationError(
self.error_messages['invalid_nullable' if self.null else 'invalid'],
code='invalid',
params={'value': value},
)
def get_prep_value(self, value):
value = super().get_prep_value(value)
if value is None:
return None
return self.to_python(value)
def formfield(self, **kwargs):
if self.choices is not None:
include_blank = not (self.has_default() or 'initial' in kwargs)
defaults = {'choices': self.get_choices(include_blank=include_blank)}
else:
form_class = forms.NullBooleanField if self.null else forms.BooleanField
# In HTML checkboxes, 'required' means "must be checked" which is
# different from the choices case ("must select some value").
# required=False allows unchecked checkboxes.
defaults = {'form_class': form_class, 'required': False}
return super().formfield(**{**defaults, **kwargs})
class CharField(Field):
description = _("String (up to %(max_length)s)")
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.validators.append(validators.MaxLengthValidator(self.max_length))
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_max_length_attribute(**kwargs),
]
def _check_max_length_attribute(self, **kwargs):
if self.max_length is None:
return [
checks.Error(
"CharFields must define a 'max_length' attribute.",
obj=self,
id='fields.E120',
)
]
elif (not isinstance(self.max_length, int) or isinstance(self.max_length, bool) or
self.max_length <= 0):
return [
checks.Error(
"'max_length' must be a positive integer.",
obj=self,
id='fields.E121',
)
]
else:
return []
def cast_db_type(self, connection):
if self.max_length is None:
return connection.ops.cast_char_field_without_max_length
return super().cast_db_type(connection)
def get_internal_type(self):
return "CharField"
def to_python(self, value):
if isinstance(value, str) or value is None:
return value
return str(value)
def get_prep_value(self, value):
value = super().get_prep_value(value)
return self.to_python(value)
def formfield(self, **kwargs):
# Passing max_length to forms.CharField means that the value's length
# will be validated twice. This is considered acceptable since we want
# the value in the form field (to pass into widget for example).
defaults = {'max_length': self.max_length}
# TODO: Handle multiple backends with different feature flags.
if self.null and not connection.features.interprets_empty_strings_as_nulls:
defaults['empty_value'] = None
defaults.update(kwargs)
return super().formfield(**defaults)
class CommaSeparatedIntegerField(CharField):
default_validators = [validators.validate_comma_separated_integer_list]
description = _("Comma-separated integers")
system_check_removed_details = {
'msg': (
'CommaSeparatedIntegerField is removed except for support in '
'historical migrations.'
),
'hint': (
'Use CharField(validators=[validate_comma_separated_integer_list]) '
'instead.'
),
'id': 'fields.E901',
}
class DateTimeCheckMixin:
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_mutually_exclusive_options(),
*self._check_fix_default_value(),
]
def _check_mutually_exclusive_options(self):
# auto_now, auto_now_add, and default are mutually exclusive
# options. The use of more than one of these options together
# will trigger an Error
mutually_exclusive_options = [self.auto_now_add, self.auto_now, self.has_default()]
enabled_options = [option not in (None, False) for option in mutually_exclusive_options].count(True)
if enabled_options > 1:
return [
checks.Error(
"The options auto_now, auto_now_add, and default "
"are mutually exclusive. Only one of these options "
"may be present.",
obj=self,
id='fields.E160',
)
]
else:
return []
def _check_fix_default_value(self):
return []
class DateField(DateTimeCheckMixin, Field):
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value has an invalid date format. It must be '
'in YYYY-MM-DD format.'),
'invalid_date': _('“%(value)s” value has the correct format (YYYY-MM-DD) '
'but it is an invalid date.'),
}
description = _("Date (without time)")
def __init__(self, verbose_name=None, name=None, auto_now=False,
auto_now_add=False, **kwargs):
self.auto_now, self.auto_now_add = auto_now, auto_now_add
if auto_now or auto_now_add:
kwargs['editable'] = False
kwargs['blank'] = True
super().__init__(verbose_name, name, **kwargs)
def _check_fix_default_value(self):
"""
Warn that using an actual date or datetime value is probably wrong;
it's only evaluated on server startup.
"""
if not self.has_default():
return []
now = timezone.now()
if not timezone.is_naive(now):
now = timezone.make_naive(now, timezone.utc)
value = self.default
if isinstance(value, datetime.datetime):
if not timezone.is_naive(value):
value = timezone.make_naive(value, timezone.utc)
value = value.date()
elif isinstance(value, datetime.date):
# Nothing to do, as dates don't have tz information
pass
else:
# No explicit date / datetime value -- no checks necessary
return []
offset = datetime.timedelta(days=1)
lower = (now - offset).date()
upper = (now + offset).date()
if lower <= value <= upper:
return [
checks.Warning(
'Fixed default value provided.',
hint='It seems you set a fixed date / time / datetime '
'value as default for this field. This may not be '
'what you want. If you want to have the current date '
'as default, use `django.utils.timezone.now`',
obj=self,
id='fields.W161',
)
]
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.auto_now:
kwargs['auto_now'] = True
if self.auto_now_add:
kwargs['auto_now_add'] = True
if self.auto_now or self.auto_now_add:
del kwargs['editable']
del kwargs['blank']
return name, path, args, kwargs
def get_internal_type(self):
return "DateField"
def to_python(self, value):
if value is None:
return value
if isinstance(value, datetime.datetime):
if settings.USE_TZ and timezone.is_aware(value):
# Convert aware datetimes to the default time zone
# before casting them to dates (#17742).
default_timezone = timezone.get_default_timezone()
value = timezone.make_naive(value, default_timezone)
return value.date()
if isinstance(value, datetime.date):
return value
try:
parsed = parse_date(value)
if parsed is not None:
return parsed
except ValueError:
raise exceptions.ValidationError(
self.error_messages['invalid_date'],
code='invalid_date',
params={'value': value},
)
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def pre_save(self, model_instance, add):
if self.auto_now or (self.auto_now_add and add):
value = datetime.date.today()
setattr(model_instance, self.attname, value)
return value
else:
return super().pre_save(model_instance, add)
def contribute_to_class(self, cls, name, **kwargs):
super().contribute_to_class(cls, name, **kwargs)
if not self.null:
setattr(
cls, 'get_next_by_%s' % self.name,
partialmethod(cls._get_next_or_previous_by_FIELD, field=self, is_next=True)
)
setattr(
cls, 'get_previous_by_%s' % self.name,
partialmethod(cls._get_next_or_previous_by_FIELD, field=self, is_next=False)
)
def get_prep_value(self, value):
value = super().get_prep_value(value)
return self.to_python(value)
def get_db_prep_value(self, value, connection, prepared=False):
# Casts dates into the format expected by the backend
if not prepared:
value = self.get_prep_value(value)
return connection.ops.adapt_datefield_value(value)
def value_to_string(self, obj):
val = self.value_from_object(obj)
return '' if val is None else val.isoformat()
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.DateField,
**kwargs,
})
class DateTimeField(DateField):
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value has an invalid format. It must be in '
'YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ] format.'),
'invalid_date': _("“%(value)s” value has the correct format "
"(YYYY-MM-DD) but it is an invalid date."),
'invalid_datetime': _('“%(value)s” value has the correct format '
'(YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ]) '
'but it is an invalid date/time.'),
}
description = _("Date (with time)")
# __init__ is inherited from DateField
def _check_fix_default_value(self):
"""
Warn that using an actual date or datetime value is probably wrong;
it's only evaluated on server startup.
"""
if not self.has_default():
return []
now = timezone.now()
if not timezone.is_naive(now):
now = timezone.make_naive(now, timezone.utc)
value = self.default
if isinstance(value, datetime.datetime):
second_offset = datetime.timedelta(seconds=10)
lower = now - second_offset
upper = now + second_offset
if timezone.is_aware(value):
value = timezone.make_naive(value, timezone.utc)
elif isinstance(value, datetime.date):
second_offset = datetime.timedelta(seconds=10)
lower = now - second_offset
lower = datetime.datetime(lower.year, lower.month, lower.day)
upper = now + second_offset
upper = datetime.datetime(upper.year, upper.month, upper.day)
value = datetime.datetime(value.year, value.month, value.day)
else:
# No explicit date / datetime value -- no checks necessary
return []
if lower <= value <= upper:
return [
checks.Warning(
'Fixed default value provided.',
hint='It seems you set a fixed date / time / datetime '
'value as default for this field. This may not be '
'what you want. If you want to have the current date '
'as default, use `django.utils.timezone.now`',
obj=self,
id='fields.W161',
)
]
return []
def get_internal_type(self):
return "DateTimeField"
def to_python(self, value):
if value is None:
return value
if isinstance(value, datetime.datetime):
return value
if isinstance(value, datetime.date):
value = datetime.datetime(value.year, value.month, value.day)
if settings.USE_TZ:
# For backwards compatibility, interpret naive datetimes in
# local time. This won't work during DST change, but we can't
# do much about it, so we let the exceptions percolate up the
# call stack.
warnings.warn("DateTimeField %s.%s received a naive datetime "
"(%s) while time zone support is active." %
(self.model.__name__, self.name, value),
RuntimeWarning)
default_timezone = timezone.get_default_timezone()
value = timezone.make_aware(value, default_timezone)
return value
try:
parsed = parse_datetime(value)
if parsed is not None:
return parsed
except ValueError:
raise exceptions.ValidationError(
self.error_messages['invalid_datetime'],
code='invalid_datetime',
params={'value': value},
)
try:
parsed = parse_date(value)
if parsed is not None:
return datetime.datetime(parsed.year, parsed.month, parsed.day)
except ValueError:
raise exceptions.ValidationError(
self.error_messages['invalid_date'],
code='invalid_date',
params={'value': value},
)
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def pre_save(self, model_instance, add):
if self.auto_now or (self.auto_now_add and add):
value = timezone.now()
setattr(model_instance, self.attname, value)
return value
else:
return super().pre_save(model_instance, add)
# contribute_to_class is inherited from DateField, it registers
# get_next_by_FOO and get_prev_by_FOO
def get_prep_value(self, value):
value = super().get_prep_value(value)
value = self.to_python(value)
if value is not None and settings.USE_TZ and timezone.is_naive(value):
# For backwards compatibility, interpret naive datetimes in local
# time. This won't work during DST change, but we can't do much
# about it, so we let the exceptions percolate up the call stack.
try:
name = '%s.%s' % (self.model.__name__, self.name)
except AttributeError:
name = '(unbound)'
warnings.warn("DateTimeField %s received a naive datetime (%s)"
" while time zone support is active." %
(name, value),
RuntimeWarning)
default_timezone = timezone.get_default_timezone()
value = timezone.make_aware(value, default_timezone)
return value
def get_db_prep_value(self, value, connection, prepared=False):
# Casts datetimes into the format expected by the backend
if not prepared:
value = self.get_prep_value(value)
return connection.ops.adapt_datetimefield_value(value)
def value_to_string(self, obj):
val = self.value_from_object(obj)
return '' if val is None else val.isoformat()
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.DateTimeField,
**kwargs,
})
class DecimalField(Field):
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value must be a decimal number.'),
}
description = _("Decimal number")
def __init__(self, verbose_name=None, name=None, max_digits=None,
decimal_places=None, **kwargs):
self.max_digits, self.decimal_places = max_digits, decimal_places
super().__init__(verbose_name, name, **kwargs)
def check(self, **kwargs):
errors = super().check(**kwargs)
digits_errors = [
*self._check_decimal_places(),
*self._check_max_digits(),
]
if not digits_errors:
errors.extend(self._check_decimal_places_and_max_digits(**kwargs))
else:
errors.extend(digits_errors)
return errors
def _check_decimal_places(self):
try:
decimal_places = int(self.decimal_places)
if decimal_places < 0:
raise ValueError()
except TypeError:
return [
checks.Error(
"DecimalFields must define a 'decimal_places' attribute.",
obj=self,
id='fields.E130',
)
]
except ValueError:
return [
checks.Error(
"'decimal_places' must be a non-negative integer.",
obj=self,
id='fields.E131',
)
]
else:
return []
def _check_max_digits(self):
try:
max_digits = int(self.max_digits)
if max_digits <= 0:
raise ValueError()
except TypeError:
return [
checks.Error(
"DecimalFields must define a 'max_digits' attribute.",
obj=self,
id='fields.E132',
)
]
except ValueError:
return [
checks.Error(
"'max_digits' must be a positive integer.",
obj=self,
id='fields.E133',
)
]
else:
return []
def _check_decimal_places_and_max_digits(self, **kwargs):
if int(self.decimal_places) > int(self.max_digits):
return [
checks.Error(
"'max_digits' must be greater or equal to 'decimal_places'.",
obj=self,
id='fields.E134',
)
]
return []
@cached_property
def validators(self):
return super().validators + [
validators.DecimalValidator(self.max_digits, self.decimal_places)
]
@cached_property
def context(self):
return decimal.Context(prec=self.max_digits)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.max_digits is not None:
kwargs['max_digits'] = self.max_digits
if self.decimal_places is not None:
kwargs['decimal_places'] = self.decimal_places
return name, path, args, kwargs
def get_internal_type(self):
return "DecimalField"
def to_python(self, value):
if value is None:
return value
if isinstance(value, float):
return self.context.create_decimal_from_float(value)
try:
return decimal.Decimal(value)
except decimal.InvalidOperation:
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def get_db_prep_save(self, value, connection):
return connection.ops.adapt_decimalfield_value(self.to_python(value), self.max_digits, self.decimal_places)
def get_prep_value(self, value):
value = super().get_prep_value(value)
return self.to_python(value)
def formfield(self, **kwargs):
return super().formfield(**{
'max_digits': self.max_digits,
'decimal_places': self.decimal_places,
'form_class': forms.DecimalField,
**kwargs,
})
class DurationField(Field):
"""
Store timedelta objects.
Use interval on PostgreSQL, INTERVAL DAY TO SECOND on Oracle, and bigint
of microseconds on other databases.
"""
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value has an invalid format. It must be in '
'[DD] [[HH:]MM:]ss[.uuuuuu] format.')
}
description = _("Duration")
def get_internal_type(self):
return "DurationField"
def to_python(self, value):
if value is None:
return value
if isinstance(value, datetime.timedelta):
return value
try:
parsed = parse_duration(value)
except ValueError:
pass
else:
if parsed is not None:
return parsed
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def get_db_prep_value(self, value, connection, prepared=False):
if connection.features.has_native_duration_field:
return value
if value is None:
return None
return duration_microseconds(value)
def get_db_converters(self, connection):
converters = []
if not connection.features.has_native_duration_field:
converters.append(connection.ops.convert_durationfield_value)
return converters + super().get_db_converters(connection)
def value_to_string(self, obj):
val = self.value_from_object(obj)
return '' if val is None else duration_string(val)
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.DurationField,
**kwargs,
})
class EmailField(CharField):
default_validators = [validators.validate_email]
description = _("Email address")
def __init__(self, *args, **kwargs):
# max_length=254 to be compliant with RFCs 3696 and 5321
kwargs.setdefault('max_length', 254)
super().__init__(*args, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
# We do not exclude max_length if it matches default as we want to change
# the default in future.
return name, path, args, kwargs
def formfield(self, **kwargs):
# As with CharField, this will cause email validation to be performed
# twice.
return super().formfield(**{
'form_class': forms.EmailField,
**kwargs,
})
class FilePathField(Field):
description = _("File path")
def __init__(self, verbose_name=None, name=None, path='', match=None,
recursive=False, allow_files=True, allow_folders=False, **kwargs):
self.path, self.match, self.recursive = path, match, recursive
self.allow_files, self.allow_folders = allow_files, allow_folders
kwargs.setdefault('max_length', 100)
super().__init__(verbose_name, name, **kwargs)
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_allowing_files_or_folders(**kwargs),
]
def _check_allowing_files_or_folders(self, **kwargs):
if not self.allow_files and not self.allow_folders:
return [
checks.Error(
"FilePathFields must have either 'allow_files' or 'allow_folders' set to True.",
obj=self,
id='fields.E140',
)
]
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.path != '':
kwargs['path'] = self.path
if self.match is not None:
kwargs['match'] = self.match
if self.recursive is not False:
kwargs['recursive'] = self.recursive
if self.allow_files is not True:
kwargs['allow_files'] = self.allow_files
if self.allow_folders is not False:
kwargs['allow_folders'] = self.allow_folders
if kwargs.get("max_length") == 100:
del kwargs["max_length"]
return name, path, args, kwargs
def get_prep_value(self, value):
value = super().get_prep_value(value)
if value is None:
return None
return str(value)
def formfield(self, **kwargs):
return super().formfield(**{
'path': self.path() if callable(self.path) else self.path,
'match': self.match,
'recursive': self.recursive,
'form_class': forms.FilePathField,
'allow_files': self.allow_files,
'allow_folders': self.allow_folders,
**kwargs,
})
def get_internal_type(self):
return "FilePathField"
class FloatField(Field):
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value must be a float.'),
}
description = _("Floating point number")
def get_prep_value(self, value):
value = super().get_prep_value(value)
if value is None:
return None
try:
return float(value)
except (TypeError, ValueError) as e:
raise e.__class__(
"Field '%s' expected a number but got %r." % (self.name, value),
) from e
def get_internal_type(self):
return "FloatField"
def to_python(self, value):
if value is None:
return value
try:
return float(value)
except (TypeError, ValueError):
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.FloatField,
**kwargs,
})
class IntegerField(Field):
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value must be an integer.'),
}
description = _("Integer")
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_max_length_warning(),
]
def _check_max_length_warning(self):
if self.max_length is not None:
return [
checks.Warning(
"'max_length' is ignored when used with %s." % self.__class__.__name__,
hint="Remove 'max_length' from field",
obj=self,
id='fields.W122',
)
]
return []
@cached_property
def validators(self):
# These validators can't be added at field initialization time since
# they're based on values retrieved from `connection`.
validators_ = super().validators
internal_type = self.get_internal_type()
min_value, max_value = connection.ops.integer_field_range(internal_type)
if min_value is not None and not any(
(
isinstance(validator, validators.MinValueValidator) and (
validator.limit_value()
if callable(validator.limit_value)
else validator.limit_value
) >= min_value
) for validator in validators_
):
validators_.append(validators.MinValueValidator(min_value))
if max_value is not None and not any(
(
isinstance(validator, validators.MaxValueValidator) and (
validator.limit_value()
if callable(validator.limit_value)
else validator.limit_value
) <= max_value
) for validator in validators_
):
validators_.append(validators.MaxValueValidator(max_value))
return validators_
def get_prep_value(self, value):
value = super().get_prep_value(value)
if value is None:
return None
try:
return int(value)
except (TypeError, ValueError) as e:
raise e.__class__(
"Field '%s' expected a number but got %r." % (self.name, value),
) from e
def get_internal_type(self):
return "IntegerField"
def to_python(self, value):
if value is None:
return value
try:
return int(value)
except (TypeError, ValueError):
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.IntegerField,
**kwargs,
})
class BigIntegerField(IntegerField):
description = _("Big (8 byte) integer")
MAX_BIGINT = 9223372036854775807
def get_internal_type(self):
return "BigIntegerField"
def formfield(self, **kwargs):
return super().formfield(**{
'min_value': -BigIntegerField.MAX_BIGINT - 1,
'max_value': BigIntegerField.MAX_BIGINT,
**kwargs,
})
class IPAddressField(Field):
empty_strings_allowed = False
description = _("IPv4 address")
system_check_removed_details = {
'msg': (
'IPAddressField has been removed except for support in '
'historical migrations.'
),
'hint': 'Use GenericIPAddressField instead.',
'id': 'fields.E900',
}
def __init__(self, *args, **kwargs):
kwargs['max_length'] = 15
super().__init__(*args, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
del kwargs['max_length']
return name, path, args, kwargs
def get_prep_value(self, value):
value = super().get_prep_value(value)
if value is None:
return None
return str(value)
def get_internal_type(self):
return "IPAddressField"
class GenericIPAddressField(Field):
empty_strings_allowed = False
description = _("IP address")
default_error_messages = {}
def __init__(self, verbose_name=None, name=None, protocol='both',
unpack_ipv4=False, *args, **kwargs):
self.unpack_ipv4 = unpack_ipv4
self.protocol = protocol
self.default_validators, invalid_error_message = \
validators.ip_address_validators(protocol, unpack_ipv4)
self.default_error_messages['invalid'] = invalid_error_message
kwargs['max_length'] = 39
super().__init__(verbose_name, name, *args, **kwargs)
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_blank_and_null_values(**kwargs),
]
def _check_blank_and_null_values(self, **kwargs):
if not getattr(self, 'null', False) and getattr(self, 'blank', False):
return [
checks.Error(
'GenericIPAddressFields cannot have blank=True if null=False, '
'as blank values are stored as nulls.',
obj=self,
id='fields.E150',
)
]
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.unpack_ipv4 is not False:
kwargs['unpack_ipv4'] = self.unpack_ipv4
if self.protocol != "both":
kwargs['protocol'] = self.protocol
if kwargs.get("max_length") == 39:
del kwargs['max_length']
return name, path, args, kwargs
def get_internal_type(self):
return "GenericIPAddressField"
def to_python(self, value):
if value is None:
return None
if not isinstance(value, str):
value = str(value)
value = value.strip()
if ':' in value:
return clean_ipv6_address(value, self.unpack_ipv4, self.error_messages['invalid'])
return value
def get_db_prep_value(self, value, connection, prepared=False):
if not prepared:
value = self.get_prep_value(value)
return connection.ops.adapt_ipaddressfield_value(value)
def get_prep_value(self, value):
value = super().get_prep_value(value)
if value is None:
return None
if value and ':' in value:
try:
return clean_ipv6_address(value, self.unpack_ipv4)
except exceptions.ValidationError:
pass
return str(value)
def formfield(self, **kwargs):
return super().formfield(**{
'protocol': self.protocol,
'form_class': forms.GenericIPAddressField,
**kwargs,
})
class NullBooleanField(BooleanField):
default_error_messages = {
'invalid': _('“%(value)s” value must be either None, True or False.'),
'invalid_nullable': _('“%(value)s” value must be either None, True or False.'),
}
description = _("Boolean (Either True, False or None)")
def __init__(self, *args, **kwargs):
kwargs['null'] = True
kwargs['blank'] = True
super().__init__(*args, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
del kwargs['null']
del kwargs['blank']
return name, path, args, kwargs
def get_internal_type(self):
return "NullBooleanField"
class PositiveIntegerRelDbTypeMixin:
def rel_db_type(self, connection):
"""
Return the data type that a related field pointing to this field should
use. In most cases, a foreign key pointing to a positive integer
primary key will have an integer column data type but some databases
(e.g. MySQL) have an unsigned integer type. In that case
(related_fields_match_type=True), the primary key should return its
db_type.
"""
if connection.features.related_fields_match_type:
return self.db_type(connection)
else:
return IntegerField().db_type(connection=connection)
class PositiveBigIntegerField(PositiveIntegerRelDbTypeMixin, IntegerField):
description = _('Positive big integer')
def get_internal_type(self):
return 'PositiveBigIntegerField'
def formfield(self, **kwargs):
return super().formfield(**{
'min_value': 0,
**kwargs,
})
class PositiveIntegerField(PositiveIntegerRelDbTypeMixin, IntegerField):
description = _("Positive integer")
def get_internal_type(self):
return "PositiveIntegerField"
def formfield(self, **kwargs):
return super().formfield(**{
'min_value': 0,
**kwargs,
})
class PositiveSmallIntegerField(PositiveIntegerRelDbTypeMixin, IntegerField):
description = _("Positive small integer")
def get_internal_type(self):
return "PositiveSmallIntegerField"
def formfield(self, **kwargs):
return super().formfield(**{
'min_value': 0,
**kwargs,
})
class SlugField(CharField):
default_validators = [validators.validate_slug]
description = _("Slug (up to %(max_length)s)")
def __init__(self, *args, max_length=50, db_index=True, allow_unicode=False, **kwargs):
self.allow_unicode = allow_unicode
if self.allow_unicode:
self.default_validators = [validators.validate_unicode_slug]
super().__init__(*args, max_length=max_length, db_index=db_index, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if kwargs.get("max_length") == 50:
del kwargs['max_length']
if self.db_index is False:
kwargs['db_index'] = False
else:
del kwargs['db_index']
if self.allow_unicode is not False:
kwargs['allow_unicode'] = self.allow_unicode
return name, path, args, kwargs
def get_internal_type(self):
return "SlugField"
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.SlugField,
'allow_unicode': self.allow_unicode,
**kwargs,
})
class SmallIntegerField(IntegerField):
description = _("Small integer")
def get_internal_type(self):
return "SmallIntegerField"
class TextField(Field):
description = _("Text")
def get_internal_type(self):
return "TextField"
def to_python(self, value):
if isinstance(value, str) or value is None:
return value
return str(value)
def get_prep_value(self, value):
value = super().get_prep_value(value)
return self.to_python(value)
def formfield(self, **kwargs):
# Passing max_length to forms.CharField means that the value's length
# will be validated twice. This is considered acceptable since we want
# the value in the form field (to pass into widget for example).
return super().formfield(**{
'max_length': self.max_length,
**({} if self.choices is not None else {'widget': forms.Textarea}),
**kwargs,
})
class TimeField(DateTimeCheckMixin, Field):
empty_strings_allowed = False
default_error_messages = {
'invalid': _('“%(value)s” value has an invalid format. It must be in '
'HH:MM[:ss[.uuuuuu]] format.'),
'invalid_time': _('“%(value)s” value has the correct format '
'(HH:MM[:ss[.uuuuuu]]) but it is an invalid time.'),
}
description = _("Time")
def __init__(self, verbose_name=None, name=None, auto_now=False,
auto_now_add=False, **kwargs):
self.auto_now, self.auto_now_add = auto_now, auto_now_add
if auto_now or auto_now_add:
kwargs['editable'] = False
kwargs['blank'] = True
super().__init__(verbose_name, name, **kwargs)
def _check_fix_default_value(self):
"""
Warn that using an actual date or datetime value is probably wrong;
it's only evaluated on server startup.
"""
if not self.has_default():
return []
now = timezone.now()
if not timezone.is_naive(now):
now = timezone.make_naive(now, timezone.utc)
value = self.default
if isinstance(value, datetime.datetime):
second_offset = datetime.timedelta(seconds=10)
lower = now - second_offset
upper = now + second_offset
if timezone.is_aware(value):
value = timezone.make_naive(value, timezone.utc)
elif isinstance(value, datetime.time):
second_offset = datetime.timedelta(seconds=10)
lower = now - second_offset
upper = now + second_offset
value = datetime.datetime.combine(now.date(), value)
if timezone.is_aware(value):
value = timezone.make_naive(value, timezone.utc).time()
else:
# No explicit time / datetime value -- no checks necessary
return []
if lower <= value <= upper:
return [
checks.Warning(
'Fixed default value provided.',
hint='It seems you set a fixed date / time / datetime '
'value as default for this field. This may not be '
'what you want. If you want to have the current date '
'as default, use `django.utils.timezone.now`',
obj=self,
id='fields.W161',
)
]
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.auto_now is not False:
kwargs["auto_now"] = self.auto_now
if self.auto_now_add is not False:
kwargs["auto_now_add"] = self.auto_now_add
if self.auto_now or self.auto_now_add:
del kwargs['blank']
del kwargs['editable']
return name, path, args, kwargs
def get_internal_type(self):
return "TimeField"
def to_python(self, value):
if value is None:
return None
if isinstance(value, datetime.time):
return value
if isinstance(value, datetime.datetime):
# Not usually a good idea to pass in a datetime here (it loses
# information), but this can be a side-effect of interacting with a
# database backend (e.g. Oracle), so we'll be accommodating.
return value.time()
try:
parsed = parse_time(value)
if parsed is not None:
return parsed
except ValueError:
raise exceptions.ValidationError(
self.error_messages['invalid_time'],
code='invalid_time',
params={'value': value},
)
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def pre_save(self, model_instance, add):
if self.auto_now or (self.auto_now_add and add):
value = datetime.datetime.now().time()
setattr(model_instance, self.attname, value)
return value
else:
return super().pre_save(model_instance, add)
def get_prep_value(self, value):
value = super().get_prep_value(value)
return self.to_python(value)
def get_db_prep_value(self, value, connection, prepared=False):
# Casts times into the format expected by the backend
if not prepared:
value = self.get_prep_value(value)
return connection.ops.adapt_timefield_value(value)
def value_to_string(self, obj):
val = self.value_from_object(obj)
return '' if val is None else val.isoformat()
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.TimeField,
**kwargs,
})
class URLField(CharField):
default_validators = [validators.URLValidator()]
description = _("URL")
def __init__(self, verbose_name=None, name=None, **kwargs):
kwargs.setdefault('max_length', 200)
super().__init__(verbose_name, name, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if kwargs.get("max_length") == 200:
del kwargs['max_length']
return name, path, args, kwargs
def formfield(self, **kwargs):
# As with CharField, this will cause URL validation to be performed
# twice.
return super().formfield(**{
'form_class': forms.URLField,
**kwargs,
})
class BinaryField(Field):
description = _("Raw binary data")
empty_values = [None, b'']
def __init__(self, *args, **kwargs):
kwargs.setdefault('editable', False)
super().__init__(*args, **kwargs)
if self.max_length is not None:
self.validators.append(validators.MaxLengthValidator(self.max_length))
def check(self, **kwargs):
return [*super().check(**kwargs), *self._check_str_default_value()]
def _check_str_default_value(self):
if self.has_default() and isinstance(self.default, str):
return [
checks.Error(
"BinaryField's default cannot be a string. Use bytes "
"content instead.",
obj=self,
id='fields.E170',
)
]
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.editable:
kwargs['editable'] = True
else:
del kwargs['editable']
return name, path, args, kwargs
def get_internal_type(self):
return "BinaryField"
def get_placeholder(self, value, compiler, connection):
return connection.ops.binary_placeholder_sql(value)
def get_default(self):
if self.has_default() and not callable(self.default):
return self.default
default = super().get_default()
if default == '':
return b''
return default
def get_db_prep_value(self, value, connection, prepared=False):
value = super().get_db_prep_value(value, connection, prepared)
if value is not None:
return connection.Database.Binary(value)
return value
def value_to_string(self, obj):
"""Binary data is serialized as base64"""
return b64encode(self.value_from_object(obj)).decode('ascii')
def to_python(self, value):
# If it's a string, it should be base64-encoded data
if isinstance(value, str):
return memoryview(b64decode(value.encode('ascii')))
return value
class UUIDField(Field):
default_error_messages = {
'invalid': _('“%(value)s” is not a valid UUID.'),
}
description = _('Universally unique identifier')
empty_strings_allowed = False
def __init__(self, verbose_name=None, **kwargs):
kwargs['max_length'] = 32
super().__init__(verbose_name, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
del kwargs['max_length']
return name, path, args, kwargs
def get_internal_type(self):
return "UUIDField"
def get_prep_value(self, value):
value = super().get_prep_value(value)
return self.to_python(value)
def get_db_prep_value(self, value, connection, prepared=False):
if value is None:
return None
if not isinstance(value, uuid.UUID):
value = self.to_python(value)
if connection.features.has_native_uuid_field:
return value
return value.hex
def to_python(self, value):
if value is not None and not isinstance(value, uuid.UUID):
input_form = 'int' if isinstance(value, int) else 'hex'
try:
return uuid.UUID(**{input_form: value})
except (AttributeError, ValueError):
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
return value
def formfield(self, **kwargs):
return super().formfield(**{
'form_class': forms.UUIDField,
**kwargs,
})
class AutoFieldMixin:
db_returning = True
def __init__(self, *args, **kwargs):
kwargs['blank'] = True
super().__init__(*args, **kwargs)
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_primary_key(),
]
def _check_primary_key(self):
if not self.primary_key:
return [
checks.Error(
'AutoFields must set primary_key=True.',
obj=self,
id='fields.E100',
),
]
else:
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
del kwargs['blank']
kwargs['primary_key'] = True
return name, path, args, kwargs
def validate(self, value, model_instance):
pass
def get_db_prep_value(self, value, connection, prepared=False):
if not prepared:
value = self.get_prep_value(value)
value = connection.ops.validate_autopk_value(value)
return value
def contribute_to_class(self, cls, name, **kwargs):
assert not cls._meta.auto_field, (
"Model %s can't have more than one auto-generated field."
% cls._meta.label
)
super().contribute_to_class(cls, name, **kwargs)
cls._meta.auto_field = self
def formfield(self, **kwargs):
return None
class AutoFieldMeta(type):
"""
Metaclass to maintain backward inheritance compatibility for AutoField.
It is intended that AutoFieldMixin become public API when it is possible to
create a non-integer automatically-generated field using column defaults
stored in the database.
In many areas Django also relies on using isinstance() to check for an
automatically-generated field as a subclass of AutoField. A new flag needs
to be implemented on Field to be used instead.
When these issues have been addressed, this metaclass could be used to
deprecate inheritance from AutoField and use of isinstance() with AutoField
for detecting automatically-generated fields.
"""
@property
def _subclasses(self):
return (BigAutoField, SmallAutoField)
def __instancecheck__(self, instance):
return isinstance(instance, self._subclasses) or super().__instancecheck__(instance)
def __subclasscheck__(self, subclass):
return subclass in self._subclasses or super().__subclasscheck__(subclass)
class AutoField(AutoFieldMixin, IntegerField, metaclass=AutoFieldMeta):
def get_internal_type(self):
return 'AutoField'
def rel_db_type(self, connection):
return IntegerField().db_type(connection=connection)
class BigAutoField(AutoFieldMixin, BigIntegerField):
def get_internal_type(self):
return 'BigAutoField'
def rel_db_type(self, connection):
return BigIntegerField().db_type(connection=connection)
class SmallAutoField(AutoFieldMixin, SmallIntegerField):
def get_internal_type(self):
return 'SmallAutoField'
def rel_db_type(self, connection):
return SmallIntegerField().db_type(connection=connection)
|
e6d8d7ea25a0d9dcb1d602559ee9facfdbc73c4e2e24e404ea310745ed21ff49 | """
Create SQL statements for QuerySets.
The code in here encapsulates all of the SQL construction so that QuerySets
themselves do not have to (and could be backed by things other than SQL
databases). The abstraction barrier only works one way: this module has to know
all about the internals of models in order to get the information it needs.
"""
import copy
import difflib
import functools
import inspect
import sys
import warnings
from collections import Counter, namedtuple
from collections.abc import Iterator, Mapping
from itertools import chain, count, product
from string import ascii_uppercase
from django.core.exceptions import (
EmptyResultSet, FieldDoesNotExist, FieldError,
)
from django.db import DEFAULT_DB_ALIAS, NotSupportedError, connections
from django.db.models.aggregates import Count
from django.db.models.constants import LOOKUP_SEP
from django.db.models.expressions import BaseExpression, Col, F, OuterRef, Ref
from django.db.models.fields import Field
from django.db.models.fields.related_lookups import MultiColSource
from django.db.models.lookups import Lookup
from django.db.models.query_utils import (
Q, check_rel_lookup_compatibility, refs_expression,
)
from django.db.models.sql.constants import (
INNER, LOUTER, ORDER_DIR, ORDER_PATTERN, SINGLE,
)
from django.db.models.sql.datastructures import (
BaseTable, Empty, Join, MultiJoin,
)
from django.db.models.sql.where import (
AND, OR, ExtraWhere, NothingNode, WhereNode,
)
from django.utils.deprecation import RemovedInDjango40Warning
from django.utils.functional import cached_property
from django.utils.tree import Node
__all__ = ['Query', 'RawQuery']
def get_field_names_from_opts(opts):
return set(chain.from_iterable(
(f.name, f.attname) if f.concrete else (f.name,)
for f in opts.get_fields()
))
def get_children_from_q(q):
for child in q.children:
if isinstance(child, Node):
yield from get_children_from_q(child)
else:
yield child
JoinInfo = namedtuple(
'JoinInfo',
('final_field', 'targets', 'opts', 'joins', 'path', 'transform_function')
)
class RawQuery:
"""A single raw SQL query."""
def __init__(self, sql, using, params=None):
self.params = params or ()
self.sql = sql
self.using = using
self.cursor = None
# Mirror some properties of a normal query so that
# the compiler can be used to process results.
self.low_mark, self.high_mark = 0, None # Used for offset/limit
self.extra_select = {}
self.annotation_select = {}
def chain(self, using):
return self.clone(using)
def clone(self, using):
return RawQuery(self.sql, using, params=self.params)
def get_columns(self):
if self.cursor is None:
self._execute_query()
converter = connections[self.using].introspection.identifier_converter
return [converter(column_meta[0])
for column_meta in self.cursor.description]
def __iter__(self):
# Always execute a new query for a new iterator.
# This could be optimized with a cache at the expense of RAM.
self._execute_query()
if not connections[self.using].features.can_use_chunked_reads:
# If the database can't use chunked reads we need to make sure we
# evaluate the entire query up front.
result = list(self.cursor)
else:
result = self.cursor
return iter(result)
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self)
@property
def params_type(self):
return dict if isinstance(self.params, Mapping) else tuple
def __str__(self):
return self.sql % self.params_type(self.params)
def _execute_query(self):
connection = connections[self.using]
# Adapt parameters to the database, as much as possible considering
# that the target type isn't known. See #17755.
params_type = self.params_type
adapter = connection.ops.adapt_unknown_value
if params_type is tuple:
params = tuple(adapter(val) for val in self.params)
elif params_type is dict:
params = {key: adapter(val) for key, val in self.params.items()}
else:
raise RuntimeError("Unexpected params type: %s" % params_type)
self.cursor = connection.cursor()
self.cursor.execute(self.sql, params)
class Query(BaseExpression):
"""A single SQL query."""
alias_prefix = 'T'
subq_aliases = frozenset([alias_prefix])
compiler = 'SQLCompiler'
def __init__(self, model, where=WhereNode, alias_cols=True):
self.model = model
self.alias_refcount = {}
# alias_map is the most important data structure regarding joins.
# It's used for recording which joins exist in the query and what
# types they are. The key is the alias of the joined table (possibly
# the table name) and the value is a Join-like object (see
# sql.datastructures.Join for more information).
self.alias_map = {}
# Whether to provide alias to columns during reference resolving.
self.alias_cols = alias_cols
# Sometimes the query contains references to aliases in outer queries (as
# a result of split_exclude). Correct alias quoting needs to know these
# aliases too.
# Map external tables to whether they are aliased.
self.external_aliases = {}
self.table_map = {} # Maps table names to list of aliases.
self.default_cols = True
self.default_ordering = True
self.standard_ordering = True
self.used_aliases = set()
self.filter_is_sticky = False
self.subquery = False
# SQL-related attributes
# Select and related select clauses are expressions to use in the
# SELECT clause of the query.
# The select is used for cases where we want to set up the select
# clause to contain other than default fields (values(), subqueries...)
# Note that annotations go to annotations dictionary.
self.select = ()
self.where = where()
self.where_class = where
# The group_by attribute can have one of the following forms:
# - None: no group by at all in the query
# - A tuple of expressions: group by (at least) those expressions.
# String refs are also allowed for now.
# - True: group by all select fields of the model
# See compiler.get_group_by() for details.
self.group_by = None
self.order_by = ()
self.low_mark, self.high_mark = 0, None # Used for offset/limit
self.distinct = False
self.distinct_fields = ()
self.select_for_update = False
self.select_for_update_nowait = False
self.select_for_update_skip_locked = False
self.select_for_update_of = ()
self.select_related = False
# Arbitrary limit for select_related to prevents infinite recursion.
self.max_depth = 5
# Holds the selects defined by a call to values() or values_list()
# excluding annotation_select and extra_select.
self.values_select = ()
# SQL annotation-related attributes
self.annotations = {} # Maps alias -> Annotation Expression
self.annotation_select_mask = None
self._annotation_select_cache = None
# Set combination attributes
self.combinator = None
self.combinator_all = False
self.combined_queries = ()
# These are for extensions. The contents are more or less appended
# verbatim to the appropriate clause.
self.extra = {} # Maps col_alias -> (col_sql, params).
self.extra_select_mask = None
self._extra_select_cache = None
self.extra_tables = ()
self.extra_order_by = ()
# A tuple that is a set of model field names and either True, if these
# are the fields to defer, or False if these are the only fields to
# load.
self.deferred_loading = (frozenset(), True)
self._filtered_relations = {}
self.explain_query = False
self.explain_format = None
self.explain_options = {}
@property
def output_field(self):
if len(self.select) == 1:
return self.select[0].field
elif len(self.annotation_select) == 1:
return next(iter(self.annotation_select.values())).output_field
@property
def has_select_fields(self):
return bool(self.select or self.annotation_select_mask or self.extra_select_mask)
@cached_property
def base_table(self):
for alias in self.alias_map:
return alias
def __str__(self):
"""
Return the query as a string of SQL with the parameter values
substituted in (use sql_with_params() to see the unsubstituted string).
Parameter values won't necessarily be quoted correctly, since that is
done by the database interface at execution time.
"""
sql, params = self.sql_with_params()
return sql % params
def sql_with_params(self):
"""
Return the query as an SQL string and the parameters that will be
substituted into the query.
"""
return self.get_compiler(DEFAULT_DB_ALIAS).as_sql()
def __deepcopy__(self, memo):
"""Limit the amount of work when a Query is deepcopied."""
result = self.clone()
memo[id(self)] = result
return result
def get_compiler(self, using=None, connection=None):
if using is None and connection is None:
raise ValueError("Need either using or connection")
if using:
connection = connections[using]
return connection.ops.compiler(self.compiler)(self, connection, using)
def get_meta(self):
"""
Return the Options instance (the model._meta) from which to start
processing. Normally, this is self.model._meta, but it can be changed
by subclasses.
"""
return self.model._meta
def clone(self):
"""
Return a copy of the current Query. A lightweight alternative to
to deepcopy().
"""
obj = Empty()
obj.__class__ = self.__class__
# Copy references to everything.
obj.__dict__ = self.__dict__.copy()
# Clone attributes that can't use shallow copy.
obj.alias_refcount = self.alias_refcount.copy()
obj.alias_map = self.alias_map.copy()
obj.external_aliases = self.external_aliases.copy()
obj.table_map = self.table_map.copy()
obj.where = self.where.clone()
obj.annotations = self.annotations.copy()
if self.annotation_select_mask is None:
obj.annotation_select_mask = None
else:
obj.annotation_select_mask = self.annotation_select_mask.copy()
# _annotation_select_cache cannot be copied, as doing so breaks the
# (necessary) state in which both annotations and
# _annotation_select_cache point to the same underlying objects.
# It will get re-populated in the cloned queryset the next time it's
# used.
obj._annotation_select_cache = None
obj.extra = self.extra.copy()
if self.extra_select_mask is None:
obj.extra_select_mask = None
else:
obj.extra_select_mask = self.extra_select_mask.copy()
if self._extra_select_cache is None:
obj._extra_select_cache = None
else:
obj._extra_select_cache = self._extra_select_cache.copy()
if self.select_related is not False:
# Use deepcopy because select_related stores fields in nested
# dicts.
obj.select_related = copy.deepcopy(obj.select_related)
if 'subq_aliases' in self.__dict__:
obj.subq_aliases = self.subq_aliases.copy()
obj.used_aliases = self.used_aliases.copy()
obj._filtered_relations = self._filtered_relations.copy()
# Clear the cached_property
try:
del obj.base_table
except AttributeError:
pass
return obj
def chain(self, klass=None):
"""
Return a copy of the current Query that's ready for another operation.
The klass argument changes the type of the Query, e.g. UpdateQuery.
"""
obj = self.clone()
if klass and obj.__class__ != klass:
obj.__class__ = klass
if not obj.filter_is_sticky:
obj.used_aliases = set()
obj.filter_is_sticky = False
if hasattr(obj, '_setup_query'):
obj._setup_query()
return obj
def relabeled_clone(self, change_map):
clone = self.clone()
clone.change_aliases(change_map)
return clone
def _get_col(self, target, field, alias):
if not self.alias_cols:
alias = None
return target.get_col(alias, field)
def rewrite_cols(self, annotation, col_cnt):
# We must make sure the inner query has the referred columns in it.
# If we are aggregating over an annotation, then Django uses Ref()
# instances to note this. However, if we are annotating over a column
# of a related model, then it might be that column isn't part of the
# SELECT clause of the inner query, and we must manually make sure
# the column is selected. An example case is:
# .aggregate(Sum('author__awards'))
# Resolving this expression results in a join to author, but there
# is no guarantee the awards column of author is in the select clause
# of the query. Thus we must manually add the column to the inner
# query.
orig_exprs = annotation.get_source_expressions()
new_exprs = []
for expr in orig_exprs:
# FIXME: These conditions are fairly arbitrary. Identify a better
# method of having expressions decide which code path they should
# take.
if isinstance(expr, Ref):
# Its already a Ref to subquery (see resolve_ref() for
# details)
new_exprs.append(expr)
elif isinstance(expr, (WhereNode, Lookup)):
# Decompose the subexpressions further. The code here is
# copied from the else clause, but this condition must appear
# before the contains_aggregate/is_summary condition below.
new_expr, col_cnt = self.rewrite_cols(expr, col_cnt)
new_exprs.append(new_expr)
else:
# Reuse aliases of expressions already selected in subquery.
for col_alias, selected_annotation in self.annotation_select.items():
if selected_annotation == expr:
new_expr = Ref(col_alias, expr)
break
else:
# An expression that is not selected the subquery.
if isinstance(expr, Col) or (expr.contains_aggregate and not expr.is_summary):
# Reference column or another aggregate. Select it
# under a non-conflicting alias.
col_cnt += 1
col_alias = '__col%d' % col_cnt
self.annotations[col_alias] = expr
self.append_annotation_mask([col_alias])
new_expr = Ref(col_alias, expr)
else:
# Some other expression not referencing database values
# directly. Its subexpression might contain Cols.
new_expr, col_cnt = self.rewrite_cols(expr, col_cnt)
new_exprs.append(new_expr)
annotation.set_source_expressions(new_exprs)
return annotation, col_cnt
def get_aggregation(self, using, added_aggregate_names):
"""
Return the dictionary with the values of the existing aggregations.
"""
if not self.annotation_select:
return {}
existing_annotations = [
annotation for alias, annotation
in self.annotations.items()
if alias not in added_aggregate_names
]
# Decide if we need to use a subquery.
#
# Existing annotations would cause incorrect results as get_aggregation()
# must produce just one result and thus must not use GROUP BY. But we
# aren't smart enough to remove the existing annotations from the
# query, so those would force us to use GROUP BY.
#
# If the query has limit or distinct, or uses set operations, then
# those operations must be done in a subquery so that the query
# aggregates on the limit and/or distinct results instead of applying
# the distinct and limit after the aggregation.
if (isinstance(self.group_by, tuple) or self.is_sliced or existing_annotations or
self.distinct or self.combinator):
from django.db.models.sql.subqueries import AggregateQuery
outer_query = AggregateQuery(self.model)
inner_query = self.clone()
inner_query.select_for_update = False
inner_query.select_related = False
inner_query.set_annotation_mask(self.annotation_select)
if not self.is_sliced and not self.distinct_fields:
# Queries with distinct_fields need ordering and when a limit
# is applied we must take the slice from the ordered query.
# Otherwise no need for ordering.
inner_query.clear_ordering(True)
if not inner_query.distinct:
# If the inner query uses default select and it has some
# aggregate annotations, then we must make sure the inner
# query is grouped by the main model's primary key. However,
# clearing the select clause can alter results if distinct is
# used.
has_existing_aggregate_annotations = any(
annotation for annotation in existing_annotations
if getattr(annotation, 'contains_aggregate', True)
)
if inner_query.default_cols and has_existing_aggregate_annotations:
inner_query.group_by = (self.model._meta.pk.get_col(inner_query.get_initial_alias()),)
inner_query.default_cols = False
relabels = {t: 'subquery' for t in inner_query.alias_map}
relabels[None] = 'subquery'
# Remove any aggregates marked for reduction from the subquery
# and move them to the outer AggregateQuery.
col_cnt = 0
for alias, expression in list(inner_query.annotation_select.items()):
annotation_select_mask = inner_query.annotation_select_mask
if expression.is_summary:
expression, col_cnt = inner_query.rewrite_cols(expression, col_cnt)
outer_query.annotations[alias] = expression.relabeled_clone(relabels)
del inner_query.annotations[alias]
annotation_select_mask.remove(alias)
# Make sure the annotation_select wont use cached results.
inner_query.set_annotation_mask(inner_query.annotation_select_mask)
if inner_query.select == () and not inner_query.default_cols and not inner_query.annotation_select_mask:
# In case of Model.objects[0:3].count(), there would be no
# field selected in the inner query, yet we must use a subquery.
# So, make sure at least one field is selected.
inner_query.select = (self.model._meta.pk.get_col(inner_query.get_initial_alias()),)
try:
outer_query.add_subquery(inner_query, using)
except EmptyResultSet:
return {
alias: None
for alias in outer_query.annotation_select
}
else:
outer_query = self
self.select = ()
self.default_cols = False
self.extra = {}
outer_query.clear_ordering(True)
outer_query.clear_limits()
outer_query.select_for_update = False
outer_query.select_related = False
compiler = outer_query.get_compiler(using)
result = compiler.execute_sql(SINGLE)
if result is None:
result = [None] * len(outer_query.annotation_select)
converters = compiler.get_converters(outer_query.annotation_select.values())
result = next(compiler.apply_converters((result,), converters))
return dict(zip(outer_query.annotation_select, result))
def get_count(self, using):
"""
Perform a COUNT() query using the current filter constraints.
"""
obj = self.clone()
obj.add_annotation(Count('*'), alias='__count', is_summary=True)
number = obj.get_aggregation(using, ['__count'])['__count']
if number is None:
number = 0
return number
def has_filters(self):
return self.where
def has_results(self, using):
q = self.clone()
if not q.distinct:
if q.group_by is True:
q.add_fields((f.attname for f in self.model._meta.concrete_fields), False)
# Disable GROUP BY aliases to avoid orphaning references to the
# SELECT clause which is about to be cleared.
q.set_group_by(allow_aliases=False)
q.clear_select_clause()
q.clear_ordering(True)
q.set_limits(high=1)
compiler = q.get_compiler(using=using)
return compiler.has_results()
def explain(self, using, format=None, **options):
q = self.clone()
q.explain_query = True
q.explain_format = format
q.explain_options = options
compiler = q.get_compiler(using=using)
return '\n'.join(compiler.explain_query())
def combine(self, rhs, connector):
"""
Merge the 'rhs' query into the current one (with any 'rhs' effects
being applied *after* (that is, "to the right of") anything in the
current query. 'rhs' is not modified during a call to this function.
The 'connector' parameter describes how to connect filters from the
'rhs' query.
"""
assert self.model == rhs.model, \
"Cannot combine queries on two different base models."
assert not self.is_sliced, \
"Cannot combine queries once a slice has been taken."
assert self.distinct == rhs.distinct, \
"Cannot combine a unique query with a non-unique query."
assert self.distinct_fields == rhs.distinct_fields, \
"Cannot combine queries with different distinct fields."
# Work out how to relabel the rhs aliases, if necessary.
change_map = {}
conjunction = (connector == AND)
# Determine which existing joins can be reused. When combining the
# query with AND we must recreate all joins for m2m filters. When
# combining with OR we can reuse joins. The reason is that in AND
# case a single row can't fulfill a condition like:
# revrel__col=1 & revrel__col=2
# But, there might be two different related rows matching this
# condition. In OR case a single True is enough, so single row is
# enough, too.
#
# Note that we will be creating duplicate joins for non-m2m joins in
# the AND case. The results will be correct but this creates too many
# joins. This is something that could be fixed later on.
reuse = set() if conjunction else set(self.alias_map)
# Base table must be present in the query - this is the same
# table on both sides.
self.get_initial_alias()
joinpromoter = JoinPromoter(connector, 2, False)
joinpromoter.add_votes(
j for j in self.alias_map if self.alias_map[j].join_type == INNER)
rhs_votes = set()
# Now, add the joins from rhs query into the new query (skipping base
# table).
rhs_tables = list(rhs.alias_map)[1:]
for alias in rhs_tables:
join = rhs.alias_map[alias]
# If the left side of the join was already relabeled, use the
# updated alias.
join = join.relabeled_clone(change_map)
new_alias = self.join(join, reuse=reuse)
if join.join_type == INNER:
rhs_votes.add(new_alias)
# We can't reuse the same join again in the query. If we have two
# distinct joins for the same connection in rhs query, then the
# combined query must have two joins, too.
reuse.discard(new_alias)
if alias != new_alias:
change_map[alias] = new_alias
if not rhs.alias_refcount[alias]:
# The alias was unused in the rhs query. Unref it so that it
# will be unused in the new query, too. We have to add and
# unref the alias so that join promotion has information of
# the join type for the unused alias.
self.unref_alias(new_alias)
joinpromoter.add_votes(rhs_votes)
joinpromoter.update_join_types(self)
# Now relabel a copy of the rhs where-clause and add it to the current
# one.
w = rhs.where.clone()
w.relabel_aliases(change_map)
self.where.add(w, connector)
# Selection columns and extra extensions are those provided by 'rhs'.
if rhs.select:
self.set_select([col.relabeled_clone(change_map) for col in rhs.select])
else:
self.select = ()
if connector == OR:
# It would be nice to be able to handle this, but the queries don't
# really make sense (or return consistent value sets). Not worth
# the extra complexity when you can write a real query instead.
if self.extra and rhs.extra:
raise ValueError("When merging querysets using 'or', you cannot have extra(select=...) on both sides.")
self.extra.update(rhs.extra)
extra_select_mask = set()
if self.extra_select_mask is not None:
extra_select_mask.update(self.extra_select_mask)
if rhs.extra_select_mask is not None:
extra_select_mask.update(rhs.extra_select_mask)
if extra_select_mask:
self.set_extra_mask(extra_select_mask)
self.extra_tables += rhs.extra_tables
# Ordering uses the 'rhs' ordering, unless it has none, in which case
# the current ordering is used.
self.order_by = rhs.order_by or self.order_by
self.extra_order_by = rhs.extra_order_by or self.extra_order_by
def deferred_to_data(self, target, callback):
"""
Convert the self.deferred_loading data structure to an alternate data
structure, describing the field that *will* be loaded. This is used to
compute the columns to select from the database and also by the
QuerySet class to work out which fields are being initialized on each
model. Models that have all their fields included aren't mentioned in
the result, only those that have field restrictions in place.
The "target" parameter is the instance that is populated (in place).
The "callback" is a function that is called whenever a (model, field)
pair need to be added to "target". It accepts three parameters:
"target", and the model and list of fields being added for that model.
"""
field_names, defer = self.deferred_loading
if not field_names:
return
orig_opts = self.get_meta()
seen = {}
must_include = {orig_opts.concrete_model: {orig_opts.pk}}
for field_name in field_names:
parts = field_name.split(LOOKUP_SEP)
cur_model = self.model._meta.concrete_model
opts = orig_opts
for name in parts[:-1]:
old_model = cur_model
if name in self._filtered_relations:
name = self._filtered_relations[name].relation_name
source = opts.get_field(name)
if is_reverse_o2o(source):
cur_model = source.related_model
else:
cur_model = source.remote_field.model
opts = cur_model._meta
# Even if we're "just passing through" this model, we must add
# both the current model's pk and the related reference field
# (if it's not a reverse relation) to the things we select.
if not is_reverse_o2o(source):
must_include[old_model].add(source)
add_to_dict(must_include, cur_model, opts.pk)
field = opts.get_field(parts[-1])
is_reverse_object = field.auto_created and not field.concrete
model = field.related_model if is_reverse_object else field.model
model = model._meta.concrete_model
if model == opts.model:
model = cur_model
if not is_reverse_o2o(field):
add_to_dict(seen, model, field)
if defer:
# We need to load all fields for each model, except those that
# appear in "seen" (for all models that appear in "seen"). The only
# slight complexity here is handling fields that exist on parent
# models.
workset = {}
for model, values in seen.items():
for field in model._meta.local_fields:
if field not in values:
m = field.model._meta.concrete_model
add_to_dict(workset, m, field)
for model, values in must_include.items():
# If we haven't included a model in workset, we don't add the
# corresponding must_include fields for that model, since an
# empty set means "include all fields". That's why there's no
# "else" branch here.
if model in workset:
workset[model].update(values)
for model, values in workset.items():
callback(target, model, values)
else:
for model, values in must_include.items():
if model in seen:
seen[model].update(values)
else:
# As we've passed through this model, but not explicitly
# included any fields, we have to make sure it's mentioned
# so that only the "must include" fields are pulled in.
seen[model] = values
# Now ensure that every model in the inheritance chain is mentioned
# in the parent list. Again, it must be mentioned to ensure that
# only "must include" fields are pulled in.
for model in orig_opts.get_parent_list():
seen.setdefault(model, set())
for model, values in seen.items():
callback(target, model, values)
def table_alias(self, table_name, create=False, filtered_relation=None):
"""
Return a table alias for the given table_name and whether this is a
new alias or not.
If 'create' is true, a new alias is always created. Otherwise, the
most recently created alias for the table (if one exists) is reused.
"""
alias_list = self.table_map.get(table_name)
if not create and alias_list:
alias = alias_list[0]
self.alias_refcount[alias] += 1
return alias, False
# Create a new alias for this table.
if alias_list:
alias = '%s%d' % (self.alias_prefix, len(self.alias_map) + 1)
alias_list.append(alias)
else:
# The first occurrence of a table uses the table name directly.
alias = filtered_relation.alias if filtered_relation is not None else table_name
self.table_map[table_name] = [alias]
self.alias_refcount[alias] = 1
return alias, True
def ref_alias(self, alias):
"""Increases the reference count for this alias."""
self.alias_refcount[alias] += 1
def unref_alias(self, alias, amount=1):
"""Decreases the reference count for this alias."""
self.alias_refcount[alias] -= amount
def promote_joins(self, aliases):
"""
Promote recursively the join type of given aliases and its children to
an outer join. If 'unconditional' is False, only promote the join if
it is nullable or the parent join is an outer join.
The children promotion is done to avoid join chains that contain a LOUTER
b INNER c. So, if we have currently a INNER b INNER c and a->b is promoted,
then we must also promote b->c automatically, or otherwise the promotion
of a->b doesn't actually change anything in the query results.
"""
aliases = list(aliases)
while aliases:
alias = aliases.pop(0)
if self.alias_map[alias].join_type is None:
# This is the base table (first FROM entry) - this table
# isn't really joined at all in the query, so we should not
# alter its join type.
continue
# Only the first alias (skipped above) should have None join_type
assert self.alias_map[alias].join_type is not None
parent_alias = self.alias_map[alias].parent_alias
parent_louter = parent_alias and self.alias_map[parent_alias].join_type == LOUTER
already_louter = self.alias_map[alias].join_type == LOUTER
if ((self.alias_map[alias].nullable or parent_louter) and
not already_louter):
self.alias_map[alias] = self.alias_map[alias].promote()
# Join type of 'alias' changed, so re-examine all aliases that
# refer to this one.
aliases.extend(
join for join in self.alias_map
if self.alias_map[join].parent_alias == alias and join not in aliases
)
def demote_joins(self, aliases):
"""
Change join type from LOUTER to INNER for all joins in aliases.
Similarly to promote_joins(), this method must ensure no join chains
containing first an outer, then an inner join are generated. If we
are demoting b->c join in chain a LOUTER b LOUTER c then we must
demote a->b automatically, or otherwise the demotion of b->c doesn't
actually change anything in the query results. .
"""
aliases = list(aliases)
while aliases:
alias = aliases.pop(0)
if self.alias_map[alias].join_type == LOUTER:
self.alias_map[alias] = self.alias_map[alias].demote()
parent_alias = self.alias_map[alias].parent_alias
if self.alias_map[parent_alias].join_type == INNER:
aliases.append(parent_alias)
def reset_refcounts(self, to_counts):
"""
Reset reference counts for aliases so that they match the value passed
in `to_counts`.
"""
for alias, cur_refcount in self.alias_refcount.copy().items():
unref_amount = cur_refcount - to_counts.get(alias, 0)
self.unref_alias(alias, unref_amount)
def change_aliases(self, change_map):
"""
Change the aliases in change_map (which maps old-alias -> new-alias),
relabelling any references to them in select columns and the where
clause.
"""
assert set(change_map).isdisjoint(change_map.values())
# 1. Update references in "select" (normal columns plus aliases),
# "group by" and "where".
self.where.relabel_aliases(change_map)
if isinstance(self.group_by, tuple):
self.group_by = tuple([col.relabeled_clone(change_map) for col in self.group_by])
self.select = tuple([col.relabeled_clone(change_map) for col in self.select])
self.annotations = self.annotations and {
key: col.relabeled_clone(change_map) for key, col in self.annotations.items()
}
# 2. Rename the alias in the internal table/alias datastructures.
for old_alias, new_alias in change_map.items():
if old_alias not in self.alias_map:
continue
alias_data = self.alias_map[old_alias].relabeled_clone(change_map)
self.alias_map[new_alias] = alias_data
self.alias_refcount[new_alias] = self.alias_refcount[old_alias]
del self.alias_refcount[old_alias]
del self.alias_map[old_alias]
table_aliases = self.table_map[alias_data.table_name]
for pos, alias in enumerate(table_aliases):
if alias == old_alias:
table_aliases[pos] = new_alias
break
self.external_aliases = {
# Table is aliased or it's being changed and thus is aliased.
change_map.get(alias, alias): (aliased or alias in change_map)
for alias, aliased in self.external_aliases.items()
}
def bump_prefix(self, outer_query):
"""
Change the alias prefix to the next letter in the alphabet in a way
that the outer query's aliases and this query's aliases will not
conflict. Even tables that previously had no alias will get an alias
after this call.
"""
def prefix_gen():
"""
Generate a sequence of characters in alphabetical order:
-> 'A', 'B', 'C', ...
When the alphabet is finished, the sequence will continue with the
Cartesian product:
-> 'AA', 'AB', 'AC', ...
"""
alphabet = ascii_uppercase
prefix = chr(ord(self.alias_prefix) + 1)
yield prefix
for n in count(1):
seq = alphabet[alphabet.index(prefix):] if prefix else alphabet
for s in product(seq, repeat=n):
yield ''.join(s)
prefix = None
if self.alias_prefix != outer_query.alias_prefix:
# No clashes between self and outer query should be possible.
return
# Explicitly avoid infinite loop. The constant divider is based on how
# much depth recursive subquery references add to the stack. This value
# might need to be adjusted when adding or removing function calls from
# the code path in charge of performing these operations.
local_recursion_limit = sys.getrecursionlimit() // 16
for pos, prefix in enumerate(prefix_gen()):
if prefix not in self.subq_aliases:
self.alias_prefix = prefix
break
if pos > local_recursion_limit:
raise RecursionError(
'Maximum recursion depth exceeded: too many subqueries.'
)
self.subq_aliases = self.subq_aliases.union([self.alias_prefix])
outer_query.subq_aliases = outer_query.subq_aliases.union(self.subq_aliases)
self.change_aliases({
alias: '%s%d' % (self.alias_prefix, pos)
for pos, alias in enumerate(self.alias_map)
})
def get_initial_alias(self):
"""
Return the first alias for this query, after increasing its reference
count.
"""
if self.alias_map:
alias = self.base_table
self.ref_alias(alias)
else:
alias = self.join(BaseTable(self.get_meta().db_table, None))
return alias
def count_active_tables(self):
"""
Return the number of tables in this query with a non-zero reference
count. After execution, the reference counts are zeroed, so tables
added in compiler will not be seen by this method.
"""
return len([1 for count in self.alias_refcount.values() if count])
def join(self, join, reuse=None, reuse_with_filtered_relation=False):
"""
Return an alias for the 'join', either reusing an existing alias for
that join or creating a new one. 'join' is either a
sql.datastructures.BaseTable or Join.
The 'reuse' parameter can be either None which means all joins are
reusable, or it can be a set containing the aliases that can be reused.
The 'reuse_with_filtered_relation' parameter is used when computing
FilteredRelation instances.
A join is always created as LOUTER if the lhs alias is LOUTER to make
sure chains like t1 LOUTER t2 INNER t3 aren't generated. All new
joins are created as LOUTER if the join is nullable.
"""
if reuse_with_filtered_relation and reuse:
reuse_aliases = [
a for a, j in self.alias_map.items()
if a in reuse and j.equals(join, with_filtered_relation=False)
]
else:
reuse_aliases = [
a for a, j in self.alias_map.items()
if (reuse is None or a in reuse) and j == join
]
if reuse_aliases:
if join.table_alias in reuse_aliases:
reuse_alias = join.table_alias
else:
# Reuse the most recent alias of the joined table
# (a many-to-many relation may be joined multiple times).
reuse_alias = reuse_aliases[-1]
self.ref_alias(reuse_alias)
return reuse_alias
# No reuse is possible, so we need a new alias.
alias, _ = self.table_alias(join.table_name, create=True, filtered_relation=join.filtered_relation)
if join.join_type:
if self.alias_map[join.parent_alias].join_type == LOUTER or join.nullable:
join_type = LOUTER
else:
join_type = INNER
join.join_type = join_type
join.table_alias = alias
self.alias_map[alias] = join
return alias
def join_parent_model(self, opts, model, alias, seen):
"""
Make sure the given 'model' is joined in the query. If 'model' isn't
a parent of 'opts' or if it is None this method is a no-op.
The 'alias' is the root alias for starting the join, 'seen' is a dict
of model -> alias of existing joins. It must also contain a mapping
of None -> some alias. This will be returned in the no-op case.
"""
if model in seen:
return seen[model]
chain = opts.get_base_chain(model)
if not chain:
return alias
curr_opts = opts
for int_model in chain:
if int_model in seen:
curr_opts = int_model._meta
alias = seen[int_model]
continue
# Proxy model have elements in base chain
# with no parents, assign the new options
# object and skip to the next base in that
# case
if not curr_opts.parents[int_model]:
curr_opts = int_model._meta
continue
link_field = curr_opts.get_ancestor_link(int_model)
join_info = self.setup_joins([link_field.name], curr_opts, alias)
curr_opts = int_model._meta
alias = seen[int_model] = join_info.joins[-1]
return alias or seen[None]
def add_annotation(self, annotation, alias, is_summary=False):
"""Add a single annotation expression to the Query."""
annotation = annotation.resolve_expression(self, allow_joins=True, reuse=None,
summarize=is_summary)
self.append_annotation_mask([alias])
self.annotations[alias] = annotation
def resolve_expression(self, query, *args, **kwargs):
clone = self.clone()
# Subqueries need to use a different set of aliases than the outer query.
clone.bump_prefix(query)
clone.subquery = True
# It's safe to drop ordering if the queryset isn't using slicing,
# distinct(*fields) or select_for_update().
if (self.low_mark == 0 and self.high_mark is None and
not self.distinct_fields and
not self.select_for_update):
clone.clear_ordering(True)
clone.where.resolve_expression(query, *args, **kwargs)
for key, value in clone.annotations.items():
resolved = value.resolve_expression(query, *args, **kwargs)
if hasattr(resolved, 'external_aliases'):
resolved.external_aliases.update(clone.external_aliases)
clone.annotations[key] = resolved
# Outer query's aliases are considered external.
for alias, table in query.alias_map.items():
clone.external_aliases[alias] = (
(isinstance(table, Join) and table.join_field.related_model._meta.db_table != alias) or
(isinstance(table, BaseTable) and table.table_name != table.table_alias)
)
return clone
def get_external_cols(self):
exprs = chain(self.annotations.values(), self.where.children)
return [
col for col in self._gen_cols(exprs)
if col.alias in self.external_aliases
]
def as_sql(self, compiler, connection):
sql, params = self.get_compiler(connection=connection).as_sql()
if self.subquery:
sql = '(%s)' % sql
return sql, params
def resolve_lookup_value(self, value, can_reuse, allow_joins):
if hasattr(value, 'resolve_expression'):
value = value.resolve_expression(
self, reuse=can_reuse, allow_joins=allow_joins,
)
elif isinstance(value, (list, tuple)):
# The items of the iterable may be expressions and therefore need
# to be resolved independently.
return type(value)(
self.resolve_lookup_value(sub_value, can_reuse, allow_joins)
for sub_value in value
)
return value
def solve_lookup_type(self, lookup):
"""
Solve the lookup type from the lookup (e.g.: 'foobar__id__icontains').
"""
lookup_splitted = lookup.split(LOOKUP_SEP)
if self.annotations:
expression, expression_lookups = refs_expression(lookup_splitted, self.annotations)
if expression:
return expression_lookups, (), expression
_, field, _, lookup_parts = self.names_to_path(lookup_splitted, self.get_meta())
field_parts = lookup_splitted[0:len(lookup_splitted) - len(lookup_parts)]
if len(lookup_parts) > 1 and not field_parts:
raise FieldError(
'Invalid lookup "%s" for model %s".' %
(lookup, self.get_meta().model.__name__)
)
return lookup_parts, field_parts, False
def check_query_object_type(self, value, opts, field):
"""
Check whether the object passed while querying is of the correct type.
If not, raise a ValueError specifying the wrong object.
"""
if hasattr(value, '_meta'):
if not check_rel_lookup_compatibility(value._meta.model, opts, field):
raise ValueError(
'Cannot query "%s": Must be "%s" instance.' %
(value, opts.object_name))
def check_related_objects(self, field, value, opts):
"""Check the type of object passed to query relations."""
if field.is_relation:
# Check that the field and the queryset use the same model in a
# query like .filter(author=Author.objects.all()). For example, the
# opts would be Author's (from the author field) and value.model
# would be Author.objects.all() queryset's .model (Author also).
# The field is the related field on the lhs side.
if (isinstance(value, Query) and not value.has_select_fields and
not check_rel_lookup_compatibility(value.model, opts, field)):
raise ValueError(
'Cannot use QuerySet for "%s": Use a QuerySet for "%s".' %
(value.model._meta.object_name, opts.object_name)
)
elif hasattr(value, '_meta'):
self.check_query_object_type(value, opts, field)
elif hasattr(value, '__iter__'):
for v in value:
self.check_query_object_type(v, opts, field)
def check_filterable(self, expression):
"""Raise an error if expression cannot be used in a WHERE clause."""
if not getattr(expression, 'filterable', True):
raise NotSupportedError(
expression.__class__.__name__ + ' is disallowed in the filter '
'clause.'
)
if hasattr(expression, 'get_source_expressions'):
for expr in expression.get_source_expressions():
self.check_filterable(expr)
def build_lookup(self, lookups, lhs, rhs):
"""
Try to extract transforms and lookup from given lhs.
The lhs value is something that works like SQLExpression.
The rhs value is what the lookup is going to compare against.
The lookups is a list of names to extract using get_lookup()
and get_transform().
"""
# __exact is the default lookup if one isn't given.
*transforms, lookup_name = lookups or ['exact']
for name in transforms:
lhs = self.try_transform(lhs, name)
# First try get_lookup() so that the lookup takes precedence if the lhs
# supports both transform and lookup for the name.
lookup_class = lhs.get_lookup(lookup_name)
if not lookup_class:
if lhs.field.is_relation:
raise FieldError('Related Field got invalid lookup: {}'.format(lookup_name))
# A lookup wasn't found. Try to interpret the name as a transform
# and do an Exact lookup against it.
lhs = self.try_transform(lhs, lookup_name)
lookup_name = 'exact'
lookup_class = lhs.get_lookup(lookup_name)
if not lookup_class:
return
lookup = lookup_class(lhs, rhs)
# Interpret '__exact=None' as the sql 'is NULL'; otherwise, reject all
# uses of None as a query value unless the lookup supports it.
if lookup.rhs is None and not lookup.can_use_none_as_rhs:
if lookup_name not in ('exact', 'iexact'):
raise ValueError("Cannot use None as a query value")
return lhs.get_lookup('isnull')(lhs, True)
# For Oracle '' is equivalent to null. The check must be done at this
# stage because join promotion can't be done in the compiler. Using
# DEFAULT_DB_ALIAS isn't nice but it's the best that can be done here.
# A similar thing is done in is_nullable(), too.
if (connections[DEFAULT_DB_ALIAS].features.interprets_empty_strings_as_nulls and
lookup_name == 'exact' and lookup.rhs == ''):
return lhs.get_lookup('isnull')(lhs, True)
return lookup
def try_transform(self, lhs, name):
"""
Helper method for build_lookup(). Try to fetch and initialize
a transform for name parameter from lhs.
"""
transform_class = lhs.get_transform(name)
if transform_class:
return transform_class(lhs)
else:
output_field = lhs.output_field.__class__
suggested_lookups = difflib.get_close_matches(name, output_field.get_lookups())
if suggested_lookups:
suggestion = ', perhaps you meant %s?' % ' or '.join(suggested_lookups)
else:
suggestion = '.'
raise FieldError(
"Unsupported lookup '%s' for %s or join on the field not "
"permitted%s" % (name, output_field.__name__, suggestion)
)
def build_filter(self, filter_expr, branch_negated=False, current_negated=False,
can_reuse=None, allow_joins=True, split_subq=True,
reuse_with_filtered_relation=False, check_filterable=True):
"""
Build a WhereNode for a single filter clause but don't add it
to this Query. Query.add_q() will then add this filter to the where
Node.
The 'branch_negated' tells us if the current branch contains any
negations. This will be used to determine if subqueries are needed.
The 'current_negated' is used to determine if the current filter is
negated or not and this will be used to determine if IS NULL filtering
is needed.
The difference between current_negated and branch_negated is that
branch_negated is set on first negation, but current_negated is
flipped for each negation.
Note that add_filter will not do any negating itself, that is done
upper in the code by add_q().
The 'can_reuse' is a set of reusable joins for multijoins.
If 'reuse_with_filtered_relation' is True, then only joins in can_reuse
will be reused.
The method will create a filter clause that can be added to the current
query. However, if the filter isn't added to the query then the caller
is responsible for unreffing the joins used.
"""
if isinstance(filter_expr, dict):
raise FieldError("Cannot parse keyword query as dict")
if isinstance(filter_expr, Q):
return self._add_q(
filter_expr,
branch_negated=branch_negated,
current_negated=current_negated,
used_aliases=can_reuse,
allow_joins=allow_joins,
split_subq=split_subq,
check_filterable=check_filterable,
)
if hasattr(filter_expr, 'resolve_expression'):
if not getattr(filter_expr, 'conditional', False):
raise TypeError('Cannot filter against a non-conditional expression.')
condition = self.build_lookup(
['exact'], filter_expr.resolve_expression(self, allow_joins=allow_joins), True
)
clause = self.where_class()
clause.add(condition, AND)
return clause, []
arg, value = filter_expr
if not arg:
raise FieldError("Cannot parse keyword query %r" % arg)
lookups, parts, reffed_expression = self.solve_lookup_type(arg)
if check_filterable:
self.check_filterable(reffed_expression)
if not allow_joins and len(parts) > 1:
raise FieldError("Joined field references are not permitted in this query")
pre_joins = self.alias_refcount.copy()
value = self.resolve_lookup_value(value, can_reuse, allow_joins)
used_joins = {k for k, v in self.alias_refcount.items() if v > pre_joins.get(k, 0)}
if check_filterable:
self.check_filterable(value)
clause = self.where_class()
if reffed_expression:
condition = self.build_lookup(lookups, reffed_expression, value)
clause.add(condition, AND)
return clause, []
opts = self.get_meta()
alias = self.get_initial_alias()
allow_many = not branch_negated or not split_subq
try:
join_info = self.setup_joins(
parts, opts, alias, can_reuse=can_reuse, allow_many=allow_many,
reuse_with_filtered_relation=reuse_with_filtered_relation,
)
# Prevent iterator from being consumed by check_related_objects()
if isinstance(value, Iterator):
value = list(value)
self.check_related_objects(join_info.final_field, value, join_info.opts)
# split_exclude() needs to know which joins were generated for the
# lookup parts
self._lookup_joins = join_info.joins
except MultiJoin as e:
return self.split_exclude(filter_expr, can_reuse, e.names_with_path)
# Update used_joins before trimming since they are reused to determine
# which joins could be later promoted to INNER.
used_joins.update(join_info.joins)
targets, alias, join_list = self.trim_joins(join_info.targets, join_info.joins, join_info.path)
if can_reuse is not None:
can_reuse.update(join_list)
if join_info.final_field.is_relation:
# No support for transforms for relational fields
num_lookups = len(lookups)
if num_lookups > 1:
raise FieldError('Related Field got invalid lookup: {}'.format(lookups[0]))
if len(targets) == 1:
col = self._get_col(targets[0], join_info.final_field, alias)
else:
col = MultiColSource(alias, targets, join_info.targets, join_info.final_field)
else:
col = self._get_col(targets[0], join_info.final_field, alias)
condition = self.build_lookup(lookups, col, value)
lookup_type = condition.lookup_name
clause.add(condition, AND)
require_outer = lookup_type == 'isnull' and condition.rhs is True and not current_negated
if current_negated and (lookup_type != 'isnull' or condition.rhs is False) and condition.rhs is not None:
require_outer = True
if (lookup_type != 'isnull' and (
self.is_nullable(targets[0]) or
self.alias_map[join_list[-1]].join_type == LOUTER)):
# The condition added here will be SQL like this:
# NOT (col IS NOT NULL), where the first NOT is added in
# upper layers of code. The reason for addition is that if col
# is null, then col != someval will result in SQL "unknown"
# which isn't the same as in Python. The Python None handling
# is wanted, and it can be gotten by
# (col IS NULL OR col != someval)
# <=>
# NOT (col IS NOT NULL AND col = someval).
lookup_class = targets[0].get_lookup('isnull')
col = self._get_col(targets[0], join_info.targets[0], alias)
clause.add(lookup_class(col, False), AND)
return clause, used_joins if not require_outer else ()
def add_filter(self, filter_clause):
self.add_q(Q(**{filter_clause[0]: filter_clause[1]}))
def add_q(self, q_object):
"""
A preprocessor for the internal _add_q(). Responsible for doing final
join promotion.
"""
# For join promotion this case is doing an AND for the added q_object
# and existing conditions. So, any existing inner join forces the join
# type to remain inner. Existing outer joins can however be demoted.
# (Consider case where rel_a is LOUTER and rel_a__col=1 is added - if
# rel_a doesn't produce any rows, then the whole condition must fail.
# So, demotion is OK.
existing_inner = {a for a in self.alias_map if self.alias_map[a].join_type == INNER}
clause, _ = self._add_q(q_object, self.used_aliases)
if clause:
self.where.add(clause, AND)
self.demote_joins(existing_inner)
def build_where(self, filter_expr):
return self.build_filter(filter_expr, allow_joins=False)[0]
def _add_q(self, q_object, used_aliases, branch_negated=False,
current_negated=False, allow_joins=True, split_subq=True,
check_filterable=True):
"""Add a Q-object to the current filter."""
connector = q_object.connector
current_negated = current_negated ^ q_object.negated
branch_negated = branch_negated or q_object.negated
target_clause = self.where_class(connector=connector,
negated=q_object.negated)
joinpromoter = JoinPromoter(q_object.connector, len(q_object.children), current_negated)
for child in q_object.children:
child_clause, needed_inner = self.build_filter(
child, can_reuse=used_aliases, branch_negated=branch_negated,
current_negated=current_negated, allow_joins=allow_joins,
split_subq=split_subq, check_filterable=check_filterable,
)
joinpromoter.add_votes(needed_inner)
if child_clause:
target_clause.add(child_clause, connector)
needed_inner = joinpromoter.update_join_types(self)
return target_clause, needed_inner
def build_filtered_relation_q(self, q_object, reuse, branch_negated=False, current_negated=False):
"""Add a FilteredRelation object to the current filter."""
connector = q_object.connector
current_negated ^= q_object.negated
branch_negated = branch_negated or q_object.negated
target_clause = self.where_class(connector=connector, negated=q_object.negated)
for child in q_object.children:
if isinstance(child, Node):
child_clause = self.build_filtered_relation_q(
child, reuse=reuse, branch_negated=branch_negated,
current_negated=current_negated,
)
else:
child_clause, _ = self.build_filter(
child, can_reuse=reuse, branch_negated=branch_negated,
current_negated=current_negated,
allow_joins=True, split_subq=False,
reuse_with_filtered_relation=True,
)
target_clause.add(child_clause, connector)
return target_clause
def add_filtered_relation(self, filtered_relation, alias):
filtered_relation.alias = alias
lookups = dict(get_children_from_q(filtered_relation.condition))
for lookup in chain((filtered_relation.relation_name,), lookups):
lookup_parts, field_parts, _ = self.solve_lookup_type(lookup)
shift = 2 if not lookup_parts else 1
if len(field_parts) > (shift + len(lookup_parts)):
raise ValueError(
"FilteredRelation's condition doesn't support nested "
"relations (got %r)." % lookup
)
self._filtered_relations[filtered_relation.alias] = filtered_relation
def names_to_path(self, names, opts, allow_many=True, fail_on_missing=False):
"""
Walk the list of names and turns them into PathInfo tuples. A single
name in 'names' can generate multiple PathInfos (m2m, for example).
'names' is the path of names to travel, 'opts' is the model Options we
start the name resolving from, 'allow_many' is as for setup_joins().
If fail_on_missing is set to True, then a name that can't be resolved
will generate a FieldError.
Return a list of PathInfo tuples. In addition return the final field
(the last used join field) and target (which is a field guaranteed to
contain the same value as the final field). Finally, return those names
that weren't found (which are likely transforms and the final lookup).
"""
path, names_with_path = [], []
for pos, name in enumerate(names):
cur_names_with_path = (name, [])
if name == 'pk':
name = opts.pk.name
field = None
filtered_relation = None
try:
field = opts.get_field(name)
except FieldDoesNotExist:
if name in self.annotation_select:
field = self.annotation_select[name].output_field
elif name in self._filtered_relations and pos == 0:
filtered_relation = self._filtered_relations[name]
field = opts.get_field(filtered_relation.relation_name)
if field is not None:
# Fields that contain one-to-many relations with a generic
# model (like a GenericForeignKey) cannot generate reverse
# relations and therefore cannot be used for reverse querying.
if field.is_relation and not field.related_model:
raise FieldError(
"Field %r does not generate an automatic reverse "
"relation and therefore cannot be used for reverse "
"querying. If it is a GenericForeignKey, consider "
"adding a GenericRelation." % name
)
try:
model = field.model._meta.concrete_model
except AttributeError:
# QuerySet.annotate() may introduce fields that aren't
# attached to a model.
model = None
else:
# We didn't find the current field, so move position back
# one step.
pos -= 1
if pos == -1 or fail_on_missing:
available = sorted([
*get_field_names_from_opts(opts),
*self.annotation_select,
*self._filtered_relations,
])
raise FieldError("Cannot resolve keyword '%s' into field. "
"Choices are: %s" % (name, ", ".join(available)))
break
# Check if we need any joins for concrete inheritance cases (the
# field lives in parent, but we are currently in one of its
# children)
if model is not opts.model:
path_to_parent = opts.get_path_to_parent(model)
if path_to_parent:
path.extend(path_to_parent)
cur_names_with_path[1].extend(path_to_parent)
opts = path_to_parent[-1].to_opts
if hasattr(field, 'get_path_info'):
pathinfos = field.get_path_info(filtered_relation)
if not allow_many:
for inner_pos, p in enumerate(pathinfos):
if p.m2m:
cur_names_with_path[1].extend(pathinfos[0:inner_pos + 1])
names_with_path.append(cur_names_with_path)
raise MultiJoin(pos + 1, names_with_path)
last = pathinfos[-1]
path.extend(pathinfos)
final_field = last.join_field
opts = last.to_opts
targets = last.target_fields
cur_names_with_path[1].extend(pathinfos)
names_with_path.append(cur_names_with_path)
else:
# Local non-relational field.
final_field = field
targets = (field,)
if fail_on_missing and pos + 1 != len(names):
raise FieldError(
"Cannot resolve keyword %r into field. Join on '%s'"
" not permitted." % (names[pos + 1], name))
break
return path, final_field, targets, names[pos + 1:]
def setup_joins(self, names, opts, alias, can_reuse=None, allow_many=True,
reuse_with_filtered_relation=False):
"""
Compute the necessary table joins for the passage through the fields
given in 'names'. 'opts' is the Options class for the current model
(which gives the table we are starting from), 'alias' is the alias for
the table to start the joining from.
The 'can_reuse' defines the reverse foreign key joins we can reuse. It
can be None in which case all joins are reusable or a set of aliases
that can be reused. Note that non-reverse foreign keys are always
reusable when using setup_joins().
The 'reuse_with_filtered_relation' can be used to force 'can_reuse'
parameter and force the relation on the given connections.
If 'allow_many' is False, then any reverse foreign key seen will
generate a MultiJoin exception.
Return the final field involved in the joins, the target field (used
for any 'where' constraint), the final 'opts' value, the joins, the
field path traveled to generate the joins, and a transform function
that takes a field and alias and is equivalent to `field.get_col(alias)`
in the simple case but wraps field transforms if they were included in
names.
The target field is the field containing the concrete value. Final
field can be something different, for example foreign key pointing to
that value. Final field is needed for example in some value
conversions (convert 'obj' in fk__id=obj to pk val using the foreign
key field for example).
"""
joins = [alias]
# The transform can't be applied yet, as joins must be trimmed later.
# To avoid making every caller of this method look up transforms
# directly, compute transforms here and create a partial that converts
# fields to the appropriate wrapped version.
def final_transformer(field, alias):
return field.get_col(alias)
# Try resolving all the names as fields first. If there's an error,
# treat trailing names as lookups until a field can be resolved.
last_field_exception = None
for pivot in range(len(names), 0, -1):
try:
path, final_field, targets, rest = self.names_to_path(
names[:pivot], opts, allow_many, fail_on_missing=True,
)
except FieldError as exc:
if pivot == 1:
# The first item cannot be a lookup, so it's safe
# to raise the field error here.
raise
else:
last_field_exception = exc
else:
# The transforms are the remaining items that couldn't be
# resolved into fields.
transforms = names[pivot:]
break
for name in transforms:
def transform(field, alias, *, name, previous):
try:
wrapped = previous(field, alias)
return self.try_transform(wrapped, name)
except FieldError:
# FieldError is raised if the transform doesn't exist.
if isinstance(final_field, Field) and last_field_exception:
raise last_field_exception
else:
raise
final_transformer = functools.partial(transform, name=name, previous=final_transformer)
# Then, add the path to the query's joins. Note that we can't trim
# joins at this stage - we will need the information about join type
# of the trimmed joins.
for join in path:
if join.filtered_relation:
filtered_relation = join.filtered_relation.clone()
table_alias = filtered_relation.alias
else:
filtered_relation = None
table_alias = None
opts = join.to_opts
if join.direct:
nullable = self.is_nullable(join.join_field)
else:
nullable = True
connection = Join(
opts.db_table, alias, table_alias, INNER, join.join_field,
nullable, filtered_relation=filtered_relation,
)
reuse = can_reuse if join.m2m or reuse_with_filtered_relation else None
alias = self.join(
connection, reuse=reuse,
reuse_with_filtered_relation=reuse_with_filtered_relation,
)
joins.append(alias)
if filtered_relation:
filtered_relation.path = joins[:]
return JoinInfo(final_field, targets, opts, joins, path, final_transformer)
def trim_joins(self, targets, joins, path):
"""
The 'target' parameter is the final field being joined to, 'joins'
is the full list of join aliases. The 'path' contain the PathInfos
used to create the joins.
Return the final target field and table alias and the new active
joins.
Always trim any direct join if the target column is already in the
previous table. Can't trim reverse joins as it's unknown if there's
anything on the other side of the join.
"""
joins = joins[:]
for pos, info in enumerate(reversed(path)):
if len(joins) == 1 or not info.direct:
break
if info.filtered_relation:
break
join_targets = {t.column for t in info.join_field.foreign_related_fields}
cur_targets = {t.column for t in targets}
if not cur_targets.issubset(join_targets):
break
targets_dict = {r[1].column: r[0] for r in info.join_field.related_fields if r[1].column in cur_targets}
targets = tuple(targets_dict[t.column] for t in targets)
self.unref_alias(joins.pop())
return targets, joins[-1], joins
@classmethod
def _gen_cols(cls, exprs):
for expr in exprs:
if isinstance(expr, Col):
yield expr
else:
yield from cls._gen_cols(expr.get_source_expressions())
@classmethod
def _gen_col_aliases(cls, exprs):
yield from (expr.alias for expr in cls._gen_cols(exprs))
def resolve_ref(self, name, allow_joins=True, reuse=None, summarize=False):
if not allow_joins and LOOKUP_SEP in name:
raise FieldError("Joined field references are not permitted in this query")
annotation = self.annotations.get(name)
if annotation is not None:
if not allow_joins:
for alias in self._gen_col_aliases([annotation]):
if isinstance(self.alias_map[alias], Join):
raise FieldError(
'Joined field references are not permitted in '
'this query'
)
if summarize:
# Summarize currently means we are doing an aggregate() query
# which is executed as a wrapped subquery if any of the
# aggregate() elements reference an existing annotation. In
# that case we need to return a Ref to the subquery's annotation.
return Ref(name, self.annotation_select[name])
else:
return annotation
else:
field_list = name.split(LOOKUP_SEP)
join_info = self.setup_joins(field_list, self.get_meta(), self.get_initial_alias(), can_reuse=reuse)
targets, final_alias, join_list = self.trim_joins(join_info.targets, join_info.joins, join_info.path)
if not allow_joins and len(join_list) > 1:
raise FieldError('Joined field references are not permitted in this query')
if len(targets) > 1:
raise FieldError("Referencing multicolumn fields with F() objects "
"isn't supported")
# Verify that the last lookup in name is a field or a transform:
# transform_function() raises FieldError if not.
join_info.transform_function(targets[0], final_alias)
if reuse is not None:
reuse.update(join_list)
return self._get_col(targets[0], join_info.targets[0], join_list[-1])
def split_exclude(self, filter_expr, can_reuse, names_with_path):
"""
When doing an exclude against any kind of N-to-many relation, we need
to use a subquery. This method constructs the nested query, given the
original exclude filter (filter_expr) and the portion up to the first
N-to-many relation field.
For example, if the origin filter is ~Q(child__name='foo'), filter_expr
is ('child__name', 'foo') and can_reuse is a set of joins usable for
filters in the original query.
We will turn this into equivalent of:
WHERE NOT (pk IN (SELECT parent_id FROM thetable
WHERE name = 'foo' AND parent_id IS NOT NULL))
It might be worth it to consider using WHERE NOT EXISTS as that has
saner null handling, and is easier for the backend's optimizer to
handle.
"""
filter_lhs, filter_rhs = filter_expr
if isinstance(filter_rhs, OuterRef):
filter_expr = (filter_lhs, OuterRef(filter_rhs))
elif isinstance(filter_rhs, F):
filter_expr = (filter_lhs, OuterRef(filter_rhs.name))
# Generate the inner query.
query = Query(self.model)
query._filtered_relations = self._filtered_relations
query.add_filter(filter_expr)
query.clear_ordering(True)
# Try to have as simple as possible subquery -> trim leading joins from
# the subquery.
trimmed_prefix, contains_louter = query.trim_start(names_with_path)
# Add extra check to make sure the selected field will not be null
# since we are adding an IN <subquery> clause. This prevents the
# database from tripping over IN (...,NULL,...) selects and returning
# nothing
col = query.select[0]
select_field = col.target
alias = col.alias
if self.is_nullable(select_field):
lookup_class = select_field.get_lookup('isnull')
lookup = lookup_class(select_field.get_col(alias), False)
query.where.add(lookup, AND)
if alias in can_reuse:
pk = select_field.model._meta.pk
# Need to add a restriction so that outer query's filters are in effect for
# the subquery, too.
query.bump_prefix(self)
lookup_class = select_field.get_lookup('exact')
# Note that the query.select[0].alias is different from alias
# due to bump_prefix above.
lookup = lookup_class(pk.get_col(query.select[0].alias),
pk.get_col(alias))
query.where.add(lookup, AND)
query.external_aliases[alias] = True
condition, needed_inner = self.build_filter(
('%s__in' % trimmed_prefix, query),
current_negated=True, branch_negated=True, can_reuse=can_reuse)
if contains_louter:
or_null_condition, _ = self.build_filter(
('%s__isnull' % trimmed_prefix, True),
current_negated=True, branch_negated=True, can_reuse=can_reuse)
condition.add(or_null_condition, OR)
# Note that the end result will be:
# (outercol NOT IN innerq AND outercol IS NOT NULL) OR outercol IS NULL.
# This might look crazy but due to how IN works, this seems to be
# correct. If the IS NOT NULL check is removed then outercol NOT
# IN will return UNKNOWN. If the IS NULL check is removed, then if
# outercol IS NULL we will not match the row.
return condition, needed_inner
def set_empty(self):
self.where.add(NothingNode(), AND)
def is_empty(self):
return any(isinstance(c, NothingNode) for c in self.where.children)
def set_limits(self, low=None, high=None):
"""
Adjust the limits on the rows retrieved. Use low/high to set these,
as it makes it more Pythonic to read and write. When the SQL query is
created, convert them to the appropriate offset and limit values.
Apply any limits passed in here to the existing constraints. Add low
to the current low value and clamp both to any existing high value.
"""
if high is not None:
if self.high_mark is not None:
self.high_mark = min(self.high_mark, self.low_mark + high)
else:
self.high_mark = self.low_mark + high
if low is not None:
if self.high_mark is not None:
self.low_mark = min(self.high_mark, self.low_mark + low)
else:
self.low_mark = self.low_mark + low
if self.low_mark == self.high_mark:
self.set_empty()
def clear_limits(self):
"""Clear any existing limits."""
self.low_mark, self.high_mark = 0, None
@property
def is_sliced(self):
return self.low_mark != 0 or self.high_mark is not None
def has_limit_one(self):
return self.high_mark is not None and (self.high_mark - self.low_mark) == 1
def can_filter(self):
"""
Return True if adding filters to this instance is still possible.
Typically, this means no limits or offsets have been put on the results.
"""
return not self.is_sliced
def clear_select_clause(self):
"""Remove all fields from SELECT clause."""
self.select = ()
self.default_cols = False
self.select_related = False
self.set_extra_mask(())
self.set_annotation_mask(())
def clear_select_fields(self):
"""
Clear the list of fields to select (but not extra_select columns).
Some queryset types completely replace any existing list of select
columns.
"""
self.select = ()
self.values_select = ()
def add_select_col(self, col):
self.select += col,
self.values_select += col.output_field.name,
def set_select(self, cols):
self.default_cols = False
self.select = tuple(cols)
def add_distinct_fields(self, *field_names):
"""
Add and resolve the given fields to the query's "distinct on" clause.
"""
self.distinct_fields = field_names
self.distinct = True
def add_fields(self, field_names, allow_m2m=True):
"""
Add the given (model) fields to the select set. Add the field names in
the order specified.
"""
alias = self.get_initial_alias()
opts = self.get_meta()
try:
cols = []
for name in field_names:
# Join promotion note - we must not remove any rows here, so
# if there is no existing joins, use outer join.
join_info = self.setup_joins(name.split(LOOKUP_SEP), opts, alias, allow_many=allow_m2m)
targets, final_alias, joins = self.trim_joins(
join_info.targets,
join_info.joins,
join_info.path,
)
for target in targets:
cols.append(join_info.transform_function(target, final_alias))
if cols:
self.set_select(cols)
except MultiJoin:
raise FieldError("Invalid field name: '%s'" % name)
except FieldError:
if LOOKUP_SEP in name:
# For lookups spanning over relationships, show the error
# from the model on which the lookup failed.
raise
else:
names = sorted([
*get_field_names_from_opts(opts), *self.extra,
*self.annotation_select, *self._filtered_relations
])
raise FieldError("Cannot resolve keyword %r into field. "
"Choices are: %s" % (name, ", ".join(names)))
def add_ordering(self, *ordering):
"""
Add items from the 'ordering' sequence to the query's "order by"
clause. These items are either field names (not column names) --
possibly with a direction prefix ('-' or '?') -- or OrderBy
expressions.
If 'ordering' is empty, clear all ordering from the query.
"""
errors = []
for item in ordering:
if not hasattr(item, 'resolve_expression') and not ORDER_PATTERN.match(item):
errors.append(item)
if getattr(item, 'contains_aggregate', False):
raise FieldError(
'Using an aggregate in order_by() without also including '
'it in annotate() is not allowed: %s' % item
)
if errors:
raise FieldError('Invalid order_by arguments: %s' % errors)
if ordering:
self.order_by += ordering
else:
self.default_ordering = False
def clear_ordering(self, force_empty):
"""
Remove any ordering settings. If 'force_empty' is True, there will be
no ordering in the resulting query (not even the model's default).
"""
self.order_by = ()
self.extra_order_by = ()
if force_empty:
self.default_ordering = False
def set_group_by(self, allow_aliases=True):
"""
Expand the GROUP BY clause required by the query.
This will usually be the set of all non-aggregate fields in the
return data. If the database backend supports grouping by the
primary key, and the query would be equivalent, the optimization
will be made automatically.
"""
group_by = list(self.select)
if self.annotation_select:
for alias, annotation in self.annotation_select.items():
signature = inspect.signature(annotation.get_group_by_cols)
if 'alias' not in signature.parameters:
annotation_class = annotation.__class__
msg = (
'`alias=None` must be added to the signature of '
'%s.%s.get_group_by_cols().'
) % (annotation_class.__module__, annotation_class.__qualname__)
warnings.warn(msg, category=RemovedInDjango40Warning)
group_by_cols = annotation.get_group_by_cols()
else:
if not allow_aliases:
alias = None
group_by_cols = annotation.get_group_by_cols(alias=alias)
group_by.extend(group_by_cols)
self.group_by = tuple(group_by)
def add_select_related(self, fields):
"""
Set up the select_related data structure so that we only select
certain related models (as opposed to all models, when
self.select_related=True).
"""
if isinstance(self.select_related, bool):
field_dict = {}
else:
field_dict = self.select_related
for field in fields:
d = field_dict
for part in field.split(LOOKUP_SEP):
d = d.setdefault(part, {})
self.select_related = field_dict
def add_extra(self, select, select_params, where, params, tables, order_by):
"""
Add data to the various extra_* attributes for user-created additions
to the query.
"""
if select:
# We need to pair any placeholder markers in the 'select'
# dictionary with their parameters in 'select_params' so that
# subsequent updates to the select dictionary also adjust the
# parameters appropriately.
select_pairs = {}
if select_params:
param_iter = iter(select_params)
else:
param_iter = iter([])
for name, entry in select.items():
entry = str(entry)
entry_params = []
pos = entry.find("%s")
while pos != -1:
if pos == 0 or entry[pos - 1] != '%':
entry_params.append(next(param_iter))
pos = entry.find("%s", pos + 2)
select_pairs[name] = (entry, entry_params)
self.extra.update(select_pairs)
if where or params:
self.where.add(ExtraWhere(where, params), AND)
if tables:
self.extra_tables += tuple(tables)
if order_by:
self.extra_order_by = order_by
def clear_deferred_loading(self):
"""Remove any fields from the deferred loading set."""
self.deferred_loading = (frozenset(), True)
def add_deferred_loading(self, field_names):
"""
Add the given list of model field names to the set of fields to
exclude from loading from the database when automatic column selection
is done. Add the new field names to any existing field names that
are deferred (or removed from any existing field names that are marked
as the only ones for immediate loading).
"""
# Fields on related models are stored in the literal double-underscore
# format, so that we can use a set datastructure. We do the foo__bar
# splitting and handling when computing the SQL column names (as part of
# get_columns()).
existing, defer = self.deferred_loading
if defer:
# Add to existing deferred names.
self.deferred_loading = existing.union(field_names), True
else:
# Remove names from the set of any existing "immediate load" names.
self.deferred_loading = existing.difference(field_names), False
def add_immediate_loading(self, field_names):
"""
Add the given list of model field names to the set of fields to
retrieve when the SQL is executed ("immediate loading" fields). The
field names replace any existing immediate loading field names. If
there are field names already specified for deferred loading, remove
those names from the new field_names before storing the new names
for immediate loading. (That is, immediate loading overrides any
existing immediate values, but respects existing deferrals.)
"""
existing, defer = self.deferred_loading
field_names = set(field_names)
if 'pk' in field_names:
field_names.remove('pk')
field_names.add(self.get_meta().pk.name)
if defer:
# Remove any existing deferred names from the current set before
# setting the new names.
self.deferred_loading = field_names.difference(existing), False
else:
# Replace any existing "immediate load" field names.
self.deferred_loading = frozenset(field_names), False
def get_loaded_field_names(self):
"""
If any fields are marked to be deferred, return a dictionary mapping
models to a set of names in those fields that will be loaded. If a
model is not in the returned dictionary, none of its fields are
deferred.
If no fields are marked for deferral, return an empty dictionary.
"""
# We cache this because we call this function multiple times
# (compiler.fill_related_selections, query.iterator)
try:
return self._loaded_field_names_cache
except AttributeError:
collection = {}
self.deferred_to_data(collection, self.get_loaded_field_names_cb)
self._loaded_field_names_cache = collection
return collection
def get_loaded_field_names_cb(self, target, model, fields):
"""Callback used by get_deferred_field_names()."""
target[model] = {f.attname for f in fields}
def set_annotation_mask(self, names):
"""Set the mask of annotations that will be returned by the SELECT."""
if names is None:
self.annotation_select_mask = None
else:
self.annotation_select_mask = set(names)
self._annotation_select_cache = None
def append_annotation_mask(self, names):
if self.annotation_select_mask is not None:
self.set_annotation_mask(self.annotation_select_mask.union(names))
def set_extra_mask(self, names):
"""
Set the mask of extra select items that will be returned by SELECT.
Don't remove them from the Query since they might be used later.
"""
if names is None:
self.extra_select_mask = None
else:
self.extra_select_mask = set(names)
self._extra_select_cache = None
def set_values(self, fields):
self.select_related = False
self.clear_deferred_loading()
self.clear_select_fields()
if fields:
field_names = []
extra_names = []
annotation_names = []
if not self.extra and not self.annotations:
# Shortcut - if there are no extra or annotations, then
# the values() clause must be just field names.
field_names = list(fields)
else:
self.default_cols = False
for f in fields:
if f in self.extra_select:
extra_names.append(f)
elif f in self.annotation_select:
annotation_names.append(f)
else:
field_names.append(f)
self.set_extra_mask(extra_names)
self.set_annotation_mask(annotation_names)
else:
field_names = [f.attname for f in self.model._meta.concrete_fields]
# Selected annotations must be known before setting the GROUP BY
# clause.
if self.group_by is True:
self.add_fields((f.attname for f in self.model._meta.concrete_fields), False)
# Disable GROUP BY aliases to avoid orphaning references to the
# SELECT clause which is about to be cleared.
self.set_group_by(allow_aliases=False)
self.clear_select_fields()
self.values_select = tuple(field_names)
self.add_fields(field_names, True)
@property
def annotation_select(self):
"""
Return the dictionary of aggregate columns that are not masked and
should be used in the SELECT clause. Cache this result for performance.
"""
if self._annotation_select_cache is not None:
return self._annotation_select_cache
elif not self.annotations:
return {}
elif self.annotation_select_mask is not None:
self._annotation_select_cache = {
k: v for k, v in self.annotations.items()
if k in self.annotation_select_mask
}
return self._annotation_select_cache
else:
return self.annotations
@property
def extra_select(self):
if self._extra_select_cache is not None:
return self._extra_select_cache
if not self.extra:
return {}
elif self.extra_select_mask is not None:
self._extra_select_cache = {
k: v for k, v in self.extra.items()
if k in self.extra_select_mask
}
return self._extra_select_cache
else:
return self.extra
def trim_start(self, names_with_path):
"""
Trim joins from the start of the join path. The candidates for trim
are the PathInfos in names_with_path structure that are m2m joins.
Also set the select column so the start matches the join.
This method is meant to be used for generating the subquery joins &
cols in split_exclude().
Return a lookup usable for doing outerq.filter(lookup=self) and a
boolean indicating if the joins in the prefix contain a LEFT OUTER join.
_"""
all_paths = []
for _, paths in names_with_path:
all_paths.extend(paths)
contains_louter = False
# Trim and operate only on tables that were generated for
# the lookup part of the query. That is, avoid trimming
# joins generated for F() expressions.
lookup_tables = [
t for t in self.alias_map
if t in self._lookup_joins or t == self.base_table
]
for trimmed_paths, path in enumerate(all_paths):
if path.m2m:
break
if self.alias_map[lookup_tables[trimmed_paths + 1]].join_type == LOUTER:
contains_louter = True
alias = lookup_tables[trimmed_paths]
self.unref_alias(alias)
# The path.join_field is a Rel, lets get the other side's field
join_field = path.join_field.field
# Build the filter prefix.
paths_in_prefix = trimmed_paths
trimmed_prefix = []
for name, path in names_with_path:
if paths_in_prefix - len(path) < 0:
break
trimmed_prefix.append(name)
paths_in_prefix -= len(path)
trimmed_prefix.append(
join_field.foreign_related_fields[0].name)
trimmed_prefix = LOOKUP_SEP.join(trimmed_prefix)
# Lets still see if we can trim the first join from the inner query
# (that is, self). We can't do this for:
# - LEFT JOINs because we would miss those rows that have nothing on
# the outer side,
# - INNER JOINs from filtered relations because we would miss their
# filters.
first_join = self.alias_map[lookup_tables[trimmed_paths + 1]]
if first_join.join_type != LOUTER and not first_join.filtered_relation:
select_fields = [r[0] for r in join_field.related_fields]
select_alias = lookup_tables[trimmed_paths + 1]
self.unref_alias(lookup_tables[trimmed_paths])
extra_restriction = join_field.get_extra_restriction(
self.where_class, None, lookup_tables[trimmed_paths + 1])
if extra_restriction:
self.where.add(extra_restriction, AND)
else:
# TODO: It might be possible to trim more joins from the start of the
# inner query if it happens to have a longer join chain containing the
# values in select_fields. Lets punt this one for now.
select_fields = [r[1] for r in join_field.related_fields]
select_alias = lookup_tables[trimmed_paths]
# The found starting point is likely a Join instead of a BaseTable reference.
# But the first entry in the query's FROM clause must not be a JOIN.
for table in self.alias_map:
if self.alias_refcount[table] > 0:
self.alias_map[table] = BaseTable(self.alias_map[table].table_name, table)
break
self.set_select([f.get_col(select_alias) for f in select_fields])
return trimmed_prefix, contains_louter
def is_nullable(self, field):
"""
Check if the given field should be treated as nullable.
Some backends treat '' as null and Django treats such fields as
nullable for those backends. In such situations field.null can be
False even if we should treat the field as nullable.
"""
# We need to use DEFAULT_DB_ALIAS here, as QuerySet does not have
# (nor should it have) knowledge of which connection is going to be
# used. The proper fix would be to defer all decisions where
# is_nullable() is needed to the compiler stage, but that is not easy
# to do currently.
return (
connections[DEFAULT_DB_ALIAS].features.interprets_empty_strings_as_nulls and
field.empty_strings_allowed
) or field.null
def get_order_dir(field, default='ASC'):
"""
Return the field name and direction for an order specification. For
example, '-foo' is returned as ('foo', 'DESC').
The 'default' param is used to indicate which way no prefix (or a '+'
prefix) should sort. The '-' prefix always sorts the opposite way.
"""
dirn = ORDER_DIR[default]
if field[0] == '-':
return field[1:], dirn[1]
return field, dirn[0]
def add_to_dict(data, key, value):
"""
Add "value" to the set of values for "key", whether or not "key" already
exists.
"""
if key in data:
data[key].add(value)
else:
data[key] = {value}
def is_reverse_o2o(field):
"""
Check if the given field is reverse-o2o. The field is expected to be some
sort of relation field or related object.
"""
return field.is_relation and field.one_to_one and not field.concrete
class JoinPromoter:
"""
A class to abstract away join promotion problems for complex filter
conditions.
"""
def __init__(self, connector, num_children, negated):
self.connector = connector
self.negated = negated
if self.negated:
if connector == AND:
self.effective_connector = OR
else:
self.effective_connector = AND
else:
self.effective_connector = self.connector
self.num_children = num_children
# Maps of table alias to how many times it is seen as required for
# inner and/or outer joins.
self.votes = Counter()
def add_votes(self, votes):
"""
Add single vote per item to self.votes. Parameter can be any
iterable.
"""
self.votes.update(votes)
def update_join_types(self, query):
"""
Change join types so that the generated query is as efficient as
possible, but still correct. So, change as many joins as possible
to INNER, but don't make OUTER joins INNER if that could remove
results from the query.
"""
to_promote = set()
to_demote = set()
# The effective_connector is used so that NOT (a AND b) is treated
# similarly to (a OR b) for join promotion.
for table, votes in self.votes.items():
# We must use outer joins in OR case when the join isn't contained
# in all of the joins. Otherwise the INNER JOIN itself could remove
# valid results. Consider the case where a model with rel_a and
# rel_b relations is queried with rel_a__col=1 | rel_b__col=2. Now,
# if rel_a join doesn't produce any results is null (for example
# reverse foreign key or null value in direct foreign key), and
# there is a matching row in rel_b with col=2, then an INNER join
# to rel_a would remove a valid match from the query. So, we need
# to promote any existing INNER to LOUTER (it is possible this
# promotion in turn will be demoted later on).
if self.effective_connector == 'OR' and votes < self.num_children:
to_promote.add(table)
# If connector is AND and there is a filter that can match only
# when there is a joinable row, then use INNER. For example, in
# rel_a__col=1 & rel_b__col=2, if either of the rels produce NULL
# as join output, then the col=1 or col=2 can't match (as
# NULL=anything is always false).
# For the OR case, if all children voted for a join to be inner,
# then we can use INNER for the join. For example:
# (rel_a__col__icontains=Alex | rel_a__col__icontains=Russell)
# then if rel_a doesn't produce any rows, the whole condition
# can't match. Hence we can safely use INNER join.
if self.effective_connector == 'AND' or (
self.effective_connector == 'OR' and votes == self.num_children):
to_demote.add(table)
# Finally, what happens in cases where we have:
# (rel_a__col=1|rel_b__col=2) & rel_a__col__gte=0
# Now, we first generate the OR clause, and promote joins for it
# in the first if branch above. Both rel_a and rel_b are promoted
# to LOUTER joins. After that we do the AND case. The OR case
# voted no inner joins but the rel_a__col__gte=0 votes inner join
# for rel_a. We demote it back to INNER join (in AND case a single
# vote is enough). The demotion is OK, if rel_a doesn't produce
# rows, then the rel_a__col__gte=0 clause can't be true, and thus
# the whole clause must be false. So, it is safe to use INNER
# join.
# Note that in this example we could just as well have the __gte
# clause and the OR clause swapped. Or we could replace the __gte
# clause with an OR clause containing rel_a__col=1|rel_a__col=2,
# and again we could safely demote to INNER.
query.promote_joins(to_promote)
query.demote_joins(to_demote)
return to_demote
|
fc12a0f430e732180bc48fb1cdc935c9e954d417652ec6c51eb8937482010b43 | import datetime
import re
from decimal import Decimal
from django.core.exceptions import FieldError
from django.db import connection
from django.db.models import (
Avg, Count, DecimalField, DurationField, F, FloatField, Func, IntegerField,
Max, Min, Sum, Value,
)
from django.db.models.expressions import Case, Exists, OuterRef, Subquery, When
from django.test import TestCase
from django.test.testcases import skipUnlessDBFeature
from django.test.utils import Approximate, CaptureQueriesContext
from django.utils import timezone
from .models import Author, Book, Publisher, Store
class AggregateTestCase(TestCase):
@classmethod
def setUpTestData(cls):
cls.a1 = Author.objects.create(name='Adrian Holovaty', age=34)
cls.a2 = Author.objects.create(name='Jacob Kaplan-Moss', age=35)
cls.a3 = Author.objects.create(name='Brad Dayley', age=45)
cls.a4 = Author.objects.create(name='James Bennett', age=29)
cls.a5 = Author.objects.create(name='Jeffrey Forcier', age=37)
cls.a6 = Author.objects.create(name='Paul Bissex', age=29)
cls.a7 = Author.objects.create(name='Wesley J. Chun', age=25)
cls.a8 = Author.objects.create(name='Peter Norvig', age=57)
cls.a9 = Author.objects.create(name='Stuart Russell', age=46)
cls.a1.friends.add(cls.a2, cls.a4)
cls.a2.friends.add(cls.a1, cls.a7)
cls.a4.friends.add(cls.a1)
cls.a5.friends.add(cls.a6, cls.a7)
cls.a6.friends.add(cls.a5, cls.a7)
cls.a7.friends.add(cls.a2, cls.a5, cls.a6)
cls.a8.friends.add(cls.a9)
cls.a9.friends.add(cls.a8)
cls.p1 = Publisher.objects.create(name='Apress', num_awards=3, duration=datetime.timedelta(days=1))
cls.p2 = Publisher.objects.create(name='Sams', num_awards=1, duration=datetime.timedelta(days=2))
cls.p3 = Publisher.objects.create(name='Prentice Hall', num_awards=7)
cls.p4 = Publisher.objects.create(name='Morgan Kaufmann', num_awards=9)
cls.p5 = Publisher.objects.create(name="Jonno's House of Books", num_awards=0)
cls.b1 = Book.objects.create(
isbn='159059725', name='The Definitive Guide to Django: Web Development Done Right',
pages=447, rating=4.5, price=Decimal('30.00'), contact=cls.a1, publisher=cls.p1,
pubdate=datetime.date(2007, 12, 6)
)
cls.b2 = Book.objects.create(
isbn='067232959', name='Sams Teach Yourself Django in 24 Hours',
pages=528, rating=3.0, price=Decimal('23.09'), contact=cls.a3, publisher=cls.p2,
pubdate=datetime.date(2008, 3, 3)
)
cls.b3 = Book.objects.create(
isbn='159059996', name='Practical Django Projects',
pages=300, rating=4.0, price=Decimal('29.69'), contact=cls.a4, publisher=cls.p1,
pubdate=datetime.date(2008, 6, 23)
)
cls.b4 = Book.objects.create(
isbn='013235613', name='Python Web Development with Django',
pages=350, rating=4.0, price=Decimal('29.69'), contact=cls.a5, publisher=cls.p3,
pubdate=datetime.date(2008, 11, 3)
)
cls.b5 = Book.objects.create(
isbn='013790395', name='Artificial Intelligence: A Modern Approach',
pages=1132, rating=4.0, price=Decimal('82.80'), contact=cls.a8, publisher=cls.p3,
pubdate=datetime.date(1995, 1, 15)
)
cls.b6 = Book.objects.create(
isbn='155860191', name='Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp',
pages=946, rating=5.0, price=Decimal('75.00'), contact=cls.a8, publisher=cls.p4,
pubdate=datetime.date(1991, 10, 15)
)
cls.b1.authors.add(cls.a1, cls.a2)
cls.b2.authors.add(cls.a3)
cls.b3.authors.add(cls.a4)
cls.b4.authors.add(cls.a5, cls.a6, cls.a7)
cls.b5.authors.add(cls.a8, cls.a9)
cls.b6.authors.add(cls.a8)
s1 = Store.objects.create(
name='Amazon.com',
original_opening=datetime.datetime(1994, 4, 23, 9, 17, 42),
friday_night_closing=datetime.time(23, 59, 59)
)
s2 = Store.objects.create(
name='Books.com',
original_opening=datetime.datetime(2001, 3, 15, 11, 23, 37),
friday_night_closing=datetime.time(23, 59, 59)
)
s3 = Store.objects.create(
name="Mamma and Pappa's Books",
original_opening=datetime.datetime(1945, 4, 25, 16, 24, 14),
friday_night_closing=datetime.time(21, 30)
)
s1.books.add(cls.b1, cls.b2, cls.b3, cls.b4, cls.b5, cls.b6)
s2.books.add(cls.b1, cls.b3, cls.b5, cls.b6)
s3.books.add(cls.b3, cls.b4, cls.b6)
def test_empty_aggregate(self):
self.assertEqual(Author.objects.all().aggregate(), {})
def test_aggregate_in_order_by(self):
msg = (
'Using an aggregate in order_by() without also including it in '
'annotate() is not allowed: Avg(F(book__rating)'
)
with self.assertRaisesMessage(FieldError, msg):
Author.objects.values('age').order_by(Avg('book__rating'))
def test_single_aggregate(self):
vals = Author.objects.aggregate(Avg("age"))
self.assertEqual(vals, {"age__avg": Approximate(37.4, places=1)})
def test_multiple_aggregates(self):
vals = Author.objects.aggregate(Sum("age"), Avg("age"))
self.assertEqual(vals, {"age__sum": 337, "age__avg": Approximate(37.4, places=1)})
def test_filter_aggregate(self):
vals = Author.objects.filter(age__gt=29).aggregate(Sum("age"))
self.assertEqual(vals, {'age__sum': 254})
def test_related_aggregate(self):
vals = Author.objects.aggregate(Avg("friends__age"))
self.assertEqual(vals, {'friends__age__avg': Approximate(34.07, places=2)})
vals = Book.objects.filter(rating__lt=4.5).aggregate(Avg("authors__age"))
self.assertEqual(vals, {'authors__age__avg': Approximate(38.2857, places=2)})
vals = Author.objects.all().filter(name__contains="a").aggregate(Avg("book__rating"))
self.assertEqual(vals, {'book__rating__avg': 4.0})
vals = Book.objects.aggregate(Sum("publisher__num_awards"))
self.assertEqual(vals, {'publisher__num_awards__sum': 30})
vals = Publisher.objects.aggregate(Sum("book__price"))
self.assertEqual(vals, {'book__price__sum': Decimal('270.27')})
def test_aggregate_multi_join(self):
vals = Store.objects.aggregate(Max("books__authors__age"))
self.assertEqual(vals, {'books__authors__age__max': 57})
vals = Author.objects.aggregate(Min("book__publisher__num_awards"))
self.assertEqual(vals, {'book__publisher__num_awards__min': 1})
def test_aggregate_alias(self):
vals = Store.objects.filter(name="Amazon.com").aggregate(amazon_mean=Avg("books__rating"))
self.assertEqual(vals, {'amazon_mean': Approximate(4.08, places=2)})
def test_annotate_basic(self):
self.assertQuerysetEqual(
Book.objects.annotate().order_by('pk'), [
"The Definitive Guide to Django: Web Development Done Right",
"Sams Teach Yourself Django in 24 Hours",
"Practical Django Projects",
"Python Web Development with Django",
"Artificial Intelligence: A Modern Approach",
"Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp"
],
lambda b: b.name
)
books = Book.objects.annotate(mean_age=Avg("authors__age"))
b = books.get(pk=self.b1.pk)
self.assertEqual(
b.name,
'The Definitive Guide to Django: Web Development Done Right'
)
self.assertEqual(b.mean_age, 34.5)
def test_annotate_defer(self):
qs = Book.objects.annotate(
page_sum=Sum("pages")).defer('name').filter(pk=self.b1.pk)
rows = [
(self.b1.id, "159059725", 447, "The Definitive Guide to Django: Web Development Done Right")
]
self.assertQuerysetEqual(
qs.order_by('pk'), rows,
lambda r: (r.id, r.isbn, r.page_sum, r.name)
)
def test_annotate_defer_select_related(self):
qs = Book.objects.select_related('contact').annotate(
page_sum=Sum("pages")).defer('name').filter(pk=self.b1.pk)
rows = [
(self.b1.id, "159059725", 447, "Adrian Holovaty",
"The Definitive Guide to Django: Web Development Done Right")
]
self.assertQuerysetEqual(
qs.order_by('pk'), rows,
lambda r: (r.id, r.isbn, r.page_sum, r.contact.name, r.name)
)
def test_annotate_m2m(self):
books = Book.objects.filter(rating__lt=4.5).annotate(Avg("authors__age")).order_by("name")
self.assertQuerysetEqual(
books, [
('Artificial Intelligence: A Modern Approach', 51.5),
('Practical Django Projects', 29.0),
('Python Web Development with Django', Approximate(30.3, places=1)),
('Sams Teach Yourself Django in 24 Hours', 45.0)
],
lambda b: (b.name, b.authors__age__avg),
)
books = Book.objects.annotate(num_authors=Count("authors")).order_by("name")
self.assertQuerysetEqual(
books, [
('Artificial Intelligence: A Modern Approach', 2),
('Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', 1),
('Practical Django Projects', 1),
('Python Web Development with Django', 3),
('Sams Teach Yourself Django in 24 Hours', 1),
('The Definitive Guide to Django: Web Development Done Right', 2)
],
lambda b: (b.name, b.num_authors)
)
def test_backwards_m2m_annotate(self):
authors = Author.objects.filter(name__contains="a").annotate(Avg("book__rating")).order_by("name")
self.assertQuerysetEqual(
authors, [
('Adrian Holovaty', 4.5),
('Brad Dayley', 3.0),
('Jacob Kaplan-Moss', 4.5),
('James Bennett', 4.0),
('Paul Bissex', 4.0),
('Stuart Russell', 4.0)
],
lambda a: (a.name, a.book__rating__avg)
)
authors = Author.objects.annotate(num_books=Count("book")).order_by("name")
self.assertQuerysetEqual(
authors, [
('Adrian Holovaty', 1),
('Brad Dayley', 1),
('Jacob Kaplan-Moss', 1),
('James Bennett', 1),
('Jeffrey Forcier', 1),
('Paul Bissex', 1),
('Peter Norvig', 2),
('Stuart Russell', 1),
('Wesley J. Chun', 1)
],
lambda a: (a.name, a.num_books)
)
def test_reverse_fkey_annotate(self):
books = Book.objects.annotate(Sum("publisher__num_awards")).order_by("name")
self.assertQuerysetEqual(
books, [
('Artificial Intelligence: A Modern Approach', 7),
('Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', 9),
('Practical Django Projects', 3),
('Python Web Development with Django', 7),
('Sams Teach Yourself Django in 24 Hours', 1),
('The Definitive Guide to Django: Web Development Done Right', 3)
],
lambda b: (b.name, b.publisher__num_awards__sum)
)
publishers = Publisher.objects.annotate(Sum("book__price")).order_by("name")
self.assertQuerysetEqual(
publishers, [
('Apress', Decimal("59.69")),
("Jonno's House of Books", None),
('Morgan Kaufmann', Decimal("75.00")),
('Prentice Hall', Decimal("112.49")),
('Sams', Decimal("23.09"))
],
lambda p: (p.name, p.book__price__sum)
)
def test_annotate_values(self):
books = list(Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values())
self.assertEqual(
books, [
{
"contact_id": self.a1.id,
"id": self.b1.id,
"isbn": "159059725",
"mean_age": 34.5,
"name": "The Definitive Guide to Django: Web Development Done Right",
"pages": 447,
"price": Approximate(Decimal("30")),
"pubdate": datetime.date(2007, 12, 6),
"publisher_id": self.p1.id,
"rating": 4.5,
}
]
)
books = (
Book.objects
.filter(pk=self.b1.pk)
.annotate(mean_age=Avg('authors__age'))
.values('pk', 'isbn', 'mean_age')
)
self.assertEqual(
list(books), [
{
"pk": self.b1.pk,
"isbn": "159059725",
"mean_age": 34.5,
}
]
)
books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values("name")
self.assertEqual(
list(books),
[{'name': 'The Definitive Guide to Django: Web Development Done Right'}],
)
books = Book.objects.filter(pk=self.b1.pk).values().annotate(mean_age=Avg('authors__age'))
self.assertEqual(
list(books), [
{
"contact_id": self.a1.id,
"id": self.b1.id,
"isbn": "159059725",
"mean_age": 34.5,
"name": "The Definitive Guide to Django: Web Development Done Right",
"pages": 447,
"price": Approximate(Decimal("30")),
"pubdate": datetime.date(2007, 12, 6),
"publisher_id": self.p1.id,
"rating": 4.5,
}
]
)
books = (
Book.objects
.values("rating")
.annotate(n_authors=Count("authors__id"), mean_age=Avg("authors__age"))
.order_by("rating")
)
self.assertEqual(
list(books), [
{
"rating": 3.0,
"n_authors": 1,
"mean_age": 45.0,
},
{
"rating": 4.0,
"n_authors": 6,
"mean_age": Approximate(37.16, places=1)
},
{
"rating": 4.5,
"n_authors": 2,
"mean_age": 34.5,
},
{
"rating": 5.0,
"n_authors": 1,
"mean_age": 57.0,
}
]
)
authors = Author.objects.annotate(Avg("friends__age")).order_by("name")
self.assertQuerysetEqual(
authors, [
('Adrian Holovaty', 32.0),
('Brad Dayley', None),
('Jacob Kaplan-Moss', 29.5),
('James Bennett', 34.0),
('Jeffrey Forcier', 27.0),
('Paul Bissex', 31.0),
('Peter Norvig', 46.0),
('Stuart Russell', 57.0),
('Wesley J. Chun', Approximate(33.66, places=1))
],
lambda a: (a.name, a.friends__age__avg)
)
def test_count(self):
vals = Book.objects.aggregate(Count("rating"))
self.assertEqual(vals, {"rating__count": 6})
def test_count_star(self):
with self.assertNumQueries(1) as ctx:
Book.objects.aggregate(n=Count("*"))
sql = ctx.captured_queries[0]['sql']
self.assertIn('SELECT COUNT(*) ', sql)
def test_count_distinct_expression(self):
aggs = Book.objects.aggregate(
distinct_ratings=Count(Case(When(pages__gt=300, then='rating')), distinct=True),
)
self.assertEqual(aggs['distinct_ratings'], 4)
def test_distinct_on_aggregate(self):
for aggregate, expected_result in (
(Avg, 4.125),
(Count, 4),
(Sum, 16.5),
):
with self.subTest(aggregate=aggregate.__name__):
books = Book.objects.aggregate(ratings=aggregate('rating', distinct=True))
self.assertEqual(books['ratings'], expected_result)
def test_non_grouped_annotation_not_in_group_by(self):
"""
An annotation not included in values() before an aggregate should be
excluded from the group by clause.
"""
qs = (
Book.objects.annotate(xprice=F('price')).filter(rating=4.0).values('rating')
.annotate(count=Count('publisher_id', distinct=True)).values('count', 'rating').order_by('count')
)
self.assertEqual(list(qs), [{'rating': 4.0, 'count': 2}])
def test_grouped_annotation_in_group_by(self):
"""
An annotation included in values() before an aggregate should be
included in the group by clause.
"""
qs = (
Book.objects.annotate(xprice=F('price')).filter(rating=4.0).values('rating', 'xprice')
.annotate(count=Count('publisher_id', distinct=True)).values('count', 'rating').order_by('count')
)
self.assertEqual(
list(qs), [
{'rating': 4.0, 'count': 1},
{'rating': 4.0, 'count': 2},
]
)
def test_fkey_aggregate(self):
explicit = list(Author.objects.annotate(Count('book__id')))
implicit = list(Author.objects.annotate(Count('book')))
self.assertCountEqual(explicit, implicit)
def test_annotate_ordering(self):
books = Book.objects.values('rating').annotate(oldest=Max('authors__age')).order_by('oldest', 'rating')
self.assertEqual(
list(books), [
{'rating': 4.5, 'oldest': 35},
{'rating': 3.0, 'oldest': 45},
{'rating': 4.0, 'oldest': 57},
{'rating': 5.0, 'oldest': 57},
]
)
books = Book.objects.values("rating").annotate(oldest=Max("authors__age")).order_by("-oldest", "-rating")
self.assertEqual(
list(books), [
{'rating': 5.0, 'oldest': 57},
{'rating': 4.0, 'oldest': 57},
{'rating': 3.0, 'oldest': 45},
{'rating': 4.5, 'oldest': 35},
]
)
def test_aggregate_annotation(self):
vals = Book.objects.annotate(num_authors=Count("authors__id")).aggregate(Avg("num_authors"))
self.assertEqual(vals, {"num_authors__avg": Approximate(1.66, places=1)})
def test_avg_duration_field(self):
# Explicit `output_field`.
self.assertEqual(
Publisher.objects.aggregate(Avg('duration', output_field=DurationField())),
{'duration__avg': datetime.timedelta(days=1, hours=12)}
)
# Implicit `output_field`.
self.assertEqual(
Publisher.objects.aggregate(Avg('duration')),
{'duration__avg': datetime.timedelta(days=1, hours=12)}
)
def test_sum_duration_field(self):
self.assertEqual(
Publisher.objects.aggregate(Sum('duration', output_field=DurationField())),
{'duration__sum': datetime.timedelta(days=3)}
)
def test_sum_distinct_aggregate(self):
"""
Sum on a distinct() QuerySet should aggregate only the distinct items.
"""
authors = Author.objects.filter(book__in=[self.b5, self.b6])
self.assertEqual(authors.count(), 3)
distinct_authors = authors.distinct()
self.assertEqual(distinct_authors.count(), 2)
# Selected author ages are 57 and 46
age_sum = distinct_authors.aggregate(Sum('age'))
self.assertEqual(age_sum['age__sum'], 103)
def test_filtering(self):
p = Publisher.objects.create(name='Expensive Publisher', num_awards=0)
Book.objects.create(
name='ExpensiveBook1',
pages=1,
isbn='111',
rating=3.5,
price=Decimal("1000"),
publisher=p,
contact_id=self.a1.id,
pubdate=datetime.date(2008, 12, 1)
)
Book.objects.create(
name='ExpensiveBook2',
pages=1,
isbn='222',
rating=4.0,
price=Decimal("1000"),
publisher=p,
contact_id=self.a1.id,
pubdate=datetime.date(2008, 12, 2)
)
Book.objects.create(
name='ExpensiveBook3',
pages=1,
isbn='333',
rating=4.5,
price=Decimal("35"),
publisher=p,
contact_id=self.a1.id,
pubdate=datetime.date(2008, 12, 3)
)
publishers = Publisher.objects.annotate(num_books=Count("book__id")).filter(num_books__gt=1).order_by("pk")
self.assertQuerysetEqual(
publishers,
['Apress', 'Prentice Hall', 'Expensive Publisher'],
lambda p: p.name,
)
publishers = Publisher.objects.filter(book__price__lt=Decimal("40.0")).order_by("pk")
self.assertQuerysetEqual(
publishers, [
"Apress",
"Apress",
"Sams",
"Prentice Hall",
"Expensive Publisher",
],
lambda p: p.name
)
publishers = (
Publisher.objects
.annotate(num_books=Count("book__id"))
.filter(num_books__gt=1, book__price__lt=Decimal("40.0"))
.order_by("pk")
)
self.assertQuerysetEqual(
publishers,
['Apress', 'Prentice Hall', 'Expensive Publisher'],
lambda p: p.name,
)
publishers = (
Publisher.objects
.filter(book__price__lt=Decimal("40.0"))
.annotate(num_books=Count("book__id"))
.filter(num_books__gt=1)
.order_by("pk")
)
self.assertQuerysetEqual(publishers, ['Apress'], lambda p: p.name)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__range=[1, 3]).order_by("pk")
self.assertQuerysetEqual(
publishers, [
"Apress",
"Sams",
"Prentice Hall",
"Morgan Kaufmann",
"Expensive Publisher",
],
lambda p: p.name
)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__range=[1, 2]).order_by("pk")
self.assertQuerysetEqual(
publishers,
['Apress', 'Sams', 'Prentice Hall', 'Morgan Kaufmann'],
lambda p: p.name
)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__in=[1, 3]).order_by("pk")
self.assertQuerysetEqual(
publishers,
['Sams', 'Morgan Kaufmann', 'Expensive Publisher'],
lambda p: p.name,
)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__isnull=True)
self.assertEqual(len(publishers), 0)
def test_annotation(self):
vals = Author.objects.filter(pk=self.a1.pk).aggregate(Count("friends__id"))
self.assertEqual(vals, {"friends__id__count": 2})
books = Book.objects.annotate(num_authors=Count("authors__name")).filter(num_authors__exact=2).order_by("pk")
self.assertQuerysetEqual(
books, [
"The Definitive Guide to Django: Web Development Done Right",
"Artificial Intelligence: A Modern Approach",
],
lambda b: b.name
)
authors = (
Author.objects
.annotate(num_friends=Count("friends__id", distinct=True))
.filter(num_friends=0)
.order_by("pk")
)
self.assertQuerysetEqual(authors, ['Brad Dayley'], lambda a: a.name)
publishers = Publisher.objects.annotate(num_books=Count("book__id")).filter(num_books__gt=1).order_by("pk")
self.assertQuerysetEqual(publishers, ['Apress', 'Prentice Hall'], lambda p: p.name)
publishers = (
Publisher.objects
.filter(book__price__lt=Decimal("40.0"))
.annotate(num_books=Count("book__id"))
.filter(num_books__gt=1)
)
self.assertQuerysetEqual(publishers, ['Apress'], lambda p: p.name)
books = (
Book.objects
.annotate(num_authors=Count("authors__id"))
.filter(authors__name__contains="Norvig", num_authors__gt=1)
)
self.assertQuerysetEqual(
books,
['Artificial Intelligence: A Modern Approach'],
lambda b: b.name
)
def test_more_aggregation(self):
a = Author.objects.get(name__contains='Norvig')
b = Book.objects.get(name__contains='Done Right')
b.authors.add(a)
b.save()
vals = (
Book.objects
.annotate(num_authors=Count("authors__id"))
.filter(authors__name__contains="Norvig", num_authors__gt=1)
.aggregate(Avg("rating"))
)
self.assertEqual(vals, {"rating__avg": 4.25})
def test_even_more_aggregate(self):
publishers = Publisher.objects.annotate(
earliest_book=Min("book__pubdate"),
).exclude(earliest_book=None).order_by("earliest_book").values(
'earliest_book',
'num_awards',
'id',
'name',
)
self.assertEqual(
list(publishers), [
{
'earliest_book': datetime.date(1991, 10, 15),
'num_awards': 9,
'id': self.p4.id,
'name': 'Morgan Kaufmann'
},
{
'earliest_book': datetime.date(1995, 1, 15),
'num_awards': 7,
'id': self.p3.id,
'name': 'Prentice Hall'
},
{
'earliest_book': datetime.date(2007, 12, 6),
'num_awards': 3,
'id': self.p1.id,
'name': 'Apress'
},
{
'earliest_book': datetime.date(2008, 3, 3),
'num_awards': 1,
'id': self.p2.id,
'name': 'Sams'
}
]
)
vals = Store.objects.aggregate(Max("friday_night_closing"), Min("original_opening"))
self.assertEqual(
vals,
{
"friday_night_closing__max": datetime.time(23, 59, 59),
"original_opening__min": datetime.datetime(1945, 4, 25, 16, 24, 14),
}
)
def test_annotate_values_list(self):
books = (
Book.objects
.filter(pk=self.b1.pk)
.annotate(mean_age=Avg("authors__age"))
.values_list("pk", "isbn", "mean_age")
)
self.assertEqual(list(books), [(self.b1.id, '159059725', 34.5)])
books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values_list("isbn")
self.assertEqual(list(books), [('159059725',)])
books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values_list("mean_age")
self.assertEqual(list(books), [(34.5,)])
books = (
Book.objects
.filter(pk=self.b1.pk)
.annotate(mean_age=Avg("authors__age"))
.values_list("mean_age", flat=True)
)
self.assertEqual(list(books), [34.5])
books = Book.objects.values_list("price").annotate(count=Count("price")).order_by("-count", "price")
self.assertEqual(
list(books), [
(Decimal("29.69"), 2),
(Decimal('23.09'), 1),
(Decimal('30'), 1),
(Decimal('75'), 1),
(Decimal('82.8'), 1),
]
)
def test_dates_with_aggregation(self):
"""
.dates() returns a distinct set of dates when applied to a
QuerySet with aggregation.
Refs #18056. Previously, .dates() would return distinct (date_kind,
aggregation) sets, in this case (year, num_authors), so 2008 would be
returned twice because there are books from 2008 with a different
number of authors.
"""
dates = Book.objects.annotate(num_authors=Count("authors")).dates('pubdate', 'year')
self.assertQuerysetEqual(
dates, [
"datetime.date(1991, 1, 1)",
"datetime.date(1995, 1, 1)",
"datetime.date(2007, 1, 1)",
"datetime.date(2008, 1, 1)"
]
)
def test_values_aggregation(self):
# Refs #20782
max_rating = Book.objects.values('rating').aggregate(max_rating=Max('rating'))
self.assertEqual(max_rating['max_rating'], 5)
max_books_per_rating = Book.objects.values('rating').annotate(
books_per_rating=Count('id')
).aggregate(Max('books_per_rating'))
self.assertEqual(
max_books_per_rating,
{'books_per_rating__max': 3})
def test_ticket17424(self):
"""
Doing exclude() on a foreign model after annotate() doesn't crash.
"""
all_books = list(Book.objects.values_list('pk', flat=True).order_by('pk'))
annotated_books = Book.objects.order_by('pk').annotate(one=Count("id"))
# The value doesn't matter, we just need any negative
# constraint on a related model that's a noop.
excluded_books = annotated_books.exclude(publisher__name="__UNLIKELY_VALUE__")
# Try to generate query tree
str(excluded_books.query)
self.assertQuerysetEqual(excluded_books, all_books, lambda x: x.pk)
# Check internal state
self.assertIsNone(annotated_books.query.alias_map["aggregation_book"].join_type)
self.assertIsNone(excluded_books.query.alias_map["aggregation_book"].join_type)
def test_ticket12886(self):
"""
Aggregation over sliced queryset works correctly.
"""
qs = Book.objects.all().order_by('-rating')[0:3]
vals = qs.aggregate(average_top3_rating=Avg('rating'))['average_top3_rating']
self.assertAlmostEqual(vals, 4.5, places=2)
def test_ticket11881(self):
"""
Subqueries do not needlessly contain ORDER BY, SELECT FOR UPDATE or
select_related() stuff.
"""
qs = Book.objects.all().select_for_update().order_by(
'pk').select_related('publisher').annotate(max_pk=Max('pk'))
with CaptureQueriesContext(connection) as captured_queries:
qs.aggregate(avg_pk=Avg('max_pk'))
self.assertEqual(len(captured_queries), 1)
qstr = captured_queries[0]['sql'].lower()
self.assertNotIn('for update', qstr)
forced_ordering = connection.ops.force_no_ordering()
if forced_ordering:
# If the backend needs to force an ordering we make sure it's
# the only "ORDER BY" clause present in the query.
self.assertEqual(
re.findall(r'order by (\w+)', qstr),
[', '.join(f[1][0] for f in forced_ordering).lower()]
)
else:
self.assertNotIn('order by', qstr)
self.assertEqual(qstr.count(' join '), 0)
def test_decimal_max_digits_has_no_effect(self):
Book.objects.all().delete()
a1 = Author.objects.first()
p1 = Publisher.objects.first()
thedate = timezone.now()
for i in range(10):
Book.objects.create(
isbn="abcde{}".format(i), name="none", pages=10, rating=4.0,
price=9999.98, contact=a1, publisher=p1, pubdate=thedate)
book = Book.objects.aggregate(price_sum=Sum('price'))
self.assertEqual(book['price_sum'], Decimal("99999.80"))
def test_nonaggregate_aggregation_throws(self):
with self.assertRaisesMessage(TypeError, 'fail is not an aggregate expression'):
Book.objects.aggregate(fail=F('price'))
def test_nonfield_annotation(self):
book = Book.objects.annotate(val=Max(Value(2, output_field=IntegerField()))).first()
self.assertEqual(book.val, 2)
book = Book.objects.annotate(val=Max(Value(2), output_field=IntegerField())).first()
self.assertEqual(book.val, 2)
book = Book.objects.annotate(val=Max(2, output_field=IntegerField())).first()
self.assertEqual(book.val, 2)
def test_missing_output_field_raises_error(self):
with self.assertRaisesMessage(FieldError, 'Cannot resolve expression type, unknown output_field'):
Book.objects.annotate(val=Max(2)).first()
def test_annotation_expressions(self):
authors = Author.objects.annotate(combined_ages=Sum(F('age') + F('friends__age'))).order_by('name')
authors2 = Author.objects.annotate(combined_ages=Sum('age') + Sum('friends__age')).order_by('name')
for qs in (authors, authors2):
self.assertQuerysetEqual(
qs, [
('Adrian Holovaty', 132),
('Brad Dayley', None),
('Jacob Kaplan-Moss', 129),
('James Bennett', 63),
('Jeffrey Forcier', 128),
('Paul Bissex', 120),
('Peter Norvig', 103),
('Stuart Russell', 103),
('Wesley J. Chun', 176)
],
lambda a: (a.name, a.combined_ages)
)
def test_aggregation_expressions(self):
a1 = Author.objects.aggregate(av_age=Sum('age') / Count('*'))
a2 = Author.objects.aggregate(av_age=Sum('age') / Count('age'))
a3 = Author.objects.aggregate(av_age=Avg('age'))
self.assertEqual(a1, {'av_age': 37})
self.assertEqual(a2, {'av_age': 37})
self.assertEqual(a3, {'av_age': Approximate(37.4, places=1)})
def test_avg_decimal_field(self):
v = Book.objects.filter(rating=4).aggregate(avg_price=(Avg('price')))['avg_price']
self.assertIsInstance(v, Decimal)
self.assertEqual(v, Approximate(Decimal('47.39'), places=2))
def test_order_of_precedence(self):
p1 = Book.objects.filter(rating=4).aggregate(avg_price=(Avg('price') + 2) * 3)
self.assertEqual(p1, {'avg_price': Approximate(Decimal('148.18'), places=2)})
p2 = Book.objects.filter(rating=4).aggregate(avg_price=Avg('price') + 2 * 3)
self.assertEqual(p2, {'avg_price': Approximate(Decimal('53.39'), places=2)})
def test_combine_different_types(self):
msg = (
'Expression contains mixed types: FloatField, IntegerField. '
'You must set output_field.'
)
qs = Book.objects.annotate(sums=Sum('rating') + Sum('pages') + Sum('price'))
with self.assertRaisesMessage(FieldError, msg):
qs.first()
with self.assertRaisesMessage(FieldError, msg):
qs.first()
b1 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'),
output_field=IntegerField())).get(pk=self.b4.pk)
self.assertEqual(b1.sums, 383)
b2 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'),
output_field=FloatField())).get(pk=self.b4.pk)
self.assertEqual(b2.sums, 383.69)
b3 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'),
output_field=DecimalField())).get(pk=self.b4.pk)
self.assertEqual(b3.sums, Approximate(Decimal("383.69"), places=2))
def test_complex_aggregations_require_kwarg(self):
with self.assertRaisesMessage(TypeError, 'Complex annotations require an alias'):
Author.objects.annotate(Sum(F('age') + F('friends__age')))
with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'):
Author.objects.aggregate(Sum('age') / Count('age'))
with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'):
Author.objects.aggregate(Sum(1))
def test_aggregate_over_complex_annotation(self):
qs = Author.objects.annotate(
combined_ages=Sum(F('age') + F('friends__age')))
age = qs.aggregate(max_combined_age=Max('combined_ages'))
self.assertEqual(age['max_combined_age'], 176)
age = qs.aggregate(max_combined_age_doubled=Max('combined_ages') * 2)
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
age = qs.aggregate(
max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'))
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
age = qs.aggregate(
max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'),
sum_combined_age=Sum('combined_ages'))
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
self.assertEqual(age['sum_combined_age'], 954)
age = qs.aggregate(
max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'),
sum_combined_age_doubled=Sum('combined_ages') + Sum('combined_ages'))
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
self.assertEqual(age['sum_combined_age_doubled'], 954 * 2)
def test_values_annotation_with_expression(self):
# ensure the F() is promoted to the group by clause
qs = Author.objects.values('name').annotate(another_age=Sum('age') + F('age'))
a = qs.get(name="Adrian Holovaty")
self.assertEqual(a['another_age'], 68)
qs = qs.annotate(friend_count=Count('friends'))
a = qs.get(name="Adrian Holovaty")
self.assertEqual(a['friend_count'], 2)
qs = qs.annotate(combined_age=Sum('age') + F('friends__age')).filter(
name="Adrian Holovaty").order_by('-combined_age')
self.assertEqual(
list(qs), [
{
"name": 'Adrian Holovaty',
"another_age": 68,
"friend_count": 1,
"combined_age": 69
},
{
"name": 'Adrian Holovaty',
"another_age": 68,
"friend_count": 1,
"combined_age": 63
}
]
)
vals = qs.values('name', 'combined_age')
self.assertEqual(
list(vals), [
{'name': 'Adrian Holovaty', 'combined_age': 69},
{'name': 'Adrian Holovaty', 'combined_age': 63},
]
)
def test_annotate_values_aggregate(self):
alias_age = Author.objects.annotate(
age_alias=F('age')
).values(
'age_alias',
).aggregate(sum_age=Sum('age_alias'))
age = Author.objects.values('age').aggregate(sum_age=Sum('age'))
self.assertEqual(alias_age['sum_age'], age['sum_age'])
def test_annotate_over_annotate(self):
author = Author.objects.annotate(
age_alias=F('age')
).annotate(
sum_age=Sum('age_alias')
).get(name="Adrian Holovaty")
other_author = Author.objects.annotate(
sum_age=Sum('age')
).get(name="Adrian Holovaty")
self.assertEqual(author.sum_age, other_author.sum_age)
def test_annotated_aggregate_over_annotated_aggregate(self):
with self.assertRaisesMessage(FieldError, "Cannot compute Sum('id__max'): 'id__max' is an aggregate"):
Book.objects.annotate(Max('id')).annotate(Sum('id__max'))
class MyMax(Max):
def as_sql(self, compiler, connection):
self.set_source_expressions(self.get_source_expressions()[0:1])
return super().as_sql(compiler, connection)
with self.assertRaisesMessage(FieldError, "Cannot compute Max('id__max'): 'id__max' is an aggregate"):
Book.objects.annotate(Max('id')).annotate(my_max=MyMax('id__max', 'price'))
def test_multi_arg_aggregate(self):
class MyMax(Max):
output_field = DecimalField()
def as_sql(self, compiler, connection):
copy = self.copy()
copy.set_source_expressions(copy.get_source_expressions()[0:1])
return super(MyMax, copy).as_sql(compiler, connection)
with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'):
Book.objects.aggregate(MyMax('pages', 'price'))
with self.assertRaisesMessage(TypeError, 'Complex annotations require an alias'):
Book.objects.annotate(MyMax('pages', 'price'))
Book.objects.aggregate(max_field=MyMax('pages', 'price'))
def test_add_implementation(self):
class MySum(Sum):
pass
# test completely changing how the output is rendered
def lower_case_function_override(self, compiler, connection):
sql, params = compiler.compile(self.source_expressions[0])
substitutions = {'function': self.function.lower(), 'expressions': sql, 'distinct': ''}
substitutions.update(self.extra)
return self.template % substitutions, params
setattr(MySum, 'as_' + connection.vendor, lower_case_function_override)
qs = Book.objects.annotate(
sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField())
)
self.assertEqual(str(qs.query).count('sum('), 1)
b1 = qs.get(pk=self.b4.pk)
self.assertEqual(b1.sums, 383)
# test changing the dict and delegating
def lower_case_function_super(self, compiler, connection):
self.extra['function'] = self.function.lower()
return super(MySum, self).as_sql(compiler, connection)
setattr(MySum, 'as_' + connection.vendor, lower_case_function_super)
qs = Book.objects.annotate(
sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField())
)
self.assertEqual(str(qs.query).count('sum('), 1)
b1 = qs.get(pk=self.b4.pk)
self.assertEqual(b1.sums, 383)
# test overriding all parts of the template
def be_evil(self, compiler, connection):
substitutions = {'function': 'MAX', 'expressions': '2', 'distinct': ''}
substitutions.update(self.extra)
return self.template % substitutions, ()
setattr(MySum, 'as_' + connection.vendor, be_evil)
qs = Book.objects.annotate(
sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField())
)
self.assertEqual(str(qs.query).count('MAX('), 1)
b1 = qs.get(pk=self.b4.pk)
self.assertEqual(b1.sums, 2)
def test_complex_values_aggregation(self):
max_rating = Book.objects.values('rating').aggregate(
double_max_rating=Max('rating') + Max('rating'))
self.assertEqual(max_rating['double_max_rating'], 5 * 2)
max_books_per_rating = Book.objects.values('rating').annotate(
books_per_rating=Count('id') + 5
).aggregate(Max('books_per_rating'))
self.assertEqual(
max_books_per_rating,
{'books_per_rating__max': 3 + 5})
def test_expression_on_aggregation(self):
# Create a plain expression
class Greatest(Func):
function = 'GREATEST'
def as_sqlite(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, function='MAX', **extra_context)
qs = Publisher.objects.annotate(
price_or_median=Greatest(Avg('book__rating', output_field=DecimalField()), Avg('book__price'))
).filter(price_or_median__gte=F('num_awards')).order_by('num_awards')
self.assertQuerysetEqual(
qs, [1, 3, 7, 9], lambda v: v.num_awards)
qs2 = Publisher.objects.annotate(
rating_or_num_awards=Greatest(Avg('book__rating'), F('num_awards'),
output_field=FloatField())
).filter(rating_or_num_awards__gt=F('num_awards')).order_by('num_awards')
self.assertQuerysetEqual(
qs2, [1, 3], lambda v: v.num_awards)
def test_arguments_must_be_expressions(self):
msg = 'QuerySet.aggregate() received non-expression(s): %s.'
with self.assertRaisesMessage(TypeError, msg % FloatField()):
Book.objects.aggregate(FloatField())
with self.assertRaisesMessage(TypeError, msg % True):
Book.objects.aggregate(is_book=True)
with self.assertRaisesMessage(TypeError, msg % ', '.join([str(FloatField()), 'True'])):
Book.objects.aggregate(FloatField(), Avg('price'), is_book=True)
def test_aggregation_subquery_annotation(self):
"""Subquery annotations are excluded from the GROUP BY if they are
not explicitly grouped against."""
latest_book_pubdate_qs = Book.objects.filter(
publisher=OuterRef('pk')
).order_by('-pubdate').values('pubdate')[:1]
publisher_qs = Publisher.objects.annotate(
latest_book_pubdate=Subquery(latest_book_pubdate_qs),
).annotate(count=Count('book'))
with self.assertNumQueries(1) as ctx:
list(publisher_qs)
self.assertEqual(ctx[0]['sql'].count('SELECT'), 2)
# The GROUP BY should not be by alias either.
self.assertEqual(ctx[0]['sql'].lower().count('latest_book_pubdate'), 1)
def test_aggregation_subquery_annotation_exists(self):
latest_book_pubdate_qs = Book.objects.filter(
publisher=OuterRef('pk')
).order_by('-pubdate').values('pubdate')[:1]
publisher_qs = Publisher.objects.annotate(
latest_book_pubdate=Subquery(latest_book_pubdate_qs),
count=Count('book'),
)
self.assertTrue(publisher_qs.exists())
def test_aggregation_exists_annotation(self):
published_books = Book.objects.filter(publisher=OuterRef('pk'))
publisher_qs = Publisher.objects.annotate(
published_book=Exists(published_books),
count=Count('book'),
).values_list('name', flat=True)
self.assertCountEqual(list(publisher_qs), [
'Apress',
'Morgan Kaufmann',
"Jonno's House of Books",
'Prentice Hall',
'Sams',
])
def test_aggregation_subquery_annotation_values(self):
"""
Subquery annotations and external aliases are excluded from the GROUP
BY if they are not selected.
"""
books_qs = Book.objects.annotate(
first_author_the_same_age=Subquery(
Author.objects.filter(
age=OuterRef('contact__friends__age'),
).order_by('age').values('id')[:1],
)
).filter(
publisher=self.p1,
first_author_the_same_age__isnull=False,
).annotate(
min_age=Min('contact__friends__age'),
).values('name', 'min_age').order_by('name')
self.assertEqual(list(books_qs), [
{'name': 'Practical Django Projects', 'min_age': 34},
{
'name': 'The Definitive Guide to Django: Web Development Done Right',
'min_age': 29,
},
])
@skipUnlessDBFeature('supports_subqueries_in_group_by')
def test_group_by_subquery_annotation(self):
"""
Subquery annotations are included in the GROUP BY if they are
grouped against.
"""
long_books_count_qs = Book.objects.filter(
publisher=OuterRef('pk'),
pages__gt=400,
).values(
'publisher'
).annotate(count=Count('pk')).values('count')
long_books_count_breakdown = Publisher.objects.values_list(
Subquery(long_books_count_qs, IntegerField()),
).annotate(total=Count('*'))
self.assertEqual(dict(long_books_count_breakdown), {None: 1, 1: 4})
@skipUnlessDBFeature('supports_subqueries_in_group_by')
def test_group_by_exists_annotation(self):
"""
Exists annotations are included in the GROUP BY if they are
grouped against.
"""
long_books_qs = Book.objects.filter(
publisher=OuterRef('pk'),
pages__gt=800,
)
has_long_books_breakdown = Publisher.objects.values_list(
Exists(long_books_qs),
).annotate(total=Count('*'))
self.assertEqual(dict(has_long_books_breakdown), {True: 2, False: 3})
def test_aggregation_subquery_annotation_related_field(self):
publisher = Publisher.objects.create(name=self.a9.name, num_awards=2)
book = Book.objects.create(
isbn='159059999', name='Test book.', pages=819, rating=2.5,
price=Decimal('14.44'), contact=self.a9, publisher=publisher,
pubdate=datetime.date(2019, 12, 6),
)
book.authors.add(self.a5, self.a6, self.a7)
books_qs = Book.objects.annotate(
contact_publisher=Subquery(
Publisher.objects.filter(
pk=OuterRef('publisher'),
name=OuterRef('contact__name'),
).values('name')[:1],
)
).filter(
contact_publisher__isnull=False,
).annotate(count=Count('authors'))
self.assertSequenceEqual(books_qs, [book])
|
e57243382de226d654774a4e6d509d2859bb2bc6b8ae0e1a2eba446ddcc4f258 | import hashlib
import unittest
from django.utils.crypto import constant_time_compare, pbkdf2, salted_hmac
class TestUtilsCryptoMisc(unittest.TestCase):
def test_constant_time_compare(self):
# It's hard to test for constant time, just test the result.
self.assertTrue(constant_time_compare(b'spam', b'spam'))
self.assertFalse(constant_time_compare(b'spam', b'eggs'))
self.assertTrue(constant_time_compare('spam', 'spam'))
self.assertFalse(constant_time_compare('spam', 'eggs'))
def test_salted_hmac(self):
tests = [
((b'salt', b'value'), {}, 'b51a2e619c43b1ca4f91d15c57455521d71d61eb'),
(('salt', 'value'), {}, 'b51a2e619c43b1ca4f91d15c57455521d71d61eb'),
(
('salt', 'value'),
{'secret': 'abcdefg'},
'8bbee04ccddfa24772d1423a0ba43bd0c0e24b76',
),
(
('salt', 'value'),
{'secret': 'x' * hashlib.sha1().block_size},
'bd3749347b412b1b0a9ea65220e55767ac8e96b0',
),
]
for args, kwargs, digest in tests:
with self.subTest(args=args, kwargs=kwargs):
self.assertEqual(salted_hmac(*args, **kwargs).hexdigest(), digest)
class TestUtilsCryptoPBKDF2(unittest.TestCase):
# http://tools.ietf.org/html/draft-josefsson-pbkdf2-test-vectors-06
rfc_vectors = [
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "0c60c80f961f0e71f3a9b524af6012062fe037a6",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 2,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 4096,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "4b007901b765489abead49d926f721d065a429c1",
},
# # this takes way too long :(
# {
# "args": {
# "password": "password",
# "salt": "salt",
# "iterations": 16777216,
# "dklen": 20,
# "digest": hashlib.sha1,
# },
# "result": "eefe3d61cd4da4e4e9945b3d6ba2158c2634e984",
# },
{
"args": {
"password": "passwordPASSWORDpassword",
"salt": "saltSALTsaltSALTsaltSALTsaltSALTsalt",
"iterations": 4096,
"dklen": 25,
"digest": hashlib.sha1,
},
"result": "3d2eec4fe41c849b80c8d83662c0e44a8b291a964cf2f07038",
},
{
"args": {
"password": "pass\0word",
"salt": "sa\0lt",
"iterations": 4096,
"dklen": 16,
"digest": hashlib.sha1,
},
"result": "56fa6aa75548099dcc37d7f03425e0c3",
},
]
regression_vectors = [
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha256,
},
"result": "120fb6cffcf8b32c43e7225256c4f837a86548c9",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha512,
},
"result": "867f70cf1ade02cff3752599a3a53dc4af34c7a6",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1000,
"dklen": 0,
"digest": hashlib.sha512,
},
"result": ("afe6c5530785b6cc6b1c6453384731bd5ee432ee"
"549fd42fb6695779ad8a1c5bf59de69c48f774ef"
"c4007d5298f9033c0241d5ab69305e7b64eceeb8d"
"834cfec"),
},
# Check leading zeros are not stripped (#17481)
{
"args": {
"password": b'\xba',
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": '0053d3b91a7f1e54effebd6d68771e8a6e0b2c5b',
},
]
def test_public_vectors(self):
for vector in self.rfc_vectors:
result = pbkdf2(**vector['args'])
self.assertEqual(result.hex(), vector['result'])
def test_regression_vectors(self):
for vector in self.regression_vectors:
result = pbkdf2(**vector['args'])
self.assertEqual(result.hex(), vector['result'])
def test_default_hmac_alg(self):
kwargs = {'password': b'password', 'salt': b'salt', 'iterations': 1, 'dklen': 20}
self.assertEqual(pbkdf2(**kwargs), hashlib.pbkdf2_hmac(hash_name=hashlib.sha256().name, **kwargs))
|
182d87d8c3d1e9b3f6d07af46a96c3cbdccdcb689f0a9b58cfea5c0c7c41455c | # Django documentation build configuration file, created by
# sphinx-quickstart on Thu Mar 27 09:06:53 2008.
#
# This file is execfile()d with the current directory set to its containing dir.
#
# The contents of this file are pickled, so don't put values in the namespace
# that aren't picklable (module imports are okay, they're removed automatically).
#
# All configuration values have a default; values that are commented out
# serve to show the default.
import sys
from os.path import abspath, dirname, join
# Workaround for sphinx-build recursion limit overflow:
# pickle.dump(doctree, f, pickle.HIGHEST_PROTOCOL)
# RuntimeError: maximum recursion depth exceeded while pickling an object
#
# Python's default allowed recursion depth is 1000 but this isn't enough for
# building docs/ref/settings.txt sometimes.
# https://groups.google.com/d/topic/sphinx-dev/MtRf64eGtv4/discussion
sys.setrecursionlimit(2000)
# Make sure we get the version of this copy of Django
sys.path.insert(1, dirname(dirname(abspath(__file__))))
# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
sys.path.append(abspath(join(dirname(__file__), "_ext")))
# -- General configuration -----------------------------------------------------
# If your documentation needs a minimal Sphinx version, state it here.
needs_sphinx = '1.6.0'
# Add any Sphinx extension module names here, as strings. They can be extensions
# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
extensions = [
"djangodocs",
'sphinx.ext.extlinks',
"sphinx.ext.intersphinx",
"sphinx.ext.viewcode",
"sphinx.ext.autosectionlabel",
]
# AutosectionLabel settings.
# Uses a <page>:<label> schema which doesn't work for duplicate sub-section
# labels, so set max depth.
autosectionlabel_prefix_document = True
autosectionlabel_maxdepth = 2
# Spelling check needs an additional module that is not installed by default.
# Add it only if spelling check is requested so docs can be generated without it.
if 'spelling' in sys.argv:
extensions.append("sphinxcontrib.spelling")
# Spelling language.
spelling_lang = 'en_US'
# Location of word list.
spelling_word_list_filename = 'spelling_wordlist'
# Add any paths that contain templates here, relative to this directory.
# templates_path = []
# The suffix of source filenames.
source_suffix = '.txt'
# The encoding of source files.
# source_encoding = 'utf-8-sig'
# The master toctree document.
master_doc = 'contents'
# General substitutions.
project = 'Django'
copyright = 'Django Software Foundation and contributors'
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# The short X.Y version.
version = '3.1'
# The full version, including alpha/beta/rc tags.
try:
from django import VERSION, get_version
except ImportError:
release = version
else:
def django_release():
pep440ver = get_version()
if VERSION[3:5] == ('alpha', 0) and 'dev' not in pep440ver:
return pep440ver + '.dev'
return pep440ver
release = django_release()
# The "development version" of Django
django_next_version = '3.1'
extlinks = {
'commit': ('https://github.com/django/django/commit/%s', ''),
'cve': ('https://nvd.nist.gov/view/vuln/detail?vulnId=%s', 'CVE-'),
# A file or directory. GitHub redirects from blob to tree if needed.
'source': ('https://github.com/django/django/blob/master/%s', ''),
'ticket': ('https://code.djangoproject.com/ticket/%s', '#'),
}
# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
# language = None
# Location for .po/.mo translation files used when language is set
locale_dirs = ['locale/']
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
# today = ''
# Else, today_fmt is used as the format for a strftime call.
today_fmt = '%B %d, %Y'
# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
exclude_patterns = ['_build', '_theme']
# The reST default role (used for this markup: `text`) to use for all documents.
# default_role = None
# If true, '()' will be appended to :func: etc. cross-reference text.
add_function_parentheses = True
# If true, the current module name will be prepended to all description
# unit titles (such as .. function::).
add_module_names = False
# If true, sectionauthor and moduleauthor directives will be shown in the
# output. They are ignored by default.
show_authors = False
# The name of the Pygments (syntax highlighting) style to use.
pygments_style = 'trac'
# Links to Python's docs should reference the most recent version of the 3.x
# branch, which is located at this URL.
intersphinx_mapping = {
'python': ('https://docs.python.org/3/', None),
'sphinx': ('https://www.sphinx-doc.org/en/master/', None),
'psycopg2': ('https://www.psycopg.org/docs/', None),
}
# Python's docs don't change every week.
intersphinx_cache_limit = 90 # days
# The 'versionadded' and 'versionchanged' directives are overridden.
suppress_warnings = ['app.add_directive']
# -- Options for HTML output ---------------------------------------------------
# The theme to use for HTML and HTML Help pages. See the documentation for
# a list of builtin themes.
html_theme = "djangodocs"
# Theme options are theme-specific and customize the look and feel of a theme
# further. For a list of options available for each theme, see the
# documentation.
# html_theme_options = {}
# Add any paths that contain custom themes here, relative to this directory.
html_theme_path = ["_theme"]
# The name for this set of Sphinx documents. If None, it defaults to
# "<project> v<release> documentation".
# html_title = None
# A shorter title for the navigation bar. Default is the same as html_title.
# html_short_title = None
# The name of an image file (relative to this directory) to place at the top
# of the sidebar.
# html_logo = None
# The name of an image file (within the static path) to use as favicon of the
# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
# pixels large.
# html_favicon = None
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
# html_static_path = ["_static"]
# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
# using the given strftime format.
html_last_updated_fmt = '%b %d, %Y'
# Content template for the index page.
# html_index = ''
# Custom sidebar templates, maps document names to template names.
# html_sidebars = {}
# Additional templates that should be rendered to pages, maps page names to
# template names.
html_additional_pages = {}
# If false, no module index is generated.
# html_domain_indices = True
# If false, no index is generated.
# html_use_index = True
# If true, the index is split into individual pages for each letter.
# html_split_index = False
# If true, links to the reST sources are added to the pages.
# html_show_sourcelink = True
# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
# html_show_sphinx = True
# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
# html_show_copyright = True
# If true, an OpenSearch description file will be output, and all pages will
# contain a <link> tag referring to it. The value of this option must be the
# base URL from which the finished HTML is served.
# html_use_opensearch = ''
# This is the file name suffix for HTML files (e.g. ".xhtml").
# html_file_suffix = None
# Output file base name for HTML help builder.
htmlhelp_basename = 'Djangodoc'
modindex_common_prefix = ["django."]
# Appended to every page
rst_epilog = """
.. |django-users| replace:: :ref:`django-users <django-users-mailing-list>`
.. |django-core-mentorship| replace:: :ref:`django-core-mentorship <django-core-mentorship-mailing-list>`
.. |django-developers| replace:: :ref:`django-developers <django-developers-mailing-list>`
.. |django-announce| replace:: :ref:`django-announce <django-announce-mailing-list>`
.. |django-updates| replace:: :ref:`django-updates <django-updates-mailing-list>`
"""
# -- Options for LaTeX output --------------------------------------------------
latex_elements = {
'preamble': (
'\\DeclareUnicodeCharacter{2264}{\\ensuremath{\\le}}'
'\\DeclareUnicodeCharacter{2265}{\\ensuremath{\\ge}}'
'\\DeclareUnicodeCharacter{2665}{[unicode-heart]}'
'\\DeclareUnicodeCharacter{2713}{[unicode-checkmark]}'
),
}
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title, author, document class [howto/manual]).
# latex_documents = []
latex_documents = [
('contents', 'django.tex', 'Django Documentation',
'Django Software Foundation', 'manual'),
]
# The name of an image file (relative to this directory) to place at the top of
# the title page.
# latex_logo = None
# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
# latex_use_parts = False
# If true, show page references after internal links.
# latex_show_pagerefs = False
# If true, show URL addresses after external links.
# latex_show_urls = False
# Documents to append as an appendix to all manuals.
# latex_appendices = []
# If false, no module index is generated.
# latex_domain_indices = True
# -- Options for manual page output --------------------------------------------
# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [(
'ref/django-admin',
'django-admin',
'Utility script for the Django Web framework',
['Django Software Foundation'],
1
)]
# -- Options for Texinfo output ------------------------------------------------
# List of tuples (startdocname, targetname, title, author, dir_entry,
# description, category, toctree_only)
texinfo_documents = [(
master_doc, "django", "", "", "Django",
"Documentation of the Django framework", "Web development", False
)]
# -- Options for Epub output ---------------------------------------------------
# Bibliographic Dublin Core info.
epub_title = project
epub_author = 'Django Software Foundation'
epub_publisher = 'Django Software Foundation'
epub_copyright = copyright
# The basename for the epub file. It defaults to the project name.
# epub_basename = 'Django'
# The HTML theme for the epub output. Since the default themes are not optimized
# for small screen space, using the same theme for HTML and epub output is
# usually not wise. This defaults to 'epub', a theme designed to save visual
# space.
epub_theme = 'djangodocs-epub'
# The language of the text. It defaults to the language option
# or en if the language is not set.
# epub_language = ''
# The scheme of the identifier. Typical schemes are ISBN or URL.
# epub_scheme = ''
# The unique identifier of the text. This can be an ISBN number
# or the project homepage.
# epub_identifier = ''
# A unique identification for the text.
# epub_uid = ''
# A tuple containing the cover image and cover page html template filenames.
epub_cover = ('', 'epub-cover.html')
# A sequence of (type, uri, title) tuples for the guide element of content.opf.
# epub_guide = ()
# HTML files that should be inserted before the pages created by sphinx.
# The format is a list of tuples containing the path and title.
# epub_pre_files = []
# HTML files shat should be inserted after the pages created by sphinx.
# The format is a list of tuples containing the path and title.
# epub_post_files = []
# A list of files that should not be packed into the epub file.
# epub_exclude_files = []
# The depth of the table of contents in toc.ncx.
# epub_tocdepth = 3
# Allow duplicate toc entries.
# epub_tocdup = True
# Choose between 'default' and 'includehidden'.
# epub_tocscope = 'default'
# Fix unsupported image types using the PIL.
# epub_fix_images = False
# Scale large images.
# epub_max_image_width = 0
# How to display URL addresses: 'footnote', 'no', or 'inline'.
# epub_show_urls = 'inline'
# If false, no index is generated.
# epub_use_index = True
|
f236a926996d85bdc3f1a6bd74cc5c3423249f15846ce840cab2449c085ed34a | import itertools
import json
import os
import re
from urllib.parse import unquote
from django.apps import apps
from django.conf import settings
from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
from django.template import Context, Engine
from django.urls import translate_url
from django.utils.formats import get_format
from django.utils.http import url_has_allowed_host_and_scheme
from django.utils.translation import (
LANGUAGE_SESSION_KEY, check_for_language, get_language,
)
from django.utils.translation.trans_real import DjangoTranslation
from django.views.generic import View
LANGUAGE_QUERY_PARAMETER = 'language'
def set_language(request):
"""
Redirect to a given URL while setting the chosen language in the session
(if enabled) and in a cookie. The URL and the language code need to be
specified in the request parameters.
Since this view changes how the user will see the rest of the site, it must
only be accessed as a POST request. If called as a GET request, it will
redirect to the page in the request (the 'next' parameter) without changing
any state.
"""
next_url = request.POST.get('next', request.GET.get('next'))
if (
(next_url or request.accepts('text/html')) and
not url_has_allowed_host_and_scheme(
url=next_url,
allowed_hosts={request.get_host()},
require_https=request.is_secure(),
)
):
next_url = request.META.get('HTTP_REFERER')
# HTTP_REFERER may be encoded.
next_url = next_url and unquote(next_url)
if not url_has_allowed_host_and_scheme(
url=next_url,
allowed_hosts={request.get_host()},
require_https=request.is_secure(),
):
next_url = '/'
response = HttpResponseRedirect(next_url) if next_url else HttpResponse(status=204)
if request.method == 'POST':
lang_code = request.POST.get(LANGUAGE_QUERY_PARAMETER)
if lang_code and check_for_language(lang_code):
if next_url:
next_trans = translate_url(next_url, lang_code)
if next_trans != next_url:
response = HttpResponseRedirect(next_trans)
if hasattr(request, 'session'):
# Storing the language in the session is deprecated.
# (RemovedInDjango40Warning)
request.session[LANGUAGE_SESSION_KEY] = lang_code
response.set_cookie(
settings.LANGUAGE_COOKIE_NAME, lang_code,
max_age=settings.LANGUAGE_COOKIE_AGE,
path=settings.LANGUAGE_COOKIE_PATH,
domain=settings.LANGUAGE_COOKIE_DOMAIN,
secure=settings.LANGUAGE_COOKIE_SECURE,
httponly=settings.LANGUAGE_COOKIE_HTTPONLY,
samesite=settings.LANGUAGE_COOKIE_SAMESITE,
)
return response
def get_formats():
"""Return all formats strings required for i18n to work."""
FORMAT_SETTINGS = (
'DATE_FORMAT', 'DATETIME_FORMAT', 'TIME_FORMAT',
'YEAR_MONTH_FORMAT', 'MONTH_DAY_FORMAT', 'SHORT_DATE_FORMAT',
'SHORT_DATETIME_FORMAT', 'FIRST_DAY_OF_WEEK', 'DECIMAL_SEPARATOR',
'THOUSAND_SEPARATOR', 'NUMBER_GROUPING',
'DATE_INPUT_FORMATS', 'TIME_INPUT_FORMATS', 'DATETIME_INPUT_FORMATS'
)
return {attr: get_format(attr) for attr in FORMAT_SETTINGS}
js_catalog_template = r"""
{% autoescape off %}
(function(globals) {
var django = globals.django || (globals.django = {});
{% if plural %}
django.pluralidx = function(n) {
var v={{ plural }};
if (typeof(v) == 'boolean') {
return v ? 1 : 0;
} else {
return v;
}
};
{% else %}
django.pluralidx = function(count) { return (count == 1) ? 0 : 1; };
{% endif %}
/* gettext library */
django.catalog = django.catalog || {};
{% if catalog_str %}
var newcatalog = {{ catalog_str }};
for (var key in newcatalog) {
django.catalog[key] = newcatalog[key];
}
{% endif %}
if (!django.jsi18n_initialized) {
django.gettext = function(msgid) {
var value = django.catalog[msgid];
if (typeof(value) == 'undefined') {
return msgid;
} else {
return (typeof(value) == 'string') ? value : value[0];
}
};
django.ngettext = function(singular, plural, count) {
var value = django.catalog[singular];
if (typeof(value) == 'undefined') {
return (count == 1) ? singular : plural;
} else {
return value.constructor === Array ? value[django.pluralidx(count)] : value;
}
};
django.gettext_noop = function(msgid) { return msgid; };
django.pgettext = function(context, msgid) {
var value = django.gettext(context + '\x04' + msgid);
if (value.indexOf('\x04') != -1) {
value = msgid;
}
return value;
};
django.npgettext = function(context, singular, plural, count) {
var value = django.ngettext(context + '\x04' + singular, context + '\x04' + plural, count);
if (value.indexOf('\x04') != -1) {
value = django.ngettext(singular, plural, count);
}
return value;
};
django.interpolate = function(fmt, obj, named) {
if (named) {
return fmt.replace(/%\(\w+\)s/g, function(match){return String(obj[match.slice(2,-2)])});
} else {
return fmt.replace(/%s/g, function(match){return String(obj.shift())});
}
};
/* formatting library */
django.formats = {{ formats_str }};
django.get_format = function(format_type) {
var value = django.formats[format_type];
if (typeof(value) == 'undefined') {
return format_type;
} else {
return value;
}
};
/* add to global namespace */
globals.pluralidx = django.pluralidx;
globals.gettext = django.gettext;
globals.ngettext = django.ngettext;
globals.gettext_noop = django.gettext_noop;
globals.pgettext = django.pgettext;
globals.npgettext = django.npgettext;
globals.interpolate = django.interpolate;
globals.get_format = django.get_format;
django.jsi18n_initialized = true;
}
}(this));
{% endautoescape %}
"""
class JavaScriptCatalog(View):
"""
Return the selected language catalog as a JavaScript library.
Receive the list of packages to check for translations in the `packages`
kwarg either from the extra dictionary passed to the url() function or as a
plus-sign delimited string from the request. Default is 'django.conf'.
You can override the gettext domain for this view, but usually you don't
want to do that as JavaScript messages go to the djangojs domain. This
might be needed if you deliver your JavaScript source from Django templates.
"""
domain = 'djangojs'
packages = None
def get(self, request, *args, **kwargs):
locale = get_language()
domain = kwargs.get('domain', self.domain)
# If packages are not provided, default to all installed packages, as
# DjangoTranslation without localedirs harvests them all.
packages = kwargs.get('packages', '')
packages = packages.split('+') if packages else self.packages
paths = self.get_paths(packages) if packages else None
self.translation = DjangoTranslation(locale, domain=domain, localedirs=paths)
context = self.get_context_data(**kwargs)
return self.render_to_response(context)
def get_paths(self, packages):
allowable_packages = {app_config.name: app_config for app_config in apps.get_app_configs()}
app_configs = [allowable_packages[p] for p in packages if p in allowable_packages]
if len(app_configs) < len(packages):
excluded = [p for p in packages if p not in allowable_packages]
raise ValueError(
'Invalid package(s) provided to JavaScriptCatalog: %s' % ','.join(excluded)
)
# paths of requested packages
return [os.path.join(app.path, 'locale') for app in app_configs]
@property
def _num_plurals(self):
"""
Return the number of plurals for this catalog language, or 2 if no
plural string is available.
"""
match = re.search(r'nplurals=\s*(\d+)', self._plural_string or '')
if match:
return int(match.groups()[0])
return 2
@property
def _plural_string(self):
"""
Return the plural string (including nplurals) for this catalog language,
or None if no plural string is available.
"""
if '' in self.translation._catalog:
for line in self.translation._catalog[''].split('\n'):
if line.startswith('Plural-Forms:'):
return line.split(':', 1)[1].strip()
return None
def get_plural(self):
plural = self._plural_string
if plural is not None:
# This should be a compiled function of a typical plural-form:
# Plural-Forms: nplurals=3; plural=n%10==1 && n%100!=11 ? 0 :
# n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;
plural = [el.strip() for el in plural.split(';') if el.strip().startswith('plural=')][0].split('=', 1)[1]
return plural
def get_catalog(self):
pdict = {}
num_plurals = self._num_plurals
catalog = {}
trans_cat = self.translation._catalog
trans_fallback_cat = self.translation._fallback._catalog if self.translation._fallback else {}
seen_keys = set()
for key, value in itertools.chain(trans_cat.items(), trans_fallback_cat.items()):
if key == '' or key in seen_keys:
continue
if isinstance(key, str):
catalog[key] = value
elif isinstance(key, tuple):
msgid, cnt = key
pdict.setdefault(msgid, {})[cnt] = value
else:
raise TypeError(key)
seen_keys.add(key)
for k, v in pdict.items():
catalog[k] = [v.get(i, '') for i in range(num_plurals)]
return catalog
def get_context_data(self, **kwargs):
return {
'catalog': self.get_catalog(),
'formats': get_formats(),
'plural': self.get_plural(),
}
def render_to_response(self, context, **response_kwargs):
def indent(s):
return s.replace('\n', '\n ')
template = Engine().from_string(js_catalog_template)
context['catalog_str'] = indent(
json.dumps(context['catalog'], sort_keys=True, indent=2)
) if context['catalog'] else None
context['formats_str'] = indent(json.dumps(context['formats'], sort_keys=True, indent=2))
return HttpResponse(template.render(Context(context)), 'text/javascript; charset="utf-8"')
class JSONCatalog(JavaScriptCatalog):
"""
Return the selected language catalog as a JSON object.
Receive the same parameters as JavaScriptCatalog and return a response
with a JSON object of the following format:
{
"catalog": {
# Translations catalog
},
"formats": {
# Language formats for date, time, etc.
},
"plural": '...' # Expression for plural forms, or null.
}
"""
def render_to_response(self, context, **response_kwargs):
return JsonResponse(context)
|
389d23d4bbb32c06246800ebc52ae3ad45f169b9e75dcc5a0d113b96858f6968 | import functools
import re
import sys
import types
from pathlib import Path
from django.conf import settings
from django.http import Http404, HttpResponse, HttpResponseNotFound
from django.template import Context, Engine, TemplateDoesNotExist
from django.template.defaultfilters import pprint
from django.urls import resolve
from django.utils import timezone
from django.utils.datastructures import MultiValueDict
from django.utils.encoding import force_str
from django.utils.module_loading import import_string
from django.utils.regex_helper import _lazy_re_compile
from django.utils.version import get_docs_version
# Minimal Django templates engine to render the error templates
# regardless of the project's TEMPLATES setting. Templates are
# read directly from the filesystem so that the error handler
# works even if the template loader is broken.
DEBUG_ENGINE = Engine(
debug=True,
libraries={'i18n': 'django.templatetags.i18n'},
)
CURRENT_DIR = Path(__file__).parent
class CallableSettingWrapper:
"""
Object to wrap callable appearing in settings.
* Not to call in the debug page (#21345).
* Not to break the debug page if the callable forbidding to set attributes
(#23070).
"""
def __init__(self, callable_setting):
self._wrapped = callable_setting
def __repr__(self):
return repr(self._wrapped)
def technical_500_response(request, exc_type, exc_value, tb, status_code=500):
"""
Create a technical server error response. The last three arguments are
the values returned from sys.exc_info() and friends.
"""
reporter = get_exception_reporter_class(request)(request, exc_type, exc_value, tb)
if request.accepts('text/html'):
html = reporter.get_traceback_html()
return HttpResponse(html, status=status_code, content_type='text/html')
else:
text = reporter.get_traceback_text()
return HttpResponse(text, status=status_code, content_type='text/plain; charset=utf-8')
@functools.lru_cache()
def get_default_exception_reporter_filter():
# Instantiate the default filter for the first time and cache it.
return import_string(settings.DEFAULT_EXCEPTION_REPORTER_FILTER)()
def get_exception_reporter_filter(request):
default_filter = get_default_exception_reporter_filter()
return getattr(request, 'exception_reporter_filter', default_filter)
def get_exception_reporter_class(request):
default_exception_reporter_class = import_string(settings.DEFAULT_EXCEPTION_REPORTER)
return getattr(request, 'exception_reporter_class', default_exception_reporter_class)
class SafeExceptionReporterFilter:
"""
Use annotations made by the sensitive_post_parameters and
sensitive_variables decorators to filter out sensitive information.
"""
cleansed_substitute = '********************'
hidden_settings = _lazy_re_compile('API|TOKEN|KEY|SECRET|PASS|SIGNATURE', flags=re.I)
def cleanse_setting(self, key, value):
"""
Cleanse an individual setting key/value of sensitive content. If the
value is a dictionary, recursively cleanse the keys in that dictionary.
"""
try:
if self.hidden_settings.search(key):
cleansed = self.cleansed_substitute
elif isinstance(value, dict):
cleansed = {k: self.cleanse_setting(k, v) for k, v in value.items()}
else:
cleansed = value
except TypeError:
# If the key isn't regex-able, just return as-is.
cleansed = value
if callable(cleansed):
cleansed = CallableSettingWrapper(cleansed)
return cleansed
def get_safe_settings(self):
"""
Return a dictionary of the settings module with values of sensitive
settings replaced with stars (*********).
"""
settings_dict = {}
for k in dir(settings):
if k.isupper():
settings_dict[k] = self.cleanse_setting(k, getattr(settings, k))
return settings_dict
def get_safe_request_meta(self, request):
"""
Return a dictionary of request.META with sensitive values redacted.
"""
if not hasattr(request, 'META'):
return {}
return {k: self.cleanse_setting(k, v) for k, v in request.META.items()}
def is_active(self, request):
"""
This filter is to add safety in production environments (i.e. DEBUG
is False). If DEBUG is True then your site is not safe anyway.
This hook is provided as a convenience to easily activate or
deactivate the filter on a per request basis.
"""
return settings.DEBUG is False
def get_cleansed_multivaluedict(self, request, multivaluedict):
"""
Replace the keys in a MultiValueDict marked as sensitive with stars.
This mitigates leaking sensitive POST parameters if something like
request.POST['nonexistent_key'] throws an exception (#21098).
"""
sensitive_post_parameters = getattr(request, 'sensitive_post_parameters', [])
if self.is_active(request) and sensitive_post_parameters:
multivaluedict = multivaluedict.copy()
for param in sensitive_post_parameters:
if param in multivaluedict:
multivaluedict[param] = self.cleansed_substitute
return multivaluedict
def get_post_parameters(self, request):
"""
Replace the values of POST parameters marked as sensitive with
stars (*********).
"""
if request is None:
return {}
else:
sensitive_post_parameters = getattr(request, 'sensitive_post_parameters', [])
if self.is_active(request) and sensitive_post_parameters:
cleansed = request.POST.copy()
if sensitive_post_parameters == '__ALL__':
# Cleanse all parameters.
for k in cleansed:
cleansed[k] = self.cleansed_substitute
return cleansed
else:
# Cleanse only the specified parameters.
for param in sensitive_post_parameters:
if param in cleansed:
cleansed[param] = self.cleansed_substitute
return cleansed
else:
return request.POST
def cleanse_special_types(self, request, value):
try:
# If value is lazy or a complex object of another kind, this check
# might raise an exception. isinstance checks that lazy
# MultiValueDicts will have a return value.
is_multivalue_dict = isinstance(value, MultiValueDict)
except Exception as e:
return '{!r} while evaluating {!r}'.format(e, value)
if is_multivalue_dict:
# Cleanse MultiValueDicts (request.POST is the one we usually care about)
value = self.get_cleansed_multivaluedict(request, value)
return value
def get_traceback_frame_variables(self, request, tb_frame):
"""
Replace the values of variables marked as sensitive with
stars (*********).
"""
# Loop through the frame's callers to see if the sensitive_variables
# decorator was used.
current_frame = tb_frame.f_back
sensitive_variables = None
while current_frame is not None:
if (current_frame.f_code.co_name == 'sensitive_variables_wrapper' and
'sensitive_variables_wrapper' in current_frame.f_locals):
# The sensitive_variables decorator was used, so we take note
# of the sensitive variables' names.
wrapper = current_frame.f_locals['sensitive_variables_wrapper']
sensitive_variables = getattr(wrapper, 'sensitive_variables', None)
break
current_frame = current_frame.f_back
cleansed = {}
if self.is_active(request) and sensitive_variables:
if sensitive_variables == '__ALL__':
# Cleanse all variables
for name in tb_frame.f_locals:
cleansed[name] = self.cleansed_substitute
else:
# Cleanse specified variables
for name, value in tb_frame.f_locals.items():
if name in sensitive_variables:
value = self.cleansed_substitute
else:
value = self.cleanse_special_types(request, value)
cleansed[name] = value
else:
# Potentially cleanse the request and any MultiValueDicts if they
# are one of the frame variables.
for name, value in tb_frame.f_locals.items():
cleansed[name] = self.cleanse_special_types(request, value)
if (tb_frame.f_code.co_name == 'sensitive_variables_wrapper' and
'sensitive_variables_wrapper' in tb_frame.f_locals):
# For good measure, obfuscate the decorated function's arguments in
# the sensitive_variables decorator's frame, in case the variables
# associated with those arguments were meant to be obfuscated from
# the decorated function's frame.
cleansed['func_args'] = self.cleansed_substitute
cleansed['func_kwargs'] = self.cleansed_substitute
return cleansed.items()
class ExceptionReporter:
"""Organize and coordinate reporting on exceptions."""
def __init__(self, request, exc_type, exc_value, tb, is_email=False):
self.request = request
self.filter = get_exception_reporter_filter(self.request)
self.exc_type = exc_type
self.exc_value = exc_value
self.tb = tb
self.is_email = is_email
self.template_info = getattr(self.exc_value, 'template_debug', None)
self.template_does_not_exist = False
self.postmortem = None
def get_traceback_data(self):
"""Return a dictionary containing traceback information."""
if self.exc_type and issubclass(self.exc_type, TemplateDoesNotExist):
self.template_does_not_exist = True
self.postmortem = self.exc_value.chain or [self.exc_value]
frames = self.get_traceback_frames()
for i, frame in enumerate(frames):
if 'vars' in frame:
frame_vars = []
for k, v in frame['vars']:
v = pprint(v)
# Trim large blobs of data
if len(v) > 4096:
v = '%s… <trimmed %d bytes string>' % (v[0:4096], len(v))
frame_vars.append((k, v))
frame['vars'] = frame_vars
frames[i] = frame
unicode_hint = ''
if self.exc_type and issubclass(self.exc_type, UnicodeError):
start = getattr(self.exc_value, 'start', None)
end = getattr(self.exc_value, 'end', None)
if start is not None and end is not None:
unicode_str = self.exc_value.args[1]
unicode_hint = force_str(
unicode_str[max(start - 5, 0):min(end + 5, len(unicode_str))],
'ascii', errors='replace'
)
from django import get_version
if self.request is None:
user_str = None
else:
try:
user_str = str(self.request.user)
except Exception:
# request.user may raise OperationalError if the database is
# unavailable, for example.
user_str = '[unable to retrieve the current user]'
c = {
'is_email': self.is_email,
'unicode_hint': unicode_hint,
'frames': frames,
'request': self.request,
'request_meta': self.filter.get_safe_request_meta(self.request),
'user_str': user_str,
'filtered_POST_items': list(self.filter.get_post_parameters(self.request).items()),
'settings': self.filter.get_safe_settings(),
'sys_executable': sys.executable,
'sys_version_info': '%d.%d.%d' % sys.version_info[0:3],
'server_time': timezone.now(),
'django_version_info': get_version(),
'sys_path': sys.path,
'template_info': self.template_info,
'template_does_not_exist': self.template_does_not_exist,
'postmortem': self.postmortem,
}
if self.request is not None:
c['request_GET_items'] = self.request.GET.items()
c['request_FILES_items'] = self.request.FILES.items()
c['request_COOKIES_items'] = self.request.COOKIES.items()
# Check whether exception info is available
if self.exc_type:
c['exception_type'] = self.exc_type.__name__
if self.exc_value:
c['exception_value'] = str(self.exc_value)
if frames:
c['lastframe'] = frames[-1]
return c
def get_traceback_html(self):
"""Return HTML version of debug 500 HTTP error page."""
with Path(CURRENT_DIR, 'templates', 'technical_500.html').open(encoding='utf-8') as fh:
t = DEBUG_ENGINE.from_string(fh.read())
c = Context(self.get_traceback_data(), use_l10n=False)
return t.render(c)
def get_traceback_text(self):
"""Return plain text version of debug 500 HTTP error page."""
with Path(CURRENT_DIR, 'templates', 'technical_500.txt').open(encoding='utf-8') as fh:
t = DEBUG_ENGINE.from_string(fh.read())
c = Context(self.get_traceback_data(), autoescape=False, use_l10n=False)
return t.render(c)
def _get_source(self, filename, loader, module_name):
source = None
if hasattr(loader, 'get_source'):
try:
source = loader.get_source(module_name)
except ImportError:
pass
if source is not None:
source = source.splitlines()
if source is None:
try:
with open(filename, 'rb') as fp:
source = fp.read().splitlines()
except OSError:
pass
return source
def _get_lines_from_file(self, filename, lineno, context_lines, loader=None, module_name=None):
"""
Return context_lines before and after lineno from file.
Return (pre_context_lineno, pre_context, context_line, post_context).
"""
source = self._get_source(filename, loader, module_name)
if source is None:
return None, [], None, []
# If we just read the source from a file, or if the loader did not
# apply tokenize.detect_encoding to decode the source into a
# string, then we should do that ourselves.
if isinstance(source[0], bytes):
encoding = 'ascii'
for line in source[:2]:
# File coding may be specified. Match pattern from PEP-263
# (https://www.python.org/dev/peps/pep-0263/)
match = re.search(br'coding[:=]\s*([-\w.]+)', line)
if match:
encoding = match.group(1).decode('ascii')
break
source = [str(sline, encoding, 'replace') for sline in source]
lower_bound = max(0, lineno - context_lines)
upper_bound = lineno + context_lines
try:
pre_context = source[lower_bound:lineno]
context_line = source[lineno]
post_context = source[lineno + 1:upper_bound]
except IndexError:
return None, [], None, []
return lower_bound, pre_context, context_line, post_context
def get_traceback_frames(self):
def explicit_or_implicit_cause(exc_value):
explicit = getattr(exc_value, '__cause__', None)
implicit = getattr(exc_value, '__context__', None)
return explicit or implicit
# Get the exception and all its causes
exceptions = []
exc_value = self.exc_value
while exc_value:
exceptions.append(exc_value)
exc_value = explicit_or_implicit_cause(exc_value)
if exc_value in exceptions:
# Avoid infinite loop if there's a cyclic reference (#29393).
break
frames = []
# No exceptions were supplied to ExceptionReporter
if not exceptions:
return frames
# In case there's just one exception, take the traceback from self.tb
exc_value = exceptions.pop()
tb = self.tb if not exceptions else exc_value.__traceback__
while tb is not None:
# Support for __traceback_hide__ which is used by a few libraries
# to hide internal frames.
if tb.tb_frame.f_locals.get('__traceback_hide__'):
tb = tb.tb_next
continue
filename = tb.tb_frame.f_code.co_filename
function = tb.tb_frame.f_code.co_name
lineno = tb.tb_lineno - 1
loader = tb.tb_frame.f_globals.get('__loader__')
module_name = tb.tb_frame.f_globals.get('__name__') or ''
pre_context_lineno, pre_context, context_line, post_context = self._get_lines_from_file(
filename, lineno, 7, loader, module_name,
)
if pre_context_lineno is None:
pre_context_lineno = lineno
pre_context = []
context_line = '<source code not available>'
post_context = []
frames.append({
'exc_cause': explicit_or_implicit_cause(exc_value),
'exc_cause_explicit': getattr(exc_value, '__cause__', True),
'tb': tb,
'type': 'django' if module_name.startswith('django.') else 'user',
'filename': filename,
'function': function,
'lineno': lineno + 1,
'vars': self.filter.get_traceback_frame_variables(self.request, tb.tb_frame),
'id': id(tb),
'pre_context': pre_context,
'context_line': context_line,
'post_context': post_context,
'pre_context_lineno': pre_context_lineno + 1,
})
# If the traceback for current exception is consumed, try the
# other exception.
if not tb.tb_next and exceptions:
exc_value = exceptions.pop()
tb = exc_value.__traceback__
else:
tb = tb.tb_next
return frames
def technical_404_response(request, exception):
"""Create a technical 404 error response. `exception` is the Http404."""
try:
error_url = exception.args[0]['path']
except (IndexError, TypeError, KeyError):
error_url = request.path_info[1:] # Trim leading slash
try:
tried = exception.args[0]['tried']
except (IndexError, TypeError, KeyError):
tried = []
else:
if (not tried or ( # empty URLconf
request.path == '/' and
len(tried) == 1 and # default URLconf
len(tried[0]) == 1 and
getattr(tried[0][0], 'app_name', '') == getattr(tried[0][0], 'namespace', '') == 'admin'
)):
return default_urlconf(request)
urlconf = getattr(request, 'urlconf', settings.ROOT_URLCONF)
if isinstance(urlconf, types.ModuleType):
urlconf = urlconf.__name__
caller = ''
try:
resolver_match = resolve(request.path)
except Http404:
pass
else:
obj = resolver_match.func
if hasattr(obj, '__name__'):
caller = obj.__name__
elif hasattr(obj, '__class__') and hasattr(obj.__class__, '__name__'):
caller = obj.__class__.__name__
if hasattr(obj, '__module__'):
module = obj.__module__
caller = '%s.%s' % (module, caller)
with Path(CURRENT_DIR, 'templates', 'technical_404.html').open(encoding='utf-8') as fh:
t = DEBUG_ENGINE.from_string(fh.read())
reporter_filter = get_default_exception_reporter_filter()
c = Context({
'urlconf': urlconf,
'root_urlconf': settings.ROOT_URLCONF,
'request_path': error_url,
'urlpatterns': tried,
'reason': str(exception),
'request': request,
'settings': reporter_filter.get_safe_settings(),
'raising_view_name': caller,
})
return HttpResponseNotFound(t.render(c), content_type='text/html')
def default_urlconf(request):
"""Create an empty URLconf 404 error response."""
with Path(CURRENT_DIR, 'templates', 'default_urlconf.html').open(encoding='utf-8') as fh:
t = DEBUG_ENGINE.from_string(fh.read())
c = Context({
'version': get_docs_version(),
})
return HttpResponse(t.render(c), content_type='text/html')
|
bdb602803296753482ab9fc0858cddc824003f503d7a021b9cee6f3bb40439f1 | """
Default Django settings. Override these with settings in the module pointed to
by the DJANGO_SETTINGS_MODULE environment variable.
"""
# This is defined here as a do-nothing function because we can't import
# django.utils.translation -- that module depends on the settings.
def gettext_noop(s):
return s
####################
# CORE #
####################
DEBUG = False
# Whether the framework should propagate raw exceptions rather than catching
# them. This is useful under some testing situations and should never be used
# on a live site.
DEBUG_PROPAGATE_EXCEPTIONS = False
# People who get code error notifications.
# In the format [('Full Name', '[email protected]'), ('Full Name', '[email protected]')]
ADMINS = []
# List of IP addresses, as strings, that:
# * See debug comments, when DEBUG is true
# * Receive x-headers
INTERNAL_IPS = []
# Hosts/domain names that are valid for this site.
# "*" matches anything, ".example.com" matches example.com and all subdomains
ALLOWED_HOSTS = []
# Local time zone for this installation. All choices can be found here:
# https://en.wikipedia.org/wiki/List_of_tz_zones_by_name (although not all
# systems may support all possibilities). When USE_TZ is True, this is
# interpreted as the default user time zone.
TIME_ZONE = 'America/Chicago'
# If you set this to True, Django will use timezone-aware datetimes.
USE_TZ = False
# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
LANGUAGE_CODE = 'en-us'
# Languages we provide translations for, out of the box.
LANGUAGES = [
('af', gettext_noop('Afrikaans')),
('ar', gettext_noop('Arabic')),
('ar-dz', gettext_noop('Algerian Arabic')),
('ast', gettext_noop('Asturian')),
('az', gettext_noop('Azerbaijani')),
('bg', gettext_noop('Bulgarian')),
('be', gettext_noop('Belarusian')),
('bn', gettext_noop('Bengali')),
('br', gettext_noop('Breton')),
('bs', gettext_noop('Bosnian')),
('ca', gettext_noop('Catalan')),
('cs', gettext_noop('Czech')),
('cy', gettext_noop('Welsh')),
('da', gettext_noop('Danish')),
('de', gettext_noop('German')),
('dsb', gettext_noop('Lower Sorbian')),
('el', gettext_noop('Greek')),
('en', gettext_noop('English')),
('en-au', gettext_noop('Australian English')),
('en-gb', gettext_noop('British English')),
('eo', gettext_noop('Esperanto')),
('es', gettext_noop('Spanish')),
('es-ar', gettext_noop('Argentinian Spanish')),
('es-co', gettext_noop('Colombian Spanish')),
('es-mx', gettext_noop('Mexican Spanish')),
('es-ni', gettext_noop('Nicaraguan Spanish')),
('es-ve', gettext_noop('Venezuelan Spanish')),
('et', gettext_noop('Estonian')),
('eu', gettext_noop('Basque')),
('fa', gettext_noop('Persian')),
('fi', gettext_noop('Finnish')),
('fr', gettext_noop('French')),
('fy', gettext_noop('Frisian')),
('ga', gettext_noop('Irish')),
('gd', gettext_noop('Scottish Gaelic')),
('gl', gettext_noop('Galician')),
('he', gettext_noop('Hebrew')),
('hi', gettext_noop('Hindi')),
('hr', gettext_noop('Croatian')),
('hsb', gettext_noop('Upper Sorbian')),
('hu', gettext_noop('Hungarian')),
('hy', gettext_noop('Armenian')),
('ia', gettext_noop('Interlingua')),
('id', gettext_noop('Indonesian')),
('io', gettext_noop('Ido')),
('is', gettext_noop('Icelandic')),
('it', gettext_noop('Italian')),
('ja', gettext_noop('Japanese')),
('ka', gettext_noop('Georgian')),
('kab', gettext_noop('Kabyle')),
('kk', gettext_noop('Kazakh')),
('km', gettext_noop('Khmer')),
('kn', gettext_noop('Kannada')),
('ko', gettext_noop('Korean')),
('lb', gettext_noop('Luxembourgish')),
('lt', gettext_noop('Lithuanian')),
('lv', gettext_noop('Latvian')),
('mk', gettext_noop('Macedonian')),
('ml', gettext_noop('Malayalam')),
('mn', gettext_noop('Mongolian')),
('mr', gettext_noop('Marathi')),
('my', gettext_noop('Burmese')),
('nb', gettext_noop('Norwegian Bokmål')),
('ne', gettext_noop('Nepali')),
('nl', gettext_noop('Dutch')),
('nn', gettext_noop('Norwegian Nynorsk')),
('os', gettext_noop('Ossetic')),
('pa', gettext_noop('Punjabi')),
('pl', gettext_noop('Polish')),
('pt', gettext_noop('Portuguese')),
('pt-br', gettext_noop('Brazilian Portuguese')),
('ro', gettext_noop('Romanian')),
('ru', gettext_noop('Russian')),
('sk', gettext_noop('Slovak')),
('sl', gettext_noop('Slovenian')),
('sq', gettext_noop('Albanian')),
('sr', gettext_noop('Serbian')),
('sr-latn', gettext_noop('Serbian Latin')),
('sv', gettext_noop('Swedish')),
('sw', gettext_noop('Swahili')),
('ta', gettext_noop('Tamil')),
('te', gettext_noop('Telugu')),
('th', gettext_noop('Thai')),
('tr', gettext_noop('Turkish')),
('tt', gettext_noop('Tatar')),
('udm', gettext_noop('Udmurt')),
('uk', gettext_noop('Ukrainian')),
('ur', gettext_noop('Urdu')),
('uz', gettext_noop('Uzbek')),
('vi', gettext_noop('Vietnamese')),
('zh-hans', gettext_noop('Simplified Chinese')),
('zh-hant', gettext_noop('Traditional Chinese')),
]
# Languages using BiDi (right-to-left) layout
LANGUAGES_BIDI = ["he", "ar", "ar-dz", "fa", "ur"]
# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True
LOCALE_PATHS = []
# Settings for language cookie
LANGUAGE_COOKIE_NAME = 'django_language'
LANGUAGE_COOKIE_AGE = None
LANGUAGE_COOKIE_DOMAIN = None
LANGUAGE_COOKIE_PATH = '/'
LANGUAGE_COOKIE_SECURE = False
LANGUAGE_COOKIE_HTTPONLY = False
LANGUAGE_COOKIE_SAMESITE = None
# If you set this to True, Django will format dates, numbers and calendars
# according to user current locale.
USE_L10N = False
# Not-necessarily-technical managers of the site. They get broken link
# notifications and other various emails.
MANAGERS = ADMINS
# Default charset to use for all HttpResponse objects, if a MIME type isn't
# manually specified. It's used to construct the Content-Type header.
DEFAULT_CHARSET = 'utf-8'
# Email address that error messages come from.
SERVER_EMAIL = 'root@localhost'
# Database connection info. If left empty, will default to the dummy backend.
DATABASES = {}
# Classes used to implement DB routing behavior.
DATABASE_ROUTERS = []
# The email backend to use. For possible shortcuts see django.core.mail.
# The default is to use the SMTP backend.
# Third-party backends can be specified by providing a Python path
# to a module that defines an EmailBackend class.
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
# Host for sending email.
EMAIL_HOST = 'localhost'
# Port for sending email.
EMAIL_PORT = 25
# Whether to send SMTP 'Date' header in the local time zone or in UTC.
EMAIL_USE_LOCALTIME = False
# Optional SMTP authentication information for EMAIL_HOST.
EMAIL_HOST_USER = ''
EMAIL_HOST_PASSWORD = ''
EMAIL_USE_TLS = False
EMAIL_USE_SSL = False
EMAIL_SSL_CERTFILE = None
EMAIL_SSL_KEYFILE = None
EMAIL_TIMEOUT = None
# List of strings representing installed apps.
INSTALLED_APPS = []
TEMPLATES = []
# Default form rendering class.
FORM_RENDERER = 'django.forms.renderers.DjangoTemplates'
# Default email address to use for various automated correspondence from
# the site managers.
DEFAULT_FROM_EMAIL = 'webmaster@localhost'
# Subject-line prefix for email messages send with django.core.mail.mail_admins
# or ...mail_managers. Make sure to include the trailing space.
EMAIL_SUBJECT_PREFIX = '[Django] '
# Whether to append trailing slashes to URLs.
APPEND_SLASH = True
# Whether to prepend the "www." subdomain to URLs that don't have it.
PREPEND_WWW = False
# Override the server-derived value of SCRIPT_NAME
FORCE_SCRIPT_NAME = None
# List of compiled regular expression objects representing User-Agent strings
# that are not allowed to visit any page, systemwide. Use this for bad
# robots/crawlers. Here are a few examples:
# import re
# DISALLOWED_USER_AGENTS = [
# re.compile(r'^NaverBot.*'),
# re.compile(r'^EmailSiphon.*'),
# re.compile(r'^SiteSucker.*'),
# re.compile(r'^sohu-search'),
# ]
DISALLOWED_USER_AGENTS = []
ABSOLUTE_URL_OVERRIDES = {}
# List of compiled regular expression objects representing URLs that need not
# be reported by BrokenLinkEmailsMiddleware. Here are a few examples:
# import re
# IGNORABLE_404_URLS = [
# re.compile(r'^/apple-touch-icon.*\.png$'),
# re.compile(r'^/favicon.ico$'),
# re.compile(r'^/robots.txt$'),
# re.compile(r'^/phpmyadmin/'),
# re.compile(r'\.(cgi|php|pl)$'),
# ]
IGNORABLE_404_URLS = []
# A secret key for this particular Django installation. Used in secret-key
# hashing algorithms. Set this in your settings, or Django will complain
# loudly.
SECRET_KEY = ''
# Default file storage mechanism that holds media.
DEFAULT_FILE_STORAGE = 'django.core.files.storage.FileSystemStorage'
# Absolute filesystem path to the directory that will hold user-uploaded files.
# Example: "/var/www/example.com/media/"
MEDIA_ROOT = ''
# URL that handles the media served from MEDIA_ROOT.
# Examples: "http://example.com/media/", "http://media.example.com/"
MEDIA_URL = ''
# Absolute path to the directory static files should be collected to.
# Example: "/var/www/example.com/static/"
STATIC_ROOT = None
# URL that handles the static files served from STATIC_ROOT.
# Example: "http://example.com/static/", "http://static.example.com/"
STATIC_URL = None
# List of upload handler classes to be applied in order.
FILE_UPLOAD_HANDLERS = [
'django.core.files.uploadhandler.MemoryFileUploadHandler',
'django.core.files.uploadhandler.TemporaryFileUploadHandler',
]
# Maximum size, in bytes, of a request before it will be streamed to the
# file system instead of into memory.
FILE_UPLOAD_MAX_MEMORY_SIZE = 2621440 # i.e. 2.5 MB
# Maximum size in bytes of request data (excluding file uploads) that will be
# read before a SuspiciousOperation (RequestDataTooBig) is raised.
DATA_UPLOAD_MAX_MEMORY_SIZE = 2621440 # i.e. 2.5 MB
# Maximum number of GET/POST parameters that will be read before a
# SuspiciousOperation (TooManyFieldsSent) is raised.
DATA_UPLOAD_MAX_NUMBER_FIELDS = 1000
# Directory in which upload streamed files will be temporarily saved. A value of
# `None` will make Django use the operating system's default temporary directory
# (i.e. "/tmp" on *nix systems).
FILE_UPLOAD_TEMP_DIR = None
# The numeric mode to set newly-uploaded files to. The value should be a mode
# you'd pass directly to os.chmod; see https://docs.python.org/library/os.html#files-and-directories.
FILE_UPLOAD_PERMISSIONS = 0o644
# The numeric mode to assign to newly-created directories, when uploading files.
# The value should be a mode as you'd pass to os.chmod;
# see https://docs.python.org/library/os.html#files-and-directories.
FILE_UPLOAD_DIRECTORY_PERMISSIONS = None
# Python module path where user will place custom format definition.
# The directory where this setting is pointing should contain subdirectories
# named as the locales, containing a formats.py file
# (i.e. "myproject.locale" for myproject/locale/en/formats.py etc. use)
FORMAT_MODULE_PATH = None
# Default formatting for date objects. See all available format strings here:
# https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
DATE_FORMAT = 'N j, Y'
# Default formatting for datetime objects. See all available format strings here:
# https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
DATETIME_FORMAT = 'N j, Y, P'
# Default formatting for time objects. See all available format strings here:
# https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
TIME_FORMAT = 'P'
# Default formatting for date objects when only the year and month are relevant.
# See all available format strings here:
# https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
YEAR_MONTH_FORMAT = 'F Y'
# Default formatting for date objects when only the month and day are relevant.
# See all available format strings here:
# https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
MONTH_DAY_FORMAT = 'F j'
# Default short formatting for date objects. See all available format strings here:
# https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
SHORT_DATE_FORMAT = 'm/d/Y'
# Default short formatting for datetime objects.
# See all available format strings here:
# https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
SHORT_DATETIME_FORMAT = 'm/d/Y P'
# Default formats to be used when parsing dates from input boxes, in order
# See all available format string here:
# https://docs.python.org/library/datetime.html#strftime-behavior
# * Note that these format strings are different from the ones to display dates
DATE_INPUT_FORMATS = [
'%Y-%m-%d', '%m/%d/%Y', '%m/%d/%y', # '2006-10-25', '10/25/2006', '10/25/06'
'%b %d %Y', '%b %d, %Y', # 'Oct 25 2006', 'Oct 25, 2006'
'%d %b %Y', '%d %b, %Y', # '25 Oct 2006', '25 Oct, 2006'
'%B %d %Y', '%B %d, %Y', # 'October 25 2006', 'October 25, 2006'
'%d %B %Y', '%d %B, %Y', # '25 October 2006', '25 October, 2006'
]
# Default formats to be used when parsing times from input boxes, in order
# See all available format string here:
# https://docs.python.org/library/datetime.html#strftime-behavior
# * Note that these format strings are different from the ones to display dates
TIME_INPUT_FORMATS = [
'%H:%M:%S', # '14:30:59'
'%H:%M:%S.%f', # '14:30:59.000200'
'%H:%M', # '14:30'
]
# Default formats to be used when parsing dates and times from input boxes,
# in order
# See all available format string here:
# https://docs.python.org/library/datetime.html#strftime-behavior
# * Note that these format strings are different from the ones to display dates
DATETIME_INPUT_FORMATS = [
'%Y-%m-%d %H:%M:%S', # '2006-10-25 14:30:59'
'%Y-%m-%d %H:%M:%S.%f', # '2006-10-25 14:30:59.000200'
'%Y-%m-%d %H:%M', # '2006-10-25 14:30'
'%m/%d/%Y %H:%M:%S', # '10/25/2006 14:30:59'
'%m/%d/%Y %H:%M:%S.%f', # '10/25/2006 14:30:59.000200'
'%m/%d/%Y %H:%M', # '10/25/2006 14:30'
'%m/%d/%y %H:%M:%S', # '10/25/06 14:30:59'
'%m/%d/%y %H:%M:%S.%f', # '10/25/06 14:30:59.000200'
'%m/%d/%y %H:%M', # '10/25/06 14:30'
]
# First day of week, to be used on calendars
# 0 means Sunday, 1 means Monday...
FIRST_DAY_OF_WEEK = 0
# Decimal separator symbol
DECIMAL_SEPARATOR = '.'
# Boolean that sets whether to add thousand separator when formatting numbers
USE_THOUSAND_SEPARATOR = False
# Number of digits that will be together, when splitting them by
# THOUSAND_SEPARATOR. 0 means no grouping, 3 means splitting by thousands...
NUMBER_GROUPING = 0
# Thousand separator symbol
THOUSAND_SEPARATOR = ','
# The tablespaces to use for each model when not specified otherwise.
DEFAULT_TABLESPACE = ''
DEFAULT_INDEX_TABLESPACE = ''
# Default X-Frame-Options header value
X_FRAME_OPTIONS = 'DENY'
USE_X_FORWARDED_HOST = False
USE_X_FORWARDED_PORT = False
# The Python dotted path to the WSGI application that Django's internal server
# (runserver) will use. If `None`, the return value of
# 'django.core.wsgi.get_wsgi_application' is used, thus preserving the same
# behavior as previous versions of Django. Otherwise this should point to an
# actual WSGI application object.
WSGI_APPLICATION = None
# If your Django app is behind a proxy that sets a header to specify secure
# connections, AND that proxy ensures that user-submitted headers with the
# same name are ignored (so that people can't spoof it), set this value to
# a tuple of (header_name, header_value). For any requests that come in with
# that header/value, request.is_secure() will return True.
# WARNING! Only set this if you fully understand what you're doing. Otherwise,
# you may be opening yourself up to a security risk.
SECURE_PROXY_SSL_HEADER = None
##############
# MIDDLEWARE #
##############
# List of middleware to use. Order is important; in the request phase, these
# middleware will be applied in the order given, and in the response
# phase the middleware will be applied in reverse order.
MIDDLEWARE = []
############
# SESSIONS #
############
# Cache to store session data if using the cache session backend.
SESSION_CACHE_ALIAS = 'default'
# Cookie name. This can be whatever you want.
SESSION_COOKIE_NAME = 'sessionid'
# Age of cookie, in seconds (default: 2 weeks).
SESSION_COOKIE_AGE = 60 * 60 * 24 * 7 * 2
# A string like "example.com", or None for standard domain cookie.
SESSION_COOKIE_DOMAIN = None
# Whether the session cookie should be secure (https:// only).
SESSION_COOKIE_SECURE = False
# The path of the session cookie.
SESSION_COOKIE_PATH = '/'
# Whether to use the HttpOnly flag.
SESSION_COOKIE_HTTPONLY = True
# Whether to set the flag restricting cookie leaks on cross-site requests.
# This can be 'Lax', 'Strict', or None to disable the flag.
SESSION_COOKIE_SAMESITE = 'Lax'
# Whether to save the session data on every request.
SESSION_SAVE_EVERY_REQUEST = False
# Whether a user's session cookie expires when the Web browser is closed.
SESSION_EXPIRE_AT_BROWSER_CLOSE = False
# The module to store session data
SESSION_ENGINE = 'django.contrib.sessions.backends.db'
# Directory to store session files if using the file session module. If None,
# the backend will use a sensible default.
SESSION_FILE_PATH = None
# class to serialize session data
SESSION_SERIALIZER = 'django.contrib.sessions.serializers.JSONSerializer'
#########
# CACHE #
#########
# The cache backends to use.
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
}
}
CACHE_MIDDLEWARE_KEY_PREFIX = ''
CACHE_MIDDLEWARE_SECONDS = 600
CACHE_MIDDLEWARE_ALIAS = 'default'
##################
# AUTHENTICATION #
##################
AUTH_USER_MODEL = 'auth.User'
AUTHENTICATION_BACKENDS = ['django.contrib.auth.backends.ModelBackend']
LOGIN_URL = '/accounts/login/'
LOGIN_REDIRECT_URL = '/accounts/profile/'
LOGOUT_REDIRECT_URL = None
# The number of days a password reset link is valid for
PASSWORD_RESET_TIMEOUT_DAYS = 3
# The minimum number of seconds a password reset link is valid for
# (default: 3 days).
PASSWORD_RESET_TIMEOUT = 60 * 60 * 24 * 3
# the first hasher in this list is the preferred algorithm. any
# password using different algorithms will be converted automatically
# upon login
PASSWORD_HASHERS = [
'django.contrib.auth.hashers.PBKDF2PasswordHasher',
'django.contrib.auth.hashers.PBKDF2SHA1PasswordHasher',
'django.contrib.auth.hashers.Argon2PasswordHasher',
'django.contrib.auth.hashers.BCryptSHA256PasswordHasher',
]
AUTH_PASSWORD_VALIDATORS = []
###########
# SIGNING #
###########
SIGNING_BACKEND = 'django.core.signing.TimestampSigner'
########
# CSRF #
########
# Dotted path to callable to be used as view when a request is
# rejected by the CSRF middleware.
CSRF_FAILURE_VIEW = 'django.views.csrf.csrf_failure'
# Settings for CSRF cookie.
CSRF_COOKIE_NAME = 'csrftoken'
CSRF_COOKIE_AGE = 60 * 60 * 24 * 7 * 52
CSRF_COOKIE_DOMAIN = None
CSRF_COOKIE_PATH = '/'
CSRF_COOKIE_SECURE = False
CSRF_COOKIE_HTTPONLY = False
CSRF_COOKIE_SAMESITE = 'Lax'
CSRF_HEADER_NAME = 'HTTP_X_CSRFTOKEN'
CSRF_TRUSTED_ORIGINS = []
CSRF_USE_SESSIONS = False
############
# MESSAGES #
############
# Class to use as messages backend
MESSAGE_STORAGE = 'django.contrib.messages.storage.fallback.FallbackStorage'
# Default values of MESSAGE_LEVEL and MESSAGE_TAGS are defined within
# django.contrib.messages to avoid imports in this settings file.
###########
# LOGGING #
###########
# The callable to use to configure logging
LOGGING_CONFIG = 'logging.config.dictConfig'
# Custom logging configuration.
LOGGING = {}
# Default exception reporter class used in case none has been
# specifically assigned to the HttpRequest instance.
DEFAULT_EXCEPTION_REPORTER = 'django.views.debug.ExceptionReporter'
# Default exception reporter filter class used in case none has been
# specifically assigned to the HttpRequest instance.
DEFAULT_EXCEPTION_REPORTER_FILTER = 'django.views.debug.SafeExceptionReporterFilter'
###########
# TESTING #
###########
# The name of the class to use to run the test suite
TEST_RUNNER = 'django.test.runner.DiscoverRunner'
# Apps that don't need to be serialized at test database creation time
# (only apps with migrations are to start with)
TEST_NON_SERIALIZED_APPS = []
############
# FIXTURES #
############
# The list of directories to search for fixtures
FIXTURE_DIRS = []
###############
# STATICFILES #
###############
# A list of locations of additional static files
STATICFILES_DIRS = []
# The default file storage backend used during the build process
STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.StaticFilesStorage'
# List of finder classes that know how to find static files in
# various locations.
STATICFILES_FINDERS = [
'django.contrib.staticfiles.finders.FileSystemFinder',
'django.contrib.staticfiles.finders.AppDirectoriesFinder',
# 'django.contrib.staticfiles.finders.DefaultStorageFinder',
]
##############
# MIGRATIONS #
##############
# Migration module overrides for apps, by app label.
MIGRATION_MODULES = {}
#################
# SYSTEM CHECKS #
#################
# List of all issues generated by system checks that should be silenced. Light
# issues like warnings, infos or debugs will not generate a message. Silencing
# serious issues like errors and criticals does not result in hiding the
# message, but Django will not stop you from e.g. running server.
SILENCED_SYSTEM_CHECKS = []
#######################
# SECURITY MIDDLEWARE #
#######################
SECURE_BROWSER_XSS_FILTER = False
SECURE_CONTENT_TYPE_NOSNIFF = True
SECURE_HSTS_INCLUDE_SUBDOMAINS = False
SECURE_HSTS_PRELOAD = False
SECURE_HSTS_SECONDS = 0
SECURE_REDIRECT_EXEMPT = []
SECURE_REFERRER_POLICY = None
SECURE_SSL_HOST = None
SECURE_SSL_REDIRECT = False
|
6b24a93e241a2c36ea1f295c69eaf28532a7ed128f432a71ca4b04e9543466bb | """
Django's standard crypto functions and utilities.
"""
import hashlib
import hmac
import secrets
from django.conf import settings
from django.utils.encoding import force_bytes
class InvalidAlgorithm(ValueError):
"""Algorithm is not supported by hashlib."""
pass
def salted_hmac(key_salt, value, secret=None, *, algorithm='sha1'):
"""
Return the HMAC of 'value', using a key generated from key_salt and a
secret (which defaults to settings.SECRET_KEY). Default algorithm is SHA1,
but any algorithm name supported by hashlib.new() can be passed.
A different key_salt should be passed in for every application of HMAC.
"""
if secret is None:
secret = settings.SECRET_KEY
key_salt = force_bytes(key_salt)
secret = force_bytes(secret)
try:
hasher = getattr(hashlib, algorithm)
except AttributeError as e:
raise InvalidAlgorithm(
'%r is not an algorithm accepted by the hashlib module.'
% algorithm
) from e
# We need to generate a derived key from our base key. We can do this by
# passing the key_salt and our base key through a pseudo-random function.
key = hasher(key_salt + secret).digest()
# If len(key_salt + secret) > block size of the hash algorithm, the above
# line is redundant and could be replaced by key = key_salt + secret, since
# the hmac module does the same thing for keys longer than the block size.
# However, we need to ensure that we *always* do this.
return hmac.new(key, msg=force_bytes(value), digestmod=hasher)
def get_random_string(length=12,
allowed_chars='abcdefghijklmnopqrstuvwxyz'
'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'):
"""
Return a securely generated random string.
The default length of 12 with the a-z, A-Z, 0-9 character set returns
a 71-bit value. log_2((26+26+10)^12) =~ 71 bits
"""
return ''.join(secrets.choice(allowed_chars) for i in range(length))
def constant_time_compare(val1, val2):
"""Return True if the two strings are equal, False otherwise."""
return secrets.compare_digest(force_bytes(val1), force_bytes(val2))
def pbkdf2(password, salt, iterations, dklen=0, digest=None):
"""Return the hash of password using pbkdf2."""
if digest is None:
digest = hashlib.sha256
dklen = dklen or None
password = force_bytes(password)
salt = force_bytes(salt)
return hashlib.pbkdf2_hmac(digest().name, password, salt, iterations, dklen)
|
2cb6e5be6a8722d5b5937f20ab106c14614e66ec61fc7d8c02b4377ed4cf8e10 | import logging
import logging.config # needed when logging_config doesn't start with logging.config
from copy import copy
from django.conf import settings
from django.core import mail
from django.core.mail import get_connection
from django.core.management.color import color_style
from django.utils.module_loading import import_string
request_logger = logging.getLogger('django.request')
# Default logging for Django. This sends an email to the site admins on every
# HTTP 500 error. Depending on DEBUG, all other log records are either sent to
# the console (DEBUG=True) or discarded (DEBUG=False) by means of the
# require_debug_true filter.
DEFAULT_LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'filters': {
'require_debug_false': {
'()': 'django.utils.log.RequireDebugFalse',
},
'require_debug_true': {
'()': 'django.utils.log.RequireDebugTrue',
},
},
'formatters': {
'django.server': {
'()': 'django.utils.log.ServerFormatter',
'format': '[{server_time}] {message}',
'style': '{',
}
},
'handlers': {
'console': {
'level': 'INFO',
'filters': ['require_debug_true'],
'class': 'logging.StreamHandler',
},
'django.server': {
'level': 'INFO',
'class': 'logging.StreamHandler',
'formatter': 'django.server',
},
'mail_admins': {
'level': 'ERROR',
'filters': ['require_debug_false'],
'class': 'django.utils.log.AdminEmailHandler'
}
},
'loggers': {
'django': {
'handlers': ['console', 'mail_admins'],
'level': 'INFO',
},
'django.server': {
'handlers': ['django.server'],
'level': 'INFO',
'propagate': False,
},
}
}
def configure_logging(logging_config, logging_settings):
if logging_config:
# First find the logging configuration function ...
logging_config_func = import_string(logging_config)
logging.config.dictConfig(DEFAULT_LOGGING)
# ... then invoke it with the logging settings
if logging_settings:
logging_config_func(logging_settings)
class AdminEmailHandler(logging.Handler):
"""An exception log handler that emails log entries to site admins.
If the request is passed as the first argument to the log record,
request data will be provided in the email report.
"""
def __init__(self, include_html=False, email_backend=None, reporter_class=None):
super().__init__()
self.include_html = include_html
self.email_backend = email_backend
self.reporter_class = import_string(reporter_class or settings.DEFAULT_EXCEPTION_REPORTER)
def emit(self, record):
try:
request = record.request
subject = '%s (%s IP): %s' % (
record.levelname,
('internal' if request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS
else 'EXTERNAL'),
record.getMessage()
)
except Exception:
subject = '%s: %s' % (
record.levelname,
record.getMessage()
)
request = None
subject = self.format_subject(subject)
# Since we add a nicely formatted traceback on our own, create a copy
# of the log record without the exception data.
no_exc_record = copy(record)
no_exc_record.exc_info = None
no_exc_record.exc_text = None
if record.exc_info:
exc_info = record.exc_info
else:
exc_info = (None, record.getMessage(), None)
reporter = self.reporter_class(request, is_email=True, *exc_info)
message = "%s\n\n%s" % (self.format(no_exc_record), reporter.get_traceback_text())
html_message = reporter.get_traceback_html() if self.include_html else None
self.send_mail(subject, message, fail_silently=True, html_message=html_message)
def send_mail(self, subject, message, *args, **kwargs):
mail.mail_admins(subject, message, *args, connection=self.connection(), **kwargs)
def connection(self):
return get_connection(backend=self.email_backend, fail_silently=True)
def format_subject(self, subject):
"""
Escape CR and LF characters.
"""
return subject.replace('\n', '\\n').replace('\r', '\\r')
class CallbackFilter(logging.Filter):
"""
A logging filter that checks the return value of a given callable (which
takes the record-to-be-logged as its only parameter) to decide whether to
log a record.
"""
def __init__(self, callback):
self.callback = callback
def filter(self, record):
if self.callback(record):
return 1
return 0
class RequireDebugFalse(logging.Filter):
def filter(self, record):
return not settings.DEBUG
class RequireDebugTrue(logging.Filter):
def filter(self, record):
return settings.DEBUG
class ServerFormatter(logging.Formatter):
def __init__(self, *args, **kwargs):
self.style = color_style()
super().__init__(*args, **kwargs)
def format(self, record):
msg = record.msg
status_code = getattr(record, 'status_code', None)
if status_code:
if 200 <= status_code < 300:
# Put 2XX first, since it should be the common case
msg = self.style.HTTP_SUCCESS(msg)
elif 100 <= status_code < 200:
msg = self.style.HTTP_INFO(msg)
elif status_code == 304:
msg = self.style.HTTP_NOT_MODIFIED(msg)
elif 300 <= status_code < 400:
msg = self.style.HTTP_REDIRECT(msg)
elif status_code == 404:
msg = self.style.HTTP_NOT_FOUND(msg)
elif 400 <= status_code < 500:
msg = self.style.HTTP_BAD_REQUEST(msg)
else:
# Any 5XX, or any other status code
msg = self.style.HTTP_SERVER_ERROR(msg)
if self.uses_server_time() and not hasattr(record, 'server_time'):
record.server_time = self.formatTime(record, self.datefmt)
record.msg = msg
return super().format(record)
def uses_server_time(self):
return self._fmt.find('{server_time}') >= 0
def log_response(message, *args, response=None, request=None, logger=request_logger, level=None, exc_info=None):
"""
Log errors based on HttpResponse status.
Log 5xx responses as errors and 4xx responses as warnings (unless a level
is given as a keyword argument). The HttpResponse status_code and the
request are passed to the logger's extra parameter.
"""
# Check if the response has already been logged. Multiple requests to log
# the same response can be received in some cases, e.g., when the
# response is the result of an exception and is logged at the time the
# exception is caught so that the exc_info can be recorded.
if getattr(response, '_has_been_logged', False):
return
if level is None:
if response.status_code >= 500:
level = 'error'
elif response.status_code >= 400:
level = 'warning'
else:
level = 'info'
getattr(logger, level)(
message, *args,
extra={
'status_code': response.status_code,
'request': request,
},
exc_info=exc_info,
)
response._has_been_logged = True
|
640ffcc58a109d093e04a5f79e5f7d796c5598251fbf052cde3839f7d1fe17ae | """
Cache middleware. If enabled, each Django-powered page will be cached based on
URL. The canonical way to enable cache middleware is to set
``UpdateCacheMiddleware`` as your first piece of middleware, and
``FetchFromCacheMiddleware`` as the last::
MIDDLEWARE = [
'django.middleware.cache.UpdateCacheMiddleware',
...
'django.middleware.cache.FetchFromCacheMiddleware'
]
This is counter-intuitive, but correct: ``UpdateCacheMiddleware`` needs to run
last during the response phase, which processes middleware bottom-up;
``FetchFromCacheMiddleware`` needs to run last during the request phase, which
processes middleware top-down.
The single-class ``CacheMiddleware`` can be used for some simple sites.
However, if any other piece of middleware needs to affect the cache key, you'll
need to use the two-part ``UpdateCacheMiddleware`` and
``FetchFromCacheMiddleware``. This'll most often happen when you're using
Django's ``LocaleMiddleware``.
More details about how the caching works:
* Only GET or HEAD-requests with status code 200 are cached.
* The number of seconds each page is stored for is set by the "max-age" section
of the response's "Cache-Control" header, falling back to the
CACHE_MIDDLEWARE_SECONDS setting if the section was not found.
* This middleware expects that a HEAD request is answered with the same response
headers exactly like the corresponding GET request.
* When a hit occurs, a shallow copy of the original response object is returned
from process_request.
* Pages will be cached based on the contents of the request headers listed in
the response's "Vary" header.
* This middleware also sets ETag, Last-Modified, Expires and Cache-Control
headers on the response object.
"""
from django.conf import settings
from django.core.cache import DEFAULT_CACHE_ALIAS, caches
from django.utils.cache import (
get_cache_key, get_max_age, has_vary_header, learn_cache_key,
patch_response_headers,
)
from django.utils.deprecation import MiddlewareMixin
class UpdateCacheMiddleware(MiddlewareMixin):
"""
Response-phase cache middleware that updates the cache if the response is
cacheable.
Must be used as part of the two-part update/fetch cache middleware.
UpdateCacheMiddleware must be the first piece of middleware in MIDDLEWARE
so that it'll get called last during the response phase.
"""
def __init__(self, get_response=None):
self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
self.page_timeout = None
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
self.cache = caches[self.cache_alias]
self.get_response = get_response
def _should_update_cache(self, request, response):
return hasattr(request, '_cache_update_cache') and request._cache_update_cache
def process_response(self, request, response):
"""Set the cache, if needed."""
if not self._should_update_cache(request, response):
# We don't need to update the cache, just return.
return response
if response.streaming or response.status_code not in (200, 304):
return response
# Don't cache responses that set a user-specific (and maybe security
# sensitive) cookie in response to a cookie-less request.
if not request.COOKIES and response.cookies and has_vary_header(response, 'Cookie'):
return response
# Don't cache a response with 'Cache-Control: private'
if 'private' in response.get('Cache-Control', ()):
return response
# Page timeout takes precedence over the "max-age" and the default
# cache timeout.
timeout = self.page_timeout
if timeout is None:
# The timeout from the "max-age" section of the "Cache-Control"
# header takes precedence over the default cache timeout.
timeout = get_max_age(response)
if timeout is None:
timeout = self.cache_timeout
elif timeout == 0:
# max-age was set to 0, don't cache.
return response
patch_response_headers(response, timeout)
if timeout and response.status_code == 200:
cache_key = learn_cache_key(request, response, timeout, self.key_prefix, cache=self.cache)
if hasattr(response, 'render') and callable(response.render):
response.add_post_render_callback(
lambda r: self.cache.set(cache_key, r, timeout)
)
else:
self.cache.set(cache_key, response, timeout)
return response
class FetchFromCacheMiddleware(MiddlewareMixin):
"""
Request-phase cache middleware that fetches a page from the cache.
Must be used as part of the two-part update/fetch cache middleware.
FetchFromCacheMiddleware must be the last piece of middleware in MIDDLEWARE
so that it'll get called last during the request phase.
"""
def __init__(self, get_response=None):
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
self.cache = caches[self.cache_alias]
self.get_response = get_response
def process_request(self, request):
"""
Check whether the page is already cached and return the cached
version if available.
"""
if request.method not in ('GET', 'HEAD'):
request._cache_update_cache = False
return None # Don't bother checking the cache.
# try and get the cached GET response
cache_key = get_cache_key(request, self.key_prefix, 'GET', cache=self.cache)
if cache_key is None:
request._cache_update_cache = True
return None # No cache information available, need to rebuild.
response = self.cache.get(cache_key)
# if it wasn't found and we are looking for a HEAD, try looking just for that
if response is None and request.method == 'HEAD':
cache_key = get_cache_key(request, self.key_prefix, 'HEAD', cache=self.cache)
response = self.cache.get(cache_key)
if response is None:
request._cache_update_cache = True
return None # No cache information available, need to rebuild.
# hit, return cached response
request._cache_update_cache = False
return response
class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
"""
Cache middleware that provides basic behavior for many simple sites.
Also used as the hook point for the cache decorator, which is generated
using the decorator-from-middleware utility.
"""
def __init__(self, get_response=None, cache_timeout=None, page_timeout=None, **kwargs):
self.get_response = get_response
# We need to differentiate between "provided, but using default value",
# and "not provided". If the value is provided using a default, then
# we fall back to system defaults. If it is not provided at all,
# we need to use middleware defaults.
try:
key_prefix = kwargs['key_prefix']
if key_prefix is None:
key_prefix = ''
except KeyError:
key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.key_prefix = key_prefix
try:
cache_alias = kwargs['cache_alias']
if cache_alias is None:
cache_alias = DEFAULT_CACHE_ALIAS
except KeyError:
cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
self.cache_alias = cache_alias
if cache_timeout is None:
cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
self.cache_timeout = cache_timeout
self.page_timeout = page_timeout
self.cache = caches[self.cache_alias]
|
aee95948cea4df4e4f9f002f9b4b9aaafcd785e41af30bf45ca23eaf2c2f0d38 | """
This module converts requested URLs to callback view functions.
URLResolver is the main class here. Its resolve() method takes a URL (as
a string) and returns a ResolverMatch object which provides access to all
attributes of the resolved URL match.
"""
import functools
import inspect
import re
import string
from importlib import import_module
from urllib.parse import quote
from asgiref.local import Local
from django.conf import settings
from django.core.checks import Error, Warning
from django.core.checks.urls import check_resolver
from django.core.exceptions import ImproperlyConfigured, ViewDoesNotExist
from django.utils.datastructures import MultiValueDict
from django.utils.functional import cached_property
from django.utils.http import RFC3986_SUBDELIMS, escape_leading_slashes
from django.utils.regex_helper import _lazy_re_compile, normalize
from django.utils.translation import get_language
from .converters import get_converter
from .exceptions import NoReverseMatch, Resolver404
from .utils import get_callable
class ResolverMatch:
def __init__(self, func, args, kwargs, url_name=None, app_names=None, namespaces=None, route=None):
self.func = func
self.args = args
self.kwargs = kwargs
self.url_name = url_name
self.route = route
# If a URLRegexResolver doesn't have a namespace or app_name, it passes
# in an empty value.
self.app_names = [x for x in app_names if x] if app_names else []
self.app_name = ':'.join(self.app_names)
self.namespaces = [x for x in namespaces if x] if namespaces else []
self.namespace = ':'.join(self.namespaces)
if not hasattr(func, '__name__'):
# A class-based view
self._func_path = func.__class__.__module__ + '.' + func.__class__.__name__
else:
# A function-based view
self._func_path = func.__module__ + '.' + func.__name__
view_path = url_name or self._func_path
self.view_name = ':'.join(self.namespaces + [view_path])
def __getitem__(self, index):
return (self.func, self.args, self.kwargs)[index]
def __repr__(self):
return "ResolverMatch(func=%s, args=%s, kwargs=%s, url_name=%s, app_names=%s, namespaces=%s, route=%s)" % (
self._func_path, self.args, self.kwargs, self.url_name,
self.app_names, self.namespaces, self.route,
)
def get_resolver(urlconf=None):
if urlconf is None:
urlconf = settings.ROOT_URLCONF
return _get_cached_resolver(urlconf)
@functools.lru_cache(maxsize=None)
def _get_cached_resolver(urlconf=None):
return URLResolver(RegexPattern(r'^/'), urlconf)
@functools.lru_cache(maxsize=None)
def get_ns_resolver(ns_pattern, resolver, converters):
# Build a namespaced resolver for the given parent URLconf pattern.
# This makes it possible to have captured parameters in the parent
# URLconf pattern.
pattern = RegexPattern(ns_pattern)
pattern.converters = dict(converters)
ns_resolver = URLResolver(pattern, resolver.url_patterns)
return URLResolver(RegexPattern(r'^/'), [ns_resolver])
class LocaleRegexDescriptor:
def __init__(self, attr):
self.attr = attr
def __get__(self, instance, cls=None):
"""
Return a compiled regular expression based on the active language.
"""
if instance is None:
return self
# As a performance optimization, if the given regex string is a regular
# string (not a lazily-translated string proxy), compile it once and
# avoid per-language compilation.
pattern = getattr(instance, self.attr)
if isinstance(pattern, str):
instance.__dict__['regex'] = instance._compile(pattern)
return instance.__dict__['regex']
language_code = get_language()
if language_code not in instance._regex_dict:
instance._regex_dict[language_code] = instance._compile(str(pattern))
return instance._regex_dict[language_code]
class CheckURLMixin:
def describe(self):
"""
Format the URL pattern for display in warning messages.
"""
description = "'{}'".format(self)
if self.name:
description += " [name='{}']".format(self.name)
return description
def _check_pattern_startswith_slash(self):
"""
Check that the pattern does not begin with a forward slash.
"""
regex_pattern = self.regex.pattern
if not settings.APPEND_SLASH:
# Skip check as it can be useful to start a URL pattern with a slash
# when APPEND_SLASH=False.
return []
if regex_pattern.startswith(('/', '^/', '^\\/')) and not regex_pattern.endswith('/'):
warning = Warning(
"Your URL pattern {} has a route beginning with a '/'. Remove this "
"slash as it is unnecessary. If this pattern is targeted in an "
"include(), ensure the include() pattern has a trailing '/'.".format(
self.describe()
),
id="urls.W002",
)
return [warning]
else:
return []
class RegexPattern(CheckURLMixin):
regex = LocaleRegexDescriptor('_regex')
def __init__(self, regex, name=None, is_endpoint=False):
self._regex = regex
self._regex_dict = {}
self._is_endpoint = is_endpoint
self.name = name
self.converters = {}
def match(self, path):
match = self.regex.search(path)
if match:
# If there are any named groups, use those as kwargs, ignoring
# non-named groups. Otherwise, pass all non-named arguments as
# positional arguments.
kwargs = match.groupdict()
args = () if kwargs else match.groups()
kwargs = {k: v for k, v in kwargs.items() if v is not None}
return path[match.end():], args, kwargs
return None
def check(self):
warnings = []
warnings.extend(self._check_pattern_startswith_slash())
if not self._is_endpoint:
warnings.extend(self._check_include_trailing_dollar())
return warnings
def _check_include_trailing_dollar(self):
regex_pattern = self.regex.pattern
if regex_pattern.endswith('$') and not regex_pattern.endswith(r'\$'):
return [Warning(
"Your URL pattern {} uses include with a route ending with a '$'. "
"Remove the dollar from the route to avoid problems including "
"URLs.".format(self.describe()),
id='urls.W001',
)]
else:
return []
def _compile(self, regex):
"""Compile and return the given regular expression."""
try:
return re.compile(regex)
except re.error as e:
raise ImproperlyConfigured(
'"%s" is not a valid regular expression: %s' % (regex, e)
) from e
def __str__(self):
return str(self._regex)
_PATH_PARAMETER_COMPONENT_RE = _lazy_re_compile(
r'<(?:(?P<converter>[^>:]+):)?(?P<parameter>\w+)>'
)
def _route_to_regex(route, is_endpoint=False):
"""
Convert a path pattern into a regular expression. Return the regular
expression and a dictionary mapping the capture names to the converters.
For example, 'foo/<int:pk>' returns '^foo\\/(?P<pk>[0-9]+)'
and {'pk': <django.urls.converters.IntConverter>}.
"""
if not set(route).isdisjoint(string.whitespace):
raise ImproperlyConfigured("URL route '%s' cannot contain whitespace." % route)
original_route = route
parts = ['^']
converters = {}
while True:
match = _PATH_PARAMETER_COMPONENT_RE.search(route)
if not match:
parts.append(re.escape(route))
break
parts.append(re.escape(route[:match.start()]))
route = route[match.end():]
parameter = match.group('parameter')
if not parameter.isidentifier():
raise ImproperlyConfigured(
"URL route '%s' uses parameter name %r which isn't a valid "
"Python identifier." % (original_route, parameter)
)
raw_converter = match.group('converter')
if raw_converter is None:
# If a converter isn't specified, the default is `str`.
raw_converter = 'str'
try:
converter = get_converter(raw_converter)
except KeyError as e:
raise ImproperlyConfigured(
'URL route %r uses invalid converter %r.'
% (original_route, raw_converter)
) from e
converters[parameter] = converter
parts.append('(?P<' + parameter + '>' + converter.regex + ')')
if is_endpoint:
parts.append('$')
return ''.join(parts), converters
class RoutePattern(CheckURLMixin):
regex = LocaleRegexDescriptor('_route')
def __init__(self, route, name=None, is_endpoint=False):
self._route = route
self._regex_dict = {}
self._is_endpoint = is_endpoint
self.name = name
self.converters = _route_to_regex(str(route), is_endpoint)[1]
def match(self, path):
match = self.regex.search(path)
if match:
# RoutePattern doesn't allow non-named groups so args are ignored.
kwargs = match.groupdict()
for key, value in kwargs.items():
converter = self.converters[key]
try:
kwargs[key] = converter.to_python(value)
except ValueError:
return None
return path[match.end():], (), kwargs
return None
def check(self):
warnings = self._check_pattern_startswith_slash()
route = self._route
if '(?P<' in route or route.startswith('^') or route.endswith('$'):
warnings.append(Warning(
"Your URL pattern {} has a route that contains '(?P<', begins "
"with a '^', or ends with a '$'. This was likely an oversight "
"when migrating to django.urls.path().".format(self.describe()),
id='2_0.W001',
))
return warnings
def _compile(self, route):
return re.compile(_route_to_regex(route, self._is_endpoint)[0])
def __str__(self):
return str(self._route)
class LocalePrefixPattern:
def __init__(self, prefix_default_language=True):
self.prefix_default_language = prefix_default_language
self.converters = {}
@property
def regex(self):
# This is only used by reverse() and cached in _reverse_dict.
return re.compile(self.language_prefix)
@property
def language_prefix(self):
language_code = get_language() or settings.LANGUAGE_CODE
if language_code == settings.LANGUAGE_CODE and not self.prefix_default_language:
return ''
else:
return '%s/' % language_code
def match(self, path):
language_prefix = self.language_prefix
if path.startswith(language_prefix):
return path[len(language_prefix):], (), {}
return None
def check(self):
return []
def describe(self):
return "'{}'".format(self)
def __str__(self):
return self.language_prefix
class URLPattern:
def __init__(self, pattern, callback, default_args=None, name=None):
self.pattern = pattern
self.callback = callback # the view
self.default_args = default_args or {}
self.name = name
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.pattern.describe())
def check(self):
warnings = self._check_pattern_name()
warnings.extend(self.pattern.check())
return warnings
def _check_pattern_name(self):
"""
Check that the pattern name does not contain a colon.
"""
if self.pattern.name is not None and ":" in self.pattern.name:
warning = Warning(
"Your URL pattern {} has a name including a ':'. Remove the colon, to "
"avoid ambiguous namespace references.".format(self.pattern.describe()),
id="urls.W003",
)
return [warning]
else:
return []
def resolve(self, path):
match = self.pattern.match(path)
if match:
new_path, args, kwargs = match
# Pass any extra_kwargs as **kwargs.
kwargs.update(self.default_args)
return ResolverMatch(self.callback, args, kwargs, self.pattern.name, route=str(self.pattern))
@cached_property
def lookup_str(self):
"""
A string that identifies the view (e.g. 'path.to.view_function' or
'path.to.ClassBasedView').
"""
callback = self.callback
if isinstance(callback, functools.partial):
callback = callback.func
if not hasattr(callback, '__name__'):
return callback.__module__ + "." + callback.__class__.__name__
return callback.__module__ + "." + callback.__qualname__
class URLResolver:
def __init__(self, pattern, urlconf_name, default_kwargs=None, app_name=None, namespace=None):
self.pattern = pattern
# urlconf_name is the dotted Python path to the module defining
# urlpatterns. It may also be an object with an urlpatterns attribute
# or urlpatterns itself.
self.urlconf_name = urlconf_name
self.callback = None
self.default_kwargs = default_kwargs or {}
self.namespace = namespace
self.app_name = app_name
self._reverse_dict = {}
self._namespace_dict = {}
self._app_dict = {}
# set of dotted paths to all functions and classes that are used in
# urlpatterns
self._callback_strs = set()
self._populated = False
self._local = Local()
def __repr__(self):
if isinstance(self.urlconf_name, list) and self.urlconf_name:
# Don't bother to output the whole list, it can be huge
urlconf_repr = '<%s list>' % self.urlconf_name[0].__class__.__name__
else:
urlconf_repr = repr(self.urlconf_name)
return '<%s %s (%s:%s) %s>' % (
self.__class__.__name__, urlconf_repr, self.app_name,
self.namespace, self.pattern.describe(),
)
def check(self):
messages = []
for pattern in self.url_patterns:
messages.extend(check_resolver(pattern))
messages.extend(self._check_custom_error_handlers())
return messages or self.pattern.check()
def _check_custom_error_handlers(self):
messages = []
# All handlers take (request, exception) arguments except handler500
# which takes (request).
for status_code, num_parameters in [(400, 2), (403, 2), (404, 2), (500, 1)]:
try:
handler, param_dict = self.resolve_error_handler(status_code)
except (ImportError, ViewDoesNotExist) as e:
path = getattr(self.urlconf_module, 'handler%s' % status_code)
msg = (
"The custom handler{status_code} view '{path}' could not be imported."
).format(status_code=status_code, path=path)
messages.append(Error(msg, hint=str(e), id='urls.E008'))
continue
signature = inspect.signature(handler)
args = [None] * num_parameters
try:
signature.bind(*args)
except TypeError:
msg = (
"The custom handler{status_code} view '{path}' does not "
"take the correct number of arguments ({args})."
).format(
status_code=status_code,
path=handler.__module__ + '.' + handler.__qualname__,
args='request, exception' if num_parameters == 2 else 'request',
)
messages.append(Error(msg, id='urls.E007'))
return messages
def _populate(self):
# Short-circuit if called recursively in this thread to prevent
# infinite recursion. Concurrent threads may call this at the same
# time and will need to continue, so set 'populating' on a
# thread-local variable.
if getattr(self._local, 'populating', False):
return
try:
self._local.populating = True
lookups = MultiValueDict()
namespaces = {}
apps = {}
language_code = get_language()
for url_pattern in reversed(self.url_patterns):
p_pattern = url_pattern.pattern.regex.pattern
if p_pattern.startswith('^'):
p_pattern = p_pattern[1:]
if isinstance(url_pattern, URLPattern):
self._callback_strs.add(url_pattern.lookup_str)
bits = normalize(url_pattern.pattern.regex.pattern)
lookups.appendlist(
url_pattern.callback,
(bits, p_pattern, url_pattern.default_args, url_pattern.pattern.converters)
)
if url_pattern.name is not None:
lookups.appendlist(
url_pattern.name,
(bits, p_pattern, url_pattern.default_args, url_pattern.pattern.converters)
)
else: # url_pattern is a URLResolver.
url_pattern._populate()
if url_pattern.app_name:
apps.setdefault(url_pattern.app_name, []).append(url_pattern.namespace)
namespaces[url_pattern.namespace] = (p_pattern, url_pattern)
else:
for name in url_pattern.reverse_dict:
for matches, pat, defaults, converters in url_pattern.reverse_dict.getlist(name):
new_matches = normalize(p_pattern + pat)
lookups.appendlist(
name,
(
new_matches,
p_pattern + pat,
{**defaults, **url_pattern.default_kwargs},
{**self.pattern.converters, **url_pattern.pattern.converters, **converters}
)
)
for namespace, (prefix, sub_pattern) in url_pattern.namespace_dict.items():
current_converters = url_pattern.pattern.converters
sub_pattern.pattern.converters.update(current_converters)
namespaces[namespace] = (p_pattern + prefix, sub_pattern)
for app_name, namespace_list in url_pattern.app_dict.items():
apps.setdefault(app_name, []).extend(namespace_list)
self._callback_strs.update(url_pattern._callback_strs)
self._namespace_dict[language_code] = namespaces
self._app_dict[language_code] = apps
self._reverse_dict[language_code] = lookups
self._populated = True
finally:
self._local.populating = False
@property
def reverse_dict(self):
language_code = get_language()
if language_code not in self._reverse_dict:
self._populate()
return self._reverse_dict[language_code]
@property
def namespace_dict(self):
language_code = get_language()
if language_code not in self._namespace_dict:
self._populate()
return self._namespace_dict[language_code]
@property
def app_dict(self):
language_code = get_language()
if language_code not in self._app_dict:
self._populate()
return self._app_dict[language_code]
@staticmethod
def _join_route(route1, route2):
"""Join two routes, without the starting ^ in the second route."""
if not route1:
return route2
if route2.startswith('^'):
route2 = route2[1:]
return route1 + route2
def _is_callback(self, name):
if not self._populated:
self._populate()
return name in self._callback_strs
def resolve(self, path):
path = str(path) # path may be a reverse_lazy object
tried = []
match = self.pattern.match(path)
if match:
new_path, args, kwargs = match
for pattern in self.url_patterns:
try:
sub_match = pattern.resolve(new_path)
except Resolver404 as e:
sub_tried = e.args[0].get('tried')
if sub_tried is not None:
tried.extend([pattern] + t for t in sub_tried)
else:
tried.append([pattern])
else:
if sub_match:
# Merge captured arguments in match with submatch
sub_match_dict = {**kwargs, **self.default_kwargs}
# Update the sub_match_dict with the kwargs from the sub_match.
sub_match_dict.update(sub_match.kwargs)
# If there are *any* named groups, ignore all non-named groups.
# Otherwise, pass all non-named arguments as positional arguments.
sub_match_args = sub_match.args
if not sub_match_dict:
sub_match_args = args + sub_match.args
current_route = '' if isinstance(pattern, URLPattern) else str(pattern.pattern)
return ResolverMatch(
sub_match.func,
sub_match_args,
sub_match_dict,
sub_match.url_name,
[self.app_name] + sub_match.app_names,
[self.namespace] + sub_match.namespaces,
self._join_route(current_route, sub_match.route),
)
tried.append([pattern])
raise Resolver404({'tried': tried, 'path': new_path})
raise Resolver404({'path': path})
@cached_property
def urlconf_module(self):
if isinstance(self.urlconf_name, str):
return import_module(self.urlconf_name)
else:
return self.urlconf_name
@cached_property
def url_patterns(self):
# urlconf_module might be a valid set of patterns, so we default to it
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
try:
iter(patterns)
except TypeError as e:
msg = (
"The included URLconf '{name}' does not appear to have any "
"patterns in it. If you see valid patterns in the file then "
"the issue is probably caused by a circular import."
)
raise ImproperlyConfigured(msg.format(name=self.urlconf_name)) from e
return patterns
def resolve_error_handler(self, view_type):
callback = getattr(self.urlconf_module, 'handler%s' % view_type, None)
if not callback:
# No handler specified in file; use lazy import, since
# django.conf.urls imports this file.
from django.conf import urls
callback = getattr(urls, 'handler%s' % view_type)
return get_callable(callback), {}
def reverse(self, lookup_view, *args, **kwargs):
return self._reverse_with_prefix(lookup_view, '', *args, **kwargs)
def _reverse_with_prefix(self, lookup_view, _prefix, *args, **kwargs):
if args and kwargs:
raise ValueError("Don't mix *args and **kwargs in call to reverse()!")
if not self._populated:
self._populate()
possibilities = self.reverse_dict.getlist(lookup_view)
for possibility, pattern, defaults, converters in possibilities:
for result, params in possibility:
if args:
if len(args) != len(params):
continue
candidate_subs = dict(zip(params, args))
else:
if set(kwargs).symmetric_difference(params).difference(defaults):
continue
if any(kwargs.get(k, v) != v for k, v in defaults.items()):
continue
candidate_subs = kwargs
# Convert the candidate subs to text using Converter.to_url().
text_candidate_subs = {}
match = True
for k, v in candidate_subs.items():
if k in converters:
try:
text_candidate_subs[k] = converters[k].to_url(v)
except ValueError:
match = False
break
else:
text_candidate_subs[k] = str(v)
if not match:
continue
# WSGI provides decoded URLs, without %xx escapes, and the URL
# resolver operates on such URLs. First substitute arguments
# without quoting to build a decoded URL and look for a match.
# Then, if we have a match, redo the substitution with quoted
# arguments in order to return a properly encoded URL.
candidate_pat = _prefix.replace('%', '%%') + result
if re.search('^%s%s' % (re.escape(_prefix), pattern), candidate_pat % text_candidate_subs):
# safe characters from `pchar` definition of RFC 3986
url = quote(candidate_pat % text_candidate_subs, safe=RFC3986_SUBDELIMS + '/~:@')
# Don't allow construction of scheme relative urls.
return escape_leading_slashes(url)
# lookup_view can be URL name or callable, but callables are not
# friendly in error messages.
m = getattr(lookup_view, '__module__', None)
n = getattr(lookup_view, '__name__', None)
if m is not None and n is not None:
lookup_view_s = "%s.%s" % (m, n)
else:
lookup_view_s = lookup_view
patterns = [pattern for (_, pattern, _, _) in possibilities]
if patterns:
if args:
arg_msg = "arguments '%s'" % (args,)
elif kwargs:
arg_msg = "keyword arguments '%s'" % (kwargs,)
else:
arg_msg = "no arguments"
msg = (
"Reverse for '%s' with %s not found. %d pattern(s) tried: %s" %
(lookup_view_s, arg_msg, len(patterns), patterns)
)
else:
msg = (
"Reverse for '%(view)s' not found. '%(view)s' is not "
"a valid view function or pattern name." % {'view': lookup_view_s}
)
raise NoReverseMatch(msg)
|
48271e76e1816ba6d648179b9b380b4fcd8b10218c5d3aad8c93f5c694fbe922 | """
Helper functions for creating Form classes from Django models
and database field objects.
"""
from itertools import chain
from django.core.exceptions import (
NON_FIELD_ERRORS, FieldError, ImproperlyConfigured, ValidationError,
)
from django.forms.fields import ChoiceField, Field
from django.forms.forms import BaseForm, DeclarativeFieldsMetaclass
from django.forms.formsets import BaseFormSet, formset_factory
from django.forms.utils import ErrorList
from django.forms.widgets import (
HiddenInput, MultipleHiddenInput, SelectMultiple,
)
from django.utils.text import capfirst, get_text_list
from django.utils.translation import gettext, gettext_lazy as _
__all__ = (
'ModelForm', 'BaseModelForm', 'model_to_dict', 'fields_for_model',
'ModelChoiceField', 'ModelMultipleChoiceField', 'ALL_FIELDS',
'BaseModelFormSet', 'modelformset_factory', 'BaseInlineFormSet',
'inlineformset_factory', 'modelform_factory',
)
ALL_FIELDS = '__all__'
def construct_instance(form, instance, fields=None, exclude=None):
"""
Construct and return a model instance from the bound ``form``'s
``cleaned_data``, but do not save the returned instance to the database.
"""
from django.db import models
opts = instance._meta
cleaned_data = form.cleaned_data
file_field_list = []
for f in opts.fields:
if not f.editable or isinstance(f, models.AutoField) \
or f.name not in cleaned_data:
continue
if fields is not None and f.name not in fields:
continue
if exclude and f.name in exclude:
continue
# Leave defaults for fields that aren't in POST data, except for
# checkbox inputs because they don't appear in POST data if not checked.
if (
f.has_default() and
form[f.name].field.widget.value_omitted_from_data(form.data, form.files, form.add_prefix(f.name)) and
cleaned_data.get(f.name) in form[f.name].field.empty_values
):
continue
# Defer saving file-type fields until after the other fields, so a
# callable upload_to can use the values from other fields.
if isinstance(f, models.FileField):
file_field_list.append(f)
else:
f.save_form_data(instance, cleaned_data[f.name])
for f in file_field_list:
f.save_form_data(instance, cleaned_data[f.name])
return instance
# ModelForms #################################################################
def model_to_dict(instance, fields=None, exclude=None):
"""
Return a dict containing the data in ``instance`` suitable for passing as
a Form's ``initial`` keyword argument.
``fields`` is an optional list of field names. If provided, return only the
named.
``exclude`` is an optional list of field names. If provided, exclude the
named from the returned dict, even if they are listed in the ``fields``
argument.
"""
opts = instance._meta
data = {}
for f in chain(opts.concrete_fields, opts.private_fields, opts.many_to_many):
if not getattr(f, 'editable', False):
continue
if fields is not None and f.name not in fields:
continue
if exclude and f.name in exclude:
continue
data[f.name] = f.value_from_object(instance)
return data
def apply_limit_choices_to_to_formfield(formfield):
"""Apply limit_choices_to to the formfield's queryset if needed."""
if hasattr(formfield, 'queryset') and hasattr(formfield, 'get_limit_choices_to'):
limit_choices_to = formfield.get_limit_choices_to()
if limit_choices_to is not None:
formfield.queryset = formfield.queryset.complex_filter(limit_choices_to)
def fields_for_model(model, fields=None, exclude=None, widgets=None,
formfield_callback=None, localized_fields=None,
labels=None, help_texts=None, error_messages=None,
field_classes=None, *, apply_limit_choices_to=True):
"""
Return a dictionary containing form fields for the given model.
``fields`` is an optional list of field names. If provided, return only the
named fields.
``exclude`` is an optional list of field names. If provided, exclude the
named fields from the returned fields, even if they are listed in the
``fields`` argument.
``widgets`` is a dictionary of model field names mapped to a widget.
``formfield_callback`` is a callable that takes a model field and returns
a form field.
``localized_fields`` is a list of names of fields which should be localized.
``labels`` is a dictionary of model field names mapped to a label.
``help_texts`` is a dictionary of model field names mapped to a help text.
``error_messages`` is a dictionary of model field names mapped to a
dictionary of error messages.
``field_classes`` is a dictionary of model field names mapped to a form
field class.
``apply_limit_choices_to`` is a boolean indicating if limit_choices_to
should be applied to a field's queryset.
"""
field_dict = {}
ignored = []
opts = model._meta
# Avoid circular import
from django.db.models import Field as ModelField
sortable_private_fields = [f for f in opts.private_fields if isinstance(f, ModelField)]
for f in sorted(chain(opts.concrete_fields, sortable_private_fields, opts.many_to_many)):
if not getattr(f, 'editable', False):
if (fields is not None and f.name in fields and
(exclude is None or f.name not in exclude)):
raise FieldError(
"'%s' cannot be specified for %s model form as it is a non-editable field" % (
f.name, model.__name__)
)
continue
if fields is not None and f.name not in fields:
continue
if exclude and f.name in exclude:
continue
kwargs = {}
if widgets and f.name in widgets:
kwargs['widget'] = widgets[f.name]
if localized_fields == ALL_FIELDS or (localized_fields and f.name in localized_fields):
kwargs['localize'] = True
if labels and f.name in labels:
kwargs['label'] = labels[f.name]
if help_texts and f.name in help_texts:
kwargs['help_text'] = help_texts[f.name]
if error_messages and f.name in error_messages:
kwargs['error_messages'] = error_messages[f.name]
if field_classes and f.name in field_classes:
kwargs['form_class'] = field_classes[f.name]
if formfield_callback is None:
formfield = f.formfield(**kwargs)
elif not callable(formfield_callback):
raise TypeError('formfield_callback must be a function or callable')
else:
formfield = formfield_callback(f, **kwargs)
if formfield:
if apply_limit_choices_to:
apply_limit_choices_to_to_formfield(formfield)
field_dict[f.name] = formfield
else:
ignored.append(f.name)
if fields:
field_dict = {
f: field_dict.get(f) for f in fields
if (not exclude or f not in exclude) and f not in ignored
}
return field_dict
class ModelFormOptions:
def __init__(self, options=None):
self.model = getattr(options, 'model', None)
self.fields = getattr(options, 'fields', None)
self.exclude = getattr(options, 'exclude', None)
self.widgets = getattr(options, 'widgets', None)
self.localized_fields = getattr(options, 'localized_fields', None)
self.labels = getattr(options, 'labels', None)
self.help_texts = getattr(options, 'help_texts', None)
self.error_messages = getattr(options, 'error_messages', None)
self.field_classes = getattr(options, 'field_classes', None)
class ModelFormMetaclass(DeclarativeFieldsMetaclass):
def __new__(mcs, name, bases, attrs):
base_formfield_callback = None
for b in bases:
if hasattr(b, 'Meta') and hasattr(b.Meta, 'formfield_callback'):
base_formfield_callback = b.Meta.formfield_callback
break
formfield_callback = attrs.pop('formfield_callback', base_formfield_callback)
new_class = super().__new__(mcs, name, bases, attrs)
if bases == (BaseModelForm,):
return new_class
opts = new_class._meta = ModelFormOptions(getattr(new_class, 'Meta', None))
# We check if a string was passed to `fields` or `exclude`,
# which is likely to be a mistake where the user typed ('foo') instead
# of ('foo',)
for opt in ['fields', 'exclude', 'localized_fields']:
value = getattr(opts, opt)
if isinstance(value, str) and value != ALL_FIELDS:
msg = ("%(model)s.Meta.%(opt)s cannot be a string. "
"Did you mean to type: ('%(value)s',)?" % {
'model': new_class.__name__,
'opt': opt,
'value': value,
})
raise TypeError(msg)
if opts.model:
# If a model is defined, extract form fields from it.
if opts.fields is None and opts.exclude is None:
raise ImproperlyConfigured(
"Creating a ModelForm without either the 'fields' attribute "
"or the 'exclude' attribute is prohibited; form %s "
"needs updating." % name
)
if opts.fields == ALL_FIELDS:
# Sentinel for fields_for_model to indicate "get the list of
# fields from the model"
opts.fields = None
fields = fields_for_model(
opts.model, opts.fields, opts.exclude, opts.widgets,
formfield_callback, opts.localized_fields, opts.labels,
opts.help_texts, opts.error_messages, opts.field_classes,
# limit_choices_to will be applied during ModelForm.__init__().
apply_limit_choices_to=False,
)
# make sure opts.fields doesn't specify an invalid field
none_model_fields = {k for k, v in fields.items() if not v}
missing_fields = none_model_fields.difference(new_class.declared_fields)
if missing_fields:
message = 'Unknown field(s) (%s) specified for %s'
message = message % (', '.join(missing_fields),
opts.model.__name__)
raise FieldError(message)
# Override default model fields with any custom declared ones
# (plus, include all the other declared fields).
fields.update(new_class.declared_fields)
else:
fields = new_class.declared_fields
new_class.base_fields = fields
return new_class
class BaseModelForm(BaseForm):
def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
initial=None, error_class=ErrorList, label_suffix=None,
empty_permitted=False, instance=None, use_required_attribute=None,
renderer=None):
opts = self._meta
if opts.model is None:
raise ValueError('ModelForm has no model class specified.')
if instance is None:
# if we didn't get an instance, instantiate a new one
self.instance = opts.model()
object_data = {}
else:
self.instance = instance
object_data = model_to_dict(instance, opts.fields, opts.exclude)
# if initial was provided, it should override the values from instance
if initial is not None:
object_data.update(initial)
# self._validate_unique will be set to True by BaseModelForm.clean().
# It is False by default so overriding self.clean() and failing to call
# super will stop validate_unique from being called.
self._validate_unique = False
super().__init__(
data, files, auto_id, prefix, object_data, error_class,
label_suffix, empty_permitted, use_required_attribute=use_required_attribute,
renderer=renderer,
)
for formfield in self.fields.values():
apply_limit_choices_to_to_formfield(formfield)
def _get_validation_exclusions(self):
"""
For backwards-compatibility, exclude several types of fields from model
validation. See tickets #12507, #12521, #12553.
"""
exclude = []
# Build up a list of fields that should be excluded from model field
# validation and unique checks.
for f in self.instance._meta.fields:
field = f.name
# Exclude fields that aren't on the form. The developer may be
# adding these values to the model after form validation.
if field not in self.fields:
exclude.append(f.name)
# Don't perform model validation on fields that were defined
# manually on the form and excluded via the ModelForm's Meta
# class. See #12901.
elif self._meta.fields and field not in self._meta.fields:
exclude.append(f.name)
elif self._meta.exclude and field in self._meta.exclude:
exclude.append(f.name)
# Exclude fields that failed form validation. There's no need for
# the model fields to validate them as well.
elif field in self._errors:
exclude.append(f.name)
# Exclude empty fields that are not required by the form, if the
# underlying model field is required. This keeps the model field
# from raising a required error. Note: don't exclude the field from
# validation if the model field allows blanks. If it does, the blank
# value may be included in a unique check, so cannot be excluded
# from validation.
else:
form_field = self.fields[field]
field_value = self.cleaned_data.get(field)
if not f.blank and not form_field.required and field_value in form_field.empty_values:
exclude.append(f.name)
return exclude
def clean(self):
self._validate_unique = True
return self.cleaned_data
def _update_errors(self, errors):
# Override any validation error messages defined at the model level
# with those defined at the form level.
opts = self._meta
# Allow the model generated by construct_instance() to raise
# ValidationError and have them handled in the same way as others.
if hasattr(errors, 'error_dict'):
error_dict = errors.error_dict
else:
error_dict = {NON_FIELD_ERRORS: errors}
for field, messages in error_dict.items():
if (field == NON_FIELD_ERRORS and opts.error_messages and
NON_FIELD_ERRORS in opts.error_messages):
error_messages = opts.error_messages[NON_FIELD_ERRORS]
elif field in self.fields:
error_messages = self.fields[field].error_messages
else:
continue
for message in messages:
if (isinstance(message, ValidationError) and
message.code in error_messages):
message.message = error_messages[message.code]
self.add_error(None, errors)
def _post_clean(self):
opts = self._meta
exclude = self._get_validation_exclusions()
# Foreign Keys being used to represent inline relationships
# are excluded from basic field value validation. This is for two
# reasons: firstly, the value may not be supplied (#12507; the
# case of providing new values to the admin); secondly the
# object being referred to may not yet fully exist (#12749).
# However, these fields *must* be included in uniqueness checks,
# so this can't be part of _get_validation_exclusions().
for name, field in self.fields.items():
if isinstance(field, InlineForeignKeyField):
exclude.append(name)
try:
self.instance = construct_instance(self, self.instance, opts.fields, opts.exclude)
except ValidationError as e:
self._update_errors(e)
try:
self.instance.full_clean(exclude=exclude, validate_unique=False)
except ValidationError as e:
self._update_errors(e)
# Validate uniqueness if needed.
if self._validate_unique:
self.validate_unique()
def validate_unique(self):
"""
Call the instance's validate_unique() method and update the form's
validation errors if any were raised.
"""
exclude = self._get_validation_exclusions()
try:
self.instance.validate_unique(exclude=exclude)
except ValidationError as e:
self._update_errors(e)
def _save_m2m(self):
"""
Save the many-to-many fields and generic relations for this form.
"""
cleaned_data = self.cleaned_data
exclude = self._meta.exclude
fields = self._meta.fields
opts = self.instance._meta
# Note that for historical reasons we want to include also
# private_fields here. (GenericRelation was previously a fake
# m2m field).
for f in chain(opts.many_to_many, opts.private_fields):
if not hasattr(f, 'save_form_data'):
continue
if fields and f.name not in fields:
continue
if exclude and f.name in exclude:
continue
if f.name in cleaned_data:
f.save_form_data(self.instance, cleaned_data[f.name])
def save(self, commit=True):
"""
Save this form's self.instance object if commit=True. Otherwise, add
a save_m2m() method to the form which can be called after the instance
is saved manually at a later time. Return the model instance.
"""
if self.errors:
raise ValueError(
"The %s could not be %s because the data didn't validate." % (
self.instance._meta.object_name,
'created' if self.instance._state.adding else 'changed',
)
)
if commit:
# If committing, save the instance and the m2m data immediately.
self.instance.save()
self._save_m2m()
else:
# If not committing, add a method to the form to allow deferred
# saving of m2m data.
self.save_m2m = self._save_m2m
return self.instance
save.alters_data = True
class ModelForm(BaseModelForm, metaclass=ModelFormMetaclass):
pass
def modelform_factory(model, form=ModelForm, fields=None, exclude=None,
formfield_callback=None, widgets=None, localized_fields=None,
labels=None, help_texts=None, error_messages=None,
field_classes=None):
"""
Return a ModelForm containing form fields for the given model. You can
optionally pass a `form` argument to use as a starting point for
constructing the ModelForm.
``fields`` is an optional list of field names. If provided, include only
the named fields in the returned fields. If omitted or '__all__', use all
fields.
``exclude`` is an optional list of field names. If provided, exclude the
named fields from the returned fields, even if they are listed in the
``fields`` argument.
``widgets`` is a dictionary of model field names mapped to a widget.
``localized_fields`` is a list of names of fields which should be localized.
``formfield_callback`` is a callable that takes a model field and returns
a form field.
``labels`` is a dictionary of model field names mapped to a label.
``help_texts`` is a dictionary of model field names mapped to a help text.
``error_messages`` is a dictionary of model field names mapped to a
dictionary of error messages.
``field_classes`` is a dictionary of model field names mapped to a form
field class.
"""
# Create the inner Meta class. FIXME: ideally, we should be able to
# construct a ModelForm without creating and passing in a temporary
# inner class.
# Build up a list of attributes that the Meta object will have.
attrs = {'model': model}
if fields is not None:
attrs['fields'] = fields
if exclude is not None:
attrs['exclude'] = exclude
if widgets is not None:
attrs['widgets'] = widgets
if localized_fields is not None:
attrs['localized_fields'] = localized_fields
if labels is not None:
attrs['labels'] = labels
if help_texts is not None:
attrs['help_texts'] = help_texts
if error_messages is not None:
attrs['error_messages'] = error_messages
if field_classes is not None:
attrs['field_classes'] = field_classes
# If parent form class already has an inner Meta, the Meta we're
# creating needs to inherit from the parent's inner meta.
bases = (form.Meta,) if hasattr(form, 'Meta') else ()
Meta = type('Meta', bases, attrs)
if formfield_callback:
Meta.formfield_callback = staticmethod(formfield_callback)
# Give this new form class a reasonable name.
class_name = model.__name__ + 'Form'
# Class attributes for the new form class.
form_class_attrs = {
'Meta': Meta,
'formfield_callback': formfield_callback
}
if (getattr(Meta, 'fields', None) is None and
getattr(Meta, 'exclude', None) is None):
raise ImproperlyConfigured(
"Calling modelform_factory without defining 'fields' or "
"'exclude' explicitly is prohibited."
)
# Instantiate type(form) in order to use the same metaclass as form.
return type(form)(class_name, (form,), form_class_attrs)
# ModelFormSets ##############################################################
class BaseModelFormSet(BaseFormSet):
"""
A ``FormSet`` for editing a queryset and/or adding new objects to it.
"""
model = None
# Set of fields that must be unique among forms of this set.
unique_fields = set()
def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
queryset=None, *, initial=None, **kwargs):
self.queryset = queryset
self.initial_extra = initial
super().__init__(**{'data': data, 'files': files, 'auto_id': auto_id, 'prefix': prefix, **kwargs})
def initial_form_count(self):
"""Return the number of forms that are required in this FormSet."""
if not self.is_bound:
return len(self.get_queryset())
return super().initial_form_count()
def _existing_object(self, pk):
if not hasattr(self, '_object_dict'):
self._object_dict = {o.pk: o for o in self.get_queryset()}
return self._object_dict.get(pk)
def _get_to_python(self, field):
"""
If the field is a related field, fetch the concrete field's (that
is, the ultimate pointed-to field's) to_python.
"""
while field.remote_field is not None:
field = field.remote_field.get_related_field()
return field.to_python
def _construct_form(self, i, **kwargs):
pk_required = i < self.initial_form_count()
if pk_required:
if self.is_bound:
pk_key = '%s-%s' % (self.add_prefix(i), self.model._meta.pk.name)
try:
pk = self.data[pk_key]
except KeyError:
# The primary key is missing. The user may have tampered
# with POST data.
pass
else:
to_python = self._get_to_python(self.model._meta.pk)
try:
pk = to_python(pk)
except ValidationError:
# The primary key exists but is an invalid value. The
# user may have tampered with POST data.
pass
else:
kwargs['instance'] = self._existing_object(pk)
else:
kwargs['instance'] = self.get_queryset()[i]
elif self.initial_extra:
# Set initial values for extra forms
try:
kwargs['initial'] = self.initial_extra[i - self.initial_form_count()]
except IndexError:
pass
form = super()._construct_form(i, **kwargs)
if pk_required:
form.fields[self.model._meta.pk.name].required = True
return form
def get_queryset(self):
if not hasattr(self, '_queryset'):
if self.queryset is not None:
qs = self.queryset
else:
qs = self.model._default_manager.get_queryset()
# If the queryset isn't already ordered we need to add an
# artificial ordering here to make sure that all formsets
# constructed from this queryset have the same form order.
if not qs.ordered:
qs = qs.order_by(self.model._meta.pk.name)
# Removed queryset limiting here. As per discussion re: #13023
# on django-dev, max_num should not prevent existing
# related objects/inlines from being displayed.
self._queryset = qs
return self._queryset
def save_new(self, form, commit=True):
"""Save and return a new model instance for the given form."""
return form.save(commit=commit)
def save_existing(self, form, instance, commit=True):
"""Save and return an existing model instance for the given form."""
return form.save(commit=commit)
def delete_existing(self, obj, commit=True):
"""Deletes an existing model instance."""
if commit:
obj.delete()
def save(self, commit=True):
"""
Save model instances for every form, adding and changing instances
as necessary, and return the list of instances.
"""
if not commit:
self.saved_forms = []
def save_m2m():
for form in self.saved_forms:
form.save_m2m()
self.save_m2m = save_m2m
return self.save_existing_objects(commit) + self.save_new_objects(commit)
save.alters_data = True
def clean(self):
self.validate_unique()
def validate_unique(self):
# Collect unique_checks and date_checks to run from all the forms.
all_unique_checks = set()
all_date_checks = set()
forms_to_delete = self.deleted_forms
valid_forms = [form for form in self.forms if form.is_valid() and form not in forms_to_delete]
for form in valid_forms:
exclude = form._get_validation_exclusions()
unique_checks, date_checks = form.instance._get_unique_checks(exclude=exclude)
all_unique_checks.update(unique_checks)
all_date_checks.update(date_checks)
errors = []
# Do each of the unique checks (unique and unique_together)
for uclass, unique_check in all_unique_checks:
seen_data = set()
for form in valid_forms:
# Get the data for the set of fields that must be unique among the forms.
row_data = (
field if field in self.unique_fields else form.cleaned_data[field]
for field in unique_check if field in form.cleaned_data
)
# Reduce Model instances to their primary key values
row_data = tuple(
d._get_pk_val() if hasattr(d, '_get_pk_val')
# Prevent "unhashable type: list" errors later on.
else tuple(d) if isinstance(d, list)
else d for d in row_data
)
if row_data and None not in row_data:
# if we've already seen it then we have a uniqueness failure
if row_data in seen_data:
# poke error messages into the right places and mark
# the form as invalid
errors.append(self.get_unique_error_message(unique_check))
form._errors[NON_FIELD_ERRORS] = self.error_class([self.get_form_error()])
# remove the data from the cleaned_data dict since it was invalid
for field in unique_check:
if field in form.cleaned_data:
del form.cleaned_data[field]
# mark the data as seen
seen_data.add(row_data)
# iterate over each of the date checks now
for date_check in all_date_checks:
seen_data = set()
uclass, lookup, field, unique_for = date_check
for form in valid_forms:
# see if we have data for both fields
if (form.cleaned_data and form.cleaned_data[field] is not None and
form.cleaned_data[unique_for] is not None):
# if it's a date lookup we need to get the data for all the fields
if lookup == 'date':
date = form.cleaned_data[unique_for]
date_data = (date.year, date.month, date.day)
# otherwise it's just the attribute on the date/datetime
# object
else:
date_data = (getattr(form.cleaned_data[unique_for], lookup),)
data = (form.cleaned_data[field],) + date_data
# if we've already seen it then we have a uniqueness failure
if data in seen_data:
# poke error messages into the right places and mark
# the form as invalid
errors.append(self.get_date_error_message(date_check))
form._errors[NON_FIELD_ERRORS] = self.error_class([self.get_form_error()])
# remove the data from the cleaned_data dict since it was invalid
del form.cleaned_data[field]
# mark the data as seen
seen_data.add(data)
if errors:
raise ValidationError(errors)
def get_unique_error_message(self, unique_check):
if len(unique_check) == 1:
return gettext("Please correct the duplicate data for %(field)s.") % {
"field": unique_check[0],
}
else:
return gettext("Please correct the duplicate data for %(field)s, which must be unique.") % {
"field": get_text_list(unique_check, _("and")),
}
def get_date_error_message(self, date_check):
return gettext(
"Please correct the duplicate data for %(field_name)s "
"which must be unique for the %(lookup)s in %(date_field)s."
) % {
'field_name': date_check[2],
'date_field': date_check[3],
'lookup': str(date_check[1]),
}
def get_form_error(self):
return gettext("Please correct the duplicate values below.")
def save_existing_objects(self, commit=True):
self.changed_objects = []
self.deleted_objects = []
if not self.initial_forms:
return []
saved_instances = []
forms_to_delete = self.deleted_forms
for form in self.initial_forms:
obj = form.instance
# If the pk is None, it means either:
# 1. The object is an unexpected empty model, created by invalid
# POST data such as an object outside the formset's queryset.
# 2. The object was already deleted from the database.
if obj.pk is None:
continue
if form in forms_to_delete:
self.deleted_objects.append(obj)
self.delete_existing(obj, commit=commit)
elif form.has_changed():
self.changed_objects.append((obj, form.changed_data))
saved_instances.append(self.save_existing(form, obj, commit=commit))
if not commit:
self.saved_forms.append(form)
return saved_instances
def save_new_objects(self, commit=True):
self.new_objects = []
for form in self.extra_forms:
if not form.has_changed():
continue
# If someone has marked an add form for deletion, don't save the
# object.
if self.can_delete and self._should_delete_form(form):
continue
self.new_objects.append(self.save_new(form, commit=commit))
if not commit:
self.saved_forms.append(form)
return self.new_objects
def add_fields(self, form, index):
"""Add a hidden field for the object's primary key."""
from django.db.models import AutoField, OneToOneField, ForeignKey
self._pk_field = pk = self.model._meta.pk
# If a pk isn't editable, then it won't be on the form, so we need to
# add it here so we can tell which object is which when we get the
# data back. Generally, pk.editable should be false, but for some
# reason, auto_created pk fields and AutoField's editable attribute is
# True, so check for that as well.
def pk_is_not_editable(pk):
return (
(not pk.editable) or (pk.auto_created or isinstance(pk, AutoField)) or (
pk.remote_field and pk.remote_field.parent_link and
pk_is_not_editable(pk.remote_field.model._meta.pk)
)
)
if pk_is_not_editable(pk) or pk.name not in form.fields:
if form.is_bound:
# If we're adding the related instance, ignore its primary key
# as it could be an auto-generated default which isn't actually
# in the database.
pk_value = None if form.instance._state.adding else form.instance.pk
else:
try:
if index is not None:
pk_value = self.get_queryset()[index].pk
else:
pk_value = None
except IndexError:
pk_value = None
if isinstance(pk, (ForeignKey, OneToOneField)):
qs = pk.remote_field.model._default_manager.get_queryset()
else:
qs = self.model._default_manager.get_queryset()
qs = qs.using(form.instance._state.db)
if form._meta.widgets:
widget = form._meta.widgets.get(self._pk_field.name, HiddenInput)
else:
widget = HiddenInput
form.fields[self._pk_field.name] = ModelChoiceField(qs, initial=pk_value, required=False, widget=widget)
super().add_fields(form, index)
def modelformset_factory(model, form=ModelForm, formfield_callback=None,
formset=BaseModelFormSet, extra=1, can_delete=False,
can_order=False, max_num=None, fields=None, exclude=None,
widgets=None, validate_max=False, localized_fields=None,
labels=None, help_texts=None, error_messages=None,
min_num=None, validate_min=False, field_classes=None):
"""Return a FormSet class for the given Django model class."""
meta = getattr(form, 'Meta', None)
if (getattr(meta, 'fields', fields) is None and
getattr(meta, 'exclude', exclude) is None):
raise ImproperlyConfigured(
"Calling modelformset_factory without defining 'fields' or "
"'exclude' explicitly is prohibited."
)
form = modelform_factory(model, form=form, fields=fields, exclude=exclude,
formfield_callback=formfield_callback,
widgets=widgets, localized_fields=localized_fields,
labels=labels, help_texts=help_texts,
error_messages=error_messages, field_classes=field_classes)
FormSet = formset_factory(form, formset, extra=extra, min_num=min_num, max_num=max_num,
can_order=can_order, can_delete=can_delete,
validate_min=validate_min, validate_max=validate_max)
FormSet.model = model
return FormSet
# InlineFormSets #############################################################
class BaseInlineFormSet(BaseModelFormSet):
"""A formset for child objects related to a parent."""
def __init__(self, data=None, files=None, instance=None,
save_as_new=False, prefix=None, queryset=None, **kwargs):
if instance is None:
self.instance = self.fk.remote_field.model()
else:
self.instance = instance
self.save_as_new = save_as_new
if queryset is None:
queryset = self.model._default_manager
if self.instance.pk is not None:
qs = queryset.filter(**{self.fk.name: self.instance})
else:
qs = queryset.none()
self.unique_fields = {self.fk.name}
super().__init__(data, files, prefix=prefix, queryset=qs, **kwargs)
# Add the generated field to form._meta.fields if it's defined to make
# sure validation isn't skipped on that field.
if self.form._meta.fields and self.fk.name not in self.form._meta.fields:
if isinstance(self.form._meta.fields, tuple):
self.form._meta.fields = list(self.form._meta.fields)
self.form._meta.fields.append(self.fk.name)
def initial_form_count(self):
if self.save_as_new:
return 0
return super().initial_form_count()
def _construct_form(self, i, **kwargs):
form = super()._construct_form(i, **kwargs)
if self.save_as_new:
mutable = getattr(form.data, '_mutable', None)
# Allow modifying an immutable QueryDict.
if mutable is not None:
form.data._mutable = True
# Remove the primary key from the form's data, we are only
# creating new instances
form.data[form.add_prefix(self._pk_field.name)] = None
# Remove the foreign key from the form's data
form.data[form.add_prefix(self.fk.name)] = None
if mutable is not None:
form.data._mutable = mutable
# Set the fk value here so that the form can do its validation.
fk_value = self.instance.pk
if self.fk.remote_field.field_name != self.fk.remote_field.model._meta.pk.name:
fk_value = getattr(self.instance, self.fk.remote_field.field_name)
fk_value = getattr(fk_value, 'pk', fk_value)
setattr(form.instance, self.fk.get_attname(), fk_value)
return form
@classmethod
def get_default_prefix(cls):
return cls.fk.remote_field.get_accessor_name(model=cls.model).replace('+', '')
def save_new(self, form, commit=True):
# Ensure the latest copy of the related instance is present on each
# form (it may have been saved after the formset was originally
# instantiated).
setattr(form.instance, self.fk.name, self.instance)
return super().save_new(form, commit=commit)
def add_fields(self, form, index):
super().add_fields(form, index)
if self._pk_field == self.fk:
name = self._pk_field.name
kwargs = {'pk_field': True}
else:
# The foreign key field might not be on the form, so we poke at the
# Model field to get the label, since we need that for error messages.
name = self.fk.name
kwargs = {
'label': getattr(form.fields.get(name), 'label', capfirst(self.fk.verbose_name))
}
# The InlineForeignKeyField assumes that the foreign key relation is
# based on the parent model's pk. If this isn't the case, set to_field
# to correctly resolve the initial form value.
if self.fk.remote_field.field_name != self.fk.remote_field.model._meta.pk.name:
kwargs['to_field'] = self.fk.remote_field.field_name
# If we're adding a new object, ignore a parent's auto-generated key
# as it will be regenerated on the save request.
if self.instance._state.adding:
if kwargs.get('to_field') is not None:
to_field = self.instance._meta.get_field(kwargs['to_field'])
else:
to_field = self.instance._meta.pk
if to_field.has_default():
setattr(self.instance, to_field.attname, None)
form.fields[name] = InlineForeignKeyField(self.instance, **kwargs)
def get_unique_error_message(self, unique_check):
unique_check = [field for field in unique_check if field != self.fk.name]
return super().get_unique_error_message(unique_check)
def _get_foreign_key(parent_model, model, fk_name=None, can_fail=False):
"""
Find and return the ForeignKey from model to parent if there is one
(return None if can_fail is True and no such field exists). If fk_name is
provided, assume it is the name of the ForeignKey field. Unless can_fail is
True, raise an exception if there isn't a ForeignKey from model to
parent_model.
"""
# avoid circular import
from django.db.models import ForeignKey
opts = model._meta
if fk_name:
fks_to_parent = [f for f in opts.fields if f.name == fk_name]
if len(fks_to_parent) == 1:
fk = fks_to_parent[0]
if not isinstance(fk, ForeignKey) or \
(fk.remote_field.model != parent_model and
fk.remote_field.model not in parent_model._meta.get_parent_list()):
raise ValueError(
"fk_name '%s' is not a ForeignKey to '%s'." % (fk_name, parent_model._meta.label)
)
elif not fks_to_parent:
raise ValueError(
"'%s' has no field named '%s'." % (model._meta.label, fk_name)
)
else:
# Try to discover what the ForeignKey from model to parent_model is
fks_to_parent = [
f for f in opts.fields
if isinstance(f, ForeignKey) and (
f.remote_field.model == parent_model or
f.remote_field.model in parent_model._meta.get_parent_list()
)
]
if len(fks_to_parent) == 1:
fk = fks_to_parent[0]
elif not fks_to_parent:
if can_fail:
return
raise ValueError(
"'%s' has no ForeignKey to '%s'." % (
model._meta.label,
parent_model._meta.label,
)
)
else:
raise ValueError(
"'%s' has more than one ForeignKey to '%s'. You must specify "
"a 'fk_name' attribute." % (
model._meta.label,
parent_model._meta.label,
)
)
return fk
def inlineformset_factory(parent_model, model, form=ModelForm,
formset=BaseInlineFormSet, fk_name=None,
fields=None, exclude=None, extra=3, can_order=False,
can_delete=True, max_num=None, formfield_callback=None,
widgets=None, validate_max=False, localized_fields=None,
labels=None, help_texts=None, error_messages=None,
min_num=None, validate_min=False, field_classes=None):
"""
Return an ``InlineFormSet`` for the given kwargs.
``fk_name`` must be provided if ``model`` has more than one ``ForeignKey``
to ``parent_model``.
"""
fk = _get_foreign_key(parent_model, model, fk_name=fk_name)
# enforce a max_num=1 when the foreign key to the parent model is unique.
if fk.unique:
max_num = 1
kwargs = {
'form': form,
'formfield_callback': formfield_callback,
'formset': formset,
'extra': extra,
'can_delete': can_delete,
'can_order': can_order,
'fields': fields,
'exclude': exclude,
'min_num': min_num,
'max_num': max_num,
'widgets': widgets,
'validate_min': validate_min,
'validate_max': validate_max,
'localized_fields': localized_fields,
'labels': labels,
'help_texts': help_texts,
'error_messages': error_messages,
'field_classes': field_classes,
}
FormSet = modelformset_factory(model, **kwargs)
FormSet.fk = fk
return FormSet
# Fields #####################################################################
class InlineForeignKeyField(Field):
"""
A basic integer field that deals with validating the given value to a
given parent instance in an inline.
"""
widget = HiddenInput
default_error_messages = {
'invalid_choice': _('The inline value did not match the parent instance.'),
}
def __init__(self, parent_instance, *args, pk_field=False, to_field=None, **kwargs):
self.parent_instance = parent_instance
self.pk_field = pk_field
self.to_field = to_field
if self.parent_instance is not None:
if self.to_field:
kwargs["initial"] = getattr(self.parent_instance, self.to_field)
else:
kwargs["initial"] = self.parent_instance.pk
kwargs["required"] = False
super().__init__(*args, **kwargs)
def clean(self, value):
if value in self.empty_values:
if self.pk_field:
return None
# if there is no value act as we did before.
return self.parent_instance
# ensure the we compare the values as equal types.
if self.to_field:
orig = getattr(self.parent_instance, self.to_field)
else:
orig = self.parent_instance.pk
if str(value) != str(orig):
raise ValidationError(self.error_messages['invalid_choice'], code='invalid_choice')
return self.parent_instance
def has_changed(self, initial, data):
return False
class ModelChoiceIteratorValue:
def __init__(self, value, instance):
self.value = value
self.instance = instance
def __str__(self):
return str(self.value)
def __eq__(self, other):
if isinstance(other, ModelChoiceIteratorValue):
other = other.value
return self.value == other
class ModelChoiceIterator:
def __init__(self, field):
self.field = field
self.queryset = field.queryset
def __iter__(self):
if self.field.empty_label is not None:
yield ("", self.field.empty_label)
queryset = self.queryset
# Can't use iterator() when queryset uses prefetch_related()
if not queryset._prefetch_related_lookups:
queryset = queryset.iterator()
for obj in queryset:
yield self.choice(obj)
def __len__(self):
# count() adds a query but uses less memory since the QuerySet results
# won't be cached. In most cases, the choices will only be iterated on,
# and __len__() won't be called.
return self.queryset.count() + (1 if self.field.empty_label is not None else 0)
def __bool__(self):
return self.field.empty_label is not None or self.queryset.exists()
def choice(self, obj):
return (
ModelChoiceIteratorValue(self.field.prepare_value(obj), obj),
self.field.label_from_instance(obj),
)
class ModelChoiceField(ChoiceField):
"""A ChoiceField whose choices are a model QuerySet."""
# This class is a subclass of ChoiceField for purity, but it doesn't
# actually use any of ChoiceField's implementation.
default_error_messages = {
'invalid_choice': _('Select a valid choice. That choice is not one of'
' the available choices.'),
}
iterator = ModelChoiceIterator
def __init__(self, queryset, *, empty_label="---------",
required=True, widget=None, label=None, initial=None,
help_text='', to_field_name=None, limit_choices_to=None,
**kwargs):
if required and (initial is not None):
self.empty_label = None
else:
self.empty_label = empty_label
# Call Field instead of ChoiceField __init__() because we don't need
# ChoiceField.__init__().
Field.__init__(
self, required=required, widget=widget, label=label,
initial=initial, help_text=help_text, **kwargs
)
self.queryset = queryset
self.limit_choices_to = limit_choices_to # limit the queryset later.
self.to_field_name = to_field_name
def get_limit_choices_to(self):
"""
Return ``limit_choices_to`` for this form field.
If it is a callable, invoke it and return the result.
"""
if callable(self.limit_choices_to):
return self.limit_choices_to()
return self.limit_choices_to
def __deepcopy__(self, memo):
result = super(ChoiceField, self).__deepcopy__(memo)
# Need to force a new ModelChoiceIterator to be created, bug #11183
if self.queryset is not None:
result.queryset = self.queryset.all()
return result
def _get_queryset(self):
return self._queryset
def _set_queryset(self, queryset):
self._queryset = None if queryset is None else queryset.all()
self.widget.choices = self.choices
queryset = property(_get_queryset, _set_queryset)
# this method will be used to create object labels by the QuerySetIterator.
# Override it to customize the label.
def label_from_instance(self, obj):
"""
Convert objects into strings and generate the labels for the choices
presented by this object. Subclasses can override this method to
customize the display of the choices.
"""
return str(obj)
def _get_choices(self):
# If self._choices is set, then somebody must have manually set
# the property self.choices. In this case, just return self._choices.
if hasattr(self, '_choices'):
return self._choices
# Otherwise, execute the QuerySet in self.queryset to determine the
# choices dynamically. Return a fresh ModelChoiceIterator that has not been
# consumed. Note that we're instantiating a new ModelChoiceIterator *each*
# time _get_choices() is called (and, thus, each time self.choices is
# accessed) so that we can ensure the QuerySet has not been consumed. This
# construct might look complicated but it allows for lazy evaluation of
# the queryset.
return self.iterator(self)
choices = property(_get_choices, ChoiceField._set_choices)
def prepare_value(self, value):
if hasattr(value, '_meta'):
if self.to_field_name:
return value.serializable_value(self.to_field_name)
else:
return value.pk
return super().prepare_value(value)
def to_python(self, value):
if value in self.empty_values:
return None
try:
key = self.to_field_name or 'pk'
if isinstance(value, self.queryset.model):
value = getattr(value, key)
value = self.queryset.get(**{key: value})
except (ValueError, TypeError, self.queryset.model.DoesNotExist):
raise ValidationError(self.error_messages['invalid_choice'], code='invalid_choice')
return value
def validate(self, value):
return Field.validate(self, value)
def has_changed(self, initial, data):
if self.disabled:
return False
initial_value = initial if initial is not None else ''
data_value = data if data is not None else ''
return str(self.prepare_value(initial_value)) != str(data_value)
class ModelMultipleChoiceField(ModelChoiceField):
"""A MultipleChoiceField whose choices are a model QuerySet."""
widget = SelectMultiple
hidden_widget = MultipleHiddenInput
default_error_messages = {
'list': _('Enter a list of values.'),
'invalid_choice': _('Select a valid choice. %(value)s is not one of the'
' available choices.'),
'invalid_pk_value': _('“%(pk)s” is not a valid value.')
}
def __init__(self, queryset, **kwargs):
super().__init__(queryset, empty_label=None, **kwargs)
def to_python(self, value):
if not value:
return []
return list(self._check_values(value))
def clean(self, value):
value = self.prepare_value(value)
if self.required and not value:
raise ValidationError(self.error_messages['required'], code='required')
elif not self.required and not value:
return self.queryset.none()
if not isinstance(value, (list, tuple)):
raise ValidationError(self.error_messages['list'], code='list')
qs = self._check_values(value)
# Since this overrides the inherited ModelChoiceField.clean
# we run custom validators here
self.run_validators(value)
return qs
def _check_values(self, value):
"""
Given a list of possible PK values, return a QuerySet of the
corresponding objects. Raise a ValidationError if a given value is
invalid (not a valid PK, not in the queryset, etc.)
"""
key = self.to_field_name or 'pk'
# deduplicate given values to avoid creating many querysets or
# requiring the database backend deduplicate efficiently.
try:
value = frozenset(value)
except TypeError:
# list of lists isn't hashable, for example
raise ValidationError(
self.error_messages['list'],
code='list',
)
for pk in value:
try:
self.queryset.filter(**{key: pk})
except (ValueError, TypeError):
raise ValidationError(
self.error_messages['invalid_pk_value'],
code='invalid_pk_value',
params={'pk': pk},
)
qs = self.queryset.filter(**{'%s__in' % key: value})
pks = {str(getattr(o, key)) for o in qs}
for val in value:
if str(val) not in pks:
raise ValidationError(
self.error_messages['invalid_choice'],
code='invalid_choice',
params={'value': val},
)
return qs
def prepare_value(self, value):
if (hasattr(value, '__iter__') and
not isinstance(value, str) and
not hasattr(value, '_meta')):
prepare_value = super().prepare_value
return [prepare_value(v) for v in value]
return super().prepare_value(value)
def has_changed(self, initial, data):
if self.disabled:
return False
if initial is None:
initial = []
if data is None:
data = []
if len(initial) != len(data):
return True
initial_set = {str(value) for value in self.prepare_value(initial)}
data_set = {str(value) for value in data}
return data_set != initial_set
def modelform_defines_fields(form_class):
return hasattr(form_class, '_meta') and (
form_class._meta.fields is not None or
form_class._meta.exclude is not None
)
|
af54e0f50eb1ca5c50ad4927c17452747a6f5713b34091e40ce43b65751f4be2 | import copy
from contextlib import contextmanager
from django.apps import AppConfig
from django.apps.registry import Apps, apps as global_apps
from django.conf import settings
from django.db import models
from django.db.models.fields.related import RECURSIVE_RELATIONSHIP_CONSTANT
from django.db.models.options import DEFAULT_NAMES, normalize_together
from django.db.models.utils import make_model_tuple
from django.utils.functional import cached_property
from django.utils.module_loading import import_string
from django.utils.version import get_docs_version
from .exceptions import InvalidBasesError
def _get_app_label_and_model_name(model, app_label=''):
if isinstance(model, str):
split = model.split('.', 1)
return tuple(split) if len(split) == 2 else (app_label, split[0])
else:
return model._meta.app_label, model._meta.model_name
def _get_related_models(m):
"""Return all models that have a direct relationship to the given model."""
related_models = [
subclass for subclass in m.__subclasses__()
if issubclass(subclass, models.Model)
]
related_fields_models = set()
for f in m._meta.get_fields(include_parents=True, include_hidden=True):
if f.is_relation and f.related_model is not None and not isinstance(f.related_model, str):
related_fields_models.add(f.model)
related_models.append(f.related_model)
# Reverse accessors of foreign keys to proxy models are attached to their
# concrete proxied model.
opts = m._meta
if opts.proxy and m in related_fields_models:
related_models.append(opts.concrete_model)
return related_models
def get_related_models_tuples(model):
"""
Return a list of typical (app_label, model_name) tuples for all related
models for the given model.
"""
return {
(rel_mod._meta.app_label, rel_mod._meta.model_name)
for rel_mod in _get_related_models(model)
}
def get_related_models_recursive(model):
"""
Return all models that have a direct or indirect relationship
to the given model.
Relationships are either defined by explicit relational fields, like
ForeignKey, ManyToManyField or OneToOneField, or by inheriting from another
model (a superclass is related to its subclasses, but not vice versa). Note,
however, that a model inheriting from a concrete model is also related to
its superclass through the implicit *_ptr OneToOneField on the subclass.
"""
seen = set()
queue = _get_related_models(model)
for rel_mod in queue:
rel_app_label, rel_model_name = rel_mod._meta.app_label, rel_mod._meta.model_name
if (rel_app_label, rel_model_name) in seen:
continue
seen.add((rel_app_label, rel_model_name))
queue.extend(_get_related_models(rel_mod))
return seen - {(model._meta.app_label, model._meta.model_name)}
class ProjectState:
"""
Represent the entire project's overall state. This is the item that is
passed around - do it here rather than at the app level so that cross-app
FKs/etc. resolve properly.
"""
def __init__(self, models=None, real_apps=None):
self.models = models or {}
# Apps to include from main registry, usually unmigrated ones
self.real_apps = real_apps or []
self.is_delayed = False
def add_model(self, model_state):
app_label, model_name = model_state.app_label, model_state.name_lower
self.models[(app_label, model_name)] = model_state
if 'apps' in self.__dict__: # hasattr would cache the property
self.reload_model(app_label, model_name)
def remove_model(self, app_label, model_name):
del self.models[app_label, model_name]
if 'apps' in self.__dict__: # hasattr would cache the property
self.apps.unregister_model(app_label, model_name)
# Need to do this explicitly since unregister_model() doesn't clear
# the cache automatically (#24513)
self.apps.clear_cache()
def _find_reload_model(self, app_label, model_name, delay=False):
if delay:
self.is_delayed = True
related_models = set()
try:
old_model = self.apps.get_model(app_label, model_name)
except LookupError:
pass
else:
# Get all relations to and from the old model before reloading,
# as _meta.apps may change
if delay:
related_models = get_related_models_tuples(old_model)
else:
related_models = get_related_models_recursive(old_model)
# Get all outgoing references from the model to be rendered
model_state = self.models[(app_label, model_name)]
# Directly related models are the models pointed to by ForeignKeys,
# OneToOneFields, and ManyToManyFields.
direct_related_models = set()
for name, field in model_state.fields:
if field.is_relation:
if field.remote_field.model == RECURSIVE_RELATIONSHIP_CONSTANT:
continue
rel_app_label, rel_model_name = _get_app_label_and_model_name(field.related_model, app_label)
direct_related_models.add((rel_app_label, rel_model_name.lower()))
# For all direct related models recursively get all related models.
related_models.update(direct_related_models)
for rel_app_label, rel_model_name in direct_related_models:
try:
rel_model = self.apps.get_model(rel_app_label, rel_model_name)
except LookupError:
pass
else:
if delay:
related_models.update(get_related_models_tuples(rel_model))
else:
related_models.update(get_related_models_recursive(rel_model))
# Include the model itself
related_models.add((app_label, model_name))
return related_models
def reload_model(self, app_label, model_name, delay=False):
if 'apps' in self.__dict__: # hasattr would cache the property
related_models = self._find_reload_model(app_label, model_name, delay)
self._reload(related_models)
def reload_models(self, models, delay=True):
if 'apps' in self.__dict__: # hasattr would cache the property
related_models = set()
for app_label, model_name in models:
related_models.update(self._find_reload_model(app_label, model_name, delay))
self._reload(related_models)
def _reload(self, related_models):
# Unregister all related models
with self.apps.bulk_update():
for rel_app_label, rel_model_name in related_models:
self.apps.unregister_model(rel_app_label, rel_model_name)
states_to_be_rendered = []
# Gather all models states of those models that will be rerendered.
# This includes:
# 1. All related models of unmigrated apps
for model_state in self.apps.real_models:
if (model_state.app_label, model_state.name_lower) in related_models:
states_to_be_rendered.append(model_state)
# 2. All related models of migrated apps
for rel_app_label, rel_model_name in related_models:
try:
model_state = self.models[rel_app_label, rel_model_name]
except KeyError:
pass
else:
states_to_be_rendered.append(model_state)
# Render all models
self.apps.render_multiple(states_to_be_rendered)
def clone(self):
"""Return an exact copy of this ProjectState."""
new_state = ProjectState(
models={k: v.clone() for k, v in self.models.items()},
real_apps=self.real_apps,
)
if 'apps' in self.__dict__:
new_state.apps = self.apps.clone()
new_state.is_delayed = self.is_delayed
return new_state
def clear_delayed_apps_cache(self):
if self.is_delayed and 'apps' in self.__dict__:
del self.__dict__['apps']
@cached_property
def apps(self):
return StateApps(self.real_apps, self.models)
@property
def concrete_apps(self):
self.apps = StateApps(self.real_apps, self.models, ignore_swappable=True)
return self.apps
@classmethod
def from_apps(cls, apps):
"""Take an Apps and return a ProjectState matching it."""
app_models = {}
for model in apps.get_models(include_swapped=True):
model_state = ModelState.from_model(model)
app_models[(model_state.app_label, model_state.name_lower)] = model_state
return cls(app_models)
def __eq__(self, other):
return self.models == other.models and set(self.real_apps) == set(other.real_apps)
class AppConfigStub(AppConfig):
"""Stub of an AppConfig. Only provides a label and a dict of models."""
# Not used, but required by AppConfig.__init__
path = ''
def __init__(self, label):
self.label = label
# App-label and app-name are not the same thing, so technically passing
# in the label here is wrong. In practice, migrations don't care about
# the app name, but we need something unique, and the label works fine.
super().__init__(label, None)
def import_models(self):
self.models = self.apps.all_models[self.label]
class StateApps(Apps):
"""
Subclass of the global Apps registry class to better handle dynamic model
additions and removals.
"""
def __init__(self, real_apps, models, ignore_swappable=False):
# Any apps in self.real_apps should have all their models included
# in the render. We don't use the original model instances as there
# are some variables that refer to the Apps object.
# FKs/M2Ms from real apps are also not included as they just
# mess things up with partial states (due to lack of dependencies)
self.real_models = []
for app_label in real_apps:
app = global_apps.get_app_config(app_label)
for model in app.get_models():
self.real_models.append(ModelState.from_model(model, exclude_rels=True))
# Populate the app registry with a stub for each application.
app_labels = {model_state.app_label for model_state in models.values()}
app_configs = [AppConfigStub(label) for label in sorted([*real_apps, *app_labels])]
super().__init__(app_configs)
# These locks get in the way of copying as implemented in clone(),
# which is called whenever Django duplicates a StateApps before
# updating it.
self._lock = None
self.ready_event = None
self.render_multiple([*models.values(), *self.real_models])
# There shouldn't be any operations pending at this point.
from django.core.checks.model_checks import _check_lazy_references
ignore = {make_model_tuple(settings.AUTH_USER_MODEL)} if ignore_swappable else set()
errors = _check_lazy_references(self, ignore=ignore)
if errors:
raise ValueError("\n".join(error.msg for error in errors))
@contextmanager
def bulk_update(self):
# Avoid clearing each model's cache for each change. Instead, clear
# all caches when we're finished updating the model instances.
ready = self.ready
self.ready = False
try:
yield
finally:
self.ready = ready
self.clear_cache()
def render_multiple(self, model_states):
# We keep trying to render the models in a loop, ignoring invalid
# base errors, until the size of the unrendered models doesn't
# decrease by at least one, meaning there's a base dependency loop/
# missing base.
if not model_states:
return
# Prevent that all model caches are expired for each render.
with self.bulk_update():
unrendered_models = model_states
while unrendered_models:
new_unrendered_models = []
for model in unrendered_models:
try:
model.render(self)
except InvalidBasesError:
new_unrendered_models.append(model)
if len(new_unrendered_models) == len(unrendered_models):
raise InvalidBasesError(
"Cannot resolve bases for %r\nThis can happen if you are inheriting models from an "
"app with migrations (e.g. contrib.auth)\n in an app with no migrations; see "
"https://docs.djangoproject.com/en/%s/topics/migrations/#dependencies "
"for more" % (new_unrendered_models, get_docs_version())
)
unrendered_models = new_unrendered_models
def clone(self):
"""Return a clone of this registry."""
clone = StateApps([], {})
clone.all_models = copy.deepcopy(self.all_models)
clone.app_configs = copy.deepcopy(self.app_configs)
# Set the pointer to the correct app registry.
for app_config in clone.app_configs.values():
app_config.apps = clone
# No need to actually clone them, they'll never change
clone.real_models = self.real_models
return clone
def register_model(self, app_label, model):
self.all_models[app_label][model._meta.model_name] = model
if app_label not in self.app_configs:
self.app_configs[app_label] = AppConfigStub(app_label)
self.app_configs[app_label].apps = self
self.app_configs[app_label].models = {}
self.app_configs[app_label].models[model._meta.model_name] = model
self.do_pending_operations(model)
self.clear_cache()
def unregister_model(self, app_label, model_name):
try:
del self.all_models[app_label][model_name]
del self.app_configs[app_label].models[model_name]
except KeyError:
pass
class ModelState:
"""
Represent a Django Model. Don't use the actual Model class as it's not
designed to have its options changed - instead, mutate this one and then
render it into a Model as required.
Note that while you are allowed to mutate .fields, you are not allowed
to mutate the Field instances inside there themselves - you must instead
assign new ones, as these are not detached during a clone.
"""
def __init__(self, app_label, name, fields, options=None, bases=None, managers=None):
self.app_label = app_label
self.name = name
self.fields = fields
self.options = options or {}
self.options.setdefault('indexes', [])
self.options.setdefault('constraints', [])
self.bases = bases or (models.Model,)
self.managers = managers or []
# Sanity-check that fields is NOT a dict. It must be ordered.
if isinstance(self.fields, dict):
raise ValueError("ModelState.fields cannot be a dict - it must be a list of 2-tuples.")
for name, field in fields:
# Sanity-check that fields are NOT already bound to a model.
if hasattr(field, 'model'):
raise ValueError(
'ModelState.fields cannot be bound to a model - "%s" is.' % name
)
# Sanity-check that relation fields are NOT referring to a model class.
if field.is_relation and hasattr(field.related_model, '_meta'):
raise ValueError(
'ModelState.fields cannot refer to a model class - "%s.to" does. '
'Use a string reference instead.' % name
)
if field.many_to_many and hasattr(field.remote_field.through, '_meta'):
raise ValueError(
'ModelState.fields cannot refer to a model class - "%s.through" does. '
'Use a string reference instead.' % name
)
# Sanity-check that indexes have their name set.
for index in self.options['indexes']:
if not index.name:
raise ValueError(
"Indexes passed to ModelState require a name attribute. "
"%r doesn't have one." % index
)
@cached_property
def name_lower(self):
return self.name.lower()
@classmethod
def from_model(cls, model, exclude_rels=False):
"""Given a model, return a ModelState representing it."""
# Deconstruct the fields
fields = []
for field in model._meta.local_fields:
if getattr(field, "remote_field", None) and exclude_rels:
continue
if isinstance(field, models.OrderWrt):
continue
name = field.name
try:
fields.append((name, field.clone()))
except TypeError as e:
raise TypeError("Couldn't reconstruct field %s on %s: %s" % (
name,
model._meta.label,
e,
))
if not exclude_rels:
for field in model._meta.local_many_to_many:
name = field.name
try:
fields.append((name, field.clone()))
except TypeError as e:
raise TypeError("Couldn't reconstruct m2m field %s on %s: %s" % (
name,
model._meta.object_name,
e,
))
# Extract the options
options = {}
for name in DEFAULT_NAMES:
# Ignore some special options
if name in ["apps", "app_label"]:
continue
elif name in model._meta.original_attrs:
if name == "unique_together":
ut = model._meta.original_attrs["unique_together"]
options[name] = set(normalize_together(ut))
elif name == "index_together":
it = model._meta.original_attrs["index_together"]
options[name] = set(normalize_together(it))
elif name == "indexes":
indexes = [idx.clone() for idx in model._meta.indexes]
for index in indexes:
if not index.name:
index.set_name_with_model(model)
options['indexes'] = indexes
elif name == 'constraints':
options['constraints'] = [con.clone() for con in model._meta.constraints]
else:
options[name] = model._meta.original_attrs[name]
# If we're ignoring relationships, remove all field-listing model
# options (that option basically just means "make a stub model")
if exclude_rels:
for key in ["unique_together", "index_together", "order_with_respect_to"]:
if key in options:
del options[key]
# Private fields are ignored, so remove options that refer to them.
elif options.get('order_with_respect_to') in {field.name for field in model._meta.private_fields}:
del options['order_with_respect_to']
def flatten_bases(model):
bases = []
for base in model.__bases__:
if hasattr(base, "_meta") and base._meta.abstract:
bases.extend(flatten_bases(base))
else:
bases.append(base)
return bases
# We can't rely on __mro__ directly because we only want to flatten
# abstract models and not the whole tree. However by recursing on
# __bases__ we may end up with duplicates and ordering issues, we
# therefore discard any duplicates and reorder the bases according
# to their index in the MRO.
flattened_bases = sorted(set(flatten_bases(model)), key=lambda x: model.__mro__.index(x))
# Make our record
bases = tuple(
(
base._meta.label_lower
if hasattr(base, "_meta") else
base
)
for base in flattened_bases
)
# Ensure at least one base inherits from models.Model
if not any((isinstance(base, str) or issubclass(base, models.Model)) for base in bases):
bases = (models.Model,)
managers = []
manager_names = set()
default_manager_shim = None
for manager in model._meta.managers:
if manager.name in manager_names:
# Skip overridden managers.
continue
elif manager.use_in_migrations:
# Copy managers usable in migrations.
new_manager = copy.copy(manager)
new_manager._set_creation_counter()
elif manager is model._base_manager or manager is model._default_manager:
# Shim custom managers used as default and base managers.
new_manager = models.Manager()
new_manager.model = manager.model
new_manager.name = manager.name
if manager is model._default_manager:
default_manager_shim = new_manager
else:
continue
manager_names.add(manager.name)
managers.append((manager.name, new_manager))
# Ignore a shimmed default manager called objects if it's the only one.
if managers == [('objects', default_manager_shim)]:
managers = []
# Construct the new ModelState
return cls(
model._meta.app_label,
model._meta.object_name,
fields,
options,
bases,
managers,
)
def construct_managers(self):
"""Deep-clone the managers using deconstruction."""
# Sort all managers by their creation counter
sorted_managers = sorted(self.managers, key=lambda v: v[1].creation_counter)
for mgr_name, manager in sorted_managers:
as_manager, manager_path, qs_path, args, kwargs = manager.deconstruct()
if as_manager:
qs_class = import_string(qs_path)
yield mgr_name, qs_class.as_manager()
else:
manager_class = import_string(manager_path)
yield mgr_name, manager_class(*args, **kwargs)
def clone(self):
"""Return an exact copy of this ModelState."""
return self.__class__(
app_label=self.app_label,
name=self.name,
fields=list(self.fields),
# Since options are shallow-copied here, operations such as
# AddIndex must replace their option (e.g 'indexes') rather
# than mutating it.
options=dict(self.options),
bases=self.bases,
managers=list(self.managers),
)
def render(self, apps):
"""Create a Model object from our current state into the given apps."""
# First, make a Meta object
meta_contents = {'app_label': self.app_label, 'apps': apps, **self.options}
meta = type("Meta", (), meta_contents)
# Then, work out our bases
try:
bases = tuple(
(apps.get_model(base) if isinstance(base, str) else base)
for base in self.bases
)
except LookupError:
raise InvalidBasesError("Cannot resolve one or more bases from %r" % (self.bases,))
# Turn fields into a dict for the body, add other bits
body = {name: field.clone() for name, field in self.fields}
body['Meta'] = meta
body['__module__'] = "__fake__"
# Restore managers
body.update(self.construct_managers())
# Then, make a Model object (apps.register_model is called in __new__)
return type(self.name, bases, body)
def get_field_by_name(self, name):
for fname, field in self.fields:
if fname == name:
return field
raise ValueError("No field called %s on model %s" % (name, self.name))
def get_index_by_name(self, name):
for index in self.options['indexes']:
if index.name == name:
return index
raise ValueError("No index named %s on model %s" % (name, self.name))
def get_constraint_by_name(self, name):
for constraint in self.options['constraints']:
if constraint.name == name:
return constraint
raise ValueError('No constraint named %s on model %s' % (name, self.name))
def __repr__(self):
return "<%s: '%s.%s'>" % (self.__class__.__name__, self.app_label, self.name)
def __eq__(self, other):
return (
(self.app_label == other.app_label) and
(self.name == other.name) and
(len(self.fields) == len(other.fields)) and
all((k1 == k2 and (f1.deconstruct()[1:] == f2.deconstruct()[1:]))
for (k1, f1), (k2, f2) in zip(self.fields, other.fields)) and
(self.options == other.options) and
(self.bases == other.bases) and
(self.managers == other.managers)
)
|
8dc9d01148bfd0cae0a98a1a253c3d2aee549084d3e669985699f3a1ac0369e1 | import pkgutil
import sys
from importlib import import_module, reload
from django.apps import apps
from django.conf import settings
from django.db.migrations.graph import MigrationGraph
from django.db.migrations.recorder import MigrationRecorder
from .exceptions import (
AmbiguityError, BadMigrationError, InconsistentMigrationHistory,
NodeNotFoundError,
)
MIGRATIONS_MODULE_NAME = 'migrations'
class MigrationLoader:
"""
Load migration files from disk and their status from the database.
Migration files are expected to live in the "migrations" directory of
an app. Their names are entirely unimportant from a code perspective,
but will probably follow the 1234_name.py convention.
On initialization, this class will scan those directories, and open and
read the Python files, looking for a class called Migration, which should
inherit from django.db.migrations.Migration. See
django.db.migrations.migration for what that looks like.
Some migrations will be marked as "replacing" another set of migrations.
These are loaded into a separate set of migrations away from the main ones.
If all the migrations they replace are either unapplied or missing from
disk, then they are injected into the main set, replacing the named migrations.
Any dependency pointers to the replaced migrations are re-pointed to the
new migration.
This does mean that this class MUST also talk to the database as well as
to disk, but this is probably fine. We're already not just operating
in memory.
"""
def __init__(self, connection, load=True, ignore_no_migrations=False):
self.connection = connection
self.disk_migrations = None
self.applied_migrations = None
self.ignore_no_migrations = ignore_no_migrations
if load:
self.build_graph()
@classmethod
def migrations_module(cls, app_label):
"""
Return the path to the migrations module for the specified app_label
and a boolean indicating if the module is specified in
settings.MIGRATION_MODULE.
"""
if app_label in settings.MIGRATION_MODULES:
return settings.MIGRATION_MODULES[app_label], True
else:
app_package_name = apps.get_app_config(app_label).name
return '%s.%s' % (app_package_name, MIGRATIONS_MODULE_NAME), False
def load_disk(self):
"""Load the migrations from all INSTALLED_APPS from disk."""
self.disk_migrations = {}
self.unmigrated_apps = set()
self.migrated_apps = set()
for app_config in apps.get_app_configs():
# Get the migrations module directory
module_name, explicit = self.migrations_module(app_config.label)
if module_name is None:
self.unmigrated_apps.add(app_config.label)
continue
was_loaded = module_name in sys.modules
try:
module = import_module(module_name)
except ImportError as e:
# I hate doing this, but I don't want to squash other import errors.
# Might be better to try a directory check directly.
if ((explicit and self.ignore_no_migrations) or (
not explicit and "No module named" in str(e) and MIGRATIONS_MODULE_NAME in str(e))):
self.unmigrated_apps.add(app_config.label)
continue
raise
else:
# Module is not a package (e.g. migrations.py).
if not hasattr(module, '__path__'):
self.unmigrated_apps.add(app_config.label)
continue
# Force a reload if it's already loaded (tests need this)
if was_loaded:
reload(module)
migration_names = {
name for _, name, is_pkg in pkgutil.iter_modules(module.__path__)
if not is_pkg and name[0] not in '_~'
}
if migration_names or self.ignore_no_migrations:
self.migrated_apps.add(app_config.label)
else:
self.unmigrated_apps.add(app_config.label)
# Load migrations
for migration_name in migration_names:
migration_path = '%s.%s' % (module_name, migration_name)
try:
migration_module = import_module(migration_path)
except ImportError as e:
if 'bad magic number' in str(e):
raise ImportError(
"Couldn't import %r as it appears to be a stale "
".pyc file." % migration_path
) from e
else:
raise
if not hasattr(migration_module, "Migration"):
raise BadMigrationError(
"Migration %s in app %s has no Migration class" % (migration_name, app_config.label)
)
self.disk_migrations[app_config.label, migration_name] = migration_module.Migration(
migration_name,
app_config.label,
)
def get_migration(self, app_label, name_prefix):
"""Return the named migration or raise NodeNotFoundError."""
return self.graph.nodes[app_label, name_prefix]
def get_migration_by_prefix(self, app_label, name_prefix):
"""
Return the migration(s) which match the given app label and name_prefix.
"""
# Do the search
results = []
for migration_app_label, migration_name in self.disk_migrations:
if migration_app_label == app_label and migration_name.startswith(name_prefix):
results.append((migration_app_label, migration_name))
if len(results) > 1:
raise AmbiguityError(
"There is more than one migration for '%s' with the prefix '%s'" % (app_label, name_prefix)
)
elif not results:
raise KeyError("There no migrations for '%s' with the prefix '%s'" % (app_label, name_prefix))
else:
return self.disk_migrations[results[0]]
def check_key(self, key, current_app):
if (key[1] != "__first__" and key[1] != "__latest__") or key in self.graph:
return key
# Special-case __first__, which means "the first migration" for
# migrated apps, and is ignored for unmigrated apps. It allows
# makemigrations to declare dependencies on apps before they even have
# migrations.
if key[0] == current_app:
# Ignore __first__ references to the same app (#22325)
return
if key[0] in self.unmigrated_apps:
# This app isn't migrated, but something depends on it.
# The models will get auto-added into the state, though
# so we're fine.
return
if key[0] in self.migrated_apps:
try:
if key[1] == "__first__":
return self.graph.root_nodes(key[0])[0]
else: # "__latest__"
return self.graph.leaf_nodes(key[0])[0]
except IndexError:
if self.ignore_no_migrations:
return None
else:
raise ValueError("Dependency on app with no migrations: %s" % key[0])
raise ValueError("Dependency on unknown app: %s" % key[0])
def add_internal_dependencies(self, key, migration):
"""
Internal dependencies need to be added first to ensure `__first__`
dependencies find the correct root node.
"""
for parent in migration.dependencies:
# Ignore __first__ references to the same app.
if parent[0] == key[0] and parent[1] != '__first__':
self.graph.add_dependency(migration, key, parent, skip_validation=True)
def add_external_dependencies(self, key, migration):
for parent in migration.dependencies:
# Skip internal dependencies
if key[0] == parent[0]:
continue
parent = self.check_key(parent, key[0])
if parent is not None:
self.graph.add_dependency(migration, key, parent, skip_validation=True)
for child in migration.run_before:
child = self.check_key(child, key[0])
if child is not None:
self.graph.add_dependency(migration, child, key, skip_validation=True)
def build_graph(self):
"""
Build a migration dependency graph using both the disk and database.
You'll need to rebuild the graph if you apply migrations. This isn't
usually a problem as generally migration stuff runs in a one-shot process.
"""
# Load disk data
self.load_disk()
# Load database data
if self.connection is None:
self.applied_migrations = {}
else:
recorder = MigrationRecorder(self.connection)
self.applied_migrations = recorder.applied_migrations()
# To start, populate the migration graph with nodes for ALL migrations
# and their dependencies. Also make note of replacing migrations at this step.
self.graph = MigrationGraph()
self.replacements = {}
for key, migration in self.disk_migrations.items():
self.graph.add_node(key, migration)
# Replacing migrations.
if migration.replaces:
self.replacements[key] = migration
for key, migration in self.disk_migrations.items():
# Internal (same app) dependencies.
self.add_internal_dependencies(key, migration)
# Add external dependencies now that the internal ones have been resolved.
for key, migration in self.disk_migrations.items():
self.add_external_dependencies(key, migration)
# Carry out replacements where possible.
for key, migration in self.replacements.items():
# Get applied status of each of this migration's replacement targets.
applied_statuses = [(target in self.applied_migrations) for target in migration.replaces]
# Ensure the replacing migration is only marked as applied if all of
# its replacement targets are.
if all(applied_statuses):
self.applied_migrations[key] = migration
else:
self.applied_migrations.pop(key, None)
# A replacing migration can be used if either all or none of its
# replacement targets have been applied.
if all(applied_statuses) or (not any(applied_statuses)):
self.graph.remove_replaced_nodes(key, migration.replaces)
else:
# This replacing migration cannot be used because it is partially applied.
# Remove it from the graph and remap dependencies to it (#25945).
self.graph.remove_replacement_node(key, migration.replaces)
# Ensure the graph is consistent.
try:
self.graph.validate_consistency()
except NodeNotFoundError as exc:
# Check if the missing node could have been replaced by any squash
# migration but wasn't because the squash migration was partially
# applied before. In that case raise a more understandable exception
# (#23556).
# Get reverse replacements.
reverse_replacements = {}
for key, migration in self.replacements.items():
for replaced in migration.replaces:
reverse_replacements.setdefault(replaced, set()).add(key)
# Try to reraise exception with more detail.
if exc.node in reverse_replacements:
candidates = reverse_replacements.get(exc.node, set())
is_replaced = any(candidate in self.graph.nodes for candidate in candidates)
if not is_replaced:
tries = ', '.join('%s.%s' % c for c in candidates)
raise NodeNotFoundError(
"Migration {0} depends on nonexistent node ('{1}', '{2}'). "
"Django tried to replace migration {1}.{2} with any of [{3}] "
"but wasn't able to because some of the replaced migrations "
"are already applied.".format(
exc.origin, exc.node[0], exc.node[1], tries
),
exc.node
) from exc
raise
self.graph.ensure_not_cyclic()
def check_consistent_history(self, connection):
"""
Raise InconsistentMigrationHistory if any applied migrations have
unapplied dependencies.
"""
recorder = MigrationRecorder(connection)
applied = recorder.applied_migrations()
for migration in applied:
# If the migration is unknown, skip it.
if migration not in self.graph.nodes:
continue
for parent in self.graph.node_map[migration].parents:
if parent not in applied:
# Skip unapplied squashed migrations that have all of their
# `replaces` applied.
if parent in self.replacements:
if all(m in applied for m in self.replacements[parent].replaces):
continue
raise InconsistentMigrationHistory(
"Migration {}.{} is applied before its dependency "
"{}.{} on database '{}'.".format(
migration[0], migration[1], parent[0], parent[1],
connection.alias,
)
)
def detect_conflicts(self):
"""
Look through the loaded graph and detect any conflicts - apps
with more than one leaf migration. Return a dict of the app labels
that conflict with the migration names that conflict.
"""
seen_apps = {}
conflicting_apps = set()
for app_label, migration_name in self.graph.leaf_nodes():
if app_label in seen_apps:
conflicting_apps.add(app_label)
seen_apps.setdefault(app_label, set()).add(migration_name)
return {app_label: seen_apps[app_label] for app_label in conflicting_apps}
def project_state(self, nodes=None, at_end=True):
"""
Return a ProjectState object representing the most recent state
that the loaded migrations represent.
See graph.make_state() for the meaning of "nodes" and "at_end".
"""
return self.graph.make_state(nodes=nodes, at_end=at_end, real_apps=list(self.unmigrated_apps))
|
6c14753855e094a5823ad4ad27d718e48ee2d94022cb146ab7c871dd793d0687 | from django.apps.registry import Apps
from django.db import DatabaseError, models
from django.utils.functional import classproperty
from django.utils.timezone import now
from .exceptions import MigrationSchemaMissing
class MigrationRecorder:
"""
Deal with storing migration records in the database.
Because this table is actually itself used for dealing with model
creation, it's the one thing we can't do normally via migrations.
We manually handle table creation/schema updating (using schema backend)
and then have a floating model to do queries with.
If a migration is unapplied its row is removed from the table. Having
a row in the table always means a migration is applied.
"""
_migration_class = None
@classproperty
def Migration(cls):
"""
Lazy load to avoid AppRegistryNotReady if installed apps import
MigrationRecorder.
"""
if cls._migration_class is None:
class Migration(models.Model):
app = models.CharField(max_length=255)
name = models.CharField(max_length=255)
applied = models.DateTimeField(default=now)
class Meta:
apps = Apps()
app_label = 'migrations'
db_table = 'django_migrations'
def __str__(self):
return 'Migration %s for %s' % (self.name, self.app)
cls._migration_class = Migration
return cls._migration_class
def __init__(self, connection):
self.connection = connection
@property
def migration_qs(self):
return self.Migration.objects.using(self.connection.alias)
def has_table(self):
"""Return True if the django_migrations table exists."""
return self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor())
def ensure_schema(self):
"""Ensure the table exists and has the correct schema."""
# If the table's there, that's fine - we've never changed its schema
# in the codebase.
if self.has_table():
return
# Make the table
try:
with self.connection.schema_editor() as editor:
editor.create_model(self.Migration)
except DatabaseError as exc:
raise MigrationSchemaMissing("Unable to create the django_migrations table (%s)" % exc)
def applied_migrations(self):
"""
Return a dict mapping (app_name, migration_name) to Migration instances
for all applied migrations.
"""
if self.has_table():
return {(migration.app, migration.name): migration for migration in self.migration_qs}
else:
# If the django_migrations table doesn't exist, then no migrations
# are applied.
return {}
def record_applied(self, app, name):
"""Record that a migration was applied."""
self.ensure_schema()
self.migration_qs.create(app=app, name=name)
def record_unapplied(self, app, name):
"""Record that a migration was unapplied."""
self.ensure_schema()
self.migration_qs.filter(app=app, name=name).delete()
def flush(self):
"""Delete all migration records. Useful for testing migrations."""
self.migration_qs.all().delete()
|
09a188815137f903eeba0ada38d3e0d6cef8dafe98769b27f6709b4f53706e6d | """
The main QuerySet implementation. This provides the public API for the ORM.
"""
import copy
import operator
import warnings
from collections import namedtuple
from functools import lru_cache
from itertools import chain
from django.conf import settings
from django.core import exceptions
from django.db import (
DJANGO_VERSION_PICKLE_KEY, IntegrityError, NotSupportedError, connections,
router, transaction,
)
from django.db.models import AutoField, DateField, DateTimeField, sql
from django.db.models.constants import LOOKUP_SEP
from django.db.models.deletion import Collector
from django.db.models.expressions import Case, Expression, F, Value, When
from django.db.models.functions import Cast, Trunc
from django.db.models.query_utils import FilteredRelation, Q
from django.db.models.sql.constants import CURSOR, GET_ITERATOR_CHUNK_SIZE
from django.db.models.utils import resolve_callables
from django.utils import timezone
from django.utils.functional import cached_property, partition
from django.utils.version import get_version
# The maximum number of results to fetch in a get() query.
MAX_GET_RESULTS = 21
# The maximum number of items to display in a QuerySet.__repr__
REPR_OUTPUT_SIZE = 20
class BaseIterable:
def __init__(self, queryset, chunked_fetch=False, chunk_size=GET_ITERATOR_CHUNK_SIZE):
self.queryset = queryset
self.chunked_fetch = chunked_fetch
self.chunk_size = chunk_size
class ModelIterable(BaseIterable):
"""Iterable that yields a model instance for each row."""
def __iter__(self):
queryset = self.queryset
db = queryset.db
compiler = queryset.query.get_compiler(using=db)
# Execute the query. This will also fill compiler.select, klass_info,
# and annotations.
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
select, klass_info, annotation_col_map = (compiler.select, compiler.klass_info,
compiler.annotation_col_map)
model_cls = klass_info['model']
select_fields = klass_info['select_fields']
model_fields_start, model_fields_end = select_fields[0], select_fields[-1] + 1
init_list = [f[0].target.attname
for f in select[model_fields_start:model_fields_end]]
related_populators = get_related_populators(klass_info, select, db)
known_related_objects = [
(field, related_objs, operator.attrgetter(*[
field.attname
if from_field == 'self' else
queryset.model._meta.get_field(from_field).attname
for from_field in field.from_fields
])) for field, related_objs in queryset._known_related_objects.items()
]
for row in compiler.results_iter(results):
obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
for rel_populator in related_populators:
rel_populator.populate(row, obj)
if annotation_col_map:
for attr_name, col_pos in annotation_col_map.items():
setattr(obj, attr_name, row[col_pos])
# Add the known related objects to the model.
for field, rel_objs, rel_getter in known_related_objects:
# Avoid overwriting objects loaded by, e.g., select_related().
if field.is_cached(obj):
continue
rel_obj_id = rel_getter(obj)
try:
rel_obj = rel_objs[rel_obj_id]
except KeyError:
pass # May happen in qs1 | qs2 scenarios.
else:
setattr(obj, field.name, rel_obj)
yield obj
class ValuesIterable(BaseIterable):
"""
Iterable returned by QuerySet.values() that yields a dict for each row.
"""
def __iter__(self):
queryset = self.queryset
query = queryset.query
compiler = query.get_compiler(queryset.db)
# extra(select=...) cols are always at the start of the row.
names = [
*query.extra_select,
*query.values_select,
*query.annotation_select,
]
indexes = range(len(names))
for row in compiler.results_iter(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size):
yield {names[i]: row[i] for i in indexes}
class ValuesListIterable(BaseIterable):
"""
Iterable returned by QuerySet.values_list(flat=False) that yields a tuple
for each row.
"""
def __iter__(self):
queryset = self.queryset
query = queryset.query
compiler = query.get_compiler(queryset.db)
if queryset._fields:
# extra(select=...) cols are always at the start of the row.
names = [
*query.extra_select,
*query.values_select,
*query.annotation_select,
]
fields = [*queryset._fields, *(f for f in query.annotation_select if f not in queryset._fields)]
if fields != names:
# Reorder according to fields.
index_map = {name: idx for idx, name in enumerate(names)}
rowfactory = operator.itemgetter(*[index_map[f] for f in fields])
return map(
rowfactory,
compiler.results_iter(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
)
return compiler.results_iter(tuple_expected=True, chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
class NamedValuesListIterable(ValuesListIterable):
"""
Iterable returned by QuerySet.values_list(named=True) that yields a
namedtuple for each row.
"""
@staticmethod
@lru_cache()
def create_namedtuple_class(*names):
# Cache namedtuple() with @lru_cache() since it's too slow to be
# called for every QuerySet evaluation.
return namedtuple('Row', names)
def __iter__(self):
queryset = self.queryset
if queryset._fields:
names = queryset._fields
else:
query = queryset.query
names = [*query.extra_select, *query.values_select, *query.annotation_select]
tuple_class = self.create_namedtuple_class(*names)
new = tuple.__new__
for row in super().__iter__():
yield new(tuple_class, row)
class FlatValuesListIterable(BaseIterable):
"""
Iterable returned by QuerySet.values_list(flat=True) that yields single
values.
"""
def __iter__(self):
queryset = self.queryset
compiler = queryset.query.get_compiler(queryset.db)
for row in compiler.results_iter(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size):
yield row[0]
class QuerySet:
"""Represent a lazy database lookup for a set of objects."""
def __init__(self, model=None, query=None, using=None, hints=None):
self.model = model
self._db = using
self._hints = hints or {}
self._query = query or sql.Query(self.model)
self._result_cache = None
self._sticky_filter = False
self._for_write = False
self._prefetch_related_lookups = ()
self._prefetch_done = False
self._known_related_objects = {} # {rel_field: {pk: rel_obj}}
self._iterable_class = ModelIterable
self._fields = None
self._defer_next_filter = False
self._deferred_filter = None
@property
def query(self):
if self._deferred_filter:
negate, args, kwargs = self._deferred_filter
self._filter_or_exclude_inplace(negate, *args, **kwargs)
self._deferred_filter = None
return self._query
@query.setter
def query(self, value):
self._query = value
def as_manager(cls):
# Address the circular dependency between `Queryset` and `Manager`.
from django.db.models.manager import Manager
manager = Manager.from_queryset(cls)()
manager._built_with_as_manager = True
return manager
as_manager.queryset_only = True
as_manager = classmethod(as_manager)
########################
# PYTHON MAGIC METHODS #
########################
def __deepcopy__(self, memo):
"""Don't populate the QuerySet's cache."""
obj = self.__class__()
for k, v in self.__dict__.items():
if k == '_result_cache':
obj.__dict__[k] = None
else:
obj.__dict__[k] = copy.deepcopy(v, memo)
return obj
def __getstate__(self):
# Force the cache to be fully populated.
self._fetch_all()
return {**self.__dict__, DJANGO_VERSION_PICKLE_KEY: get_version()}
def __setstate__(self, state):
msg = None
pickled_version = state.get(DJANGO_VERSION_PICKLE_KEY)
if pickled_version:
current_version = get_version()
if current_version != pickled_version:
msg = (
"Pickled queryset instance's Django version %s does not "
"match the current version %s." % (pickled_version, current_version)
)
else:
msg = "Pickled queryset instance's Django version is not specified."
if msg:
warnings.warn(msg, RuntimeWarning, stacklevel=2)
self.__dict__.update(state)
def __repr__(self):
data = list(self[:REPR_OUTPUT_SIZE + 1])
if len(data) > REPR_OUTPUT_SIZE:
data[-1] = "...(remaining elements truncated)..."
return '<%s %r>' % (self.__class__.__name__, data)
def __len__(self):
self._fetch_all()
return len(self._result_cache)
def __iter__(self):
"""
The queryset iterator protocol uses three nested iterators in the
default case:
1. sql.compiler.execute_sql()
- Returns 100 rows at time (constants.GET_ITERATOR_CHUNK_SIZE)
using cursor.fetchmany(). This part is responsible for
doing some column masking, and returning the rows in chunks.
2. sql.compiler.results_iter()
- Returns one row at time. At this point the rows are still just
tuples. In some cases the return values are converted to
Python values at this location.
3. self.iterator()
- Responsible for turning the rows into model objects.
"""
self._fetch_all()
return iter(self._result_cache)
def __bool__(self):
self._fetch_all()
return bool(self._result_cache)
def __getitem__(self, k):
"""Retrieve an item or slice from the set of results."""
if not isinstance(k, (int, slice)):
raise TypeError(
'QuerySet indices must be integers or slices, not %s.'
% type(k).__name__
)
assert ((not isinstance(k, slice) and (k >= 0)) or
(isinstance(k, slice) and (k.start is None or k.start >= 0) and
(k.stop is None or k.stop >= 0))), \
"Negative indexing is not supported."
if self._result_cache is not None:
return self._result_cache[k]
if isinstance(k, slice):
qs = self._chain()
if k.start is not None:
start = int(k.start)
else:
start = None
if k.stop is not None:
stop = int(k.stop)
else:
stop = None
qs.query.set_limits(start, stop)
return list(qs)[::k.step] if k.step else qs
qs = self._chain()
qs.query.set_limits(k, k + 1)
qs._fetch_all()
return qs._result_cache[0]
def __and__(self, other):
self._merge_sanity_check(other)
if isinstance(other, EmptyQuerySet):
return other
if isinstance(self, EmptyQuerySet):
return self
combined = self._chain()
combined._merge_known_related_objects(other)
combined.query.combine(other.query, sql.AND)
return combined
def __or__(self, other):
self._merge_sanity_check(other)
if isinstance(self, EmptyQuerySet):
return other
if isinstance(other, EmptyQuerySet):
return self
query = self if self.query.can_filter() else self.model._base_manager.filter(pk__in=self.values('pk'))
combined = query._chain()
combined._merge_known_related_objects(other)
if not other.query.can_filter():
other = other.model._base_manager.filter(pk__in=other.values('pk'))
combined.query.combine(other.query, sql.OR)
return combined
####################################
# METHODS THAT DO DATABASE QUERIES #
####################################
def _iterator(self, use_chunked_fetch, chunk_size):
yield from self._iterable_class(self, chunked_fetch=use_chunked_fetch, chunk_size=chunk_size)
def iterator(self, chunk_size=2000):
"""
An iterator over the results from applying this QuerySet to the
database.
"""
if chunk_size <= 0:
raise ValueError('Chunk size must be strictly positive.')
use_chunked_fetch = not connections[self.db].settings_dict.get('DISABLE_SERVER_SIDE_CURSORS')
return self._iterator(use_chunked_fetch, chunk_size)
def aggregate(self, *args, **kwargs):
"""
Return a dictionary containing the calculations (aggregation)
over the current queryset.
If args is present the expression is passed as a kwarg using
the Aggregate object's default alias.
"""
if self.query.distinct_fields:
raise NotImplementedError("aggregate() + distinct(fields) not implemented.")
self._validate_values_are_expressions((*args, *kwargs.values()), method_name='aggregate')
for arg in args:
# The default_alias property raises TypeError if default_alias
# can't be set automatically or AttributeError if it isn't an
# attribute.
try:
arg.default_alias
except (AttributeError, TypeError):
raise TypeError("Complex aggregates require an alias")
kwargs[arg.default_alias] = arg
query = self.query.chain()
for (alias, aggregate_expr) in kwargs.items():
query.add_annotation(aggregate_expr, alias, is_summary=True)
if not query.annotations[alias].contains_aggregate:
raise TypeError("%s is not an aggregate expression" % alias)
return query.get_aggregation(self.db, kwargs)
def count(self):
"""
Perform a SELECT COUNT() and return the number of records as an
integer.
If the QuerySet is already fully cached, return the length of the
cached results set to avoid multiple SELECT COUNT(*) calls.
"""
if self._result_cache is not None:
return len(self._result_cache)
return self.query.get_count(using=self.db)
def get(self, *args, **kwargs):
"""
Perform the query and return a single object matching the given
keyword arguments.
"""
clone = self._chain() if self.query.combinator else self.filter(*args, **kwargs)
if self.query.can_filter() and not self.query.distinct_fields:
clone = clone.order_by()
limit = None
if not clone.query.select_for_update or connections[clone.db].features.supports_select_for_update_with_limit:
limit = MAX_GET_RESULTS
clone.query.set_limits(high=limit)
num = len(clone)
if num == 1:
return clone._result_cache[0]
if not num:
raise self.model.DoesNotExist(
"%s matching query does not exist." %
self.model._meta.object_name
)
raise self.model.MultipleObjectsReturned(
'get() returned more than one %s -- it returned %s!' % (
self.model._meta.object_name,
num if not limit or num < limit else 'more than %s' % (limit - 1),
)
)
def create(self, **kwargs):
"""
Create a new object with the given kwargs, saving it to the database
and returning the created object.
"""
obj = self.model(**kwargs)
self._for_write = True
obj.save(force_insert=True, using=self.db)
return obj
def _populate_pk_values(self, objs):
for obj in objs:
if obj.pk is None:
obj.pk = obj._meta.pk.get_pk_value_on_save(obj)
def bulk_create(self, objs, batch_size=None, ignore_conflicts=False):
"""
Insert each of the instances into the database. Do *not* call
save() on each of the instances, do not send any pre/post_save
signals, and do not set the primary key attribute if it is an
autoincrement field (except if features.can_return_rows_from_bulk_insert=True).
Multi-table models are not supported.
"""
# When you bulk insert you don't get the primary keys back (if it's an
# autoincrement, except if can_return_rows_from_bulk_insert=True), so
# you can't insert into the child tables which references this. There
# are two workarounds:
# 1) This could be implemented if you didn't have an autoincrement pk
# 2) You could do it by doing O(n) normal inserts into the parent
# tables to get the primary keys back and then doing a single bulk
# insert into the childmost table.
# We currently set the primary keys on the objects when using
# PostgreSQL via the RETURNING ID clause. It should be possible for
# Oracle as well, but the semantics for extracting the primary keys is
# trickier so it's not done yet.
assert batch_size is None or batch_size > 0
# Check that the parents share the same concrete model with the our
# model to detect the inheritance pattern ConcreteGrandParent ->
# MultiTableParent -> ProxyChild. Simply checking self.model._meta.proxy
# would not identify that case as involving multiple tables.
for parent in self.model._meta.get_parent_list():
if parent._meta.concrete_model is not self.model._meta.concrete_model:
raise ValueError("Can't bulk create a multi-table inherited model")
if not objs:
return objs
self._for_write = True
connection = connections[self.db]
opts = self.model._meta
fields = opts.concrete_fields
objs = list(objs)
self._populate_pk_values(objs)
with transaction.atomic(using=self.db, savepoint=False):
objs_with_pk, objs_without_pk = partition(lambda o: o.pk is None, objs)
if objs_with_pk:
returned_columns = self._batched_insert(
objs_with_pk, fields, batch_size, ignore_conflicts=ignore_conflicts,
)
for obj_with_pk, results in zip(objs_with_pk, returned_columns):
for result, field in zip(results, opts.db_returning_fields):
if field != opts.pk:
setattr(obj_with_pk, field.attname, result)
for obj_with_pk in objs_with_pk:
obj_with_pk._state.adding = False
obj_with_pk._state.db = self.db
if objs_without_pk:
fields = [f for f in fields if not isinstance(f, AutoField)]
returned_columns = self._batched_insert(
objs_without_pk, fields, batch_size, ignore_conflicts=ignore_conflicts,
)
if connection.features.can_return_rows_from_bulk_insert and not ignore_conflicts:
assert len(returned_columns) == len(objs_without_pk)
for obj_without_pk, results in zip(objs_without_pk, returned_columns):
for result, field in zip(results, opts.db_returning_fields):
setattr(obj_without_pk, field.attname, result)
obj_without_pk._state.adding = False
obj_without_pk._state.db = self.db
return objs
def bulk_update(self, objs, fields, batch_size=None):
"""
Update the given fields in each of the given objects in the database.
"""
if batch_size is not None and batch_size < 0:
raise ValueError('Batch size must be a positive integer.')
if not fields:
raise ValueError('Field names must be given to bulk_update().')
objs = tuple(objs)
if any(obj.pk is None for obj in objs):
raise ValueError('All bulk_update() objects must have a primary key set.')
fields = [self.model._meta.get_field(name) for name in fields]
if any(not f.concrete or f.many_to_many for f in fields):
raise ValueError('bulk_update() can only be used with concrete fields.')
if any(f.primary_key for f in fields):
raise ValueError('bulk_update() cannot be used with primary key fields.')
if not objs:
return
# PK is used twice in the resulting update query, once in the filter
# and once in the WHEN. Each field will also have one CAST.
max_batch_size = connections[self.db].ops.bulk_batch_size(['pk', 'pk'] + fields, objs)
batch_size = min(batch_size, max_batch_size) if batch_size else max_batch_size
requires_casting = connections[self.db].features.requires_casted_case_in_updates
batches = (objs[i:i + batch_size] for i in range(0, len(objs), batch_size))
updates = []
for batch_objs in batches:
update_kwargs = {}
for field in fields:
when_statements = []
for obj in batch_objs:
attr = getattr(obj, field.attname)
if not isinstance(attr, Expression):
attr = Value(attr, output_field=field)
when_statements.append(When(pk=obj.pk, then=attr))
case_statement = Case(*when_statements, output_field=field)
if requires_casting:
case_statement = Cast(case_statement, output_field=field)
update_kwargs[field.attname] = case_statement
updates.append(([obj.pk for obj in batch_objs], update_kwargs))
with transaction.atomic(using=self.db, savepoint=False):
for pks, update_kwargs in updates:
self.filter(pk__in=pks).update(**update_kwargs)
bulk_update.alters_data = True
def get_or_create(self, defaults=None, **kwargs):
"""
Look up an object with the given kwargs, creating one if necessary.
Return a tuple of (object, created), where created is a boolean
specifying whether an object was created.
"""
# The get() needs to be targeted at the write database in order
# to avoid potential transaction consistency problems.
self._for_write = True
try:
return self.get(**kwargs), False
except self.model.DoesNotExist:
params = self._extract_model_params(defaults, **kwargs)
return self._create_object_from_params(kwargs, params)
def update_or_create(self, defaults=None, **kwargs):
"""
Look up an object with the given kwargs, updating one with defaults
if it exists, otherwise create a new one.
Return a tuple (object, created), where created is a boolean
specifying whether an object was created.
"""
defaults = defaults or {}
self._for_write = True
with transaction.atomic(using=self.db):
try:
obj = self.select_for_update().get(**kwargs)
except self.model.DoesNotExist:
params = self._extract_model_params(defaults, **kwargs)
# Lock the row so that a concurrent update is blocked until
# after update_or_create() has performed its save.
obj, created = self._create_object_from_params(kwargs, params, lock=True)
if created:
return obj, created
for k, v in resolve_callables(defaults):
setattr(obj, k, v)
obj.save(using=self.db)
return obj, False
def _create_object_from_params(self, lookup, params, lock=False):
"""
Try to create an object using passed params. Used by get_or_create()
and update_or_create().
"""
try:
with transaction.atomic(using=self.db):
params = dict(resolve_callables(params))
obj = self.create(**params)
return obj, True
except IntegrityError:
try:
qs = self.select_for_update() if lock else self
return qs.get(**lookup), False
except self.model.DoesNotExist:
pass
raise
def _extract_model_params(self, defaults, **kwargs):
"""
Prepare `params` for creating a model instance based on the given
kwargs; for use by get_or_create() and update_or_create().
"""
defaults = defaults or {}
params = {k: v for k, v in kwargs.items() if LOOKUP_SEP not in k}
params.update(defaults)
property_names = self.model._meta._property_names
invalid_params = []
for param in params:
try:
self.model._meta.get_field(param)
except exceptions.FieldDoesNotExist:
# It's okay to use a model's property if it has a setter.
if not (param in property_names and getattr(self.model, param).fset):
invalid_params.append(param)
if invalid_params:
raise exceptions.FieldError(
"Invalid field name(s) for model %s: '%s'." % (
self.model._meta.object_name,
"', '".join(sorted(invalid_params)),
))
return params
def _earliest(self, *fields):
"""
Return the earliest object according to fields (if given) or by the
model's Meta.get_latest_by.
"""
if fields:
order_by = fields
else:
order_by = getattr(self.model._meta, 'get_latest_by')
if order_by and not isinstance(order_by, (tuple, list)):
order_by = (order_by,)
if order_by is None:
raise ValueError(
"earliest() and latest() require either fields as positional "
"arguments or 'get_latest_by' in the model's Meta."
)
assert not self.query.is_sliced, \
"Cannot change a query once a slice has been taken."
obj = self._chain()
obj.query.set_limits(high=1)
obj.query.clear_ordering(force_empty=True)
obj.query.add_ordering(*order_by)
return obj.get()
def earliest(self, *fields):
return self._earliest(*fields)
def latest(self, *fields):
return self.reverse()._earliest(*fields)
def first(self):
"""Return the first object of a query or None if no match is found."""
for obj in (self if self.ordered else self.order_by('pk'))[:1]:
return obj
def last(self):
"""Return the last object of a query or None if no match is found."""
for obj in (self.reverse() if self.ordered else self.order_by('-pk'))[:1]:
return obj
def in_bulk(self, id_list=None, *, field_name='pk'):
"""
Return a dictionary mapping each of the given IDs to the object with
that ID. If `id_list` isn't provided, evaluate the entire QuerySet.
"""
assert not self.query.is_sliced, \
"Cannot use 'limit' or 'offset' with in_bulk"
if field_name != 'pk' and not self.model._meta.get_field(field_name).unique:
raise ValueError("in_bulk()'s field_name must be a unique field but %r isn't." % field_name)
if id_list is not None:
if not id_list:
return {}
filter_key = '{}__in'.format(field_name)
batch_size = connections[self.db].features.max_query_params
id_list = tuple(id_list)
# If the database has a limit on the number of query parameters
# (e.g. SQLite), retrieve objects in batches if necessary.
if batch_size and batch_size < len(id_list):
qs = ()
for offset in range(0, len(id_list), batch_size):
batch = id_list[offset:offset + batch_size]
qs += tuple(self.filter(**{filter_key: batch}).order_by())
else:
qs = self.filter(**{filter_key: id_list}).order_by()
else:
qs = self._chain()
return {getattr(obj, field_name): obj for obj in qs}
def delete(self):
"""Delete the records in the current QuerySet."""
self._not_support_combined_queries('delete')
assert not self.query.is_sliced, \
"Cannot use 'limit' or 'offset' with delete."
if self._fields is not None:
raise TypeError("Cannot call delete() after .values() or .values_list()")
del_query = self._chain()
# The delete is actually 2 queries - one to find related objects,
# and one to delete. Make sure that the discovery of related
# objects is performed on the same database as the deletion.
del_query._for_write = True
# Disable non-supported fields.
del_query.query.select_for_update = False
del_query.query.select_related = False
del_query.query.clear_ordering(force_empty=True)
collector = Collector(using=del_query.db)
collector.collect(del_query)
deleted, _rows_count = collector.delete()
# Clear the result cache, in case this QuerySet gets reused.
self._result_cache = None
return deleted, _rows_count
delete.alters_data = True
delete.queryset_only = True
def _raw_delete(self, using):
"""
Delete objects found from the given queryset in single direct SQL
query. No signals are sent and there is no protection for cascades.
"""
query = self.query.clone()
query.__class__ = sql.DeleteQuery
cursor = query.get_compiler(using).execute_sql(CURSOR)
return cursor.rowcount if cursor else 0
_raw_delete.alters_data = True
def update(self, **kwargs):
"""
Update all elements in the current QuerySet, setting all the given
fields to the appropriate values.
"""
self._not_support_combined_queries('update')
assert not self.query.is_sliced, \
"Cannot update a query once a slice has been taken."
self._for_write = True
query = self.query.chain(sql.UpdateQuery)
query.add_update_values(kwargs)
# Clear any annotations so that they won't be present in subqueries.
query.annotations = {}
with transaction.mark_for_rollback_on_error(using=self.db):
rows = query.get_compiler(self.db).execute_sql(CURSOR)
self._result_cache = None
return rows
update.alters_data = True
def _update(self, values):
"""
A version of update() that accepts field objects instead of field names.
Used primarily for model saving and not intended for use by general
code (it requires too much poking around at model internals to be
useful at that level).
"""
assert not self.query.is_sliced, \
"Cannot update a query once a slice has been taken."
query = self.query.chain(sql.UpdateQuery)
query.add_update_fields(values)
# Clear any annotations so that they won't be present in subqueries.
query.annotations = {}
self._result_cache = None
return query.get_compiler(self.db).execute_sql(CURSOR)
_update.alters_data = True
_update.queryset_only = False
def exists(self):
if self._result_cache is None:
return self.query.has_results(using=self.db)
return bool(self._result_cache)
def _prefetch_related_objects(self):
# This method can only be called once the result cache has been filled.
prefetch_related_objects(self._result_cache, *self._prefetch_related_lookups)
self._prefetch_done = True
def explain(self, *, format=None, **options):
return self.query.explain(using=self.db, format=format, **options)
##################################################
# PUBLIC METHODS THAT RETURN A QUERYSET SUBCLASS #
##################################################
def raw(self, raw_query, params=None, translations=None, using=None):
if using is None:
using = self.db
qs = RawQuerySet(raw_query, model=self.model, params=params, translations=translations, using=using)
qs._prefetch_related_lookups = self._prefetch_related_lookups[:]
return qs
def _values(self, *fields, **expressions):
clone = self._chain()
if expressions:
clone = clone.annotate(**expressions)
clone._fields = fields
clone.query.set_values(fields)
return clone
def values(self, *fields, **expressions):
fields += tuple(expressions)
clone = self._values(*fields, **expressions)
clone._iterable_class = ValuesIterable
return clone
def values_list(self, *fields, flat=False, named=False):
if flat and named:
raise TypeError("'flat' and 'named' can't be used together.")
if flat and len(fields) > 1:
raise TypeError("'flat' is not valid when values_list is called with more than one field.")
field_names = {f for f in fields if not hasattr(f, 'resolve_expression')}
_fields = []
expressions = {}
counter = 1
for field in fields:
if hasattr(field, 'resolve_expression'):
field_id_prefix = getattr(field, 'default_alias', field.__class__.__name__.lower())
while True:
field_id = field_id_prefix + str(counter)
counter += 1
if field_id not in field_names:
break
expressions[field_id] = field
_fields.append(field_id)
else:
_fields.append(field)
clone = self._values(*_fields, **expressions)
clone._iterable_class = (
NamedValuesListIterable if named
else FlatValuesListIterable if flat
else ValuesListIterable
)
return clone
def dates(self, field_name, kind, order='ASC'):
"""
Return a list of date objects representing all available dates for
the given field_name, scoped to 'kind'.
"""
assert kind in ('year', 'month', 'week', 'day'), \
"'kind' must be one of 'year', 'month', 'week', or 'day'."
assert order in ('ASC', 'DESC'), \
"'order' must be either 'ASC' or 'DESC'."
return self.annotate(
datefield=Trunc(field_name, kind, output_field=DateField()),
plain_field=F(field_name)
).values_list(
'datefield', flat=True
).distinct().filter(plain_field__isnull=False).order_by(('-' if order == 'DESC' else '') + 'datefield')
def datetimes(self, field_name, kind, order='ASC', tzinfo=None):
"""
Return a list of datetime objects representing all available
datetimes for the given field_name, scoped to 'kind'.
"""
assert kind in ('year', 'month', 'week', 'day', 'hour', 'minute', 'second'), \
"'kind' must be one of 'year', 'month', 'week', 'day', 'hour', 'minute', or 'second'."
assert order in ('ASC', 'DESC'), \
"'order' must be either 'ASC' or 'DESC'."
if settings.USE_TZ:
if tzinfo is None:
tzinfo = timezone.get_current_timezone()
else:
tzinfo = None
return self.annotate(
datetimefield=Trunc(field_name, kind, output_field=DateTimeField(), tzinfo=tzinfo),
plain_field=F(field_name)
).values_list(
'datetimefield', flat=True
).distinct().filter(plain_field__isnull=False).order_by(('-' if order == 'DESC' else '') + 'datetimefield')
def none(self):
"""Return an empty QuerySet."""
clone = self._chain()
clone.query.set_empty()
return clone
##################################################################
# PUBLIC METHODS THAT ALTER ATTRIBUTES AND RETURN A NEW QUERYSET #
##################################################################
def all(self):
"""
Return a new QuerySet that is a copy of the current one. This allows a
QuerySet to proxy for a model manager in some cases.
"""
return self._chain()
def filter(self, *args, **kwargs):
"""
Return a new QuerySet instance with the args ANDed to the existing
set.
"""
self._not_support_combined_queries('filter')
return self._filter_or_exclude(False, *args, **kwargs)
def exclude(self, *args, **kwargs):
"""
Return a new QuerySet instance with NOT (args) ANDed to the existing
set.
"""
self._not_support_combined_queries('exclude')
return self._filter_or_exclude(True, *args, **kwargs)
def _filter_or_exclude(self, negate, *args, **kwargs):
if args or kwargs:
assert not self.query.is_sliced, \
"Cannot filter a query once a slice has been taken."
clone = self._chain()
if self._defer_next_filter:
self._defer_next_filter = False
clone._deferred_filter = negate, args, kwargs
else:
clone._filter_or_exclude_inplace(negate, *args, **kwargs)
return clone
def _filter_or_exclude_inplace(self, negate, *args, **kwargs):
if negate:
self._query.add_q(~Q(*args, **kwargs))
else:
self._query.add_q(Q(*args, **kwargs))
def complex_filter(self, filter_obj):
"""
Return a new QuerySet instance with filter_obj added to the filters.
filter_obj can be a Q object or a dictionary of keyword lookup
arguments.
This exists to support framework features such as 'limit_choices_to',
and usually it will be more natural to use other methods.
"""
if isinstance(filter_obj, Q):
clone = self._chain()
clone.query.add_q(filter_obj)
return clone
else:
return self._filter_or_exclude(False, **filter_obj)
def _combinator_query(self, combinator, *other_qs, all=False):
# Clone the query to inherit the select list and everything
clone = self._chain()
# Clear limits and ordering so they can be reapplied
clone.query.clear_ordering(True)
clone.query.clear_limits()
clone.query.combined_queries = (self.query,) + tuple(qs.query for qs in other_qs)
clone.query.combinator = combinator
clone.query.combinator_all = all
return clone
def union(self, *other_qs, all=False):
# If the query is an EmptyQuerySet, combine all nonempty querysets.
if isinstance(self, EmptyQuerySet):
qs = [q for q in other_qs if not isinstance(q, EmptyQuerySet)]
return qs[0]._combinator_query('union', *qs[1:], all=all) if qs else self
return self._combinator_query('union', *other_qs, all=all)
def intersection(self, *other_qs):
# If any query is an EmptyQuerySet, return it.
if isinstance(self, EmptyQuerySet):
return self
for other in other_qs:
if isinstance(other, EmptyQuerySet):
return other
return self._combinator_query('intersection', *other_qs)
def difference(self, *other_qs):
# If the query is an EmptyQuerySet, return it.
if isinstance(self, EmptyQuerySet):
return self
return self._combinator_query('difference', *other_qs)
def select_for_update(self, nowait=False, skip_locked=False, of=()):
"""
Return a new QuerySet instance that will select objects with a
FOR UPDATE lock.
"""
if nowait and skip_locked:
raise ValueError('The nowait option cannot be used with skip_locked.')
obj = self._chain()
obj._for_write = True
obj.query.select_for_update = True
obj.query.select_for_update_nowait = nowait
obj.query.select_for_update_skip_locked = skip_locked
obj.query.select_for_update_of = of
return obj
def select_related(self, *fields):
"""
Return a new QuerySet instance that will select related objects.
If fields are specified, they must be ForeignKey fields and only those
related objects are included in the selection.
If select_related(None) is called, clear the list.
"""
self._not_support_combined_queries('select_related')
if self._fields is not None:
raise TypeError("Cannot call select_related() after .values() or .values_list()")
obj = self._chain()
if fields == (None,):
obj.query.select_related = False
elif fields:
obj.query.add_select_related(fields)
else:
obj.query.select_related = True
return obj
def prefetch_related(self, *lookups):
"""
Return a new QuerySet instance that will prefetch the specified
Many-To-One and Many-To-Many related objects when the QuerySet is
evaluated.
When prefetch_related() is called more than once, append to the list of
prefetch lookups. If prefetch_related(None) is called, clear the list.
"""
self._not_support_combined_queries('prefetch_related')
clone = self._chain()
if lookups == (None,):
clone._prefetch_related_lookups = ()
else:
for lookup in lookups:
if isinstance(lookup, Prefetch):
lookup = lookup.prefetch_to
lookup = lookup.split(LOOKUP_SEP, 1)[0]
if lookup in self.query._filtered_relations:
raise ValueError('prefetch_related() is not supported with FilteredRelation.')
clone._prefetch_related_lookups = clone._prefetch_related_lookups + lookups
return clone
def annotate(self, *args, **kwargs):
"""
Return a query set in which the returned objects have been annotated
with extra data or aggregations.
"""
self._not_support_combined_queries('annotate')
self._validate_values_are_expressions(args + tuple(kwargs.values()), method_name='annotate')
annotations = {}
for arg in args:
# The default_alias property may raise a TypeError.
try:
if arg.default_alias in kwargs:
raise ValueError("The named annotation '%s' conflicts with the "
"default name for another annotation."
% arg.default_alias)
except TypeError:
raise TypeError("Complex annotations require an alias")
annotations[arg.default_alias] = arg
annotations.update(kwargs)
clone = self._chain()
names = self._fields
if names is None:
names = set(chain.from_iterable(
(field.name, field.attname) if hasattr(field, 'attname') else (field.name,)
for field in self.model._meta.get_fields()
))
for alias, annotation in annotations.items():
if alias in names:
raise ValueError("The annotation '%s' conflicts with a field on "
"the model." % alias)
if isinstance(annotation, FilteredRelation):
clone.query.add_filtered_relation(annotation, alias)
else:
clone.query.add_annotation(annotation, alias, is_summary=False)
for alias, annotation in clone.query.annotations.items():
if alias in annotations and annotation.contains_aggregate:
if clone._fields is None:
clone.query.group_by = True
else:
clone.query.set_group_by()
break
return clone
def order_by(self, *field_names):
"""Return a new QuerySet instance with the ordering changed."""
assert not self.query.is_sliced, \
"Cannot reorder a query once a slice has been taken."
obj = self._chain()
obj.query.clear_ordering(force_empty=False)
obj.query.add_ordering(*field_names)
return obj
def distinct(self, *field_names):
"""
Return a new QuerySet instance that will select only distinct results.
"""
assert not self.query.is_sliced, \
"Cannot create distinct fields once a slice has been taken."
obj = self._chain()
obj.query.add_distinct_fields(*field_names)
return obj
def extra(self, select=None, where=None, params=None, tables=None,
order_by=None, select_params=None):
"""Add extra SQL fragments to the query."""
self._not_support_combined_queries('extra')
assert not self.query.is_sliced, \
"Cannot change a query once a slice has been taken"
clone = self._chain()
clone.query.add_extra(select, select_params, where, params, tables, order_by)
return clone
def reverse(self):
"""Reverse the ordering of the QuerySet."""
if self.query.is_sliced:
raise TypeError('Cannot reverse a query once a slice has been taken.')
clone = self._chain()
clone.query.standard_ordering = not clone.query.standard_ordering
return clone
def defer(self, *fields):
"""
Defer the loading of data for certain fields until they are accessed.
Add the set of deferred fields to any existing set of deferred fields.
The only exception to this is if None is passed in as the only
parameter, in which case removal all deferrals.
"""
self._not_support_combined_queries('defer')
if self._fields is not None:
raise TypeError("Cannot call defer() after .values() or .values_list()")
clone = self._chain()
if fields == (None,):
clone.query.clear_deferred_loading()
else:
clone.query.add_deferred_loading(fields)
return clone
def only(self, *fields):
"""
Essentially, the opposite of defer(). Only the fields passed into this
method and that are not already specified as deferred are loaded
immediately when the queryset is evaluated.
"""
self._not_support_combined_queries('only')
if self._fields is not None:
raise TypeError("Cannot call only() after .values() or .values_list()")
if fields == (None,):
# Can only pass None to defer(), not only(), as the rest option.
# That won't stop people trying to do this, so let's be explicit.
raise TypeError("Cannot pass None as an argument to only().")
for field in fields:
field = field.split(LOOKUP_SEP, 1)[0]
if field in self.query._filtered_relations:
raise ValueError('only() is not supported with FilteredRelation.')
clone = self._chain()
clone.query.add_immediate_loading(fields)
return clone
def using(self, alias):
"""Select which database this QuerySet should execute against."""
clone = self._chain()
clone._db = alias
return clone
###################################
# PUBLIC INTROSPECTION ATTRIBUTES #
###################################
@property
def ordered(self):
"""
Return True if the QuerySet is ordered -- i.e. has an order_by()
clause or a default ordering on the model (or is empty).
"""
if isinstance(self, EmptyQuerySet):
return True
if self.query.extra_order_by or self.query.order_by:
return True
elif self.query.default_ordering and self.query.get_meta().ordering:
return True
else:
return False
@property
def db(self):
"""Return the database used if this query is executed now."""
if self._for_write:
return self._db or router.db_for_write(self.model, **self._hints)
return self._db or router.db_for_read(self.model, **self._hints)
###################
# PRIVATE METHODS #
###################
def _insert(self, objs, fields, returning_fields=None, raw=False, using=None, ignore_conflicts=False):
"""
Insert a new record for the given model. This provides an interface to
the InsertQuery class and is how Model.save() is implemented.
"""
self._for_write = True
if using is None:
using = self.db
query = sql.InsertQuery(self.model, ignore_conflicts=ignore_conflicts)
query.insert_values(fields, objs, raw=raw)
return query.get_compiler(using=using).execute_sql(returning_fields)
_insert.alters_data = True
_insert.queryset_only = False
def _batched_insert(self, objs, fields, batch_size, ignore_conflicts=False):
"""
Helper method for bulk_create() to insert objs one batch at a time.
"""
if ignore_conflicts and not connections[self.db].features.supports_ignore_conflicts:
raise NotSupportedError('This database backend does not support ignoring conflicts.')
ops = connections[self.db].ops
max_batch_size = max(ops.bulk_batch_size(fields, objs), 1)
batch_size = min(batch_size, max_batch_size) if batch_size else max_batch_size
inserted_rows = []
bulk_return = connections[self.db].features.can_return_rows_from_bulk_insert
for item in [objs[i:i + batch_size] for i in range(0, len(objs), batch_size)]:
if bulk_return and not ignore_conflicts:
inserted_columns = self._insert(
item, fields=fields, using=self.db,
returning_fields=self.model._meta.db_returning_fields,
ignore_conflicts=ignore_conflicts,
)
if isinstance(inserted_columns, list):
inserted_rows.extend(inserted_columns)
else:
inserted_rows.append(inserted_columns)
else:
self._insert(item, fields=fields, using=self.db, ignore_conflicts=ignore_conflicts)
return inserted_rows
def _chain(self, **kwargs):
"""
Return a copy of the current QuerySet that's ready for another
operation.
"""
obj = self._clone()
if obj._sticky_filter:
obj.query.filter_is_sticky = True
obj._sticky_filter = False
obj.__dict__.update(kwargs)
return obj
def _clone(self):
"""
Return a copy of the current QuerySet. A lightweight alternative
to deepcopy().
"""
c = self.__class__(model=self.model, query=self.query.chain(), using=self._db, hints=self._hints)
c._sticky_filter = self._sticky_filter
c._for_write = self._for_write
c._prefetch_related_lookups = self._prefetch_related_lookups[:]
c._known_related_objects = self._known_related_objects
c._iterable_class = self._iterable_class
c._fields = self._fields
return c
def _fetch_all(self):
if self._result_cache is None:
self._result_cache = list(self._iterable_class(self))
if self._prefetch_related_lookups and not self._prefetch_done:
self._prefetch_related_objects()
def _next_is_sticky(self):
"""
Indicate that the next filter call and the one following that should
be treated as a single filter. This is only important when it comes to
determining when to reuse tables for many-to-many filters. Required so
that we can filter naturally on the results of related managers.
This doesn't return a clone of the current QuerySet (it returns
"self"). The method is only used internally and should be immediately
followed by a filter() that does create a clone.
"""
self._sticky_filter = True
return self
def _merge_sanity_check(self, other):
"""Check that two QuerySet classes may be merged."""
if self._fields is not None and (
set(self.query.values_select) != set(other.query.values_select) or
set(self.query.extra_select) != set(other.query.extra_select) or
set(self.query.annotation_select) != set(other.query.annotation_select)):
raise TypeError(
"Merging '%s' classes must involve the same values in each case."
% self.__class__.__name__
)
def _merge_known_related_objects(self, other):
"""
Keep track of all known related objects from either QuerySet instance.
"""
for field, objects in other._known_related_objects.items():
self._known_related_objects.setdefault(field, {}).update(objects)
def resolve_expression(self, *args, **kwargs):
if self._fields and len(self._fields) > 1:
# values() queryset can only be used as nested queries
# if they are set up to select only a single field.
raise TypeError('Cannot use multi-field values as a filter value.')
query = self.query.resolve_expression(*args, **kwargs)
query._db = self._db
return query
resolve_expression.queryset_only = True
def _add_hints(self, **hints):
"""
Update hinting information for use by routers. Add new key/values or
overwrite existing key/values.
"""
self._hints.update(hints)
def _has_filters(self):
"""
Check if this QuerySet has any filtering going on. This isn't
equivalent with checking if all objects are present in results, for
example, qs[1:]._has_filters() -> False.
"""
return self.query.has_filters()
@staticmethod
def _validate_values_are_expressions(values, method_name):
invalid_args = sorted(str(arg) for arg in values if not hasattr(arg, 'resolve_expression'))
if invalid_args:
raise TypeError(
'QuerySet.%s() received non-expression(s): %s.' % (
method_name,
', '.join(invalid_args),
)
)
def _not_support_combined_queries(self, operation_name):
if self.query.combinator:
raise NotSupportedError(
'Calling QuerySet.%s() after %s() is not supported.'
% (operation_name, self.query.combinator)
)
class InstanceCheckMeta(type):
def __instancecheck__(self, instance):
return isinstance(instance, QuerySet) and instance.query.is_empty()
class EmptyQuerySet(metaclass=InstanceCheckMeta):
"""
Marker class to checking if a queryset is empty by .none():
isinstance(qs.none(), EmptyQuerySet) -> True
"""
def __init__(self, *args, **kwargs):
raise TypeError("EmptyQuerySet can't be instantiated")
class RawQuerySet:
"""
Provide an iterator which converts the results of raw SQL queries into
annotated model instances.
"""
def __init__(self, raw_query, model=None, query=None, params=None,
translations=None, using=None, hints=None):
self.raw_query = raw_query
self.model = model
self._db = using
self._hints = hints or {}
self.query = query or sql.RawQuery(sql=raw_query, using=self.db, params=params)
self.params = params or ()
self.translations = translations or {}
self._result_cache = None
self._prefetch_related_lookups = ()
self._prefetch_done = False
def resolve_model_init_order(self):
"""Resolve the init field names and value positions."""
converter = connections[self.db].introspection.identifier_converter
model_init_fields = [f for f in self.model._meta.fields if converter(f.column) in self.columns]
annotation_fields = [(column, pos) for pos, column in enumerate(self.columns)
if column not in self.model_fields]
model_init_order = [self.columns.index(converter(f.column)) for f in model_init_fields]
model_init_names = [f.attname for f in model_init_fields]
return model_init_names, model_init_order, annotation_fields
def prefetch_related(self, *lookups):
"""Same as QuerySet.prefetch_related()"""
clone = self._clone()
if lookups == (None,):
clone._prefetch_related_lookups = ()
else:
clone._prefetch_related_lookups = clone._prefetch_related_lookups + lookups
return clone
def _prefetch_related_objects(self):
prefetch_related_objects(self._result_cache, *self._prefetch_related_lookups)
self._prefetch_done = True
def _clone(self):
"""Same as QuerySet._clone()"""
c = self.__class__(
self.raw_query, model=self.model, query=self.query, params=self.params,
translations=self.translations, using=self._db, hints=self._hints
)
c._prefetch_related_lookups = self._prefetch_related_lookups[:]
return c
def _fetch_all(self):
if self._result_cache is None:
self._result_cache = list(self.iterator())
if self._prefetch_related_lookups and not self._prefetch_done:
self._prefetch_related_objects()
def __len__(self):
self._fetch_all()
return len(self._result_cache)
def __bool__(self):
self._fetch_all()
return bool(self._result_cache)
def __iter__(self):
self._fetch_all()
return iter(self._result_cache)
def iterator(self):
# Cache some things for performance reasons outside the loop.
db = self.db
compiler = connections[db].ops.compiler('SQLCompiler')(
self.query, connections[db], db
)
query = iter(self.query)
try:
model_init_names, model_init_pos, annotation_fields = self.resolve_model_init_order()
if self.model._meta.pk.attname not in model_init_names:
raise exceptions.FieldDoesNotExist(
'Raw query must include the primary key'
)
model_cls = self.model
fields = [self.model_fields.get(c) for c in self.columns]
converters = compiler.get_converters([
f.get_col(f.model._meta.db_table) if f else None for f in fields
])
if converters:
query = compiler.apply_converters(query, converters)
for values in query:
# Associate fields to values
model_init_values = [values[pos] for pos in model_init_pos]
instance = model_cls.from_db(db, model_init_names, model_init_values)
if annotation_fields:
for column, pos in annotation_fields:
setattr(instance, column, values[pos])
yield instance
finally:
# Done iterating the Query. If it has its own cursor, close it.
if hasattr(self.query, 'cursor') and self.query.cursor:
self.query.cursor.close()
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self.query)
def __getitem__(self, k):
return list(self)[k]
@property
def db(self):
"""Return the database used if this query is executed now."""
return self._db or router.db_for_read(self.model, **self._hints)
def using(self, alias):
"""Select the database this RawQuerySet should execute against."""
return RawQuerySet(
self.raw_query, model=self.model,
query=self.query.chain(using=alias),
params=self.params, translations=self.translations,
using=alias,
)
@cached_property
def columns(self):
"""
A list of model field names in the order they'll appear in the
query results.
"""
columns = self.query.get_columns()
# Adjust any column names which don't match field names
for (query_name, model_name) in self.translations.items():
# Ignore translations for nonexistent column names
try:
index = columns.index(query_name)
except ValueError:
pass
else:
columns[index] = model_name
return columns
@cached_property
def model_fields(self):
"""A dict mapping column names to model field names."""
converter = connections[self.db].introspection.identifier_converter
model_fields = {}
for field in self.model._meta.fields:
name, column = field.get_attname_column()
model_fields[converter(column)] = field
return model_fields
class Prefetch:
def __init__(self, lookup, queryset=None, to_attr=None):
# `prefetch_through` is the path we traverse to perform the prefetch.
self.prefetch_through = lookup
# `prefetch_to` is the path to the attribute that stores the result.
self.prefetch_to = lookup
if queryset is not None and (
isinstance(queryset, RawQuerySet) or (
hasattr(queryset, '_iterable_class') and
not issubclass(queryset._iterable_class, ModelIterable)
)
):
raise ValueError(
'Prefetch querysets cannot use raw(), values(), and '
'values_list().'
)
if to_attr:
self.prefetch_to = LOOKUP_SEP.join(lookup.split(LOOKUP_SEP)[:-1] + [to_attr])
self.queryset = queryset
self.to_attr = to_attr
def __getstate__(self):
obj_dict = self.__dict__.copy()
if self.queryset is not None:
# Prevent the QuerySet from being evaluated
obj_dict['queryset'] = self.queryset._chain(
_result_cache=[],
_prefetch_done=True,
)
return obj_dict
def add_prefix(self, prefix):
self.prefetch_through = prefix + LOOKUP_SEP + self.prefetch_through
self.prefetch_to = prefix + LOOKUP_SEP + self.prefetch_to
def get_current_prefetch_to(self, level):
return LOOKUP_SEP.join(self.prefetch_to.split(LOOKUP_SEP)[:level + 1])
def get_current_to_attr(self, level):
parts = self.prefetch_to.split(LOOKUP_SEP)
to_attr = parts[level]
as_attr = self.to_attr and level == len(parts) - 1
return to_attr, as_attr
def get_current_queryset(self, level):
if self.get_current_prefetch_to(level) == self.prefetch_to:
return self.queryset
return None
def __eq__(self, other):
if not isinstance(other, Prefetch):
return NotImplemented
return self.prefetch_to == other.prefetch_to
def __hash__(self):
return hash((self.__class__, self.prefetch_to))
def normalize_prefetch_lookups(lookups, prefix=None):
"""Normalize lookups into Prefetch objects."""
ret = []
for lookup in lookups:
if not isinstance(lookup, Prefetch):
lookup = Prefetch(lookup)
if prefix:
lookup.add_prefix(prefix)
ret.append(lookup)
return ret
def prefetch_related_objects(model_instances, *related_lookups):
"""
Populate prefetched object caches for a list of model instances based on
the lookups/Prefetch instances given.
"""
if not model_instances:
return # nothing to do
# We need to be able to dynamically add to the list of prefetch_related
# lookups that we look up (see below). So we need some book keeping to
# ensure we don't do duplicate work.
done_queries = {} # dictionary of things like 'foo__bar': [results]
auto_lookups = set() # we add to this as we go through.
followed_descriptors = set() # recursion protection
all_lookups = normalize_prefetch_lookups(reversed(related_lookups))
while all_lookups:
lookup = all_lookups.pop()
if lookup.prefetch_to in done_queries:
if lookup.queryset is not None:
raise ValueError("'%s' lookup was already seen with a different queryset. "
"You may need to adjust the ordering of your lookups." % lookup.prefetch_to)
continue
# Top level, the list of objects to decorate is the result cache
# from the primary QuerySet. It won't be for deeper levels.
obj_list = model_instances
through_attrs = lookup.prefetch_through.split(LOOKUP_SEP)
for level, through_attr in enumerate(through_attrs):
# Prepare main instances
if not obj_list:
break
prefetch_to = lookup.get_current_prefetch_to(level)
if prefetch_to in done_queries:
# Skip any prefetching, and any object preparation
obj_list = done_queries[prefetch_to]
continue
# Prepare objects:
good_objects = True
for obj in obj_list:
# Since prefetching can re-use instances, it is possible to have
# the same instance multiple times in obj_list, so obj might
# already be prepared.
if not hasattr(obj, '_prefetched_objects_cache'):
try:
obj._prefetched_objects_cache = {}
except (AttributeError, TypeError):
# Must be an immutable object from
# values_list(flat=True), for example (TypeError) or
# a QuerySet subclass that isn't returning Model
# instances (AttributeError), either in Django or a 3rd
# party. prefetch_related() doesn't make sense, so quit.
good_objects = False
break
if not good_objects:
break
# Descend down tree
# We assume that objects retrieved are homogeneous (which is the premise
# of prefetch_related), so what applies to first object applies to all.
first_obj = obj_list[0]
to_attr = lookup.get_current_to_attr(level)[0]
prefetcher, descriptor, attr_found, is_fetched = get_prefetcher(first_obj, through_attr, to_attr)
if not attr_found:
raise AttributeError("Cannot find '%s' on %s object, '%s' is an invalid "
"parameter to prefetch_related()" %
(through_attr, first_obj.__class__.__name__, lookup.prefetch_through))
if level == len(through_attrs) - 1 and prefetcher is None:
# Last one, this *must* resolve to something that supports
# prefetching, otherwise there is no point adding it and the
# developer asking for it has made a mistake.
raise ValueError("'%s' does not resolve to an item that supports "
"prefetching - this is an invalid parameter to "
"prefetch_related()." % lookup.prefetch_through)
if prefetcher is not None and not is_fetched:
obj_list, additional_lookups = prefetch_one_level(obj_list, prefetcher, lookup, level)
# We need to ensure we don't keep adding lookups from the
# same relationships to stop infinite recursion. So, if we
# are already on an automatically added lookup, don't add
# the new lookups from relationships we've seen already.
if not (prefetch_to in done_queries and lookup in auto_lookups and descriptor in followed_descriptors):
done_queries[prefetch_to] = obj_list
new_lookups = normalize_prefetch_lookups(reversed(additional_lookups), prefetch_to)
auto_lookups.update(new_lookups)
all_lookups.extend(new_lookups)
followed_descriptors.add(descriptor)
else:
# Either a singly related object that has already been fetched
# (e.g. via select_related), or hopefully some other property
# that doesn't support prefetching but needs to be traversed.
# We replace the current list of parent objects with the list
# of related objects, filtering out empty or missing values so
# that we can continue with nullable or reverse relations.
new_obj_list = []
for obj in obj_list:
if through_attr in getattr(obj, '_prefetched_objects_cache', ()):
# If related objects have been prefetched, use the
# cache rather than the object's through_attr.
new_obj = list(obj._prefetched_objects_cache.get(through_attr))
else:
try:
new_obj = getattr(obj, through_attr)
except exceptions.ObjectDoesNotExist:
continue
if new_obj is None:
continue
# We special-case `list` rather than something more generic
# like `Iterable` because we don't want to accidentally match
# user models that define __iter__.
if isinstance(new_obj, list):
new_obj_list.extend(new_obj)
else:
new_obj_list.append(new_obj)
obj_list = new_obj_list
def get_prefetcher(instance, through_attr, to_attr):
"""
For the attribute 'through_attr' on the given instance, find
an object that has a get_prefetch_queryset().
Return a 4 tuple containing:
(the object with get_prefetch_queryset (or None),
the descriptor object representing this relationship (or None),
a boolean that is False if the attribute was not found at all,
a boolean that is True if the attribute has already been fetched)
"""
prefetcher = None
is_fetched = False
# For singly related objects, we have to avoid getting the attribute
# from the object, as this will trigger the query. So we first try
# on the class, in order to get the descriptor object.
rel_obj_descriptor = getattr(instance.__class__, through_attr, None)
if rel_obj_descriptor is None:
attr_found = hasattr(instance, through_attr)
else:
attr_found = True
if rel_obj_descriptor:
# singly related object, descriptor object has the
# get_prefetch_queryset() method.
if hasattr(rel_obj_descriptor, 'get_prefetch_queryset'):
prefetcher = rel_obj_descriptor
if rel_obj_descriptor.is_cached(instance):
is_fetched = True
else:
# descriptor doesn't support prefetching, so we go ahead and get
# the attribute on the instance rather than the class to
# support many related managers
rel_obj = getattr(instance, through_attr)
if hasattr(rel_obj, 'get_prefetch_queryset'):
prefetcher = rel_obj
if through_attr != to_attr:
# Special case cached_property instances because hasattr
# triggers attribute computation and assignment.
if isinstance(getattr(instance.__class__, to_attr, None), cached_property):
is_fetched = to_attr in instance.__dict__
else:
is_fetched = hasattr(instance, to_attr)
else:
is_fetched = through_attr in instance._prefetched_objects_cache
return prefetcher, rel_obj_descriptor, attr_found, is_fetched
def prefetch_one_level(instances, prefetcher, lookup, level):
"""
Helper function for prefetch_related_objects().
Run prefetches on all instances using the prefetcher object,
assigning results to relevant caches in instance.
Return the prefetched objects along with any additional prefetches that
must be done due to prefetch_related lookups found from default managers.
"""
# prefetcher must have a method get_prefetch_queryset() which takes a list
# of instances, and returns a tuple:
# (queryset of instances of self.model that are related to passed in instances,
# callable that gets value to be matched for returned instances,
# callable that gets value to be matched for passed in instances,
# boolean that is True for singly related objects,
# cache or field name to assign to,
# boolean that is True when the previous argument is a cache name vs a field name).
# The 'values to be matched' must be hashable as they will be used
# in a dictionary.
rel_qs, rel_obj_attr, instance_attr, single, cache_name, is_descriptor = (
prefetcher.get_prefetch_queryset(instances, lookup.get_current_queryset(level)))
# We have to handle the possibility that the QuerySet we just got back
# contains some prefetch_related lookups. We don't want to trigger the
# prefetch_related functionality by evaluating the query. Rather, we need
# to merge in the prefetch_related lookups.
# Copy the lookups in case it is a Prefetch object which could be reused
# later (happens in nested prefetch_related).
additional_lookups = [
copy.copy(additional_lookup) for additional_lookup
in getattr(rel_qs, '_prefetch_related_lookups', ())
]
if additional_lookups:
# Don't need to clone because the manager should have given us a fresh
# instance, so we access an internal instead of using public interface
# for performance reasons.
rel_qs._prefetch_related_lookups = ()
all_related_objects = list(rel_qs)
rel_obj_cache = {}
for rel_obj in all_related_objects:
rel_attr_val = rel_obj_attr(rel_obj)
rel_obj_cache.setdefault(rel_attr_val, []).append(rel_obj)
to_attr, as_attr = lookup.get_current_to_attr(level)
# Make sure `to_attr` does not conflict with a field.
if as_attr and instances:
# We assume that objects retrieved are homogeneous (which is the premise
# of prefetch_related), so what applies to first object applies to all.
model = instances[0].__class__
try:
model._meta.get_field(to_attr)
except exceptions.FieldDoesNotExist:
pass
else:
msg = 'to_attr={} conflicts with a field on the {} model.'
raise ValueError(msg.format(to_attr, model.__name__))
# Whether or not we're prefetching the last part of the lookup.
leaf = len(lookup.prefetch_through.split(LOOKUP_SEP)) - 1 == level
for obj in instances:
instance_attr_val = instance_attr(obj)
vals = rel_obj_cache.get(instance_attr_val, [])
if single:
val = vals[0] if vals else None
if as_attr:
# A to_attr has been given for the prefetch.
setattr(obj, to_attr, val)
elif is_descriptor:
# cache_name points to a field name in obj.
# This field is a descriptor for a related object.
setattr(obj, cache_name, val)
else:
# No to_attr has been given for this prefetch operation and the
# cache_name does not point to a descriptor. Store the value of
# the field in the object's field cache.
obj._state.fields_cache[cache_name] = val
else:
if as_attr:
setattr(obj, to_attr, vals)
else:
manager = getattr(obj, to_attr)
if leaf and lookup.queryset is not None:
qs = manager._apply_rel_filters(lookup.queryset)
else:
qs = manager.get_queryset()
qs._result_cache = vals
# We don't want the individual qs doing prefetch_related now,
# since we have merged this into the current work.
qs._prefetch_done = True
obj._prefetched_objects_cache[cache_name] = qs
return all_related_objects, additional_lookups
class RelatedPopulator:
"""
RelatedPopulator is used for select_related() object instantiation.
The idea is that each select_related() model will be populated by a
different RelatedPopulator instance. The RelatedPopulator instances get
klass_info and select (computed in SQLCompiler) plus the used db as
input for initialization. That data is used to compute which columns
to use, how to instantiate the model, and how to populate the links
between the objects.
The actual creation of the objects is done in populate() method. This
method gets row and from_obj as input and populates the select_related()
model instance.
"""
def __init__(self, klass_info, select, db):
self.db = db
# Pre-compute needed attributes. The attributes are:
# - model_cls: the possibly deferred model class to instantiate
# - either:
# - cols_start, cols_end: usually the columns in the row are
# in the same order model_cls.__init__ expects them, so we
# can instantiate by model_cls(*row[cols_start:cols_end])
# - reorder_for_init: When select_related descends to a child
# class, then we want to reuse the already selected parent
# data. However, in this case the parent data isn't necessarily
# in the same order that Model.__init__ expects it to be, so
# we have to reorder the parent data. The reorder_for_init
# attribute contains a function used to reorder the field data
# in the order __init__ expects it.
# - pk_idx: the index of the primary key field in the reordered
# model data. Used to check if a related object exists at all.
# - init_list: the field attnames fetched from the database. For
# deferred models this isn't the same as all attnames of the
# model's fields.
# - related_populators: a list of RelatedPopulator instances if
# select_related() descends to related models from this model.
# - local_setter, remote_setter: Methods to set cached values on
# the object being populated and on the remote object. Usually
# these are Field.set_cached_value() methods.
select_fields = klass_info['select_fields']
from_parent = klass_info['from_parent']
if not from_parent:
self.cols_start = select_fields[0]
self.cols_end = select_fields[-1] + 1
self.init_list = [
f[0].target.attname for f in select[self.cols_start:self.cols_end]
]
self.reorder_for_init = None
else:
attname_indexes = {select[idx][0].target.attname: idx for idx in select_fields}
model_init_attnames = (f.attname for f in klass_info['model']._meta.concrete_fields)
self.init_list = [attname for attname in model_init_attnames if attname in attname_indexes]
self.reorder_for_init = operator.itemgetter(*[attname_indexes[attname] for attname in self.init_list])
self.model_cls = klass_info['model']
self.pk_idx = self.init_list.index(self.model_cls._meta.pk.attname)
self.related_populators = get_related_populators(klass_info, select, self.db)
self.local_setter = klass_info['local_setter']
self.remote_setter = klass_info['remote_setter']
def populate(self, row, from_obj):
if self.reorder_for_init:
obj_data = self.reorder_for_init(row)
else:
obj_data = row[self.cols_start:self.cols_end]
if obj_data[self.pk_idx] is None:
obj = None
else:
obj = self.model_cls.from_db(self.db, self.init_list, obj_data)
for rel_iter in self.related_populators:
rel_iter.populate(row, obj)
self.local_setter(from_obj, obj)
if obj is not None:
self.remote_setter(obj, from_obj)
def get_related_populators(klass_info, select, db):
iterators = []
related_klass_infos = klass_info.get('related_klass_infos', [])
for rel_klass_info in related_klass_infos:
rel_cls = RelatedPopulator(rel_klass_info, select, db)
iterators.append(rel_cls)
return iterators
|
d752ab469825a4e9e4ce22b6a8e2eea8066a2a90aea58c47110cef2fd8a4b962 | from django.core.exceptions import ObjectDoesNotExist
from django.db.models import signals
from django.db.models.aggregates import * # NOQA
from django.db.models.aggregates import __all__ as aggregates_all
from django.db.models.constraints import * # NOQA
from django.db.models.constraints import __all__ as constraints_all
from django.db.models.deletion import (
CASCADE, DO_NOTHING, PROTECT, RESTRICT, SET, SET_DEFAULT, SET_NULL,
ProtectedError, RestrictedError,
)
from django.db.models.enums import * # NOQA
from django.db.models.enums import __all__ as enums_all
from django.db.models.expressions import (
Case, Exists, Expression, ExpressionList, ExpressionWrapper, F, Func,
OrderBy, OuterRef, RowRange, Subquery, Value, ValueRange, When, Window,
WindowFrame,
)
from django.db.models.fields import * # NOQA
from django.db.models.fields import __all__ as fields_all
from django.db.models.fields.files import FileField, ImageField
from django.db.models.fields.proxy import OrderWrt
from django.db.models.indexes import * # NOQA
from django.db.models.indexes import __all__ as indexes_all
from django.db.models.lookups import Lookup, Transform
from django.db.models.manager import Manager
from django.db.models.query import Prefetch, QuerySet, prefetch_related_objects
from django.db.models.query_utils import FilteredRelation, Q
# Imports that would create circular imports if sorted
from django.db.models.base import DEFERRED, Model # isort:skip
from django.db.models.fields.related import ( # isort:skip
ForeignKey, ForeignObject, OneToOneField, ManyToManyField,
ForeignObjectRel, ManyToOneRel, ManyToManyRel, OneToOneRel,
)
__all__ = aggregates_all + constraints_all + enums_all + fields_all + indexes_all
__all__ += [
'ObjectDoesNotExist', 'signals',
'CASCADE', 'DO_NOTHING', 'PROTECT', 'RESTRICT', 'SET', 'SET_DEFAULT',
'SET_NULL', 'ProtectedError', 'RestrictedError',
'Case', 'Exists', 'Expression', 'ExpressionList', 'ExpressionWrapper', 'F',
'Func', 'OrderBy', 'OuterRef', 'RowRange', 'Subquery', 'Value',
'ValueRange', 'When',
'Window', 'WindowFrame',
'FileField', 'ImageField', 'OrderWrt', 'Lookup', 'Transform', 'Manager',
'Prefetch', 'Q', 'QuerySet', 'prefetch_related_objects', 'DEFERRED', 'Model',
'FilteredRelation',
'ForeignKey', 'ForeignObject', 'OneToOneField', 'ManyToManyField',
'ForeignObjectRel', 'ManyToOneRel', 'ManyToManyRel', 'OneToOneRel',
]
|
a00946b4b6e2b8cabd468a6e38ad4facc3d3fceec00473b17d77150daf88c54d | import bisect
import copy
import inspect
from collections import defaultdict
from django.apps import apps
from django.conf import settings
from django.core.exceptions import FieldDoesNotExist
from django.db import connections
from django.db.models import AutoField, Manager, OrderWrt
from django.db.models.query_utils import PathInfo
from django.utils.datastructures import ImmutableList, OrderedSet
from django.utils.functional import cached_property
from django.utils.text import camel_case_to_spaces, format_lazy
from django.utils.translation import override
PROXY_PARENTS = object()
EMPTY_RELATION_TREE = ()
IMMUTABLE_WARNING = (
"The return type of '%s' should never be mutated. If you want to manipulate this list "
"for your own use, make a copy first."
)
DEFAULT_NAMES = (
'verbose_name', 'verbose_name_plural', 'db_table', 'ordering',
'unique_together', 'permissions', 'get_latest_by', 'order_with_respect_to',
'app_label', 'db_tablespace', 'abstract', 'managed', 'proxy', 'swappable',
'auto_created', 'index_together', 'apps', 'default_permissions',
'select_on_save', 'default_related_name', 'required_db_features',
'required_db_vendor', 'base_manager_name', 'default_manager_name',
'indexes', 'constraints',
)
def normalize_together(option_together):
"""
option_together can be either a tuple of tuples, or a single
tuple of two strings. Normalize it to a tuple of tuples, so that
calling code can uniformly expect that.
"""
try:
if not option_together:
return ()
if not isinstance(option_together, (tuple, list)):
raise TypeError
first_element = option_together[0]
if not isinstance(first_element, (tuple, list)):
option_together = (option_together,)
# Normalize everything to tuples
return tuple(tuple(ot) for ot in option_together)
except TypeError:
# If the value of option_together isn't valid, return it
# verbatim; this will be picked up by the check framework later.
return option_together
def make_immutable_fields_list(name, data):
return ImmutableList(data, warning=IMMUTABLE_WARNING % name)
class Options:
FORWARD_PROPERTIES = {
'fields', 'many_to_many', 'concrete_fields', 'local_concrete_fields',
'_forward_fields_map', 'managers', 'managers_map', 'base_manager',
'default_manager',
}
REVERSE_PROPERTIES = {'related_objects', 'fields_map', '_relation_tree'}
default_apps = apps
def __init__(self, meta, app_label=None):
self._get_fields_cache = {}
self.local_fields = []
self.local_many_to_many = []
self.private_fields = []
self.local_managers = []
self.base_manager_name = None
self.default_manager_name = None
self.model_name = None
self.verbose_name = None
self.verbose_name_plural = None
self.db_table = ''
self.ordering = []
self._ordering_clash = False
self.indexes = []
self.constraints = []
self.unique_together = []
self.index_together = []
self.select_on_save = False
self.default_permissions = ('add', 'change', 'delete', 'view')
self.permissions = []
self.object_name = None
self.app_label = app_label
self.get_latest_by = None
self.order_with_respect_to = None
self.db_tablespace = settings.DEFAULT_TABLESPACE
self.required_db_features = []
self.required_db_vendor = None
self.meta = meta
self.pk = None
self.auto_field = None
self.abstract = False
self.managed = True
self.proxy = False
# For any class that is a proxy (including automatically created
# classes for deferred object loading), proxy_for_model tells us
# which class this model is proxying. Note that proxy_for_model
# can create a chain of proxy models. For non-proxy models, the
# variable is always None.
self.proxy_for_model = None
# For any non-abstract class, the concrete class is the model
# in the end of the proxy_for_model chain. In particular, for
# concrete models, the concrete_model is always the class itself.
self.concrete_model = None
self.swappable = None
self.parents = {}
self.auto_created = False
# List of all lookups defined in ForeignKey 'limit_choices_to' options
# from *other* models. Needed for some admin checks. Internal use only.
self.related_fkey_lookups = []
# A custom app registry to use, if you're making a separate model set.
self.apps = self.default_apps
self.default_related_name = None
@property
def label(self):
return '%s.%s' % (self.app_label, self.object_name)
@property
def label_lower(self):
return '%s.%s' % (self.app_label, self.model_name)
@property
def app_config(self):
# Don't go through get_app_config to avoid triggering imports.
return self.apps.app_configs.get(self.app_label)
@property
def installed(self):
return self.app_config is not None
def contribute_to_class(self, cls, name):
from django.db import connection
from django.db.backends.utils import truncate_name
cls._meta = self
self.model = cls
# First, construct the default values for these options.
self.object_name = cls.__name__
self.model_name = self.object_name.lower()
self.verbose_name = camel_case_to_spaces(self.object_name)
# Store the original user-defined values for each option,
# for use when serializing the model definition
self.original_attrs = {}
# Next, apply any overridden values from 'class Meta'.
if self.meta:
meta_attrs = self.meta.__dict__.copy()
for name in self.meta.__dict__:
# Ignore any private attributes that Django doesn't care about.
# NOTE: We can't modify a dictionary's contents while looping
# over it, so we loop over the *original* dictionary instead.
if name.startswith('_'):
del meta_attrs[name]
for attr_name in DEFAULT_NAMES:
if attr_name in meta_attrs:
setattr(self, attr_name, meta_attrs.pop(attr_name))
self.original_attrs[attr_name] = getattr(self, attr_name)
elif hasattr(self.meta, attr_name):
setattr(self, attr_name, getattr(self.meta, attr_name))
self.original_attrs[attr_name] = getattr(self, attr_name)
self.unique_together = normalize_together(self.unique_together)
self.index_together = normalize_together(self.index_together)
# App label/class name interpolation for names of constraints and
# indexes.
if not getattr(cls._meta, 'abstract', False):
for attr_name in {'constraints', 'indexes'}:
objs = getattr(self, attr_name, [])
setattr(self, attr_name, self._format_names_with_class(cls, objs))
# verbose_name_plural is a special case because it uses a 's'
# by default.
if self.verbose_name_plural is None:
self.verbose_name_plural = format_lazy('{}s', self.verbose_name)
# order_with_respect_and ordering are mutually exclusive.
self._ordering_clash = bool(self.ordering and self.order_with_respect_to)
# Any leftover attributes must be invalid.
if meta_attrs != {}:
raise TypeError("'class Meta' got invalid attribute(s): %s" % ','.join(meta_attrs))
else:
self.verbose_name_plural = format_lazy('{}s', self.verbose_name)
del self.meta
# If the db_table wasn't provided, use the app_label + model_name.
if not self.db_table:
self.db_table = "%s_%s" % (self.app_label, self.model_name)
self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
def _format_names_with_class(self, cls, objs):
"""App label/class name interpolation for object names."""
new_objs = []
for obj in objs:
obj = obj.clone()
obj.name = obj.name % {
'app_label': cls._meta.app_label.lower(),
'class': cls.__name__.lower(),
}
new_objs.append(obj)
return new_objs
def _prepare(self, model):
if self.order_with_respect_to:
# The app registry will not be ready at this point, so we cannot
# use get_field().
query = self.order_with_respect_to
try:
self.order_with_respect_to = next(
f for f in self._get_fields(reverse=False)
if f.name == query or f.attname == query
)
except StopIteration:
raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, query))
self.ordering = ('_order',)
if not any(isinstance(field, OrderWrt) for field in model._meta.local_fields):
model.add_to_class('_order', OrderWrt())
else:
self.order_with_respect_to = None
if self.pk is None:
if self.parents:
# Promote the first parent link in lieu of adding yet another
# field.
field = next(iter(self.parents.values()))
# Look for a local field with the same name as the
# first parent link. If a local field has already been
# created, use it instead of promoting the parent
already_created = [fld for fld in self.local_fields if fld.name == field.name]
if already_created:
field = already_created[0]
field.primary_key = True
self.setup_pk(field)
else:
auto = AutoField(verbose_name='ID', primary_key=True, auto_created=True)
model.add_to_class('id', auto)
def add_manager(self, manager):
self.local_managers.append(manager)
self._expire_cache()
def add_field(self, field, private=False):
# Insert the given field in the order in which it was created, using
# the "creation_counter" attribute of the field.
# Move many-to-many related fields from self.fields into
# self.many_to_many.
if private:
self.private_fields.append(field)
elif field.is_relation and field.many_to_many:
bisect.insort(self.local_many_to_many, field)
else:
bisect.insort(self.local_fields, field)
self.setup_pk(field)
# If the field being added is a relation to another known field,
# expire the cache on this field and the forward cache on the field
# being referenced, because there will be new relationships in the
# cache. Otherwise, expire the cache of references *to* this field.
# The mechanism for getting at the related model is slightly odd -
# ideally, we'd just ask for field.related_model. However, related_model
# is a cached property, and all the models haven't been loaded yet, so
# we need to make sure we don't cache a string reference.
if field.is_relation and hasattr(field.remote_field, 'model') and field.remote_field.model:
try:
field.remote_field.model._meta._expire_cache(forward=False)
except AttributeError:
pass
self._expire_cache()
else:
self._expire_cache(reverse=False)
def setup_pk(self, field):
if not self.pk and field.primary_key:
self.pk = field
field.serialize = False
def setup_proxy(self, target):
"""
Do the internal setup so that the current model is a proxy for
"target".
"""
self.pk = target._meta.pk
self.proxy_for_model = target
self.db_table = target._meta.db_table
def __repr__(self):
return '<Options for %s>' % self.object_name
def __str__(self):
return self.label_lower
def can_migrate(self, connection):
"""
Return True if the model can/should be migrated on the `connection`.
`connection` can be either a real connection or a connection alias.
"""
if self.proxy or self.swapped or not self.managed:
return False
if isinstance(connection, str):
connection = connections[connection]
if self.required_db_vendor:
return self.required_db_vendor == connection.vendor
if self.required_db_features:
return all(getattr(connection.features, feat, False)
for feat in self.required_db_features)
return True
@property
def verbose_name_raw(self):
"""Return the untranslated verbose name."""
with override(None):
return str(self.verbose_name)
@property
def swapped(self):
"""
Has this model been swapped out for another? If so, return the model
name of the replacement; otherwise, return None.
For historical reasons, model name lookups using get_model() are
case insensitive, so we make sure we are case insensitive here.
"""
if self.swappable:
swapped_for = getattr(settings, self.swappable, None)
if swapped_for:
try:
swapped_label, swapped_object = swapped_for.split('.')
except ValueError:
# setting not in the format app_label.model_name
# raising ImproperlyConfigured here causes problems with
# test cleanup code - instead it is raised in get_user_model
# or as part of validation.
return swapped_for
if '%s.%s' % (swapped_label, swapped_object.lower()) != self.label_lower:
return swapped_for
return None
@cached_property
def managers(self):
managers = []
seen_managers = set()
bases = (b for b in self.model.mro() if hasattr(b, '_meta'))
for depth, base in enumerate(bases):
for manager in base._meta.local_managers:
if manager.name in seen_managers:
continue
manager = copy.copy(manager)
manager.model = self.model
seen_managers.add(manager.name)
managers.append((depth, manager.creation_counter, manager))
return make_immutable_fields_list(
"managers",
(m[2] for m in sorted(managers)),
)
@cached_property
def managers_map(self):
return {manager.name: manager for manager in self.managers}
@cached_property
def base_manager(self):
base_manager_name = self.base_manager_name
if not base_manager_name:
# Get the first parent's base_manager_name if there's one.
for parent in self.model.mro()[1:]:
if hasattr(parent, '_meta'):
if parent._base_manager.name != '_base_manager':
base_manager_name = parent._base_manager.name
break
if base_manager_name:
try:
return self.managers_map[base_manager_name]
except KeyError:
raise ValueError(
"%s has no manager named %r" % (
self.object_name,
base_manager_name,
)
)
manager = Manager()
manager.name = '_base_manager'
manager.model = self.model
manager.auto_created = True
return manager
@cached_property
def default_manager(self):
default_manager_name = self.default_manager_name
if not default_manager_name and not self.local_managers:
# Get the first parent's default_manager_name if there's one.
for parent in self.model.mro()[1:]:
if hasattr(parent, '_meta'):
default_manager_name = parent._meta.default_manager_name
break
if default_manager_name:
try:
return self.managers_map[default_manager_name]
except KeyError:
raise ValueError(
"%s has no manager named %r" % (
self.object_name,
default_manager_name,
)
)
if self.managers:
return self.managers[0]
@cached_property
def fields(self):
"""
Return a list of all forward fields on the model and its parents,
excluding ManyToManyFields.
Private API intended only to be used by Django itself; get_fields()
combined with filtering of field properties is the public API for
obtaining this field list.
"""
# For legacy reasons, the fields property should only contain forward
# fields that are not private or with a m2m cardinality. Therefore we
# pass these three filters as filters to the generator.
# The third lambda is a longwinded way of checking f.related_model - we don't
# use that property directly because related_model is a cached property,
# and all the models may not have been loaded yet; we don't want to cache
# the string reference to the related_model.
def is_not_an_m2m_field(f):
return not (f.is_relation and f.many_to_many)
def is_not_a_generic_relation(f):
return not (f.is_relation and f.one_to_many)
def is_not_a_generic_foreign_key(f):
return not (
f.is_relation and f.many_to_one and not (hasattr(f.remote_field, 'model') and f.remote_field.model)
)
return make_immutable_fields_list(
"fields",
(f for f in self._get_fields(reverse=False)
if is_not_an_m2m_field(f) and is_not_a_generic_relation(f) and is_not_a_generic_foreign_key(f))
)
@cached_property
def concrete_fields(self):
"""
Return a list of all concrete fields on the model and its parents.
Private API intended only to be used by Django itself; get_fields()
combined with filtering of field properties is the public API for
obtaining this field list.
"""
return make_immutable_fields_list(
"concrete_fields", (f for f in self.fields if f.concrete)
)
@cached_property
def local_concrete_fields(self):
"""
Return a list of all concrete fields on the model.
Private API intended only to be used by Django itself; get_fields()
combined with filtering of field properties is the public API for
obtaining this field list.
"""
return make_immutable_fields_list(
"local_concrete_fields", (f for f in self.local_fields if f.concrete)
)
@cached_property
def many_to_many(self):
"""
Return a list of all many to many fields on the model and its parents.
Private API intended only to be used by Django itself; get_fields()
combined with filtering of field properties is the public API for
obtaining this list.
"""
return make_immutable_fields_list(
"many_to_many",
(f for f in self._get_fields(reverse=False) if f.is_relation and f.many_to_many)
)
@cached_property
def related_objects(self):
"""
Return all related objects pointing to the current model. The related
objects can come from a one-to-one, one-to-many, or many-to-many field
relation type.
Private API intended only to be used by Django itself; get_fields()
combined with filtering of field properties is the public API for
obtaining this field list.
"""
all_related_fields = self._get_fields(forward=False, reverse=True, include_hidden=True)
return make_immutable_fields_list(
"related_objects",
(obj for obj in all_related_fields if not obj.hidden or obj.field.many_to_many)
)
@cached_property
def _forward_fields_map(self):
res = {}
fields = self._get_fields(reverse=False)
for field in fields:
res[field.name] = field
# Due to the way Django's internals work, get_field() should also
# be able to fetch a field by attname. In the case of a concrete
# field with relation, includes the *_id name too
try:
res[field.attname] = field
except AttributeError:
pass
return res
@cached_property
def fields_map(self):
res = {}
fields = self._get_fields(forward=False, include_hidden=True)
for field in fields:
res[field.name] = field
# Due to the way Django's internals work, get_field() should also
# be able to fetch a field by attname. In the case of a concrete
# field with relation, includes the *_id name too
try:
res[field.attname] = field
except AttributeError:
pass
return res
def get_field(self, field_name):
"""
Return a field instance given the name of a forward or reverse field.
"""
try:
# In order to avoid premature loading of the relation tree
# (expensive) we prefer checking if the field is a forward field.
return self._forward_fields_map[field_name]
except KeyError:
# If the app registry is not ready, reverse fields are
# unavailable, therefore we throw a FieldDoesNotExist exception.
if not self.apps.models_ready:
raise FieldDoesNotExist(
"%s has no field named '%s'. The app cache isn't ready yet, "
"so if this is an auto-created related field, it won't "
"be available yet." % (self.object_name, field_name)
)
try:
# Retrieve field instance by name from cached or just-computed
# field map.
return self.fields_map[field_name]
except KeyError:
raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, field_name))
def get_base_chain(self, model):
"""
Return a list of parent classes leading to `model` (ordered from
closest to most distant ancestor). This has to handle the case where
`model` is a grandparent or even more distant relation.
"""
if not self.parents:
return []
if model in self.parents:
return [model]
for parent in self.parents:
res = parent._meta.get_base_chain(model)
if res:
res.insert(0, parent)
return res
return []
def get_parent_list(self):
"""
Return all the ancestors of this model as a list ordered by MRO.
Useful for determining if something is an ancestor, regardless of lineage.
"""
result = OrderedSet(self.parents)
for parent in self.parents:
for ancestor in parent._meta.get_parent_list():
result.add(ancestor)
return list(result)
def get_ancestor_link(self, ancestor):
"""
Return the field on the current model which points to the given
"ancestor". This is possible an indirect link (a pointer to a parent
model, which points, eventually, to the ancestor). Used when
constructing table joins for model inheritance.
Return None if the model isn't an ancestor of this one.
"""
if ancestor in self.parents:
return self.parents[ancestor]
for parent in self.parents:
# Tries to get a link field from the immediate parent
parent_link = parent._meta.get_ancestor_link(ancestor)
if parent_link:
# In case of a proxied model, the first link
# of the chain to the ancestor is that parent
# links
return self.parents[parent] or parent_link
def get_path_to_parent(self, parent):
"""
Return a list of PathInfos containing the path from the current
model to the parent model, or an empty list if parent is not a
parent of the current model.
"""
if self.model is parent:
return []
# Skip the chain of proxy to the concrete proxied model.
proxied_model = self.concrete_model
path = []
opts = self
for int_model in self.get_base_chain(parent):
if int_model is proxied_model:
opts = int_model._meta
else:
final_field = opts.parents[int_model]
targets = (final_field.remote_field.get_related_field(),)
opts = int_model._meta
path.append(PathInfo(
from_opts=final_field.model._meta,
to_opts=opts,
target_fields=targets,
join_field=final_field,
m2m=False,
direct=True,
filtered_relation=None,
))
return path
def get_path_from_parent(self, parent):
"""
Return a list of PathInfos containing the path from the parent
model to the current model, or an empty list if parent is not a
parent of the current model.
"""
if self.model is parent:
return []
model = self.concrete_model
# Get a reversed base chain including both the current and parent
# models.
chain = model._meta.get_base_chain(parent)
chain.reverse()
chain.append(model)
# Construct a list of the PathInfos between models in chain.
path = []
for i, ancestor in enumerate(chain[:-1]):
child = chain[i + 1]
link = child._meta.get_ancestor_link(ancestor)
path.extend(link.get_reverse_path_info())
return path
def _populate_directed_relation_graph(self):
"""
This method is used by each model to find its reverse objects. As this
method is very expensive and is accessed frequently (it looks up every
field in a model, in every app), it is computed on first access and then
is set as a property on every model.
"""
related_objects_graph = defaultdict(list)
all_models = self.apps.get_models(include_auto_created=True)
for model in all_models:
opts = model._meta
# Abstract model's fields are copied to child models, hence we will
# see the fields from the child models.
if opts.abstract:
continue
fields_with_relations = (
f for f in opts._get_fields(reverse=False, include_parents=False)
if f.is_relation and f.related_model is not None
)
for f in fields_with_relations:
if not isinstance(f.remote_field.model, str):
related_objects_graph[f.remote_field.model._meta.concrete_model._meta].append(f)
for model in all_models:
# Set the relation_tree using the internal __dict__. In this way
# we avoid calling the cached property. In attribute lookup,
# __dict__ takes precedence over a data descriptor (such as
# @cached_property). This means that the _meta._relation_tree is
# only called if related_objects is not in __dict__.
related_objects = related_objects_graph[model._meta.concrete_model._meta]
model._meta.__dict__['_relation_tree'] = related_objects
# It seems it is possible that self is not in all_models, so guard
# against that with default for get().
return self.__dict__.get('_relation_tree', EMPTY_RELATION_TREE)
@cached_property
def _relation_tree(self):
return self._populate_directed_relation_graph()
def _expire_cache(self, forward=True, reverse=True):
# This method is usually called by apps.cache_clear(), when the
# registry is finalized, or when a new field is added.
if forward:
for cache_key in self.FORWARD_PROPERTIES:
if cache_key in self.__dict__:
delattr(self, cache_key)
if reverse and not self.abstract:
for cache_key in self.REVERSE_PROPERTIES:
if cache_key in self.__dict__:
delattr(self, cache_key)
self._get_fields_cache = {}
def get_fields(self, include_parents=True, include_hidden=False):
"""
Return a list of fields associated to the model. By default, include
forward and reverse fields, fields derived from inheritance, but not
hidden fields. The returned fields can be changed using the parameters:
- include_parents: include fields derived from inheritance
- include_hidden: include fields that have a related_name that
starts with a "+"
"""
if include_parents is False:
include_parents = PROXY_PARENTS
return self._get_fields(include_parents=include_parents, include_hidden=include_hidden)
def _get_fields(self, forward=True, reverse=True, include_parents=True, include_hidden=False,
seen_models=None):
"""
Internal helper function to return fields of the model.
* If forward=True, then fields defined on this model are returned.
* If reverse=True, then relations pointing to this model are returned.
* If include_hidden=True, then fields with is_hidden=True are returned.
* The include_parents argument toggles if fields from parent models
should be included. It has three values: True, False, and
PROXY_PARENTS. When set to PROXY_PARENTS, the call will return all
fields defined for the current model or any of its parents in the
parent chain to the model's concrete model.
"""
if include_parents not in (True, False, PROXY_PARENTS):
raise TypeError("Invalid argument for include_parents: %s" % (include_parents,))
# This helper function is used to allow recursion in ``get_fields()``
# implementation and to provide a fast way for Django's internals to
# access specific subsets of fields.
# We must keep track of which models we have already seen. Otherwise we
# could include the same field multiple times from different models.
topmost_call = seen_models is None
if topmost_call:
seen_models = set()
seen_models.add(self.model)
# Creates a cache key composed of all arguments
cache_key = (forward, reverse, include_parents, include_hidden, topmost_call)
try:
# In order to avoid list manipulation. Always return a shallow copy
# of the results.
return self._get_fields_cache[cache_key]
except KeyError:
pass
fields = []
# Recursively call _get_fields() on each parent, with the same
# options provided in this call.
if include_parents is not False:
for parent in self.parents:
# In diamond inheritance it is possible that we see the same
# model from two different routes. In that case, avoid adding
# fields from the same parent again.
if parent in seen_models:
continue
if (parent._meta.concrete_model != self.concrete_model and
include_parents == PROXY_PARENTS):
continue
for obj in parent._meta._get_fields(
forward=forward, reverse=reverse, include_parents=include_parents,
include_hidden=include_hidden, seen_models=seen_models):
if not getattr(obj, 'parent_link', False) or obj.model == self.concrete_model:
fields.append(obj)
if reverse and not self.proxy:
# Tree is computed once and cached until the app cache is expired.
# It is composed of a list of fields pointing to the current model
# from other models.
all_fields = self._relation_tree
for field in all_fields:
# If hidden fields should be included or the relation is not
# intentionally hidden, add to the fields dict.
if include_hidden or not field.remote_field.hidden:
fields.append(field.remote_field)
if forward:
fields += self.local_fields
fields += self.local_many_to_many
# Private fields are recopied to each child model, and they get a
# different model as field.model in each child. Hence we have to
# add the private fields separately from the topmost call. If we
# did this recursively similar to local_fields, we would get field
# instances with field.model != self.model.
if topmost_call:
fields += self.private_fields
# In order to avoid list manipulation. Always
# return a shallow copy of the results
fields = make_immutable_fields_list("get_fields()", fields)
# Store result into cache for later access
self._get_fields_cache[cache_key] = fields
return fields
@cached_property
def _property_names(self):
"""Return a set of the names of the properties defined on the model."""
names = []
for name in dir(self.model):
attr = inspect.getattr_static(self.model, name)
if isinstance(attr, property):
names.append(name)
return frozenset(names)
@cached_property
def db_returning_fields(self):
"""
Private API intended only to be used by Django itself.
Fields to be returned after a database insert.
"""
return [
field for field in self._get_fields(forward=True, reverse=False, include_parents=PROXY_PARENTS)
if getattr(field, 'db_returning', False)
]
|
9cb33f79e07896bff6f92b1c363d7122f4779b9f93bce31f9d4abc11d4950bff | import copy
import inspect
import warnings
from functools import partialmethod
from itertools import chain
from django.apps import apps
from django.conf import settings
from django.core import checks
from django.core.exceptions import (
NON_FIELD_ERRORS, FieldDoesNotExist, FieldError, MultipleObjectsReturned,
ObjectDoesNotExist, ValidationError,
)
from django.db import (
DEFAULT_DB_ALIAS, DJANGO_VERSION_PICKLE_KEY, DatabaseError, connection,
connections, router, transaction,
)
from django.db.models import (
NOT_PROVIDED, ExpressionWrapper, IntegerField, Max, Value,
)
from django.db.models.constants import LOOKUP_SEP
from django.db.models.constraints import CheckConstraint, UniqueConstraint
from django.db.models.deletion import CASCADE, Collector
from django.db.models.fields.related import (
ForeignObjectRel, OneToOneField, lazy_related_operation, resolve_relation,
)
from django.db.models.functions import Coalesce
from django.db.models.manager import Manager
from django.db.models.options import Options
from django.db.models.query import Q
from django.db.models.signals import (
class_prepared, post_init, post_save, pre_init, pre_save,
)
from django.db.models.utils import make_model_tuple
from django.utils.encoding import force_str
from django.utils.hashable import make_hashable
from django.utils.text import capfirst, get_text_list
from django.utils.translation import gettext_lazy as _
from django.utils.version import get_version
class Deferred:
def __repr__(self):
return '<Deferred field>'
def __str__(self):
return '<Deferred field>'
DEFERRED = Deferred()
def subclass_exception(name, bases, module, attached_to):
"""
Create exception subclass. Used by ModelBase below.
The exception is created in a way that allows it to be pickled, assuming
that the returned exception class will be added as an attribute to the
'attached_to' class.
"""
return type(name, bases, {
'__module__': module,
'__qualname__': '%s.%s' % (attached_to.__qualname__, name),
})
def _has_contribute_to_class(value):
# Only call contribute_to_class() if it's bound.
return not inspect.isclass(value) and hasattr(value, 'contribute_to_class')
class ModelBase(type):
"""Metaclass for all models."""
def __new__(cls, name, bases, attrs, **kwargs):
super_new = super().__new__
# Also ensure initialization is only performed for subclasses of Model
# (excluding Model class itself).
parents = [b for b in bases if isinstance(b, ModelBase)]
if not parents:
return super_new(cls, name, bases, attrs)
# Create the class.
module = attrs.pop('__module__')
new_attrs = {'__module__': module}
classcell = attrs.pop('__classcell__', None)
if classcell is not None:
new_attrs['__classcell__'] = classcell
attr_meta = attrs.pop('Meta', None)
# Pass all attrs without a (Django-specific) contribute_to_class()
# method to type.__new__() so that they're properly initialized
# (i.e. __set_name__()).
contributable_attrs = {}
for obj_name, obj in list(attrs.items()):
if _has_contribute_to_class(obj):
contributable_attrs[obj_name] = obj
else:
new_attrs[obj_name] = obj
new_class = super_new(cls, name, bases, new_attrs, **kwargs)
abstract = getattr(attr_meta, 'abstract', False)
meta = attr_meta or getattr(new_class, 'Meta', None)
base_meta = getattr(new_class, '_meta', None)
app_label = None
# Look for an application configuration to attach the model to.
app_config = apps.get_containing_app_config(module)
if getattr(meta, 'app_label', None) is None:
if app_config is None:
if not abstract:
raise RuntimeError(
"Model class %s.%s doesn't declare an explicit "
"app_label and isn't in an application in "
"INSTALLED_APPS." % (module, name)
)
else:
app_label = app_config.label
new_class.add_to_class('_meta', Options(meta, app_label))
if not abstract:
new_class.add_to_class(
'DoesNotExist',
subclass_exception(
'DoesNotExist',
tuple(
x.DoesNotExist for x in parents if hasattr(x, '_meta') and not x._meta.abstract
) or (ObjectDoesNotExist,),
module,
attached_to=new_class))
new_class.add_to_class(
'MultipleObjectsReturned',
subclass_exception(
'MultipleObjectsReturned',
tuple(
x.MultipleObjectsReturned for x in parents if hasattr(x, '_meta') and not x._meta.abstract
) or (MultipleObjectsReturned,),
module,
attached_to=new_class))
if base_meta and not base_meta.abstract:
# Non-abstract child classes inherit some attributes from their
# non-abstract parent (unless an ABC comes before it in the
# method resolution order).
if not hasattr(meta, 'ordering'):
new_class._meta.ordering = base_meta.ordering
if not hasattr(meta, 'get_latest_by'):
new_class._meta.get_latest_by = base_meta.get_latest_by
is_proxy = new_class._meta.proxy
# If the model is a proxy, ensure that the base class
# hasn't been swapped out.
if is_proxy and base_meta and base_meta.swapped:
raise TypeError("%s cannot proxy the swapped model '%s'." % (name, base_meta.swapped))
# Add remaining attributes (those with a contribute_to_class() method)
# to the class.
for obj_name, obj in contributable_attrs.items():
new_class.add_to_class(obj_name, obj)
# All the fields of any type declared on this model
new_fields = chain(
new_class._meta.local_fields,
new_class._meta.local_many_to_many,
new_class._meta.private_fields
)
field_names = {f.name for f in new_fields}
# Basic setup for proxy models.
if is_proxy:
base = None
for parent in [kls for kls in parents if hasattr(kls, '_meta')]:
if parent._meta.abstract:
if parent._meta.fields:
raise TypeError(
"Abstract base class containing model fields not "
"permitted for proxy model '%s'." % name
)
else:
continue
if base is None:
base = parent
elif parent._meta.concrete_model is not base._meta.concrete_model:
raise TypeError("Proxy model '%s' has more than one non-abstract model base class." % name)
if base is None:
raise TypeError("Proxy model '%s' has no non-abstract model base class." % name)
new_class._meta.setup_proxy(base)
new_class._meta.concrete_model = base._meta.concrete_model
else:
new_class._meta.concrete_model = new_class
# Collect the parent links for multi-table inheritance.
parent_links = {}
for base in reversed([new_class] + parents):
# Conceptually equivalent to `if base is Model`.
if not hasattr(base, '_meta'):
continue
# Skip concrete parent classes.
if base != new_class and not base._meta.abstract:
continue
# Locate OneToOneField instances.
for field in base._meta.local_fields:
if isinstance(field, OneToOneField) and field.remote_field.parent_link:
related = resolve_relation(new_class, field.remote_field.model)
parent_links[make_model_tuple(related)] = field
# Track fields inherited from base models.
inherited_attributes = set()
# Do the appropriate setup for any model parents.
for base in new_class.mro():
if base not in parents or not hasattr(base, '_meta'):
# Things without _meta aren't functional models, so they're
# uninteresting parents.
inherited_attributes.update(base.__dict__)
continue
parent_fields = base._meta.local_fields + base._meta.local_many_to_many
if not base._meta.abstract:
# Check for clashes between locally declared fields and those
# on the base classes.
for field in parent_fields:
if field.name in field_names:
raise FieldError(
'Local field %r in class %r clashes with field of '
'the same name from base class %r.' % (
field.name,
name,
base.__name__,
)
)
else:
inherited_attributes.add(field.name)
# Concrete classes...
base = base._meta.concrete_model
base_key = make_model_tuple(base)
if base_key in parent_links:
field = parent_links[base_key]
elif not is_proxy:
attr_name = '%s_ptr' % base._meta.model_name
field = OneToOneField(
base,
on_delete=CASCADE,
name=attr_name,
auto_created=True,
parent_link=True,
)
if attr_name in field_names:
raise FieldError(
"Auto-generated field '%s' in class %r for "
"parent_link to base class %r clashes with "
"declared field of the same name." % (
attr_name,
name,
base.__name__,
)
)
# Only add the ptr field if it's not already present;
# e.g. migrations will already have it specified
if not hasattr(new_class, attr_name):
new_class.add_to_class(attr_name, field)
else:
field = None
new_class._meta.parents[base] = field
else:
base_parents = base._meta.parents.copy()
# Add fields from abstract base class if it wasn't overridden.
for field in parent_fields:
if (field.name not in field_names and
field.name not in new_class.__dict__ and
field.name not in inherited_attributes):
new_field = copy.deepcopy(field)
new_class.add_to_class(field.name, new_field)
# Replace parent links defined on this base by the new
# field. It will be appropriately resolved if required.
if field.one_to_one:
for parent, parent_link in base_parents.items():
if field == parent_link:
base_parents[parent] = new_field
# Pass any non-abstract parent classes onto child.
new_class._meta.parents.update(base_parents)
# Inherit private fields (like GenericForeignKey) from the parent
# class
for field in base._meta.private_fields:
if field.name in field_names:
if not base._meta.abstract:
raise FieldError(
'Local field %r in class %r clashes with field of '
'the same name from base class %r.' % (
field.name,
name,
base.__name__,
)
)
else:
field = copy.deepcopy(field)
if not base._meta.abstract:
field.mti_inherited = True
new_class.add_to_class(field.name, field)
# Copy indexes so that index names are unique when models extend an
# abstract model.
new_class._meta.indexes = [copy.deepcopy(idx) for idx in new_class._meta.indexes]
if abstract:
# Abstract base models can't be instantiated and don't appear in
# the list of models for an app. We do the final setup for them a
# little differently from normal models.
attr_meta.abstract = False
new_class.Meta = attr_meta
return new_class
new_class._prepare()
new_class._meta.apps.register_model(new_class._meta.app_label, new_class)
return new_class
def add_to_class(cls, name, value):
if _has_contribute_to_class(value):
value.contribute_to_class(cls, name)
else:
setattr(cls, name, value)
def _prepare(cls):
"""Create some methods once self._meta has been populated."""
opts = cls._meta
opts._prepare(cls)
if opts.order_with_respect_to:
cls.get_next_in_order = partialmethod(cls._get_next_or_previous_in_order, is_next=True)
cls.get_previous_in_order = partialmethod(cls._get_next_or_previous_in_order, is_next=False)
# Defer creating accessors on the foreign class until it has been
# created and registered. If remote_field is None, we're ordering
# with respect to a GenericForeignKey and don't know what the
# foreign class is - we'll add those accessors later in
# contribute_to_class().
if opts.order_with_respect_to.remote_field:
wrt = opts.order_with_respect_to
remote = wrt.remote_field.model
lazy_related_operation(make_foreign_order_accessors, cls, remote)
# Give the class a docstring -- its definition.
if cls.__doc__ is None:
cls.__doc__ = "%s(%s)" % (cls.__name__, ", ".join(f.name for f in opts.fields))
get_absolute_url_override = settings.ABSOLUTE_URL_OVERRIDES.get(opts.label_lower)
if get_absolute_url_override:
setattr(cls, 'get_absolute_url', get_absolute_url_override)
if not opts.managers:
if any(f.name == 'objects' for f in opts.fields):
raise ValueError(
"Model %s must specify a custom Manager, because it has a "
"field named 'objects'." % cls.__name__
)
manager = Manager()
manager.auto_created = True
cls.add_to_class('objects', manager)
# Set the name of _meta.indexes. This can't be done in
# Options.contribute_to_class() because fields haven't been added to
# the model at that point.
for index in cls._meta.indexes:
if not index.name:
index.set_name_with_model(cls)
class_prepared.send(sender=cls)
@property
def _base_manager(cls):
return cls._meta.base_manager
@property
def _default_manager(cls):
return cls._meta.default_manager
class ModelStateFieldsCacheDescriptor:
def __get__(self, instance, cls=None):
if instance is None:
return self
res = instance.fields_cache = {}
return res
class ModelState:
"""Store model instance state."""
db = None
# If true, uniqueness validation checks will consider this a new, unsaved
# object. Necessary for correct validation of new instances of objects with
# explicit (non-auto) PKs. This impacts validation only; it has no effect
# on the actual save.
adding = True
fields_cache = ModelStateFieldsCacheDescriptor()
class Model(metaclass=ModelBase):
def __init__(self, *args, **kwargs):
# Alias some things as locals to avoid repeat global lookups
cls = self.__class__
opts = self._meta
_setattr = setattr
_DEFERRED = DEFERRED
pre_init.send(sender=cls, args=args, kwargs=kwargs)
# Set up the storage for instance state
self._state = ModelState()
# There is a rather weird disparity here; if kwargs, it's set, then args
# overrides it. It should be one or the other; don't duplicate the work
# The reason for the kwargs check is that standard iterator passes in by
# args, and instantiation for iteration is 33% faster.
if len(args) > len(opts.concrete_fields):
# Daft, but matches old exception sans the err msg.
raise IndexError("Number of args exceeds number of fields")
if not kwargs:
fields_iter = iter(opts.concrete_fields)
# The ordering of the zip calls matter - zip throws StopIteration
# when an iter throws it. So if the first iter throws it, the second
# is *not* consumed. We rely on this, so don't change the order
# without changing the logic.
for val, field in zip(args, fields_iter):
if val is _DEFERRED:
continue
_setattr(self, field.attname, val)
else:
# Slower, kwargs-ready version.
fields_iter = iter(opts.fields)
for val, field in zip(args, fields_iter):
if val is _DEFERRED:
continue
_setattr(self, field.attname, val)
kwargs.pop(field.name, None)
# Now we're left with the unprocessed fields that *must* come from
# keywords, or default.
for field in fields_iter:
is_related_object = False
# Virtual field
if field.attname not in kwargs and field.column is None:
continue
if kwargs:
if isinstance(field.remote_field, ForeignObjectRel):
try:
# Assume object instance was passed in.
rel_obj = kwargs.pop(field.name)
is_related_object = True
except KeyError:
try:
# Object instance wasn't passed in -- must be an ID.
val = kwargs.pop(field.attname)
except KeyError:
val = field.get_default()
else:
try:
val = kwargs.pop(field.attname)
except KeyError:
# This is done with an exception rather than the
# default argument on pop because we don't want
# get_default() to be evaluated, and then not used.
# Refs #12057.
val = field.get_default()
else:
val = field.get_default()
if is_related_object:
# If we are passed a related instance, set it using the
# field.name instead of field.attname (e.g. "user" instead of
# "user_id") so that the object gets properly cached (and type
# checked) by the RelatedObjectDescriptor.
if rel_obj is not _DEFERRED:
_setattr(self, field.name, rel_obj)
else:
if val is not _DEFERRED:
_setattr(self, field.attname, val)
if kwargs:
property_names = opts._property_names
for prop in tuple(kwargs):
try:
# Any remaining kwargs must correspond to properties or
# virtual fields.
if prop in property_names or opts.get_field(prop):
if kwargs[prop] is not _DEFERRED:
_setattr(self, prop, kwargs[prop])
del kwargs[prop]
except (AttributeError, FieldDoesNotExist):
pass
for kwarg in kwargs:
raise TypeError("%s() got an unexpected keyword argument '%s'" % (cls.__name__, kwarg))
super().__init__()
post_init.send(sender=cls, instance=self)
@classmethod
def from_db(cls, db, field_names, values):
if len(values) != len(cls._meta.concrete_fields):
values_iter = iter(values)
values = [
next(values_iter) if f.attname in field_names else DEFERRED
for f in cls._meta.concrete_fields
]
new = cls(*values)
new._state.adding = False
new._state.db = db
return new
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self)
def __str__(self):
return '%s object (%s)' % (self.__class__.__name__, self.pk)
def __eq__(self, other):
if not isinstance(other, Model):
return NotImplemented
if self._meta.concrete_model != other._meta.concrete_model:
return False
my_pk = self.pk
if my_pk is None:
return self is other
return my_pk == other.pk
def __hash__(self):
if self.pk is None:
raise TypeError("Model instances without primary key value are unhashable")
return hash(self.pk)
def __reduce__(self):
data = self.__getstate__()
data[DJANGO_VERSION_PICKLE_KEY] = get_version()
class_id = self._meta.app_label, self._meta.object_name
return model_unpickle, (class_id,), data
def __getstate__(self):
"""Hook to allow choosing the attributes to pickle."""
return self.__dict__
def __setstate__(self, state):
msg = None
pickled_version = state.get(DJANGO_VERSION_PICKLE_KEY)
if pickled_version:
current_version = get_version()
if current_version != pickled_version:
msg = (
"Pickled model instance's Django version %s does not match "
"the current version %s." % (pickled_version, current_version)
)
else:
msg = "Pickled model instance's Django version is not specified."
if msg:
warnings.warn(msg, RuntimeWarning, stacklevel=2)
self.__dict__.update(state)
def _get_pk_val(self, meta=None):
meta = meta or self._meta
return getattr(self, meta.pk.attname)
def _set_pk_val(self, value):
for parent_link in self._meta.parents.values():
if parent_link and parent_link != self._meta.pk:
setattr(self, parent_link.target_field.attname, value)
return setattr(self, self._meta.pk.attname, value)
pk = property(_get_pk_val, _set_pk_val)
def get_deferred_fields(self):
"""
Return a set containing names of deferred fields for this instance.
"""
return {
f.attname for f in self._meta.concrete_fields
if f.attname not in self.__dict__
}
def refresh_from_db(self, using=None, fields=None):
"""
Reload field values from the database.
By default, the reloading happens from the database this instance was
loaded from, or by the read router if this instance wasn't loaded from
any database. The using parameter will override the default.
Fields can be used to specify which fields to reload. The fields
should be an iterable of field attnames. If fields is None, then
all non-deferred fields are reloaded.
When accessing deferred fields of an instance, the deferred loading
of the field will call this method.
"""
if fields is None:
self._prefetched_objects_cache = {}
else:
prefetched_objects_cache = getattr(self, '_prefetched_objects_cache', ())
for field in fields:
if field in prefetched_objects_cache:
del prefetched_objects_cache[field]
fields.remove(field)
if not fields:
return
if any(LOOKUP_SEP in f for f in fields):
raise ValueError(
'Found "%s" in fields argument. Relations and transforms '
'are not allowed in fields.' % LOOKUP_SEP)
hints = {'instance': self}
db_instance_qs = self.__class__._base_manager.db_manager(using, hints=hints).filter(pk=self.pk)
# Use provided fields, if not set then reload all non-deferred fields.
deferred_fields = self.get_deferred_fields()
if fields is not None:
fields = list(fields)
db_instance_qs = db_instance_qs.only(*fields)
elif deferred_fields:
fields = [f.attname for f in self._meta.concrete_fields
if f.attname not in deferred_fields]
db_instance_qs = db_instance_qs.only(*fields)
db_instance = db_instance_qs.get()
non_loaded_fields = db_instance.get_deferred_fields()
for field in self._meta.concrete_fields:
if field.attname in non_loaded_fields:
# This field wasn't refreshed - skip ahead.
continue
setattr(self, field.attname, getattr(db_instance, field.attname))
# Clear cached foreign keys.
if field.is_relation and field.is_cached(self):
field.delete_cached_value(self)
# Clear cached relations.
for field in self._meta.related_objects:
if field.is_cached(self):
field.delete_cached_value(self)
self._state.db = db_instance._state.db
def serializable_value(self, field_name):
"""
Return the value of the field name for this instance. If the field is
a foreign key, return the id value instead of the object. If there's
no Field object with this name on the model, return the model
attribute's value.
Used to serialize a field's value (in the serializer, or form output,
for example). Normally, you would just access the attribute directly
and not use this method.
"""
try:
field = self._meta.get_field(field_name)
except FieldDoesNotExist:
return getattr(self, field_name)
return getattr(self, field.attname)
def save(self, force_insert=False, force_update=False, using=None,
update_fields=None):
"""
Save the current instance. Override this in a subclass if you want to
control the saving process.
The 'force_insert' and 'force_update' parameters can be used to insist
that the "save" must be an SQL insert or update (or equivalent for
non-SQL backends), respectively. Normally, they should not be set.
"""
# Ensure that a model instance without a PK hasn't been assigned to
# a ForeignKey or OneToOneField on this model. If the field is
# nullable, allowing the save() would result in silent data loss.
for field in self._meta.concrete_fields:
# If the related field isn't cached, then an instance hasn't
# been assigned and there's no need to worry about this check.
if field.is_relation and field.is_cached(self):
obj = getattr(self, field.name, None)
if not obj:
continue
# A pk may have been assigned manually to a model instance not
# saved to the database (or auto-generated in a case like
# UUIDField), but we allow the save to proceed and rely on the
# database to raise an IntegrityError if applicable. If
# constraints aren't supported by the database, there's the
# unavoidable risk of data corruption.
if obj.pk is None:
# Remove the object from a related instance cache.
if not field.remote_field.multiple:
field.remote_field.delete_cached_value(obj)
raise ValueError(
"save() prohibited to prevent data loss due to "
"unsaved related object '%s'." % field.name
)
elif getattr(self, field.attname) is None:
# Use pk from related object if it has been saved after
# an assignment.
setattr(self, field.attname, obj.pk)
# If the relationship's pk/to_field was changed, clear the
# cached relationship.
if getattr(obj, field.target_field.attname) != getattr(self, field.attname):
field.delete_cached_value(self)
using = using or router.db_for_write(self.__class__, instance=self)
if force_insert and (force_update or update_fields):
raise ValueError("Cannot force both insert and updating in model saving.")
deferred_fields = self.get_deferred_fields()
if update_fields is not None:
# If update_fields is empty, skip the save. We do also check for
# no-op saves later on for inheritance cases. This bailout is
# still needed for skipping signal sending.
if not update_fields:
return
update_fields = frozenset(update_fields)
field_names = set()
for field in self._meta.fields:
if not field.primary_key:
field_names.add(field.name)
if field.name != field.attname:
field_names.add(field.attname)
non_model_fields = update_fields.difference(field_names)
if non_model_fields:
raise ValueError("The following fields do not exist in this "
"model or are m2m fields: %s"
% ', '.join(non_model_fields))
# If saving to the same database, and this model is deferred, then
# automatically do an "update_fields" save on the loaded fields.
elif not force_insert and deferred_fields and using == self._state.db:
field_names = set()
for field in self._meta.concrete_fields:
if not field.primary_key and not hasattr(field, 'through'):
field_names.add(field.attname)
loaded_fields = field_names.difference(deferred_fields)
if loaded_fields:
update_fields = frozenset(loaded_fields)
self.save_base(using=using, force_insert=force_insert,
force_update=force_update, update_fields=update_fields)
save.alters_data = True
def save_base(self, raw=False, force_insert=False,
force_update=False, using=None, update_fields=None):
"""
Handle the parts of saving which should be done only once per save,
yet need to be done in raw saves, too. This includes some sanity
checks and signal sending.
The 'raw' argument is telling save_base not to save any parent
models and not to do any changes to the values before save. This
is used by fixture loading.
"""
using = using or router.db_for_write(self.__class__, instance=self)
assert not (force_insert and (force_update or update_fields))
assert update_fields is None or update_fields
cls = origin = self.__class__
# Skip proxies, but keep the origin as the proxy model.
if cls._meta.proxy:
cls = cls._meta.concrete_model
meta = cls._meta
if not meta.auto_created:
pre_save.send(
sender=origin, instance=self, raw=raw, using=using,
update_fields=update_fields,
)
# A transaction isn't needed if one query is issued.
if meta.parents:
context_manager = transaction.atomic(using=using, savepoint=False)
else:
context_manager = transaction.mark_for_rollback_on_error(using=using)
with context_manager:
parent_inserted = False
if not raw:
parent_inserted = self._save_parents(cls, using, update_fields)
updated = self._save_table(
raw, cls, force_insert or parent_inserted,
force_update, using, update_fields,
)
# Store the database on which the object was saved
self._state.db = using
# Once saved, this is no longer a to-be-added instance.
self._state.adding = False
# Signal that the save is complete
if not meta.auto_created:
post_save.send(
sender=origin, instance=self, created=(not updated),
update_fields=update_fields, raw=raw, using=using,
)
save_base.alters_data = True
def _save_parents(self, cls, using, update_fields):
"""Save all the parents of cls using values from self."""
meta = cls._meta
inserted = False
for parent, field in meta.parents.items():
# Make sure the link fields are synced between parent and self.
if (field and getattr(self, parent._meta.pk.attname) is None and
getattr(self, field.attname) is not None):
setattr(self, parent._meta.pk.attname, getattr(self, field.attname))
parent_inserted = self._save_parents(cls=parent, using=using, update_fields=update_fields)
updated = self._save_table(
cls=parent, using=using, update_fields=update_fields,
force_insert=parent_inserted,
)
if not updated:
inserted = True
# Set the parent's PK value to self.
if field:
setattr(self, field.attname, self._get_pk_val(parent._meta))
# Since we didn't have an instance of the parent handy set
# attname directly, bypassing the descriptor. Invalidate
# the related object cache, in case it's been accidentally
# populated. A fresh instance will be re-built from the
# database if necessary.
if field.is_cached(self):
field.delete_cached_value(self)
return inserted
def _save_table(self, raw=False, cls=None, force_insert=False,
force_update=False, using=None, update_fields=None):
"""
Do the heavy-lifting involved in saving. Update or insert the data
for a single table.
"""
meta = cls._meta
non_pks = [f for f in meta.local_concrete_fields if not f.primary_key]
if update_fields:
non_pks = [f for f in non_pks
if f.name in update_fields or f.attname in update_fields]
pk_val = self._get_pk_val(meta)
if pk_val is None:
pk_val = meta.pk.get_pk_value_on_save(self)
setattr(self, meta.pk.attname, pk_val)
pk_set = pk_val is not None
if not pk_set and (force_update or update_fields):
raise ValueError("Cannot force an update in save() with no primary key.")
updated = False
# Skip an UPDATE when adding an instance and primary key has a default.
if (
not raw and
not force_insert and
self._state.adding and
self._meta.pk.default and
self._meta.pk.default is not NOT_PROVIDED
):
force_insert = True
# If possible, try an UPDATE. If that doesn't update anything, do an INSERT.
if pk_set and not force_insert:
base_qs = cls._base_manager.using(using)
values = [(f, None, (getattr(self, f.attname) if raw else f.pre_save(self, False)))
for f in non_pks]
forced_update = update_fields or force_update
updated = self._do_update(base_qs, using, pk_val, values, update_fields,
forced_update)
if force_update and not updated:
raise DatabaseError("Forced update did not affect any rows.")
if update_fields and not updated:
raise DatabaseError("Save with update_fields did not affect any rows.")
if not updated:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
filter_args = field.get_filter_kwargs_for_object(self)
self._order = cls._base_manager.using(using).filter(**filter_args).aggregate(
_order__max=Coalesce(
ExpressionWrapper(Max('_order') + Value(1), output_field=IntegerField()),
Value(0),
),
)['_order__max']
fields = meta.local_concrete_fields
if not pk_set:
fields = [f for f in fields if f is not meta.auto_field]
returning_fields = meta.db_returning_fields
results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
for result, field in zip(results, returning_fields):
setattr(self, field.attname, result)
return updated
def _do_update(self, base_qs, using, pk_val, values, update_fields, forced_update):
"""
Try to update the model. Return True if the model was updated (if an
update query was done and a matching row was found in the DB).
"""
filtered = base_qs.filter(pk=pk_val)
if not values:
# We can end up here when saving a model in inheritance chain where
# update_fields doesn't target any field in current model. In that
# case we just say the update succeeded. Another case ending up here
# is a model with just PK - in that case check that the PK still
# exists.
return update_fields is not None or filtered.exists()
if self._meta.select_on_save and not forced_update:
return (
filtered.exists() and
# It may happen that the object is deleted from the DB right after
# this check, causing the subsequent UPDATE to return zero matching
# rows. The same result can occur in some rare cases when the
# database returns zero despite the UPDATE being executed
# successfully (a row is matched and updated). In order to
# distinguish these two cases, the object's existence in the
# database is again checked for if the UPDATE query returns 0.
(filtered._update(values) > 0 or filtered.exists())
)
return filtered._update(values) > 0
def _do_insert(self, manager, using, fields, returning_fields, raw):
"""
Do an INSERT. If returning_fields is defined then this method should
return the newly created data for the model.
"""
return manager._insert(
[self], fields=fields, returning_fields=returning_fields,
using=using, raw=raw,
)
def delete(self, using=None, keep_parents=False):
using = using or router.db_for_write(self.__class__, instance=self)
assert self.pk is not None, (
"%s object can't be deleted because its %s attribute is set to None." %
(self._meta.object_name, self._meta.pk.attname)
)
collector = Collector(using=using)
collector.collect([self], keep_parents=keep_parents)
return collector.delete()
delete.alters_data = True
def _get_FIELD_display(self, field):
value = getattr(self, field.attname)
choices_dict = dict(make_hashable(field.flatchoices))
# force_str() to coerce lazy strings.
return force_str(choices_dict.get(make_hashable(value), value), strings_only=True)
def _get_next_or_previous_by_FIELD(self, field, is_next, **kwargs):
if not self.pk:
raise ValueError("get_next/get_previous cannot be used on unsaved objects.")
op = 'gt' if is_next else 'lt'
order = '' if is_next else '-'
param = getattr(self, field.attname)
q = Q(**{'%s__%s' % (field.name, op): param})
q = q | Q(**{field.name: param, 'pk__%s' % op: self.pk})
qs = self.__class__._default_manager.using(self._state.db).filter(**kwargs).filter(q).order_by(
'%s%s' % (order, field.name), '%spk' % order
)
try:
return qs[0]
except IndexError:
raise self.DoesNotExist("%s matching query does not exist." % self.__class__._meta.object_name)
def _get_next_or_previous_in_order(self, is_next):
cachename = "__%s_order_cache" % is_next
if not hasattr(self, cachename):
op = 'gt' if is_next else 'lt'
order = '_order' if is_next else '-_order'
order_field = self._meta.order_with_respect_to
filter_args = order_field.get_filter_kwargs_for_object(self)
obj = self.__class__._default_manager.filter(**filter_args).filter(**{
'_order__%s' % op: self.__class__._default_manager.values('_order').filter(**{
self._meta.pk.name: self.pk
})
}).order_by(order)[:1].get()
setattr(self, cachename, obj)
return getattr(self, cachename)
def prepare_database_save(self, field):
if self.pk is None:
raise ValueError("Unsaved model instance %r cannot be used in an ORM query." % self)
return getattr(self, field.remote_field.get_related_field().attname)
def clean(self):
"""
Hook for doing any extra model-wide validation after clean() has been
called on every field by self.clean_fields. Any ValidationError raised
by this method will not be associated with a particular field; it will
have a special-case association with the field defined by NON_FIELD_ERRORS.
"""
pass
def validate_unique(self, exclude=None):
"""
Check unique constraints on the model and raise ValidationError if any
failed.
"""
unique_checks, date_checks = self._get_unique_checks(exclude=exclude)
errors = self._perform_unique_checks(unique_checks)
date_errors = self._perform_date_checks(date_checks)
for k, v in date_errors.items():
errors.setdefault(k, []).extend(v)
if errors:
raise ValidationError(errors)
def _get_unique_checks(self, exclude=None):
"""
Return a list of checks to perform. Since validate_unique() could be
called from a ModelForm, some fields may have been excluded; we can't
perform a unique check on a model that is missing fields involved
in that check. Fields that did not validate should also be excluded,
but they need to be passed in via the exclude argument.
"""
if exclude is None:
exclude = []
unique_checks = []
unique_togethers = [(self.__class__, self._meta.unique_together)]
constraints = [(self.__class__, self._meta.constraints)]
for parent_class in self._meta.get_parent_list():
if parent_class._meta.unique_together:
unique_togethers.append((parent_class, parent_class._meta.unique_together))
if parent_class._meta.constraints:
constraints.append((parent_class, parent_class._meta.constraints))
for model_class, unique_together in unique_togethers:
for check in unique_together:
if not any(name in exclude for name in check):
# Add the check if the field isn't excluded.
unique_checks.append((model_class, tuple(check)))
for model_class, model_constraints in constraints:
for constraint in model_constraints:
if (isinstance(constraint, UniqueConstraint) and
# Partial unique constraints can't be validated.
constraint.condition is None and
not any(name in exclude for name in constraint.fields)):
unique_checks.append((model_class, constraint.fields))
# These are checks for the unique_for_<date/year/month>.
date_checks = []
# Gather a list of checks for fields declared as unique and add them to
# the list of checks.
fields_with_class = [(self.__class__, self._meta.local_fields)]
for parent_class in self._meta.get_parent_list():
fields_with_class.append((parent_class, parent_class._meta.local_fields))
for model_class, fields in fields_with_class:
for f in fields:
name = f.name
if name in exclude:
continue
if f.unique:
unique_checks.append((model_class, (name,)))
if f.unique_for_date and f.unique_for_date not in exclude:
date_checks.append((model_class, 'date', name, f.unique_for_date))
if f.unique_for_year and f.unique_for_year not in exclude:
date_checks.append((model_class, 'year', name, f.unique_for_year))
if f.unique_for_month and f.unique_for_month not in exclude:
date_checks.append((model_class, 'month', name, f.unique_for_month))
return unique_checks, date_checks
def _perform_unique_checks(self, unique_checks):
errors = {}
for model_class, unique_check in unique_checks:
# Try to look up an existing object with the same values as this
# object's values for all the unique field.
lookup_kwargs = {}
for field_name in unique_check:
f = self._meta.get_field(field_name)
lookup_value = getattr(self, f.attname)
# TODO: Handle multiple backends with different feature flags.
if (lookup_value is None or
(lookup_value == '' and connection.features.interprets_empty_strings_as_nulls)):
# no value, skip the lookup
continue
if f.primary_key and not self._state.adding:
# no need to check for unique primary key when editing
continue
lookup_kwargs[str(field_name)] = lookup_value
# some fields were skipped, no reason to do the check
if len(unique_check) != len(lookup_kwargs):
continue
qs = model_class._default_manager.filter(**lookup_kwargs)
# Exclude the current object from the query if we are editing an
# instance (as opposed to creating a new one)
# Note that we need to use the pk as defined by model_class, not
# self.pk. These can be different fields because model inheritance
# allows single model to have effectively multiple primary keys.
# Refs #17615.
model_class_pk = self._get_pk_val(model_class._meta)
if not self._state.adding and model_class_pk is not None:
qs = qs.exclude(pk=model_class_pk)
if qs.exists():
if len(unique_check) == 1:
key = unique_check[0]
else:
key = NON_FIELD_ERRORS
errors.setdefault(key, []).append(self.unique_error_message(model_class, unique_check))
return errors
def _perform_date_checks(self, date_checks):
errors = {}
for model_class, lookup_type, field, unique_for in date_checks:
lookup_kwargs = {}
# there's a ticket to add a date lookup, we can remove this special
# case if that makes it's way in
date = getattr(self, unique_for)
if date is None:
continue
if lookup_type == 'date':
lookup_kwargs['%s__day' % unique_for] = date.day
lookup_kwargs['%s__month' % unique_for] = date.month
lookup_kwargs['%s__year' % unique_for] = date.year
else:
lookup_kwargs['%s__%s' % (unique_for, lookup_type)] = getattr(date, lookup_type)
lookup_kwargs[field] = getattr(self, field)
qs = model_class._default_manager.filter(**lookup_kwargs)
# Exclude the current object from the query if we are editing an
# instance (as opposed to creating a new one)
if not self._state.adding and self.pk is not None:
qs = qs.exclude(pk=self.pk)
if qs.exists():
errors.setdefault(field, []).append(
self.date_error_message(lookup_type, field, unique_for)
)
return errors
def date_error_message(self, lookup_type, field_name, unique_for):
opts = self._meta
field = opts.get_field(field_name)
return ValidationError(
message=field.error_messages['unique_for_date'],
code='unique_for_date',
params={
'model': self,
'model_name': capfirst(opts.verbose_name),
'lookup_type': lookup_type,
'field': field_name,
'field_label': capfirst(field.verbose_name),
'date_field': unique_for,
'date_field_label': capfirst(opts.get_field(unique_for).verbose_name),
}
)
def unique_error_message(self, model_class, unique_check):
opts = model_class._meta
params = {
'model': self,
'model_class': model_class,
'model_name': capfirst(opts.verbose_name),
'unique_check': unique_check,
}
# A unique field
if len(unique_check) == 1:
field = opts.get_field(unique_check[0])
params['field_label'] = capfirst(field.verbose_name)
return ValidationError(
message=field.error_messages['unique'],
code='unique',
params=params,
)
# unique_together
else:
field_labels = [capfirst(opts.get_field(f).verbose_name) for f in unique_check]
params['field_labels'] = get_text_list(field_labels, _('and'))
return ValidationError(
message=_("%(model_name)s with this %(field_labels)s already exists."),
code='unique_together',
params=params,
)
def full_clean(self, exclude=None, validate_unique=True):
"""
Call clean_fields(), clean(), and validate_unique() on the model.
Raise a ValidationError for any errors that occur.
"""
errors = {}
if exclude is None:
exclude = []
else:
exclude = list(exclude)
try:
self.clean_fields(exclude=exclude)
except ValidationError as e:
errors = e.update_error_dict(errors)
# Form.clean() is run even if other validation fails, so do the
# same with Model.clean() for consistency.
try:
self.clean()
except ValidationError as e:
errors = e.update_error_dict(errors)
# Run unique checks, but only for fields that passed validation.
if validate_unique:
for name in errors:
if name != NON_FIELD_ERRORS and name not in exclude:
exclude.append(name)
try:
self.validate_unique(exclude=exclude)
except ValidationError as e:
errors = e.update_error_dict(errors)
if errors:
raise ValidationError(errors)
def clean_fields(self, exclude=None):
"""
Clean all fields and raise a ValidationError containing a dict
of all validation errors if any occur.
"""
if exclude is None:
exclude = []
errors = {}
for f in self._meta.fields:
if f.name in exclude:
continue
# Skip validation for empty fields with blank=True. The developer
# is responsible for making sure they have a valid value.
raw_value = getattr(self, f.attname)
if f.blank and raw_value in f.empty_values:
continue
try:
setattr(self, f.attname, f.clean(raw_value, self))
except ValidationError as e:
errors[f.name] = e.error_list
if errors:
raise ValidationError(errors)
@classmethod
def check(cls, **kwargs):
errors = [*cls._check_swappable(), *cls._check_model(), *cls._check_managers(**kwargs)]
if not cls._meta.swapped:
errors += [
*cls._check_fields(**kwargs),
*cls._check_m2m_through_same_relationship(),
*cls._check_long_column_names(),
]
clash_errors = (
*cls._check_id_field(),
*cls._check_field_name_clashes(),
*cls._check_model_name_db_lookup_clashes(),
*cls._check_property_name_related_field_accessor_clashes(),
*cls._check_single_primary_key(),
)
errors.extend(clash_errors)
# If there are field name clashes, hide consequent column name
# clashes.
if not clash_errors:
errors.extend(cls._check_column_name_clashes())
errors += [
*cls._check_index_together(),
*cls._check_unique_together(),
*cls._check_indexes(),
*cls._check_ordering(),
*cls._check_constraints(),
]
return errors
@classmethod
def _check_swappable(cls):
"""Check if the swapped model exists."""
errors = []
if cls._meta.swapped:
try:
apps.get_model(cls._meta.swapped)
except ValueError:
errors.append(
checks.Error(
"'%s' is not of the form 'app_label.app_name'." % cls._meta.swappable,
id='models.E001',
)
)
except LookupError:
app_label, model_name = cls._meta.swapped.split('.')
errors.append(
checks.Error(
"'%s' references '%s.%s', which has not been "
"installed, or is abstract." % (
cls._meta.swappable, app_label, model_name
),
id='models.E002',
)
)
return errors
@classmethod
def _check_model(cls):
errors = []
if cls._meta.proxy:
if cls._meta.local_fields or cls._meta.local_many_to_many:
errors.append(
checks.Error(
"Proxy model '%s' contains model fields." % cls.__name__,
id='models.E017',
)
)
return errors
@classmethod
def _check_managers(cls, **kwargs):
"""Perform all manager checks."""
errors = []
for manager in cls._meta.managers:
errors.extend(manager.check(**kwargs))
return errors
@classmethod
def _check_fields(cls, **kwargs):
"""Perform all field checks."""
errors = []
for field in cls._meta.local_fields:
errors.extend(field.check(**kwargs))
for field in cls._meta.local_many_to_many:
errors.extend(field.check(from_model=cls, **kwargs))
return errors
@classmethod
def _check_m2m_through_same_relationship(cls):
""" Check if no relationship model is used by more than one m2m field.
"""
errors = []
seen_intermediary_signatures = []
fields = cls._meta.local_many_to_many
# Skip when the target model wasn't found.
fields = (f for f in fields if isinstance(f.remote_field.model, ModelBase))
# Skip when the relationship model wasn't found.
fields = (f for f in fields if isinstance(f.remote_field.through, ModelBase))
for f in fields:
signature = (f.remote_field.model, cls, f.remote_field.through, f.remote_field.through_fields)
if signature in seen_intermediary_signatures:
errors.append(
checks.Error(
"The model has two identical many-to-many relations "
"through the intermediate model '%s'." %
f.remote_field.through._meta.label,
obj=cls,
id='models.E003',
)
)
else:
seen_intermediary_signatures.append(signature)
return errors
@classmethod
def _check_id_field(cls):
"""Check if `id` field is a primary key."""
fields = [f for f in cls._meta.local_fields if f.name == 'id' and f != cls._meta.pk]
# fields is empty or consists of the invalid "id" field
if fields and not fields[0].primary_key and cls._meta.pk.name == 'id':
return [
checks.Error(
"'id' can only be used as a field name if the field also "
"sets 'primary_key=True'.",
obj=cls,
id='models.E004',
)
]
else:
return []
@classmethod
def _check_field_name_clashes(cls):
"""Forbid field shadowing in multi-table inheritance."""
errors = []
used_fields = {} # name or attname -> field
# Check that multi-inheritance doesn't cause field name shadowing.
for parent in cls._meta.get_parent_list():
for f in parent._meta.local_fields:
clash = used_fields.get(f.name) or used_fields.get(f.attname) or None
if clash:
errors.append(
checks.Error(
"The field '%s' from parent model "
"'%s' clashes with the field '%s' "
"from parent model '%s'." % (
clash.name, clash.model._meta,
f.name, f.model._meta
),
obj=cls,
id='models.E005',
)
)
used_fields[f.name] = f
used_fields[f.attname] = f
# Check that fields defined in the model don't clash with fields from
# parents, including auto-generated fields like multi-table inheritance
# child accessors.
for parent in cls._meta.get_parent_list():
for f in parent._meta.get_fields():
if f not in used_fields:
used_fields[f.name] = f
for f in cls._meta.local_fields:
clash = used_fields.get(f.name) or used_fields.get(f.attname) or None
# Note that we may detect clash between user-defined non-unique
# field "id" and automatically added unique field "id", both
# defined at the same model. This special case is considered in
# _check_id_field and here we ignore it.
id_conflict = f.name == "id" and clash and clash.name == "id" and clash.model == cls
if clash and not id_conflict:
errors.append(
checks.Error(
"The field '%s' clashes with the field '%s' "
"from model '%s'." % (
f.name, clash.name, clash.model._meta
),
obj=f,
id='models.E006',
)
)
used_fields[f.name] = f
used_fields[f.attname] = f
return errors
@classmethod
def _check_column_name_clashes(cls):
# Store a list of column names which have already been used by other fields.
used_column_names = []
errors = []
for f in cls._meta.local_fields:
_, column_name = f.get_attname_column()
# Ensure the column name is not already in use.
if column_name and column_name in used_column_names:
errors.append(
checks.Error(
"Field '%s' has column name '%s' that is used by "
"another field." % (f.name, column_name),
hint="Specify a 'db_column' for the field.",
obj=cls,
id='models.E007'
)
)
else:
used_column_names.append(column_name)
return errors
@classmethod
def _check_model_name_db_lookup_clashes(cls):
errors = []
model_name = cls.__name__
if model_name.startswith('_') or model_name.endswith('_'):
errors.append(
checks.Error(
"The model name '%s' cannot start or end with an underscore "
"as it collides with the query lookup syntax." % model_name,
obj=cls,
id='models.E023'
)
)
elif LOOKUP_SEP in model_name:
errors.append(
checks.Error(
"The model name '%s' cannot contain double underscores as "
"it collides with the query lookup syntax." % model_name,
obj=cls,
id='models.E024'
)
)
return errors
@classmethod
def _check_property_name_related_field_accessor_clashes(cls):
errors = []
property_names = cls._meta._property_names
related_field_accessors = (
f.get_attname() for f in cls._meta._get_fields(reverse=False)
if f.is_relation and f.related_model is not None
)
for accessor in related_field_accessors:
if accessor in property_names:
errors.append(
checks.Error(
"The property '%s' clashes with a related field "
"accessor." % accessor,
obj=cls,
id='models.E025',
)
)
return errors
@classmethod
def _check_single_primary_key(cls):
errors = []
if sum(1 for f in cls._meta.local_fields if f.primary_key) > 1:
errors.append(
checks.Error(
"The model cannot have more than one field with "
"'primary_key=True'.",
obj=cls,
id='models.E026',
)
)
return errors
@classmethod
def _check_index_together(cls):
"""Check the value of "index_together" option."""
if not isinstance(cls._meta.index_together, (tuple, list)):
return [
checks.Error(
"'index_together' must be a list or tuple.",
obj=cls,
id='models.E008',
)
]
elif any(not isinstance(fields, (tuple, list)) for fields in cls._meta.index_together):
return [
checks.Error(
"All 'index_together' elements must be lists or tuples.",
obj=cls,
id='models.E009',
)
]
else:
errors = []
for fields in cls._meta.index_together:
errors.extend(cls._check_local_fields(fields, "index_together"))
return errors
@classmethod
def _check_unique_together(cls):
"""Check the value of "unique_together" option."""
if not isinstance(cls._meta.unique_together, (tuple, list)):
return [
checks.Error(
"'unique_together' must be a list or tuple.",
obj=cls,
id='models.E010',
)
]
elif any(not isinstance(fields, (tuple, list)) for fields in cls._meta.unique_together):
return [
checks.Error(
"All 'unique_together' elements must be lists or tuples.",
obj=cls,
id='models.E011',
)
]
else:
errors = []
for fields in cls._meta.unique_together:
errors.extend(cls._check_local_fields(fields, "unique_together"))
return errors
@classmethod
def _check_indexes(cls):
"""Check the fields and names of indexes."""
errors = []
for index in cls._meta.indexes:
# Index name can't start with an underscore or a number, restricted
# for cross-database compatibility with Oracle.
if index.name[0] == '_' or index.name[0].isdigit():
errors.append(
checks.Error(
"The index name '%s' cannot start with an underscore "
"or a number." % index.name,
obj=cls,
id='models.E033',
),
)
if len(index.name) > index.max_name_length:
errors.append(
checks.Error(
"The index name '%s' cannot be longer than %d "
"characters." % (index.name, index.max_name_length),
obj=cls,
id='models.E034',
),
)
fields = [field for index in cls._meta.indexes for field, _ in index.fields_orders]
errors.extend(cls._check_local_fields(fields, 'indexes'))
return errors
@classmethod
def _check_local_fields(cls, fields, option):
from django.db import models
# In order to avoid hitting the relation tree prematurely, we use our
# own fields_map instead of using get_field()
forward_fields_map = {}
for field in cls._meta._get_fields(reverse=False):
forward_fields_map[field.name] = field
if hasattr(field, 'attname'):
forward_fields_map[field.attname] = field
errors = []
for field_name in fields:
try:
field = forward_fields_map[field_name]
except KeyError:
errors.append(
checks.Error(
"'%s' refers to the nonexistent field '%s'." % (
option, field_name,
),
obj=cls,
id='models.E012',
)
)
else:
if isinstance(field.remote_field, models.ManyToManyRel):
errors.append(
checks.Error(
"'%s' refers to a ManyToManyField '%s', but "
"ManyToManyFields are not permitted in '%s'." % (
option, field_name, option,
),
obj=cls,
id='models.E013',
)
)
elif field not in cls._meta.local_fields:
errors.append(
checks.Error(
"'%s' refers to field '%s' which is not local to model '%s'."
% (option, field_name, cls._meta.object_name),
hint="This issue may be caused by multi-table inheritance.",
obj=cls,
id='models.E016',
)
)
return errors
@classmethod
def _check_ordering(cls):
"""
Check "ordering" option -- is it a list of strings and do all fields
exist?
"""
if cls._meta._ordering_clash:
return [
checks.Error(
"'ordering' and 'order_with_respect_to' cannot be used together.",
obj=cls,
id='models.E021',
),
]
if cls._meta.order_with_respect_to or not cls._meta.ordering:
return []
if not isinstance(cls._meta.ordering, (list, tuple)):
return [
checks.Error(
"'ordering' must be a tuple or list (even if you want to order by only one field).",
obj=cls,
id='models.E014',
)
]
errors = []
fields = cls._meta.ordering
# Skip expressions and '?' fields.
fields = (f for f in fields if isinstance(f, str) and f != '?')
# Convert "-field" to "field".
fields = ((f[1:] if f.startswith('-') else f) for f in fields)
# Separate related fields and non-related fields.
_fields = []
related_fields = []
for f in fields:
if LOOKUP_SEP in f:
related_fields.append(f)
else:
_fields.append(f)
fields = _fields
# Check related fields.
for field in related_fields:
_cls = cls
fld = None
for part in field.split(LOOKUP_SEP):
try:
# pk is an alias that won't be found by opts.get_field.
if part == 'pk':
fld = _cls._meta.pk
else:
fld = _cls._meta.get_field(part)
if fld.is_relation:
_cls = fld.get_path_info()[-1].to_opts.model
else:
_cls = None
except (FieldDoesNotExist, AttributeError):
if fld is None or fld.get_transform(part) is None:
errors.append(
checks.Error(
"'ordering' refers to the nonexistent field, "
"related field, or lookup '%s'." % field,
obj=cls,
id='models.E015',
)
)
# Skip ordering on pk. This is always a valid order_by field
# but is an alias and therefore won't be found by opts.get_field.
fields = {f for f in fields if f != 'pk'}
# Check for invalid or nonexistent fields in ordering.
invalid_fields = []
# Any field name that is not present in field_names does not exist.
# Also, ordering by m2m fields is not allowed.
opts = cls._meta
valid_fields = set(chain.from_iterable(
(f.name, f.attname) if not (f.auto_created and not f.concrete) else (f.field.related_query_name(),)
for f in chain(opts.fields, opts.related_objects)
))
invalid_fields.extend(fields - valid_fields)
for invalid_field in invalid_fields:
errors.append(
checks.Error(
"'ordering' refers to the nonexistent field, related "
"field, or lookup '%s'." % invalid_field,
obj=cls,
id='models.E015',
)
)
return errors
@classmethod
def _check_long_column_names(cls):
"""
Check that any auto-generated column names are shorter than the limits
for each database in which the model will be created.
"""
errors = []
allowed_len = None
db_alias = None
# Find the minimum max allowed length among all specified db_aliases.
for db in settings.DATABASES:
# skip databases where the model won't be created
if not router.allow_migrate_model(db, cls):
continue
connection = connections[db]
max_name_length = connection.ops.max_name_length()
if max_name_length is None or connection.features.truncates_names:
continue
else:
if allowed_len is None:
allowed_len = max_name_length
db_alias = db
elif max_name_length < allowed_len:
allowed_len = max_name_length
db_alias = db
if allowed_len is None:
return errors
for f in cls._meta.local_fields:
_, column_name = f.get_attname_column()
# Check if auto-generated name for the field is too long
# for the database.
if f.db_column is None and column_name is not None and len(column_name) > allowed_len:
errors.append(
checks.Error(
'Autogenerated column name too long for field "%s". '
'Maximum length is "%s" for database "%s".'
% (column_name, allowed_len, db_alias),
hint="Set the column name manually using 'db_column'.",
obj=cls,
id='models.E018',
)
)
for f in cls._meta.local_many_to_many:
# Skip nonexistent models.
if isinstance(f.remote_field.through, str):
continue
# Check if auto-generated name for the M2M field is too long
# for the database.
for m2m in f.remote_field.through._meta.local_fields:
_, rel_name = m2m.get_attname_column()
if m2m.db_column is None and rel_name is not None and len(rel_name) > allowed_len:
errors.append(
checks.Error(
'Autogenerated column name too long for M2M field '
'"%s". Maximum length is "%s" for database "%s".'
% (rel_name, allowed_len, db_alias),
hint=(
"Use 'through' to create a separate model for "
"M2M and then set column_name using 'db_column'."
),
obj=cls,
id='models.E019',
)
)
return errors
@classmethod
def _check_constraints(cls):
errors = []
for db in settings.DATABASES:
if not router.allow_migrate_model(db, cls):
continue
connection = connections[db]
if (
connection.features.supports_table_check_constraints or
'supports_table_check_constraints' in cls._meta.required_db_features
):
continue
if any(isinstance(constraint, CheckConstraint) for constraint in cls._meta.constraints):
errors.append(
checks.Warning(
'%s does not support check constraints.' % connection.display_name,
hint=(
"A constraint won't be created. Silence this "
"warning if you don't care about it."
),
obj=cls,
id='models.W027',
)
)
return errors
############################################
# HELPER FUNCTIONS (CURRIED MODEL METHODS) #
############################################
# ORDERING METHODS #########################
def method_set_order(self, ordered_obj, id_list, using=None):
if using is None:
using = DEFAULT_DB_ALIAS
order_wrt = ordered_obj._meta.order_with_respect_to
filter_args = order_wrt.get_forward_related_filter(self)
ordered_obj.objects.db_manager(using).filter(**filter_args).bulk_update([
ordered_obj(pk=pk, _order=order) for order, pk in enumerate(id_list)
], ['_order'])
def method_get_order(self, ordered_obj):
order_wrt = ordered_obj._meta.order_with_respect_to
filter_args = order_wrt.get_forward_related_filter(self)
pk_name = ordered_obj._meta.pk.name
return ordered_obj.objects.filter(**filter_args).values_list(pk_name, flat=True)
def make_foreign_order_accessors(model, related_model):
setattr(
related_model,
'get_%s_order' % model.__name__.lower(),
partialmethod(method_get_order, model)
)
setattr(
related_model,
'set_%s_order' % model.__name__.lower(),
partialmethod(method_set_order, model)
)
########
# MISC #
########
def model_unpickle(model_id):
"""Used to unpickle Model subclasses with deferred fields."""
if isinstance(model_id, tuple):
model = apps.get_model(*model_id)
else:
# Backwards compat - the model was cached directly in earlier versions.
model = model_id
return model.__new__(model)
model_unpickle.__safe_for_unpickle__ = True
|
3d51819de4b9de38b57e01fb1e14d74a7ff1389305527be3a4b56ab063443b99 | import copy
import datetime
import inspect
from decimal import Decimal
from django.core.exceptions import EmptyResultSet, FieldError
from django.db import NotSupportedError, connection
from django.db.models import fields
from django.db.models.query_utils import Q
from django.utils.deconstruct import deconstructible
from django.utils.functional import cached_property
from django.utils.hashable import make_hashable
class SQLiteNumericMixin:
"""
Some expressions with output_field=DecimalField() must be cast to
numeric to be properly filtered.
"""
def as_sqlite(self, compiler, connection, **extra_context):
sql, params = self.as_sql(compiler, connection, **extra_context)
try:
if self.output_field.get_internal_type() == 'DecimalField':
sql = 'CAST(%s AS NUMERIC)' % sql
except FieldError:
pass
return sql, params
class Combinable:
"""
Provide the ability to combine one or two objects with
some connector. For example F('foo') + F('bar').
"""
# Arithmetic connectors
ADD = '+'
SUB = '-'
MUL = '*'
DIV = '/'
POW = '^'
# The following is a quoted % operator - it is quoted because it can be
# used in strings that also have parameter substitution.
MOD = '%%'
# Bitwise operators - note that these are generated by .bitand()
# and .bitor(), the '&' and '|' are reserved for boolean operator
# usage.
BITAND = '&'
BITOR = '|'
BITLEFTSHIFT = '<<'
BITRIGHTSHIFT = '>>'
def _combine(self, other, connector, reversed):
if not hasattr(other, 'resolve_expression'):
# everything must be resolvable to an expression
if isinstance(other, datetime.timedelta):
other = DurationValue(other, output_field=fields.DurationField())
else:
other = Value(other)
if reversed:
return CombinedExpression(other, connector, self)
return CombinedExpression(self, connector, other)
#############
# OPERATORS #
#############
def __neg__(self):
return self._combine(-1, self.MUL, False)
def __add__(self, other):
return self._combine(other, self.ADD, False)
def __sub__(self, other):
return self._combine(other, self.SUB, False)
def __mul__(self, other):
return self._combine(other, self.MUL, False)
def __truediv__(self, other):
return self._combine(other, self.DIV, False)
def __mod__(self, other):
return self._combine(other, self.MOD, False)
def __pow__(self, other):
return self._combine(other, self.POW, False)
def __and__(self, other):
if getattr(self, 'conditional', False) and getattr(other, 'conditional', False):
return Q(self) & Q(other)
raise NotImplementedError(
"Use .bitand() and .bitor() for bitwise logical operations."
)
def bitand(self, other):
return self._combine(other, self.BITAND, False)
def bitleftshift(self, other):
return self._combine(other, self.BITLEFTSHIFT, False)
def bitrightshift(self, other):
return self._combine(other, self.BITRIGHTSHIFT, False)
def __or__(self, other):
if getattr(self, 'conditional', False) and getattr(other, 'conditional', False):
return Q(self) | Q(other)
raise NotImplementedError(
"Use .bitand() and .bitor() for bitwise logical operations."
)
def bitor(self, other):
return self._combine(other, self.BITOR, False)
def __radd__(self, other):
return self._combine(other, self.ADD, True)
def __rsub__(self, other):
return self._combine(other, self.SUB, True)
def __rmul__(self, other):
return self._combine(other, self.MUL, True)
def __rtruediv__(self, other):
return self._combine(other, self.DIV, True)
def __rmod__(self, other):
return self._combine(other, self.MOD, True)
def __rpow__(self, other):
return self._combine(other, self.POW, True)
def __rand__(self, other):
raise NotImplementedError(
"Use .bitand() and .bitor() for bitwise logical operations."
)
def __ror__(self, other):
raise NotImplementedError(
"Use .bitand() and .bitor() for bitwise logical operations."
)
@deconstructible
class BaseExpression:
"""Base class for all query expressions."""
# aggregate specific fields
is_summary = False
_output_field_resolved_to_none = False
# Can the expression be used in a WHERE clause?
filterable = True
# Can the expression can be used as a source expression in Window?
window_compatible = False
def __init__(self, output_field=None):
if output_field is not None:
self.output_field = output_field
def __getstate__(self):
state = self.__dict__.copy()
state.pop('convert_value', None)
return state
def get_db_converters(self, connection):
return (
[]
if self.convert_value is self._convert_value_noop else
[self.convert_value]
) + self.output_field.get_db_converters(connection)
def get_source_expressions(self):
return []
def set_source_expressions(self, exprs):
assert not exprs
def _parse_expressions(self, *expressions):
return [
arg if hasattr(arg, 'resolve_expression') else (
F(arg) if isinstance(arg, str) else Value(arg)
) for arg in expressions
]
def as_sql(self, compiler, connection):
"""
Responsible for returning a (sql, [params]) tuple to be included
in the current query.
Different backends can provide their own implementation, by
providing an `as_{vendor}` method and patching the Expression:
```
def override_as_sql(self, compiler, connection):
# custom logic
return super().as_sql(compiler, connection)
setattr(Expression, 'as_' + connection.vendor, override_as_sql)
```
Arguments:
* compiler: the query compiler responsible for generating the query.
Must have a compile method, returning a (sql, [params]) tuple.
Calling compiler(value) will return a quoted `value`.
* connection: the database connection used for the current query.
Return: (sql, params)
Where `sql` is a string containing ordered sql parameters to be
replaced with the elements of the list `params`.
"""
raise NotImplementedError("Subclasses must implement as_sql()")
@cached_property
def contains_aggregate(self):
return any(expr and expr.contains_aggregate for expr in self.get_source_expressions())
@cached_property
def contains_over_clause(self):
return any(expr and expr.contains_over_clause for expr in self.get_source_expressions())
@cached_property
def contains_column_references(self):
return any(expr and expr.contains_column_references for expr in self.get_source_expressions())
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
"""
Provide the chance to do any preprocessing or validation before being
added to the query.
Arguments:
* query: the backend query implementation
* allow_joins: boolean allowing or denying use of joins
in this query
* reuse: a set of reusable joins for multijoins
* summarize: a terminal aggregate clause
* for_save: whether this expression about to be used in a save or update
Return: an Expression to be added to the query.
"""
c = self.copy()
c.is_summary = summarize
c.set_source_expressions([
expr.resolve_expression(query, allow_joins, reuse, summarize)
if expr else None
for expr in c.get_source_expressions()
])
return c
@property
def conditional(self):
return isinstance(self.output_field, fields.BooleanField)
@property
def field(self):
return self.output_field
@cached_property
def output_field(self):
"""Return the output type of this expressions."""
output_field = self._resolve_output_field()
if output_field is None:
self._output_field_resolved_to_none = True
raise FieldError('Cannot resolve expression type, unknown output_field')
return output_field
@cached_property
def _output_field_or_none(self):
"""
Return the output field of this expression, or None if
_resolve_output_field() didn't return an output type.
"""
try:
return self.output_field
except FieldError:
if not self._output_field_resolved_to_none:
raise
def _resolve_output_field(self):
"""
Attempt to infer the output type of the expression. If the output
fields of all source fields match then, simply infer the same type
here. This isn't always correct, but it makes sense most of the time.
Consider the difference between `2 + 2` and `2 / 3`. Inferring
the type here is a convenience for the common case. The user should
supply their own output_field with more complex computations.
If a source's output field resolves to None, exclude it from this check.
If all sources are None, then an error is raised higher up the stack in
the output_field property.
"""
sources_iter = (source for source in self.get_source_fields() if source is not None)
for output_field in sources_iter:
for source in sources_iter:
if not isinstance(output_field, source.__class__):
raise FieldError(
'Expression contains mixed types: %s, %s. You must '
'set output_field.' % (
output_field.__class__.__name__,
source.__class__.__name__,
)
)
return output_field
@staticmethod
def _convert_value_noop(value, expression, connection):
return value
@cached_property
def convert_value(self):
"""
Expressions provide their own converters because users have the option
of manually specifying the output_field which may be a different type
from the one the database returns.
"""
field = self.output_field
internal_type = field.get_internal_type()
if internal_type == 'FloatField':
return lambda value, expression, connection: None if value is None else float(value)
elif internal_type.endswith('IntegerField'):
return lambda value, expression, connection: None if value is None else int(value)
elif internal_type == 'DecimalField':
return lambda value, expression, connection: None if value is None else Decimal(value)
return self._convert_value_noop
def get_lookup(self, lookup):
return self.output_field.get_lookup(lookup)
def get_transform(self, name):
return self.output_field.get_transform(name)
def relabeled_clone(self, change_map):
clone = self.copy()
clone.set_source_expressions([
e.relabeled_clone(change_map) if e is not None else None
for e in self.get_source_expressions()
])
return clone
def copy(self):
return copy.copy(self)
def get_group_by_cols(self, alias=None):
if not self.contains_aggregate:
return [self]
cols = []
for source in self.get_source_expressions():
cols.extend(source.get_group_by_cols())
return cols
def get_source_fields(self):
"""Return the underlying field types used by this aggregate."""
return [e._output_field_or_none for e in self.get_source_expressions()]
def asc(self, **kwargs):
return OrderBy(self, **kwargs)
def desc(self, **kwargs):
return OrderBy(self, descending=True, **kwargs)
def reverse_ordering(self):
return self
def flatten(self):
"""
Recursively yield this expression and all subexpressions, in
depth-first order.
"""
yield self
for expr in self.get_source_expressions():
if expr:
yield from expr.flatten()
def select_format(self, compiler, sql, params):
"""
Custom format for select clauses. For example, EXISTS expressions need
to be wrapped in CASE WHEN on Oracle.
"""
return self.output_field.select_format(compiler, sql, params)
@cached_property
def identity(self):
constructor_signature = inspect.signature(self.__init__)
args, kwargs = self._constructor_args
signature = constructor_signature.bind_partial(*args, **kwargs)
signature.apply_defaults()
arguments = signature.arguments.items()
identity = [self.__class__]
for arg, value in arguments:
if isinstance(value, fields.Field):
if value.name and value.model:
value = (value.model._meta.label, value.name)
else:
value = type(value)
else:
value = make_hashable(value)
identity.append((arg, value))
return tuple(identity)
def __eq__(self, other):
if not isinstance(other, BaseExpression):
return NotImplemented
return other.identity == self.identity
def __hash__(self):
return hash(self.identity)
class Expression(BaseExpression, Combinable):
"""An expression that can be combined with other expressions."""
pass
class CombinedExpression(SQLiteNumericMixin, Expression):
def __init__(self, lhs, connector, rhs, output_field=None):
super().__init__(output_field=output_field)
self.connector = connector
self.lhs = lhs
self.rhs = rhs
def __repr__(self):
return "<{}: {}>".format(self.__class__.__name__, self)
def __str__(self):
return "{} {} {}".format(self.lhs, self.connector, self.rhs)
def get_source_expressions(self):
return [self.lhs, self.rhs]
def set_source_expressions(self, exprs):
self.lhs, self.rhs = exprs
def as_sql(self, compiler, connection):
try:
lhs_output = self.lhs.output_field
except FieldError:
lhs_output = None
try:
rhs_output = self.rhs.output_field
except FieldError:
rhs_output = None
if (not connection.features.has_native_duration_field and
((lhs_output and lhs_output.get_internal_type() == 'DurationField') or
(rhs_output and rhs_output.get_internal_type() == 'DurationField'))):
return DurationExpression(self.lhs, self.connector, self.rhs).as_sql(compiler, connection)
if (lhs_output and rhs_output and self.connector == self.SUB and
lhs_output.get_internal_type() in {'DateField', 'DateTimeField', 'TimeField'} and
lhs_output.get_internal_type() == rhs_output.get_internal_type()):
return TemporalSubtraction(self.lhs, self.rhs).as_sql(compiler, connection)
expressions = []
expression_params = []
sql, params = compiler.compile(self.lhs)
expressions.append(sql)
expression_params.extend(params)
sql, params = compiler.compile(self.rhs)
expressions.append(sql)
expression_params.extend(params)
# order of precedence
expression_wrapper = '(%s)'
sql = connection.ops.combine_expression(self.connector, expressions)
return expression_wrapper % sql, expression_params
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
c = self.copy()
c.is_summary = summarize
c.lhs = c.lhs.resolve_expression(query, allow_joins, reuse, summarize, for_save)
c.rhs = c.rhs.resolve_expression(query, allow_joins, reuse, summarize, for_save)
return c
class DurationExpression(CombinedExpression):
def compile(self, side, compiler, connection):
if not isinstance(side, DurationValue):
try:
output = side.output_field
except FieldError:
pass
else:
if output.get_internal_type() == 'DurationField':
sql, params = compiler.compile(side)
return connection.ops.format_for_duration_arithmetic(sql), params
return compiler.compile(side)
def as_sql(self, compiler, connection):
connection.ops.check_expression_support(self)
expressions = []
expression_params = []
sql, params = self.compile(self.lhs, compiler, connection)
expressions.append(sql)
expression_params.extend(params)
sql, params = self.compile(self.rhs, compiler, connection)
expressions.append(sql)
expression_params.extend(params)
# order of precedence
expression_wrapper = '(%s)'
sql = connection.ops.combine_duration_expression(self.connector, expressions)
return expression_wrapper % sql, expression_params
class TemporalSubtraction(CombinedExpression):
output_field = fields.DurationField()
def __init__(self, lhs, rhs):
super().__init__(lhs, self.SUB, rhs)
def as_sql(self, compiler, connection):
connection.ops.check_expression_support(self)
lhs = compiler.compile(self.lhs)
rhs = compiler.compile(self.rhs)
return connection.ops.subtract_temporals(self.lhs.output_field.get_internal_type(), lhs, rhs)
@deconstructible
class F(Combinable):
"""An object capable of resolving references to existing query objects."""
def __init__(self, name):
"""
Arguments:
* name: the name of the field this expression references
"""
self.name = name
def __repr__(self):
return "{}({})".format(self.__class__.__name__, self.name)
def resolve_expression(self, query=None, allow_joins=True, reuse=None,
summarize=False, for_save=False):
return query.resolve_ref(self.name, allow_joins, reuse, summarize)
def asc(self, **kwargs):
return OrderBy(self, **kwargs)
def desc(self, **kwargs):
return OrderBy(self, descending=True, **kwargs)
def __eq__(self, other):
return self.__class__ == other.__class__ and self.name == other.name
def __hash__(self):
return hash(self.name)
class ResolvedOuterRef(F):
"""
An object that contains a reference to an outer query.
In this case, the reference to the outer query has been resolved because
the inner query has been used as a subquery.
"""
contains_aggregate = False
def as_sql(self, *args, **kwargs):
raise ValueError(
'This queryset contains a reference to an outer query and may '
'only be used in a subquery.'
)
def relabeled_clone(self, relabels):
return self
class OuterRef(F):
def resolve_expression(self, *args, **kwargs):
if isinstance(self.name, self.__class__):
return self.name
return ResolvedOuterRef(self.name)
class Func(SQLiteNumericMixin, Expression):
"""An SQL function call."""
function = None
template = '%(function)s(%(expressions)s)'
arg_joiner = ', '
arity = None # The number of arguments the function accepts.
def __init__(self, *expressions, output_field=None, **extra):
if self.arity is not None and len(expressions) != self.arity:
raise TypeError(
"'%s' takes exactly %s %s (%s given)" % (
self.__class__.__name__,
self.arity,
"argument" if self.arity == 1 else "arguments",
len(expressions),
)
)
super().__init__(output_field=output_field)
self.source_expressions = self._parse_expressions(*expressions)
self.extra = extra
def __repr__(self):
args = self.arg_joiner.join(str(arg) for arg in self.source_expressions)
extra = {**self.extra, **self._get_repr_options()}
if extra:
extra = ', '.join(str(key) + '=' + str(val) for key, val in sorted(extra.items()))
return "{}({}, {})".format(self.__class__.__name__, args, extra)
return "{}({})".format(self.__class__.__name__, args)
def _get_repr_options(self):
"""Return a dict of extra __init__() options to include in the repr."""
return {}
def get_source_expressions(self):
return self.source_expressions
def set_source_expressions(self, exprs):
self.source_expressions = exprs
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
c = self.copy()
c.is_summary = summarize
for pos, arg in enumerate(c.source_expressions):
c.source_expressions[pos] = arg.resolve_expression(query, allow_joins, reuse, summarize, for_save)
return c
def as_sql(self, compiler, connection, function=None, template=None, arg_joiner=None, **extra_context):
connection.ops.check_expression_support(self)
sql_parts = []
params = []
for arg in self.source_expressions:
arg_sql, arg_params = compiler.compile(arg)
sql_parts.append(arg_sql)
params.extend(arg_params)
data = {**self.extra, **extra_context}
# Use the first supplied value in this order: the parameter to this
# method, a value supplied in __init__()'s **extra (the value in
# `data`), or the value defined on the class.
if function is not None:
data['function'] = function
else:
data.setdefault('function', self.function)
template = template or data.get('template', self.template)
arg_joiner = arg_joiner or data.get('arg_joiner', self.arg_joiner)
data['expressions'] = data['field'] = arg_joiner.join(sql_parts)
return template % data, params
def copy(self):
copy = super().copy()
copy.source_expressions = self.source_expressions[:]
copy.extra = self.extra.copy()
return copy
class Value(Expression):
"""Represent a wrapped value as a node within an expression."""
def __init__(self, value, output_field=None):
"""
Arguments:
* value: the value this expression represents. The value will be
added into the sql parameter list and properly quoted.
* output_field: an instance of the model field type that this
expression will return, such as IntegerField() or CharField().
"""
super().__init__(output_field=output_field)
self.value = value
def __repr__(self):
return "{}({})".format(self.__class__.__name__, self.value)
def as_sql(self, compiler, connection):
connection.ops.check_expression_support(self)
val = self.value
output_field = self._output_field_or_none
if output_field is not None:
if self.for_save:
val = output_field.get_db_prep_save(val, connection=connection)
else:
val = output_field.get_db_prep_value(val, connection=connection)
if hasattr(output_field, 'get_placeholder'):
return output_field.get_placeholder(val, compiler, connection), [val]
if val is None:
# cx_Oracle does not always convert None to the appropriate
# NULL type (like in case expressions using numbers), so we
# use a literal SQL NULL
return 'NULL', []
return '%s', [val]
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
c = super().resolve_expression(query, allow_joins, reuse, summarize, for_save)
c.for_save = for_save
return c
def get_group_by_cols(self, alias=None):
return []
class DurationValue(Value):
def as_sql(self, compiler, connection):
connection.ops.check_expression_support(self)
if connection.features.has_native_duration_field:
return super().as_sql(compiler, connection)
return connection.ops.date_interval_sql(self.value), []
class RawSQL(Expression):
def __init__(self, sql, params, output_field=None):
if output_field is None:
output_field = fields.Field()
self.sql, self.params = sql, params
super().__init__(output_field=output_field)
def __repr__(self):
return "{}({}, {})".format(self.__class__.__name__, self.sql, self.params)
def as_sql(self, compiler, connection):
return '(%s)' % self.sql, self.params
def get_group_by_cols(self, alias=None):
return [self]
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
# Resolve parents fields used in raw SQL.
for parent in query.model._meta.get_parent_list():
for parent_field in parent._meta.local_fields:
_, column_name = parent_field.get_attname_column()
if column_name.lower() in self.sql.lower():
query.resolve_ref(parent_field.name, allow_joins, reuse, summarize)
break
return super().resolve_expression(query, allow_joins, reuse, summarize, for_save)
class Star(Expression):
def __repr__(self):
return "'*'"
def as_sql(self, compiler, connection):
return '*', []
class Random(Expression):
output_field = fields.FloatField()
def __repr__(self):
return "Random()"
def as_sql(self, compiler, connection):
return connection.ops.random_function_sql(), []
class Col(Expression):
contains_column_references = True
def __init__(self, alias, target, output_field=None):
if output_field is None:
output_field = target
super().__init__(output_field=output_field)
self.alias, self.target = alias, target
def __repr__(self):
alias, target = self.alias, self.target
identifiers = (alias, str(target)) if alias else (str(target),)
return '{}({})'.format(self.__class__.__name__, ', '.join(identifiers))
def as_sql(self, compiler, connection):
alias, column = self.alias, self.target.column
identifiers = (alias, column) if alias else (column,)
sql = '.'.join(map(compiler.quote_name_unless_alias, identifiers))
return sql, []
def relabeled_clone(self, relabels):
if self.alias is None:
return self
return self.__class__(relabels.get(self.alias, self.alias), self.target, self.output_field)
def get_group_by_cols(self, alias=None):
return [self]
def get_db_converters(self, connection):
if self.target == self.output_field:
return self.output_field.get_db_converters(connection)
return (self.output_field.get_db_converters(connection) +
self.target.get_db_converters(connection))
class Ref(Expression):
"""
Reference to column alias of the query. For example, Ref('sum_cost') in
qs.annotate(sum_cost=Sum('cost')) query.
"""
def __init__(self, refs, source):
super().__init__()
self.refs, self.source = refs, source
def __repr__(self):
return "{}({}, {})".format(self.__class__.__name__, self.refs, self.source)
def get_source_expressions(self):
return [self.source]
def set_source_expressions(self, exprs):
self.source, = exprs
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
# The sub-expression `source` has already been resolved, as this is
# just a reference to the name of `source`.
return self
def relabeled_clone(self, relabels):
return self
def as_sql(self, compiler, connection):
return connection.ops.quote_name(self.refs), []
def get_group_by_cols(self, alias=None):
return [self]
class ExpressionList(Func):
"""
An expression containing multiple expressions. Can be used to provide a
list of expressions as an argument to another expression, like an
ordering clause.
"""
template = '%(expressions)s'
def __init__(self, *expressions, **extra):
if not expressions:
raise ValueError('%s requires at least one expression.' % self.__class__.__name__)
super().__init__(*expressions, **extra)
def __str__(self):
return self.arg_joiner.join(str(arg) for arg in self.source_expressions)
class ExpressionWrapper(Expression):
"""
An expression that can wrap another expression so that it can provide
extra context to the inner expression, such as the output_field.
"""
def __init__(self, expression, output_field):
super().__init__(output_field=output_field)
self.expression = expression
def set_source_expressions(self, exprs):
self.expression = exprs[0]
def get_source_expressions(self):
return [self.expression]
def as_sql(self, compiler, connection):
return self.expression.as_sql(compiler, connection)
def __repr__(self):
return "{}({})".format(self.__class__.__name__, self.expression)
class When(Expression):
template = 'WHEN %(condition)s THEN %(result)s'
# This isn't a complete conditional expression, must be used in Case().
conditional = False
def __init__(self, condition=None, then=None, **lookups):
if lookups and condition is None:
condition, lookups = Q(**lookups), None
if condition is None or not getattr(condition, 'conditional', False) or lookups:
raise TypeError(
'When() supports a Q object, a boolean expression, or lookups '
'as a condition.'
)
if isinstance(condition, Q) and not condition:
raise ValueError("An empty Q() can't be used as a When() condition.")
super().__init__(output_field=None)
self.condition = condition
self.result = self._parse_expressions(then)[0]
def __str__(self):
return "WHEN %r THEN %r" % (self.condition, self.result)
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self)
def get_source_expressions(self):
return [self.condition, self.result]
def set_source_expressions(self, exprs):
self.condition, self.result = exprs
def get_source_fields(self):
# We're only interested in the fields of the result expressions.
return [self.result._output_field_or_none]
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
c = self.copy()
c.is_summary = summarize
if hasattr(c.condition, 'resolve_expression'):
c.condition = c.condition.resolve_expression(query, allow_joins, reuse, summarize, False)
c.result = c.result.resolve_expression(query, allow_joins, reuse, summarize, for_save)
return c
def as_sql(self, compiler, connection, template=None, **extra_context):
connection.ops.check_expression_support(self)
template_params = extra_context
sql_params = []
condition_sql, condition_params = compiler.compile(self.condition)
template_params['condition'] = condition_sql
sql_params.extend(condition_params)
result_sql, result_params = compiler.compile(self.result)
template_params['result'] = result_sql
sql_params.extend(result_params)
template = template or self.template
return template % template_params, sql_params
def get_group_by_cols(self, alias=None):
# This is not a complete expression and cannot be used in GROUP BY.
cols = []
for source in self.get_source_expressions():
cols.extend(source.get_group_by_cols())
return cols
class Case(Expression):
"""
An SQL searched CASE expression:
CASE
WHEN n > 0
THEN 'positive'
WHEN n < 0
THEN 'negative'
ELSE 'zero'
END
"""
template = 'CASE %(cases)s ELSE %(default)s END'
case_joiner = ' '
def __init__(self, *cases, default=None, output_field=None, **extra):
if not all(isinstance(case, When) for case in cases):
raise TypeError("Positional arguments must all be When objects.")
super().__init__(output_field)
self.cases = list(cases)
self.default = self._parse_expressions(default)[0]
self.extra = extra
def __str__(self):
return "CASE %s, ELSE %r" % (', '.join(str(c) for c in self.cases), self.default)
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self)
def get_source_expressions(self):
return self.cases + [self.default]
def set_source_expressions(self, exprs):
*self.cases, self.default = exprs
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
c = self.copy()
c.is_summary = summarize
for pos, case in enumerate(c.cases):
c.cases[pos] = case.resolve_expression(query, allow_joins, reuse, summarize, for_save)
c.default = c.default.resolve_expression(query, allow_joins, reuse, summarize, for_save)
return c
def copy(self):
c = super().copy()
c.cases = c.cases[:]
return c
def as_sql(self, compiler, connection, template=None, case_joiner=None, **extra_context):
connection.ops.check_expression_support(self)
if not self.cases:
return compiler.compile(self.default)
template_params = {**self.extra, **extra_context}
case_parts = []
sql_params = []
for case in self.cases:
try:
case_sql, case_params = compiler.compile(case)
except EmptyResultSet:
continue
case_parts.append(case_sql)
sql_params.extend(case_params)
default_sql, default_params = compiler.compile(self.default)
if not case_parts:
return default_sql, default_params
case_joiner = case_joiner or self.case_joiner
template_params['cases'] = case_joiner.join(case_parts)
template_params['default'] = default_sql
sql_params.extend(default_params)
template = template or template_params.get('template', self.template)
sql = template % template_params
if self._output_field_or_none is not None:
sql = connection.ops.unification_cast_sql(self.output_field) % sql
return sql, sql_params
class Subquery(Expression):
"""
An explicit subquery. It may contain OuterRef() references to the outer
query which will be resolved when it is applied to that query.
"""
template = '(%(subquery)s)'
contains_aggregate = False
def __init__(self, queryset, output_field=None, **extra):
self.query = queryset.query
self.extra = extra
super().__init__(output_field)
def __getstate__(self):
state = super().__getstate__()
state.pop('_constructor_args', None)
return state
def get_source_expressions(self):
return [self.query]
def set_source_expressions(self, exprs):
self.query = exprs[0]
def _resolve_output_field(self):
return self.query.output_field
def copy(self):
clone = super().copy()
clone.query = clone.query.clone()
return clone
@property
def external_aliases(self):
return self.query.external_aliases
def as_sql(self, compiler, connection, template=None, **extra_context):
connection.ops.check_expression_support(self)
template_params = {**self.extra, **extra_context}
subquery_sql, sql_params = self.query.as_sql(compiler, connection)
template_params['subquery'] = subquery_sql[1:-1]
template = template or template_params.get('template', self.template)
sql = template % template_params
return sql, sql_params
def get_group_by_cols(self, alias=None):
if alias:
return [Ref(alias, self)]
return self.query.get_external_cols()
class Exists(Subquery):
template = 'EXISTS(%(subquery)s)'
output_field = fields.BooleanField()
def __init__(self, queryset, negated=False, **kwargs):
# As a performance optimization, remove ordering since EXISTS doesn't
# care about it, just whether or not a row matches.
queryset = queryset.order_by()
self.negated = negated
super().__init__(queryset, **kwargs)
def __invert__(self):
clone = self.copy()
clone.negated = not self.negated
return clone
def as_sql(self, compiler, connection, template=None, **extra_context):
sql, params = super().as_sql(compiler, connection, template, **extra_context)
if self.negated:
sql = 'NOT {}'.format(sql)
return sql, params
def select_format(self, compiler, sql, params):
# Wrap EXISTS() with a CASE WHEN expression if a database backend
# (e.g. Oracle) doesn't support boolean expression in the SELECT list.
if not compiler.connection.features.supports_boolean_expr_in_select_clause:
sql = 'CASE WHEN {} THEN 1 ELSE 0 END'.format(sql)
return sql, params
class OrderBy(BaseExpression):
template = '%(expression)s %(ordering)s'
conditional = False
def __init__(self, expression, descending=False, nulls_first=False, nulls_last=False):
if nulls_first and nulls_last:
raise ValueError('nulls_first and nulls_last are mutually exclusive')
self.nulls_first = nulls_first
self.nulls_last = nulls_last
self.descending = descending
if not hasattr(expression, 'resolve_expression'):
raise ValueError('expression must be an expression type')
self.expression = expression
def __repr__(self):
return "{}({}, descending={})".format(
self.__class__.__name__, self.expression, self.descending)
def set_source_expressions(self, exprs):
self.expression = exprs[0]
def get_source_expressions(self):
return [self.expression]
def as_sql(self, compiler, connection, template=None, **extra_context):
template = template or self.template
if connection.features.supports_order_by_nulls_modifier:
if self.nulls_last:
template = '%s NULLS LAST' % template
elif self.nulls_first:
template = '%s NULLS FIRST' % template
else:
if self.nulls_last:
template = '%%(expression)s IS NULL, %s' % template
elif self.nulls_first:
template = '%%(expression)s IS NOT NULL, %s' % template
connection.ops.check_expression_support(self)
expression_sql, params = compiler.compile(self.expression)
placeholders = {
'expression': expression_sql,
'ordering': 'DESC' if self.descending else 'ASC',
**extra_context,
}
template = template or self.template
params *= template.count('%(expression)s')
return (template % placeholders).rstrip(), params
def as_oracle(self, compiler, connection):
# Oracle doesn't allow ORDER BY EXISTS() unless it's wrapped in
# a CASE WHEN.
if isinstance(self.expression, Exists):
copy = self.copy()
copy.expression = Case(
When(self.expression, then=True),
default=False,
output_field=fields.BooleanField(),
)
return copy.as_sql(compiler, connection)
return self.as_sql(compiler, connection)
def get_group_by_cols(self, alias=None):
cols = []
for source in self.get_source_expressions():
cols.extend(source.get_group_by_cols())
return cols
def reverse_ordering(self):
self.descending = not self.descending
if self.nulls_first or self.nulls_last:
self.nulls_first = not self.nulls_first
self.nulls_last = not self.nulls_last
return self
def asc(self):
self.descending = False
def desc(self):
self.descending = True
class Window(Expression):
template = '%(expression)s OVER (%(window)s)'
# Although the main expression may either be an aggregate or an
# expression with an aggregate function, the GROUP BY that will
# be introduced in the query as a result is not desired.
contains_aggregate = False
contains_over_clause = True
filterable = False
def __init__(self, expression, partition_by=None, order_by=None, frame=None, output_field=None):
self.partition_by = partition_by
self.order_by = order_by
self.frame = frame
if not getattr(expression, 'window_compatible', False):
raise ValueError(
"Expression '%s' isn't compatible with OVER clauses." %
expression.__class__.__name__
)
if self.partition_by is not None:
if not isinstance(self.partition_by, (tuple, list)):
self.partition_by = (self.partition_by,)
self.partition_by = ExpressionList(*self.partition_by)
if self.order_by is not None:
if isinstance(self.order_by, (list, tuple)):
self.order_by = ExpressionList(*self.order_by)
elif not isinstance(self.order_by, BaseExpression):
raise ValueError(
'order_by must be either an Expression or a sequence of '
'expressions.'
)
super().__init__(output_field=output_field)
self.source_expression = self._parse_expressions(expression)[0]
def _resolve_output_field(self):
return self.source_expression.output_field
def get_source_expressions(self):
return [self.source_expression, self.partition_by, self.order_by, self.frame]
def set_source_expressions(self, exprs):
self.source_expression, self.partition_by, self.order_by, self.frame = exprs
def as_sql(self, compiler, connection, template=None):
connection.ops.check_expression_support(self)
if not connection.features.supports_over_clause:
raise NotSupportedError('This backend does not support window expressions.')
expr_sql, params = compiler.compile(self.source_expression)
window_sql, window_params = [], []
if self.partition_by is not None:
sql_expr, sql_params = self.partition_by.as_sql(
compiler=compiler, connection=connection,
template='PARTITION BY %(expressions)s',
)
window_sql.extend(sql_expr)
window_params.extend(sql_params)
if self.order_by is not None:
window_sql.append(' ORDER BY ')
order_sql, order_params = compiler.compile(self.order_by)
window_sql.extend(order_sql)
window_params.extend(order_params)
if self.frame:
frame_sql, frame_params = compiler.compile(self.frame)
window_sql.append(' ' + frame_sql)
window_params.extend(frame_params)
params.extend(window_params)
template = template or self.template
return template % {
'expression': expr_sql,
'window': ''.join(window_sql).strip()
}, params
def __str__(self):
return '{} OVER ({}{}{})'.format(
str(self.source_expression),
'PARTITION BY ' + str(self.partition_by) if self.partition_by else '',
'ORDER BY ' + str(self.order_by) if self.order_by else '',
str(self.frame or ''),
)
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self)
def get_group_by_cols(self, alias=None):
return []
class WindowFrame(Expression):
"""
Model the frame clause in window expressions. There are two types of frame
clauses which are subclasses, however, all processing and validation (by no
means intended to be complete) is done here. Thus, providing an end for a
frame is optional (the default is UNBOUNDED FOLLOWING, which is the last
row in the frame).
"""
template = '%(frame_type)s BETWEEN %(start)s AND %(end)s'
def __init__(self, start=None, end=None):
self.start = Value(start)
self.end = Value(end)
def set_source_expressions(self, exprs):
self.start, self.end = exprs
def get_source_expressions(self):
return [self.start, self.end]
def as_sql(self, compiler, connection):
connection.ops.check_expression_support(self)
start, end = self.window_frame_start_end(connection, self.start.value, self.end.value)
return self.template % {
'frame_type': self.frame_type,
'start': start,
'end': end,
}, []
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self)
def get_group_by_cols(self, alias=None):
return []
def __str__(self):
if self.start.value is not None and self.start.value < 0:
start = '%d %s' % (abs(self.start.value), connection.ops.PRECEDING)
elif self.start.value is not None and self.start.value == 0:
start = connection.ops.CURRENT_ROW
else:
start = connection.ops.UNBOUNDED_PRECEDING
if self.end.value is not None and self.end.value > 0:
end = '%d %s' % (self.end.value, connection.ops.FOLLOWING)
elif self.end.value is not None and self.end.value == 0:
end = connection.ops.CURRENT_ROW
else:
end = connection.ops.UNBOUNDED_FOLLOWING
return self.template % {
'frame_type': self.frame_type,
'start': start,
'end': end,
}
def window_frame_start_end(self, connection, start, end):
raise NotImplementedError('Subclasses must implement window_frame_start_end().')
class RowRange(WindowFrame):
frame_type = 'ROWS'
def window_frame_start_end(self, connection, start, end):
return connection.ops.window_frame_rows_start_end(start, end)
class ValueRange(WindowFrame):
frame_type = 'RANGE'
def window_frame_start_end(self, connection, start, end):
return connection.ops.window_frame_range_start_end(start, end)
|
60889b0b4b94ec745a64027516e9f1c4ed8021c3d912f2f519a4374a08865155 | import operator
from collections import Counter, defaultdict
from functools import partial, reduce
from itertools import chain
from operator import attrgetter
from django.db import IntegrityError, connections, transaction
from django.db.models import query_utils, signals, sql
class ProtectedError(IntegrityError):
def __init__(self, msg, protected_objects):
self.protected_objects = protected_objects
super().__init__(msg, protected_objects)
class RestrictedError(IntegrityError):
def __init__(self, msg, restricted_objects):
self.restricted_objects = restricted_objects
super().__init__(msg, restricted_objects)
def CASCADE(collector, field, sub_objs, using):
collector.collect(
sub_objs, source=field.remote_field.model, source_attr=field.name,
nullable=field.null, fail_on_restricted=False,
)
if field.null and not connections[using].features.can_defer_constraint_checks:
collector.add_field_update(field, None, sub_objs)
def PROTECT(collector, field, sub_objs, using):
raise ProtectedError(
"Cannot delete some instances of model '%s' because they are "
"referenced through a protected foreign key: '%s.%s'" % (
field.remote_field.model.__name__, sub_objs[0].__class__.__name__, field.name
),
sub_objs
)
def RESTRICT(collector, field, sub_objs, using):
collector.add_restricted_objects(field, sub_objs)
collector.add_dependency(field.remote_field.model, field.model)
def SET(value):
if callable(value):
def set_on_delete(collector, field, sub_objs, using):
collector.add_field_update(field, value(), sub_objs)
else:
def set_on_delete(collector, field, sub_objs, using):
collector.add_field_update(field, value, sub_objs)
set_on_delete.deconstruct = lambda: ('django.db.models.SET', (value,), {})
return set_on_delete
def SET_NULL(collector, field, sub_objs, using):
collector.add_field_update(field, None, sub_objs)
def SET_DEFAULT(collector, field, sub_objs, using):
collector.add_field_update(field, field.get_default(), sub_objs)
def DO_NOTHING(collector, field, sub_objs, using):
pass
def get_candidate_relations_to_delete(opts):
# The candidate relations are the ones that come from N-1 and 1-1 relations.
# N-N (i.e., many-to-many) relations aren't candidates for deletion.
return (
f for f in opts.get_fields(include_hidden=True)
if f.auto_created and not f.concrete and (f.one_to_one or f.one_to_many)
)
class Collector:
def __init__(self, using):
self.using = using
# Initially, {model: {instances}}, later values become lists.
self.data = defaultdict(set)
# {model: {(field, value): {instances}}}
self.field_updates = defaultdict(partial(defaultdict, set))
# {model: {field: {instances}}}
self.restricted_objects = defaultdict(partial(defaultdict, set))
# fast_deletes is a list of queryset-likes that can be deleted without
# fetching the objects into memory.
self.fast_deletes = []
# Tracks deletion-order dependency for databases without transactions
# or ability to defer constraint checks. Only concrete model classes
# should be included, as the dependencies exist only between actual
# database tables; proxy models are represented here by their concrete
# parent.
self.dependencies = defaultdict(set) # {model: {models}}
def add(self, objs, source=None, nullable=False, reverse_dependency=False):
"""
Add 'objs' to the collection of objects to be deleted. If the call is
the result of a cascade, 'source' should be the model that caused it,
and 'nullable' should be set to True if the relation can be null.
Return a list of all objects that were not already collected.
"""
if not objs:
return []
new_objs = []
model = objs[0].__class__
instances = self.data[model]
for obj in objs:
if obj not in instances:
new_objs.append(obj)
instances.update(new_objs)
# Nullable relationships can be ignored -- they are nulled out before
# deleting, and therefore do not affect the order in which objects have
# to be deleted.
if source is not None and not nullable:
self.add_dependency(source, model, reverse_dependency=reverse_dependency)
return new_objs
def add_dependency(self, model, dependency, reverse_dependency=False):
if reverse_dependency:
model, dependency = dependency, model
self.dependencies[model._meta.concrete_model].add(dependency._meta.concrete_model)
self.data.setdefault(dependency, self.data.default_factory())
def add_field_update(self, field, value, objs):
"""
Schedule a field update. 'objs' must be a homogeneous iterable
collection of model instances (e.g. a QuerySet).
"""
if not objs:
return
model = objs[0].__class__
self.field_updates[model][field, value].update(objs)
def add_restricted_objects(self, field, objs):
if objs:
model = objs[0].__class__
self.restricted_objects[model][field].update(objs)
def clear_restricted_objects_from_set(self, model, objs):
if model in self.restricted_objects:
self.restricted_objects[model] = {
field: items - objs
for field, items in self.restricted_objects[model].items()
}
def clear_restricted_objects_from_queryset(self, model, qs):
if model in self.restricted_objects:
objs = set(qs.filter(pk__in=[
obj.pk
for objs in self.restricted_objects[model].values() for obj in objs
]))
self.clear_restricted_objects_from_set(model, objs)
def _has_signal_listeners(self, model):
return (
signals.pre_delete.has_listeners(model) or
signals.post_delete.has_listeners(model)
)
def can_fast_delete(self, objs, from_field=None):
"""
Determine if the objects in the given queryset-like or single object
can be fast-deleted. This can be done if there are no cascades, no
parents and no signal listeners for the object class.
The 'from_field' tells where we are coming from - we need this to
determine if the objects are in fact to be deleted. Allow also
skipping parent -> child -> parent chain preventing fast delete of
the child.
"""
if from_field and from_field.remote_field.on_delete is not CASCADE:
return False
if hasattr(objs, '_meta'):
model = objs._meta.model
elif hasattr(objs, 'model') and hasattr(objs, '_raw_delete'):
model = objs.model
else:
return False
if self._has_signal_listeners(model):
return False
# The use of from_field comes from the need to avoid cascade back to
# parent when parent delete is cascading to child.
opts = model._meta
return (
all(link == from_field for link in opts.concrete_model._meta.parents.values()) and
# Foreign keys pointing to this model.
all(
related.field.remote_field.on_delete is DO_NOTHING
for related in get_candidate_relations_to_delete(opts)
) and (
# Something like generic foreign key.
not any(hasattr(field, 'bulk_related_objects') for field in opts.private_fields)
)
)
def get_del_batches(self, objs, fields):
"""
Return the objs in suitably sized batches for the used connection.
"""
field_names = [field.name for field in fields]
conn_batch_size = max(
connections[self.using].ops.bulk_batch_size(field_names, objs), 1)
if len(objs) > conn_batch_size:
return [objs[i:i + conn_batch_size]
for i in range(0, len(objs), conn_batch_size)]
else:
return [objs]
def collect(self, objs, source=None, nullable=False, collect_related=True,
source_attr=None, reverse_dependency=False, keep_parents=False,
fail_on_restricted=True):
"""
Add 'objs' to the collection of objects to be deleted as well as all
parent instances. 'objs' must be a homogeneous iterable collection of
model instances (e.g. a QuerySet). If 'collect_related' is True,
related objects will be handled by their respective on_delete handler.
If the call is the result of a cascade, 'source' should be the model
that caused it and 'nullable' should be set to True, if the relation
can be null.
If 'reverse_dependency' is True, 'source' will be deleted before the
current model, rather than after. (Needed for cascading to parent
models, the one case in which the cascade follows the forwards
direction of an FK rather than the reverse direction.)
If 'keep_parents' is True, data of parent model's will be not deleted.
If 'fail_on_restricted' is False, error won't be raised even if it's
prohibited to delete such objects due to RESTRICT, that defers
restricted object checking in recursive calls where the top-level call
may need to collect more objects to determine whether restricted ones
can be deleted.
"""
if self.can_fast_delete(objs):
self.fast_deletes.append(objs)
return
new_objs = self.add(objs, source, nullable,
reverse_dependency=reverse_dependency)
if not new_objs:
return
model = new_objs[0].__class__
if not keep_parents:
# Recursively collect concrete model's parent models, but not their
# related objects. These will be found by meta.get_fields()
concrete_model = model._meta.concrete_model
for ptr in concrete_model._meta.parents.values():
if ptr:
parent_objs = [getattr(obj, ptr.name) for obj in new_objs]
self.collect(parent_objs, source=model,
source_attr=ptr.remote_field.related_name,
collect_related=False,
reverse_dependency=True,
fail_on_restricted=False)
if not collect_related:
return
if keep_parents:
parents = set(model._meta.get_parent_list())
model_fast_deletes = defaultdict(list)
protected_objects = defaultdict(list)
for related in get_candidate_relations_to_delete(model._meta):
# Preserve parent reverse relationships if keep_parents=True.
if keep_parents and related.model in parents:
continue
field = related.field
if field.remote_field.on_delete == DO_NOTHING:
continue
related_model = related.related_model
if self.can_fast_delete(related_model, from_field=field):
model_fast_deletes[related_model].append(field)
continue
batches = self.get_del_batches(new_objs, [field])
for batch in batches:
sub_objs = self.related_objects(related_model, [field], batch)
# Non-referenced fields can be deferred if no signal receivers
# are connected for the related model as they'll never be
# exposed to the user. Skip field deferring when some
# relationships are select_related as interactions between both
# features are hard to get right. This should only happen in
# the rare cases where .related_objects is overridden anyway.
if not (sub_objs.query.select_related or self._has_signal_listeners(related_model)):
referenced_fields = set(chain.from_iterable(
(rf.attname for rf in rel.field.foreign_related_fields)
for rel in get_candidate_relations_to_delete(related_model._meta)
))
sub_objs = sub_objs.only(*tuple(referenced_fields))
if sub_objs:
try:
field.remote_field.on_delete(self, field, sub_objs, self.using)
except ProtectedError as error:
key = "'%s.%s'" % (field.model.__name__, field.name)
protected_objects[key] += error.protected_objects
if protected_objects:
raise ProtectedError(
'Cannot delete some instances of model %r because they are '
'referenced through protected foreign keys: %s.' % (
model.__name__,
', '.join(protected_objects),
),
chain.from_iterable(protected_objects.values()),
)
for related_model, related_fields in model_fast_deletes.items():
batches = self.get_del_batches(new_objs, related_fields)
for batch in batches:
sub_objs = self.related_objects(related_model, related_fields, batch)
self.fast_deletes.append(sub_objs)
for field in model._meta.private_fields:
if hasattr(field, 'bulk_related_objects'):
# It's something like generic foreign key.
sub_objs = field.bulk_related_objects(new_objs, self.using)
self.collect(sub_objs, source=model, nullable=True, fail_on_restricted=False)
if fail_on_restricted:
# Raise an error if collected restricted objects (RESTRICT) aren't
# candidates for deletion also collected via CASCADE.
for related_model, instances in self.data.items():
self.clear_restricted_objects_from_set(related_model, instances)
for qs in self.fast_deletes:
self.clear_restricted_objects_from_queryset(qs.model, qs)
if self.restricted_objects.values():
restricted_objects = defaultdict(list)
for related_model, fields in self.restricted_objects.items():
for field, objs in fields.items():
if objs:
key = "'%s.%s'" % (related_model.__name__, field.name)
restricted_objects[key] += objs
if restricted_objects:
raise RestrictedError(
'Cannot delete some instances of model %r because '
'they are referenced through restricted foreign keys: '
'%s.' % (
model.__name__,
', '.join(restricted_objects),
),
chain.from_iterable(restricted_objects.values()),
)
def related_objects(self, related_model, related_fields, objs):
"""
Get a QuerySet of the related model to objs via related fields.
"""
predicate = reduce(operator.or_, (
query_utils.Q(**{'%s__in' % related_field.name: objs})
for related_field in related_fields
))
return related_model._base_manager.using(self.using).filter(predicate)
def instances_with_model(self):
for model, instances in self.data.items():
for obj in instances:
yield model, obj
def sort(self):
sorted_models = []
concrete_models = set()
models = list(self.data)
while len(sorted_models) < len(models):
found = False
for model in models:
if model in sorted_models:
continue
dependencies = self.dependencies.get(model._meta.concrete_model)
if not (dependencies and dependencies.difference(concrete_models)):
sorted_models.append(model)
concrete_models.add(model._meta.concrete_model)
found = True
if not found:
return
self.data = {model: self.data[model] for model in sorted_models}
def delete(self):
# sort instance collections
for model, instances in self.data.items():
self.data[model] = sorted(instances, key=attrgetter("pk"))
# if possible, bring the models in an order suitable for databases that
# don't support transactions or cannot defer constraint checks until the
# end of a transaction.
self.sort()
# number of objects deleted for each model label
deleted_counter = Counter()
# Optimize for the case with a single obj and no dependencies
if len(self.data) == 1 and len(instances) == 1:
instance = list(instances)[0]
if self.can_fast_delete(instance):
with transaction.mark_for_rollback_on_error():
count = sql.DeleteQuery(model).delete_batch([instance.pk], self.using)
setattr(instance, model._meta.pk.attname, None)
return count, {model._meta.label: count}
with transaction.atomic(using=self.using, savepoint=False):
# send pre_delete signals
for model, obj in self.instances_with_model():
if not model._meta.auto_created:
signals.pre_delete.send(
sender=model, instance=obj, using=self.using
)
# fast deletes
for qs in self.fast_deletes:
count = qs._raw_delete(using=self.using)
deleted_counter[qs.model._meta.label] += count
# update fields
for model, instances_for_fieldvalues in self.field_updates.items():
for (field, value), instances in instances_for_fieldvalues.items():
query = sql.UpdateQuery(model)
query.update_batch([obj.pk for obj in instances],
{field.name: value}, self.using)
# reverse instance collections
for instances in self.data.values():
instances.reverse()
# delete instances
for model, instances in self.data.items():
query = sql.DeleteQuery(model)
pk_list = [obj.pk for obj in instances]
count = query.delete_batch(pk_list, self.using)
deleted_counter[model._meta.label] += count
if not model._meta.auto_created:
for obj in instances:
signals.post_delete.send(
sender=model, instance=obj, using=self.using
)
# update collected instances
for instances_for_fieldvalues in self.field_updates.values():
for (field, value), instances in instances_for_fieldvalues.items():
for obj in instances:
setattr(obj, field.attname, value)
for model, instances in self.data.items():
for instance in instances:
setattr(instance, model._meta.pk.attname, None)
return sum(deleted_counter.values()), dict(deleted_counter)
|
ddfbdcca90430f44cee3604e2e133c4a84812d3e5af40e87cc56b815409b33fb | import datetime
import decimal
import functools
import hashlib
import logging
import time
from contextlib import contextmanager
from django.db import NotSupportedError
logger = logging.getLogger('django.db.backends')
class CursorWrapper:
def __init__(self, cursor, db):
self.cursor = cursor
self.db = db
WRAP_ERROR_ATTRS = frozenset(['fetchone', 'fetchmany', 'fetchall', 'nextset'])
def __getattr__(self, attr):
cursor_attr = getattr(self.cursor, attr)
if attr in CursorWrapper.WRAP_ERROR_ATTRS:
return self.db.wrap_database_errors(cursor_attr)
else:
return cursor_attr
def __iter__(self):
with self.db.wrap_database_errors:
yield from self.cursor
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
# Close instead of passing through to avoid backend-specific behavior
# (#17671). Catch errors liberally because errors in cleanup code
# aren't useful.
try:
self.close()
except self.db.Database.Error:
pass
# The following methods cannot be implemented in __getattr__, because the
# code must run when the method is invoked, not just when it is accessed.
def callproc(self, procname, params=None, kparams=None):
# Keyword parameters for callproc aren't supported in PEP 249, but the
# database driver may support them (e.g. cx_Oracle).
if kparams is not None and not self.db.features.supports_callproc_kwargs:
raise NotSupportedError(
'Keyword parameters for callproc are not supported on this '
'database backend.'
)
self.db.validate_no_broken_transaction()
with self.db.wrap_database_errors:
if params is None and kparams is None:
return self.cursor.callproc(procname)
elif kparams is None:
return self.cursor.callproc(procname, params)
else:
params = params or ()
return self.cursor.callproc(procname, params, kparams)
def execute(self, sql, params=None):
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
def executemany(self, sql, param_list):
return self._execute_with_wrappers(sql, param_list, many=True, executor=self._executemany)
def _execute_with_wrappers(self, sql, params, many, executor):
context = {'connection': self.db, 'cursor': self}
for wrapper in reversed(self.db.execute_wrappers):
executor = functools.partial(wrapper, executor)
return executor(sql, params, many, context)
def _execute(self, sql, params, *ignored_wrapper_args):
self.db.validate_no_broken_transaction()
with self.db.wrap_database_errors:
if params is None:
# params default might be backend specific.
return self.cursor.execute(sql)
else:
return self.cursor.execute(sql, params)
def _executemany(self, sql, param_list, *ignored_wrapper_args):
self.db.validate_no_broken_transaction()
with self.db.wrap_database_errors:
return self.cursor.executemany(sql, param_list)
class CursorDebugWrapper(CursorWrapper):
# XXX callproc isn't instrumented at this time.
def execute(self, sql, params=None):
with self.debug_sql(sql, params, use_last_executed_query=True):
return super().execute(sql, params)
def executemany(self, sql, param_list):
with self.debug_sql(sql, param_list, many=True):
return super().executemany(sql, param_list)
@contextmanager
def debug_sql(self, sql=None, params=None, use_last_executed_query=False, many=False):
start = time.monotonic()
try:
yield
finally:
stop = time.monotonic()
duration = stop - start
if use_last_executed_query:
sql = self.db.ops.last_executed_query(self.cursor, sql, params)
try:
times = len(params) if many else ''
except TypeError:
# params could be an iterator.
times = '?'
self.db.queries_log.append({
'sql': '%s times: %s' % (times, sql) if many else sql,
'time': '%.3f' % duration,
})
logger.debug(
'(%.3f) %s; args=%s',
duration,
sql,
params,
extra={'duration': duration, 'sql': sql, 'params': params},
)
###############################################
# Converters from database (string) to Python #
###############################################
def typecast_date(s):
return datetime.date(*map(int, s.split('-'))) if s else None # return None if s is null
def typecast_time(s): # does NOT store time zone information
if not s:
return None
hour, minutes, seconds = s.split(':')
if '.' in seconds: # check whether seconds have a fractional part
seconds, microseconds = seconds.split('.')
else:
microseconds = '0'
return datetime.time(int(hour), int(minutes), int(seconds), int((microseconds + '000000')[:6]))
def typecast_timestamp(s): # does NOT store time zone information
# "2005-07-29 15:48:00.590358-05"
# "2005-07-29 09:56:00-05"
if not s:
return None
if ' ' not in s:
return typecast_date(s)
d, t = s.split()
# Remove timezone information.
if '-' in t:
t, _ = t.split('-', 1)
elif '+' in t:
t, _ = t.split('+', 1)
dates = d.split('-')
times = t.split(':')
seconds = times[2]
if '.' in seconds: # check whether seconds have a fractional part
seconds, microseconds = seconds.split('.')
else:
microseconds = '0'
return datetime.datetime(
int(dates[0]), int(dates[1]), int(dates[2]),
int(times[0]), int(times[1]), int(seconds),
int((microseconds + '000000')[:6])
)
###############################################
# Converters from Python to database (string) #
###############################################
def split_identifier(identifier):
"""
Split a SQL identifier into a two element tuple of (namespace, name).
The identifier could be a table, column, or sequence name might be prefixed
by a namespace.
"""
try:
namespace, name = identifier.split('"."')
except ValueError:
namespace, name = '', identifier
return namespace.strip('"'), name.strip('"')
def truncate_name(identifier, length=None, hash_len=4):
"""
Shorten a SQL identifier to a repeatable mangled version with the given
length.
If a quote stripped name contains a namespace, e.g. USERNAME"."TABLE,
truncate the table portion only.
"""
namespace, name = split_identifier(identifier)
if length is None or len(name) <= length:
return identifier
digest = names_digest(name, length=hash_len)
return '%s%s%s' % ('%s"."' % namespace if namespace else '', name[:length - hash_len], digest)
def names_digest(*args, length):
"""
Generate a 32-bit digest of a set of arguments that can be used to shorten
identifying names.
"""
h = hashlib.md5()
for arg in args:
h.update(arg.encode())
return h.hexdigest()[:length]
def format_number(value, max_digits, decimal_places):
"""
Format a number into a string with the requisite number of digits and
decimal places.
"""
if value is None:
return None
context = decimal.getcontext().copy()
if max_digits is not None:
context.prec = max_digits
if decimal_places is not None:
value = value.quantize(decimal.Decimal(1).scaleb(-decimal_places), context=context)
else:
context.traps[decimal.Rounded] = 1
value = context.create_decimal(value)
return "{:f}".format(value)
def strip_quotes(table_name):
"""
Strip quotes off of quoted table names to make them safe for use in index
names, sequence names, etc. For example '"USER"."TABLE"' (an Oracle naming
scheme) becomes 'USER"."TABLE'.
"""
has_quotes = table_name.startswith('"') and table_name.endswith('"')
return table_name[1:-1] if has_quotes else table_name
|
657e863e681014467806fabdedf825fb9a90ad7a7b1a3de08f60e046d5c1c06f | from django.core.exceptions import FieldDoesNotExist
from django.db.models import NOT_PROVIDED
from django.utils.functional import cached_property
from .base import Operation
from .utils import (
ModelTuple, field_references_model, is_referenced_by_foreign_key,
)
class FieldOperation(Operation):
def __init__(self, model_name, name, field=None):
self.model_name = model_name
self.name = name
self.field = field
@cached_property
def model_name_lower(self):
return self.model_name.lower()
@cached_property
def name_lower(self):
return self.name.lower()
def is_same_model_operation(self, operation):
return self.model_name_lower == operation.model_name_lower
def is_same_field_operation(self, operation):
return self.is_same_model_operation(operation) and self.name_lower == operation.name_lower
def references_model(self, name, app_label=None):
name_lower = name.lower()
if name_lower == self.model_name_lower:
return True
if self.field:
return field_references_model(self.field, ModelTuple(app_label, name_lower))
return False
def references_field(self, model_name, name, app_label=None):
model_name_lower = model_name.lower()
# Check if this operation locally references the field.
if model_name_lower == self.model_name_lower:
if name == self.name:
return True
elif self.field and hasattr(self.field, 'from_fields') and name in self.field.from_fields:
return True
# Check if this operation remotely references the field.
if self.field:
model_tuple = ModelTuple(app_label, model_name_lower)
remote_field = self.field.remote_field
if remote_field:
if (ModelTuple.from_model(remote_field.model) == model_tuple and
(not hasattr(self.field, 'to_fields') or
name in self.field.to_fields or None in self.field.to_fields)):
return True
through = getattr(remote_field, 'through', None)
if (through and ModelTuple.from_model(through) == model_tuple and
(getattr(remote_field, 'through_fields', None) is None or
name in remote_field.through_fields)):
return True
return False
def reduce(self, operation, app_label=None):
return (
super().reduce(operation, app_label=app_label) or
not operation.references_field(self.model_name, self.name, app_label)
)
class AddField(FieldOperation):
"""Add a field to a model."""
def __init__(self, model_name, name, field, preserve_default=True):
self.preserve_default = preserve_default
super().__init__(model_name, name, field)
def deconstruct(self):
kwargs = {
'model_name': self.model_name,
'name': self.name,
'field': self.field,
}
if self.preserve_default is not True:
kwargs['preserve_default'] = self.preserve_default
return (
self.__class__.__name__,
[],
kwargs
)
def state_forwards(self, app_label, state):
# If preserve default is off, don't use the default for future state
if not self.preserve_default:
field = self.field.clone()
field.default = NOT_PROVIDED
else:
field = self.field
state.models[app_label, self.model_name_lower].fields.append((self.name, field))
# Delay rendering of relationships if it's not a relational field
delay = not field.is_relation
state.reload_model(app_label, self.model_name_lower, delay=delay)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
to_model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
from_model = from_state.apps.get_model(app_label, self.model_name)
field = to_model._meta.get_field(self.name)
if not self.preserve_default:
field.default = self.field.default
schema_editor.add_field(
from_model,
field,
)
if not self.preserve_default:
field.default = NOT_PROVIDED
def database_backwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, from_model):
schema_editor.remove_field(from_model, from_model._meta.get_field(self.name))
def describe(self):
return "Add field %s to %s" % (self.name, self.model_name)
def reduce(self, operation, app_label=None):
if isinstance(operation, FieldOperation) and self.is_same_field_operation(operation):
if isinstance(operation, AlterField):
return [
AddField(
model_name=self.model_name,
name=operation.name,
field=operation.field,
),
]
elif isinstance(operation, RemoveField):
return []
elif isinstance(operation, RenameField):
return [
AddField(
model_name=self.model_name,
name=operation.new_name,
field=self.field,
),
]
return super().reduce(operation, app_label=app_label)
class RemoveField(FieldOperation):
"""Remove a field from a model."""
def deconstruct(self):
kwargs = {
'model_name': self.model_name,
'name': self.name,
}
return (
self.__class__.__name__,
[],
kwargs
)
def state_forwards(self, app_label, state):
new_fields = []
old_field = None
for name, instance in state.models[app_label, self.model_name_lower].fields:
if name != self.name:
new_fields.append((name, instance))
else:
old_field = instance
state.models[app_label, self.model_name_lower].fields = new_fields
# Delay rendering of relationships if it's not a relational field
delay = not old_field.is_relation
state.reload_model(app_label, self.model_name_lower, delay=delay)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, from_model):
schema_editor.remove_field(from_model, from_model._meta.get_field(self.name))
def database_backwards(self, app_label, schema_editor, from_state, to_state):
to_model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
from_model = from_state.apps.get_model(app_label, self.model_name)
schema_editor.add_field(from_model, to_model._meta.get_field(self.name))
def describe(self):
return "Remove field %s from %s" % (self.name, self.model_name)
def reduce(self, operation, app_label=None):
from .models import DeleteModel
if isinstance(operation, DeleteModel) and operation.name_lower == self.model_name_lower:
return [operation]
return super().reduce(operation, app_label=app_label)
class AlterField(FieldOperation):
"""
Alter a field's database column (e.g. null, max_length) to the provided
new field.
"""
def __init__(self, model_name, name, field, preserve_default=True):
self.preserve_default = preserve_default
super().__init__(model_name, name, field)
def deconstruct(self):
kwargs = {
'model_name': self.model_name,
'name': self.name,
'field': self.field,
}
if self.preserve_default is not True:
kwargs['preserve_default'] = self.preserve_default
return (
self.__class__.__name__,
[],
kwargs
)
def state_forwards(self, app_label, state):
if not self.preserve_default:
field = self.field.clone()
field.default = NOT_PROVIDED
else:
field = self.field
state.models[app_label, self.model_name_lower].fields = [
(n, field if n == self.name else f)
for n, f in
state.models[app_label, self.model_name_lower].fields
]
# TODO: investigate if old relational fields must be reloaded or if it's
# sufficient if the new field is (#27737).
# Delay rendering of relationships if it's not a relational field and
# not referenced by a foreign key.
delay = (
not field.is_relation and
not is_referenced_by_foreign_key(state, self.model_name_lower, self.field, self.name)
)
state.reload_model(app_label, self.model_name_lower, delay=delay)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
to_model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
from_model = from_state.apps.get_model(app_label, self.model_name)
from_field = from_model._meta.get_field(self.name)
to_field = to_model._meta.get_field(self.name)
if not self.preserve_default:
to_field.default = self.field.default
schema_editor.alter_field(from_model, from_field, to_field)
if not self.preserve_default:
to_field.default = NOT_PROVIDED
def database_backwards(self, app_label, schema_editor, from_state, to_state):
self.database_forwards(app_label, schema_editor, from_state, to_state)
def describe(self):
return "Alter field %s on %s" % (self.name, self.model_name)
def reduce(self, operation, app_label=None):
if isinstance(operation, RemoveField) and self.is_same_field_operation(operation):
return [operation]
elif isinstance(operation, RenameField) and self.is_same_field_operation(operation):
return [
operation,
AlterField(
model_name=self.model_name,
name=operation.new_name,
field=self.field,
),
]
return super().reduce(operation, app_label=app_label)
class RenameField(FieldOperation):
"""Rename a field on the model. Might affect db_column too."""
def __init__(self, model_name, old_name, new_name):
self.old_name = old_name
self.new_name = new_name
super().__init__(model_name, old_name)
@cached_property
def old_name_lower(self):
return self.old_name.lower()
@cached_property
def new_name_lower(self):
return self.new_name.lower()
def deconstruct(self):
kwargs = {
'model_name': self.model_name,
'old_name': self.old_name,
'new_name': self.new_name,
}
return (
self.__class__.__name__,
[],
kwargs
)
def state_forwards(self, app_label, state):
model_state = state.models[app_label, self.model_name_lower]
# Rename the field
fields = model_state.fields
found = False
delay = True
for index, (name, field) in enumerate(fields):
if not found and name == self.old_name:
fields[index] = (self.new_name, field)
found = True
# Fix from_fields to refer to the new field.
from_fields = getattr(field, 'from_fields', None)
if from_fields:
field.from_fields = tuple([
self.new_name if from_field_name == self.old_name else from_field_name
for from_field_name in from_fields
])
# Delay rendering of relationships if it's not a relational
# field and not referenced by a foreign key.
delay = delay and (
not field.is_relation and
not is_referenced_by_foreign_key(state, self.model_name_lower, field, self.name)
)
if not found:
raise FieldDoesNotExist(
"%s.%s has no field named '%s'" % (app_label, self.model_name, self.old_name)
)
# Fix index/unique_together to refer to the new field
options = model_state.options
for option in ('index_together', 'unique_together'):
if option in options:
options[option] = [
[self.new_name if n == self.old_name else n for n in together]
for together in options[option]
]
# Fix to_fields to refer to the new field.
model_tuple = app_label, self.model_name_lower
for (model_app_label, model_name), model_state in state.models.items():
for index, (name, field) in enumerate(model_state.fields):
remote_field = field.remote_field
if remote_field:
remote_model_tuple = self._get_model_tuple(
remote_field.model, model_app_label, model_name
)
if remote_model_tuple == model_tuple:
if getattr(remote_field, 'field_name', None) == self.old_name:
remote_field.field_name = self.new_name
to_fields = getattr(field, 'to_fields', None)
if to_fields:
field.to_fields = tuple([
self.new_name if to_field_name == self.old_name else to_field_name
for to_field_name in to_fields
])
state.reload_model(app_label, self.model_name_lower, delay=delay)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
to_model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
from_model = from_state.apps.get_model(app_label, self.model_name)
schema_editor.alter_field(
from_model,
from_model._meta.get_field(self.old_name),
to_model._meta.get_field(self.new_name),
)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
to_model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
from_model = from_state.apps.get_model(app_label, self.model_name)
schema_editor.alter_field(
from_model,
from_model._meta.get_field(self.new_name),
to_model._meta.get_field(self.old_name),
)
def describe(self):
return "Rename field %s on %s to %s" % (self.old_name, self.model_name, self.new_name)
def references_field(self, model_name, name, app_label=None):
return self.references_model(model_name) and (
name.lower() == self.old_name_lower or
name.lower() == self.new_name_lower
)
def reduce(self, operation, app_label=None):
if (isinstance(operation, RenameField) and
self.is_same_model_operation(operation) and
self.new_name_lower == operation.old_name_lower):
return [
RenameField(
self.model_name,
self.old_name,
operation.new_name,
),
]
# Skip `FieldOperation.reduce` as we want to run `references_field`
# against self.new_name.
return (
super(FieldOperation, self).reduce(operation, app_label=app_label) or
not operation.references_field(self.model_name, self.new_name, app_label)
)
|
2e75b24c6fc9383d40a071b5f6dce939b896411935c3dcff274995940ce8ebef | import functools
import inspect
from functools import partial
from django import forms
from django.apps import apps
from django.conf import SettingsReference
from django.core import checks, exceptions
from django.db import connection, router
from django.db.backends import utils
from django.db.models import Q
from django.db.models.constants import LOOKUP_SEP
from django.db.models.deletion import CASCADE, SET_DEFAULT, SET_NULL
from django.db.models.query_utils import PathInfo
from django.db.models.utils import make_model_tuple
from django.utils.functional import cached_property
from django.utils.translation import gettext_lazy as _
from . import Field
from .mixins import FieldCacheMixin
from .related_descriptors import (
ForeignKeyDeferredAttribute, ForwardManyToOneDescriptor,
ForwardOneToOneDescriptor, ManyToManyDescriptor,
ReverseManyToOneDescriptor, ReverseOneToOneDescriptor,
)
from .related_lookups import (
RelatedExact, RelatedGreaterThan, RelatedGreaterThanOrEqual, RelatedIn,
RelatedIsNull, RelatedLessThan, RelatedLessThanOrEqual,
)
from .reverse_related import (
ForeignObjectRel, ManyToManyRel, ManyToOneRel, OneToOneRel,
)
RECURSIVE_RELATIONSHIP_CONSTANT = 'self'
def resolve_relation(scope_model, relation):
"""
Transform relation into a model or fully-qualified model string of the form
"app_label.ModelName", relative to scope_model.
The relation argument can be:
* RECURSIVE_RELATIONSHIP_CONSTANT, i.e. the string "self", in which case
the model argument will be returned.
* A bare model name without an app_label, in which case scope_model's
app_label will be prepended.
* An "app_label.ModelName" string.
* A model class, which will be returned unchanged.
"""
# Check for recursive relations
if relation == RECURSIVE_RELATIONSHIP_CONSTANT:
relation = scope_model
# Look for an "app.Model" relation
if isinstance(relation, str):
if "." not in relation:
relation = "%s.%s" % (scope_model._meta.app_label, relation)
return relation
def lazy_related_operation(function, model, *related_models, **kwargs):
"""
Schedule `function` to be called once `model` and all `related_models`
have been imported and registered with the app registry. `function` will
be called with the newly-loaded model classes as its positional arguments,
plus any optional keyword arguments.
The `model` argument must be a model class. Each subsequent positional
argument is another model, or a reference to another model - see
`resolve_relation()` for the various forms these may take. Any relative
references will be resolved relative to `model`.
This is a convenience wrapper for `Apps.lazy_model_operation` - the app
registry model used is the one found in `model._meta.apps`.
"""
models = [model] + [resolve_relation(model, rel) for rel in related_models]
model_keys = (make_model_tuple(m) for m in models)
apps = model._meta.apps
return apps.lazy_model_operation(partial(function, **kwargs), *model_keys)
class RelatedField(FieldCacheMixin, Field):
"""Base class that all relational fields inherit from."""
# Field flags
one_to_many = False
one_to_one = False
many_to_many = False
many_to_one = False
@cached_property
def related_model(self):
# Can't cache this property until all the models are loaded.
apps.check_models_ready()
return self.remote_field.model
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_related_name_is_valid(),
*self._check_related_query_name_is_valid(),
*self._check_relation_model_exists(),
*self._check_referencing_to_swapped_model(),
*self._check_clashes(),
]
def _check_related_name_is_valid(self):
import keyword
related_name = self.remote_field.related_name
if related_name is None:
return []
is_valid_id = not keyword.iskeyword(related_name) and related_name.isidentifier()
if not (is_valid_id or related_name.endswith('+')):
return [
checks.Error(
"The name '%s' is invalid related_name for field %s.%s" %
(self.remote_field.related_name, self.model._meta.object_name,
self.name),
hint="Related name must be a valid Python identifier or end with a '+'",
obj=self,
id='fields.E306',
)
]
return []
def _check_related_query_name_is_valid(self):
if self.remote_field.is_hidden():
return []
rel_query_name = self.related_query_name()
errors = []
if rel_query_name.endswith('_'):
errors.append(
checks.Error(
"Reverse query name '%s' must not end with an underscore."
% (rel_query_name,),
hint=("Add or change a related_name or related_query_name "
"argument for this field."),
obj=self,
id='fields.E308',
)
)
if LOOKUP_SEP in rel_query_name:
errors.append(
checks.Error(
"Reverse query name '%s' must not contain '%s'."
% (rel_query_name, LOOKUP_SEP),
hint=("Add or change a related_name or related_query_name "
"argument for this field."),
obj=self,
id='fields.E309',
)
)
return errors
def _check_relation_model_exists(self):
rel_is_missing = self.remote_field.model not in self.opts.apps.get_models()
rel_is_string = isinstance(self.remote_field.model, str)
model_name = self.remote_field.model if rel_is_string else self.remote_field.model._meta.object_name
if rel_is_missing and (rel_is_string or not self.remote_field.model._meta.swapped):
return [
checks.Error(
"Field defines a relation with model '%s', which is either "
"not installed, or is abstract." % model_name,
obj=self,
id='fields.E300',
)
]
return []
def _check_referencing_to_swapped_model(self):
if (self.remote_field.model not in self.opts.apps.get_models() and
not isinstance(self.remote_field.model, str) and
self.remote_field.model._meta.swapped):
model = "%s.%s" % (
self.remote_field.model._meta.app_label,
self.remote_field.model._meta.object_name
)
return [
checks.Error(
"Field defines a relation with the model '%s', which has "
"been swapped out." % model,
hint="Update the relation to point at 'settings.%s'." % self.remote_field.model._meta.swappable,
obj=self,
id='fields.E301',
)
]
return []
def _check_clashes(self):
"""Check accessor and reverse query name clashes."""
from django.db.models.base import ModelBase
errors = []
opts = self.model._meta
# `f.remote_field.model` may be a string instead of a model. Skip if model name is
# not resolved.
if not isinstance(self.remote_field.model, ModelBase):
return []
# Consider that we are checking field `Model.foreign` and the models
# are:
#
# class Target(models.Model):
# model = models.IntegerField()
# model_set = models.IntegerField()
#
# class Model(models.Model):
# foreign = models.ForeignKey(Target)
# m2m = models.ManyToManyField(Target)
# rel_opts.object_name == "Target"
rel_opts = self.remote_field.model._meta
# If the field doesn't install a backward relation on the target model
# (so `is_hidden` returns True), then there are no clashes to check
# and we can skip these fields.
rel_is_hidden = self.remote_field.is_hidden()
rel_name = self.remote_field.get_accessor_name() # i. e. "model_set"
rel_query_name = self.related_query_name() # i. e. "model"
field_name = "%s.%s" % (opts.object_name, self.name) # i. e. "Model.field"
# Check clashes between accessor or reverse query name of `field`
# and any other field name -- i.e. accessor for Model.foreign is
# model_set and it clashes with Target.model_set.
potential_clashes = rel_opts.fields + rel_opts.many_to_many
for clash_field in potential_clashes:
clash_name = "%s.%s" % (rel_opts.object_name, clash_field.name) # i.e. "Target.model_set"
if not rel_is_hidden and clash_field.name == rel_name:
errors.append(
checks.Error(
"Reverse accessor for '%s' clashes with field name '%s'." % (field_name, clash_name),
hint=("Rename field '%s', or add/change a related_name "
"argument to the definition for field '%s'.") % (clash_name, field_name),
obj=self,
id='fields.E302',
)
)
if clash_field.name == rel_query_name:
errors.append(
checks.Error(
"Reverse query name for '%s' clashes with field name '%s'." % (field_name, clash_name),
hint=("Rename field '%s', or add/change a related_name "
"argument to the definition for field '%s'.") % (clash_name, field_name),
obj=self,
id='fields.E303',
)
)
# Check clashes between accessors/reverse query names of `field` and
# any other field accessor -- i. e. Model.foreign accessor clashes with
# Model.m2m accessor.
potential_clashes = (r for r in rel_opts.related_objects if r.field is not self)
for clash_field in potential_clashes:
clash_name = "%s.%s" % ( # i. e. "Model.m2m"
clash_field.related_model._meta.object_name,
clash_field.field.name)
if not rel_is_hidden and clash_field.get_accessor_name() == rel_name:
errors.append(
checks.Error(
"Reverse accessor for '%s' clashes with reverse accessor for '%s'." % (field_name, clash_name),
hint=("Add or change a related_name argument "
"to the definition for '%s' or '%s'.") % (field_name, clash_name),
obj=self,
id='fields.E304',
)
)
if clash_field.get_accessor_name() == rel_query_name:
errors.append(
checks.Error(
"Reverse query name for '%s' clashes with reverse query name for '%s'."
% (field_name, clash_name),
hint=("Add or change a related_name argument "
"to the definition for '%s' or '%s'.") % (field_name, clash_name),
obj=self,
id='fields.E305',
)
)
return errors
def db_type(self, connection):
# By default related field will not have a column as it relates to
# columns from another table.
return None
def contribute_to_class(self, cls, name, private_only=False, **kwargs):
super().contribute_to_class(cls, name, private_only=private_only, **kwargs)
self.opts = cls._meta
if not cls._meta.abstract:
if self.remote_field.related_name:
related_name = self.remote_field.related_name
else:
related_name = self.opts.default_related_name
if related_name:
related_name = related_name % {
'class': cls.__name__.lower(),
'model_name': cls._meta.model_name.lower(),
'app_label': cls._meta.app_label.lower()
}
self.remote_field.related_name = related_name
if self.remote_field.related_query_name:
related_query_name = self.remote_field.related_query_name % {
'class': cls.__name__.lower(),
'app_label': cls._meta.app_label.lower(),
}
self.remote_field.related_query_name = related_query_name
def resolve_related_class(model, related, field):
field.remote_field.model = related
field.do_related_class(related, model)
lazy_related_operation(resolve_related_class, cls, self.remote_field.model, field=self)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.remote_field.limit_choices_to:
kwargs['limit_choices_to'] = self.remote_field.limit_choices_to
if self.remote_field.related_name is not None:
kwargs['related_name'] = self.remote_field.related_name
if self.remote_field.related_query_name is not None:
kwargs['related_query_name'] = self.remote_field.related_query_name
return name, path, args, kwargs
def get_forward_related_filter(self, obj):
"""
Return the keyword arguments that when supplied to
self.model.object.filter(), would select all instances related through
this field to the remote obj. This is used to build the querysets
returned by related descriptors. obj is an instance of
self.related_field.model.
"""
return {
'%s__%s' % (self.name, rh_field.name): getattr(obj, rh_field.attname)
for _, rh_field in self.related_fields
}
def get_reverse_related_filter(self, obj):
"""
Complement to get_forward_related_filter(). Return the keyword
arguments that when passed to self.related_field.model.object.filter()
select all instances of self.related_field.model related through
this field to obj. obj is an instance of self.model.
"""
base_filter = {
rh_field.attname: getattr(obj, lh_field.attname)
for lh_field, rh_field in self.related_fields
}
descriptor_filter = self.get_extra_descriptor_filter(obj)
base_q = Q(**base_filter)
if isinstance(descriptor_filter, dict):
return base_q & Q(**descriptor_filter)
elif descriptor_filter:
return base_q & descriptor_filter
return base_q
@property
def swappable_setting(self):
"""
Get the setting that this is powered from for swapping, or None
if it's not swapped in / marked with swappable=False.
"""
if self.swappable:
# Work out string form of "to"
if isinstance(self.remote_field.model, str):
to_string = self.remote_field.model
else:
to_string = self.remote_field.model._meta.label
return apps.get_swappable_settings_name(to_string)
return None
def set_attributes_from_rel(self):
self.name = (
self.name or
(self.remote_field.model._meta.model_name + '_' + self.remote_field.model._meta.pk.name)
)
if self.verbose_name is None:
self.verbose_name = self.remote_field.model._meta.verbose_name
self.remote_field.set_field_name()
def do_related_class(self, other, cls):
self.set_attributes_from_rel()
self.contribute_to_related_class(other, self.remote_field)
def get_limit_choices_to(self):
"""
Return ``limit_choices_to`` for this model field.
If it is a callable, it will be invoked and the result will be
returned.
"""
if callable(self.remote_field.limit_choices_to):
return self.remote_field.limit_choices_to()
return self.remote_field.limit_choices_to
def formfield(self, **kwargs):
"""
Pass ``limit_choices_to`` to the field being constructed.
Only passes it if there is a type that supports related fields.
This is a similar strategy used to pass the ``queryset`` to the field
being constructed.
"""
defaults = {}
if hasattr(self.remote_field, 'get_related_field'):
# If this is a callable, do not invoke it here. Just pass
# it in the defaults for when the form class will later be
# instantiated.
limit_choices_to = self.remote_field.limit_choices_to
defaults.update({
'limit_choices_to': limit_choices_to,
})
defaults.update(kwargs)
return super().formfield(**defaults)
def related_query_name(self):
"""
Define the name that can be used to identify this related object in a
table-spanning query.
"""
return self.remote_field.related_query_name or self.remote_field.related_name or self.opts.model_name
@property
def target_field(self):
"""
When filtering against this relation, return the field on the remote
model against which the filtering should happen.
"""
target_fields = self.get_path_info()[-1].target_fields
if len(target_fields) > 1:
raise exceptions.FieldError(
"The relation has multiple target fields, but only single target field was asked for")
return target_fields[0]
def get_cache_name(self):
return self.name
class ForeignObject(RelatedField):
"""
Abstraction of the ForeignKey relation to support multi-column relations.
"""
# Field flags
many_to_many = False
many_to_one = True
one_to_many = False
one_to_one = False
requires_unique_target = True
related_accessor_class = ReverseManyToOneDescriptor
forward_related_accessor_class = ForwardManyToOneDescriptor
rel_class = ForeignObjectRel
def __init__(self, to, on_delete, from_fields, to_fields, rel=None, related_name=None,
related_query_name=None, limit_choices_to=None, parent_link=False,
swappable=True, **kwargs):
if rel is None:
rel = self.rel_class(
self, to,
related_name=related_name,
related_query_name=related_query_name,
limit_choices_to=limit_choices_to,
parent_link=parent_link,
on_delete=on_delete,
)
super().__init__(rel=rel, **kwargs)
self.from_fields = from_fields
self.to_fields = to_fields
self.swappable = swappable
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_to_fields_exist(),
*self._check_unique_target(),
]
def _check_to_fields_exist(self):
# Skip nonexistent models.
if isinstance(self.remote_field.model, str):
return []
errors = []
for to_field in self.to_fields:
if to_field:
try:
self.remote_field.model._meta.get_field(to_field)
except exceptions.FieldDoesNotExist:
errors.append(
checks.Error(
"The to_field '%s' doesn't exist on the related "
"model '%s'."
% (to_field, self.remote_field.model._meta.label),
obj=self,
id='fields.E312',
)
)
return errors
def _check_unique_target(self):
rel_is_string = isinstance(self.remote_field.model, str)
if rel_is_string or not self.requires_unique_target:
return []
try:
self.foreign_related_fields
except exceptions.FieldDoesNotExist:
return []
if not self.foreign_related_fields:
return []
unique_foreign_fields = {
frozenset([f.name])
for f in self.remote_field.model._meta.get_fields()
if getattr(f, 'unique', False)
}
unique_foreign_fields.update({
frozenset(ut)
for ut in self.remote_field.model._meta.unique_together
})
foreign_fields = {f.name for f in self.foreign_related_fields}
has_unique_constraint = any(u <= foreign_fields for u in unique_foreign_fields)
if not has_unique_constraint and len(self.foreign_related_fields) > 1:
field_combination = ', '.join(
"'%s'" % rel_field.name for rel_field in self.foreign_related_fields
)
model_name = self.remote_field.model.__name__
return [
checks.Error(
"No subset of the fields %s on model '%s' is unique."
% (field_combination, model_name),
hint=(
"Add unique=True on any of those fields or add at "
"least a subset of them to a unique_together constraint."
),
obj=self,
id='fields.E310',
)
]
elif not has_unique_constraint:
field_name = self.foreign_related_fields[0].name
model_name = self.remote_field.model.__name__
return [
checks.Error(
"'%s.%s' must set unique=True because it is referenced by "
"a foreign key." % (model_name, field_name),
obj=self,
id='fields.E311',
)
]
else:
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
kwargs['on_delete'] = self.remote_field.on_delete
kwargs['from_fields'] = self.from_fields
kwargs['to_fields'] = self.to_fields
if self.remote_field.parent_link:
kwargs['parent_link'] = self.remote_field.parent_link
# Work out string form of "to"
if isinstance(self.remote_field.model, str):
kwargs['to'] = self.remote_field.model
else:
kwargs['to'] = "%s.%s" % (
self.remote_field.model._meta.app_label,
self.remote_field.model._meta.object_name,
)
# If swappable is True, then see if we're actually pointing to the target
# of a swap.
swappable_setting = self.swappable_setting
if swappable_setting is not None:
# If it's already a settings reference, error
if hasattr(kwargs['to'], "setting_name"):
if kwargs['to'].setting_name != swappable_setting:
raise ValueError(
"Cannot deconstruct a ForeignKey pointing to a model "
"that is swapped in place of more than one model (%s and %s)"
% (kwargs['to'].setting_name, swappable_setting)
)
# Set it
kwargs['to'] = SettingsReference(
kwargs['to'],
swappable_setting,
)
return name, path, args, kwargs
def resolve_related_fields(self):
if not self.from_fields or len(self.from_fields) != len(self.to_fields):
raise ValueError('Foreign Object from and to fields must be the same non-zero length')
if isinstance(self.remote_field.model, str):
raise ValueError('Related model %r cannot be resolved' % self.remote_field.model)
related_fields = []
for index in range(len(self.from_fields)):
from_field_name = self.from_fields[index]
to_field_name = self.to_fields[index]
from_field = (
self
if from_field_name == RECURSIVE_RELATIONSHIP_CONSTANT
else self.opts.get_field(from_field_name)
)
to_field = (self.remote_field.model._meta.pk if to_field_name is None
else self.remote_field.model._meta.get_field(to_field_name))
related_fields.append((from_field, to_field))
return related_fields
@cached_property
def related_fields(self):
return self.resolve_related_fields()
@cached_property
def reverse_related_fields(self):
return [(rhs_field, lhs_field) for lhs_field, rhs_field in self.related_fields]
@cached_property
def local_related_fields(self):
return tuple(lhs_field for lhs_field, rhs_field in self.related_fields)
@cached_property
def foreign_related_fields(self):
return tuple(rhs_field for lhs_field, rhs_field in self.related_fields if rhs_field)
def get_local_related_value(self, instance):
return self.get_instance_value_for_fields(instance, self.local_related_fields)
def get_foreign_related_value(self, instance):
return self.get_instance_value_for_fields(instance, self.foreign_related_fields)
@staticmethod
def get_instance_value_for_fields(instance, fields):
ret = []
opts = instance._meta
for field in fields:
# Gotcha: in some cases (like fixture loading) a model can have
# different values in parent_ptr_id and parent's id. So, use
# instance.pk (that is, parent_ptr_id) when asked for instance.id.
if field.primary_key:
possible_parent_link = opts.get_ancestor_link(field.model)
if (not possible_parent_link or
possible_parent_link.primary_key or
possible_parent_link.model._meta.abstract):
ret.append(instance.pk)
continue
ret.append(getattr(instance, field.attname))
return tuple(ret)
def get_attname_column(self):
attname, column = super().get_attname_column()
return attname, None
def get_joining_columns(self, reverse_join=False):
source = self.reverse_related_fields if reverse_join else self.related_fields
return tuple((lhs_field.column, rhs_field.column) for lhs_field, rhs_field in source)
def get_reverse_joining_columns(self):
return self.get_joining_columns(reverse_join=True)
def get_extra_descriptor_filter(self, instance):
"""
Return an extra filter condition for related object fetching when
user does 'instance.fieldname', that is the extra filter is used in
the descriptor of the field.
The filter should be either a dict usable in .filter(**kwargs) call or
a Q-object. The condition will be ANDed together with the relation's
joining columns.
A parallel method is get_extra_restriction() which is used in
JOIN and subquery conditions.
"""
return {}
def get_extra_restriction(self, where_class, alias, related_alias):
"""
Return a pair condition used for joining and subquery pushdown. The
condition is something that responds to as_sql(compiler, connection)
method.
Note that currently referring both the 'alias' and 'related_alias'
will not work in some conditions, like subquery pushdown.
A parallel method is get_extra_descriptor_filter() which is used in
instance.fieldname related object fetching.
"""
return None
def get_path_info(self, filtered_relation=None):
"""Get path from this field to the related model."""
opts = self.remote_field.model._meta
from_opts = self.model._meta
return [PathInfo(
from_opts=from_opts,
to_opts=opts,
target_fields=self.foreign_related_fields,
join_field=self,
m2m=False,
direct=True,
filtered_relation=filtered_relation,
)]
def get_reverse_path_info(self, filtered_relation=None):
"""Get path from the related model to this field's model."""
opts = self.model._meta
from_opts = self.remote_field.model._meta
return [PathInfo(
from_opts=from_opts,
to_opts=opts,
target_fields=(opts.pk,),
join_field=self.remote_field,
m2m=not self.unique,
direct=False,
filtered_relation=filtered_relation,
)]
@classmethod
@functools.lru_cache(maxsize=None)
def get_lookups(cls):
bases = inspect.getmro(cls)
bases = bases[:bases.index(ForeignObject) + 1]
class_lookups = [parent.__dict__.get('class_lookups', {}) for parent in bases]
return cls.merge_dicts(class_lookups)
def contribute_to_class(self, cls, name, private_only=False, **kwargs):
super().contribute_to_class(cls, name, private_only=private_only, **kwargs)
setattr(cls, self.name, self.forward_related_accessor_class(self))
def contribute_to_related_class(self, cls, related):
# Internal FK's - i.e., those with a related name ending with '+' -
# and swapped models don't get a related descriptor.
if not self.remote_field.is_hidden() and not related.related_model._meta.swapped:
setattr(cls._meta.concrete_model, related.get_accessor_name(), self.related_accessor_class(related))
# While 'limit_choices_to' might be a callable, simply pass
# it along for later - this is too early because it's still
# model load time.
if self.remote_field.limit_choices_to:
cls._meta.related_fkey_lookups.append(self.remote_field.limit_choices_to)
ForeignObject.register_lookup(RelatedIn)
ForeignObject.register_lookup(RelatedExact)
ForeignObject.register_lookup(RelatedLessThan)
ForeignObject.register_lookup(RelatedGreaterThan)
ForeignObject.register_lookup(RelatedGreaterThanOrEqual)
ForeignObject.register_lookup(RelatedLessThanOrEqual)
ForeignObject.register_lookup(RelatedIsNull)
class ForeignKey(ForeignObject):
"""
Provide a many-to-one relation by adding a column to the local model
to hold the remote value.
By default ForeignKey will target the pk of the remote model but this
behavior can be changed by using the ``to_field`` argument.
"""
descriptor_class = ForeignKeyDeferredAttribute
# Field flags
many_to_many = False
many_to_one = True
one_to_many = False
one_to_one = False
rel_class = ManyToOneRel
empty_strings_allowed = False
default_error_messages = {
'invalid': _('%(model)s instance with %(field)s %(value)r does not exist.')
}
description = _("Foreign Key (type determined by related field)")
def __init__(self, to, on_delete, related_name=None, related_query_name=None,
limit_choices_to=None, parent_link=False, to_field=None,
db_constraint=True, **kwargs):
try:
to._meta.model_name
except AttributeError:
assert isinstance(to, str), (
"%s(%r) is invalid. First parameter to ForeignKey must be "
"either a model, a model name, or the string %r" % (
self.__class__.__name__, to,
RECURSIVE_RELATIONSHIP_CONSTANT,
)
)
else:
# For backwards compatibility purposes, we need to *try* and set
# the to_field during FK construction. It won't be guaranteed to
# be correct until contribute_to_class is called. Refs #12190.
to_field = to_field or (to._meta.pk and to._meta.pk.name)
if not callable(on_delete):
raise TypeError('on_delete must be callable.')
kwargs['rel'] = self.rel_class(
self, to, to_field,
related_name=related_name,
related_query_name=related_query_name,
limit_choices_to=limit_choices_to,
parent_link=parent_link,
on_delete=on_delete,
)
kwargs.setdefault('db_index', True)
super().__init__(
to,
on_delete,
from_fields=[RECURSIVE_RELATIONSHIP_CONSTANT],
to_fields=[to_field],
**kwargs,
)
self.db_constraint = db_constraint
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_on_delete(),
*self._check_unique(),
]
def _check_on_delete(self):
on_delete = getattr(self.remote_field, 'on_delete', None)
if on_delete == SET_NULL and not self.null:
return [
checks.Error(
'Field specifies on_delete=SET_NULL, but cannot be null.',
hint='Set null=True argument on the field, or change the on_delete rule.',
obj=self,
id='fields.E320',
)
]
elif on_delete == SET_DEFAULT and not self.has_default():
return [
checks.Error(
'Field specifies on_delete=SET_DEFAULT, but has no default value.',
hint='Set a default value, or change the on_delete rule.',
obj=self,
id='fields.E321',
)
]
else:
return []
def _check_unique(self, **kwargs):
return [
checks.Warning(
'Setting unique=True on a ForeignKey has the same effect as using a OneToOneField.',
hint='ForeignKey(unique=True) is usually better served by a OneToOneField.',
obj=self,
id='fields.W342',
)
] if self.unique else []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
del kwargs['to_fields']
del kwargs['from_fields']
# Handle the simpler arguments
if self.db_index:
del kwargs['db_index']
else:
kwargs['db_index'] = False
if self.db_constraint is not True:
kwargs['db_constraint'] = self.db_constraint
# Rel needs more work.
to_meta = getattr(self.remote_field.model, "_meta", None)
if self.remote_field.field_name and (
not to_meta or (to_meta.pk and self.remote_field.field_name != to_meta.pk.name)):
kwargs['to_field'] = self.remote_field.field_name
return name, path, args, kwargs
def to_python(self, value):
return self.target_field.to_python(value)
@property
def target_field(self):
return self.foreign_related_fields[0]
def get_reverse_path_info(self, filtered_relation=None):
"""Get path from the related model to this field's model."""
opts = self.model._meta
from_opts = self.remote_field.model._meta
return [PathInfo(
from_opts=from_opts,
to_opts=opts,
target_fields=(opts.pk,),
join_field=self.remote_field,
m2m=not self.unique,
direct=False,
filtered_relation=filtered_relation,
)]
def validate(self, value, model_instance):
if self.remote_field.parent_link:
return
super().validate(value, model_instance)
if value is None:
return
using = router.db_for_read(self.remote_field.model, instance=model_instance)
qs = self.remote_field.model._default_manager.using(using).filter(
**{self.remote_field.field_name: value}
)
qs = qs.complex_filter(self.get_limit_choices_to())
if not qs.exists():
raise exceptions.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={
'model': self.remote_field.model._meta.verbose_name, 'pk': value,
'field': self.remote_field.field_name, 'value': value,
}, # 'pk' is included for backwards compatibility
)
def resolve_related_fields(self):
related_fields = super().resolve_related_fields()
for from_field, to_field in related_fields:
if to_field and to_field.model != self.remote_field.model._meta.concrete_model:
raise exceptions.FieldError(
"'%s.%s' refers to field '%s' which is not local to model "
"'%s'." % (
self.model._meta.label,
self.name,
to_field.name,
self.remote_field.model._meta.concrete_model._meta.label,
)
)
return related_fields
def get_attname(self):
return '%s_id' % self.name
def get_attname_column(self):
attname = self.get_attname()
column = self.db_column or attname
return attname, column
def get_default(self):
"""Return the to_field if the default value is an object."""
field_default = super().get_default()
if isinstance(field_default, self.remote_field.model):
return getattr(field_default, self.target_field.attname)
return field_default
def get_db_prep_save(self, value, connection):
if value is None or (value == '' and
(not self.target_field.empty_strings_allowed or
connection.features.interprets_empty_strings_as_nulls)):
return None
else:
return self.target_field.get_db_prep_save(value, connection=connection)
def get_db_prep_value(self, value, connection, prepared=False):
return self.target_field.get_db_prep_value(value, connection, prepared)
def get_prep_value(self, value):
return self.target_field.get_prep_value(value)
def contribute_to_related_class(self, cls, related):
super().contribute_to_related_class(cls, related)
if self.remote_field.field_name is None:
self.remote_field.field_name = cls._meta.pk.name
def formfield(self, *, using=None, **kwargs):
if isinstance(self.remote_field.model, str):
raise ValueError("Cannot create form field for %r yet, because "
"its related model %r has not been loaded yet" %
(self.name, self.remote_field.model))
return super().formfield(**{
'form_class': forms.ModelChoiceField,
'queryset': self.remote_field.model._default_manager.using(using),
'to_field_name': self.remote_field.field_name,
**kwargs,
})
def db_check(self, connection):
return []
def db_type(self, connection):
return self.target_field.rel_db_type(connection=connection)
def db_parameters(self, connection):
return {"type": self.db_type(connection), "check": self.db_check(connection)}
def convert_empty_strings(self, value, expression, connection):
if (not value) and isinstance(value, str):
return None
return value
def get_db_converters(self, connection):
converters = super().get_db_converters(connection)
if connection.features.interprets_empty_strings_as_nulls:
converters += [self.convert_empty_strings]
return converters
def get_col(self, alias, output_field=None):
if output_field is None:
output_field = self.target_field
while isinstance(output_field, ForeignKey):
output_field = output_field.target_field
if output_field is self:
raise ValueError('Cannot resolve output_field.')
return super().get_col(alias, output_field)
class OneToOneField(ForeignKey):
"""
A OneToOneField is essentially the same as a ForeignKey, with the exception
that it always carries a "unique" constraint with it and the reverse
relation always returns the object pointed to (since there will only ever
be one), rather than returning a list.
"""
# Field flags
many_to_many = False
many_to_one = False
one_to_many = False
one_to_one = True
related_accessor_class = ReverseOneToOneDescriptor
forward_related_accessor_class = ForwardOneToOneDescriptor
rel_class = OneToOneRel
description = _("One-to-one relationship")
def __init__(self, to, on_delete, to_field=None, **kwargs):
kwargs['unique'] = True
super().__init__(to, on_delete, to_field=to_field, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if "unique" in kwargs:
del kwargs['unique']
return name, path, args, kwargs
def formfield(self, **kwargs):
if self.remote_field.parent_link:
return None
return super().formfield(**kwargs)
def save_form_data(self, instance, data):
if isinstance(data, self.remote_field.model):
setattr(instance, self.name, data)
else:
setattr(instance, self.attname, data)
# Remote field object must be cleared otherwise Model.save()
# will reassign attname using the related object pk.
if data is None:
setattr(instance, self.name, data)
def _check_unique(self, **kwargs):
# Override ForeignKey since check isn't applicable here.
return []
def create_many_to_many_intermediary_model(field, klass):
from django.db import models
def set_managed(model, related, through):
through._meta.managed = model._meta.managed or related._meta.managed
to_model = resolve_relation(klass, field.remote_field.model)
name = '%s_%s' % (klass._meta.object_name, field.name)
lazy_related_operation(set_managed, klass, to_model, name)
to = make_model_tuple(to_model)[1]
from_ = klass._meta.model_name
if to == from_:
to = 'to_%s' % to
from_ = 'from_%s' % from_
meta = type('Meta', (), {
'db_table': field._get_m2m_db_table(klass._meta),
'auto_created': klass,
'app_label': klass._meta.app_label,
'db_tablespace': klass._meta.db_tablespace,
'unique_together': (from_, to),
'verbose_name': _('%(from)s-%(to)s relationship') % {'from': from_, 'to': to},
'verbose_name_plural': _('%(from)s-%(to)s relationships') % {'from': from_, 'to': to},
'apps': field.model._meta.apps,
})
# Construct and return the new class.
return type(name, (models.Model,), {
'Meta': meta,
'__module__': klass.__module__,
from_: models.ForeignKey(
klass,
related_name='%s+' % name,
db_tablespace=field.db_tablespace,
db_constraint=field.remote_field.db_constraint,
on_delete=CASCADE,
),
to: models.ForeignKey(
to_model,
related_name='%s+' % name,
db_tablespace=field.db_tablespace,
db_constraint=field.remote_field.db_constraint,
on_delete=CASCADE,
)
})
class ManyToManyField(RelatedField):
"""
Provide a many-to-many relation by using an intermediary model that
holds two ForeignKey fields pointed at the two sides of the relation.
Unless a ``through`` model was provided, ManyToManyField will use the
create_many_to_many_intermediary_model factory to automatically generate
the intermediary model.
"""
# Field flags
many_to_many = True
many_to_one = False
one_to_many = False
one_to_one = False
rel_class = ManyToManyRel
description = _("Many-to-many relationship")
def __init__(self, to, related_name=None, related_query_name=None,
limit_choices_to=None, symmetrical=None, through=None,
through_fields=None, db_constraint=True, db_table=None,
swappable=True, **kwargs):
try:
to._meta
except AttributeError:
assert isinstance(to, str), (
"%s(%r) is invalid. First parameter to ManyToManyField must be "
"either a model, a model name, or the string %r" %
(self.__class__.__name__, to, RECURSIVE_RELATIONSHIP_CONSTANT)
)
if symmetrical is None:
symmetrical = (to == RECURSIVE_RELATIONSHIP_CONSTANT)
if through is not None:
assert db_table is None, (
"Cannot specify a db_table if an intermediary model is used."
)
kwargs['rel'] = self.rel_class(
self, to,
related_name=related_name,
related_query_name=related_query_name,
limit_choices_to=limit_choices_to,
symmetrical=symmetrical,
through=through,
through_fields=through_fields,
db_constraint=db_constraint,
)
self.has_null_arg = 'null' in kwargs
super().__init__(**kwargs)
self.db_table = db_table
self.swappable = swappable
def check(self, **kwargs):
return [
*super().check(**kwargs),
*self._check_unique(**kwargs),
*self._check_relationship_model(**kwargs),
*self._check_ignored_options(**kwargs),
*self._check_table_uniqueness(**kwargs),
]
def _check_unique(self, **kwargs):
if self.unique:
return [
checks.Error(
'ManyToManyFields cannot be unique.',
obj=self,
id='fields.E330',
)
]
return []
def _check_ignored_options(self, **kwargs):
warnings = []
if self.has_null_arg:
warnings.append(
checks.Warning(
'null has no effect on ManyToManyField.',
obj=self,
id='fields.W340',
)
)
if self._validators:
warnings.append(
checks.Warning(
'ManyToManyField does not support validators.',
obj=self,
id='fields.W341',
)
)
if (self.remote_field.limit_choices_to and self.remote_field.through and
not self.remote_field.through._meta.auto_created):
warnings.append(
checks.Warning(
'limit_choices_to has no effect on ManyToManyField '
'with a through model.',
obj=self,
id='fields.W343',
)
)
return warnings
def _check_relationship_model(self, from_model=None, **kwargs):
if hasattr(self.remote_field.through, '_meta'):
qualified_model_name = "%s.%s" % (
self.remote_field.through._meta.app_label, self.remote_field.through.__name__)
else:
qualified_model_name = self.remote_field.through
errors = []
if self.remote_field.through not in self.opts.apps.get_models(include_auto_created=True):
# The relationship model is not installed.
errors.append(
checks.Error(
"Field specifies a many-to-many relation through model "
"'%s', which has not been installed." % qualified_model_name,
obj=self,
id='fields.E331',
)
)
else:
assert from_model is not None, (
"ManyToManyField with intermediate "
"tables cannot be checked if you don't pass the model "
"where the field is attached to."
)
# Set some useful local variables
to_model = resolve_relation(from_model, self.remote_field.model)
from_model_name = from_model._meta.object_name
if isinstance(to_model, str):
to_model_name = to_model
else:
to_model_name = to_model._meta.object_name
relationship_model_name = self.remote_field.through._meta.object_name
self_referential = from_model == to_model
# Count foreign keys in intermediate model
if self_referential:
seen_self = sum(
from_model == getattr(field.remote_field, 'model', None)
for field in self.remote_field.through._meta.fields
)
if seen_self > 2 and not self.remote_field.through_fields:
errors.append(
checks.Error(
"The model is used as an intermediate model by "
"'%s', but it has more than two foreign keys "
"to '%s', which is ambiguous. You must specify "
"which two foreign keys Django should use via the "
"through_fields keyword argument." % (self, from_model_name),
hint="Use through_fields to specify which two foreign keys Django should use.",
obj=self.remote_field.through,
id='fields.E333',
)
)
else:
# Count foreign keys in relationship model
seen_from = sum(
from_model == getattr(field.remote_field, 'model', None)
for field in self.remote_field.through._meta.fields
)
seen_to = sum(
to_model == getattr(field.remote_field, 'model', None)
for field in self.remote_field.through._meta.fields
)
if seen_from > 1 and not self.remote_field.through_fields:
errors.append(
checks.Error(
("The model is used as an intermediate model by "
"'%s', but it has more than one foreign key "
"from '%s', which is ambiguous. You must specify "
"which foreign key Django should use via the "
"through_fields keyword argument.") % (self, from_model_name),
hint=(
'If you want to create a recursive relationship, '
'use ForeignKey("%s", symmetrical=False, through="%s").'
) % (
RECURSIVE_RELATIONSHIP_CONSTANT,
relationship_model_name,
),
obj=self,
id='fields.E334',
)
)
if seen_to > 1 and not self.remote_field.through_fields:
errors.append(
checks.Error(
"The model is used as an intermediate model by "
"'%s', but it has more than one foreign key "
"to '%s', which is ambiguous. You must specify "
"which foreign key Django should use via the "
"through_fields keyword argument." % (self, to_model_name),
hint=(
'If you want to create a recursive relationship, '
'use ForeignKey("%s", symmetrical=False, through="%s").'
) % (
RECURSIVE_RELATIONSHIP_CONSTANT,
relationship_model_name,
),
obj=self,
id='fields.E335',
)
)
if seen_from == 0 or seen_to == 0:
errors.append(
checks.Error(
"The model is used as an intermediate model by "
"'%s', but it does not have a foreign key to '%s' or '%s'." % (
self, from_model_name, to_model_name
),
obj=self.remote_field.through,
id='fields.E336',
)
)
# Validate `through_fields`.
if self.remote_field.through_fields is not None:
# Validate that we're given an iterable of at least two items
# and that none of them is "falsy".
if not (len(self.remote_field.through_fields) >= 2 and
self.remote_field.through_fields[0] and self.remote_field.through_fields[1]):
errors.append(
checks.Error(
"Field specifies 'through_fields' but does not provide "
"the names of the two link fields that should be used "
"for the relation through model '%s'." % qualified_model_name,
hint="Make sure you specify 'through_fields' as through_fields=('field1', 'field2')",
obj=self,
id='fields.E337',
)
)
# Validate the given through fields -- they should be actual
# fields on the through model, and also be foreign keys to the
# expected models.
else:
assert from_model is not None, (
"ManyToManyField with intermediate "
"tables cannot be checked if you don't pass the model "
"where the field is attached to."
)
source, through, target = from_model, self.remote_field.through, self.remote_field.model
source_field_name, target_field_name = self.remote_field.through_fields[:2]
for field_name, related_model in ((source_field_name, source),
(target_field_name, target)):
possible_field_names = []
for f in through._meta.fields:
if hasattr(f, 'remote_field') and getattr(f.remote_field, 'model', None) == related_model:
possible_field_names.append(f.name)
if possible_field_names:
hint = "Did you mean one of the following foreign keys to '%s': %s?" % (
related_model._meta.object_name,
', '.join(possible_field_names),
)
else:
hint = None
try:
field = through._meta.get_field(field_name)
except exceptions.FieldDoesNotExist:
errors.append(
checks.Error(
"The intermediary model '%s' has no field '%s'."
% (qualified_model_name, field_name),
hint=hint,
obj=self,
id='fields.E338',
)
)
else:
if not (hasattr(field, 'remote_field') and
getattr(field.remote_field, 'model', None) == related_model):
errors.append(
checks.Error(
"'%s.%s' is not a foreign key to '%s'." % (
through._meta.object_name, field_name,
related_model._meta.object_name,
),
hint=hint,
obj=self,
id='fields.E339',
)
)
return errors
def _check_table_uniqueness(self, **kwargs):
if isinstance(self.remote_field.through, str) or not self.remote_field.through._meta.managed:
return []
registered_tables = {
model._meta.db_table: model
for model in self.opts.apps.get_models(include_auto_created=True)
if model != self.remote_field.through and model._meta.managed
}
m2m_db_table = self.m2m_db_table()
model = registered_tables.get(m2m_db_table)
# The second condition allows multiple m2m relations on a model if
# some point to a through model that proxies another through model.
if model and model._meta.concrete_model != self.remote_field.through._meta.concrete_model:
if model._meta.auto_created:
def _get_field_name(model):
for field in model._meta.auto_created._meta.many_to_many:
if field.remote_field.through is model:
return field.name
opts = model._meta.auto_created._meta
clashing_obj = '%s.%s' % (opts.label, _get_field_name(model))
else:
clashing_obj = model._meta.label
return [
checks.Error(
"The field's intermediary table '%s' clashes with the "
"table name of '%s'." % (m2m_db_table, clashing_obj),
obj=self,
id='fields.E340',
)
]
return []
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
# Handle the simpler arguments.
if self.db_table is not None:
kwargs['db_table'] = self.db_table
if self.remote_field.db_constraint is not True:
kwargs['db_constraint'] = self.remote_field.db_constraint
# Rel needs more work.
if isinstance(self.remote_field.model, str):
kwargs['to'] = self.remote_field.model
else:
kwargs['to'] = "%s.%s" % (
self.remote_field.model._meta.app_label,
self.remote_field.model._meta.object_name,
)
if getattr(self.remote_field, 'through', None) is not None:
if isinstance(self.remote_field.through, str):
kwargs['through'] = self.remote_field.through
elif not self.remote_field.through._meta.auto_created:
kwargs['through'] = "%s.%s" % (
self.remote_field.through._meta.app_label,
self.remote_field.through._meta.object_name,
)
# If swappable is True, then see if we're actually pointing to the target
# of a swap.
swappable_setting = self.swappable_setting
if swappable_setting is not None:
# If it's already a settings reference, error.
if hasattr(kwargs['to'], "setting_name"):
if kwargs['to'].setting_name != swappable_setting:
raise ValueError(
"Cannot deconstruct a ManyToManyField pointing to a "
"model that is swapped in place of more than one model "
"(%s and %s)" % (kwargs['to'].setting_name, swappable_setting)
)
kwargs['to'] = SettingsReference(
kwargs['to'],
swappable_setting,
)
return name, path, args, kwargs
def _get_path_info(self, direct=False, filtered_relation=None):
"""Called by both direct and indirect m2m traversal."""
int_model = self.remote_field.through
linkfield1 = int_model._meta.get_field(self.m2m_field_name())
linkfield2 = int_model._meta.get_field(self.m2m_reverse_field_name())
if direct:
join1infos = linkfield1.get_reverse_path_info()
join2infos = linkfield2.get_path_info(filtered_relation)
else:
join1infos = linkfield2.get_reverse_path_info()
join2infos = linkfield1.get_path_info(filtered_relation)
# Get join infos between the last model of join 1 and the first model
# of join 2. Assume the only reason these may differ is due to model
# inheritance.
join1_final = join1infos[-1].to_opts
join2_initial = join2infos[0].from_opts
if join1_final is join2_initial:
intermediate_infos = []
elif issubclass(join1_final.model, join2_initial.model):
intermediate_infos = join1_final.get_path_to_parent(join2_initial.model)
else:
intermediate_infos = join2_initial.get_path_from_parent(join1_final.model)
return [*join1infos, *intermediate_infos, *join2infos]
def get_path_info(self, filtered_relation=None):
return self._get_path_info(direct=True, filtered_relation=filtered_relation)
def get_reverse_path_info(self, filtered_relation=None):
return self._get_path_info(direct=False, filtered_relation=filtered_relation)
def _get_m2m_db_table(self, opts):
"""
Function that can be curried to provide the m2m table name for this
relation.
"""
if self.remote_field.through is not None:
return self.remote_field.through._meta.db_table
elif self.db_table:
return self.db_table
else:
m2m_table_name = '%s_%s' % (utils.strip_quotes(opts.db_table), self.name)
return utils.truncate_name(m2m_table_name, connection.ops.max_name_length())
def _get_m2m_attr(self, related, attr):
"""
Function that can be curried to provide the source accessor or DB
column name for the m2m table.
"""
cache_attr = '_m2m_%s_cache' % attr
if hasattr(self, cache_attr):
return getattr(self, cache_attr)
if self.remote_field.through_fields is not None:
link_field_name = self.remote_field.through_fields[0]
else:
link_field_name = None
for f in self.remote_field.through._meta.fields:
if (f.is_relation and f.remote_field.model == related.related_model and
(link_field_name is None or link_field_name == f.name)):
setattr(self, cache_attr, getattr(f, attr))
return getattr(self, cache_attr)
def _get_m2m_reverse_attr(self, related, attr):
"""
Function that can be curried to provide the related accessor or DB
column name for the m2m table.
"""
cache_attr = '_m2m_reverse_%s_cache' % attr
if hasattr(self, cache_attr):
return getattr(self, cache_attr)
found = False
if self.remote_field.through_fields is not None:
link_field_name = self.remote_field.through_fields[1]
else:
link_field_name = None
for f in self.remote_field.through._meta.fields:
if f.is_relation and f.remote_field.model == related.model:
if link_field_name is None and related.related_model == related.model:
# If this is an m2m-intermediate to self,
# the first foreign key you find will be
# the source column. Keep searching for
# the second foreign key.
if found:
setattr(self, cache_attr, getattr(f, attr))
break
else:
found = True
elif link_field_name is None or link_field_name == f.name:
setattr(self, cache_attr, getattr(f, attr))
break
return getattr(self, cache_attr)
def contribute_to_class(self, cls, name, **kwargs):
# To support multiple relations to self, it's useful to have a non-None
# related name on symmetrical relations for internal reasons. The
# concept doesn't make a lot of sense externally ("you want me to
# specify *what* on my non-reversible relation?!"), so we set it up
# automatically. The funky name reduces the chance of an accidental
# clash.
if self.remote_field.symmetrical and (
self.remote_field.model == RECURSIVE_RELATIONSHIP_CONSTANT or
self.remote_field.model == cls._meta.object_name
):
self.remote_field.related_name = "%s_rel_+" % name
elif self.remote_field.is_hidden():
# If the backwards relation is disabled, replace the original
# related_name with one generated from the m2m field name. Django
# still uses backwards relations internally and we need to avoid
# clashes between multiple m2m fields with related_name == '+'.
self.remote_field.related_name = "_%s_%s_+" % (cls.__name__.lower(), name)
super().contribute_to_class(cls, name, **kwargs)
# The intermediate m2m model is not auto created if:
# 1) There is a manually specified intermediate, or
# 2) The class owning the m2m field is abstract.
# 3) The class owning the m2m field has been swapped out.
if not cls._meta.abstract:
if self.remote_field.through:
def resolve_through_model(_, model, field):
field.remote_field.through = model
lazy_related_operation(resolve_through_model, cls, self.remote_field.through, field=self)
elif not cls._meta.swapped:
self.remote_field.through = create_many_to_many_intermediary_model(self, cls)
# Add the descriptor for the m2m relation.
setattr(cls, self.name, ManyToManyDescriptor(self.remote_field, reverse=False))
# Set up the accessor for the m2m table name for the relation.
self.m2m_db_table = partial(self._get_m2m_db_table, cls._meta)
def contribute_to_related_class(self, cls, related):
# Internal M2Ms (i.e., those with a related name ending with '+')
# and swapped models don't get a related descriptor.
if not self.remote_field.is_hidden() and not related.related_model._meta.swapped:
setattr(cls, related.get_accessor_name(), ManyToManyDescriptor(self.remote_field, reverse=True))
# Set up the accessors for the column names on the m2m table.
self.m2m_column_name = partial(self._get_m2m_attr, related, 'column')
self.m2m_reverse_name = partial(self._get_m2m_reverse_attr, related, 'column')
self.m2m_field_name = partial(self._get_m2m_attr, related, 'name')
self.m2m_reverse_field_name = partial(self._get_m2m_reverse_attr, related, 'name')
get_m2m_rel = partial(self._get_m2m_attr, related, 'remote_field')
self.m2m_target_field_name = lambda: get_m2m_rel().field_name
get_m2m_reverse_rel = partial(self._get_m2m_reverse_attr, related, 'remote_field')
self.m2m_reverse_target_field_name = lambda: get_m2m_reverse_rel().field_name
def set_attributes_from_rel(self):
pass
def value_from_object(self, obj):
return [] if obj.pk is None else list(getattr(obj, self.attname).all())
def save_form_data(self, instance, data):
getattr(instance, self.attname).set(data)
def formfield(self, *, using=None, **kwargs):
defaults = {
'form_class': forms.ModelMultipleChoiceField,
'queryset': self.remote_field.model._default_manager.using(using),
**kwargs,
}
# If initial is passed in, it's a list of related objects, but the
# MultipleChoiceField takes a list of IDs.
if defaults.get('initial') is not None:
initial = defaults['initial']
if callable(initial):
initial = initial()
defaults['initial'] = [i.pk for i in initial]
return super().formfield(**defaults)
def db_check(self, connection):
return None
def db_type(self, connection):
# A ManyToManyField is not represented by a single column,
# so return None.
return None
def db_parameters(self, connection):
return {"type": None, "check": None}
|
e43ee318b13674af9402d69cf5a57a6b30605831f9959f95ad888ff5f949d379 | import collections
import re
from functools import partial
from itertools import chain
from django.core.exceptions import EmptyResultSet, FieldError
from django.db import DatabaseError, NotSupportedError
from django.db.models.constants import LOOKUP_SEP
from django.db.models.expressions import OrderBy, Random, RawSQL, Ref, Value
from django.db.models.functions import Cast
from django.db.models.query_utils import Q, select_related_descend
from django.db.models.sql.constants import (
CURSOR, GET_ITERATOR_CHUNK_SIZE, MULTI, NO_RESULTS, ORDER_DIR, SINGLE,
)
from django.db.models.sql.query import Query, get_order_dir
from django.db.transaction import TransactionManagementError
from django.utils.functional import cached_property
from django.utils.hashable import make_hashable
class SQLCompiler:
def __init__(self, query, connection, using):
self.query = query
self.connection = connection
self.using = using
self.quote_cache = {'*': '*'}
# The select, klass_info, and annotations are needed by QuerySet.iterator()
# these are set as a side-effect of executing the query. Note that we calculate
# separately a list of extra select columns needed for grammatical correctness
# of the query, but these columns are not included in self.select.
self.select = None
self.annotation_col_map = None
self.klass_info = None
# Multiline ordering SQL clause may appear from RawSQL.
self.ordering_parts = re.compile(r'^(.*)\s(ASC|DESC)(.*)', re.MULTILINE | re.DOTALL)
self._meta_ordering = None
def setup_query(self):
if all(self.query.alias_refcount[a] == 0 for a in self.query.alias_map):
self.query.get_initial_alias()
self.select, self.klass_info, self.annotation_col_map = self.get_select()
self.col_count = len(self.select)
def pre_sql_setup(self):
"""
Do any necessary class setup immediately prior to producing SQL. This
is for things that can't necessarily be done in __init__ because we
might not have all the pieces in place at that time.
"""
self.setup_query()
order_by = self.get_order_by()
self.where, self.having = self.query.where.split_having()
extra_select = self.get_extra_select(order_by, self.select)
self.has_extra_select = bool(extra_select)
group_by = self.get_group_by(self.select + extra_select, order_by)
return extra_select, order_by, group_by
def get_group_by(self, select, order_by):
"""
Return a list of 2-tuples of form (sql, params).
The logic of what exactly the GROUP BY clause contains is hard
to describe in other words than "if it passes the test suite,
then it is correct".
"""
# Some examples:
# SomeModel.objects.annotate(Count('somecol'))
# GROUP BY: all fields of the model
#
# SomeModel.objects.values('name').annotate(Count('somecol'))
# GROUP BY: name
#
# SomeModel.objects.annotate(Count('somecol')).values('name')
# GROUP BY: all cols of the model
#
# SomeModel.objects.values('name', 'pk').annotate(Count('somecol')).values('pk')
# GROUP BY: name, pk
#
# SomeModel.objects.values('name').annotate(Count('somecol')).values('pk')
# GROUP BY: name, pk
#
# In fact, the self.query.group_by is the minimal set to GROUP BY. It
# can't be ever restricted to a smaller set, but additional columns in
# HAVING, ORDER BY, and SELECT clauses are added to it. Unfortunately
# the end result is that it is impossible to force the query to have
# a chosen GROUP BY clause - you can almost do this by using the form:
# .values(*wanted_cols).annotate(AnAggregate())
# but any later annotations, extra selects, values calls that
# refer some column outside of the wanted_cols, order_by, or even
# filter calls can alter the GROUP BY clause.
# The query.group_by is either None (no GROUP BY at all), True
# (group by select fields), or a list of expressions to be added
# to the group by.
if self.query.group_by is None:
return []
expressions = []
if self.query.group_by is not True:
# If the group by is set to a list (by .values() call most likely),
# then we need to add everything in it to the GROUP BY clause.
# Backwards compatibility hack for setting query.group_by. Remove
# when we have public API way of forcing the GROUP BY clause.
# Converts string references to expressions.
for expr in self.query.group_by:
if not hasattr(expr, 'as_sql'):
expressions.append(self.query.resolve_ref(expr))
else:
expressions.append(expr)
# Note that even if the group_by is set, it is only the minimal
# set to group by. So, we need to add cols in select, order_by, and
# having into the select in any case.
ref_sources = {
expr.source for expr in expressions if isinstance(expr, Ref)
}
for expr, _, _ in select:
# Skip members of the select clause that are already included
# by reference.
if expr in ref_sources:
continue
cols = expr.get_group_by_cols()
for col in cols:
expressions.append(col)
for expr, (sql, params, is_ref) in order_by:
# Skip References to the select clause, as all expressions in the
# select clause are already part of the group by.
if not is_ref:
expressions.extend(expr.get_group_by_cols())
having_group_by = self.having.get_group_by_cols() if self.having else ()
for expr in having_group_by:
expressions.append(expr)
result = []
seen = set()
expressions = self.collapse_group_by(expressions, having_group_by)
for expr in expressions:
sql, params = self.compile(expr)
params_hash = make_hashable(params)
if (sql, params_hash) not in seen:
result.append((sql, params))
seen.add((sql, params_hash))
return result
def collapse_group_by(self, expressions, having):
# If the DB can group by primary key, then group by the primary key of
# query's main model. Note that for PostgreSQL the GROUP BY clause must
# include the primary key of every table, but for MySQL it is enough to
# have the main table's primary key.
if self.connection.features.allows_group_by_pk:
# Determine if the main model's primary key is in the query.
pk = None
for expr in expressions:
# Is this a reference to query's base table primary key? If the
# expression isn't a Col-like, then skip the expression.
if (getattr(expr, 'target', None) == self.query.model._meta.pk and
getattr(expr, 'alias', None) == self.query.base_table):
pk = expr
break
# If the main model's primary key is in the query, group by that
# field, HAVING expressions, and expressions associated with tables
# that don't have a primary key included in the grouped columns.
if pk:
pk_aliases = {
expr.alias for expr in expressions
if hasattr(expr, 'target') and expr.target.primary_key
}
expressions = [pk] + [
expr for expr in expressions
if expr in having or (
getattr(expr, 'alias', None) is not None and expr.alias not in pk_aliases
)
]
elif self.connection.features.allows_group_by_selected_pks:
# Filter out all expressions associated with a table's primary key
# present in the grouped columns. This is done by identifying all
# tables that have their primary key included in the grouped
# columns and removing non-primary key columns referring to them.
# Unmanaged models are excluded because they could be representing
# database views on which the optimization might not be allowed.
pks = {
expr for expr in expressions
if (
hasattr(expr, 'target') and
expr.target.primary_key and
self.connection.features.allows_group_by_selected_pks_on_model(expr.target.model)
)
}
aliases = {expr.alias for expr in pks}
expressions = [
expr for expr in expressions if expr in pks or getattr(expr, 'alias', None) not in aliases
]
return expressions
def get_select(self):
"""
Return three values:
- a list of 3-tuples of (expression, (sql, params), alias)
- a klass_info structure,
- a dictionary of annotations
The (sql, params) is what the expression will produce, and alias is the
"AS alias" for the column (possibly None).
The klass_info structure contains the following information:
- The base model of the query.
- Which columns for that model are present in the query (by
position of the select clause).
- related_klass_infos: [f, klass_info] to descent into
The annotations is a dictionary of {'attname': column position} values.
"""
select = []
klass_info = None
annotations = {}
select_idx = 0
for alias, (sql, params) in self.query.extra_select.items():
annotations[alias] = select_idx
select.append((RawSQL(sql, params), alias))
select_idx += 1
assert not (self.query.select and self.query.default_cols)
if self.query.default_cols:
cols = self.get_default_columns()
else:
# self.query.select is a special case. These columns never go to
# any model.
cols = self.query.select
if cols:
select_list = []
for col in cols:
select_list.append(select_idx)
select.append((col, None))
select_idx += 1
klass_info = {
'model': self.query.model,
'select_fields': select_list,
}
for alias, annotation in self.query.annotation_select.items():
annotations[alias] = select_idx
select.append((annotation, alias))
select_idx += 1
if self.query.select_related:
related_klass_infos = self.get_related_selections(select)
klass_info['related_klass_infos'] = related_klass_infos
def get_select_from_parent(klass_info):
for ki in klass_info['related_klass_infos']:
if ki['from_parent']:
ki['select_fields'] = (klass_info['select_fields'] +
ki['select_fields'])
get_select_from_parent(ki)
get_select_from_parent(klass_info)
ret = []
for col, alias in select:
try:
sql, params = self.compile(col)
except EmptyResultSet:
# Select a predicate that's always False.
sql, params = '0', ()
else:
sql, params = col.select_format(self, sql, params)
ret.append((col, (sql, params), alias))
return ret, klass_info, annotations
def get_order_by(self):
"""
Return a list of 2-tuples of form (expr, (sql, params, is_ref)) for the
ORDER BY clause.
The order_by clause can alter the select clause (for example it
can add aliases to clauses that do not yet have one, or it can
add totally new select clauses).
"""
if self.query.extra_order_by:
ordering = self.query.extra_order_by
elif not self.query.default_ordering:
ordering = self.query.order_by
elif self.query.order_by:
ordering = self.query.order_by
elif self.query.get_meta().ordering:
ordering = self.query.get_meta().ordering
self._meta_ordering = ordering
else:
ordering = []
if self.query.standard_ordering:
asc, desc = ORDER_DIR['ASC']
else:
asc, desc = ORDER_DIR['DESC']
order_by = []
for field in ordering:
if hasattr(field, 'resolve_expression'):
if isinstance(field, Value):
# output_field must be resolved for constants.
field = Cast(field, field.output_field)
if not isinstance(field, OrderBy):
field = field.asc()
if not self.query.standard_ordering:
field = field.copy()
field.reverse_ordering()
order_by.append((field, False))
continue
if field == '?': # random
order_by.append((OrderBy(Random()), False))
continue
col, order = get_order_dir(field, asc)
descending = order == 'DESC'
if col in self.query.annotation_select:
# Reference to expression in SELECT clause
order_by.append((
OrderBy(Ref(col, self.query.annotation_select[col]), descending=descending),
True))
continue
if col in self.query.annotations:
# References to an expression which is masked out of the SELECT
# clause.
expr = self.query.annotations[col]
if isinstance(expr, Value):
# output_field must be resolved for constants.
expr = Cast(expr, expr.output_field)
order_by.append((OrderBy(expr, descending=descending), False))
continue
if '.' in field:
# This came in through an extra(order_by=...) addition. Pass it
# on verbatim.
table, col = col.split('.', 1)
order_by.append((
OrderBy(
RawSQL('%s.%s' % (self.quote_name_unless_alias(table), col), []),
descending=descending
), False))
continue
if not self.query.extra or col not in self.query.extra:
# 'col' is of the form 'field' or 'field1__field2' or
# '-field1__field2__field', etc.
order_by.extend(self.find_ordering_name(
field, self.query.get_meta(), default_order=asc))
else:
if col not in self.query.extra_select:
order_by.append((
OrderBy(RawSQL(*self.query.extra[col]), descending=descending),
False))
else:
order_by.append((
OrderBy(Ref(col, RawSQL(*self.query.extra[col])), descending=descending),
True))
result = []
seen = set()
for expr, is_ref in order_by:
resolved = expr.resolve_expression(self.query, allow_joins=True, reuse=None)
if self.query.combinator:
src = resolved.get_source_expressions()[0]
# Relabel order by columns to raw numbers if this is a combined
# query; necessary since the columns can't be referenced by the
# fully qualified name and the simple column names may collide.
for idx, (sel_expr, _, col_alias) in enumerate(self.select):
if is_ref and col_alias == src.refs:
src = src.source
elif col_alias:
continue
if src == sel_expr:
resolved.set_source_expressions([RawSQL('%d' % (idx + 1), ())])
break
else:
if col_alias:
raise DatabaseError('ORDER BY term does not match any column in the result set.')
# Add column used in ORDER BY clause without an alias to
# the selected columns.
self.query.add_select_col(src)
resolved.set_source_expressions([RawSQL('%d' % len(self.query.select), ())])
sql, params = self.compile(resolved)
# Don't add the same column twice, but the order direction is
# not taken into account so we strip it. When this entire method
# is refactored into expressions, then we can check each part as we
# generate it.
without_ordering = self.ordering_parts.search(sql).group(1)
params_hash = make_hashable(params)
if (without_ordering, params_hash) in seen:
continue
seen.add((without_ordering, params_hash))
result.append((resolved, (sql, params, is_ref)))
return result
def get_extra_select(self, order_by, select):
extra_select = []
if self.query.distinct and not self.query.distinct_fields:
select_sql = [t[1] for t in select]
for expr, (sql, params, is_ref) in order_by:
without_ordering = self.ordering_parts.search(sql).group(1)
if not is_ref and (without_ordering, params) not in select_sql:
extra_select.append((expr, (without_ordering, params), None))
return extra_select
def quote_name_unless_alias(self, name):
"""
A wrapper around connection.ops.quote_name that doesn't quote aliases
for table names. This avoids problems with some SQL dialects that treat
quoted strings specially (e.g. PostgreSQL).
"""
if name in self.quote_cache:
return self.quote_cache[name]
if ((name in self.query.alias_map and name not in self.query.table_map) or
name in self.query.extra_select or (
self.query.external_aliases.get(name) and name not in self.query.table_map)):
self.quote_cache[name] = name
return name
r = self.connection.ops.quote_name(name)
self.quote_cache[name] = r
return r
def compile(self, node):
vendor_impl = getattr(node, 'as_' + self.connection.vendor, None)
if vendor_impl:
sql, params = vendor_impl(self, self.connection)
else:
sql, params = node.as_sql(self, self.connection)
return sql, params
def get_combinator_sql(self, combinator, all):
features = self.connection.features
compilers = [
query.get_compiler(self.using, self.connection)
for query in self.query.combined_queries if not query.is_empty()
]
if not features.supports_slicing_ordering_in_compound:
for query, compiler in zip(self.query.combined_queries, compilers):
if query.low_mark or query.high_mark:
raise DatabaseError('LIMIT/OFFSET not allowed in subqueries of compound statements.')
if compiler.get_order_by():
raise DatabaseError('ORDER BY not allowed in subqueries of compound statements.')
parts = ()
for compiler in compilers:
try:
# If the columns list is limited, then all combined queries
# must have the same columns list. Set the selects defined on
# the query on all combined queries, if not already set.
if not compiler.query.values_select and self.query.values_select:
compiler.query = compiler.query.clone()
compiler.query.set_values((
*self.query.extra_select,
*self.query.values_select,
*self.query.annotation_select,
))
part_sql, part_args = compiler.as_sql()
if compiler.query.combinator:
# Wrap in a subquery if wrapping in parentheses isn't
# supported.
if not features.supports_parentheses_in_compound:
part_sql = 'SELECT * FROM ({})'.format(part_sql)
# Add parentheses when combining with compound query if not
# already added for all compound queries.
elif not features.supports_slicing_ordering_in_compound:
part_sql = '({})'.format(part_sql)
parts += ((part_sql, part_args),)
except EmptyResultSet:
# Omit the empty queryset with UNION and with DIFFERENCE if the
# first queryset is nonempty.
if combinator == 'union' or (combinator == 'difference' and parts):
continue
raise
if not parts:
raise EmptyResultSet
combinator_sql = self.connection.ops.set_operators[combinator]
if all and combinator == 'union':
combinator_sql += ' ALL'
braces = '({})' if features.supports_slicing_ordering_in_compound else '{}'
sql_parts, args_parts = zip(*((braces.format(sql), args) for sql, args in parts))
result = [' {} '.format(combinator_sql).join(sql_parts)]
params = []
for part in args_parts:
params.extend(part)
return result, params
def as_sql(self, with_limits=True, with_col_aliases=False):
"""
Create the SQL for this query. Return the SQL string and list of
parameters.
If 'with_limits' is False, any limit/offset information is not included
in the query.
"""
refcounts_before = self.query.alias_refcount.copy()
try:
extra_select, order_by, group_by = self.pre_sql_setup()
for_update_part = None
# Is a LIMIT/OFFSET clause needed?
with_limit_offset = with_limits and (self.query.high_mark is not None or self.query.low_mark)
combinator = self.query.combinator
features = self.connection.features
if combinator:
if not getattr(features, 'supports_select_{}'.format(combinator)):
raise NotSupportedError('{} is not supported on this database backend.'.format(combinator))
result, params = self.get_combinator_sql(combinator, self.query.combinator_all)
else:
distinct_fields, distinct_params = self.get_distinct()
# This must come after 'select', 'ordering', and 'distinct'
# (see docstring of get_from_clause() for details).
from_, f_params = self.get_from_clause()
where, w_params = self.compile(self.where) if self.where is not None else ("", [])
having, h_params = self.compile(self.having) if self.having is not None else ("", [])
result = ['SELECT']
params = []
if self.query.distinct:
distinct_result, distinct_params = self.connection.ops.distinct_sql(
distinct_fields,
distinct_params,
)
result += distinct_result
params += distinct_params
out_cols = []
col_idx = 1
for _, (s_sql, s_params), alias in self.select + extra_select:
if alias:
s_sql = '%s AS %s' % (s_sql, self.connection.ops.quote_name(alias))
elif with_col_aliases:
s_sql = '%s AS %s' % (s_sql, 'Col%d' % col_idx)
col_idx += 1
params.extend(s_params)
out_cols.append(s_sql)
result += [', '.join(out_cols), 'FROM', *from_]
params.extend(f_params)
if self.query.select_for_update and self.connection.features.has_select_for_update:
if self.connection.get_autocommit():
raise TransactionManagementError('select_for_update cannot be used outside of a transaction.')
if with_limit_offset and not self.connection.features.supports_select_for_update_with_limit:
raise NotSupportedError(
'LIMIT/OFFSET is not supported with '
'select_for_update on this database backend.'
)
nowait = self.query.select_for_update_nowait
skip_locked = self.query.select_for_update_skip_locked
of = self.query.select_for_update_of
# If it's a NOWAIT/SKIP LOCKED/OF query but the backend
# doesn't support it, raise NotSupportedError to prevent a
# possible deadlock.
if nowait and not self.connection.features.has_select_for_update_nowait:
raise NotSupportedError('NOWAIT is not supported on this database backend.')
elif skip_locked and not self.connection.features.has_select_for_update_skip_locked:
raise NotSupportedError('SKIP LOCKED is not supported on this database backend.')
elif of and not self.connection.features.has_select_for_update_of:
raise NotSupportedError('FOR UPDATE OF is not supported on this database backend.')
for_update_part = self.connection.ops.for_update_sql(
nowait=nowait,
skip_locked=skip_locked,
of=self.get_select_for_update_of_arguments(),
)
if for_update_part and self.connection.features.for_update_after_from:
result.append(for_update_part)
if where:
result.append('WHERE %s' % where)
params.extend(w_params)
grouping = []
for g_sql, g_params in group_by:
grouping.append(g_sql)
params.extend(g_params)
if grouping:
if distinct_fields:
raise NotImplementedError('annotate() + distinct(fields) is not implemented.')
order_by = order_by or self.connection.ops.force_no_ordering()
result.append('GROUP BY %s' % ', '.join(grouping))
if self._meta_ordering:
order_by = None
if having:
result.append('HAVING %s' % having)
params.extend(h_params)
if self.query.explain_query:
result.insert(0, self.connection.ops.explain_query_prefix(
self.query.explain_format,
**self.query.explain_options
))
if order_by:
ordering = []
for _, (o_sql, o_params, _) in order_by:
ordering.append(o_sql)
params.extend(o_params)
result.append('ORDER BY %s' % ', '.join(ordering))
if with_limit_offset:
result.append(self.connection.ops.limit_offset_sql(self.query.low_mark, self.query.high_mark))
if for_update_part and not self.connection.features.for_update_after_from:
result.append(for_update_part)
if self.query.subquery and extra_select:
# If the query is used as a subquery, the extra selects would
# result in more columns than the left-hand side expression is
# expecting. This can happen when a subquery uses a combination
# of order_by() and distinct(), forcing the ordering expressions
# to be selected as well. Wrap the query in another subquery
# to exclude extraneous selects.
sub_selects = []
sub_params = []
for index, (select, _, alias) in enumerate(self.select, start=1):
if not alias and with_col_aliases:
alias = 'col%d' % index
if alias:
sub_selects.append("%s.%s" % (
self.connection.ops.quote_name('subquery'),
self.connection.ops.quote_name(alias),
))
else:
select_clone = select.relabeled_clone({select.alias: 'subquery'})
subselect, subparams = select_clone.as_sql(self, self.connection)
sub_selects.append(subselect)
sub_params.extend(subparams)
return 'SELECT %s FROM (%s) subquery' % (
', '.join(sub_selects),
' '.join(result),
), tuple(sub_params + params)
return ' '.join(result), tuple(params)
finally:
# Finally do cleanup - get rid of the joins we created above.
self.query.reset_refcounts(refcounts_before)
def get_default_columns(self, start_alias=None, opts=None, from_parent=None):
"""
Compute the default columns for selecting every field in the base
model. Will sometimes be called to pull in related models (e.g. via
select_related), in which case "opts" and "start_alias" will be given
to provide a starting point for the traversal.
Return a list of strings, quoted appropriately for use in SQL
directly, as well as a set of aliases used in the select statement (if
'as_pairs' is True, return a list of (alias, col_name) pairs instead
of strings as the first component and None as the second component).
"""
result = []
if opts is None:
opts = self.query.get_meta()
only_load = self.deferred_to_columns()
start_alias = start_alias or self.query.get_initial_alias()
# The 'seen_models' is used to optimize checking the needed parent
# alias for a given field. This also includes None -> start_alias to
# be used by local fields.
seen_models = {None: start_alias}
for field in opts.concrete_fields:
model = field.model._meta.concrete_model
# A proxy model will have a different model and concrete_model. We
# will assign None if the field belongs to this model.
if model == opts.model:
model = None
if from_parent and model is not None and issubclass(
from_parent._meta.concrete_model, model._meta.concrete_model):
# Avoid loading data for already loaded parents.
# We end up here in the case select_related() resolution
# proceeds from parent model to child model. In that case the
# parent model data is already present in the SELECT clause,
# and we want to avoid reloading the same data again.
continue
if field.model in only_load and field.attname not in only_load[field.model]:
continue
alias = self.query.join_parent_model(opts, model, start_alias,
seen_models)
column = field.get_col(alias)
result.append(column)
return result
def get_distinct(self):
"""
Return a quoted list of fields to use in DISTINCT ON part of the query.
This method can alter the tables in the query, and thus it must be
called before get_from_clause().
"""
result = []
params = []
opts = self.query.get_meta()
for name in self.query.distinct_fields:
parts = name.split(LOOKUP_SEP)
_, targets, alias, joins, path, _, transform_function = self._setup_joins(parts, opts, None)
targets, alias, _ = self.query.trim_joins(targets, joins, path)
for target in targets:
if name in self.query.annotation_select:
result.append(name)
else:
r, p = self.compile(transform_function(target, alias))
result.append(r)
params.append(p)
return result, params
def find_ordering_name(self, name, opts, alias=None, default_order='ASC',
already_seen=None):
"""
Return the table alias (the name might be ambiguous, the alias will
not be) and column name for ordering by the given 'name' parameter.
The 'name' is of the form 'field1__field2__...__fieldN'.
"""
name, order = get_order_dir(name, default_order)
descending = order == 'DESC'
pieces = name.split(LOOKUP_SEP)
field, targets, alias, joins, path, opts, transform_function = self._setup_joins(pieces, opts, alias)
# If we get to this point and the field is a relation to another model,
# append the default ordering for that model unless the attribute name
# of the field is specified.
if field.is_relation and opts.ordering and getattr(field, 'attname', None) != name:
# Firstly, avoid infinite loops.
already_seen = already_seen or set()
join_tuple = tuple(getattr(self.query.alias_map[j], 'join_cols', None) for j in joins)
if join_tuple in already_seen:
raise FieldError('Infinite loop caused by ordering.')
already_seen.add(join_tuple)
results = []
for item in opts.ordering:
if hasattr(item, 'resolve_expression') and not isinstance(item, OrderBy):
item = item.desc() if descending else item.asc()
if isinstance(item, OrderBy):
results.append((item, False))
continue
results.extend(self.find_ordering_name(item, opts, alias,
order, already_seen))
return results
targets, alias, _ = self.query.trim_joins(targets, joins, path)
return [(OrderBy(transform_function(t, alias), descending=descending), False) for t in targets]
def _setup_joins(self, pieces, opts, alias):
"""
Helper method for get_order_by() and get_distinct().
get_ordering() and get_distinct() must produce same target columns on
same input, as the prefixes of get_ordering() and get_distinct() must
match. Executing SQL where this is not true is an error.
"""
alias = alias or self.query.get_initial_alias()
field, targets, opts, joins, path, transform_function = self.query.setup_joins(pieces, opts, alias)
alias = joins[-1]
return field, targets, alias, joins, path, opts, transform_function
def get_from_clause(self):
"""
Return a list of strings that are joined together to go after the
"FROM" part of the query, as well as a list any extra parameters that
need to be included. Subclasses, can override this to create a
from-clause via a "select".
This should only be called after any SQL construction methods that
might change the tables that are needed. This means the select columns,
ordering, and distinct must be done first.
"""
result = []
params = []
for alias in tuple(self.query.alias_map):
if not self.query.alias_refcount[alias]:
continue
try:
from_clause = self.query.alias_map[alias]
except KeyError:
# Extra tables can end up in self.tables, but not in the
# alias_map if they aren't in a join. That's OK. We skip them.
continue
clause_sql, clause_params = self.compile(from_clause)
result.append(clause_sql)
params.extend(clause_params)
for t in self.query.extra_tables:
alias, _ = self.query.table_alias(t)
# Only add the alias if it's not already present (the table_alias()
# call increments the refcount, so an alias refcount of one means
# this is the only reference).
if alias not in self.query.alias_map or self.query.alias_refcount[alias] == 1:
result.append(', %s' % self.quote_name_unless_alias(alias))
return result, params
def get_related_selections(self, select, opts=None, root_alias=None, cur_depth=1,
requested=None, restricted=None):
"""
Fill in the information needed for a select_related query. The current
depth is measured as the number of connections away from the root model
(for example, cur_depth=1 means we are looking at models with direct
connections to the root model).
"""
def _get_field_choices():
direct_choices = (f.name for f in opts.fields if f.is_relation)
reverse_choices = (
f.field.related_query_name()
for f in opts.related_objects if f.field.unique
)
return chain(direct_choices, reverse_choices, self.query._filtered_relations)
related_klass_infos = []
if not restricted and cur_depth > self.query.max_depth:
# We've recursed far enough; bail out.
return related_klass_infos
if not opts:
opts = self.query.get_meta()
root_alias = self.query.get_initial_alias()
only_load = self.query.get_loaded_field_names()
# Setup for the case when only particular related fields should be
# included in the related selection.
fields_found = set()
if requested is None:
restricted = isinstance(self.query.select_related, dict)
if restricted:
requested = self.query.select_related
def get_related_klass_infos(klass_info, related_klass_infos):
klass_info['related_klass_infos'] = related_klass_infos
for f in opts.fields:
field_model = f.model._meta.concrete_model
fields_found.add(f.name)
if restricted:
next = requested.get(f.name, {})
if not f.is_relation:
# If a non-related field is used like a relation,
# or if a single non-relational field is given.
if next or f.name in requested:
raise FieldError(
"Non-relational field given in select_related: '%s'. "
"Choices are: %s" % (
f.name,
", ".join(_get_field_choices()) or '(none)',
)
)
else:
next = False
if not select_related_descend(f, restricted, requested,
only_load.get(field_model)):
continue
klass_info = {
'model': f.remote_field.model,
'field': f,
'reverse': False,
'local_setter': f.set_cached_value,
'remote_setter': f.remote_field.set_cached_value if f.unique else lambda x, y: None,
'from_parent': False,
}
related_klass_infos.append(klass_info)
select_fields = []
_, _, _, joins, _, _ = self.query.setup_joins(
[f.name], opts, root_alias)
alias = joins[-1]
columns = self.get_default_columns(start_alias=alias, opts=f.remote_field.model._meta)
for col in columns:
select_fields.append(len(select))
select.append((col, None))
klass_info['select_fields'] = select_fields
next_klass_infos = self.get_related_selections(
select, f.remote_field.model._meta, alias, cur_depth + 1, next, restricted)
get_related_klass_infos(klass_info, next_klass_infos)
if restricted:
related_fields = [
(o.field, o.related_model)
for o in opts.related_objects
if o.field.unique and not o.many_to_many
]
for f, model in related_fields:
if not select_related_descend(f, restricted, requested,
only_load.get(model), reverse=True):
continue
related_field_name = f.related_query_name()
fields_found.add(related_field_name)
join_info = self.query.setup_joins([related_field_name], opts, root_alias)
alias = join_info.joins[-1]
from_parent = issubclass(model, opts.model) and model is not opts.model
klass_info = {
'model': model,
'field': f,
'reverse': True,
'local_setter': f.remote_field.set_cached_value,
'remote_setter': f.set_cached_value,
'from_parent': from_parent,
}
related_klass_infos.append(klass_info)
select_fields = []
columns = self.get_default_columns(
start_alias=alias, opts=model._meta, from_parent=opts.model)
for col in columns:
select_fields.append(len(select))
select.append((col, None))
klass_info['select_fields'] = select_fields
next = requested.get(f.related_query_name(), {})
next_klass_infos = self.get_related_selections(
select, model._meta, alias, cur_depth + 1,
next, restricted)
get_related_klass_infos(klass_info, next_klass_infos)
def local_setter(obj, from_obj):
# Set a reverse fk object when relation is non-empty.
if from_obj:
f.remote_field.set_cached_value(from_obj, obj)
def remote_setter(name, obj, from_obj):
setattr(from_obj, name, obj)
for name in list(requested):
# Filtered relations work only on the topmost level.
if cur_depth > 1:
break
if name in self.query._filtered_relations:
fields_found.add(name)
f, _, join_opts, joins, _, _ = self.query.setup_joins([name], opts, root_alias)
model = join_opts.model
alias = joins[-1]
from_parent = issubclass(model, opts.model) and model is not opts.model
klass_info = {
'model': model,
'field': f,
'reverse': True,
'local_setter': local_setter,
'remote_setter': partial(remote_setter, name),
'from_parent': from_parent,
}
related_klass_infos.append(klass_info)
select_fields = []
columns = self.get_default_columns(
start_alias=alias, opts=model._meta,
from_parent=opts.model,
)
for col in columns:
select_fields.append(len(select))
select.append((col, None))
klass_info['select_fields'] = select_fields
next_requested = requested.get(name, {})
next_klass_infos = self.get_related_selections(
select, opts=model._meta, root_alias=alias,
cur_depth=cur_depth + 1, requested=next_requested,
restricted=restricted,
)
get_related_klass_infos(klass_info, next_klass_infos)
fields_not_found = set(requested).difference(fields_found)
if fields_not_found:
invalid_fields = ("'%s'" % s for s in fields_not_found)
raise FieldError(
'Invalid field name(s) given in select_related: %s. '
'Choices are: %s' % (
', '.join(invalid_fields),
', '.join(_get_field_choices()) or '(none)',
)
)
return related_klass_infos
def get_select_for_update_of_arguments(self):
"""
Return a quoted list of arguments for the SELECT FOR UPDATE OF part of
the query.
"""
def _get_parent_klass_info(klass_info):
return (
{
'model': parent_model,
'field': parent_link,
'reverse': False,
'select_fields': [
select_index
for select_index in klass_info['select_fields']
if self.select[select_index][0].target.model == parent_model
],
}
for parent_model, parent_link in klass_info['model']._meta.parents.items()
)
def _get_field_choices():
"""Yield all allowed field paths in breadth-first search order."""
queue = collections.deque([(None, self.klass_info)])
while queue:
parent_path, klass_info = queue.popleft()
if parent_path is None:
path = []
yield 'self'
else:
field = klass_info['field']
if klass_info['reverse']:
field = field.remote_field
path = parent_path + [field.name]
yield LOOKUP_SEP.join(path)
queue.extend(
(path, klass_info)
for klass_info in _get_parent_klass_info(klass_info)
)
queue.extend(
(path, klass_info)
for klass_info in klass_info.get('related_klass_infos', [])
)
result = []
invalid_names = []
for name in self.query.select_for_update_of:
klass_info = self.klass_info
if name == 'self':
# Find the first selected column from a base model. If it
# doesn't exist, don't lock a base model.
for select_index in klass_info['select_fields']:
if self.select[select_index][0].target.model == klass_info['model']:
col = self.select[select_index][0]
break
else:
col = None
else:
for part in name.split(LOOKUP_SEP):
klass_infos = (
*klass_info.get('related_klass_infos', []),
*_get_parent_klass_info(klass_info),
)
for related_klass_info in klass_infos:
field = related_klass_info['field']
if related_klass_info['reverse']:
field = field.remote_field
if field.name == part:
klass_info = related_klass_info
break
else:
klass_info = None
break
if klass_info is None:
invalid_names.append(name)
continue
select_index = klass_info['select_fields'][0]
col = self.select[select_index][0]
if col is not None:
if self.connection.features.select_for_update_of_column:
result.append(self.compile(col)[0])
else:
result.append(self.quote_name_unless_alias(col.alias))
if invalid_names:
raise FieldError(
'Invalid field name(s) given in select_for_update(of=(...)): %s. '
'Only relational fields followed in the query are allowed. '
'Choices are: %s.' % (
', '.join(invalid_names),
', '.join(_get_field_choices()),
)
)
return result
def deferred_to_columns(self):
"""
Convert the self.deferred_loading data structure to mapping of table
names to sets of column names which are to be loaded. Return the
dictionary.
"""
columns = {}
self.query.deferred_to_data(columns, self.query.get_loaded_field_names_cb)
return columns
def get_converters(self, expressions):
converters = {}
for i, expression in enumerate(expressions):
if expression:
backend_converters = self.connection.ops.get_db_converters(expression)
field_converters = expression.get_db_converters(self.connection)
if backend_converters or field_converters:
converters[i] = (backend_converters + field_converters, expression)
return converters
def apply_converters(self, rows, converters):
connection = self.connection
converters = list(converters.items())
for row in map(list, rows):
for pos, (convs, expression) in converters:
value = row[pos]
for converter in convs:
value = converter(value, expression, connection)
row[pos] = value
yield row
def results_iter(self, results=None, tuple_expected=False, chunked_fetch=False,
chunk_size=GET_ITERATOR_CHUNK_SIZE):
"""Return an iterator over the results from executing this query."""
if results is None:
results = self.execute_sql(MULTI, chunked_fetch=chunked_fetch, chunk_size=chunk_size)
fields = [s[0] for s in self.select[0:self.col_count]]
converters = self.get_converters(fields)
rows = chain.from_iterable(results)
if converters:
rows = self.apply_converters(rows, converters)
if tuple_expected:
rows = map(tuple, rows)
return rows
def has_results(self):
"""
Backends (e.g. NoSQL) can override this in order to use optimized
versions of "query has any results."
"""
# This is always executed on a query clone, so we can modify self.query
self.query.add_extra({'a': 1}, None, None, None, None, None)
self.query.set_extra_mask(['a'])
return bool(self.execute_sql(SINGLE))
def execute_sql(self, result_type=MULTI, chunked_fetch=False, chunk_size=GET_ITERATOR_CHUNK_SIZE):
"""
Run the query against the database and return the result(s). The
return value is a single data item if result_type is SINGLE, or an
iterator over the results if the result_type is MULTI.
result_type is either MULTI (use fetchmany() to retrieve all rows),
SINGLE (only retrieve a single row), or None. In this last case, the
cursor is returned if any query is executed, since it's used by
subclasses such as InsertQuery). It's possible, however, that no query
is needed, as the filters describe an empty set. In that case, None is
returned, to avoid any unnecessary database interaction.
"""
result_type = result_type or NO_RESULTS
try:
sql, params = self.as_sql()
if not sql:
raise EmptyResultSet
except EmptyResultSet:
if result_type == MULTI:
return iter([])
else:
return
if chunked_fetch:
cursor = self.connection.chunked_cursor()
else:
cursor = self.connection.cursor()
try:
cursor.execute(sql, params)
except Exception:
# Might fail for server-side cursors (e.g. connection closed)
cursor.close()
raise
if result_type == CURSOR:
# Give the caller the cursor to process and close.
return cursor
if result_type == SINGLE:
try:
val = cursor.fetchone()
if val:
return val[0:self.col_count]
return val
finally:
# done with the cursor
cursor.close()
if result_type == NO_RESULTS:
cursor.close()
return
result = cursor_iter(
cursor, self.connection.features.empty_fetchmany_value,
self.col_count if self.has_extra_select else None,
chunk_size,
)
if not chunked_fetch or not self.connection.features.can_use_chunked_reads:
try:
# If we are using non-chunked reads, we return the same data
# structure as normally, but ensure it is all read into memory
# before going any further. Use chunked_fetch if requested,
# unless the database doesn't support it.
return list(result)
finally:
# done with the cursor
cursor.close()
return result
def as_subquery_condition(self, alias, columns, compiler):
qn = compiler.quote_name_unless_alias
qn2 = self.connection.ops.quote_name
for index, select_col in enumerate(self.query.select):
lhs_sql, lhs_params = self.compile(select_col)
rhs = '%s.%s' % (qn(alias), qn2(columns[index]))
self.query.where.add(
RawSQL('%s = %s' % (lhs_sql, rhs), lhs_params), 'AND')
sql, params = self.as_sql()
return 'EXISTS (%s)' % sql, params
def explain_query(self):
result = list(self.execute_sql())
# Some backends return 1 item tuples with strings, and others return
# tuples with integers and strings. Flatten them out into strings.
for row in result[0]:
if not isinstance(row, str):
yield ' '.join(str(c) for c in row)
else:
yield row
class SQLInsertCompiler(SQLCompiler):
returning_fields = None
returning_params = tuple()
def field_as_sql(self, field, val):
"""
Take a field and a value intended to be saved on that field, and
return placeholder SQL and accompanying params. Check for raw values,
expressions, and fields with get_placeholder() defined in that order.
When field is None, consider the value raw and use it as the
placeholder, with no corresponding parameters returned.
"""
if field is None:
# A field value of None means the value is raw.
sql, params = val, []
elif hasattr(val, 'as_sql'):
# This is an expression, let's compile it.
sql, params = self.compile(val)
elif hasattr(field, 'get_placeholder'):
# Some fields (e.g. geo fields) need special munging before
# they can be inserted.
sql, params = field.get_placeholder(val, self, self.connection), [val]
else:
# Return the common case for the placeholder
sql, params = '%s', [val]
# The following hook is only used by Oracle Spatial, which sometimes
# needs to yield 'NULL' and [] as its placeholder and params instead
# of '%s' and [None]. The 'NULL' placeholder is produced earlier by
# OracleOperations.get_geom_placeholder(). The following line removes
# the corresponding None parameter. See ticket #10888.
params = self.connection.ops.modify_insert_params(sql, params)
return sql, params
def prepare_value(self, field, value):
"""
Prepare a value to be used in a query by resolving it if it is an
expression and otherwise calling the field's get_db_prep_save().
"""
if hasattr(value, 'resolve_expression'):
value = value.resolve_expression(self.query, allow_joins=False, for_save=True)
# Don't allow values containing Col expressions. They refer to
# existing columns on a row, but in the case of insert the row
# doesn't exist yet.
if value.contains_column_references:
raise ValueError(
'Failed to insert expression "%s" on %s. F() expressions '
'can only be used to update, not to insert.' % (value, field)
)
if value.contains_aggregate:
raise FieldError(
'Aggregate functions are not allowed in this query '
'(%s=%r).' % (field.name, value)
)
if value.contains_over_clause:
raise FieldError(
'Window expressions are not allowed in this query (%s=%r).'
% (field.name, value)
)
else:
value = field.get_db_prep_save(value, connection=self.connection)
return value
def pre_save_val(self, field, obj):
"""
Get the given field's value off the given obj. pre_save() is used for
things like auto_now on DateTimeField. Skip it if this is a raw query.
"""
if self.query.raw:
return getattr(obj, field.attname)
return field.pre_save(obj, add=True)
def assemble_as_sql(self, fields, value_rows):
"""
Take a sequence of N fields and a sequence of M rows of values, and
generate placeholder SQL and parameters for each field and value.
Return a pair containing:
* a sequence of M rows of N SQL placeholder strings, and
* a sequence of M rows of corresponding parameter values.
Each placeholder string may contain any number of '%s' interpolation
strings, and each parameter row will contain exactly as many params
as the total number of '%s's in the corresponding placeholder row.
"""
if not value_rows:
return [], []
# list of (sql, [params]) tuples for each object to be saved
# Shape: [n_objs][n_fields][2]
rows_of_fields_as_sql = (
(self.field_as_sql(field, v) for field, v in zip(fields, row))
for row in value_rows
)
# tuple like ([sqls], [[params]s]) for each object to be saved
# Shape: [n_objs][2][n_fields]
sql_and_param_pair_rows = (zip(*row) for row in rows_of_fields_as_sql)
# Extract separate lists for placeholders and params.
# Each of these has shape [n_objs][n_fields]
placeholder_rows, param_rows = zip(*sql_and_param_pair_rows)
# Params for each field are still lists, and need to be flattened.
param_rows = [[p for ps in row for p in ps] for row in param_rows]
return placeholder_rows, param_rows
def as_sql(self):
# We don't need quote_name_unless_alias() here, since these are all
# going to be column names (so we can avoid the extra overhead).
qn = self.connection.ops.quote_name
opts = self.query.get_meta()
insert_statement = self.connection.ops.insert_statement(ignore_conflicts=self.query.ignore_conflicts)
result = ['%s %s' % (insert_statement, qn(opts.db_table))]
fields = self.query.fields or [opts.pk]
result.append('(%s)' % ', '.join(qn(f.column) for f in fields))
if self.query.fields:
value_rows = [
[self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
for obj in self.query.objs
]
else:
# An empty object.
value_rows = [[self.connection.ops.pk_default_value()] for _ in self.query.objs]
fields = [None]
# Currently the backends just accept values when generating bulk
# queries and generate their own placeholders. Doing that isn't
# necessary and it should be possible to use placeholders and
# expressions in bulk inserts too.
can_bulk = (not self.returning_fields and self.connection.features.has_bulk_insert)
placeholder_rows, param_rows = self.assemble_as_sql(fields, value_rows)
ignore_conflicts_suffix_sql = self.connection.ops.ignore_conflicts_suffix_sql(
ignore_conflicts=self.query.ignore_conflicts
)
if self.returning_fields and self.connection.features.can_return_columns_from_insert:
if self.connection.features.can_return_rows_from_bulk_insert:
result.append(self.connection.ops.bulk_insert_sql(fields, placeholder_rows))
params = param_rows
else:
result.append("VALUES (%s)" % ", ".join(placeholder_rows[0]))
params = [param_rows[0]]
if ignore_conflicts_suffix_sql:
result.append(ignore_conflicts_suffix_sql)
# Skip empty r_sql to allow subclasses to customize behavior for
# 3rd party backends. Refs #19096.
r_sql, self.returning_params = self.connection.ops.return_insert_columns(self.returning_fields)
if r_sql:
result.append(r_sql)
params += [self.returning_params]
return [(" ".join(result), tuple(chain.from_iterable(params)))]
if can_bulk:
result.append(self.connection.ops.bulk_insert_sql(fields, placeholder_rows))
if ignore_conflicts_suffix_sql:
result.append(ignore_conflicts_suffix_sql)
return [(" ".join(result), tuple(p for ps in param_rows for p in ps))]
else:
if ignore_conflicts_suffix_sql:
result.append(ignore_conflicts_suffix_sql)
return [
(" ".join(result + ["VALUES (%s)" % ", ".join(p)]), vals)
for p, vals in zip(placeholder_rows, param_rows)
]
def execute_sql(self, returning_fields=None):
assert not (
returning_fields and len(self.query.objs) != 1 and
not self.connection.features.can_return_rows_from_bulk_insert
)
self.returning_fields = returning_fields
with self.connection.cursor() as cursor:
for sql, params in self.as_sql():
cursor.execute(sql, params)
if not self.returning_fields:
return []
if self.connection.features.can_return_rows_from_bulk_insert and len(self.query.objs) > 1:
return self.connection.ops.fetch_returned_insert_rows(cursor)
if self.connection.features.can_return_columns_from_insert:
assert len(self.query.objs) == 1
return self.connection.ops.fetch_returned_insert_columns(cursor, self.returning_params)
return [self.connection.ops.last_insert_id(
cursor, self.query.get_meta().db_table, self.query.get_meta().pk.column
)]
class SQLDeleteCompiler(SQLCompiler):
@cached_property
def single_alias(self):
return sum(self.query.alias_refcount[t] > 0 for t in self.query.alias_map) == 1
def _as_sql(self, query):
result = [
'DELETE FROM %s' % self.quote_name_unless_alias(query.base_table)
]
where, params = self.compile(query.where)
if where:
result.append('WHERE %s' % where)
return ' '.join(result), tuple(params)
def as_sql(self):
"""
Create the SQL for this query. Return the SQL string and list of
parameters.
"""
if self.single_alias:
return self._as_sql(self.query)
innerq = self.query.clone()
innerq.__class__ = Query
innerq.clear_select_clause()
pk = self.query.model._meta.pk
innerq.select = [
pk.get_col(self.query.get_initial_alias())
]
outerq = Query(self.query.model)
outerq.where = self.query.where_class()
outerq.add_q(Q(pk__in=innerq))
return self._as_sql(outerq)
class SQLUpdateCompiler(SQLCompiler):
def as_sql(self):
"""
Create the SQL for this query. Return the SQL string and list of
parameters.
"""
self.pre_sql_setup()
if not self.query.values:
return '', ()
qn = self.quote_name_unless_alias
values, update_params = [], []
for field, model, val in self.query.values:
if hasattr(val, 'resolve_expression'):
val = val.resolve_expression(self.query, allow_joins=False, for_save=True)
if val.contains_aggregate:
raise FieldError(
'Aggregate functions are not allowed in this query '
'(%s=%r).' % (field.name, val)
)
if val.contains_over_clause:
raise FieldError(
'Window expressions are not allowed in this query '
'(%s=%r).' % (field.name, val)
)
elif hasattr(val, 'prepare_database_save'):
if field.remote_field:
val = field.get_db_prep_save(
val.prepare_database_save(field),
connection=self.connection,
)
else:
raise TypeError(
"Tried to update field %s with a model instance, %r. "
"Use a value compatible with %s."
% (field, val, field.__class__.__name__)
)
else:
val = field.get_db_prep_save(val, connection=self.connection)
# Getting the placeholder for the field.
if hasattr(field, 'get_placeholder'):
placeholder = field.get_placeholder(val, self, self.connection)
else:
placeholder = '%s'
name = field.column
if hasattr(val, 'as_sql'):
sql, params = self.compile(val)
values.append('%s = %s' % (qn(name), placeholder % sql))
update_params.extend(params)
elif val is not None:
values.append('%s = %s' % (qn(name), placeholder))
update_params.append(val)
else:
values.append('%s = NULL' % qn(name))
table = self.query.base_table
result = [
'UPDATE %s SET' % qn(table),
', '.join(values),
]
where, params = self.compile(self.query.where)
if where:
result.append('WHERE %s' % where)
return ' '.join(result), tuple(update_params + params)
def execute_sql(self, result_type):
"""
Execute the specified update. Return the number of rows affected by
the primary update query. The "primary update query" is the first
non-empty query that is executed. Row counts for any subsequent,
related queries are not available.
"""
cursor = super().execute_sql(result_type)
try:
rows = cursor.rowcount if cursor else 0
is_empty = cursor is None
finally:
if cursor:
cursor.close()
for query in self.query.get_related_updates():
aux_rows = query.get_compiler(self.using).execute_sql(result_type)
if is_empty and aux_rows:
rows = aux_rows
is_empty = False
return rows
def pre_sql_setup(self):
"""
If the update depends on results from other tables, munge the "where"
conditions to match the format required for (portable) SQL updates.
If multiple updates are required, pull out the id values to update at
this point so that they don't change as a result of the progressive
updates.
"""
refcounts_before = self.query.alias_refcount.copy()
# Ensure base table is in the query
self.query.get_initial_alias()
count = self.query.count_active_tables()
if not self.query.related_updates and count == 1:
return
query = self.query.chain(klass=Query)
query.select_related = False
query.clear_ordering(True)
query.extra = {}
query.select = []
query.add_fields([query.get_meta().pk.name])
super().pre_sql_setup()
must_pre_select = count > 1 and not self.connection.features.update_can_self_select
# Now we adjust the current query: reset the where clause and get rid
# of all the tables we don't need (since they're in the sub-select).
self.query.where = self.query.where_class()
if self.query.related_updates or must_pre_select:
# Either we're using the idents in multiple update queries (so
# don't want them to change), or the db backend doesn't support
# selecting from the updating table (e.g. MySQL).
idents = []
for rows in query.get_compiler(self.using).execute_sql(MULTI):
idents.extend(r[0] for r in rows)
self.query.add_filter(('pk__in', idents))
self.query.related_ids = idents
else:
# The fast path. Filters and updates in one query.
self.query.add_filter(('pk__in', query))
self.query.reset_refcounts(refcounts_before)
class SQLAggregateCompiler(SQLCompiler):
def as_sql(self):
"""
Create the SQL for this query. Return the SQL string and list of
parameters.
"""
sql, params = [], []
for annotation in self.query.annotation_select.values():
ann_sql, ann_params = self.compile(annotation)
ann_sql, ann_params = annotation.select_format(self, ann_sql, ann_params)
sql.append(ann_sql)
params.extend(ann_params)
self.col_count = len(self.query.annotation_select)
sql = ', '.join(sql)
params = tuple(params)
sql = 'SELECT %s FROM (%s) subquery' % (sql, self.query.subquery)
params = params + self.query.sub_params
return sql, params
def cursor_iter(cursor, sentinel, col_count, itersize):
"""
Yield blocks of rows from a cursor and ensure the cursor is closed when
done.
"""
try:
for rows in iter((lambda: cursor.fetchmany(itersize)), sentinel):
yield rows if col_count is None else [r[:col_count] for r in rows]
finally:
cursor.close()
|
08aafe474541baef6a3edb5a040b0d3e8422a65dffc8ce4855235160dd560d85 | from django.db import InterfaceError
from django.db.backends.base.features import BaseDatabaseFeatures
class DatabaseFeatures(BaseDatabaseFeatures):
interprets_empty_strings_as_nulls = True
has_select_for_update = True
has_select_for_update_nowait = True
has_select_for_update_skip_locked = True
has_select_for_update_of = True
select_for_update_of_column = True
can_return_columns_from_insert = True
can_introspect_autofield = True
supports_subqueries_in_group_by = False
supports_transactions = True
supports_timezones = False
has_native_duration_field = True
can_defer_constraint_checks = True
supports_partially_nullable_unique_constraints = False
truncates_names = True
supports_tablespaces = True
supports_sequence_reset = False
can_introspect_materialized_views = True
can_introspect_time_field = False
atomic_transactions = False
supports_combined_alters = False
nulls_order_largest = True
requires_literal_defaults = True
closed_cursor_error_class = InterfaceError
bare_select_suffix = " FROM DUAL"
# select for update with limit can be achieved on Oracle, but not with the current backend.
supports_select_for_update_with_limit = False
supports_temporal_subtraction = True
# Oracle doesn't ignore quoted identifiers case but the current backend
# does by uppercasing all identifiers.
ignores_table_name_case = True
supports_index_on_text_field = False
has_case_insensitive_like = False
create_test_procedure_without_params_sql = """
CREATE PROCEDURE "TEST_PROCEDURE" AS
V_I INTEGER;
BEGIN
V_I := 1;
END;
"""
create_test_procedure_with_int_param_sql = """
CREATE PROCEDURE "TEST_PROCEDURE" (P_I INTEGER) AS
V_I INTEGER;
BEGIN
V_I := P_I;
END;
"""
supports_callproc_kwargs = True
supports_over_clause = True
supports_frame_range_fixed_distance = True
supports_ignore_conflicts = False
max_query_params = 2**16 - 1
supports_partial_indexes = False
supports_slicing_ordering_in_compound = True
allows_multiple_constraints_on_same_fields = False
supports_boolean_expr_in_select_clause = False
|
f3755b974f10409dd5f2399278ee86c180c77110c0347f099af2d3d34d80d85d | """
Oracle database backend for Django.
Requires cx_Oracle: https://oracle.github.io/python-cx_Oracle/
"""
import datetime
import decimal
import os
import platform
from contextlib import contextmanager
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.db import IntegrityError
from django.db.backends.base.base import BaseDatabaseWrapper
from django.utils.asyncio import async_unsafe
from django.utils.encoding import force_bytes, force_str
from django.utils.functional import cached_property
def _setup_environment(environ):
# Cygwin requires some special voodoo to set the environment variables
# properly so that Oracle will see them.
if platform.system().upper().startswith('CYGWIN'):
try:
import ctypes
except ImportError as e:
raise ImproperlyConfigured("Error loading ctypes: %s; "
"the Oracle backend requires ctypes to "
"operate correctly under Cygwin." % e)
kernel32 = ctypes.CDLL('kernel32')
for name, value in environ:
kernel32.SetEnvironmentVariableA(name, value)
else:
os.environ.update(environ)
_setup_environment([
# Oracle takes client-side character set encoding from the environment.
('NLS_LANG', '.AL32UTF8'),
# This prevents unicode from getting mangled by getting encoded into the
# potentially non-unicode database character set.
('ORA_NCHAR_LITERAL_REPLACE', 'TRUE'),
])
try:
import cx_Oracle as Database
except ImportError as e:
raise ImproperlyConfigured("Error loading cx_Oracle module: %s" % e)
# Some of these import cx_Oracle, so import them after checking if it's installed.
from .client import DatabaseClient # NOQA isort:skip
from .creation import DatabaseCreation # NOQA isort:skip
from .features import DatabaseFeatures # NOQA isort:skip
from .introspection import DatabaseIntrospection # NOQA isort:skip
from .operations import DatabaseOperations # NOQA isort:skip
from .schema import DatabaseSchemaEditor # NOQA isort:skip
from .utils import Oracle_datetime # NOQA isort:skip
from .validation import DatabaseValidation # NOQA isort:skip
@contextmanager
def wrap_oracle_errors():
try:
yield
except Database.DatabaseError as e:
# cx_Oracle raises a cx_Oracle.DatabaseError exception with the
# following attributes and values:
# code = 2091
# message = 'ORA-02091: transaction rolled back
# 'ORA-02291: integrity constraint (TEST_DJANGOTEST.SYS
# _C00102056) violated - parent key not found'
# Convert that case to Django's IntegrityError exception.
x = e.args[0]
if hasattr(x, 'code') and hasattr(x, 'message') and x.code == 2091 and 'ORA-02291' in x.message:
raise IntegrityError(*tuple(e.args))
raise
class _UninitializedOperatorsDescriptor:
def __get__(self, instance, cls=None):
# If connection.operators is looked up before a connection has been
# created, transparently initialize connection.operators to avert an
# AttributeError.
if instance is None:
raise AttributeError("operators not available as class attribute")
# Creating a cursor will initialize the operators.
instance.cursor().close()
return instance.__dict__['operators']
class DatabaseWrapper(BaseDatabaseWrapper):
vendor = 'oracle'
display_name = 'Oracle'
# This dictionary maps Field objects to their associated Oracle column
# types, as strings. Column-type strings can contain format strings; they'll
# be interpolated against the values of Field.__dict__ before being output.
# If a column type is set to None, it won't be included in the output.
#
# Any format strings starting with "qn_" are quoted before being used in the
# output (the "qn_" prefix is stripped before the lookup is performed.
data_types = {
'AutoField': 'NUMBER(11) GENERATED BY DEFAULT ON NULL AS IDENTITY',
'BigAutoField': 'NUMBER(19) GENERATED BY DEFAULT ON NULL AS IDENTITY',
'BinaryField': 'BLOB',
'BooleanField': 'NUMBER(1)',
'CharField': 'NVARCHAR2(%(max_length)s)',
'DateField': 'DATE',
'DateTimeField': 'TIMESTAMP',
'DecimalField': 'NUMBER(%(max_digits)s, %(decimal_places)s)',
'DurationField': 'INTERVAL DAY(9) TO SECOND(6)',
'FileField': 'NVARCHAR2(%(max_length)s)',
'FilePathField': 'NVARCHAR2(%(max_length)s)',
'FloatField': 'DOUBLE PRECISION',
'IntegerField': 'NUMBER(11)',
'BigIntegerField': 'NUMBER(19)',
'IPAddressField': 'VARCHAR2(15)',
'GenericIPAddressField': 'VARCHAR2(39)',
'NullBooleanField': 'NUMBER(1)',
'OneToOneField': 'NUMBER(11)',
'PositiveBigIntegerField': 'NUMBER(19)',
'PositiveIntegerField': 'NUMBER(11)',
'PositiveSmallIntegerField': 'NUMBER(11)',
'SlugField': 'NVARCHAR2(%(max_length)s)',
'SmallAutoField': 'NUMBER(5) GENERATED BY DEFAULT ON NULL AS IDENTITY',
'SmallIntegerField': 'NUMBER(11)',
'TextField': 'NCLOB',
'TimeField': 'TIMESTAMP',
'URLField': 'VARCHAR2(%(max_length)s)',
'UUIDField': 'VARCHAR2(32)',
}
data_type_check_constraints = {
'BooleanField': '%(qn_column)s IN (0,1)',
'NullBooleanField': '%(qn_column)s IN (0,1)',
'PositiveBigIntegerField': '%(qn_column)s >= 0',
'PositiveIntegerField': '%(qn_column)s >= 0',
'PositiveSmallIntegerField': '%(qn_column)s >= 0',
}
# Oracle doesn't support a database index on these columns.
_limited_data_types = ('clob', 'nclob', 'blob')
operators = _UninitializedOperatorsDescriptor()
_standard_operators = {
'exact': '= %s',
'iexact': '= UPPER(%s)',
'contains': "LIKE TRANSLATE(%s USING NCHAR_CS) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
'icontains': "LIKE UPPER(TRANSLATE(%s USING NCHAR_CS)) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
'gt': '> %s',
'gte': '>= %s',
'lt': '< %s',
'lte': '<= %s',
'startswith': "LIKE TRANSLATE(%s USING NCHAR_CS) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
'endswith': "LIKE TRANSLATE(%s USING NCHAR_CS) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
'istartswith': "LIKE UPPER(TRANSLATE(%s USING NCHAR_CS)) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
'iendswith': "LIKE UPPER(TRANSLATE(%s USING NCHAR_CS)) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
}
_likec_operators = {
**_standard_operators,
'contains': "LIKEC %s ESCAPE '\\'",
'icontains': "LIKEC UPPER(%s) ESCAPE '\\'",
'startswith': "LIKEC %s ESCAPE '\\'",
'endswith': "LIKEC %s ESCAPE '\\'",
'istartswith': "LIKEC UPPER(%s) ESCAPE '\\'",
'iendswith': "LIKEC UPPER(%s) ESCAPE '\\'",
}
# The patterns below are used to generate SQL pattern lookup clauses when
# the right-hand side of the lookup isn't a raw string (it might be an expression
# or the result of a bilateral transformation).
# In those cases, special characters for LIKE operators (e.g. \, %, _)
# should be escaped on the database side.
#
# Note: we use str.format() here for readability as '%' is used as a wildcard for
# the LIKE operator.
pattern_esc = r"REPLACE(REPLACE(REPLACE({}, '\', '\\'), '%%', '\%%'), '_', '\_')"
_pattern_ops = {
'contains': "'%%' || {} || '%%'",
'icontains': "'%%' || UPPER({}) || '%%'",
'startswith': "{} || '%%'",
'istartswith': "UPPER({}) || '%%'",
'endswith': "'%%' || {}",
'iendswith': "'%%' || UPPER({})",
}
_standard_pattern_ops = {k: "LIKE TRANSLATE( " + v + " USING NCHAR_CS)"
" ESCAPE TRANSLATE('\\' USING NCHAR_CS)"
for k, v in _pattern_ops.items()}
_likec_pattern_ops = {k: "LIKEC " + v + " ESCAPE '\\'"
for k, v in _pattern_ops.items()}
Database = Database
SchemaEditorClass = DatabaseSchemaEditor
# Classes instantiated in __init__().
client_class = DatabaseClient
creation_class = DatabaseCreation
features_class = DatabaseFeatures
introspection_class = DatabaseIntrospection
ops_class = DatabaseOperations
validation_class = DatabaseValidation
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
use_returning_into = self.settings_dict["OPTIONS"].get('use_returning_into', True)
self.features.can_return_columns_from_insert = use_returning_into
def _dsn(self):
settings_dict = self.settings_dict
if not settings_dict['HOST'].strip():
settings_dict['HOST'] = 'localhost'
if settings_dict['PORT']:
return Database.makedsn(settings_dict['HOST'], int(settings_dict['PORT']), settings_dict['NAME'])
return settings_dict['NAME']
def _connect_string(self):
return '%s/"%s"@%s' % (self.settings_dict['USER'], self.settings_dict['PASSWORD'], self._dsn())
def get_connection_params(self):
conn_params = self.settings_dict['OPTIONS'].copy()
if 'use_returning_into' in conn_params:
del conn_params['use_returning_into']
return conn_params
@async_unsafe
def get_new_connection(self, conn_params):
return Database.connect(
user=self.settings_dict['USER'],
password=self.settings_dict['PASSWORD'],
dsn=self._dsn(),
**conn_params,
)
def init_connection_state(self):
cursor = self.create_cursor()
# Set the territory first. The territory overrides NLS_DATE_FORMAT
# and NLS_TIMESTAMP_FORMAT to the territory default. When all of
# these are set in single statement it isn't clear what is supposed
# to happen.
cursor.execute("ALTER SESSION SET NLS_TERRITORY = 'AMERICA'")
# Set Oracle date to ANSI date format. This only needs to execute
# once when we create a new connection. We also set the Territory
# to 'AMERICA' which forces Sunday to evaluate to a '1' in
# TO_CHAR().
cursor.execute(
"ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS'"
" NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'" +
(" TIME_ZONE = 'UTC'" if settings.USE_TZ else '')
)
cursor.close()
if 'operators' not in self.__dict__:
# Ticket #14149: Check whether our LIKE implementation will
# work for this connection or we need to fall back on LIKEC.
# This check is performed only once per DatabaseWrapper
# instance per thread, since subsequent connections will use
# the same settings.
cursor = self.create_cursor()
try:
cursor.execute("SELECT 1 FROM DUAL WHERE DUMMY %s"
% self._standard_operators['contains'],
['X'])
except Database.DatabaseError:
self.operators = self._likec_operators
self.pattern_ops = self._likec_pattern_ops
else:
self.operators = self._standard_operators
self.pattern_ops = self._standard_pattern_ops
cursor.close()
self.connection.stmtcachesize = 20
# Ensure all changes are preserved even when AUTOCOMMIT is False.
if not self.get_autocommit():
self.commit()
@async_unsafe
def create_cursor(self, name=None):
return FormatStylePlaceholderCursor(self.connection)
def _commit(self):
if self.connection is not None:
with wrap_oracle_errors():
return self.connection.commit()
# Oracle doesn't support releasing savepoints. But we fake them when query
# logging is enabled to keep query counts consistent with other backends.
def _savepoint_commit(self, sid):
if self.queries_logged:
self.queries_log.append({
'sql': '-- RELEASE SAVEPOINT %s (faked)' % self.ops.quote_name(sid),
'time': '0.000',
})
def _set_autocommit(self, autocommit):
with self.wrap_database_errors:
self.connection.autocommit = autocommit
def check_constraints(self, table_names=None):
"""
Check constraints by setting them to immediate. Return them to deferred
afterward.
"""
self.cursor().execute('SET CONSTRAINTS ALL IMMEDIATE')
self.cursor().execute('SET CONSTRAINTS ALL DEFERRED')
def is_usable(self):
try:
self.connection.ping()
except Database.Error:
return False
else:
return True
@cached_property
def oracle_version(self):
with self.temporary_connection():
return tuple(int(x) for x in self.connection.version.split('.'))
class OracleParam:
"""
Wrapper object for formatting parameters for Oracle. If the string
representation of the value is large enough (greater than 4000 characters)
the input size needs to be set as CLOB. Alternatively, if the parameter
has an `input_size` attribute, then the value of the `input_size` attribute
will be used instead. Otherwise, no input size will be set for the
parameter when executing the query.
"""
def __init__(self, param, cursor, strings_only=False):
# With raw SQL queries, datetimes can reach this function
# without being converted by DateTimeField.get_db_prep_value.
if settings.USE_TZ and (isinstance(param, datetime.datetime) and
not isinstance(param, Oracle_datetime)):
param = Oracle_datetime.from_datetime(param)
string_size = 0
# Oracle doesn't recognize True and False correctly.
if param is True:
param = 1
elif param is False:
param = 0
if hasattr(param, 'bind_parameter'):
self.force_bytes = param.bind_parameter(cursor)
elif isinstance(param, (Database.Binary, datetime.timedelta)):
self.force_bytes = param
else:
# To transmit to the database, we need Unicode if supported
# To get size right, we must consider bytes.
self.force_bytes = force_str(param, cursor.charset, strings_only)
if isinstance(self.force_bytes, str):
# We could optimize by only converting up to 4000 bytes here
string_size = len(force_bytes(param, cursor.charset, strings_only))
if hasattr(param, 'input_size'):
# If parameter has `input_size` attribute, use that.
self.input_size = param.input_size
elif string_size > 4000:
# Mark any string param greater than 4000 characters as a CLOB.
self.input_size = Database.CLOB
elif isinstance(param, datetime.datetime):
self.input_size = Database.TIMESTAMP
else:
self.input_size = None
class VariableWrapper:
"""
An adapter class for cursor variables that prevents the wrapped object
from being converted into a string when used to instantiate an OracleParam.
This can be used generally for any other object that should be passed into
Cursor.execute as-is.
"""
def __init__(self, var):
self.var = var
def bind_parameter(self, cursor):
return self.var
def __getattr__(self, key):
return getattr(self.var, key)
def __setattr__(self, key, value):
if key == 'var':
self.__dict__[key] = value
else:
setattr(self.var, key, value)
class FormatStylePlaceholderCursor:
"""
Django uses "format" (e.g. '%s') style placeholders, but Oracle uses ":var"
style. This fixes it -- but note that if you want to use a literal "%s" in
a query, you'll need to use "%%s".
"""
charset = 'utf-8'
def __init__(self, connection):
self.cursor = connection.cursor()
self.cursor.outputtypehandler = self._output_type_handler
@staticmethod
def _output_number_converter(value):
return decimal.Decimal(value) if '.' in value else int(value)
@staticmethod
def _get_decimal_converter(precision, scale):
if scale == 0:
return int
context = decimal.Context(prec=precision)
quantize_value = decimal.Decimal(1).scaleb(-scale)
return lambda v: decimal.Decimal(v).quantize(quantize_value, context=context)
@staticmethod
def _output_type_handler(cursor, name, defaultType, length, precision, scale):
"""
Called for each db column fetched from cursors. Return numbers as the
appropriate Python type.
"""
if defaultType == Database.NUMBER:
if scale == -127:
if precision == 0:
# NUMBER column: decimal-precision floating point.
# This will normally be an integer from a sequence,
# but it could be a decimal value.
outconverter = FormatStylePlaceholderCursor._output_number_converter
else:
# FLOAT column: binary-precision floating point.
# This comes from FloatField columns.
outconverter = float
elif precision > 0:
# NUMBER(p,s) column: decimal-precision fixed point.
# This comes from IntegerField and DecimalField columns.
outconverter = FormatStylePlaceholderCursor._get_decimal_converter(precision, scale)
else:
# No type information. This normally comes from a
# mathematical expression in the SELECT list. Guess int
# or Decimal based on whether it has a decimal point.
outconverter = FormatStylePlaceholderCursor._output_number_converter
return cursor.var(
Database.STRING,
size=255,
arraysize=cursor.arraysize,
outconverter=outconverter,
)
def _format_params(self, params):
try:
return {k: OracleParam(v, self, True) for k, v in params.items()}
except AttributeError:
return tuple(OracleParam(p, self, True) for p in params)
def _guess_input_sizes(self, params_list):
# Try dict handling; if that fails, treat as sequence
if hasattr(params_list[0], 'keys'):
sizes = {}
for params in params_list:
for k, value in params.items():
if value.input_size:
sizes[k] = value.input_size
if sizes:
self.setinputsizes(**sizes)
else:
# It's not a list of dicts; it's a list of sequences
sizes = [None] * len(params_list[0])
for params in params_list:
for i, value in enumerate(params):
if value.input_size:
sizes[i] = value.input_size
if sizes:
self.setinputsizes(*sizes)
def _param_generator(self, params):
# Try dict handling; if that fails, treat as sequence
if hasattr(params, 'items'):
return {k: v.force_bytes for k, v in params.items()}
else:
return [p.force_bytes for p in params]
def _fix_for_params(self, query, params, unify_by_values=False):
# cx_Oracle wants no trailing ';' for SQL statements. For PL/SQL, it
# it does want a trailing ';' but not a trailing '/'. However, these
# characters must be included in the original query in case the query
# is being passed to SQL*Plus.
if query.endswith(';') or query.endswith('/'):
query = query[:-1]
if params is None:
params = []
elif hasattr(params, 'keys'):
# Handle params as dict
args = {k: ":%s" % k for k in params}
query = query % args
elif unify_by_values and params:
# Handle params as a dict with unified query parameters by their
# values. It can be used only in single query execute() because
# executemany() shares the formatted query with each of the params
# list. e.g. for input params = [0.75, 2, 0.75, 'sth', 0.75]
# params_dict = {0.75: ':arg0', 2: ':arg1', 'sth': ':arg2'}
# args = [':arg0', ':arg1', ':arg0', ':arg2', ':arg0']
# params = {':arg0': 0.75, ':arg1': 2, ':arg2': 'sth'}
params_dict = {param: ':arg%d' % i for i, param in enumerate(set(params))}
args = [params_dict[param] for param in params]
params = {value: key for key, value in params_dict.items()}
query = query % tuple(args)
else:
# Handle params as sequence
args = [(':arg%d' % i) for i in range(len(params))]
query = query % tuple(args)
return query, self._format_params(params)
def execute(self, query, params=None):
query, params = self._fix_for_params(query, params, unify_by_values=True)
self._guess_input_sizes([params])
with wrap_oracle_errors():
return self.cursor.execute(query, self._param_generator(params))
def executemany(self, query, params=None):
if not params:
# No params given, nothing to do
return None
# uniform treatment for sequences and iterables
params_iter = iter(params)
query, firstparams = self._fix_for_params(query, next(params_iter))
# we build a list of formatted params; as we're going to traverse it
# more than once, we can't make it lazy by using a generator
formatted = [firstparams] + [self._format_params(p) for p in params_iter]
self._guess_input_sizes(formatted)
with wrap_oracle_errors():
return self.cursor.executemany(query, [self._param_generator(p) for p in formatted])
def close(self):
try:
self.cursor.close()
except Database.InterfaceError:
# already closed
pass
def var(self, *args):
return VariableWrapper(self.cursor.var(*args))
def arrayvar(self, *args):
return VariableWrapper(self.cursor.arrayvar(*args))
def __getattr__(self, attr):
return getattr(self.cursor, attr)
def __iter__(self):
return iter(self.cursor)
|
a18d5d9a821e2e1aa97068b0c9f30b60f2de0b3cd666d0746eeeab37d1a037ef | import datetime
import uuid
from functools import lru_cache
from django.conf import settings
from django.db import DatabaseError
from django.db.backends.base.operations import BaseDatabaseOperations
from django.db.backends.utils import strip_quotes, truncate_name
from django.db.models import AutoField, Exists, ExpressionWrapper
from django.db.models.expressions import RawSQL
from django.db.models.sql.where import WhereNode
from django.utils import timezone
from django.utils.encoding import force_bytes, force_str
from django.utils.functional import cached_property
from django.utils.regex_helper import _lazy_re_compile
from .base import Database
from .utils import BulkInsertMapper, InsertVar, Oracle_datetime
class DatabaseOperations(BaseDatabaseOperations):
# Oracle uses NUMBER(5), NUMBER(11), and NUMBER(19) for integer fields.
# SmallIntegerField uses NUMBER(11) instead of NUMBER(5), which is used by
# SmallAutoField, to preserve backward compatibility.
integer_field_ranges = {
'SmallIntegerField': (-99999999999, 99999999999),
'IntegerField': (-99999999999, 99999999999),
'BigIntegerField': (-9999999999999999999, 9999999999999999999),
'PositiveBigIntegerField': (0, 9999999999999999999),
'PositiveSmallIntegerField': (0, 99999999999),
'PositiveIntegerField': (0, 99999999999),
'SmallAutoField': (-99999, 99999),
'AutoField': (-99999999999, 99999999999),
'BigAutoField': (-9999999999999999999, 9999999999999999999),
}
set_operators = {**BaseDatabaseOperations.set_operators, 'difference': 'MINUS'}
# TODO: colorize this SQL code with style.SQL_KEYWORD(), etc.
_sequence_reset_sql = """
DECLARE
table_value integer;
seq_value integer;
seq_name user_tab_identity_cols.sequence_name%%TYPE;
BEGIN
BEGIN
SELECT sequence_name INTO seq_name FROM user_tab_identity_cols
WHERE table_name = '%(table_name)s' AND
column_name = '%(column_name)s';
EXCEPTION WHEN NO_DATA_FOUND THEN
seq_name := '%(no_autofield_sequence_name)s';
END;
SELECT NVL(MAX(%(column)s), 0) INTO table_value FROM %(table)s;
SELECT NVL(last_number - cache_size, 0) INTO seq_value FROM user_sequences
WHERE sequence_name = seq_name;
WHILE table_value > seq_value LOOP
EXECUTE IMMEDIATE 'SELECT "'||seq_name||'".nextval FROM DUAL'
INTO seq_value;
END LOOP;
END;
/"""
# Oracle doesn't support string without precision; use the max string size.
cast_char_field_without_max_length = 'NVARCHAR2(2000)'
cast_data_types = {
'AutoField': 'NUMBER(11)',
'BigAutoField': 'NUMBER(19)',
'SmallAutoField': 'NUMBER(5)',
'TextField': cast_char_field_without_max_length,
}
def cache_key_culling_sql(self):
return 'SELECT cache_key FROM %s ORDER BY cache_key OFFSET %%s ROWS FETCH FIRST 1 ROWS ONLY'
def date_extract_sql(self, lookup_type, field_name):
if lookup_type == 'week_day':
# TO_CHAR(field, 'D') returns an integer from 1-7, where 1=Sunday.
return "TO_CHAR(%s, 'D')" % field_name
elif lookup_type == 'iso_week_day':
return "TO_CHAR(%s - 1, 'D')" % field_name
elif lookup_type == 'week':
# IW = ISO week number
return "TO_CHAR(%s, 'IW')" % field_name
elif lookup_type == 'quarter':
return "TO_CHAR(%s, 'Q')" % field_name
elif lookup_type == 'iso_year':
return "TO_CHAR(%s, 'IYYY')" % field_name
else:
# https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/EXTRACT-datetime.html
return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name)
def date_trunc_sql(self, lookup_type, field_name):
# https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/ROUND-and-TRUNC-Date-Functions.html
if lookup_type in ('year', 'month'):
return "TRUNC(%s, '%s')" % (field_name, lookup_type.upper())
elif lookup_type == 'quarter':
return "TRUNC(%s, 'Q')" % field_name
elif lookup_type == 'week':
return "TRUNC(%s, 'IW')" % field_name
else:
return "TRUNC(%s)" % field_name
# Oracle crashes with "ORA-03113: end-of-file on communication channel"
# if the time zone name is passed in parameter. Use interpolation instead.
# https://groups.google.com/forum/#!msg/django-developers/zwQju7hbG78/9l934yelwfsJ
# This regexp matches all time zone names from the zoneinfo database.
_tzname_re = _lazy_re_compile(r'^[\w/:+-]+$')
def _prepare_tzname_delta(self, tzname):
if '+' in tzname:
return tzname[tzname.find('+'):]
elif '-' in tzname:
return tzname[tzname.find('-'):]
return tzname
def _convert_field_to_tz(self, field_name, tzname):
if not settings.USE_TZ:
return field_name
if not self._tzname_re.match(tzname):
raise ValueError("Invalid time zone name: %s" % tzname)
# Convert from connection timezone to the local time, returning
# TIMESTAMP WITH TIME ZONE and cast it back to TIMESTAMP to strip the
# TIME ZONE details.
if self.connection.timezone_name != tzname:
return "CAST((FROM_TZ(%s, '%s') AT TIME ZONE '%s') AS TIMESTAMP)" % (
field_name,
self.connection.timezone_name,
self._prepare_tzname_delta(tzname),
)
return field_name
def datetime_cast_date_sql(self, field_name, tzname):
field_name = self._convert_field_to_tz(field_name, tzname)
return 'TRUNC(%s)' % field_name
def datetime_cast_time_sql(self, field_name, tzname):
# Since `TimeField` values are stored as TIMESTAMP where only the date
# part is ignored, convert the field to the specified timezone.
return self._convert_field_to_tz(field_name, tzname)
def datetime_extract_sql(self, lookup_type, field_name, tzname):
field_name = self._convert_field_to_tz(field_name, tzname)
return self.date_extract_sql(lookup_type, field_name)
def datetime_trunc_sql(self, lookup_type, field_name, tzname):
field_name = self._convert_field_to_tz(field_name, tzname)
# https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/ROUND-and-TRUNC-Date-Functions.html
if lookup_type in ('year', 'month'):
sql = "TRUNC(%s, '%s')" % (field_name, lookup_type.upper())
elif lookup_type == 'quarter':
sql = "TRUNC(%s, 'Q')" % field_name
elif lookup_type == 'week':
sql = "TRUNC(%s, 'IW')" % field_name
elif lookup_type == 'day':
sql = "TRUNC(%s)" % field_name
elif lookup_type == 'hour':
sql = "TRUNC(%s, 'HH24')" % field_name
elif lookup_type == 'minute':
sql = "TRUNC(%s, 'MI')" % field_name
else:
sql = "CAST(%s AS DATE)" % field_name # Cast to DATE removes sub-second precision.
return sql
def time_trunc_sql(self, lookup_type, field_name):
# The implementation is similar to `datetime_trunc_sql` as both
# `DateTimeField` and `TimeField` are stored as TIMESTAMP where
# the date part of the later is ignored.
if lookup_type == 'hour':
sql = "TRUNC(%s, 'HH24')" % field_name
elif lookup_type == 'minute':
sql = "TRUNC(%s, 'MI')" % field_name
elif lookup_type == 'second':
sql = "CAST(%s AS DATE)" % field_name # Cast to DATE removes sub-second precision.
return sql
def get_db_converters(self, expression):
converters = super().get_db_converters(expression)
internal_type = expression.output_field.get_internal_type()
if internal_type == 'TextField':
converters.append(self.convert_textfield_value)
elif internal_type == 'BinaryField':
converters.append(self.convert_binaryfield_value)
elif internal_type in ['BooleanField', 'NullBooleanField']:
converters.append(self.convert_booleanfield_value)
elif internal_type == 'DateTimeField':
if settings.USE_TZ:
converters.append(self.convert_datetimefield_value)
elif internal_type == 'DateField':
converters.append(self.convert_datefield_value)
elif internal_type == 'TimeField':
converters.append(self.convert_timefield_value)
elif internal_type == 'UUIDField':
converters.append(self.convert_uuidfield_value)
# Oracle stores empty strings as null. If the field accepts the empty
# string, undo this to adhere to the Django convention of using
# the empty string instead of null.
if expression.field.empty_strings_allowed:
converters.append(
self.convert_empty_bytes
if internal_type == 'BinaryField' else
self.convert_empty_string
)
return converters
def convert_textfield_value(self, value, expression, connection):
if isinstance(value, Database.LOB):
value = value.read()
return value
def convert_binaryfield_value(self, value, expression, connection):
if isinstance(value, Database.LOB):
value = force_bytes(value.read())
return value
def convert_booleanfield_value(self, value, expression, connection):
if value in (0, 1):
value = bool(value)
return value
# cx_Oracle always returns datetime.datetime objects for
# DATE and TIMESTAMP columns, but Django wants to see a
# python datetime.date, .time, or .datetime.
def convert_datetimefield_value(self, value, expression, connection):
if value is not None:
value = timezone.make_aware(value, self.connection.timezone)
return value
def convert_datefield_value(self, value, expression, connection):
if isinstance(value, Database.Timestamp):
value = value.date()
return value
def convert_timefield_value(self, value, expression, connection):
if isinstance(value, Database.Timestamp):
value = value.time()
return value
def convert_uuidfield_value(self, value, expression, connection):
if value is not None:
value = uuid.UUID(value)
return value
@staticmethod
def convert_empty_string(value, expression, connection):
return '' if value is None else value
@staticmethod
def convert_empty_bytes(value, expression, connection):
return b'' if value is None else value
def deferrable_sql(self):
return " DEFERRABLE INITIALLY DEFERRED"
def fetch_returned_insert_columns(self, cursor, returning_params):
for param in returning_params:
value = param.get_value()
if value is None or value == []:
# cx_Oracle < 6.3 returns None, >= 6.3 returns empty list.
raise DatabaseError(
'The database did not return a new row id. Probably '
'"ORA-1403: no data found" was raised internally but was '
'hidden by the Oracle OCI library (see '
'https://code.djangoproject.com/ticket/28859).'
)
# cx_Oracle < 7 returns value, >= 7 returns list with single value.
yield value[0] if isinstance(value, list) else value
def field_cast_sql(self, db_type, internal_type):
if db_type and db_type.endswith('LOB'):
return "DBMS_LOB.SUBSTR(%s)"
else:
return "%s"
def no_limit_value(self):
return None
def limit_offset_sql(self, low_mark, high_mark):
fetch, offset = self._get_limit_offset_params(low_mark, high_mark)
return ' '.join(sql for sql in (
('OFFSET %d ROWS' % offset) if offset else None,
('FETCH FIRST %d ROWS ONLY' % fetch) if fetch else None,
) if sql)
def last_executed_query(self, cursor, sql, params):
# https://cx-oracle.readthedocs.io/en/latest/cursor.html#Cursor.statement
# The DB API definition does not define this attribute.
statement = cursor.statement
# Unlike Psycopg's `query` and MySQLdb`'s `_executed`, cx_Oracle's
# `statement` doesn't contain the query parameters. Substitute
# parameters manually.
if isinstance(params, (tuple, list)):
for i, param in enumerate(params):
statement = statement.replace(':arg%d' % i, force_str(param, errors='replace'))
elif isinstance(params, dict):
for key, param in params.items():
statement = statement.replace(':%s' % key, force_str(param, errors='replace'))
return statement
def last_insert_id(self, cursor, table_name, pk_name):
sq_name = self._get_sequence_name(cursor, strip_quotes(table_name), pk_name)
cursor.execute('"%s".currval' % sq_name)
return cursor.fetchone()[0]
def lookup_cast(self, lookup_type, internal_type=None):
if lookup_type in ('iexact', 'icontains', 'istartswith', 'iendswith'):
return "UPPER(%s)"
return "%s"
def max_in_list_size(self):
return 1000
def max_name_length(self):
return 30
def pk_default_value(self):
return "NULL"
def prep_for_iexact_query(self, x):
return x
def process_clob(self, value):
if value is None:
return ''
return value.read()
def quote_name(self, name):
# SQL92 requires delimited (quoted) names to be case-sensitive. When
# not quoted, Oracle has case-insensitive behavior for identifiers, but
# always defaults to uppercase.
# We simplify things by making Oracle identifiers always uppercase.
if not name.startswith('"') and not name.endswith('"'):
name = '"%s"' % truncate_name(name.upper(), self.max_name_length())
# Oracle puts the query text into a (query % args) construct, so % signs
# in names need to be escaped. The '%%' will be collapsed back to '%' at
# that stage so we aren't really making the name longer here.
name = name.replace('%', '%%')
return name.upper()
def random_function_sql(self):
return "DBMS_RANDOM.RANDOM"
def regex_lookup(self, lookup_type):
if lookup_type == 'regex':
match_option = "'c'"
else:
match_option = "'i'"
return 'REGEXP_LIKE(%%s, %%s, %s)' % match_option
def return_insert_columns(self, fields):
if not fields:
return '', ()
field_names = []
params = []
for field in fields:
field_names.append('%s.%s' % (
self.quote_name(field.model._meta.db_table),
self.quote_name(field.column),
))
params.append(InsertVar(field))
return 'RETURNING %s INTO %s' % (
', '.join(field_names),
', '.join(['%s'] * len(params)),
), tuple(params)
def __foreign_key_constraints(self, table_name, recursive):
with self.connection.cursor() as cursor:
if recursive:
cursor.execute("""
SELECT
user_tables.table_name, rcons.constraint_name
FROM
user_tables
JOIN
user_constraints cons
ON (user_tables.table_name = cons.table_name AND cons.constraint_type = ANY('P', 'U'))
LEFT JOIN
user_constraints rcons
ON (user_tables.table_name = rcons.table_name AND rcons.constraint_type = 'R')
START WITH user_tables.table_name = UPPER(%s)
CONNECT BY NOCYCLE PRIOR cons.constraint_name = rcons.r_constraint_name
GROUP BY
user_tables.table_name, rcons.constraint_name
HAVING user_tables.table_name != UPPER(%s)
ORDER BY MAX(level) DESC
""", (table_name, table_name))
else:
cursor.execute("""
SELECT
cons.table_name, cons.constraint_name
FROM
user_constraints cons
WHERE
cons.constraint_type = 'R'
AND cons.table_name = UPPER(%s)
""", (table_name,))
return cursor.fetchall()
@cached_property
def _foreign_key_constraints(self):
# 512 is large enough to fit the ~330 tables (as of this writing) in
# Django's test suite.
return lru_cache(maxsize=512)(self.__foreign_key_constraints)
def sql_flush(self, style, tables, sequences, allow_cascade=False):
if tables:
truncated_tables = {table.upper() for table in tables}
constraints = set()
# Oracle's TRUNCATE CASCADE only works with ON DELETE CASCADE
# foreign keys which Django doesn't define. Emulate the
# PostgreSQL behavior which truncates all dependent tables by
# manually retrieving all foreign key constraints and resolving
# dependencies.
for table in tables:
for foreign_table, constraint in self._foreign_key_constraints(table, recursive=allow_cascade):
if allow_cascade:
truncated_tables.add(foreign_table)
constraints.add((foreign_table, constraint))
sql = [
"%s %s %s %s %s %s %s %s;" % (
style.SQL_KEYWORD('ALTER'),
style.SQL_KEYWORD('TABLE'),
style.SQL_FIELD(self.quote_name(table)),
style.SQL_KEYWORD('DISABLE'),
style.SQL_KEYWORD('CONSTRAINT'),
style.SQL_FIELD(self.quote_name(constraint)),
style.SQL_KEYWORD('KEEP'),
style.SQL_KEYWORD('INDEX'),
) for table, constraint in constraints
] + [
"%s %s %s;" % (
style.SQL_KEYWORD('TRUNCATE'),
style.SQL_KEYWORD('TABLE'),
style.SQL_FIELD(self.quote_name(table)),
) for table in truncated_tables
] + [
"%s %s %s %s %s %s;" % (
style.SQL_KEYWORD('ALTER'),
style.SQL_KEYWORD('TABLE'),
style.SQL_FIELD(self.quote_name(table)),
style.SQL_KEYWORD('ENABLE'),
style.SQL_KEYWORD('CONSTRAINT'),
style.SQL_FIELD(self.quote_name(constraint)),
) for table, constraint in constraints
]
# Since we've just deleted all the rows, running our sequence
# ALTER code will reset the sequence to 0.
sql.extend(self.sequence_reset_by_name_sql(style, sequences))
return sql
else:
return []
def sequence_reset_by_name_sql(self, style, sequences):
sql = []
for sequence_info in sequences:
no_autofield_sequence_name = self._get_no_autofield_sequence_name(sequence_info['table'])
table = self.quote_name(sequence_info['table'])
column = self.quote_name(sequence_info['column'] or 'id')
query = self._sequence_reset_sql % {
'no_autofield_sequence_name': no_autofield_sequence_name,
'table': table,
'column': column,
'table_name': strip_quotes(table),
'column_name': strip_quotes(column),
}
sql.append(query)
return sql
def sequence_reset_sql(self, style, model_list):
output = []
query = self._sequence_reset_sql
for model in model_list:
for f in model._meta.local_fields:
if isinstance(f, AutoField):
no_autofield_sequence_name = self._get_no_autofield_sequence_name(model._meta.db_table)
table = self.quote_name(model._meta.db_table)
column = self.quote_name(f.column)
output.append(query % {
'no_autofield_sequence_name': no_autofield_sequence_name,
'table': table,
'column': column,
'table_name': strip_quotes(table),
'column_name': strip_quotes(column),
})
# Only one AutoField is allowed per model, so don't
# continue to loop
break
for f in model._meta.many_to_many:
if not f.remote_field.through:
no_autofield_sequence_name = self._get_no_autofield_sequence_name(f.m2m_db_table())
table = self.quote_name(f.m2m_db_table())
column = self.quote_name('id')
output.append(query % {
'no_autofield_sequence_name': no_autofield_sequence_name,
'table': table,
'column': column,
'table_name': strip_quotes(table),
'column_name': 'ID',
})
return output
def start_transaction_sql(self):
return ''
def tablespace_sql(self, tablespace, inline=False):
if inline:
return "USING INDEX TABLESPACE %s" % self.quote_name(tablespace)
else:
return "TABLESPACE %s" % self.quote_name(tablespace)
def adapt_datefield_value(self, value):
"""
Transform a date value to an object compatible with what is expected
by the backend driver for date columns.
The default implementation transforms the date to text, but that is not
necessary for Oracle.
"""
return value
def adapt_datetimefield_value(self, value):
"""
Transform a datetime value to an object compatible with what is expected
by the backend driver for datetime columns.
If naive datetime is passed assumes that is in UTC. Normally Django
models.DateTimeField makes sure that if USE_TZ is True passed datetime
is timezone aware.
"""
if value is None:
return None
# Expression values are adapted by the database.
if hasattr(value, 'resolve_expression'):
return value
# cx_Oracle doesn't support tz-aware datetimes
if timezone.is_aware(value):
if settings.USE_TZ:
value = timezone.make_naive(value, self.connection.timezone)
else:
raise ValueError("Oracle backend does not support timezone-aware datetimes when USE_TZ is False.")
return Oracle_datetime.from_datetime(value)
def adapt_timefield_value(self, value):
if value is None:
return None
# Expression values are adapted by the database.
if hasattr(value, 'resolve_expression'):
return value
if isinstance(value, str):
return datetime.datetime.strptime(value, '%H:%M:%S')
# Oracle doesn't support tz-aware times
if timezone.is_aware(value):
raise ValueError("Oracle backend does not support timezone-aware times.")
return Oracle_datetime(1900, 1, 1, value.hour, value.minute,
value.second, value.microsecond)
def combine_expression(self, connector, sub_expressions):
lhs, rhs = sub_expressions
if connector == '%%':
return 'MOD(%s)' % ','.join(sub_expressions)
elif connector == '&':
return 'BITAND(%s)' % ','.join(sub_expressions)
elif connector == '|':
return 'BITAND(-%(lhs)s-1,%(rhs)s)+%(lhs)s' % {'lhs': lhs, 'rhs': rhs}
elif connector == '<<':
return '(%(lhs)s * POWER(2, %(rhs)s))' % {'lhs': lhs, 'rhs': rhs}
elif connector == '>>':
return 'FLOOR(%(lhs)s / POWER(2, %(rhs)s))' % {'lhs': lhs, 'rhs': rhs}
elif connector == '^':
return 'POWER(%s)' % ','.join(sub_expressions)
return super().combine_expression(connector, sub_expressions)
def _get_no_autofield_sequence_name(self, table):
"""
Manually created sequence name to keep backward compatibility for
AutoFields that aren't Oracle identity columns.
"""
name_length = self.max_name_length() - 3
return '%s_SQ' % truncate_name(strip_quotes(table), name_length).upper()
def _get_sequence_name(self, cursor, table, pk_name):
cursor.execute("""
SELECT sequence_name
FROM user_tab_identity_cols
WHERE table_name = UPPER(%s)
AND column_name = UPPER(%s)""", [table, pk_name])
row = cursor.fetchone()
return self._get_no_autofield_sequence_name(table) if row is None else row[0]
def bulk_insert_sql(self, fields, placeholder_rows):
query = []
for row in placeholder_rows:
select = []
for i, placeholder in enumerate(row):
# A model without any fields has fields=[None].
if fields[i]:
internal_type = getattr(fields[i], 'target_field', fields[i]).get_internal_type()
placeholder = BulkInsertMapper.types.get(internal_type, '%s') % placeholder
# Add columns aliases to the first select to avoid "ORA-00918:
# column ambiguously defined" when two or more columns in the
# first select have the same value.
if not query:
placeholder = '%s col_%s' % (placeholder, i)
select.append(placeholder)
query.append('SELECT %s FROM DUAL' % ', '.join(select))
# Bulk insert to tables with Oracle identity columns causes Oracle to
# add sequence.nextval to it. Sequence.nextval cannot be used with the
# UNION operator. To prevent incorrect SQL, move UNION to a subquery.
return 'SELECT * FROM (%s)' % ' UNION ALL '.join(query)
def subtract_temporals(self, internal_type, lhs, rhs):
if internal_type == 'DateField':
lhs_sql, lhs_params = lhs
rhs_sql, rhs_params = rhs
params = (*lhs_params, *rhs_params)
return "NUMTODSINTERVAL(TO_NUMBER(%s - %s), 'DAY')" % (lhs_sql, rhs_sql), params
return super().subtract_temporals(internal_type, lhs, rhs)
def bulk_batch_size(self, fields, objs):
"""Oracle restricts the number of parameters in a query."""
if fields:
return self.connection.features.max_query_params // len(fields)
return len(objs)
def conditional_expression_supported_in_where_clause(self, expression):
"""
Oracle supports only EXISTS(...) or filters in the WHERE clause, others
must be compared with True.
"""
if isinstance(expression, (Exists, WhereNode)):
return True
if isinstance(expression, ExpressionWrapper) and expression.conditional:
return self.conditional_expression_supported_in_where_clause(expression.expression)
if isinstance(expression, RawSQL) and expression.conditional:
return True
return False
|
d8b4b6e9b5e92f3e3235827585bcb44ef77cd3f68fa3ff64c3ef9bd37b78bb7a | import sys
from django.conf import settings
from django.db import DatabaseError
from django.db.backends.base.creation import BaseDatabaseCreation
from django.utils.crypto import get_random_string
from django.utils.functional import cached_property
TEST_DATABASE_PREFIX = 'test_'
class DatabaseCreation(BaseDatabaseCreation):
@cached_property
def _maindb_connection(self):
"""
This is analogous to other backends' `_nodb_connection` property,
which allows access to an "administrative" connection which can
be used to manage the test databases.
For Oracle, the only connection that can be used for that purpose
is the main (non-test) connection.
"""
settings_dict = settings.DATABASES[self.connection.alias]
user = settings_dict.get('SAVED_USER') or settings_dict['USER']
password = settings_dict.get('SAVED_PASSWORD') or settings_dict['PASSWORD']
settings_dict = {**settings_dict, 'USER': user, 'PASSWORD': password}
DatabaseWrapper = type(self.connection)
return DatabaseWrapper(settings_dict, alias=self.connection.alias)
def _create_test_db(self, verbosity=1, autoclobber=False, keepdb=False):
parameters = self._get_test_db_params()
with self._maindb_connection.cursor() as cursor:
if self._test_database_create():
try:
self._execute_test_db_creation(cursor, parameters, verbosity, keepdb)
except Exception as e:
if 'ORA-01543' not in str(e):
# All errors except "tablespace already exists" cancel tests
self.log('Got an error creating the test database: %s' % e)
sys.exit(2)
if not autoclobber:
confirm = input(
"It appears the test database, %s, already exists. "
"Type 'yes' to delete it, or 'no' to cancel: " % parameters['user'])
if autoclobber or confirm == 'yes':
if verbosity >= 1:
self.log("Destroying old test database for alias '%s'..." % self.connection.alias)
try:
self._execute_test_db_destruction(cursor, parameters, verbosity)
except DatabaseError as e:
if 'ORA-29857' in str(e):
self._handle_objects_preventing_db_destruction(cursor, parameters,
verbosity, autoclobber)
else:
# Ran into a database error that isn't about leftover objects in the tablespace
self.log('Got an error destroying the old test database: %s' % e)
sys.exit(2)
except Exception as e:
self.log('Got an error destroying the old test database: %s' % e)
sys.exit(2)
try:
self._execute_test_db_creation(cursor, parameters, verbosity, keepdb)
except Exception as e:
self.log('Got an error recreating the test database: %s' % e)
sys.exit(2)
else:
self.log('Tests cancelled.')
sys.exit(1)
if self._test_user_create():
if verbosity >= 1:
self.log('Creating test user...')
try:
self._create_test_user(cursor, parameters, verbosity, keepdb)
except Exception as e:
if 'ORA-01920' not in str(e):
# All errors except "user already exists" cancel tests
self.log('Got an error creating the test user: %s' % e)
sys.exit(2)
if not autoclobber:
confirm = input(
"It appears the test user, %s, already exists. Type "
"'yes' to delete it, or 'no' to cancel: " % parameters['user'])
if autoclobber or confirm == 'yes':
try:
if verbosity >= 1:
self.log('Destroying old test user...')
self._destroy_test_user(cursor, parameters, verbosity)
if verbosity >= 1:
self.log('Creating test user...')
self._create_test_user(cursor, parameters, verbosity, keepdb)
except Exception as e:
self.log('Got an error recreating the test user: %s' % e)
sys.exit(2)
else:
self.log('Tests cancelled.')
sys.exit(1)
self._maindb_connection.close() # done with main user -- test user and tablespaces created
self._switch_to_test_user(parameters)
return self.connection.settings_dict['NAME']
def _switch_to_test_user(self, parameters):
"""
Switch to the user that's used for creating the test database.
Oracle doesn't have the concept of separate databases under the same
user, so a separate user is used; see _create_test_db(). The main user
is also needed for cleanup when testing is completed, so save its
credentials in the SAVED_USER/SAVED_PASSWORD key in the settings dict.
"""
real_settings = settings.DATABASES[self.connection.alias]
real_settings['SAVED_USER'] = self.connection.settings_dict['SAVED_USER'] = \
self.connection.settings_dict['USER']
real_settings['SAVED_PASSWORD'] = self.connection.settings_dict['SAVED_PASSWORD'] = \
self.connection.settings_dict['PASSWORD']
real_test_settings = real_settings['TEST']
test_settings = self.connection.settings_dict['TEST']
real_test_settings['USER'] = real_settings['USER'] = test_settings['USER'] = \
self.connection.settings_dict['USER'] = parameters['user']
real_settings['PASSWORD'] = self.connection.settings_dict['PASSWORD'] = parameters['password']
def set_as_test_mirror(self, primary_settings_dict):
"""
Set this database up to be used in testing as a mirror of a primary
database whose settings are given.
"""
self.connection.settings_dict['USER'] = primary_settings_dict['USER']
self.connection.settings_dict['PASSWORD'] = primary_settings_dict['PASSWORD']
def _handle_objects_preventing_db_destruction(self, cursor, parameters, verbosity, autoclobber):
# There are objects in the test tablespace which prevent dropping it
# The easy fix is to drop the test user -- but are we allowed to do so?
self.log(
'There are objects in the old test database which prevent its destruction.\n'
'If they belong to the test user, deleting the user will allow the test '
'database to be recreated.\n'
'Otherwise, you will need to find and remove each of these objects, '
'or use a different tablespace.\n'
)
if self._test_user_create():
if not autoclobber:
confirm = input("Type 'yes' to delete user %s: " % parameters['user'])
if autoclobber or confirm == 'yes':
try:
if verbosity >= 1:
self.log('Destroying old test user...')
self._destroy_test_user(cursor, parameters, verbosity)
except Exception as e:
self.log('Got an error destroying the test user: %s' % e)
sys.exit(2)
try:
if verbosity >= 1:
self.log("Destroying old test database for alias '%s'..." % self.connection.alias)
self._execute_test_db_destruction(cursor, parameters, verbosity)
except Exception as e:
self.log('Got an error destroying the test database: %s' % e)
sys.exit(2)
else:
self.log('Tests cancelled -- test database cannot be recreated.')
sys.exit(1)
else:
self.log("Django is configured to use pre-existing test user '%s',"
" and will not attempt to delete it." % parameters['user'])
self.log('Tests cancelled -- test database cannot be recreated.')
sys.exit(1)
def _destroy_test_db(self, test_database_name, verbosity=1):
"""
Destroy a test database, prompting the user for confirmation if the
database already exists. Return the name of the test database created.
"""
self.connection.settings_dict['USER'] = self.connection.settings_dict['SAVED_USER']
self.connection.settings_dict['PASSWORD'] = self.connection.settings_dict['SAVED_PASSWORD']
self.connection.close()
parameters = self._get_test_db_params()
with self._maindb_connection.cursor() as cursor:
if self._test_user_create():
if verbosity >= 1:
self.log('Destroying test user...')
self._destroy_test_user(cursor, parameters, verbosity)
if self._test_database_create():
if verbosity >= 1:
self.log('Destroying test database tables...')
self._execute_test_db_destruction(cursor, parameters, verbosity)
self._maindb_connection.close()
def _execute_test_db_creation(self, cursor, parameters, verbosity, keepdb=False):
if verbosity >= 2:
self.log('_create_test_db(): dbname = %s' % parameters['user'])
if self._test_database_oracle_managed_files():
statements = [
"""
CREATE TABLESPACE %(tblspace)s
DATAFILE SIZE %(size)s
AUTOEXTEND ON NEXT %(extsize)s MAXSIZE %(maxsize)s
""",
"""
CREATE TEMPORARY TABLESPACE %(tblspace_temp)s
TEMPFILE SIZE %(size_tmp)s
AUTOEXTEND ON NEXT %(extsize_tmp)s MAXSIZE %(maxsize_tmp)s
""",
]
else:
statements = [
"""
CREATE TABLESPACE %(tblspace)s
DATAFILE '%(datafile)s' SIZE %(size)s REUSE
AUTOEXTEND ON NEXT %(extsize)s MAXSIZE %(maxsize)s
""",
"""
CREATE TEMPORARY TABLESPACE %(tblspace_temp)s
TEMPFILE '%(datafile_tmp)s' SIZE %(size_tmp)s REUSE
AUTOEXTEND ON NEXT %(extsize_tmp)s MAXSIZE %(maxsize_tmp)s
""",
]
# Ignore "tablespace already exists" error when keepdb is on.
acceptable_ora_err = 'ORA-01543' if keepdb else None
self._execute_allow_fail_statements(cursor, statements, parameters, verbosity, acceptable_ora_err)
def _create_test_user(self, cursor, parameters, verbosity, keepdb=False):
if verbosity >= 2:
self.log('_create_test_user(): username = %s' % parameters['user'])
statements = [
"""CREATE USER %(user)s
IDENTIFIED BY "%(password)s"
DEFAULT TABLESPACE %(tblspace)s
TEMPORARY TABLESPACE %(tblspace_temp)s
QUOTA UNLIMITED ON %(tblspace)s
""",
"""GRANT CREATE SESSION,
CREATE TABLE,
CREATE SEQUENCE,
CREATE PROCEDURE,
CREATE TRIGGER
TO %(user)s""",
]
# Ignore "user already exists" error when keepdb is on
acceptable_ora_err = 'ORA-01920' if keepdb else None
success = self._execute_allow_fail_statements(cursor, statements, parameters, verbosity, acceptable_ora_err)
# If the password was randomly generated, change the user accordingly.
if not success and self._test_settings_get('PASSWORD') is None:
set_password = 'ALTER USER %(user)s IDENTIFIED BY "%(password)s"'
self._execute_statements(cursor, [set_password], parameters, verbosity)
# Most test suites can be run without "create view" and
# "create materialized view" privileges. But some need it.
for object_type in ('VIEW', 'MATERIALIZED VIEW'):
extra = 'GRANT CREATE %(object_type)s TO %(user)s'
parameters['object_type'] = object_type
success = self._execute_allow_fail_statements(cursor, [extra], parameters, verbosity, 'ORA-01031')
if not success and verbosity >= 2:
self.log('Failed to grant CREATE %s permission to test user. This may be ok.' % object_type)
def _execute_test_db_destruction(self, cursor, parameters, verbosity):
if verbosity >= 2:
self.log('_execute_test_db_destruction(): dbname=%s' % parameters['user'])
statements = [
'DROP TABLESPACE %(tblspace)s INCLUDING CONTENTS AND DATAFILES CASCADE CONSTRAINTS',
'DROP TABLESPACE %(tblspace_temp)s INCLUDING CONTENTS AND DATAFILES CASCADE CONSTRAINTS',
]
self._execute_statements(cursor, statements, parameters, verbosity)
def _destroy_test_user(self, cursor, parameters, verbosity):
if verbosity >= 2:
self.log('_destroy_test_user(): user=%s' % parameters['user'])
self.log('Be patient. This can take some time...')
statements = [
'DROP USER %(user)s CASCADE',
]
self._execute_statements(cursor, statements, parameters, verbosity)
def _execute_statements(self, cursor, statements, parameters, verbosity, allow_quiet_fail=False):
for template in statements:
stmt = template % parameters
if verbosity >= 2:
print(stmt)
try:
cursor.execute(stmt)
except Exception as err:
if (not allow_quiet_fail) or verbosity >= 2:
self.log('Failed (%s)' % (err))
raise
def _execute_allow_fail_statements(self, cursor, statements, parameters, verbosity, acceptable_ora_err):
"""
Execute statements which are allowed to fail silently if the Oracle
error code given by `acceptable_ora_err` is raised. Return True if the
statements execute without an exception, or False otherwise.
"""
try:
# Statement can fail when acceptable_ora_err is not None
allow_quiet_fail = acceptable_ora_err is not None and len(acceptable_ora_err) > 0
self._execute_statements(cursor, statements, parameters, verbosity, allow_quiet_fail=allow_quiet_fail)
return True
except DatabaseError as err:
description = str(err)
if acceptable_ora_err is None or acceptable_ora_err not in description:
raise
return False
def _get_test_db_params(self):
return {
'dbname': self._test_database_name(),
'user': self._test_database_user(),
'password': self._test_database_passwd(),
'tblspace': self._test_database_tblspace(),
'tblspace_temp': self._test_database_tblspace_tmp(),
'datafile': self._test_database_tblspace_datafile(),
'datafile_tmp': self._test_database_tblspace_tmp_datafile(),
'maxsize': self._test_database_tblspace_maxsize(),
'maxsize_tmp': self._test_database_tblspace_tmp_maxsize(),
'size': self._test_database_tblspace_size(),
'size_tmp': self._test_database_tblspace_tmp_size(),
'extsize': self._test_database_tblspace_extsize(),
'extsize_tmp': self._test_database_tblspace_tmp_extsize(),
}
def _test_settings_get(self, key, default=None, prefixed=None):
"""
Return a value from the test settings dict, or a given default, or a
prefixed entry from the main settings dict.
"""
settings_dict = self.connection.settings_dict
val = settings_dict['TEST'].get(key, default)
if val is None and prefixed:
val = TEST_DATABASE_PREFIX + settings_dict[prefixed]
return val
def _test_database_name(self):
return self._test_settings_get('NAME', prefixed='NAME')
def _test_database_create(self):
return self._test_settings_get('CREATE_DB', default=True)
def _test_user_create(self):
return self._test_settings_get('CREATE_USER', default=True)
def _test_database_user(self):
return self._test_settings_get('USER', prefixed='USER')
def _test_database_passwd(self):
password = self._test_settings_get('PASSWORD')
if password is None and self._test_user_create():
# Oracle passwords are limited to 30 chars and can't contain symbols.
password = get_random_string(length=30)
return password
def _test_database_tblspace(self):
return self._test_settings_get('TBLSPACE', prefixed='USER')
def _test_database_tblspace_tmp(self):
settings_dict = self.connection.settings_dict
return settings_dict['TEST'].get('TBLSPACE_TMP',
TEST_DATABASE_PREFIX + settings_dict['USER'] + '_temp')
def _test_database_tblspace_datafile(self):
tblspace = '%s.dbf' % self._test_database_tblspace()
return self._test_settings_get('DATAFILE', default=tblspace)
def _test_database_tblspace_tmp_datafile(self):
tblspace = '%s.dbf' % self._test_database_tblspace_tmp()
return self._test_settings_get('DATAFILE_TMP', default=tblspace)
def _test_database_tblspace_maxsize(self):
return self._test_settings_get('DATAFILE_MAXSIZE', default='500M')
def _test_database_tblspace_tmp_maxsize(self):
return self._test_settings_get('DATAFILE_TMP_MAXSIZE', default='500M')
def _test_database_tblspace_size(self):
return self._test_settings_get('DATAFILE_SIZE', default='50M')
def _test_database_tblspace_tmp_size(self):
return self._test_settings_get('DATAFILE_TMP_SIZE', default='50M')
def _test_database_tblspace_extsize(self):
return self._test_settings_get('DATAFILE_EXTSIZE', default='25M')
def _test_database_tblspace_tmp_extsize(self):
return self._test_settings_get('DATAFILE_TMP_EXTSIZE', default='25M')
def _test_database_oracle_managed_files(self):
return self._test_settings_get('ORACLE_MANAGED_FILES', default=False)
def _get_test_db_name(self):
"""
Return the 'production' DB name to get the test DB creation machinery
to work. This isn't a great deal in this case because DB names as
handled by Django don't have real counterparts in Oracle.
"""
return self.connection.settings_dict['NAME']
def test_db_signature(self):
settings_dict = self.connection.settings_dict
return (
settings_dict['HOST'],
settings_dict['PORT'],
settings_dict['ENGINE'],
settings_dict['NAME'],
self._test_database_user(),
)
|
df607af77089d9b890bc9658bbe5db439950740231434b0693ab782258be52c7 | from django.db import ProgrammingError
from django.utils.functional import cached_property
class BaseDatabaseFeatures:
gis_enabled = False
allows_group_by_pk = False
allows_group_by_selected_pks = False
empty_fetchmany_value = []
update_can_self_select = True
# Does the backend distinguish between '' and None?
interprets_empty_strings_as_nulls = False
# Does the backend allow inserting duplicate NULL rows in a nullable
# unique field? All core backends implement this correctly, but other
# databases such as SQL Server do not.
supports_nullable_unique_constraints = True
# Does the backend allow inserting duplicate rows when a unique_together
# constraint exists and some fields are nullable but not all of them?
supports_partially_nullable_unique_constraints = True
can_use_chunked_reads = True
can_return_columns_from_insert = False
can_return_rows_from_bulk_insert = False
has_bulk_insert = True
uses_savepoints = True
can_release_savepoints = False
# If True, don't use integer foreign keys referring to, e.g., positive
# integer primary keys.
related_fields_match_type = False
allow_sliced_subqueries_with_in = True
has_select_for_update = False
has_select_for_update_nowait = False
has_select_for_update_skip_locked = False
has_select_for_update_of = False
# Does the database's SELECT FOR UPDATE OF syntax require a column rather
# than a table?
select_for_update_of_column = False
# Does the default test database allow multiple connections?
# Usually an indication that the test database is in-memory
test_db_allows_multiple_connections = True
# Can an object be saved without an explicit primary key?
supports_unspecified_pk = False
# Can a fixture contain forward references? i.e., are
# FK constraints checked at the end of transaction, or
# at the end of each save operation?
supports_forward_references = True
# Does the backend truncate names properly when they are too long?
truncates_names = False
# Is there a REAL datatype in addition to floats/doubles?
has_real_datatype = False
supports_subqueries_in_group_by = True
# Is there a true datatype for uuid?
has_native_uuid_field = False
# Is there a true datatype for timedeltas?
has_native_duration_field = False
# Does the database driver supports same type temporal data subtraction
# by returning the type used to store duration field?
supports_temporal_subtraction = False
# Does the __regex lookup support backreferencing and grouping?
supports_regex_backreferencing = True
# Can date/datetime lookups be performed using a string?
supports_date_lookup_using_string = True
# Can datetimes with timezones be used?
supports_timezones = True
# Does the database have a copy of the zoneinfo database?
has_zoneinfo_database = True
# When performing a GROUP BY, is an ORDER BY NULL required
# to remove any ordering?
requires_explicit_null_ordering_when_grouping = False
# Does the backend order NULL values as largest or smallest?
nulls_order_largest = False
# Does the backend support NULLS FIRST and NULLS LAST in ORDER BY?
supports_order_by_nulls_modifier = True
# The database's limit on the number of query parameters.
max_query_params = None
# Can an object have an autoincrement primary key of 0? MySQL says No.
allows_auto_pk_0 = True
# Do we need to NULL a ForeignKey out, or can the constraint check be
# deferred
can_defer_constraint_checks = False
# date_interval_sql can properly handle mixed Date/DateTime fields and timedeltas
supports_mixed_date_datetime_comparisons = True
# Does the backend support tablespaces? Default to False because it isn't
# in the SQL standard.
supports_tablespaces = False
# Does the backend reset sequences between tests?
supports_sequence_reset = True
# Can the backend introspect the default value of a column?
can_introspect_default = True
# Confirm support for introspected foreign keys
# Every database can do this reliably, except MySQL,
# which can't do it for MyISAM tables
can_introspect_foreign_keys = True
# Can the backend introspect an AutoField, instead of an IntegerField?
can_introspect_autofield = False
# Can the backend introspect a BigIntegerField, instead of an IntegerField?
can_introspect_big_integer_field = True
# Can the backend introspect an BinaryField, instead of an TextField?
can_introspect_binary_field = True
# Can the backend introspect an DecimalField, instead of an FloatField?
can_introspect_decimal_field = True
# Can the backend introspect a DurationField, instead of a BigIntegerField?
can_introspect_duration_field = True
# Can the backend introspect an IPAddressField, instead of an CharField?
can_introspect_ip_address_field = False
# Can the backend introspect a PositiveIntegerField, instead of an IntegerField?
can_introspect_positive_integer_field = False
# Can the backend introspect a SmallIntegerField, instead of an IntegerField?
can_introspect_small_integer_field = False
# Can the backend introspect a TimeField, instead of a DateTimeField?
can_introspect_time_field = True
# Some backends may not be able to differentiate BigAutoField or
# SmallAutoField from other fields such as AutoField.
introspected_big_auto_field_type = 'BigAutoField'
introspected_small_auto_field_type = 'SmallAutoField'
# Some backends may not be able to differentiate BooleanField from other
# fields such as IntegerField.
introspected_boolean_field_type = 'BooleanField'
# Can the backend introspect the column order (ASC/DESC) for indexes?
supports_index_column_ordering = True
# Does the backend support introspection of materialized views?
can_introspect_materialized_views = False
# Support for the DISTINCT ON clause
can_distinct_on_fields = False
# Does the backend prevent running SQL queries in broken transactions?
atomic_transactions = True
# Can we roll back DDL in a transaction?
can_rollback_ddl = False
# Does it support operations requiring references rename in a transaction?
supports_atomic_references_rename = True
# Can we issue more than one ALTER COLUMN clause in an ALTER TABLE?
supports_combined_alters = False
# Does it support foreign keys?
supports_foreign_keys = True
# Can it create foreign key constraints inline when adding columns?
can_create_inline_fk = True
# Does it support CHECK constraints?
supports_column_check_constraints = True
supports_table_check_constraints = True
# Does the backend support introspection of CHECK constraints?
can_introspect_check_constraints = True
# Does the backend support 'pyformat' style ("... %(name)s ...", {'name': value})
# parameter passing? Note this can be provided by the backend even if not
# supported by the Python driver
supports_paramstyle_pyformat = True
# Does the backend require literal defaults, rather than parameterized ones?
requires_literal_defaults = False
# Does the backend require a connection reset after each material schema change?
connection_persists_old_columns = False
# What kind of error does the backend throw when accessing closed cursor?
closed_cursor_error_class = ProgrammingError
# Does 'a' LIKE 'A' match?
has_case_insensitive_like = True
# Suffix for backends that don't support "SELECT xxx;" queries.
bare_select_suffix = ''
# If NULL is implied on columns without needing to be explicitly specified
implied_column_null = False
# Does the backend support "select for update" queries with limit (and offset)?
supports_select_for_update_with_limit = True
# Does the backend ignore null expressions in GREATEST and LEAST queries unless
# every expression is null?
greatest_least_ignores_nulls = False
# Can the backend clone databases for parallel test execution?
# Defaults to False to allow third-party backends to opt-in.
can_clone_databases = False
# Does the backend consider table names with different casing to
# be equal?
ignores_table_name_case = False
# Place FOR UPDATE right after FROM clause. Used on MSSQL.
for_update_after_from = False
# Combinatorial flags
supports_select_union = True
supports_select_intersection = True
supports_select_difference = True
supports_slicing_ordering_in_compound = False
supports_parentheses_in_compound = True
# Does the database support SQL 2003 FILTER (WHERE ...) in aggregate
# expressions?
supports_aggregate_filter_clause = False
# Does the backend support indexing a TextField?
supports_index_on_text_field = True
# Does the backend support window expressions (expression OVER (...))?
supports_over_clause = False
supports_frame_range_fixed_distance = False
only_supports_unbounded_with_preceding_and_following = False
# Does the backend support CAST with precision?
supports_cast_with_precision = True
# How many second decimals does the database return when casting a value to
# a type with time?
time_cast_precision = 6
# SQL to create a procedure for use by the Django test suite. The
# functionality of the procedure isn't important.
create_test_procedure_without_params_sql = None
create_test_procedure_with_int_param_sql = None
# Does the backend support keyword parameters for cursor.callproc()?
supports_callproc_kwargs = False
# Convert CharField results from bytes to str in database functions.
db_functions_convert_bytes_to_str = False
# What formats does the backend EXPLAIN syntax support?
supported_explain_formats = set()
# Does DatabaseOperations.explain_query_prefix() raise ValueError if
# unknown kwargs are passed to QuerySet.explain()?
validates_explain_options = True
# Does the backend support the default parameter in lead() and lag()?
supports_default_in_lead_lag = True
# Does the backend support ignoring constraint or uniqueness errors during
# INSERT?
supports_ignore_conflicts = True
# Does this backend require casting the results of CASE expressions used
# in UPDATE statements to ensure the expression has the correct type?
requires_casted_case_in_updates = False
# Does the backend support partial indexes (CREATE INDEX ... WHERE ...)?
supports_partial_indexes = True
supports_functions_in_partial_indexes = True
# Does the database allow more than one constraint or index on the same
# field(s)?
allows_multiple_constraints_on_same_fields = True
# Does the backend support boolean expressions in the SELECT clause?
supports_boolean_expr_in_select_clause = True
def __init__(self, connection):
self.connection = connection
@cached_property
def supports_explaining_query_execution(self):
"""Does this backend support explaining query execution?"""
return self.connection.ops.explain_prefix is not None
@cached_property
def supports_transactions(self):
"""Confirm support for transactions."""
with self.connection.cursor() as cursor:
cursor.execute('CREATE TABLE ROLLBACK_TEST (X INT)')
self.connection.set_autocommit(False)
cursor.execute('INSERT INTO ROLLBACK_TEST (X) VALUES (8)')
self.connection.rollback()
self.connection.set_autocommit(True)
cursor.execute('SELECT COUNT(X) FROM ROLLBACK_TEST')
count, = cursor.fetchone()
cursor.execute('DROP TABLE ROLLBACK_TEST')
return count == 0
def allows_group_by_selected_pks_on_model(self, model):
if not self.allows_group_by_selected_pks:
return False
return model._meta.managed
|
79d432035129bee0aebe054862036dc31b55266c843d00f902186330649fb382 | import copy
import threading
import time
import warnings
from collections import deque
from contextlib import contextmanager
import _thread
import pytz
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.db import DEFAULT_DB_ALIAS, DatabaseError
from django.db.backends import utils
from django.db.backends.base.validation import BaseDatabaseValidation
from django.db.backends.signals import connection_created
from django.db.transaction import TransactionManagementError
from django.db.utils import DatabaseErrorWrapper
from django.utils import timezone
from django.utils.asyncio import async_unsafe
from django.utils.functional import cached_property
NO_DB_ALIAS = '__no_db__'
class BaseDatabaseWrapper:
"""Represent a database connection."""
# Mapping of Field objects to their column types.
data_types = {}
# Mapping of Field objects to their SQL suffix such as AUTOINCREMENT.
data_types_suffix = {}
# Mapping of Field objects to their SQL for CHECK constraints.
data_type_check_constraints = {}
ops = None
vendor = 'unknown'
display_name = 'unknown'
SchemaEditorClass = None
# Classes instantiated in __init__().
client_class = None
creation_class = None
features_class = None
introspection_class = None
ops_class = None
validation_class = BaseDatabaseValidation
queries_limit = 9000
def __init__(self, settings_dict, alias=DEFAULT_DB_ALIAS):
# Connection related attributes.
# The underlying database connection.
self.connection = None
# `settings_dict` should be a dictionary containing keys such as
# NAME, USER, etc. It's called `settings_dict` instead of `settings`
# to disambiguate it from Django settings modules.
self.settings_dict = settings_dict
self.alias = alias
# Query logging in debug mode or when explicitly enabled.
self.queries_log = deque(maxlen=self.queries_limit)
self.force_debug_cursor = False
# Transaction related attributes.
# Tracks if the connection is in autocommit mode. Per PEP 249, by
# default, it isn't.
self.autocommit = False
# Tracks if the connection is in a transaction managed by 'atomic'.
self.in_atomic_block = False
# Increment to generate unique savepoint ids.
self.savepoint_state = 0
# List of savepoints created by 'atomic'.
self.savepoint_ids = []
# Tracks if the outermost 'atomic' block should commit on exit,
# ie. if autocommit was active on entry.
self.commit_on_exit = True
# Tracks if the transaction should be rolled back to the next
# available savepoint because of an exception in an inner block.
self.needs_rollback = False
# Connection termination related attributes.
self.close_at = None
self.closed_in_transaction = False
self.errors_occurred = False
# Thread-safety related attributes.
self._thread_sharing_lock = threading.Lock()
self._thread_sharing_count = 0
self._thread_ident = _thread.get_ident()
# A list of no-argument functions to run when the transaction commits.
# Each entry is an (sids, func) tuple, where sids is a set of the
# active savepoint IDs when this function was registered.
self.run_on_commit = []
# Should we run the on-commit hooks the next time set_autocommit(True)
# is called?
self.run_commit_hooks_on_set_autocommit_on = False
# A stack of wrappers to be invoked around execute()/executemany()
# calls. Each entry is a function taking five arguments: execute, sql,
# params, many, and context. It's the function's responsibility to
# call execute(sql, params, many, context).
self.execute_wrappers = []
self.client = self.client_class(self)
self.creation = self.creation_class(self)
self.features = self.features_class(self)
self.introspection = self.introspection_class(self)
self.ops = self.ops_class(self)
self.validation = self.validation_class(self)
def ensure_timezone(self):
"""
Ensure the connection's timezone is set to `self.timezone_name` and
return whether it changed or not.
"""
return False
@cached_property
def timezone(self):
"""
Return a tzinfo of the database connection time zone.
This is only used when time zone support is enabled. When a datetime is
read from the database, it is always returned in this time zone.
When the database backend supports time zones, it doesn't matter which
time zone Django uses, as long as aware datetimes are used everywhere.
Other users connecting to the database can choose their own time zone.
When the database backend doesn't support time zones, the time zone
Django uses may be constrained by the requirements of other users of
the database.
"""
if not settings.USE_TZ:
return None
elif self.settings_dict['TIME_ZONE'] is None:
return timezone.utc
else:
return pytz.timezone(self.settings_dict['TIME_ZONE'])
@cached_property
def timezone_name(self):
"""
Name of the time zone of the database connection.
"""
if not settings.USE_TZ:
return settings.TIME_ZONE
elif self.settings_dict['TIME_ZONE'] is None:
return 'UTC'
else:
return self.settings_dict['TIME_ZONE']
@property
def queries_logged(self):
return self.force_debug_cursor or settings.DEBUG
@property
def queries(self):
if len(self.queries_log) == self.queries_log.maxlen:
warnings.warn(
"Limit for query logging exceeded, only the last {} queries "
"will be returned.".format(self.queries_log.maxlen))
return list(self.queries_log)
# ##### Backend-specific methods for creating connections and cursors #####
def get_connection_params(self):
"""Return a dict of parameters suitable for get_new_connection."""
raise NotImplementedError('subclasses of BaseDatabaseWrapper may require a get_connection_params() method')
def get_new_connection(self, conn_params):
"""Open a connection to the database."""
raise NotImplementedError('subclasses of BaseDatabaseWrapper may require a get_new_connection() method')
def init_connection_state(self):
"""Initialize the database connection settings."""
raise NotImplementedError('subclasses of BaseDatabaseWrapper may require an init_connection_state() method')
def create_cursor(self, name=None):
"""Create a cursor. Assume that a connection is established."""
raise NotImplementedError('subclasses of BaseDatabaseWrapper may require a create_cursor() method')
# ##### Backend-specific methods for creating connections #####
@async_unsafe
def connect(self):
"""Connect to the database. Assume that the connection is closed."""
# Check for invalid configurations.
self.check_settings()
# In case the previous connection was closed while in an atomic block
self.in_atomic_block = False
self.savepoint_ids = []
self.needs_rollback = False
# Reset parameters defining when to close the connection
max_age = self.settings_dict['CONN_MAX_AGE']
self.close_at = None if max_age is None else time.monotonic() + max_age
self.closed_in_transaction = False
self.errors_occurred = False
# Establish the connection
conn_params = self.get_connection_params()
self.connection = self.get_new_connection(conn_params)
self.set_autocommit(self.settings_dict['AUTOCOMMIT'])
self.init_connection_state()
connection_created.send(sender=self.__class__, connection=self)
self.run_on_commit = []
def check_settings(self):
if self.settings_dict['TIME_ZONE'] is not None and not settings.USE_TZ:
raise ImproperlyConfigured(
"Connection '%s' cannot set TIME_ZONE because USE_TZ is False."
% self.alias
)
@async_unsafe
def ensure_connection(self):
"""Guarantee that a connection to the database is established."""
if self.connection is None:
with self.wrap_database_errors:
self.connect()
# ##### Backend-specific wrappers for PEP-249 connection methods #####
def _prepare_cursor(self, cursor):
"""
Validate the connection is usable and perform database cursor wrapping.
"""
self.validate_thread_sharing()
if self.queries_logged:
wrapped_cursor = self.make_debug_cursor(cursor)
else:
wrapped_cursor = self.make_cursor(cursor)
return wrapped_cursor
def _cursor(self, name=None):
self.ensure_connection()
with self.wrap_database_errors:
return self._prepare_cursor(self.create_cursor(name))
def _commit(self):
if self.connection is not None:
with self.wrap_database_errors:
return self.connection.commit()
def _rollback(self):
if self.connection is not None:
with self.wrap_database_errors:
return self.connection.rollback()
def _close(self):
if self.connection is not None:
with self.wrap_database_errors:
return self.connection.close()
# ##### Generic wrappers for PEP-249 connection methods #####
@async_unsafe
def cursor(self):
"""Create a cursor, opening a connection if necessary."""
return self._cursor()
@async_unsafe
def commit(self):
"""Commit a transaction and reset the dirty flag."""
self.validate_thread_sharing()
self.validate_no_atomic_block()
self._commit()
# A successful commit means that the database connection works.
self.errors_occurred = False
self.run_commit_hooks_on_set_autocommit_on = True
@async_unsafe
def rollback(self):
"""Roll back a transaction and reset the dirty flag."""
self.validate_thread_sharing()
self.validate_no_atomic_block()
self._rollback()
# A successful rollback means that the database connection works.
self.errors_occurred = False
self.needs_rollback = False
self.run_on_commit = []
@async_unsafe
def close(self):
"""Close the connection to the database."""
self.validate_thread_sharing()
self.run_on_commit = []
# Don't call validate_no_atomic_block() to avoid making it difficult
# to get rid of a connection in an invalid state. The next connect()
# will reset the transaction state anyway.
if self.closed_in_transaction or self.connection is None:
return
try:
self._close()
finally:
if self.in_atomic_block:
self.closed_in_transaction = True
self.needs_rollback = True
else:
self.connection = None
# ##### Backend-specific savepoint management methods #####
def _savepoint(self, sid):
with self.cursor() as cursor:
cursor.execute(self.ops.savepoint_create_sql(sid))
def _savepoint_rollback(self, sid):
with self.cursor() as cursor:
cursor.execute(self.ops.savepoint_rollback_sql(sid))
def _savepoint_commit(self, sid):
with self.cursor() as cursor:
cursor.execute(self.ops.savepoint_commit_sql(sid))
def _savepoint_allowed(self):
# Savepoints cannot be created outside a transaction
return self.features.uses_savepoints and not self.get_autocommit()
# ##### Generic savepoint management methods #####
@async_unsafe
def savepoint(self):
"""
Create a savepoint inside the current transaction. Return an
identifier for the savepoint that will be used for the subsequent
rollback or commit. Do nothing if savepoints are not supported.
"""
if not self._savepoint_allowed():
return
thread_ident = _thread.get_ident()
tid = str(thread_ident).replace('-', '')
self.savepoint_state += 1
sid = "s%s_x%d" % (tid, self.savepoint_state)
self.validate_thread_sharing()
self._savepoint(sid)
return sid
@async_unsafe
def savepoint_rollback(self, sid):
"""
Roll back to a savepoint. Do nothing if savepoints are not supported.
"""
if not self._savepoint_allowed():
return
self.validate_thread_sharing()
self._savepoint_rollback(sid)
# Remove any callbacks registered while this savepoint was active.
self.run_on_commit = [
(sids, func) for (sids, func) in self.run_on_commit if sid not in sids
]
@async_unsafe
def savepoint_commit(self, sid):
"""
Release a savepoint. Do nothing if savepoints are not supported.
"""
if not self._savepoint_allowed():
return
self.validate_thread_sharing()
self._savepoint_commit(sid)
@async_unsafe
def clean_savepoints(self):
"""
Reset the counter used to generate unique savepoint ids in this thread.
"""
self.savepoint_state = 0
# ##### Backend-specific transaction management methods #####
def _set_autocommit(self, autocommit):
"""
Backend-specific implementation to enable or disable autocommit.
"""
raise NotImplementedError('subclasses of BaseDatabaseWrapper may require a _set_autocommit() method')
# ##### Generic transaction management methods #####
def get_autocommit(self):
"""Get the autocommit state."""
self.ensure_connection()
return self.autocommit
def set_autocommit(self, autocommit, force_begin_transaction_with_broken_autocommit=False):
"""
Enable or disable autocommit.
The usual way to start a transaction is to turn autocommit off.
SQLite does not properly start a transaction when disabling
autocommit. To avoid this buggy behavior and to actually enter a new
transaction, an explicit BEGIN is required. Using
force_begin_transaction_with_broken_autocommit=True will issue an
explicit BEGIN with SQLite. This option will be ignored for other
backends.
"""
self.validate_no_atomic_block()
self.ensure_connection()
start_transaction_under_autocommit = (
force_begin_transaction_with_broken_autocommit and not autocommit and
hasattr(self, '_start_transaction_under_autocommit')
)
if start_transaction_under_autocommit:
self._start_transaction_under_autocommit()
else:
self._set_autocommit(autocommit)
self.autocommit = autocommit
if autocommit and self.run_commit_hooks_on_set_autocommit_on:
self.run_and_clear_commit_hooks()
self.run_commit_hooks_on_set_autocommit_on = False
def get_rollback(self):
"""Get the "needs rollback" flag -- for *advanced use* only."""
if not self.in_atomic_block:
raise TransactionManagementError(
"The rollback flag doesn't work outside of an 'atomic' block.")
return self.needs_rollback
def set_rollback(self, rollback):
"""
Set or unset the "needs rollback" flag -- for *advanced use* only.
"""
if not self.in_atomic_block:
raise TransactionManagementError(
"The rollback flag doesn't work outside of an 'atomic' block.")
self.needs_rollback = rollback
def validate_no_atomic_block(self):
"""Raise an error if an atomic block is active."""
if self.in_atomic_block:
raise TransactionManagementError(
"This is forbidden when an 'atomic' block is active.")
def validate_no_broken_transaction(self):
if self.needs_rollback:
raise TransactionManagementError(
"An error occurred in the current transaction. You can't "
"execute queries until the end of the 'atomic' block.")
# ##### Foreign key constraints checks handling #####
@contextmanager
def constraint_checks_disabled(self):
"""
Disable foreign key constraint checking.
"""
disabled = self.disable_constraint_checking()
try:
yield
finally:
if disabled:
self.enable_constraint_checking()
def disable_constraint_checking(self):
"""
Backends can implement as needed to temporarily disable foreign key
constraint checking. Should return True if the constraints were
disabled and will need to be reenabled.
"""
return False
def enable_constraint_checking(self):
"""
Backends can implement as needed to re-enable foreign key constraint
checking.
"""
pass
def check_constraints(self, table_names=None):
"""
Backends can override this method if they can apply constraint
checking (e.g. via "SET CONSTRAINTS ALL IMMEDIATE"). Should raise an
IntegrityError if any invalid foreign key references are encountered.
"""
pass
# ##### Connection termination handling #####
def is_usable(self):
"""
Test if the database connection is usable.
This method may assume that self.connection is not None.
Actual implementations should take care not to raise exceptions
as that may prevent Django from recycling unusable connections.
"""
raise NotImplementedError(
"subclasses of BaseDatabaseWrapper may require an is_usable() method")
def close_if_unusable_or_obsolete(self):
"""
Close the current connection if unrecoverable errors have occurred
or if it outlived its maximum age.
"""
if self.connection is not None:
# If the application didn't restore the original autocommit setting,
# don't take chances, drop the connection.
if self.get_autocommit() != self.settings_dict['AUTOCOMMIT']:
self.close()
return
# If an exception other than DataError or IntegrityError occurred
# since the last commit / rollback, check if the connection works.
if self.errors_occurred:
if self.is_usable():
self.errors_occurred = False
else:
self.close()
return
if self.close_at is not None and time.monotonic() >= self.close_at:
self.close()
return
# ##### Thread safety handling #####
@property
def allow_thread_sharing(self):
with self._thread_sharing_lock:
return self._thread_sharing_count > 0
def inc_thread_sharing(self):
with self._thread_sharing_lock:
self._thread_sharing_count += 1
def dec_thread_sharing(self):
with self._thread_sharing_lock:
if self._thread_sharing_count <= 0:
raise RuntimeError('Cannot decrement the thread sharing count below zero.')
self._thread_sharing_count -= 1
def validate_thread_sharing(self):
"""
Validate that the connection isn't accessed by another thread than the
one which originally created it, unless the connection was explicitly
authorized to be shared between threads (via the `inc_thread_sharing()`
method). Raise an exception if the validation fails.
"""
if not (self.allow_thread_sharing or self._thread_ident == _thread.get_ident()):
raise DatabaseError(
"DatabaseWrapper objects created in a "
"thread can only be used in that same thread. The object "
"with alias '%s' was created in thread id %s and this is "
"thread id %s."
% (self.alias, self._thread_ident, _thread.get_ident())
)
# ##### Miscellaneous #####
def prepare_database(self):
"""
Hook to do any database check or preparation, generally called before
migrating a project or an app.
"""
pass
@cached_property
def wrap_database_errors(self):
"""
Context manager and decorator that re-throws backend-specific database
exceptions using Django's common wrappers.
"""
return DatabaseErrorWrapper(self)
def chunked_cursor(self):
"""
Return a cursor that tries to avoid caching in the database (if
supported by the database), otherwise return a regular cursor.
"""
return self.cursor()
def make_debug_cursor(self, cursor):
"""Create a cursor that logs all queries in self.queries_log."""
return utils.CursorDebugWrapper(cursor, self)
def make_cursor(self, cursor):
"""Create a cursor without debug logging."""
return utils.CursorWrapper(cursor, self)
@contextmanager
def temporary_connection(self):
"""
Context manager that ensures that a connection is established, and
if it opened one, closes it to avoid leaving a dangling connection.
This is useful for operations outside of the request-response cycle.
Provide a cursor: with self.temporary_connection() as cursor: ...
"""
must_close = self.connection is None
try:
with self.cursor() as cursor:
yield cursor
finally:
if must_close:
self.close()
@property
def _nodb_connection(self):
"""
Return an alternative connection to be used when there is no need to
access the main database, specifically for test db creation/deletion.
This also prevents the production database from being exposed to
potential child threads while (or after) the test database is destroyed.
Refs #10868, #17786, #16969.
"""
return self.__class__({**self.settings_dict, 'NAME': None}, alias=NO_DB_ALIAS)
def schema_editor(self, *args, **kwargs):
"""
Return a new instance of this backend's SchemaEditor.
"""
if self.SchemaEditorClass is None:
raise NotImplementedError(
'The SchemaEditorClass attribute of this database wrapper is still None')
return self.SchemaEditorClass(self, *args, **kwargs)
def on_commit(self, func):
if self.in_atomic_block:
# Transaction in progress; save for execution on commit.
self.run_on_commit.append((set(self.savepoint_ids), func))
elif not self.get_autocommit():
raise TransactionManagementError('on_commit() cannot be used in manual transaction management')
else:
# No transaction in progress and in autocommit mode; execute
# immediately.
func()
def run_and_clear_commit_hooks(self):
self.validate_no_atomic_block()
current_run_on_commit = self.run_on_commit
self.run_on_commit = []
while current_run_on_commit:
sids, func = current_run_on_commit.pop(0)
func()
@contextmanager
def execute_wrapper(self, wrapper):
"""
Return a context manager under which the wrapper is applied to suitable
database query executions.
"""
self.execute_wrappers.append(wrapper)
try:
yield
finally:
self.execute_wrappers.pop()
def copy(self, alias=None):
"""
Return a copy of this connection.
For tests that require two connections to the same database.
"""
settings_dict = copy.deepcopy(self.settings_dict)
if alias is None:
alias = self.alias
return type(self)(settings_dict, alias)
|
320ddff4d097818ec989651d5139cfe85c163d6a528798529942ca28425b0c8b | import datetime
import decimal
from importlib import import_module
import sqlparse
from django.conf import settings
from django.db import NotSupportedError, transaction
from django.db.backends import utils
from django.utils import timezone
from django.utils.encoding import force_str
class BaseDatabaseOperations:
"""
Encapsulate backend-specific differences, such as the way a backend
performs ordering or calculates the ID of a recently-inserted row.
"""
compiler_module = "django.db.models.sql.compiler"
# Integer field safe ranges by `internal_type` as documented
# in docs/ref/models/fields.txt.
integer_field_ranges = {
'SmallIntegerField': (-32768, 32767),
'IntegerField': (-2147483648, 2147483647),
'BigIntegerField': (-9223372036854775808, 9223372036854775807),
'PositiveBigIntegerField': (0, 9223372036854775807),
'PositiveSmallIntegerField': (0, 32767),
'PositiveIntegerField': (0, 2147483647),
'SmallAutoField': (-32768, 32767),
'AutoField': (-2147483648, 2147483647),
'BigAutoField': (-9223372036854775808, 9223372036854775807),
}
set_operators = {
'union': 'UNION',
'intersection': 'INTERSECT',
'difference': 'EXCEPT',
}
# Mapping of Field.get_internal_type() (typically the model field's class
# name) to the data type to use for the Cast() function, if different from
# DatabaseWrapper.data_types.
cast_data_types = {}
# CharField data type if the max_length argument isn't provided.
cast_char_field_without_max_length = None
# Start and end points for window expressions.
PRECEDING = 'PRECEDING'
FOLLOWING = 'FOLLOWING'
UNBOUNDED_PRECEDING = 'UNBOUNDED ' + PRECEDING
UNBOUNDED_FOLLOWING = 'UNBOUNDED ' + FOLLOWING
CURRENT_ROW = 'CURRENT ROW'
# Prefix for EXPLAIN queries, or None EXPLAIN isn't supported.
explain_prefix = None
def __init__(self, connection):
self.connection = connection
self._cache = None
def autoinc_sql(self, table, column):
"""
Return any SQL needed to support auto-incrementing primary keys, or
None if no SQL is necessary.
This SQL is executed when a table is created.
"""
return None
def bulk_batch_size(self, fields, objs):
"""
Return the maximum allowed batch size for the backend. The fields
are the fields going to be inserted in the batch, the objs contains
all the objects to be inserted.
"""
return len(objs)
def cache_key_culling_sql(self):
"""
Return an SQL query that retrieves the first cache key greater than the
n smallest.
This is used by the 'db' cache backend to determine where to start
culling.
"""
return "SELECT cache_key FROM %s ORDER BY cache_key LIMIT 1 OFFSET %%s"
def unification_cast_sql(self, output_field):
"""
Given a field instance, return the SQL that casts the result of a union
to that type. The resulting string should contain a '%s' placeholder
for the expression being cast.
"""
return '%s'
def date_extract_sql(self, lookup_type, field_name):
"""
Given a lookup_type of 'year', 'month', or 'day', return the SQL that
extracts a value from the given date field field_name.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a date_extract_sql() method')
def date_interval_sql(self, timedelta):
"""
Implement the date interval functionality for expressions.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a date_interval_sql() method')
def date_trunc_sql(self, lookup_type, field_name):
"""
Given a lookup_type of 'year', 'month', or 'day', return the SQL that
truncates the given date field field_name to a date object with only
the given specificity.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a date_trunc_sql() method.')
def datetime_cast_date_sql(self, field_name, tzname):
"""
Return the SQL to cast a datetime value to date value.
"""
raise NotImplementedError(
'subclasses of BaseDatabaseOperations may require a '
'datetime_cast_date_sql() method.'
)
def datetime_cast_time_sql(self, field_name, tzname):
"""
Return the SQL to cast a datetime value to time value.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a datetime_cast_time_sql() method')
def datetime_extract_sql(self, lookup_type, field_name, tzname):
"""
Given a lookup_type of 'year', 'month', 'day', 'hour', 'minute', or
'second', return the SQL that extracts a value from the given
datetime field field_name.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a datetime_extract_sql() method')
def datetime_trunc_sql(self, lookup_type, field_name, tzname):
"""
Given a lookup_type of 'year', 'month', 'day', 'hour', 'minute', or
'second', return the SQL that truncates the given datetime field
field_name to a datetime object with only the given specificity.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a datetime_trunc_sql() method')
def time_trunc_sql(self, lookup_type, field_name):
"""
Given a lookup_type of 'hour', 'minute' or 'second', return the SQL
that truncates the given time field field_name to a time object with
only the given specificity.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a time_trunc_sql() method')
def time_extract_sql(self, lookup_type, field_name):
"""
Given a lookup_type of 'hour', 'minute', or 'second', return the SQL
that extracts a value from the given time field field_name.
"""
return self.date_extract_sql(lookup_type, field_name)
def deferrable_sql(self):
"""
Return the SQL to make a constraint "initially deferred" during a
CREATE TABLE statement.
"""
return ''
def distinct_sql(self, fields, params):
"""
Return an SQL DISTINCT clause which removes duplicate rows from the
result set. If any fields are given, only check the given fields for
duplicates.
"""
if fields:
raise NotSupportedError('DISTINCT ON fields is not supported by this database backend')
else:
return ['DISTINCT'], []
def fetch_returned_insert_columns(self, cursor, returning_params):
"""
Given a cursor object that has just performed an INSERT...RETURNING
statement into a table, return the newly created data.
"""
return cursor.fetchone()
def field_cast_sql(self, db_type, internal_type):
"""
Given a column type (e.g. 'BLOB', 'VARCHAR') and an internal type
(e.g. 'GenericIPAddressField'), return the SQL to cast it before using
it in a WHERE statement. The resulting string should contain a '%s'
placeholder for the column being searched against.
"""
return '%s'
def force_no_ordering(self):
"""
Return a list used in the "ORDER BY" clause to force no ordering at
all. Return an empty list to include nothing in the ordering.
"""
return []
def for_update_sql(self, nowait=False, skip_locked=False, of=()):
"""
Return the FOR UPDATE SQL clause to lock rows for an update operation.
"""
return 'FOR UPDATE%s%s%s' % (
' OF %s' % ', '.join(of) if of else '',
' NOWAIT' if nowait else '',
' SKIP LOCKED' if skip_locked else '',
)
def _get_limit_offset_params(self, low_mark, high_mark):
offset = low_mark or 0
if high_mark is not None:
return (high_mark - offset), offset
elif offset:
return self.connection.ops.no_limit_value(), offset
return None, offset
def limit_offset_sql(self, low_mark, high_mark):
"""Return LIMIT/OFFSET SQL clause."""
limit, offset = self._get_limit_offset_params(low_mark, high_mark)
return ' '.join(sql for sql in (
('LIMIT %d' % limit) if limit else None,
('OFFSET %d' % offset) if offset else None,
) if sql)
def last_executed_query(self, cursor, sql, params):
"""
Return a string of the query last executed by the given cursor, with
placeholders replaced with actual values.
`sql` is the raw query containing placeholders and `params` is the
sequence of parameters. These are used by default, but this method
exists for database backends to provide a better implementation
according to their own quoting schemes.
"""
# Convert params to contain string values.
def to_string(s):
return force_str(s, strings_only=True, errors='replace')
if isinstance(params, (list, tuple)):
u_params = tuple(to_string(val) for val in params)
elif params is None:
u_params = ()
else:
u_params = {to_string(k): to_string(v) for k, v in params.items()}
return "QUERY = %r - PARAMS = %r" % (sql, u_params)
def last_insert_id(self, cursor, table_name, pk_name):
"""
Given a cursor object that has just performed an INSERT statement into
a table that has an auto-incrementing ID, return the newly created ID.
`pk_name` is the name of the primary-key column.
"""
return cursor.lastrowid
def lookup_cast(self, lookup_type, internal_type=None):
"""
Return the string to use in a query when performing lookups
("contains", "like", etc.). It should contain a '%s' placeholder for
the column being searched against.
"""
return "%s"
def max_in_list_size(self):
"""
Return the maximum number of items that can be passed in a single 'IN'
list condition, or None if the backend does not impose a limit.
"""
return None
def max_name_length(self):
"""
Return the maximum length of table and column names, or None if there
is no limit.
"""
return None
def no_limit_value(self):
"""
Return the value to use for the LIMIT when we are wanting "LIMIT
infinity". Return None if the limit clause can be omitted in this case.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a no_limit_value() method')
def pk_default_value(self):
"""
Return the value to use during an INSERT statement to specify that
the field should use its default value.
"""
return 'DEFAULT'
def prepare_sql_script(self, sql):
"""
Take an SQL script that may contain multiple lines and return a list
of statements to feed to successive cursor.execute() calls.
Since few databases are able to process raw SQL scripts in a single
cursor.execute() call and PEP 249 doesn't talk about this use case,
the default implementation is conservative.
"""
return [
sqlparse.format(statement, strip_comments=True)
for statement in sqlparse.split(sql) if statement
]
def process_clob(self, value):
"""
Return the value of a CLOB column, for backends that return a locator
object that requires additional processing.
"""
return value
def return_insert_columns(self, fields):
"""
For backends that support returning columns as part of an insert query,
return the SQL and params to append to the INSERT query. The returned
fragment should contain a format string to hold the appropriate column.
"""
pass
def compiler(self, compiler_name):
"""
Return the SQLCompiler class corresponding to the given name,
in the namespace corresponding to the `compiler_module` attribute
on this backend.
"""
if self._cache is None:
self._cache = import_module(self.compiler_module)
return getattr(self._cache, compiler_name)
def quote_name(self, name):
"""
Return a quoted version of the given table, index, or column name. Do
not quote the given name if it's already been quoted.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a quote_name() method')
def random_function_sql(self):
"""Return an SQL expression that returns a random value."""
return 'RANDOM()'
def regex_lookup(self, lookup_type):
"""
Return the string to use in a query when performing regular expression
lookups (using "regex" or "iregex"). It should contain a '%s'
placeholder for the column being searched against.
If the feature is not supported (or part of it is not supported), raise
NotImplementedError.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations may require a regex_lookup() method')
def savepoint_create_sql(self, sid):
"""
Return the SQL for starting a new savepoint. Only required if the
"uses_savepoints" feature is True. The "sid" parameter is a string
for the savepoint id.
"""
return "SAVEPOINT %s" % self.quote_name(sid)
def savepoint_commit_sql(self, sid):
"""
Return the SQL for committing the given savepoint.
"""
return "RELEASE SAVEPOINT %s" % self.quote_name(sid)
def savepoint_rollback_sql(self, sid):
"""
Return the SQL for rolling back the given savepoint.
"""
return "ROLLBACK TO SAVEPOINT %s" % self.quote_name(sid)
def set_time_zone_sql(self):
"""
Return the SQL that will set the connection's time zone.
Return '' if the backend doesn't support time zones.
"""
return ''
def sql_flush(self, style, tables, sequences, allow_cascade=False):
"""
Return a list of SQL statements required to remove all data from
the given database tables (without actually removing the tables
themselves) and the SQL statements required to reset the sequences
passed in `sequences`.
The `style` argument is a Style object as returned by either
color_style() or no_style() in django.core.management.color.
The `allow_cascade` argument determines whether truncation may cascade
to tables with foreign keys pointing the tables being truncated.
PostgreSQL requires a cascade even if these tables are empty.
"""
raise NotImplementedError('subclasses of BaseDatabaseOperations must provide a sql_flush() method')
def execute_sql_flush(self, using, sql_list):
"""Execute a list of SQL statements to flush the database."""
with transaction.atomic(using=using, savepoint=self.connection.features.can_rollback_ddl):
with self.connection.cursor() as cursor:
for sql in sql_list:
cursor.execute(sql)
def sequence_reset_by_name_sql(self, style, sequences):
"""
Return a list of the SQL statements required to reset sequences
passed in `sequences`.
The `style` argument is a Style object as returned by either
color_style() or no_style() in django.core.management.color.
"""
return []
def sequence_reset_sql(self, style, model_list):
"""
Return a list of the SQL statements required to reset sequences for
the given models.
The `style` argument is a Style object as returned by either
color_style() or no_style() in django.core.management.color.
"""
return [] # No sequence reset required by default.
def start_transaction_sql(self):
"""Return the SQL statement required to start a transaction."""
return "BEGIN;"
def end_transaction_sql(self, success=True):
"""Return the SQL statement required to end a transaction."""
if not success:
return "ROLLBACK;"
return "COMMIT;"
def tablespace_sql(self, tablespace, inline=False):
"""
Return the SQL that will be used in a query to define the tablespace.
Return '' if the backend doesn't support tablespaces.
If `inline` is True, append the SQL to a row; otherwise append it to
the entire CREATE TABLE or CREATE INDEX statement.
"""
return ''
def prep_for_like_query(self, x):
"""Prepare a value for use in a LIKE query."""
return str(x).replace("\\", "\\\\").replace("%", r"\%").replace("_", r"\_")
# Same as prep_for_like_query(), but called for "iexact" matches, which
# need not necessarily be implemented using "LIKE" in the backend.
prep_for_iexact_query = prep_for_like_query
def validate_autopk_value(self, value):
"""
Certain backends do not accept some values for "serial" fields
(for example zero in MySQL). Raise a ValueError if the value is
invalid, otherwise return the validated value.
"""
return value
def adapt_unknown_value(self, value):
"""
Transform a value to something compatible with the backend driver.
This method only depends on the type of the value. It's designed for
cases where the target type isn't known, such as .raw() SQL queries.
As a consequence it may not work perfectly in all circumstances.
"""
if isinstance(value, datetime.datetime): # must be before date
return self.adapt_datetimefield_value(value)
elif isinstance(value, datetime.date):
return self.adapt_datefield_value(value)
elif isinstance(value, datetime.time):
return self.adapt_timefield_value(value)
elif isinstance(value, decimal.Decimal):
return self.adapt_decimalfield_value(value)
else:
return value
def adapt_datefield_value(self, value):
"""
Transform a date value to an object compatible with what is expected
by the backend driver for date columns.
"""
if value is None:
return None
return str(value)
def adapt_datetimefield_value(self, value):
"""
Transform a datetime value to an object compatible with what is expected
by the backend driver for datetime columns.
"""
if value is None:
return None
return str(value)
def adapt_timefield_value(self, value):
"""
Transform a time value to an object compatible with what is expected
by the backend driver for time columns.
"""
if value is None:
return None
if timezone.is_aware(value):
raise ValueError("Django does not support timezone-aware times.")
return str(value)
def adapt_decimalfield_value(self, value, max_digits=None, decimal_places=None):
"""
Transform a decimal.Decimal value to an object compatible with what is
expected by the backend driver for decimal (numeric) columns.
"""
return utils.format_number(value, max_digits, decimal_places)
def adapt_ipaddressfield_value(self, value):
"""
Transform a string representation of an IP address into the expected
type for the backend driver.
"""
return value or None
def year_lookup_bounds_for_date_field(self, value):
"""
Return a two-elements list with the lower and upper bound to be used
with a BETWEEN operator to query a DateField value using a year
lookup.
`value` is an int, containing the looked-up year.
"""
first = datetime.date(value, 1, 1)
second = datetime.date(value, 12, 31)
first = self.adapt_datefield_value(first)
second = self.adapt_datefield_value(second)
return [first, second]
def year_lookup_bounds_for_datetime_field(self, value):
"""
Return a two-elements list with the lower and upper bound to be used
with a BETWEEN operator to query a DateTimeField value using a year
lookup.
`value` is an int, containing the looked-up year.
"""
first = datetime.datetime(value, 1, 1)
second = datetime.datetime(value, 12, 31, 23, 59, 59, 999999)
if settings.USE_TZ:
tz = timezone.get_current_timezone()
first = timezone.make_aware(first, tz)
second = timezone.make_aware(second, tz)
first = self.adapt_datetimefield_value(first)
second = self.adapt_datetimefield_value(second)
return [first, second]
def get_db_converters(self, expression):
"""
Return a list of functions needed to convert field data.
Some field types on some backends do not provide data in the correct
format, this is the hook for converter functions.
"""
return []
def convert_durationfield_value(self, value, expression, connection):
if value is not None:
return datetime.timedelta(0, 0, value)
def check_expression_support(self, expression):
"""
Check that the backend supports the provided expression.
This is used on specific backends to rule out known expressions
that have problematic or nonexistent implementations. If the
expression has a known problem, the backend should raise
NotSupportedError.
"""
pass
def conditional_expression_supported_in_where_clause(self, expression):
"""
Return True, if the conditional expression is supported in the WHERE
clause.
"""
return True
def combine_expression(self, connector, sub_expressions):
"""
Combine a list of subexpressions into a single expression, using
the provided connecting operator. This is required because operators
can vary between backends (e.g., Oracle with %% and &) and between
subexpression types (e.g., date expressions).
"""
conn = ' %s ' % connector
return conn.join(sub_expressions)
def combine_duration_expression(self, connector, sub_expressions):
return self.combine_expression(connector, sub_expressions)
def binary_placeholder_sql(self, value):
"""
Some backends require special syntax to insert binary content (MySQL
for example uses '_binary %s').
"""
return '%s'
def modify_insert_params(self, placeholder, params):
"""
Allow modification of insert parameters. Needed for Oracle Spatial
backend due to #10888.
"""
return params
def integer_field_range(self, internal_type):
"""
Given an integer field internal type (e.g. 'PositiveIntegerField'),
return a tuple of the (min_value, max_value) form representing the
range of the column type bound to the field.
"""
return self.integer_field_ranges[internal_type]
def subtract_temporals(self, internal_type, lhs, rhs):
if self.connection.features.supports_temporal_subtraction:
lhs_sql, lhs_params = lhs
rhs_sql, rhs_params = rhs
return '(%s - %s)' % (lhs_sql, rhs_sql), (*lhs_params, *rhs_params)
raise NotSupportedError("This backend does not support %s subtraction." % internal_type)
def window_frame_start(self, start):
if isinstance(start, int):
if start < 0:
return '%d %s' % (abs(start), self.PRECEDING)
elif start == 0:
return self.CURRENT_ROW
elif start is None:
return self.UNBOUNDED_PRECEDING
raise ValueError("start argument must be a negative integer, zero, or None, but got '%s'." % start)
def window_frame_end(self, end):
if isinstance(end, int):
if end == 0:
return self.CURRENT_ROW
elif end > 0:
return '%d %s' % (end, self.FOLLOWING)
elif end is None:
return self.UNBOUNDED_FOLLOWING
raise ValueError("end argument must be a positive integer, zero, or None, but got '%s'." % end)
def window_frame_rows_start_end(self, start=None, end=None):
"""
Return SQL for start and end points in an OVER clause window frame.
"""
if not self.connection.features.supports_over_clause:
raise NotSupportedError('This backend does not support window expressions.')
return self.window_frame_start(start), self.window_frame_end(end)
def window_frame_range_start_end(self, start=None, end=None):
start_, end_ = self.window_frame_rows_start_end(start, end)
if (
self.connection.features.only_supports_unbounded_with_preceding_and_following and
((start and start < 0) or (end and end > 0))
):
raise NotSupportedError(
'%s only supports UNBOUNDED together with PRECEDING and '
'FOLLOWING.' % self.connection.display_name
)
return start_, end_
def explain_query_prefix(self, format=None, **options):
if not self.connection.features.supports_explaining_query_execution:
raise NotSupportedError('This backend does not support explaining query execution.')
if format:
supported_formats = self.connection.features.supported_explain_formats
normalized_format = format.upper()
if normalized_format not in supported_formats:
msg = '%s is not a recognized format.' % normalized_format
if supported_formats:
msg += ' Allowed formats: %s' % ', '.join(sorted(supported_formats))
raise ValueError(msg)
if options:
raise ValueError('Unknown options: %s' % ', '.join(sorted(options.keys())))
return self.explain_prefix
def insert_statement(self, ignore_conflicts=False):
return 'INSERT INTO'
def ignore_conflicts_suffix_sql(self, ignore_conflicts=None):
return ''
|
eb5a3995377bc7d070c7ecbabf13bfb936e17e4890e836a681c2df032d775484 | from collections import namedtuple
import sqlparse
from MySQLdb.constants import FIELD_TYPE
from django.db.backends.base.introspection import (
BaseDatabaseIntrospection, FieldInfo as BaseFieldInfo, TableInfo,
)
from django.db.models import Index
from django.utils.datastructures import OrderedSet
FieldInfo = namedtuple('FieldInfo', BaseFieldInfo._fields + ('extra', 'is_unsigned'))
InfoLine = namedtuple('InfoLine', 'col_name data_type max_len num_prec num_scale extra column_default is_unsigned')
class DatabaseIntrospection(BaseDatabaseIntrospection):
data_types_reverse = {
FIELD_TYPE.BLOB: 'TextField',
FIELD_TYPE.CHAR: 'CharField',
FIELD_TYPE.DECIMAL: 'DecimalField',
FIELD_TYPE.NEWDECIMAL: 'DecimalField',
FIELD_TYPE.DATE: 'DateField',
FIELD_TYPE.DATETIME: 'DateTimeField',
FIELD_TYPE.DOUBLE: 'FloatField',
FIELD_TYPE.FLOAT: 'FloatField',
FIELD_TYPE.INT24: 'IntegerField',
FIELD_TYPE.LONG: 'IntegerField',
FIELD_TYPE.LONGLONG: 'BigIntegerField',
FIELD_TYPE.SHORT: 'SmallIntegerField',
FIELD_TYPE.STRING: 'CharField',
FIELD_TYPE.TIME: 'TimeField',
FIELD_TYPE.TIMESTAMP: 'DateTimeField',
FIELD_TYPE.TINY: 'IntegerField',
FIELD_TYPE.TINY_BLOB: 'TextField',
FIELD_TYPE.MEDIUM_BLOB: 'TextField',
FIELD_TYPE.LONG_BLOB: 'TextField',
FIELD_TYPE.VAR_STRING: 'CharField',
}
def get_field_type(self, data_type, description):
field_type = super().get_field_type(data_type, description)
if 'auto_increment' in description.extra:
if field_type == 'IntegerField':
return 'AutoField'
elif field_type == 'BigIntegerField':
return 'BigAutoField'
elif field_type == 'SmallIntegerField':
return 'SmallAutoField'
if description.is_unsigned:
if field_type == 'BigIntegerField':
return 'PositiveBigIntegerField'
elif field_type == 'IntegerField':
return 'PositiveIntegerField'
elif field_type == 'SmallIntegerField':
return 'PositiveSmallIntegerField'
return field_type
def get_table_list(self, cursor):
"""Return a list of table and view names in the current database."""
cursor.execute("SHOW FULL TABLES")
return [TableInfo(row[0], {'BASE TABLE': 't', 'VIEW': 'v'}.get(row[1]))
for row in cursor.fetchall()]
def get_table_description(self, cursor, table_name):
"""
Return a description of the table with the DB-API cursor.description
interface."
"""
# information_schema database gives more accurate results for some figures:
# - varchar length returned by cursor.description is an internal length,
# not visible length (#5725)
# - precision and scale (for decimal fields) (#5014)
# - auto_increment is not available in cursor.description
cursor.execute("""
SELECT
column_name, data_type, character_maximum_length,
numeric_precision, numeric_scale, extra, column_default,
CASE
WHEN column_type LIKE '%% unsigned' THEN 1
ELSE 0
END AS is_unsigned
FROM information_schema.columns
WHERE table_name = %s AND table_schema = DATABASE()""", [table_name])
field_info = {line[0]: InfoLine(*line) for line in cursor.fetchall()}
cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name))
def to_int(i):
return int(i) if i is not None else i
fields = []
for line in cursor.description:
info = field_info[line[0]]
fields.append(FieldInfo(
*line[:3],
to_int(info.max_len) or line[3],
to_int(info.num_prec) or line[4],
to_int(info.num_scale) or line[5],
line[6],
info.column_default,
info.extra,
info.is_unsigned,
))
return fields
def get_sequences(self, cursor, table_name, table_fields=()):
for field_info in self.get_table_description(cursor, table_name):
if 'auto_increment' in field_info.extra:
# MySQL allows only one auto-increment column per table.
return [{'table': table_name, 'column': field_info.name}]
return []
def get_relations(self, cursor, table_name):
"""
Return a dictionary of {field_name: (field_name_other_table, other_table)}
representing all relationships to the given table.
"""
constraints = self.get_key_columns(cursor, table_name)
relations = {}
for my_fieldname, other_table, other_field in constraints:
relations[my_fieldname] = (other_field, other_table)
return relations
def get_key_columns(self, cursor, table_name):
"""
Return a list of (column_name, referenced_table_name, referenced_column_name)
for all key columns in the given table.
"""
key_columns = []
cursor.execute("""
SELECT column_name, referenced_table_name, referenced_column_name
FROM information_schema.key_column_usage
WHERE table_name = %s
AND table_schema = DATABASE()
AND referenced_table_name IS NOT NULL
AND referenced_column_name IS NOT NULL""", [table_name])
key_columns.extend(cursor.fetchall())
return key_columns
def get_storage_engine(self, cursor, table_name):
"""
Retrieve the storage engine for a given table. Return the default
storage engine if the table doesn't exist.
"""
cursor.execute(
"SELECT engine "
"FROM information_schema.tables "
"WHERE table_name = %s", [table_name])
result = cursor.fetchone()
if not result:
return self.connection.features._mysql_storage_engine
return result[0]
def _parse_constraint_columns(self, check_clause, columns):
check_columns = OrderedSet()
statement = sqlparse.parse(check_clause)[0]
tokens = (token for token in statement.flatten() if not token.is_whitespace)
for token in tokens:
if (
token.ttype == sqlparse.tokens.Name and
self.connection.ops.quote_name(token.value) == token.value and
token.value[1:-1] in columns
):
check_columns.add(token.value[1:-1])
return check_columns
def get_constraints(self, cursor, table_name):
"""
Retrieve any constraints or keys (unique, pk, fk, check, index) across
one or more columns.
"""
constraints = {}
# Get the actual constraint names and columns
name_query = """
SELECT kc.`constraint_name`, kc.`column_name`,
kc.`referenced_table_name`, kc.`referenced_column_name`
FROM information_schema.key_column_usage AS kc
WHERE
kc.table_schema = DATABASE() AND
kc.table_name = %s
ORDER BY kc.`ordinal_position`
"""
cursor.execute(name_query, [table_name])
for constraint, column, ref_table, ref_column in cursor.fetchall():
if constraint not in constraints:
constraints[constraint] = {
'columns': OrderedSet(),
'primary_key': False,
'unique': False,
'index': False,
'check': False,
'foreign_key': (ref_table, ref_column) if ref_column else None,
}
constraints[constraint]['columns'].add(column)
# Now get the constraint types
type_query = """
SELECT c.constraint_name, c.constraint_type
FROM information_schema.table_constraints AS c
WHERE
c.table_schema = DATABASE() AND
c.table_name = %s
"""
cursor.execute(type_query, [table_name])
for constraint, kind in cursor.fetchall():
if kind.lower() == "primary key":
constraints[constraint]['primary_key'] = True
constraints[constraint]['unique'] = True
elif kind.lower() == "unique":
constraints[constraint]['unique'] = True
# Add check constraints.
if self.connection.features.can_introspect_check_constraints:
unnamed_constraints_index = 0
columns = {info.name for info in self.get_table_description(cursor, table_name)}
if self.connection.mysql_is_mariadb:
type_query = """
SELECT c.constraint_name, c.check_clause
FROM information_schema.check_constraints AS c
WHERE
c.constraint_schema = DATABASE() AND
c.table_name = %s
"""
else:
type_query = """
SELECT cc.constraint_name, cc.check_clause
FROM
information_schema.check_constraints AS cc,
information_schema.table_constraints AS tc
WHERE
cc.constraint_schema = DATABASE() AND
tc.table_schema = cc.constraint_schema AND
cc.constraint_name = tc.constraint_name AND
tc.constraint_type = 'CHECK' AND
tc.table_name = %s
"""
cursor.execute(type_query, [table_name])
for constraint, check_clause in cursor.fetchall():
constraint_columns = self._parse_constraint_columns(check_clause, columns)
# Ensure uniqueness of unnamed constraints. Unnamed unique
# and check columns constraints have the same name as
# a column.
if set(constraint_columns) == {constraint}:
unnamed_constraints_index += 1
constraint = '__unnamed_constraint_%s__' % unnamed_constraints_index
constraints[constraint] = {
'columns': constraint_columns,
'primary_key': False,
'unique': False,
'index': False,
'check': True,
'foreign_key': None,
}
# Now add in the indexes
cursor.execute("SHOW INDEX FROM %s" % self.connection.ops.quote_name(table_name))
for table, non_unique, index, colseq, column, type_ in [x[:5] + (x[10],) for x in cursor.fetchall()]:
if index not in constraints:
constraints[index] = {
'columns': OrderedSet(),
'primary_key': False,
'unique': False,
'check': False,
'foreign_key': None,
}
constraints[index]['index'] = True
constraints[index]['type'] = Index.suffix if type_ == 'BTREE' else type_.lower()
constraints[index]['columns'].add(column)
# Convert the sorted sets to lists
for constraint in constraints.values():
constraint['columns'] = list(constraint['columns'])
return constraints
|
37b5a75a8d17dc68a0d9f540bd170bf515acb14200d1ffdb75c8c4655548a058 | """
MySQL database backend for Django.
Requires mysqlclient: https://pypi.org/project/mysqlclient/
"""
from django.core.exceptions import ImproperlyConfigured
from django.db import IntegrityError
from django.db.backends import utils as backend_utils
from django.db.backends.base.base import BaseDatabaseWrapper
from django.utils.asyncio import async_unsafe
from django.utils.functional import cached_property
from django.utils.regex_helper import _lazy_re_compile
try:
import MySQLdb as Database
except ImportError as err:
raise ImproperlyConfigured(
'Error loading MySQLdb module.\n'
'Did you install mysqlclient?'
) from err
from MySQLdb.constants import CLIENT, FIELD_TYPE # isort:skip
from MySQLdb.converters import conversions # isort:skip
# Some of these import MySQLdb, so import them after checking if it's installed.
from .client import DatabaseClient # isort:skip
from .creation import DatabaseCreation # isort:skip
from .features import DatabaseFeatures # isort:skip
from .introspection import DatabaseIntrospection # isort:skip
from .operations import DatabaseOperations # isort:skip
from .schema import DatabaseSchemaEditor # isort:skip
from .validation import DatabaseValidation # isort:skip
version = Database.version_info
if version < (1, 3, 13):
raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)
# MySQLdb returns TIME columns as timedelta -- they are more like timedelta in
# terms of actual behavior as they are signed and include days -- and Django
# expects time.
django_conversions = {
**conversions,
**{FIELD_TYPE.TIME: backend_utils.typecast_time},
}
# This should match the numerical portion of the version numbers (we can treat
# versions like 5.0.24 and 5.0.24a as the same).
server_version_re = _lazy_re_compile(r'(\d{1,2})\.(\d{1,2})\.(\d{1,2})')
class CursorWrapper:
"""
A thin wrapper around MySQLdb's normal cursor class that catches particular
exception instances and reraises them with the correct types.
Implemented as a wrapper, rather than a subclass, so that it isn't stuck
to the particular underlying representation returned by Connection.cursor().
"""
codes_for_integrityerror = (
1048, # Column cannot be null
1690, # BIGINT UNSIGNED value is out of range
3819, # CHECK constraint is violated
4025, # CHECK constraint failed
)
def __init__(self, cursor):
self.cursor = cursor
def execute(self, query, args=None):
try:
# args is None means no string interpolation
return self.cursor.execute(query, args)
except Database.OperationalError as e:
# Map some error codes to IntegrityError, since they seem to be
# misclassified and Django would prefer the more logical place.
if e.args[0] in self.codes_for_integrityerror:
raise IntegrityError(*tuple(e.args))
raise
def executemany(self, query, args):
try:
return self.cursor.executemany(query, args)
except Database.OperationalError as e:
# Map some error codes to IntegrityError, since they seem to be
# misclassified and Django would prefer the more logical place.
if e.args[0] in self.codes_for_integrityerror:
raise IntegrityError(*tuple(e.args))
raise
def __getattr__(self, attr):
return getattr(self.cursor, attr)
def __iter__(self):
return iter(self.cursor)
class DatabaseWrapper(BaseDatabaseWrapper):
vendor = 'mysql'
# This dictionary maps Field objects to their associated MySQL column
# types, as strings. Column-type strings can contain format strings; they'll
# be interpolated against the values of Field.__dict__ before being output.
# If a column type is set to None, it won't be included in the output.
data_types = {
'AutoField': 'integer AUTO_INCREMENT',
'BigAutoField': 'bigint AUTO_INCREMENT',
'BinaryField': 'longblob',
'BooleanField': 'bool',
'CharField': 'varchar(%(max_length)s)',
'DateField': 'date',
'DateTimeField': 'datetime(6)',
'DecimalField': 'numeric(%(max_digits)s, %(decimal_places)s)',
'DurationField': 'bigint',
'FileField': 'varchar(%(max_length)s)',
'FilePathField': 'varchar(%(max_length)s)',
'FloatField': 'double precision',
'IntegerField': 'integer',
'BigIntegerField': 'bigint',
'IPAddressField': 'char(15)',
'GenericIPAddressField': 'char(39)',
'NullBooleanField': 'bool',
'OneToOneField': 'integer',
'PositiveBigIntegerField': 'bigint UNSIGNED',
'PositiveIntegerField': 'integer UNSIGNED',
'PositiveSmallIntegerField': 'smallint UNSIGNED',
'SlugField': 'varchar(%(max_length)s)',
'SmallAutoField': 'smallint AUTO_INCREMENT',
'SmallIntegerField': 'smallint',
'TextField': 'longtext',
'TimeField': 'time(6)',
'UUIDField': 'char(32)',
}
# For these data types:
# - MySQL < 8.0.13 and MariaDB < 10.2.1 don't accept default values and
# implicitly treat them as nullable
# - all versions of MySQL and MariaDB don't support full width database
# indexes
_limited_data_types = (
'tinyblob', 'blob', 'mediumblob', 'longblob', 'tinytext', 'text',
'mediumtext', 'longtext', 'json',
)
operators = {
'exact': '= %s',
'iexact': 'LIKE %s',
'contains': 'LIKE BINARY %s',
'icontains': 'LIKE %s',
'gt': '> %s',
'gte': '>= %s',
'lt': '< %s',
'lte': '<= %s',
'startswith': 'LIKE BINARY %s',
'endswith': 'LIKE BINARY %s',
'istartswith': 'LIKE %s',
'iendswith': 'LIKE %s',
}
# The patterns below are used to generate SQL pattern lookup clauses when
# the right-hand side of the lookup isn't a raw string (it might be an expression
# or the result of a bilateral transformation).
# In those cases, special characters for LIKE operators (e.g. \, *, _) should be
# escaped on database side.
#
# Note: we use str.format() here for readability as '%' is used as a wildcard for
# the LIKE operator.
pattern_esc = r"REPLACE(REPLACE(REPLACE({}, '\\', '\\\\'), '%%', '\%%'), '_', '\_')"
pattern_ops = {
'contains': "LIKE BINARY CONCAT('%%', {}, '%%')",
'icontains': "LIKE CONCAT('%%', {}, '%%')",
'startswith': "LIKE BINARY CONCAT({}, '%%')",
'istartswith': "LIKE CONCAT({}, '%%')",
'endswith': "LIKE BINARY CONCAT('%%', {})",
'iendswith': "LIKE CONCAT('%%', {})",
}
isolation_levels = {
'read uncommitted',
'read committed',
'repeatable read',
'serializable',
}
Database = Database
SchemaEditorClass = DatabaseSchemaEditor
# Classes instantiated in __init__().
client_class = DatabaseClient
creation_class = DatabaseCreation
features_class = DatabaseFeatures
introspection_class = DatabaseIntrospection
ops_class = DatabaseOperations
validation_class = DatabaseValidation
def get_connection_params(self):
kwargs = {
'conv': django_conversions,
'charset': 'utf8',
}
settings_dict = self.settings_dict
if settings_dict['USER']:
kwargs['user'] = settings_dict['USER']
if settings_dict['NAME']:
kwargs['db'] = settings_dict['NAME']
if settings_dict['PASSWORD']:
kwargs['passwd'] = settings_dict['PASSWORD']
if settings_dict['HOST'].startswith('/'):
kwargs['unix_socket'] = settings_dict['HOST']
elif settings_dict['HOST']:
kwargs['host'] = settings_dict['HOST']
if settings_dict['PORT']:
kwargs['port'] = int(settings_dict['PORT'])
# We need the number of potentially affected rows after an
# "UPDATE", not the number of changed rows.
kwargs['client_flag'] = CLIENT.FOUND_ROWS
# Validate the transaction isolation level, if specified.
options = settings_dict['OPTIONS'].copy()
isolation_level = options.pop('isolation_level', 'read committed')
if isolation_level:
isolation_level = isolation_level.lower()
if isolation_level not in self.isolation_levels:
raise ImproperlyConfigured(
"Invalid transaction isolation level '%s' specified.\n"
"Use one of %s, or None." % (
isolation_level,
', '.join("'%s'" % s for s in sorted(self.isolation_levels))
))
self.isolation_level = isolation_level
kwargs.update(options)
return kwargs
@async_unsafe
def get_new_connection(self, conn_params):
return Database.connect(**conn_params)
def init_connection_state(self):
assignments = []
if self.features.is_sql_auto_is_null_enabled:
# SQL_AUTO_IS_NULL controls whether an AUTO_INCREMENT column on
# a recently inserted row will return when the field is tested
# for NULL. Disabling this brings this aspect of MySQL in line
# with SQL standards.
assignments.append('SET SQL_AUTO_IS_NULL = 0')
if self.isolation_level:
assignments.append('SET SESSION TRANSACTION ISOLATION LEVEL %s' % self.isolation_level.upper())
if assignments:
with self.cursor() as cursor:
cursor.execute('; '.join(assignments))
@async_unsafe
def create_cursor(self, name=None):
cursor = self.connection.cursor()
return CursorWrapper(cursor)
def _rollback(self):
try:
BaseDatabaseWrapper._rollback(self)
except Database.NotSupportedError:
pass
def _set_autocommit(self, autocommit):
with self.wrap_database_errors:
self.connection.autocommit(autocommit)
def disable_constraint_checking(self):
"""
Disable foreign key checks, primarily for use in adding rows with
forward references. Always return True to indicate constraint checks
need to be re-enabled.
"""
self.cursor().execute('SET foreign_key_checks=0')
return True
def enable_constraint_checking(self):
"""
Re-enable foreign key checks after they have been disabled.
"""
# Override needs_rollback in case constraint_checks_disabled is
# nested inside transaction.atomic.
self.needs_rollback, needs_rollback = False, self.needs_rollback
try:
self.cursor().execute('SET foreign_key_checks=1')
finally:
self.needs_rollback = needs_rollback
def check_constraints(self, table_names=None):
"""
Check each table name in `table_names` for rows with invalid foreign
key references. This method is intended to be used in conjunction with
`disable_constraint_checking()` and `enable_constraint_checking()`, to
determine if rows with invalid references were entered while constraint
checks were off.
"""
with self.cursor() as cursor:
if table_names is None:
table_names = self.introspection.table_names(cursor)
for table_name in table_names:
primary_key_column_name = self.introspection.get_primary_key_column(cursor, table_name)
if not primary_key_column_name:
continue
key_columns = self.introspection.get_key_columns(cursor, table_name)
for column_name, referenced_table_name, referenced_column_name in key_columns:
cursor.execute(
"""
SELECT REFERRING.`%s`, REFERRING.`%s` FROM `%s` as REFERRING
LEFT JOIN `%s` as REFERRED
ON (REFERRING.`%s` = REFERRED.`%s`)
WHERE REFERRING.`%s` IS NOT NULL AND REFERRED.`%s` IS NULL
""" % (
primary_key_column_name, column_name, table_name,
referenced_table_name, column_name, referenced_column_name,
column_name, referenced_column_name,
)
)
for bad_row in cursor.fetchall():
raise IntegrityError(
"The row in table '%s' with primary key '%s' has an invalid "
"foreign key: %s.%s contains a value '%s' that does not "
"have a corresponding value in %s.%s."
% (
table_name, bad_row[0], table_name, column_name,
bad_row[1], referenced_table_name, referenced_column_name,
)
)
def is_usable(self):
try:
self.connection.ping()
except Database.Error:
return False
else:
return True
@cached_property
def display_name(self):
return 'MariaDB' if self.mysql_is_mariadb else 'MySQL'
@cached_property
def data_type_check_constraints(self):
if self.features.supports_column_check_constraints:
return {
'PositiveBigIntegerField': '`%(column)s` >= 0',
'PositiveIntegerField': '`%(column)s` >= 0',
'PositiveSmallIntegerField': '`%(column)s` >= 0',
}
return {}
@cached_property
def mysql_server_info(self):
with self.temporary_connection() as cursor:
cursor.execute('SELECT VERSION()')
return cursor.fetchone()[0]
@cached_property
def mysql_version(self):
match = server_version_re.match(self.mysql_server_info)
if not match:
raise Exception('Unable to determine MySQL version from version string %r' % self.mysql_server_info)
return tuple(int(x) for x in match.groups())
@cached_property
def mysql_is_mariadb(self):
return 'mariadb' in self.mysql_server_info.lower()
|
cf655a30401fb23611ffe9074158aa4ffb48d77ff666d303abe48aaf1b418e8d | import subprocess
import sys
from django.db.backends.base.creation import BaseDatabaseCreation
from .client import DatabaseClient
class DatabaseCreation(BaseDatabaseCreation):
def sql_table_creation_suffix(self):
suffix = []
test_settings = self.connection.settings_dict['TEST']
if test_settings['CHARSET']:
suffix.append('CHARACTER SET %s' % test_settings['CHARSET'])
if test_settings['COLLATION']:
suffix.append('COLLATE %s' % test_settings['COLLATION'])
return ' '.join(suffix)
def _execute_create_test_db(self, cursor, parameters, keepdb=False):
try:
super()._execute_create_test_db(cursor, parameters, keepdb)
except Exception as e:
if len(e.args) < 1 or e.args[0] != 1007:
# All errors except "database exists" (1007) cancel tests.
self.log('Got an error creating the test database: %s' % e)
sys.exit(2)
else:
raise
def _clone_test_db(self, suffix, verbosity, keepdb=False):
source_database_name = self.connection.settings_dict['NAME']
target_database_name = self.get_test_db_clone_settings(suffix)['NAME']
test_db_params = {
'dbname': self.connection.ops.quote_name(target_database_name),
'suffix': self.sql_table_creation_suffix(),
}
with self._nodb_connection.cursor() as cursor:
try:
self._execute_create_test_db(cursor, test_db_params, keepdb)
except Exception:
if keepdb:
# If the database should be kept, skip everything else.
return
try:
if verbosity >= 1:
self.log('Destroying old test database for alias %s...' % (
self._get_database_display_str(verbosity, target_database_name),
))
cursor.execute('DROP DATABASE %(dbname)s' % test_db_params)
self._execute_create_test_db(cursor, test_db_params, keepdb)
except Exception as e:
self.log('Got an error recreating the test database: %s' % e)
sys.exit(2)
self._clone_db(source_database_name, target_database_name)
def _clone_db(self, source_database_name, target_database_name):
dump_args = DatabaseClient.settings_to_cmd_args(self.connection.settings_dict)[1:]
dump_cmd = ['mysqldump', *dump_args[:-1], '--routines', '--events', source_database_name]
load_cmd = DatabaseClient.settings_to_cmd_args(self.connection.settings_dict)
load_cmd[-1] = target_database_name
with subprocess.Popen(dump_cmd, stdout=subprocess.PIPE) as dump_proc:
with subprocess.Popen(load_cmd, stdin=dump_proc.stdout, stdout=subprocess.DEVNULL):
# Allow dump_proc to receive a SIGPIPE if the load process exits.
dump_proc.stdout.close()
|
ab6c764cdb82d35745f08eac3769d07c7070afe9adf7ed0d2dfa68779d09565e | import operator
from django.db import InterfaceError
from django.db.backends.base.features import BaseDatabaseFeatures
from django.utils.functional import cached_property
class DatabaseFeatures(BaseDatabaseFeatures):
allows_group_by_selected_pks = True
can_return_columns_from_insert = True
can_return_rows_from_bulk_insert = True
has_real_datatype = True
has_native_uuid_field = True
has_native_duration_field = True
can_defer_constraint_checks = True
has_select_for_update = True
has_select_for_update_nowait = True
has_select_for_update_of = True
has_select_for_update_skip_locked = True
can_release_savepoints = True
supports_tablespaces = True
supports_transactions = True
can_introspect_autofield = True
can_introspect_ip_address_field = True
can_introspect_materialized_views = True
can_introspect_small_integer_field = True
can_distinct_on_fields = True
can_rollback_ddl = True
supports_combined_alters = True
nulls_order_largest = True
closed_cursor_error_class = InterfaceError
has_case_insensitive_like = False
greatest_least_ignores_nulls = True
can_clone_databases = True
supports_temporal_subtraction = True
supports_slicing_ordering_in_compound = True
create_test_procedure_without_params_sql = """
CREATE FUNCTION test_procedure () RETURNS void AS $$
DECLARE
V_I INTEGER;
BEGIN
V_I := 1;
END;
$$ LANGUAGE plpgsql;"""
create_test_procedure_with_int_param_sql = """
CREATE FUNCTION test_procedure (P_I INTEGER) RETURNS void AS $$
DECLARE
V_I INTEGER;
BEGIN
V_I := P_I;
END;
$$ LANGUAGE plpgsql;"""
requires_casted_case_in_updates = True
supports_over_clause = True
only_supports_unbounded_with_preceding_and_following = True
supports_aggregate_filter_clause = True
supported_explain_formats = {'JSON', 'TEXT', 'XML', 'YAML'}
validates_explain_options = False # A query will error on invalid options.
@cached_property
def is_postgresql_9_6(self):
return self.connection.pg_version >= 90600
@cached_property
def is_postgresql_10(self):
return self.connection.pg_version >= 100000
@cached_property
def is_postgresql_11(self):
return self.connection.pg_version >= 110000
@cached_property
def is_postgresql_12(self):
return self.connection.pg_version >= 120000
has_bloom_index = property(operator.attrgetter('is_postgresql_9_6'))
has_brin_autosummarize = property(operator.attrgetter('is_postgresql_10'))
has_phraseto_tsquery = property(operator.attrgetter('is_postgresql_9_6'))
has_websearch_to_tsquery = property(operator.attrgetter('is_postgresql_11'))
supports_table_partitions = property(operator.attrgetter('is_postgresql_10'))
|
e61761e02123650cdbc6ab716173f3041dda13826739b2c4743d8d3b39d288e1 | from django.db.backends.base.introspection import (
BaseDatabaseIntrospection, FieldInfo, TableInfo,
)
from django.db.models import Index
class DatabaseIntrospection(BaseDatabaseIntrospection):
# Maps type codes to Django Field types.
data_types_reverse = {
16: 'BooleanField',
17: 'BinaryField',
20: 'BigIntegerField',
21: 'SmallIntegerField',
23: 'IntegerField',
25: 'TextField',
700: 'FloatField',
701: 'FloatField',
869: 'GenericIPAddressField',
1042: 'CharField', # blank-padded
1043: 'CharField',
1082: 'DateField',
1083: 'TimeField',
1114: 'DateTimeField',
1184: 'DateTimeField',
1186: 'DurationField',
1266: 'TimeField',
1700: 'DecimalField',
2950: 'UUIDField',
}
ignored_tables = []
def get_field_type(self, data_type, description):
field_type = super().get_field_type(data_type, description)
if description.default and 'nextval' in description.default:
if field_type == 'IntegerField':
return 'AutoField'
elif field_type == 'BigIntegerField':
return 'BigAutoField'
elif field_type == 'SmallIntegerField':
return 'SmallAutoField'
return field_type
def get_table_list(self, cursor):
"""Return a list of table and view names in the current database."""
cursor.execute("""
SELECT c.relname,
CASE WHEN {} THEN 'p' WHEN c.relkind IN ('m', 'v') THEN 'v' ELSE 't' END
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN ('f', 'm', 'p', 'r', 'v')
AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
AND pg_catalog.pg_table_is_visible(c.oid)
""".format('c.relispartition' if self.connection.features.supports_table_partitions else 'FALSE'))
return [TableInfo(*row) for row in cursor.fetchall() if row[0] not in self.ignored_tables]
def get_table_description(self, cursor, table_name):
"""
Return a description of the table with the DB-API cursor.description
interface.
"""
# Query the pg_catalog tables as cursor.description does not reliably
# return the nullable property and information_schema.columns does not
# contain details of materialized views.
cursor.execute("""
SELECT
a.attname AS column_name,
NOT (a.attnotnull OR (t.typtype = 'd' AND t.typnotnull)) AS is_nullable,
pg_get_expr(ad.adbin, ad.adrelid) AS column_default
FROM pg_attribute a
LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
JOIN pg_type t ON a.atttypid = t.oid
JOIN pg_class c ON a.attrelid = c.oid
JOIN pg_namespace n ON c.relnamespace = n.oid
WHERE c.relkind IN ('f', 'm', 'p', 'r', 'v')
AND c.relname = %s
AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
AND pg_catalog.pg_table_is_visible(c.oid)
""", [table_name])
field_map = {line[0]: line[1:] for line in cursor.fetchall()}
cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name))
return [
FieldInfo(
line.name,
line.type_code,
line.display_size,
line.internal_size,
line.precision,
line.scale,
*field_map[line.name],
)
for line in cursor.description
]
def get_sequences(self, cursor, table_name, table_fields=()):
cursor.execute("""
SELECT s.relname as sequence_name, col.attname
FROM pg_class s
JOIN pg_namespace sn ON sn.oid = s.relnamespace
JOIN pg_depend d ON d.refobjid = s.oid AND d.refclassid = 'pg_class'::regclass
JOIN pg_attrdef ad ON ad.oid = d.objid AND d.classid = 'pg_attrdef'::regclass
JOIN pg_attribute col ON col.attrelid = ad.adrelid AND col.attnum = ad.adnum
JOIN pg_class tbl ON tbl.oid = ad.adrelid
WHERE s.relkind = 'S'
AND d.deptype in ('a', 'n')
AND pg_catalog.pg_table_is_visible(tbl.oid)
AND tbl.relname = %s
""", [table_name])
return [
{'name': row[0], 'table': table_name, 'column': row[1]}
for row in cursor.fetchall()
]
def get_relations(self, cursor, table_name):
"""
Return a dictionary of {field_name: (field_name_other_table, other_table)}
representing all relationships to the given table.
"""
return {row[0]: (row[2], row[1]) for row in self.get_key_columns(cursor, table_name)}
def get_key_columns(self, cursor, table_name):
cursor.execute("""
SELECT a1.attname, c2.relname, a2.attname
FROM pg_constraint con
LEFT JOIN pg_class c1 ON con.conrelid = c1.oid
LEFT JOIN pg_class c2 ON con.confrelid = c2.oid
LEFT JOIN pg_attribute a1 ON c1.oid = a1.attrelid AND a1.attnum = con.conkey[1]
LEFT JOIN pg_attribute a2 ON c2.oid = a2.attrelid AND a2.attnum = con.confkey[1]
WHERE
c1.relname = %s AND
con.contype = 'f' AND
c1.relnamespace = c2.relnamespace AND
pg_catalog.pg_table_is_visible(c1.oid)
""", [table_name])
return cursor.fetchall()
def get_constraints(self, cursor, table_name):
"""
Retrieve any constraints or keys (unique, pk, fk, check, index) across
one or more columns. Also retrieve the definition of expression-based
indexes.
"""
constraints = {}
# Loop over the key table, collecting things as constraints. The column
# array must return column names in the same order in which they were
# created.
cursor.execute("""
SELECT
c.conname,
array(
SELECT attname
FROM unnest(c.conkey) WITH ORDINALITY cols(colid, arridx)
JOIN pg_attribute AS ca ON cols.colid = ca.attnum
WHERE ca.attrelid = c.conrelid
ORDER BY cols.arridx
),
c.contype,
(SELECT fkc.relname || '.' || fka.attname
FROM pg_attribute AS fka
JOIN pg_class AS fkc ON fka.attrelid = fkc.oid
WHERE fka.attrelid = c.confrelid AND fka.attnum = c.confkey[1]),
cl.reloptions
FROM pg_constraint AS c
JOIN pg_class AS cl ON c.conrelid = cl.oid
WHERE cl.relname = %s AND pg_catalog.pg_table_is_visible(cl.oid)
""", [table_name])
for constraint, columns, kind, used_cols, options in cursor.fetchall():
constraints[constraint] = {
"columns": columns,
"primary_key": kind == "p",
"unique": kind in ["p", "u"],
"foreign_key": tuple(used_cols.split(".", 1)) if kind == "f" else None,
"check": kind == "c",
"index": False,
"definition": None,
"options": options,
}
# Now get indexes
cursor.execute("""
SELECT
indexname, array_agg(attname ORDER BY arridx), indisunique, indisprimary,
array_agg(ordering ORDER BY arridx), amname, exprdef, s2.attoptions
FROM (
SELECT
c2.relname as indexname, idx.*, attr.attname, am.amname,
CASE
WHEN idx.indexprs IS NOT NULL THEN
pg_get_indexdef(idx.indexrelid)
END AS exprdef,
CASE am.amname
WHEN 'btree' THEN
CASE (option & 1)
WHEN 1 THEN 'DESC' ELSE 'ASC'
END
END as ordering,
c2.reloptions as attoptions
FROM (
SELECT *
FROM pg_index i, unnest(i.indkey, i.indoption) WITH ORDINALITY koi(key, option, arridx)
) idx
LEFT JOIN pg_class c ON idx.indrelid = c.oid
LEFT JOIN pg_class c2 ON idx.indexrelid = c2.oid
LEFT JOIN pg_am am ON c2.relam = am.oid
LEFT JOIN pg_attribute attr ON attr.attrelid = c.oid AND attr.attnum = idx.key
WHERE c.relname = %s AND pg_catalog.pg_table_is_visible(c.oid)
) s2
GROUP BY indexname, indisunique, indisprimary, amname, exprdef, attoptions;
""", [table_name])
for index, columns, unique, primary, orders, type_, definition, options in cursor.fetchall():
if index not in constraints:
basic_index = type_ == 'btree' and not index.endswith('_btree') and options is None
constraints[index] = {
"columns": columns if columns != [None] else [],
"orders": orders if orders != [None] else [],
"primary_key": primary,
"unique": unique,
"foreign_key": None,
"check": False,
"index": True,
"type": Index.suffix if basic_index else type_,
"definition": definition,
"options": options,
}
return constraints
|
dbb5db51f2d4054074cb7634f0c979303a178ecfa90d946ebb9c9569269abd5e | """
PostgreSQL database backend for Django.
Requires psycopg 2: https://www.psycopg.org/
"""
import asyncio
import threading
import warnings
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.db import DatabaseError as WrappedDatabaseError, connections
from django.db.backends.base.base import BaseDatabaseWrapper
from django.db.backends.utils import (
CursorDebugWrapper as BaseCursorDebugWrapper,
)
from django.utils.asyncio import async_unsafe
from django.utils.functional import cached_property
from django.utils.safestring import SafeString
from django.utils.version import get_version_tuple
try:
import psycopg2 as Database
import psycopg2.extensions
import psycopg2.extras
except ImportError as e:
raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
def psycopg2_version():
version = psycopg2.__version__.split(' ', 1)[0]
return get_version_tuple(version)
PSYCOPG2_VERSION = psycopg2_version()
if PSYCOPG2_VERSION < (2, 5, 4):
raise ImproperlyConfigured("psycopg2_version 2.5.4 or newer is required; you have %s" % psycopg2.__version__)
# Some of these import psycopg2, so import them after checking if it's installed.
from .client import DatabaseClient # NOQA isort:skip
from .creation import DatabaseCreation # NOQA isort:skip
from .features import DatabaseFeatures # NOQA isort:skip
from .introspection import DatabaseIntrospection # NOQA isort:skip
from .operations import DatabaseOperations # NOQA isort:skip
from .schema import DatabaseSchemaEditor # NOQA isort:skip
psycopg2.extensions.register_adapter(SafeString, psycopg2.extensions.QuotedString)
psycopg2.extras.register_uuid()
# Register support for inet[] manually so we don't have to handle the Inet()
# object on load all the time.
INETARRAY_OID = 1041
INETARRAY = psycopg2.extensions.new_array_type(
(INETARRAY_OID,),
'INETARRAY',
psycopg2.extensions.UNICODE,
)
psycopg2.extensions.register_type(INETARRAY)
class DatabaseWrapper(BaseDatabaseWrapper):
vendor = 'postgresql'
display_name = 'PostgreSQL'
# This dictionary maps Field objects to their associated PostgreSQL column
# types, as strings. Column-type strings can contain format strings; they'll
# be interpolated against the values of Field.__dict__ before being output.
# If a column type is set to None, it won't be included in the output.
data_types = {
'AutoField': 'serial',
'BigAutoField': 'bigserial',
'BinaryField': 'bytea',
'BooleanField': 'boolean',
'CharField': 'varchar(%(max_length)s)',
'DateField': 'date',
'DateTimeField': 'timestamp with time zone',
'DecimalField': 'numeric(%(max_digits)s, %(decimal_places)s)',
'DurationField': 'interval',
'FileField': 'varchar(%(max_length)s)',
'FilePathField': 'varchar(%(max_length)s)',
'FloatField': 'double precision',
'IntegerField': 'integer',
'BigIntegerField': 'bigint',
'IPAddressField': 'inet',
'GenericIPAddressField': 'inet',
'NullBooleanField': 'boolean',
'OneToOneField': 'integer',
'PositiveBigIntegerField': 'bigint',
'PositiveIntegerField': 'integer',
'PositiveSmallIntegerField': 'smallint',
'SlugField': 'varchar(%(max_length)s)',
'SmallAutoField': 'smallserial',
'SmallIntegerField': 'smallint',
'TextField': 'text',
'TimeField': 'time',
'UUIDField': 'uuid',
}
data_type_check_constraints = {
'PositiveBigIntegerField': '"%(column)s" >= 0',
'PositiveIntegerField': '"%(column)s" >= 0',
'PositiveSmallIntegerField': '"%(column)s" >= 0',
}
operators = {
'exact': '= %s',
'iexact': '= UPPER(%s)',
'contains': 'LIKE %s',
'icontains': 'LIKE UPPER(%s)',
'regex': '~ %s',
'iregex': '~* %s',
'gt': '> %s',
'gte': '>= %s',
'lt': '< %s',
'lte': '<= %s',
'startswith': 'LIKE %s',
'endswith': 'LIKE %s',
'istartswith': 'LIKE UPPER(%s)',
'iendswith': 'LIKE UPPER(%s)',
}
# The patterns below are used to generate SQL pattern lookup clauses when
# the right-hand side of the lookup isn't a raw string (it might be an expression
# or the result of a bilateral transformation).
# In those cases, special characters for LIKE operators (e.g. \, *, _) should be
# escaped on database side.
#
# Note: we use str.format() here for readability as '%' is used as a wildcard for
# the LIKE operator.
pattern_esc = r"REPLACE(REPLACE(REPLACE({}, E'\\', E'\\\\'), E'%%', E'\\%%'), E'_', E'\\_')"
pattern_ops = {
'contains': "LIKE '%%' || {} || '%%'",
'icontains': "LIKE '%%' || UPPER({}) || '%%'",
'startswith': "LIKE {} || '%%'",
'istartswith': "LIKE UPPER({}) || '%%'",
'endswith': "LIKE '%%' || {}",
'iendswith': "LIKE '%%' || UPPER({})",
}
Database = Database
SchemaEditorClass = DatabaseSchemaEditor
# Classes instantiated in __init__().
client_class = DatabaseClient
creation_class = DatabaseCreation
features_class = DatabaseFeatures
introspection_class = DatabaseIntrospection
ops_class = DatabaseOperations
# PostgreSQL backend-specific attributes.
_named_cursor_idx = 0
def get_connection_params(self):
settings_dict = self.settings_dict
# None may be used to connect to the default 'postgres' db
if settings_dict['NAME'] == '':
raise ImproperlyConfigured(
"settings.DATABASES is improperly configured. "
"Please supply the NAME value.")
if len(settings_dict['NAME'] or '') > self.ops.max_name_length():
raise ImproperlyConfigured(
"The database name '%s' (%d characters) is longer than "
"PostgreSQL's limit of %d characters. Supply a shorter NAME "
"in settings.DATABASES." % (
settings_dict['NAME'],
len(settings_dict['NAME']),
self.ops.max_name_length(),
)
)
conn_params = {
'database': settings_dict['NAME'] or 'postgres',
**settings_dict['OPTIONS'],
}
conn_params.pop('isolation_level', None)
if settings_dict['USER']:
conn_params['user'] = settings_dict['USER']
if settings_dict['PASSWORD']:
conn_params['password'] = settings_dict['PASSWORD']
if settings_dict['HOST']:
conn_params['host'] = settings_dict['HOST']
if settings_dict['PORT']:
conn_params['port'] = settings_dict['PORT']
return conn_params
@async_unsafe
def get_new_connection(self, conn_params):
connection = Database.connect(**conn_params)
# self.isolation_level must be set:
# - after connecting to the database in order to obtain the database's
# default when no value is explicitly specified in options.
# - before calling _set_autocommit() because if autocommit is on, that
# will set connection.isolation_level to ISOLATION_LEVEL_AUTOCOMMIT.
options = self.settings_dict['OPTIONS']
try:
self.isolation_level = options['isolation_level']
except KeyError:
self.isolation_level = connection.isolation_level
else:
# Set the isolation level to the value from OPTIONS.
if self.isolation_level != connection.isolation_level:
connection.set_session(isolation_level=self.isolation_level)
return connection
def ensure_timezone(self):
if self.connection is None:
return False
conn_timezone_name = self.connection.get_parameter_status('TimeZone')
timezone_name = self.timezone_name
if timezone_name and conn_timezone_name != timezone_name:
with self.connection.cursor() as cursor:
cursor.execute(self.ops.set_time_zone_sql(), [timezone_name])
return True
return False
def init_connection_state(self):
self.connection.set_client_encoding('UTF8')
timezone_changed = self.ensure_timezone()
if timezone_changed:
# Commit after setting the time zone (see #17062)
if not self.get_autocommit():
self.connection.commit()
@async_unsafe
def create_cursor(self, name=None):
if name:
# In autocommit mode, the cursor will be used outside of a
# transaction, hence use a holdable cursor.
cursor = self.connection.cursor(name, scrollable=False, withhold=self.connection.autocommit)
else:
cursor = self.connection.cursor()
cursor.tzinfo_factory = self.tzinfo_factory if settings.USE_TZ else None
return cursor
def tzinfo_factory(self, offset):
return self.timezone
@async_unsafe
def chunked_cursor(self):
self._named_cursor_idx += 1
# Get the current async task
# Note that right now this is behind @async_unsafe, so this is
# unreachable, but in future we'll start loosening this restriction.
# For now, it's here so that every use of "threading" is
# also async-compatible.
try:
if hasattr(asyncio, 'current_task'):
# Python 3.7 and up
current_task = asyncio.current_task()
else:
# Python 3.6
current_task = asyncio.Task.current_task()
except RuntimeError:
current_task = None
# Current task can be none even if the current_task call didn't error
if current_task:
task_ident = str(id(current_task))
else:
task_ident = 'sync'
# Use that and the thread ident to get a unique name
return self._cursor(
name='_django_curs_%d_%s_%d' % (
# Avoid reusing name in other threads / tasks
threading.current_thread().ident,
task_ident,
self._named_cursor_idx,
)
)
def _set_autocommit(self, autocommit):
with self.wrap_database_errors:
self.connection.autocommit = autocommit
def check_constraints(self, table_names=None):
"""
Check constraints by setting them to immediate. Return them to deferred
afterward.
"""
self.cursor().execute('SET CONSTRAINTS ALL IMMEDIATE')
self.cursor().execute('SET CONSTRAINTS ALL DEFERRED')
def is_usable(self):
try:
# Use a psycopg cursor directly, bypassing Django's utilities.
self.connection.cursor().execute("SELECT 1")
except Database.Error:
return False
else:
return True
@property
def _nodb_connection(self):
nodb_connection = super()._nodb_connection
try:
nodb_connection.ensure_connection()
except (Database.DatabaseError, WrappedDatabaseError):
warnings.warn(
"Normally Django will use a connection to the 'postgres' database "
"to avoid running initialization queries against the production "
"database when it's not needed (for example, when running tests). "
"Django was unable to create a connection to the 'postgres' database "
"and will use the first PostgreSQL database instead.",
RuntimeWarning
)
for connection in connections.all():
if connection.vendor == 'postgresql' and connection.settings_dict['NAME'] != 'postgres':
return self.__class__(
{**self.settings_dict, 'NAME': connection.settings_dict['NAME']},
alias=self.alias,
)
return nodb_connection
@cached_property
def pg_version(self):
with self.temporary_connection():
return self.connection.server_version
def make_debug_cursor(self, cursor):
return CursorDebugWrapper(cursor, self)
class CursorDebugWrapper(BaseCursorDebugWrapper):
def copy_expert(self, sql, file, *args):
with self.debug_sql(sql):
return self.cursor.copy_expert(sql, file, *args)
def copy_to(self, file, table, *args, **kwargs):
with self.debug_sql(sql='COPY %s TO STDOUT' % table):
return self.cursor.copy_to(file, table, *args, **kwargs)
|
cbad5692a71e70d5cd03b6f78bff1686e1c06a00327b2eacce8f9fae94b3be44 | from psycopg2.extras import Inet
from django.conf import settings
from django.db.backends.base.operations import BaseDatabaseOperations
class DatabaseOperations(BaseDatabaseOperations):
cast_char_field_without_max_length = 'varchar'
explain_prefix = 'EXPLAIN'
cast_data_types = {
'AutoField': 'integer',
'BigAutoField': 'bigint',
'SmallAutoField': 'smallint',
}
def unification_cast_sql(self, output_field):
internal_type = output_field.get_internal_type()
if internal_type in ("GenericIPAddressField", "IPAddressField", "TimeField", "UUIDField"):
# PostgreSQL will resolve a union as type 'text' if input types are
# 'unknown'.
# https://www.postgresql.org/docs/current/typeconv-union-case.html
# These fields cannot be implicitly cast back in the default
# PostgreSQL configuration so we need to explicitly cast them.
# We must also remove components of the type within brackets:
# varchar(255) -> varchar.
return 'CAST(%%s AS %s)' % output_field.db_type(self.connection).split('(')[0]
return '%s'
def date_extract_sql(self, lookup_type, field_name):
# https://www.postgresql.org/docs/current/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
if lookup_type == 'week_day':
# For consistency across backends, we return Sunday=1, Saturday=7.
return "EXTRACT('dow' FROM %s) + 1" % field_name
elif lookup_type == 'iso_week_day':
return "EXTRACT('isodow' FROM %s)" % field_name
elif lookup_type == 'iso_year':
return "EXTRACT('isoyear' FROM %s)" % field_name
else:
return "EXTRACT('%s' FROM %s)" % (lookup_type, field_name)
def date_trunc_sql(self, lookup_type, field_name):
# https://www.postgresql.org/docs/current/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
def _prepare_tzname_delta(self, tzname):
if '+' in tzname:
return tzname.replace('+', '-')
elif '-' in tzname:
return tzname.replace('-', '+')
return tzname
def _convert_field_to_tz(self, field_name, tzname):
if settings.USE_TZ:
field_name = "%s AT TIME ZONE '%s'" % (field_name, self._prepare_tzname_delta(tzname))
return field_name
def datetime_cast_date_sql(self, field_name, tzname):
field_name = self._convert_field_to_tz(field_name, tzname)
return '(%s)::date' % field_name
def datetime_cast_time_sql(self, field_name, tzname):
field_name = self._convert_field_to_tz(field_name, tzname)
return '(%s)::time' % field_name
def datetime_extract_sql(self, lookup_type, field_name, tzname):
field_name = self._convert_field_to_tz(field_name, tzname)
return self.date_extract_sql(lookup_type, field_name)
def datetime_trunc_sql(self, lookup_type, field_name, tzname):
field_name = self._convert_field_to_tz(field_name, tzname)
# https://www.postgresql.org/docs/current/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
def time_trunc_sql(self, lookup_type, field_name):
return "DATE_TRUNC('%s', %s)::time" % (lookup_type, field_name)
def deferrable_sql(self):
return " DEFERRABLE INITIALLY DEFERRED"
def fetch_returned_insert_rows(self, cursor):
"""
Given a cursor object that has just performed an INSERT...RETURNING
statement into a table, return the tuple of returned data.
"""
return cursor.fetchall()
def lookup_cast(self, lookup_type, internal_type=None):
lookup = '%s'
# Cast text lookups to text to allow things like filter(x__contains=4)
if lookup_type in ('iexact', 'contains', 'icontains', 'startswith',
'istartswith', 'endswith', 'iendswith', 'regex', 'iregex'):
if internal_type in ('IPAddressField', 'GenericIPAddressField'):
lookup = "HOST(%s)"
elif internal_type in ('CICharField', 'CIEmailField', 'CITextField'):
lookup = '%s::citext'
else:
lookup = "%s::text"
# Use UPPER(x) for case-insensitive lookups; it's faster.
if lookup_type in ('iexact', 'icontains', 'istartswith', 'iendswith'):
lookup = 'UPPER(%s)' % lookup
return lookup
def no_limit_value(self):
return None
def prepare_sql_script(self, sql):
return [sql]
def quote_name(self, name):
if name.startswith('"') and name.endswith('"'):
return name # Quoting once is enough.
return '"%s"' % name
def set_time_zone_sql(self):
return "SET TIME ZONE %s"
def sql_flush(self, style, tables, sequences, allow_cascade=False):
if tables:
# Perform a single SQL 'TRUNCATE x, y, z...;' statement. It allows
# us to truncate tables referenced by a foreign key in any other
# table.
tables_sql = ', '.join(
style.SQL_FIELD(self.quote_name(table)) for table in tables)
if allow_cascade:
sql = ['%s %s %s;' % (
style.SQL_KEYWORD('TRUNCATE'),
tables_sql,
style.SQL_KEYWORD('CASCADE'),
)]
else:
sql = ['%s %s;' % (
style.SQL_KEYWORD('TRUNCATE'),
tables_sql,
)]
sql.extend(self.sequence_reset_by_name_sql(style, sequences))
return sql
else:
return []
def sequence_reset_by_name_sql(self, style, sequences):
# 'ALTER SEQUENCE sequence_name RESTART WITH 1;'... style SQL statements
# to reset sequence indices
sql = []
for sequence_info in sequences:
table_name = sequence_info['table']
# 'id' will be the case if it's an m2m using an autogenerated
# intermediate table (see BaseDatabaseIntrospection.sequence_list).
column_name = sequence_info['column'] or 'id'
sql.append("%s setval(pg_get_serial_sequence('%s','%s'), 1, false);" % (
style.SQL_KEYWORD('SELECT'),
style.SQL_TABLE(self.quote_name(table_name)),
style.SQL_FIELD(column_name),
))
return sql
def tablespace_sql(self, tablespace, inline=False):
if inline:
return "USING INDEX TABLESPACE %s" % self.quote_name(tablespace)
else:
return "TABLESPACE %s" % self.quote_name(tablespace)
def sequence_reset_sql(self, style, model_list):
from django.db import models
output = []
qn = self.quote_name
for model in model_list:
# Use `coalesce` to set the sequence for each model to the max pk value if there are records,
# or 1 if there are none. Set the `is_called` property (the third argument to `setval`) to true
# if there are records (as the max pk value is already in use), otherwise set it to false.
# Use pg_get_serial_sequence to get the underlying sequence name from the table name
# and column name (available since PostgreSQL 8)
for f in model._meta.local_fields:
if isinstance(f, models.AutoField):
output.append(
"%s setval(pg_get_serial_sequence('%s','%s'), "
"coalesce(max(%s), 1), max(%s) %s null) %s %s;" % (
style.SQL_KEYWORD('SELECT'),
style.SQL_TABLE(qn(model._meta.db_table)),
style.SQL_FIELD(f.column),
style.SQL_FIELD(qn(f.column)),
style.SQL_FIELD(qn(f.column)),
style.SQL_KEYWORD('IS NOT'),
style.SQL_KEYWORD('FROM'),
style.SQL_TABLE(qn(model._meta.db_table)),
)
)
break # Only one AutoField is allowed per model, so don't bother continuing.
for f in model._meta.many_to_many:
if not f.remote_field.through:
output.append(
"%s setval(pg_get_serial_sequence('%s','%s'), "
"coalesce(max(%s), 1), max(%s) %s null) %s %s;" % (
style.SQL_KEYWORD('SELECT'),
style.SQL_TABLE(qn(f.m2m_db_table())),
style.SQL_FIELD('id'),
style.SQL_FIELD(qn('id')),
style.SQL_FIELD(qn('id')),
style.SQL_KEYWORD('IS NOT'),
style.SQL_KEYWORD('FROM'),
style.SQL_TABLE(qn(f.m2m_db_table()))
)
)
return output
def prep_for_iexact_query(self, x):
return x
def max_name_length(self):
"""
Return the maximum length of an identifier.
The maximum length of an identifier is 63 by default, but can be
changed by recompiling PostgreSQL after editing the NAMEDATALEN
macro in src/include/pg_config_manual.h.
This implementation returns 63, but can be overridden by a custom
database backend that inherits most of its behavior from this one.
"""
return 63
def distinct_sql(self, fields, params):
if fields:
params = [param for param_list in params for param in param_list]
return (['DISTINCT ON (%s)' % ', '.join(fields)], params)
else:
return ['DISTINCT'], []
def last_executed_query(self, cursor, sql, params):
# https://www.psycopg.org/docs/cursor.html#cursor.query
# The query attribute is a Psycopg extension to the DB API 2.0.
if cursor.query is not None:
return cursor.query.decode()
return None
def return_insert_columns(self, fields):
if not fields:
return '', ()
columns = [
'%s.%s' % (
self.quote_name(field.model._meta.db_table),
self.quote_name(field.column),
) for field in fields
]
return 'RETURNING %s' % ', '.join(columns), ()
def bulk_insert_sql(self, fields, placeholder_rows):
placeholder_rows_sql = (", ".join(row) for row in placeholder_rows)
values_sql = ", ".join("(%s)" % sql for sql in placeholder_rows_sql)
return "VALUES " + values_sql
def adapt_datefield_value(self, value):
return value
def adapt_datetimefield_value(self, value):
return value
def adapt_timefield_value(self, value):
return value
def adapt_ipaddressfield_value(self, value):
if value:
return Inet(value)
return None
def subtract_temporals(self, internal_type, lhs, rhs):
if internal_type == 'DateField':
lhs_sql, lhs_params = lhs
rhs_sql, rhs_params = rhs
params = (*lhs_params, *rhs_params)
return "(interval '1 day' * (%s - %s))" % (lhs_sql, rhs_sql), params
return super().subtract_temporals(internal_type, lhs, rhs)
def explain_query_prefix(self, format=None, **options):
prefix = super().explain_query_prefix(format)
extra = {}
if format:
extra['FORMAT'] = format
if options:
extra.update({
name.upper(): 'true' if value else 'false'
for name, value in options.items()
})
if extra:
prefix += ' (%s)' % ', '.join('%s %s' % i for i in extra.items())
return prefix
def ignore_conflicts_suffix_sql(self, ignore_conflicts=None):
return 'ON CONFLICT DO NOTHING' if ignore_conflicts else super().ignore_conflicts_suffix_sql(ignore_conflicts)
|
5b9dd79a161cc03b862b7132d7771d7ecf6a12f039cc5dbc6e76de53e09f200c | import sys
from psycopg2 import errorcodes
from django.db.backends.base.creation import BaseDatabaseCreation
from django.db.backends.utils import strip_quotes
class DatabaseCreation(BaseDatabaseCreation):
def _quote_name(self, name):
return self.connection.ops.quote_name(name)
def _get_database_create_suffix(self, encoding=None, template=None):
suffix = ""
if encoding:
suffix += " ENCODING '{}'".format(encoding)
if template:
suffix += " TEMPLATE {}".format(self._quote_name(template))
return suffix and "WITH" + suffix
def sql_table_creation_suffix(self):
test_settings = self.connection.settings_dict['TEST']
assert test_settings['COLLATION'] is None, (
"PostgreSQL does not support collation setting at database creation time."
)
return self._get_database_create_suffix(
encoding=test_settings['CHARSET'],
template=test_settings.get('TEMPLATE'),
)
def _database_exists(self, cursor, database_name):
cursor.execute('SELECT 1 FROM pg_catalog.pg_database WHERE datname = %s', [strip_quotes(database_name)])
return cursor.fetchone() is not None
def _execute_create_test_db(self, cursor, parameters, keepdb=False):
try:
if keepdb and self._database_exists(cursor, parameters['dbname']):
# If the database should be kept and it already exists, don't
# try to create a new one.
return
super()._execute_create_test_db(cursor, parameters, keepdb)
except Exception as e:
if getattr(e.__cause__, 'pgcode', '') != errorcodes.DUPLICATE_DATABASE:
# All errors except "database already exists" cancel tests.
self.log('Got an error creating the test database: %s' % e)
sys.exit(2)
elif not keepdb:
# If the database should be kept, ignore "database already
# exists".
raise
def _clone_test_db(self, suffix, verbosity, keepdb=False):
# CREATE DATABASE ... WITH TEMPLATE ... requires closing connections
# to the template database.
self.connection.close()
source_database_name = self.connection.settings_dict['NAME']
target_database_name = self.get_test_db_clone_settings(suffix)['NAME']
test_db_params = {
'dbname': self._quote_name(target_database_name),
'suffix': self._get_database_create_suffix(template=source_database_name),
}
with self._nodb_connection.cursor() as cursor:
try:
self._execute_create_test_db(cursor, test_db_params, keepdb)
except Exception:
try:
if verbosity >= 1:
self.log('Destroying old test database for alias %s...' % (
self._get_database_display_str(verbosity, target_database_name),
))
cursor.execute('DROP DATABASE %(dbname)s' % test_db_params)
self._execute_create_test_db(cursor, test_db_params, keepdb)
except Exception as e:
self.log('Got an error cloning the test database: %s' % e)
sys.exit(2)
|
7720b5b00f06979ef39d82529f5604f6ccc1108564385544c8ef02eb5794631a | import re
from collections import namedtuple
import sqlparse
from django.db.backends.base.introspection import (
BaseDatabaseIntrospection, FieldInfo as BaseFieldInfo, TableInfo,
)
from django.db.models import Index
from django.utils.regex_helper import _lazy_re_compile
FieldInfo = namedtuple('FieldInfo', BaseFieldInfo._fields + ('pk',))
field_size_re = _lazy_re_compile(r'^\s*(?:var)?char\s*\(\s*(\d+)\s*\)\s*$')
def get_field_size(name):
""" Extract the size number from a "varchar(11)" type name """
m = field_size_re.search(name)
return int(m.group(1)) if m else None
# This light wrapper "fakes" a dictionary interface, because some SQLite data
# types include variables in them -- e.g. "varchar(30)" -- and can't be matched
# as a simple dictionary lookup.
class FlexibleFieldLookupDict:
# Maps SQL types to Django Field types. Some of the SQL types have multiple
# entries here because SQLite allows for anything and doesn't normalize the
# field type; it uses whatever was given.
base_data_types_reverse = {
'bool': 'BooleanField',
'boolean': 'BooleanField',
'smallint': 'SmallIntegerField',
'smallint unsigned': 'PositiveSmallIntegerField',
'smallinteger': 'SmallIntegerField',
'int': 'IntegerField',
'integer': 'IntegerField',
'bigint': 'BigIntegerField',
'integer unsigned': 'PositiveIntegerField',
'bigint unsigned': 'PositiveBigIntegerField',
'decimal': 'DecimalField',
'real': 'FloatField',
'text': 'TextField',
'char': 'CharField',
'varchar': 'CharField',
'blob': 'BinaryField',
'date': 'DateField',
'datetime': 'DateTimeField',
'time': 'TimeField',
}
def __getitem__(self, key):
key = key.lower().split('(', 1)[0].strip()
return self.base_data_types_reverse[key]
class DatabaseIntrospection(BaseDatabaseIntrospection):
data_types_reverse = FlexibleFieldLookupDict()
def get_field_type(self, data_type, description):
field_type = super().get_field_type(data_type, description)
if description.pk and field_type in {'BigIntegerField', 'IntegerField', 'SmallIntegerField'}:
# No support for BigAutoField or SmallAutoField as SQLite treats
# all integer primary keys as signed 64-bit integers.
return 'AutoField'
return field_type
def get_table_list(self, cursor):
"""Return a list of table and view names in the current database."""
# Skip the sqlite_sequence system table used for autoincrement key
# generation.
cursor.execute("""
SELECT name, type FROM sqlite_master
WHERE type in ('table', 'view') AND NOT name='sqlite_sequence'
ORDER BY name""")
return [TableInfo(row[0], row[1][0]) for row in cursor.fetchall()]
def get_table_description(self, cursor, table_name):
"""
Return a description of the table with the DB-API cursor.description
interface.
"""
cursor.execute('PRAGMA table_info(%s)' % self.connection.ops.quote_name(table_name))
return [
FieldInfo(
name, data_type, None, get_field_size(data_type), None, None,
not notnull, default, pk == 1,
)
for cid, name, data_type, notnull, default, pk in cursor.fetchall()
]
def get_sequences(self, cursor, table_name, table_fields=()):
pk_col = self.get_primary_key_column(cursor, table_name)
return [{'table': table_name, 'column': pk_col}]
def get_relations(self, cursor, table_name):
"""
Return a dictionary of {field_name: (field_name_other_table, other_table)}
representing all relationships to the given table.
"""
# Dictionary of relations to return
relations = {}
# Schema for this table
cursor.execute(
"SELECT sql, type FROM sqlite_master "
"WHERE tbl_name = %s AND type IN ('table', 'view')",
[table_name]
)
create_sql, table_type = cursor.fetchone()
if table_type == 'view':
# It might be a view, then no results will be returned
return relations
results = create_sql[create_sql.index('(') + 1:create_sql.rindex(')')]
# Walk through and look for references to other tables. SQLite doesn't
# really have enforced references, but since it echoes out the SQL used
# to create the table we can look for REFERENCES statements used there.
for field_desc in results.split(','):
field_desc = field_desc.strip()
if field_desc.startswith("UNIQUE"):
continue
m = re.search(r'references (\S*) ?\(["|]?(.*)["|]?\)', field_desc, re.I)
if not m:
continue
table, column = [s.strip('"') for s in m.groups()]
if field_desc.startswith("FOREIGN KEY"):
# Find name of the target FK field
m = re.match(r'FOREIGN KEY\s*\(([^\)]*)\).*', field_desc, re.I)
field_name = m.groups()[0].strip('"')
else:
field_name = field_desc.split()[0].strip('"')
cursor.execute("SELECT sql FROM sqlite_master WHERE tbl_name = %s", [table])
result = cursor.fetchall()[0]
other_table_results = result[0].strip()
li, ri = other_table_results.index('('), other_table_results.rindex(')')
other_table_results = other_table_results[li + 1:ri]
for other_desc in other_table_results.split(','):
other_desc = other_desc.strip()
if other_desc.startswith('UNIQUE'):
continue
other_name = other_desc.split(' ', 1)[0].strip('"')
if other_name == column:
relations[field_name] = (other_name, table)
break
return relations
def get_key_columns(self, cursor, table_name):
"""
Return a list of (column_name, referenced_table_name, referenced_column_name)
for all key columns in given table.
"""
key_columns = []
# Schema for this table
cursor.execute("SELECT sql FROM sqlite_master WHERE tbl_name = %s AND type = %s", [table_name, "table"])
results = cursor.fetchone()[0].strip()
results = results[results.index('(') + 1:results.rindex(')')]
# Walk through and look for references to other tables. SQLite doesn't
# really have enforced references, but since it echoes out the SQL used
# to create the table we can look for REFERENCES statements used there.
for field_index, field_desc in enumerate(results.split(',')):
field_desc = field_desc.strip()
if field_desc.startswith("UNIQUE"):
continue
m = re.search(r'"(.*)".*references (.*) \(["|](.*)["|]\)', field_desc, re.I)
if not m:
continue
# This will append (column_name, referenced_table_name, referenced_column_name) to key_columns
key_columns.append(tuple(s.strip('"') for s in m.groups()))
return key_columns
def get_primary_key_column(self, cursor, table_name):
"""Return the column name of the primary key for the given table."""
# Don't use PRAGMA because that causes issues with some transactions
cursor.execute(
"SELECT sql, type FROM sqlite_master "
"WHERE tbl_name = %s AND type IN ('table', 'view')",
[table_name]
)
row = cursor.fetchone()
if row is None:
raise ValueError("Table %s does not exist" % table_name)
create_sql, table_type = row
if table_type == 'view':
# Views don't have a primary key.
return None
fields_sql = create_sql[create_sql.index('(') + 1:create_sql.rindex(')')]
for field_desc in fields_sql.split(','):
field_desc = field_desc.strip()
m = re.match(r'(?:(?:["`\[])(.*)(?:["`\]])|(\w+)).*PRIMARY KEY.*', field_desc)
if m:
return m.group(1) if m.group(1) else m.group(2)
return None
def _get_foreign_key_constraints(self, cursor, table_name):
constraints = {}
cursor.execute('PRAGMA foreign_key_list(%s)' % self.connection.ops.quote_name(table_name))
for row in cursor.fetchall():
# Remaining on_update/on_delete/match values are of no interest.
id_, _, table, from_, to = row[:5]
constraints['fk_%d' % id_] = {
'columns': [from_],
'primary_key': False,
'unique': False,
'foreign_key': (table, to),
'check': False,
'index': False,
}
return constraints
def _parse_column_or_constraint_definition(self, tokens, columns):
token = None
is_constraint_definition = None
field_name = None
constraint_name = None
unique = False
unique_columns = []
check = False
check_columns = []
braces_deep = 0
for token in tokens:
if token.match(sqlparse.tokens.Punctuation, '('):
braces_deep += 1
elif token.match(sqlparse.tokens.Punctuation, ')'):
braces_deep -= 1
if braces_deep < 0:
# End of columns and constraints for table definition.
break
elif braces_deep == 0 and token.match(sqlparse.tokens.Punctuation, ','):
# End of current column or constraint definition.
break
# Detect column or constraint definition by first token.
if is_constraint_definition is None:
is_constraint_definition = token.match(sqlparse.tokens.Keyword, 'CONSTRAINT')
if is_constraint_definition:
continue
if is_constraint_definition:
# Detect constraint name by second token.
if constraint_name is None:
if token.ttype in (sqlparse.tokens.Name, sqlparse.tokens.Keyword):
constraint_name = token.value
elif token.ttype == sqlparse.tokens.Literal.String.Symbol:
constraint_name = token.value[1:-1]
# Start constraint columns parsing after UNIQUE keyword.
if token.match(sqlparse.tokens.Keyword, 'UNIQUE'):
unique = True
unique_braces_deep = braces_deep
elif unique:
if unique_braces_deep == braces_deep:
if unique_columns:
# Stop constraint parsing.
unique = False
continue
if token.ttype in (sqlparse.tokens.Name, sqlparse.tokens.Keyword):
unique_columns.append(token.value)
elif token.ttype == sqlparse.tokens.Literal.String.Symbol:
unique_columns.append(token.value[1:-1])
else:
# Detect field name by first token.
if field_name is None:
if token.ttype in (sqlparse.tokens.Name, sqlparse.tokens.Keyword):
field_name = token.value
elif token.ttype == sqlparse.tokens.Literal.String.Symbol:
field_name = token.value[1:-1]
if token.match(sqlparse.tokens.Keyword, 'UNIQUE'):
unique_columns = [field_name]
# Start constraint columns parsing after CHECK keyword.
if token.match(sqlparse.tokens.Keyword, 'CHECK'):
check = True
check_braces_deep = braces_deep
elif check:
if check_braces_deep == braces_deep:
if check_columns:
# Stop constraint parsing.
check = False
continue
if token.ttype in (sqlparse.tokens.Name, sqlparse.tokens.Keyword):
if token.value in columns:
check_columns.append(token.value)
elif token.ttype == sqlparse.tokens.Literal.String.Symbol:
if token.value[1:-1] in columns:
check_columns.append(token.value[1:-1])
unique_constraint = {
'unique': True,
'columns': unique_columns,
'primary_key': False,
'foreign_key': None,
'check': False,
'index': False,
} if unique_columns else None
check_constraint = {
'check': True,
'columns': check_columns,
'primary_key': False,
'unique': False,
'foreign_key': None,
'index': False,
} if check_columns else None
return constraint_name, unique_constraint, check_constraint, token
def _parse_table_constraints(self, sql, columns):
# Check constraint parsing is based of SQLite syntax diagram.
# https://www.sqlite.org/syntaxdiagrams.html#table-constraint
statement = sqlparse.parse(sql)[0]
constraints = {}
unnamed_constrains_index = 0
tokens = (token for token in statement.flatten() if not token.is_whitespace)
# Go to columns and constraint definition
for token in tokens:
if token.match(sqlparse.tokens.Punctuation, '('):
break
# Parse columns and constraint definition
while True:
constraint_name, unique, check, end_token = self._parse_column_or_constraint_definition(tokens, columns)
if unique:
if constraint_name:
constraints[constraint_name] = unique
else:
unnamed_constrains_index += 1
constraints['__unnamed_constraint_%s__' % unnamed_constrains_index] = unique
if check:
if constraint_name:
constraints[constraint_name] = check
else:
unnamed_constrains_index += 1
constraints['__unnamed_constraint_%s__' % unnamed_constrains_index] = check
if end_token.match(sqlparse.tokens.Punctuation, ')'):
break
return constraints
def get_constraints(self, cursor, table_name):
"""
Retrieve any constraints or keys (unique, pk, fk, check, index) across
one or more columns.
"""
constraints = {}
# Find inline check constraints.
try:
table_schema = cursor.execute(
"SELECT sql FROM sqlite_master WHERE type='table' and name=%s" % (
self.connection.ops.quote_name(table_name),
)
).fetchone()[0]
except TypeError:
# table_name is a view.
pass
else:
columns = {info.name for info in self.get_table_description(cursor, table_name)}
constraints.update(self._parse_table_constraints(table_schema, columns))
# Get the index info
cursor.execute("PRAGMA index_list(%s)" % self.connection.ops.quote_name(table_name))
for row in cursor.fetchall():
# SQLite 3.8.9+ has 5 columns, however older versions only give 3
# columns. Discard last 2 columns if there.
number, index, unique = row[:3]
cursor.execute(
"SELECT sql FROM sqlite_master "
"WHERE type='index' AND name=%s" % self.connection.ops.quote_name(index)
)
# There's at most one row.
sql, = cursor.fetchone() or (None,)
# Inline constraints are already detected in
# _parse_table_constraints(). The reasons to avoid fetching inline
# constraints from `PRAGMA index_list` are:
# - Inline constraints can have a different name and information
# than what `PRAGMA index_list` gives.
# - Not all inline constraints may appear in `PRAGMA index_list`.
if not sql:
# An inline constraint
continue
# Get the index info for that index
cursor.execute('PRAGMA index_info(%s)' % self.connection.ops.quote_name(index))
for index_rank, column_rank, column in cursor.fetchall():
if index not in constraints:
constraints[index] = {
"columns": [],
"primary_key": False,
"unique": bool(unique),
"foreign_key": None,
"check": False,
"index": True,
}
constraints[index]['columns'].append(column)
# Add type and column orders for indexes
if constraints[index]['index'] and not constraints[index]['unique']:
# SQLite doesn't support any index type other than b-tree
constraints[index]['type'] = Index.suffix
order_info = sql.split('(')[-1].split(')')[0].split(',')
orders = ['DESC' if info.endswith('DESC') else 'ASC' for info in order_info]
constraints[index]['orders'] = orders
# Get the PK
pk_column = self.get_primary_key_column(cursor, table_name)
if pk_column:
# SQLite doesn't actually give a name to the PK constraint,
# so we invent one. This is fine, as the SQLite backend never
# deletes PK constraints by name, as you can't delete constraints
# in SQLite; we remake the table with a new PK instead.
constraints["__primary__"] = {
"columns": [pk_column],
"primary_key": True,
"unique": False, # It's not actually a unique constraint.
"foreign_key": None,
"check": False,
"index": False,
}
constraints.update(self._get_foreign_key_constraints(cursor, table_name))
return constraints
|
7b06ab51f29d02cc55c64362dbb5196edfdeaec4e60cb998c6ef0898a3edd09e | """
SQLite backend for the sqlite3 module in the standard library.
"""
import datetime
import decimal
import functools
import hashlib
import math
import operator
import re
import statistics
import warnings
from itertools import chain
from sqlite3 import dbapi2 as Database
import pytz
from django.core.exceptions import ImproperlyConfigured
from django.db import IntegrityError
from django.db.backends import utils as backend_utils
from django.db.backends.base.base import BaseDatabaseWrapper
from django.utils import timezone
from django.utils.asyncio import async_unsafe
from django.utils.dateparse import parse_datetime, parse_time
from django.utils.duration import duration_microseconds
from django.utils.regex_helper import _lazy_re_compile
from .client import DatabaseClient # isort:skip
from .creation import DatabaseCreation # isort:skip
from .features import DatabaseFeatures # isort:skip
from .introspection import DatabaseIntrospection # isort:skip
from .operations import DatabaseOperations # isort:skip
from .schema import DatabaseSchemaEditor # isort:skip
def decoder(conv_func):
"""
Convert bytestrings from Python's sqlite3 interface to a regular string.
"""
return lambda s: conv_func(s.decode())
def none_guard(func):
"""
Decorator that returns None if any of the arguments to the decorated
function are None. Many SQL functions return NULL if any of their arguments
are NULL. This decorator simplifies the implementation of this for the
custom functions registered below.
"""
@functools.wraps(func)
def wrapper(*args, **kwargs):
return None if None in args else func(*args, **kwargs)
return wrapper
def list_aggregate(function):
"""
Return an aggregate class that accumulates values in a list and applies
the provided function to the data.
"""
return type('ListAggregate', (list,), {'finalize': function, 'step': list.append})
def check_sqlite_version():
if Database.sqlite_version_info < (3, 8, 3):
raise ImproperlyConfigured('SQLite 3.8.3 or later is required (found %s).' % Database.sqlite_version)
check_sqlite_version()
Database.register_converter("bool", b'1'.__eq__)
Database.register_converter("time", decoder(parse_time))
Database.register_converter("datetime", decoder(parse_datetime))
Database.register_converter("timestamp", decoder(parse_datetime))
Database.register_converter("TIMESTAMP", decoder(parse_datetime))
Database.register_adapter(decimal.Decimal, str)
class DatabaseWrapper(BaseDatabaseWrapper):
vendor = 'sqlite'
display_name = 'SQLite'
# SQLite doesn't actually support most of these types, but it "does the right
# thing" given more verbose field definitions, so leave them as is so that
# schema inspection is more useful.
data_types = {
'AutoField': 'integer',
'BigAutoField': 'integer',
'BinaryField': 'BLOB',
'BooleanField': 'bool',
'CharField': 'varchar(%(max_length)s)',
'DateField': 'date',
'DateTimeField': 'datetime',
'DecimalField': 'decimal',
'DurationField': 'bigint',
'FileField': 'varchar(%(max_length)s)',
'FilePathField': 'varchar(%(max_length)s)',
'FloatField': 'real',
'IntegerField': 'integer',
'BigIntegerField': 'bigint',
'IPAddressField': 'char(15)',
'GenericIPAddressField': 'char(39)',
'NullBooleanField': 'bool',
'OneToOneField': 'integer',
'PositiveBigIntegerField': 'bigint unsigned',
'PositiveIntegerField': 'integer unsigned',
'PositiveSmallIntegerField': 'smallint unsigned',
'SlugField': 'varchar(%(max_length)s)',
'SmallAutoField': 'integer',
'SmallIntegerField': 'smallint',
'TextField': 'text',
'TimeField': 'time',
'UUIDField': 'char(32)',
}
data_type_check_constraints = {
'PositiveBigIntegerField': '"%(column)s" >= 0',
'PositiveIntegerField': '"%(column)s" >= 0',
'PositiveSmallIntegerField': '"%(column)s" >= 0',
}
data_types_suffix = {
'AutoField': 'AUTOINCREMENT',
'BigAutoField': 'AUTOINCREMENT',
'SmallAutoField': 'AUTOINCREMENT',
}
# SQLite requires LIKE statements to include an ESCAPE clause if the value
# being escaped has a percent or underscore in it.
# See https://www.sqlite.org/lang_expr.html for an explanation.
operators = {
'exact': '= %s',
'iexact': "LIKE %s ESCAPE '\\'",
'contains': "LIKE %s ESCAPE '\\'",
'icontains': "LIKE %s ESCAPE '\\'",
'regex': 'REGEXP %s',
'iregex': "REGEXP '(?i)' || %s",
'gt': '> %s',
'gte': '>= %s',
'lt': '< %s',
'lte': '<= %s',
'startswith': "LIKE %s ESCAPE '\\'",
'endswith': "LIKE %s ESCAPE '\\'",
'istartswith': "LIKE %s ESCAPE '\\'",
'iendswith': "LIKE %s ESCAPE '\\'",
}
# The patterns below are used to generate SQL pattern lookup clauses when
# the right-hand side of the lookup isn't a raw string (it might be an expression
# or the result of a bilateral transformation).
# In those cases, special characters for LIKE operators (e.g. \, *, _) should be
# escaped on database side.
#
# Note: we use str.format() here for readability as '%' is used as a wildcard for
# the LIKE operator.
pattern_esc = r"REPLACE(REPLACE(REPLACE({}, '\', '\\'), '%%', '\%%'), '_', '\_')"
pattern_ops = {
'contains': r"LIKE '%%' || {} || '%%' ESCAPE '\'",
'icontains': r"LIKE '%%' || UPPER({}) || '%%' ESCAPE '\'",
'startswith': r"LIKE {} || '%%' ESCAPE '\'",
'istartswith': r"LIKE UPPER({}) || '%%' ESCAPE '\'",
'endswith': r"LIKE '%%' || {} ESCAPE '\'",
'iendswith': r"LIKE '%%' || UPPER({}) ESCAPE '\'",
}
Database = Database
SchemaEditorClass = DatabaseSchemaEditor
# Classes instantiated in __init__().
client_class = DatabaseClient
creation_class = DatabaseCreation
features_class = DatabaseFeatures
introspection_class = DatabaseIntrospection
ops_class = DatabaseOperations
def get_connection_params(self):
settings_dict = self.settings_dict
if not settings_dict['NAME']:
raise ImproperlyConfigured(
"settings.DATABASES is improperly configured. "
"Please supply the NAME value.")
kwargs = {
# TODO: Remove str() when dropping support for PY36.
# https://bugs.python.org/issue33496
'database': str(settings_dict['NAME']),
'detect_types': Database.PARSE_DECLTYPES | Database.PARSE_COLNAMES,
**settings_dict['OPTIONS'],
}
# Always allow the underlying SQLite connection to be shareable
# between multiple threads. The safe-guarding will be handled at a
# higher level by the `BaseDatabaseWrapper.allow_thread_sharing`
# property. This is necessary as the shareability is disabled by
# default in pysqlite and it cannot be changed once a connection is
# opened.
if 'check_same_thread' in kwargs and kwargs['check_same_thread']:
warnings.warn(
'The `check_same_thread` option was provided and set to '
'True. It will be overridden with False. Use the '
'`DatabaseWrapper.allow_thread_sharing` property instead '
'for controlling thread shareability.',
RuntimeWarning
)
kwargs.update({'check_same_thread': False, 'uri': True})
return kwargs
@async_unsafe
def get_new_connection(self, conn_params):
conn = Database.connect(**conn_params)
conn.create_function("django_date_extract", 2, _sqlite_datetime_extract)
conn.create_function("django_date_trunc", 2, _sqlite_date_trunc)
conn.create_function('django_datetime_cast_date', 3, _sqlite_datetime_cast_date)
conn.create_function('django_datetime_cast_time', 3, _sqlite_datetime_cast_time)
conn.create_function('django_datetime_extract', 4, _sqlite_datetime_extract)
conn.create_function('django_datetime_trunc', 4, _sqlite_datetime_trunc)
conn.create_function("django_time_extract", 2, _sqlite_time_extract)
conn.create_function("django_time_trunc", 2, _sqlite_time_trunc)
conn.create_function("django_time_diff", 2, _sqlite_time_diff)
conn.create_function("django_timestamp_diff", 2, _sqlite_timestamp_diff)
conn.create_function("django_format_dtdelta", 3, _sqlite_format_dtdelta)
conn.create_function('regexp', 2, _sqlite_regexp)
conn.create_function('ACOS', 1, none_guard(math.acos))
conn.create_function('ASIN', 1, none_guard(math.asin))
conn.create_function('ATAN', 1, none_guard(math.atan))
conn.create_function('ATAN2', 2, none_guard(math.atan2))
conn.create_function('CEILING', 1, none_guard(math.ceil))
conn.create_function('COS', 1, none_guard(math.cos))
conn.create_function('COT', 1, none_guard(lambda x: 1 / math.tan(x)))
conn.create_function('DEGREES', 1, none_guard(math.degrees))
conn.create_function('EXP', 1, none_guard(math.exp))
conn.create_function('FLOOR', 1, none_guard(math.floor))
conn.create_function('LN', 1, none_guard(math.log))
conn.create_function('LOG', 2, none_guard(lambda x, y: math.log(y, x)))
conn.create_function('LPAD', 3, _sqlite_lpad)
conn.create_function('MD5', 1, none_guard(lambda x: hashlib.md5(x.encode()).hexdigest()))
conn.create_function('MOD', 2, none_guard(math.fmod))
conn.create_function('PI', 0, lambda: math.pi)
conn.create_function('POWER', 2, none_guard(operator.pow))
conn.create_function('RADIANS', 1, none_guard(math.radians))
conn.create_function('REPEAT', 2, none_guard(operator.mul))
conn.create_function('REVERSE', 1, none_guard(lambda x: x[::-1]))
conn.create_function('RPAD', 3, _sqlite_rpad)
conn.create_function('SHA1', 1, none_guard(lambda x: hashlib.sha1(x.encode()).hexdigest()))
conn.create_function('SHA224', 1, none_guard(lambda x: hashlib.sha224(x.encode()).hexdigest()))
conn.create_function('SHA256', 1, none_guard(lambda x: hashlib.sha256(x.encode()).hexdigest()))
conn.create_function('SHA384', 1, none_guard(lambda x: hashlib.sha384(x.encode()).hexdigest()))
conn.create_function('SHA512', 1, none_guard(lambda x: hashlib.sha512(x.encode()).hexdigest()))
conn.create_function('SIGN', 1, none_guard(lambda x: (x > 0) - (x < 0)))
conn.create_function('SIN', 1, none_guard(math.sin))
conn.create_function('SQRT', 1, none_guard(math.sqrt))
conn.create_function('TAN', 1, none_guard(math.tan))
conn.create_aggregate('STDDEV_POP', 1, list_aggregate(statistics.pstdev))
conn.create_aggregate('STDDEV_SAMP', 1, list_aggregate(statistics.stdev))
conn.create_aggregate('VAR_POP', 1, list_aggregate(statistics.pvariance))
conn.create_aggregate('VAR_SAMP', 1, list_aggregate(statistics.variance))
conn.execute('PRAGMA foreign_keys = ON')
return conn
def init_connection_state(self):
pass
def create_cursor(self, name=None):
return self.connection.cursor(factory=SQLiteCursorWrapper)
@async_unsafe
def close(self):
self.validate_thread_sharing()
# If database is in memory, closing the connection destroys the
# database. To prevent accidental data loss, ignore close requests on
# an in-memory db.
if not self.is_in_memory_db():
BaseDatabaseWrapper.close(self)
def _savepoint_allowed(self):
# When 'isolation_level' is not None, sqlite3 commits before each
# savepoint; it's a bug. When it is None, savepoints don't make sense
# because autocommit is enabled. The only exception is inside 'atomic'
# blocks. To work around that bug, on SQLite, 'atomic' starts a
# transaction explicitly rather than simply disable autocommit.
return self.in_atomic_block
def _set_autocommit(self, autocommit):
if autocommit:
level = None
else:
# sqlite3's internal default is ''. It's different from None.
# See Modules/_sqlite/connection.c.
level = ''
# 'isolation_level' is a misleading API.
# SQLite always runs at the SERIALIZABLE isolation level.
with self.wrap_database_errors:
self.connection.isolation_level = level
def disable_constraint_checking(self):
with self.cursor() as cursor:
cursor.execute('PRAGMA foreign_keys = OFF')
# Foreign key constraints cannot be turned off while in a multi-
# statement transaction. Fetch the current state of the pragma
# to determine if constraints are effectively disabled.
enabled = cursor.execute('PRAGMA foreign_keys').fetchone()[0]
return not bool(enabled)
def enable_constraint_checking(self):
self.cursor().execute('PRAGMA foreign_keys = ON')
def check_constraints(self, table_names=None):
"""
Check each table name in `table_names` for rows with invalid foreign
key references. This method is intended to be used in conjunction with
`disable_constraint_checking()` and `enable_constraint_checking()`, to
determine if rows with invalid references were entered while constraint
checks were off.
"""
if self.features.supports_pragma_foreign_key_check:
with self.cursor() as cursor:
if table_names is None:
violations = self.cursor().execute('PRAGMA foreign_key_check').fetchall()
else:
violations = chain.from_iterable(
cursor.execute('PRAGMA foreign_key_check(%s)' % table_name).fetchall()
for table_name in table_names
)
# See https://www.sqlite.org/pragma.html#pragma_foreign_key_check
for table_name, rowid, referenced_table_name, foreign_key_index in violations:
foreign_key = cursor.execute(
'PRAGMA foreign_key_list(%s)' % table_name
).fetchall()[foreign_key_index]
column_name, referenced_column_name = foreign_key[3:5]
primary_key_column_name = self.introspection.get_primary_key_column(cursor, table_name)
primary_key_value, bad_value = cursor.execute(
'SELECT %s, %s FROM %s WHERE rowid = %%s' % (
primary_key_column_name, column_name, table_name
),
(rowid,),
).fetchone()
raise IntegrityError(
"The row in table '%s' with primary key '%s' has an "
"invalid foreign key: %s.%s contains a value '%s' that "
"does not have a corresponding value in %s.%s." % (
table_name, primary_key_value, table_name, column_name,
bad_value, referenced_table_name, referenced_column_name
)
)
else:
with self.cursor() as cursor:
if table_names is None:
table_names = self.introspection.table_names(cursor)
for table_name in table_names:
primary_key_column_name = self.introspection.get_primary_key_column(cursor, table_name)
if not primary_key_column_name:
continue
key_columns = self.introspection.get_key_columns(cursor, table_name)
for column_name, referenced_table_name, referenced_column_name in key_columns:
cursor.execute(
"""
SELECT REFERRING.`%s`, REFERRING.`%s` FROM `%s` as REFERRING
LEFT JOIN `%s` as REFERRED
ON (REFERRING.`%s` = REFERRED.`%s`)
WHERE REFERRING.`%s` IS NOT NULL AND REFERRED.`%s` IS NULL
"""
% (
primary_key_column_name, column_name, table_name,
referenced_table_name, column_name, referenced_column_name,
column_name, referenced_column_name,
)
)
for bad_row in cursor.fetchall():
raise IntegrityError(
"The row in table '%s' with primary key '%s' has an "
"invalid foreign key: %s.%s contains a value '%s' that "
"does not have a corresponding value in %s.%s." % (
table_name, bad_row[0], table_name, column_name,
bad_row[1], referenced_table_name, referenced_column_name,
)
)
def is_usable(self):
return True
def _start_transaction_under_autocommit(self):
"""
Start a transaction explicitly in autocommit mode.
Staying in autocommit mode works around a bug of sqlite3 that breaks
savepoints when autocommit is disabled.
"""
self.cursor().execute("BEGIN")
def is_in_memory_db(self):
return self.creation.is_in_memory_db(self.settings_dict['NAME'])
FORMAT_QMARK_REGEX = _lazy_re_compile(r'(?<!%)%s')
class SQLiteCursorWrapper(Database.Cursor):
"""
Django uses "format" style placeholders, but pysqlite2 uses "qmark" style.
This fixes it -- but note that if you want to use a literal "%s" in a query,
you'll need to use "%%s".
"""
def execute(self, query, params=None):
if params is None:
return Database.Cursor.execute(self, query)
query = self.convert_query(query)
return Database.Cursor.execute(self, query, params)
def executemany(self, query, param_list):
query = self.convert_query(query)
return Database.Cursor.executemany(self, query, param_list)
def convert_query(self, query):
return FORMAT_QMARK_REGEX.sub('?', query).replace('%%', '%')
def _sqlite_datetime_parse(dt, tzname=None, conn_tzname=None):
if dt is None:
return None
try:
dt = backend_utils.typecast_timestamp(dt)
except (TypeError, ValueError):
return None
if conn_tzname:
dt = dt.replace(tzinfo=pytz.timezone(conn_tzname))
if tzname is not None and tzname != conn_tzname:
sign_index = tzname.find('+') + tzname.find('-') + 1
if sign_index > -1:
sign = tzname[sign_index]
tzname, offset = tzname.split(sign)
if offset:
hours, minutes = offset.split(':')
offset_delta = datetime.timedelta(hours=int(hours), minutes=int(minutes))
dt += offset_delta if sign == '+' else -offset_delta
dt = timezone.localtime(dt, pytz.timezone(tzname))
return dt
def _sqlite_date_trunc(lookup_type, dt):
dt = _sqlite_datetime_parse(dt)
if dt is None:
return None
if lookup_type == 'year':
return "%i-01-01" % dt.year
elif lookup_type == 'quarter':
month_in_quarter = dt.month - (dt.month - 1) % 3
return '%i-%02i-01' % (dt.year, month_in_quarter)
elif lookup_type == 'month':
return "%i-%02i-01" % (dt.year, dt.month)
elif lookup_type == 'week':
dt = dt - datetime.timedelta(days=dt.weekday())
return "%i-%02i-%02i" % (dt.year, dt.month, dt.day)
elif lookup_type == 'day':
return "%i-%02i-%02i" % (dt.year, dt.month, dt.day)
def _sqlite_time_trunc(lookup_type, dt):
if dt is None:
return None
try:
dt = backend_utils.typecast_time(dt)
except (ValueError, TypeError):
return None
if lookup_type == 'hour':
return "%02i:00:00" % dt.hour
elif lookup_type == 'minute':
return "%02i:%02i:00" % (dt.hour, dt.minute)
elif lookup_type == 'second':
return "%02i:%02i:%02i" % (dt.hour, dt.minute, dt.second)
def _sqlite_datetime_cast_date(dt, tzname, conn_tzname):
dt = _sqlite_datetime_parse(dt, tzname, conn_tzname)
if dt is None:
return None
return dt.date().isoformat()
def _sqlite_datetime_cast_time(dt, tzname, conn_tzname):
dt = _sqlite_datetime_parse(dt, tzname, conn_tzname)
if dt is None:
return None
return dt.time().isoformat()
def _sqlite_datetime_extract(lookup_type, dt, tzname=None, conn_tzname=None):
dt = _sqlite_datetime_parse(dt, tzname, conn_tzname)
if dt is None:
return None
if lookup_type == 'week_day':
return (dt.isoweekday() % 7) + 1
elif lookup_type == 'iso_week_day':
return dt.isoweekday()
elif lookup_type == 'week':
return dt.isocalendar()[1]
elif lookup_type == 'quarter':
return math.ceil(dt.month / 3)
elif lookup_type == 'iso_year':
return dt.isocalendar()[0]
else:
return getattr(dt, lookup_type)
def _sqlite_datetime_trunc(lookup_type, dt, tzname, conn_tzname):
dt = _sqlite_datetime_parse(dt, tzname, conn_tzname)
if dt is None:
return None
if lookup_type == 'year':
return "%i-01-01 00:00:00" % dt.year
elif lookup_type == 'quarter':
month_in_quarter = dt.month - (dt.month - 1) % 3
return '%i-%02i-01 00:00:00' % (dt.year, month_in_quarter)
elif lookup_type == 'month':
return "%i-%02i-01 00:00:00" % (dt.year, dt.month)
elif lookup_type == 'week':
dt = dt - datetime.timedelta(days=dt.weekday())
return "%i-%02i-%02i 00:00:00" % (dt.year, dt.month, dt.day)
elif lookup_type == 'day':
return "%i-%02i-%02i 00:00:00" % (dt.year, dt.month, dt.day)
elif lookup_type == 'hour':
return "%i-%02i-%02i %02i:00:00" % (dt.year, dt.month, dt.day, dt.hour)
elif lookup_type == 'minute':
return "%i-%02i-%02i %02i:%02i:00" % (dt.year, dt.month, dt.day, dt.hour, dt.minute)
elif lookup_type == 'second':
return "%i-%02i-%02i %02i:%02i:%02i" % (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second)
def _sqlite_time_extract(lookup_type, dt):
if dt is None:
return None
try:
dt = backend_utils.typecast_time(dt)
except (ValueError, TypeError):
return None
return getattr(dt, lookup_type)
@none_guard
def _sqlite_format_dtdelta(conn, lhs, rhs):
"""
LHS and RHS can be either:
- An integer number of microseconds
- A string representing a datetime
"""
try:
real_lhs = datetime.timedelta(0, 0, lhs) if isinstance(lhs, int) else backend_utils.typecast_timestamp(lhs)
real_rhs = datetime.timedelta(0, 0, rhs) if isinstance(rhs, int) else backend_utils.typecast_timestamp(rhs)
if conn.strip() == '+':
out = real_lhs + real_rhs
else:
out = real_lhs - real_rhs
except (ValueError, TypeError):
return None
# typecast_timestamp returns a date or a datetime without timezone.
# It will be formatted as "%Y-%m-%d" or "%Y-%m-%d %H:%M:%S[.%f]"
return str(out)
@none_guard
def _sqlite_time_diff(lhs, rhs):
left = backend_utils.typecast_time(lhs)
right = backend_utils.typecast_time(rhs)
return (
(left.hour * 60 * 60 * 1000000) +
(left.minute * 60 * 1000000) +
(left.second * 1000000) +
(left.microsecond) -
(right.hour * 60 * 60 * 1000000) -
(right.minute * 60 * 1000000) -
(right.second * 1000000) -
(right.microsecond)
)
@none_guard
def _sqlite_timestamp_diff(lhs, rhs):
left = backend_utils.typecast_timestamp(lhs)
right = backend_utils.typecast_timestamp(rhs)
return duration_microseconds(left - right)
@none_guard
def _sqlite_regexp(re_pattern, re_string):
return bool(re.search(re_pattern, str(re_string)))
@none_guard
def _sqlite_lpad(text, length, fill_text):
if len(text) >= length:
return text[:length]
return (fill_text * length)[:length - len(text)] + text
@none_guard
def _sqlite_rpad(text, length, fill_text):
return (text + fill_text * length)[:length]
|
6eefa9a8c40199e7b97e8f2670a16ff6205aa5513b51ef0be23d160162c48194 | import datetime
import decimal
import uuid
from functools import lru_cache
from itertools import chain
from django.conf import settings
from django.core.exceptions import FieldError
from django.db import DatabaseError, NotSupportedError, models
from django.db.backends.base.operations import BaseDatabaseOperations
from django.db.models.expressions import Col
from django.utils import timezone
from django.utils.dateparse import parse_date, parse_datetime, parse_time
from django.utils.duration import duration_microseconds
from django.utils.functional import cached_property
class DatabaseOperations(BaseDatabaseOperations):
cast_char_field_without_max_length = 'text'
cast_data_types = {
'DateField': 'TEXT',
'DateTimeField': 'TEXT',
}
explain_prefix = 'EXPLAIN QUERY PLAN'
def bulk_batch_size(self, fields, objs):
"""
SQLite has a compile-time default (SQLITE_LIMIT_VARIABLE_NUMBER) of
999 variables per query.
If there's only a single field to insert, the limit is 500
(SQLITE_MAX_COMPOUND_SELECT).
"""
if len(fields) == 1:
return 500
elif len(fields) > 1:
return self.connection.features.max_query_params // len(fields)
else:
return len(objs)
def check_expression_support(self, expression):
bad_fields = (models.DateField, models.DateTimeField, models.TimeField)
bad_aggregates = (models.Sum, models.Avg, models.Variance, models.StdDev)
if isinstance(expression, bad_aggregates):
for expr in expression.get_source_expressions():
try:
output_field = expr.output_field
except (AttributeError, FieldError):
# Not every subexpression has an output_field which is fine
# to ignore.
pass
else:
if isinstance(output_field, bad_fields):
raise NotSupportedError(
'You cannot use Sum, Avg, StdDev, and Variance '
'aggregations on date/time fields in sqlite3 '
'since date/time is saved as text.'
)
if isinstance(expression, models.Aggregate) and len(expression.source_expressions) > 1:
raise NotSupportedError(
"SQLite doesn't support DISTINCT on aggregate functions "
"accepting multiple arguments."
)
def date_extract_sql(self, lookup_type, field_name):
"""
Support EXTRACT with a user-defined function django_date_extract()
that's registered in connect(). Use single quotes because this is a
string and could otherwise cause a collision with a field name.
"""
return "django_date_extract('%s', %s)" % (lookup_type.lower(), field_name)
def date_interval_sql(self, timedelta):
return str(duration_microseconds(timedelta))
def format_for_duration_arithmetic(self, sql):
"""Do nothing since formatting is handled in the custom function."""
return sql
def date_trunc_sql(self, lookup_type, field_name):
return "django_date_trunc('%s', %s)" % (lookup_type.lower(), field_name)
def time_trunc_sql(self, lookup_type, field_name):
return "django_time_trunc('%s', %s)" % (lookup_type.lower(), field_name)
def _convert_tznames_to_sql(self, tzname):
if settings.USE_TZ:
return "'%s'" % tzname, "'%s'" % self.connection.timezone_name
return 'NULL', 'NULL'
def datetime_cast_date_sql(self, field_name, tzname):
return 'django_datetime_cast_date(%s, %s, %s)' % (
field_name, *self._convert_tznames_to_sql(tzname),
)
def datetime_cast_time_sql(self, field_name, tzname):
return 'django_datetime_cast_time(%s, %s, %s)' % (
field_name, *self._convert_tznames_to_sql(tzname),
)
def datetime_extract_sql(self, lookup_type, field_name, tzname):
return "django_datetime_extract('%s', %s, %s, %s)" % (
lookup_type.lower(), field_name, *self._convert_tznames_to_sql(tzname),
)
def datetime_trunc_sql(self, lookup_type, field_name, tzname):
return "django_datetime_trunc('%s', %s, %s, %s)" % (
lookup_type.lower(), field_name, *self._convert_tznames_to_sql(tzname),
)
def time_extract_sql(self, lookup_type, field_name):
return "django_time_extract('%s', %s)" % (lookup_type.lower(), field_name)
def pk_default_value(self):
return "NULL"
def _quote_params_for_last_executed_query(self, params):
"""
Only for last_executed_query! Don't use this to execute SQL queries!
"""
# This function is limited both by SQLITE_LIMIT_VARIABLE_NUMBER (the
# number of parameters, default = 999) and SQLITE_MAX_COLUMN (the
# number of return values, default = 2000). Since Python's sqlite3
# module doesn't expose the get_limit() C API, assume the default
# limits are in effect and split the work in batches if needed.
BATCH_SIZE = 999
if len(params) > BATCH_SIZE:
results = ()
for index in range(0, len(params), BATCH_SIZE):
chunk = params[index:index + BATCH_SIZE]
results += self._quote_params_for_last_executed_query(chunk)
return results
sql = 'SELECT ' + ', '.join(['QUOTE(?)'] * len(params))
# Bypass Django's wrappers and use the underlying sqlite3 connection
# to avoid logging this query - it would trigger infinite recursion.
cursor = self.connection.connection.cursor()
# Native sqlite3 cursors cannot be used as context managers.
try:
return cursor.execute(sql, params).fetchone()
finally:
cursor.close()
def last_executed_query(self, cursor, sql, params):
# Python substitutes parameters in Modules/_sqlite/cursor.c with:
# pysqlite_statement_bind_parameters(self->statement, parameters, allow_8bit_chars);
# Unfortunately there is no way to reach self->statement from Python,
# so we quote and substitute parameters manually.
if params:
if isinstance(params, (list, tuple)):
params = self._quote_params_for_last_executed_query(params)
else:
values = tuple(params.values())
values = self._quote_params_for_last_executed_query(values)
params = dict(zip(params, values))
return sql % params
# For consistency with SQLiteCursorWrapper.execute(), just return sql
# when there are no parameters. See #13648 and #17158.
else:
return sql
def quote_name(self, name):
if name.startswith('"') and name.endswith('"'):
return name # Quoting once is enough.
return '"%s"' % name
def no_limit_value(self):
return -1
def __references_graph(self, table_name):
query = """
WITH tables AS (
SELECT %s name
UNION
SELECT sqlite_master.name
FROM sqlite_master
JOIN tables ON (sql REGEXP %s || tables.name || %s)
) SELECT name FROM tables;
"""
params = (
table_name,
r'(?i)\s+references\s+("|\')?',
r'("|\')?\s*\(',
)
with self.connection.cursor() as cursor:
results = cursor.execute(query, params)
return [row[0] for row in results.fetchall()]
@cached_property
def _references_graph(self):
# 512 is large enough to fit the ~330 tables (as of this writing) in
# Django's test suite.
return lru_cache(maxsize=512)(self.__references_graph)
def sql_flush(self, style, tables, sequences, allow_cascade=False):
if tables and allow_cascade:
# Simulate TRUNCATE CASCADE by recursively collecting the tables
# referencing the tables to be flushed.
tables = set(chain.from_iterable(self._references_graph(table) for table in tables))
# Note: No requirement for reset of auto-incremented indices (cf. other
# sql_flush() implementations). Just return SQL at this point
return ['%s %s %s;' % (
style.SQL_KEYWORD('DELETE'),
style.SQL_KEYWORD('FROM'),
style.SQL_FIELD(self.quote_name(table))
) for table in tables]
def adapt_datetimefield_value(self, value):
if value is None:
return None
# Expression values are adapted by the database.
if hasattr(value, 'resolve_expression'):
return value
# SQLite doesn't support tz-aware datetimes
if timezone.is_aware(value):
if settings.USE_TZ:
value = timezone.make_naive(value, self.connection.timezone)
else:
raise ValueError("SQLite backend does not support timezone-aware datetimes when USE_TZ is False.")
return str(value)
def adapt_timefield_value(self, value):
if value is None:
return None
# Expression values are adapted by the database.
if hasattr(value, 'resolve_expression'):
return value
# SQLite doesn't support tz-aware datetimes
if timezone.is_aware(value):
raise ValueError("SQLite backend does not support timezone-aware times.")
return str(value)
def get_db_converters(self, expression):
converters = super().get_db_converters(expression)
internal_type = expression.output_field.get_internal_type()
if internal_type == 'DateTimeField':
converters.append(self.convert_datetimefield_value)
elif internal_type == 'DateField':
converters.append(self.convert_datefield_value)
elif internal_type == 'TimeField':
converters.append(self.convert_timefield_value)
elif internal_type == 'DecimalField':
converters.append(self.get_decimalfield_converter(expression))
elif internal_type == 'UUIDField':
converters.append(self.convert_uuidfield_value)
elif internal_type in ('NullBooleanField', 'BooleanField'):
converters.append(self.convert_booleanfield_value)
return converters
def convert_datetimefield_value(self, value, expression, connection):
if value is not None:
if not isinstance(value, datetime.datetime):
value = parse_datetime(value)
if settings.USE_TZ and not timezone.is_aware(value):
value = timezone.make_aware(value, self.connection.timezone)
return value
def convert_datefield_value(self, value, expression, connection):
if value is not None:
if not isinstance(value, datetime.date):
value = parse_date(value)
return value
def convert_timefield_value(self, value, expression, connection):
if value is not None:
if not isinstance(value, datetime.time):
value = parse_time(value)
return value
def get_decimalfield_converter(self, expression):
# SQLite stores only 15 significant digits. Digits coming from
# float inaccuracy must be removed.
create_decimal = decimal.Context(prec=15).create_decimal_from_float
if isinstance(expression, Col):
quantize_value = decimal.Decimal(1).scaleb(-expression.output_field.decimal_places)
def converter(value, expression, connection):
if value is not None:
return create_decimal(value).quantize(quantize_value, context=expression.output_field.context)
else:
def converter(value, expression, connection):
if value is not None:
return create_decimal(value)
return converter
def convert_uuidfield_value(self, value, expression, connection):
if value is not None:
value = uuid.UUID(value)
return value
def convert_booleanfield_value(self, value, expression, connection):
return bool(value) if value in (1, 0) else value
def bulk_insert_sql(self, fields, placeholder_rows):
return " UNION ALL ".join(
"SELECT %s" % ", ".join(row)
for row in placeholder_rows
)
def combine_expression(self, connector, sub_expressions):
# SQLite doesn't have a ^ operator, so use the user-defined POWER
# function that's registered in connect().
if connector == '^':
return 'POWER(%s)' % ','.join(sub_expressions)
return super().combine_expression(connector, sub_expressions)
def combine_duration_expression(self, connector, sub_expressions):
if connector not in ['+', '-']:
raise DatabaseError('Invalid connector for timedelta: %s.' % connector)
fn_params = ["'%s'" % connector] + sub_expressions
if len(fn_params) > 3:
raise ValueError('Too many params for timedelta operations.')
return "django_format_dtdelta(%s)" % ', '.join(fn_params)
def integer_field_range(self, internal_type):
# SQLite doesn't enforce any integer constraints
return (None, None)
def subtract_temporals(self, internal_type, lhs, rhs):
lhs_sql, lhs_params = lhs
rhs_sql, rhs_params = rhs
params = (*lhs_params, *rhs_params)
if internal_type == 'TimeField':
return 'django_time_diff(%s, %s)' % (lhs_sql, rhs_sql), params
return 'django_timestamp_diff(%s, %s)' % (lhs_sql, rhs_sql), params
def insert_statement(self, ignore_conflicts=False):
return 'INSERT OR IGNORE INTO' if ignore_conflicts else super().insert_statement(ignore_conflicts)
|
c25061766665f3efac55e27a70d96129560fa85065508c93860ce03e74697f6b | import copy
from decimal import Decimal
from django.apps.registry import Apps
from django.db import NotSupportedError
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
from django.db.backends.ddl_references import Statement
from django.db.backends.utils import strip_quotes
from django.db.models import UniqueConstraint
from django.db.transaction import atomic
class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
sql_delete_table = "DROP TABLE %(table)s"
sql_create_fk = None
sql_create_inline_fk = "REFERENCES %(to_table)s (%(to_column)s) DEFERRABLE INITIALLY DEFERRED"
sql_create_unique = "CREATE UNIQUE INDEX %(name)s ON %(table)s (%(columns)s)"
sql_delete_unique = "DROP INDEX %(name)s"
def __enter__(self):
# Some SQLite schema alterations need foreign key constraints to be
# disabled. Enforce it here for the duration of the schema edition.
if not self.connection.disable_constraint_checking():
raise NotSupportedError(
'SQLite schema editor cannot be used while foreign key '
'constraint checks are enabled. Make sure to disable them '
'before entering a transaction.atomic() context because '
'SQLite does not support disabling them in the middle of '
'a multi-statement transaction.'
)
return super().__enter__()
def __exit__(self, exc_type, exc_value, traceback):
self.connection.check_constraints()
super().__exit__(exc_type, exc_value, traceback)
self.connection.enable_constraint_checking()
def quote_value(self, value):
# The backend "mostly works" without this function and there are use
# cases for compiling Python without the sqlite3 libraries (e.g.
# security hardening).
try:
import sqlite3
value = sqlite3.adapt(value)
except ImportError:
pass
except sqlite3.ProgrammingError:
pass
# Manual emulation of SQLite parameter quoting
if isinstance(value, bool):
return str(int(value))
elif isinstance(value, (Decimal, float, int)):
return str(value)
elif isinstance(value, str):
return "'%s'" % value.replace("\'", "\'\'")
elif value is None:
return "NULL"
elif isinstance(value, (bytes, bytearray, memoryview)):
# Bytes are only allowed for BLOB fields, encoded as string
# literals containing hexadecimal data and preceded by a single "X"
# character.
return "X'%s'" % value.hex()
else:
raise ValueError("Cannot quote parameter value %r of type %s" % (value, type(value)))
def _is_referenced_by_fk_constraint(self, table_name, column_name=None, ignore_self=False):
"""
Return whether or not the provided table name is referenced by another
one. If `column_name` is specified, only references pointing to that
column are considered. If `ignore_self` is True, self-referential
constraints are ignored.
"""
with self.connection.cursor() as cursor:
for other_table in self.connection.introspection.get_table_list(cursor):
if ignore_self and other_table.name == table_name:
continue
constraints = self.connection.introspection._get_foreign_key_constraints(cursor, other_table.name)
for constraint in constraints.values():
constraint_table, constraint_column = constraint['foreign_key']
if (constraint_table == table_name and
(column_name is None or constraint_column == column_name)):
return True
return False
def alter_db_table(self, model, old_db_table, new_db_table, disable_constraints=True):
if (not self.connection.features.supports_atomic_references_rename and
disable_constraints and self._is_referenced_by_fk_constraint(old_db_table)):
if self.connection.in_atomic_block:
raise NotSupportedError((
'Renaming the %r table while in a transaction is not '
'supported on SQLite < 3.26 because it would break referential '
'integrity. Try adding `atomic = False` to the Migration class.'
) % old_db_table)
self.connection.enable_constraint_checking()
super().alter_db_table(model, old_db_table, new_db_table)
self.connection.disable_constraint_checking()
else:
super().alter_db_table(model, old_db_table, new_db_table)
def alter_field(self, model, old_field, new_field, strict=False):
old_field_name = old_field.name
table_name = model._meta.db_table
_, old_column_name = old_field.get_attname_column()
if (new_field.name != old_field_name and
not self.connection.features.supports_atomic_references_rename and
self._is_referenced_by_fk_constraint(table_name, old_column_name, ignore_self=True)):
if self.connection.in_atomic_block:
raise NotSupportedError((
'Renaming the %r.%r column while in a transaction is not '
'supported on SQLite < 3.26 because it would break referential '
'integrity. Try adding `atomic = False` to the Migration class.'
) % (model._meta.db_table, old_field_name))
with atomic(self.connection.alias):
super().alter_field(model, old_field, new_field, strict=strict)
# Follow SQLite's documented procedure for performing changes
# that don't affect the on-disk content.
# https://sqlite.org/lang_altertable.html#otheralter
with self.connection.cursor() as cursor:
schema_version = cursor.execute('PRAGMA schema_version').fetchone()[0]
cursor.execute('PRAGMA writable_schema = 1')
references_template = ' REFERENCES "%s" ("%%s") ' % table_name
new_column_name = new_field.get_attname_column()[1]
search = references_template % old_column_name
replacement = references_template % new_column_name
cursor.execute('UPDATE sqlite_master SET sql = replace(sql, %s, %s)', (search, replacement))
cursor.execute('PRAGMA schema_version = %d' % (schema_version + 1))
cursor.execute('PRAGMA writable_schema = 0')
# The integrity check will raise an exception and rollback
# the transaction if the sqlite_master updates corrupt the
# database.
cursor.execute('PRAGMA integrity_check')
# Perform a VACUUM to refresh the database representation from
# the sqlite_master table.
with self.connection.cursor() as cursor:
cursor.execute('VACUUM')
else:
super().alter_field(model, old_field, new_field, strict=strict)
def _remake_table(self, model, create_field=None, delete_field=None, alter_field=None):
"""
Shortcut to transform a model from old_model into new_model
This follows the correct procedure to perform non-rename or column
addition operations based on SQLite's documentation
https://www.sqlite.org/lang_altertable.html#caution
The essential steps are:
1. Create a table with the updated definition called "new__app_model"
2. Copy the data from the existing "app_model" table to the new table
3. Drop the "app_model" table
4. Rename the "new__app_model" table to "app_model"
5. Restore any index of the previous "app_model" table.
"""
# Self-referential fields must be recreated rather than copied from
# the old model to ensure their remote_field.field_name doesn't refer
# to an altered field.
def is_self_referential(f):
return f.is_relation and f.remote_field.model is model
# Work out the new fields dict / mapping
body = {
f.name: f.clone() if is_self_referential(f) else f
for f in model._meta.local_concrete_fields
}
# Since mapping might mix column names and default values,
# its values must be already quoted.
mapping = {f.column: self.quote_name(f.column) for f in model._meta.local_concrete_fields}
# This maps field names (not columns) for things like unique_together
rename_mapping = {}
# If any of the new or altered fields is introducing a new PK,
# remove the old one
restore_pk_field = None
if getattr(create_field, 'primary_key', False) or (
alter_field and getattr(alter_field[1], 'primary_key', False)):
for name, field in list(body.items()):
if field.primary_key:
field.primary_key = False
restore_pk_field = field
if field.auto_created:
del body[name]
del mapping[field.column]
# Add in any created fields
if create_field:
body[create_field.name] = create_field
# Choose a default and insert it into the copy map
if not create_field.many_to_many and create_field.concrete:
mapping[create_field.column] = self.quote_value(
self.effective_default(create_field)
)
# Add in any altered fields
if alter_field:
old_field, new_field = alter_field
body.pop(old_field.name, None)
mapping.pop(old_field.column, None)
body[new_field.name] = new_field
if old_field.null and not new_field.null:
case_sql = "coalesce(%(col)s, %(default)s)" % {
'col': self.quote_name(old_field.column),
'default': self.quote_value(self.effective_default(new_field))
}
mapping[new_field.column] = case_sql
else:
mapping[new_field.column] = self.quote_name(old_field.column)
rename_mapping[old_field.name] = new_field.name
# Remove any deleted fields
if delete_field:
del body[delete_field.name]
del mapping[delete_field.column]
# Remove any implicit M2M tables
if delete_field.many_to_many and delete_field.remote_field.through._meta.auto_created:
return self.delete_model(delete_field.remote_field.through)
# Work inside a new app registry
apps = Apps()
# Work out the new value of unique_together, taking renames into
# account
unique_together = [
[rename_mapping.get(n, n) for n in unique]
for unique in model._meta.unique_together
]
# Work out the new value for index_together, taking renames into
# account
index_together = [
[rename_mapping.get(n, n) for n in index]
for index in model._meta.index_together
]
indexes = model._meta.indexes
if delete_field:
indexes = [
index for index in indexes
if delete_field.name not in index.fields
]
constraints = list(model._meta.constraints)
# Provide isolated instances of the fields to the new model body so
# that the existing model's internals aren't interfered with when
# the dummy model is constructed.
body_copy = copy.deepcopy(body)
# Construct a new model with the new fields to allow self referential
# primary key to resolve to. This model won't ever be materialized as a
# table and solely exists for foreign key reference resolution purposes.
# This wouldn't be required if the schema editor was operating on model
# states instead of rendered models.
meta_contents = {
'app_label': model._meta.app_label,
'db_table': model._meta.db_table,
'unique_together': unique_together,
'index_together': index_together,
'indexes': indexes,
'constraints': constraints,
'apps': apps,
}
meta = type("Meta", (), meta_contents)
body_copy['Meta'] = meta
body_copy['__module__'] = model.__module__
type(model._meta.object_name, model.__bases__, body_copy)
# Construct a model with a renamed table name.
body_copy = copy.deepcopy(body)
meta_contents = {
'app_label': model._meta.app_label,
'db_table': 'new__%s' % strip_quotes(model._meta.db_table),
'unique_together': unique_together,
'index_together': index_together,
'indexes': indexes,
'constraints': constraints,
'apps': apps,
}
meta = type("Meta", (), meta_contents)
body_copy['Meta'] = meta
body_copy['__module__'] = model.__module__
new_model = type('New%s' % model._meta.object_name, model.__bases__, body_copy)
# Create a new table with the updated schema.
self.create_model(new_model)
# Copy data from the old table into the new table
self.execute("INSERT INTO %s (%s) SELECT %s FROM %s" % (
self.quote_name(new_model._meta.db_table),
', '.join(self.quote_name(x) for x in mapping),
', '.join(mapping.values()),
self.quote_name(model._meta.db_table),
))
# Delete the old table to make way for the new
self.delete_model(model, handle_autom2m=False)
# Rename the new table to take way for the old
self.alter_db_table(
new_model, new_model._meta.db_table, model._meta.db_table,
disable_constraints=False,
)
# Run deferred SQL on correct table
for sql in self.deferred_sql:
self.execute(sql)
self.deferred_sql = []
# Fix any PK-removed field
if restore_pk_field:
restore_pk_field.primary_key = True
def delete_model(self, model, handle_autom2m=True):
if handle_autom2m:
super().delete_model(model)
else:
# Delete the table (and only that)
self.execute(self.sql_delete_table % {
"table": self.quote_name(model._meta.db_table),
})
# Remove all deferred statements referencing the deleted table.
for sql in list(self.deferred_sql):
if isinstance(sql, Statement) and sql.references_table(model._meta.db_table):
self.deferred_sql.remove(sql)
def add_field(self, model, field):
"""
Create a field on a model. Usually involves adding a column, but may
involve adding a table instead (for M2M fields).
"""
# Special-case implicit M2M tables
if field.many_to_many and field.remote_field.through._meta.auto_created:
return self.create_model(field.remote_field.through)
self._remake_table(model, create_field=field)
def remove_field(self, model, field):
"""
Remove a field from a model. Usually involves deleting a column,
but for M2Ms may involve deleting a table.
"""
# M2M fields are a special case
if field.many_to_many:
# For implicit M2M tables, delete the auto-created table
if field.remote_field.through._meta.auto_created:
self.delete_model(field.remote_field.through)
# For explicit "through" M2M fields, do nothing
# For everything else, remake.
else:
# It might not actually have a column behind it
if field.db_parameters(connection=self.connection)['type'] is None:
return
self._remake_table(model, delete_field=field)
def _alter_field(self, model, old_field, new_field, old_type, new_type,
old_db_params, new_db_params, strict=False):
"""Perform a "physical" (non-ManyToMany) field update."""
# Use "ALTER TABLE ... RENAME COLUMN" if only the column name
# changed and there aren't any constraints.
if (self.connection.features.can_alter_table_rename_column and
old_field.column != new_field.column and
self.column_sql(model, old_field) == self.column_sql(model, new_field) and
not (old_field.remote_field and old_field.db_constraint or
new_field.remote_field and new_field.db_constraint)):
return self.execute(self._rename_field_sql(model._meta.db_table, old_field, new_field, new_type))
# Alter by remaking table
self._remake_table(model, alter_field=(old_field, new_field))
# Rebuild tables with FKs pointing to this field if the PK type changed.
if old_field.primary_key and new_field.primary_key and old_type != new_type:
for rel in new_field.model._meta.related_objects:
if not rel.many_to_many:
self._remake_table(rel.related_model)
def _alter_many_to_many(self, model, old_field, new_field, strict):
"""Alter M2Ms to repoint their to= endpoints."""
if old_field.remote_field.through._meta.db_table == new_field.remote_field.through._meta.db_table:
# The field name didn't change, but some options did; we have to propagate this altering.
self._remake_table(
old_field.remote_field.through,
alter_field=(
# We need the field that points to the target model, so we can tell alter_field to change it -
# this is m2m_reverse_field_name() (as opposed to m2m_field_name, which points to our model)
old_field.remote_field.through._meta.get_field(old_field.m2m_reverse_field_name()),
new_field.remote_field.through._meta.get_field(new_field.m2m_reverse_field_name()),
),
)
return
# Make a new through table
self.create_model(new_field.remote_field.through)
# Copy the data across
self.execute("INSERT INTO %s (%s) SELECT %s FROM %s" % (
self.quote_name(new_field.remote_field.through._meta.db_table),
', '.join([
"id",
new_field.m2m_column_name(),
new_field.m2m_reverse_name(),
]),
', '.join([
"id",
old_field.m2m_column_name(),
old_field.m2m_reverse_name(),
]),
self.quote_name(old_field.remote_field.through._meta.db_table),
))
# Delete the old through table
self.delete_model(old_field.remote_field.through)
def add_constraint(self, model, constraint):
if isinstance(constraint, UniqueConstraint) and constraint.condition:
super().add_constraint(model, constraint)
else:
self._remake_table(model)
def remove_constraint(self, model, constraint):
if isinstance(constraint, UniqueConstraint) and constraint.condition:
super().remove_constraint(model, constraint)
else:
self._remake_table(model)
|
34aea7b435c69081b50bfc2740096d527187781535026fafcc955eed5df9006a | """
Interfaces for serializing Django objects.
Usage::
from django.core import serializers
json = serializers.serialize("json", some_queryset)
objects = list(serializers.deserialize("json", json))
To add your own serializers, use the SERIALIZATION_MODULES setting::
SERIALIZATION_MODULES = {
"csv": "path.to.csv.serializer",
"txt": "path.to.txt.serializer",
}
"""
import importlib
from django.apps import apps
from django.conf import settings
from django.core.serializers.base import SerializerDoesNotExist
# Built-in serializers
BUILTIN_SERIALIZERS = {
"xml": "django.core.serializers.xml_serializer",
"python": "django.core.serializers.python",
"json": "django.core.serializers.json",
"yaml": "django.core.serializers.pyyaml",
}
_serializers = {}
class BadSerializer:
"""
Stub serializer to hold exception raised during registration
This allows the serializer registration to cache serializers and if there
is an error raised in the process of creating a serializer it will be
raised and passed along to the caller when the serializer is used.
"""
internal_use_only = False
def __init__(self, exception):
self.exception = exception
def __call__(self, *args, **kwargs):
raise self.exception
def register_serializer(format, serializer_module, serializers=None):
"""Register a new serializer.
``serializer_module`` should be the fully qualified module name
for the serializer.
If ``serializers`` is provided, the registration will be added
to the provided dictionary.
If ``serializers`` is not provided, the registration will be made
directly into the global register of serializers. Adding serializers
directly is not a thread-safe operation.
"""
if serializers is None and not _serializers:
_load_serializers()
try:
module = importlib.import_module(serializer_module)
except ImportError as exc:
bad_serializer = BadSerializer(exc)
module = type('BadSerializerModule', (), {
'Deserializer': bad_serializer,
'Serializer': bad_serializer,
})
if serializers is None:
_serializers[format] = module
else:
serializers[format] = module
def unregister_serializer(format):
"Unregister a given serializer. This is not a thread-safe operation."
if not _serializers:
_load_serializers()
if format not in _serializers:
raise SerializerDoesNotExist(format)
del _serializers[format]
def get_serializer(format):
if not _serializers:
_load_serializers()
if format not in _serializers:
raise SerializerDoesNotExist(format)
return _serializers[format].Serializer
def get_serializer_formats():
if not _serializers:
_load_serializers()
return list(_serializers)
def get_public_serializer_formats():
if not _serializers:
_load_serializers()
return [k for k, v in _serializers.items() if not v.Serializer.internal_use_only]
def get_deserializer(format):
if not _serializers:
_load_serializers()
if format not in _serializers:
raise SerializerDoesNotExist(format)
return _serializers[format].Deserializer
def serialize(format, queryset, **options):
"""
Serialize a queryset (or any iterator that returns database objects) using
a certain serializer.
"""
s = get_serializer(format)()
s.serialize(queryset, **options)
return s.getvalue()
def deserialize(format, stream_or_string, **options):
"""
Deserialize a stream or a string. Return an iterator that yields ``(obj,
m2m_relation_dict)``, where ``obj`` is an instantiated -- but *unsaved* --
object, and ``m2m_relation_dict`` is a dictionary of ``{m2m_field_name :
list_of_related_objects}``.
"""
d = get_deserializer(format)
return d(stream_or_string, **options)
def _load_serializers():
"""
Register built-in and settings-defined serializers. This is done lazily so
that user code has a chance to (e.g.) set up custom settings without
needing to be careful of import order.
"""
global _serializers
serializers = {}
for format in BUILTIN_SERIALIZERS:
register_serializer(format, BUILTIN_SERIALIZERS[format], serializers)
if hasattr(settings, "SERIALIZATION_MODULES"):
for format in settings.SERIALIZATION_MODULES:
register_serializer(format, settings.SERIALIZATION_MODULES[format], serializers)
_serializers = serializers
def sort_dependencies(app_list):
"""Sort a list of (app_config, models) pairs into a single list of models.
The single list of models is sorted so that any model with a natural key
is serialized before a normal model, and any model with a natural key
dependency has it's dependencies serialized first.
"""
# Process the list of models, and get the list of dependencies
model_dependencies = []
models = set()
for app_config, model_list in app_list:
if model_list is None:
model_list = app_config.get_models()
for model in model_list:
models.add(model)
# Add any explicitly defined dependencies
if hasattr(model, 'natural_key'):
deps = getattr(model.natural_key, 'dependencies', [])
if deps:
deps = [apps.get_model(dep) for dep in deps]
else:
deps = []
# Now add a dependency for any FK relation with a model that
# defines a natural key
for field in model._meta.fields:
if field.remote_field:
rel_model = field.remote_field.model
if hasattr(rel_model, 'natural_key') and rel_model != model:
deps.append(rel_model)
# Also add a dependency for any simple M2M relation with a model
# that defines a natural key. M2M relations with explicit through
# models don't count as dependencies.
for field in model._meta.many_to_many:
if field.remote_field.through._meta.auto_created:
rel_model = field.remote_field.model
if hasattr(rel_model, 'natural_key') and rel_model != model:
deps.append(rel_model)
model_dependencies.append((model, deps))
model_dependencies.reverse()
# Now sort the models to ensure that dependencies are met. This
# is done by repeatedly iterating over the input list of models.
# If all the dependencies of a given model are in the final list,
# that model is promoted to the end of the final list. This process
# continues until the input list is empty, or we do a full iteration
# over the input models without promoting a model to the final list.
# If we do a full iteration without a promotion, that means there are
# circular dependencies in the list.
model_list = []
while model_dependencies:
skipped = []
changed = False
while model_dependencies:
model, deps = model_dependencies.pop()
# If all of the models in the dependency list are either already
# on the final model list, or not on the original serialization list,
# then we've found another model with all it's dependencies satisfied.
if all(d not in models or d in model_list for d in deps):
model_list.append(model)
changed = True
else:
skipped.append((model, deps))
if not changed:
raise RuntimeError(
"Can't resolve dependencies for %s in serialized app list." %
', '.join(
model._meta.label
for model, deps in sorted(skipped, key=lambda obj: obj[0].__name__)
)
)
model_dependencies = skipped
return model_list
|
80c3ba94562aa978991d4d70dd677e9e6e47e9af7f6e0e171bdb1daf41a3a33a | from django.db.models import (
CharField, Expression, Field, FloatField, Func, Lookup, TextField, Value,
)
from django.db.models.expressions import CombinedExpression
from django.db.models.functions import Cast, Coalesce
class SearchVectorExact(Lookup):
lookup_name = 'exact'
def process_rhs(self, qn, connection):
if not hasattr(self.rhs, 'resolve_expression'):
config = getattr(self.lhs, 'config', None)
self.rhs = SearchQuery(self.rhs, config=config)
rhs, rhs_params = super().process_rhs(qn, connection)
return rhs, rhs_params
def as_sql(self, qn, connection):
lhs, lhs_params = self.process_lhs(qn, connection)
rhs, rhs_params = self.process_rhs(qn, connection)
params = lhs_params + rhs_params
return '%s @@ %s = true' % (lhs, rhs), params
class SearchVectorField(Field):
def db_type(self, connection):
return 'tsvector'
class SearchQueryField(Field):
def db_type(self, connection):
return 'tsquery'
class SearchConfig(Expression):
def __init__(self, config):
super().__init__()
if not hasattr(config, 'resolve_expression'):
config = Value(config)
self.config = config
def get_source_expressions(self):
return [self.config]
def set_source_expressions(self, exprs):
self.config, = exprs
def as_sql(self, compiler, connection):
sql, params = compiler.compile(self.config)
return '%s::regconfig' % sql, params
class SearchVectorCombinable:
ADD = '||'
def _combine(self, other, connector, reversed):
if not isinstance(other, SearchVectorCombinable) or not self.config == other.config:
raise TypeError(
'SearchVector can only be combined with other SearchVector '
'instances, got %s.' % type(other).__name__
)
if reversed:
return CombinedSearchVector(other, connector, self, self.config)
return CombinedSearchVector(self, connector, other, self.config)
class SearchVector(SearchVectorCombinable, Func):
function = 'to_tsvector'
arg_joiner = " || ' ' || "
output_field = SearchVectorField()
config = None
def __init__(self, *expressions, **extra):
super().__init__(*expressions, **extra)
config = self.extra.get('config', self.config)
self.config = SearchConfig(config) if config else None
weight = self.extra.get('weight')
if weight is not None and not hasattr(weight, 'resolve_expression'):
weight = Value(weight)
self.weight = weight
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
resolved = super().resolve_expression(query, allow_joins, reuse, summarize, for_save)
if self.config:
resolved.config = self.config.resolve_expression(query, allow_joins, reuse, summarize, for_save)
return resolved
def as_sql(self, compiler, connection, function=None, template=None):
clone = self.copy()
clone.set_source_expressions([
Coalesce(
expression
if isinstance(expression.output_field, (CharField, TextField))
else Cast(expression, TextField()),
Value('')
) for expression in clone.get_source_expressions()
])
config_sql = None
config_params = []
if template is None:
if clone.config:
config_sql, config_params = compiler.compile(clone.config)
template = '%(function)s(%(config)s, %(expressions)s)'
else:
template = clone.template
sql, params = super(SearchVector, clone).as_sql(
compiler, connection, function=function, template=template,
config=config_sql,
)
extra_params = []
if clone.weight:
weight_sql, extra_params = compiler.compile(clone.weight)
sql = 'setweight({}, {})'.format(sql, weight_sql)
return sql, config_params + params + extra_params
class CombinedSearchVector(SearchVectorCombinable, CombinedExpression):
def __init__(self, lhs, connector, rhs, config, output_field=None):
self.config = config
super().__init__(lhs, connector, rhs, output_field)
class SearchQueryCombinable:
BITAND = '&&'
BITOR = '||'
def _combine(self, other, connector, reversed):
if not isinstance(other, SearchQueryCombinable):
raise TypeError(
'SearchQuery can only be combined with other SearchQuery '
'instances, got %s.' % type(other).__name__
)
if reversed:
return CombinedSearchQuery(other, connector, self, self.config)
return CombinedSearchQuery(self, connector, other, self.config)
# On Combinable, these are not implemented to reduce confusion with Q. In
# this case we are actually (ab)using them to do logical combination so
# it's consistent with other usage in Django.
def __or__(self, other):
return self._combine(other, self.BITOR, False)
def __ror__(self, other):
return self._combine(other, self.BITOR, True)
def __and__(self, other):
return self._combine(other, self.BITAND, False)
def __rand__(self, other):
return self._combine(other, self.BITAND, True)
class SearchQuery(SearchQueryCombinable, Value):
output_field = SearchQueryField()
SEARCH_TYPES = {
'plain': 'plainto_tsquery',
'phrase': 'phraseto_tsquery',
'raw': 'to_tsquery',
'websearch': 'websearch_to_tsquery',
}
def __init__(self, value, output_field=None, *, config=None, invert=False, search_type='plain'):
self.config = SearchConfig(config) if config else None
self.invert = invert
if search_type not in self.SEARCH_TYPES:
raise ValueError("Unknown search_type argument '%s'." % search_type)
self.search_type = search_type
super().__init__(value, output_field=output_field)
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
resolved = super().resolve_expression(query, allow_joins, reuse, summarize, for_save)
if self.config:
resolved.config = self.config.resolve_expression(query, allow_joins, reuse, summarize, for_save)
return resolved
def as_sql(self, compiler, connection):
params = [self.value]
function = self.SEARCH_TYPES[self.search_type]
if self.config:
config_sql, config_params = compiler.compile(self.config)
template = '{}({}, %s)'.format(function, config_sql)
params = config_params + [self.value]
else:
template = '{}(%s)'.format(function)
if self.invert:
template = '!!({})'.format(template)
return template, params
def _combine(self, other, connector, reversed):
combined = super()._combine(other, connector, reversed)
combined.output_field = SearchQueryField()
return combined
def __invert__(self):
return type(self)(self.value, config=self.config, invert=not self.invert)
def __str__(self):
result = super().__str__()
return ('~%s' % result) if self.invert else result
class CombinedSearchQuery(SearchQueryCombinable, CombinedExpression):
def __init__(self, lhs, connector, rhs, config, output_field=None):
self.config = config
super().__init__(lhs, connector, rhs, output_field)
def __str__(self):
return '(%s)' % super().__str__()
class SearchRank(Func):
function = 'ts_rank'
output_field = FloatField()
def __init__(self, vector, query, **extra):
if not hasattr(vector, 'resolve_expression'):
vector = SearchVector(vector)
if not hasattr(query, 'resolve_expression'):
query = SearchQuery(query)
weights = extra.get('weights')
if weights is not None and not hasattr(weights, 'resolve_expression'):
weights = Value(weights)
self.weights = weights
super().__init__(vector, query, **extra)
def as_sql(self, compiler, connection, function=None, template=None):
extra_params = []
extra_context = {}
if template is None and self.extra.get('weights'):
if self.weights:
template = '%(function)s(%(weights)s, %(expressions)s)'
weight_sql, extra_params = compiler.compile(self.weights)
extra_context['weights'] = weight_sql
sql, params = super().as_sql(
compiler, connection,
function=function, template=template, **extra_context
)
return sql, extra_params + params
SearchVectorField.register_lookup(SearchVectorExact)
class TrigramBase(Func):
output_field = FloatField()
def __init__(self, expression, string, **extra):
if not hasattr(string, 'resolve_expression'):
string = Value(string)
super().__init__(expression, string, **extra)
class TrigramSimilarity(TrigramBase):
function = 'SIMILARITY'
class TrigramDistance(TrigramBase):
function = ''
arg_joiner = ' <-> '
|
acecec76def0cacb5b5de5cdb2567dd38842d9133e3791af8460c8cd87174abe | from django.contrib.postgres.signals import (
get_citext_oids, get_hstore_oids, register_type_handlers,
)
from django.db import NotSupportedError
from django.db.migrations import AddIndex, RemoveIndex
from django.db.migrations.operations.base import Operation
class CreateExtension(Operation):
reversible = True
def __init__(self, name):
self.name = name
def state_forwards(self, app_label, state):
pass
def database_forwards(self, app_label, schema_editor, from_state, to_state):
if schema_editor.connection.vendor != 'postgresql':
return
schema_editor.execute("CREATE EXTENSION IF NOT EXISTS %s" % schema_editor.quote_name(self.name))
# Clear cached, stale oids.
get_hstore_oids.cache_clear()
get_citext_oids.cache_clear()
# Registering new type handlers cannot be done before the extension is
# installed, otherwise a subsequent data migration would use the same
# connection.
register_type_handlers(schema_editor.connection)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
schema_editor.execute("DROP EXTENSION %s" % schema_editor.quote_name(self.name))
# Clear cached, stale oids.
get_hstore_oids.cache_clear()
get_citext_oids.cache_clear()
def describe(self):
return "Creates extension %s" % self.name
class BloomExtension(CreateExtension):
def __init__(self):
self.name = 'bloom'
class BtreeGinExtension(CreateExtension):
def __init__(self):
self.name = 'btree_gin'
class BtreeGistExtension(CreateExtension):
def __init__(self):
self.name = 'btree_gist'
class CITextExtension(CreateExtension):
def __init__(self):
self.name = 'citext'
class CryptoExtension(CreateExtension):
def __init__(self):
self.name = 'pgcrypto'
class HStoreExtension(CreateExtension):
def __init__(self):
self.name = 'hstore'
class TrigramExtension(CreateExtension):
def __init__(self):
self.name = 'pg_trgm'
class UnaccentExtension(CreateExtension):
def __init__(self):
self.name = 'unaccent'
class NotInTransactionMixin:
def _ensure_not_in_transaction(self, schema_editor):
if schema_editor.connection.in_atomic_block:
raise NotSupportedError(
'The %s operation cannot be executed inside a transaction '
'(set atomic = False on the migration).'
% self.__class__.__name__
)
class AddIndexConcurrently(NotInTransactionMixin, AddIndex):
"""Create an index using PostgreSQL's CREATE INDEX CONCURRENTLY syntax."""
atomic = False
def describe(self):
return 'Concurrently create index %s on field(s) %s of model %s' % (
self.index.name,
', '.join(self.index.fields),
self.model_name,
)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
self._ensure_not_in_transaction(schema_editor)
model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
schema_editor.add_index(model, self.index, concurrently=True)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
self._ensure_not_in_transaction(schema_editor)
model = from_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
schema_editor.remove_index(model, self.index, concurrently=True)
class RemoveIndexConcurrently(NotInTransactionMixin, RemoveIndex):
"""Remove an index using PostgreSQL's DROP INDEX CONCURRENTLY syntax."""
atomic = False
def describe(self):
return 'Concurrently remove index %s from %s' % (self.name, self.model_name)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
self._ensure_not_in_transaction(schema_editor)
model = from_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
from_model_state = from_state.models[app_label, self.model_name_lower]
index = from_model_state.get_index_by_name(self.name)
schema_editor.remove_index(model, index, concurrently=True)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
self._ensure_not_in_transaction(schema_editor)
model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
to_model_state = to_state.models[app_label, self.model_name_lower]
index = to_model_state.get_index_by_name(self.name)
schema_editor.add_index(model, index, concurrently=True)
|
020915fd4792cbd43fb7f586e049ef40bdf815b17917711ea5e67ee98f24d354 | from itertools import chain
from types import MethodType
from django.apps import apps
from django.conf import settings
from django.core import checks
from .management import _get_builtin_permissions
def check_user_model(app_configs=None, **kwargs):
if app_configs is None:
cls = apps.get_model(settings.AUTH_USER_MODEL)
else:
app_label, model_name = settings.AUTH_USER_MODEL.split('.')
for app_config in app_configs:
if app_config.label == app_label:
cls = app_config.get_model(model_name)
break
else:
# Checks might be run against a set of app configs that don't
# include the specified user model. In this case we simply don't
# perform the checks defined below.
return []
errors = []
# Check that REQUIRED_FIELDS is a list
if not isinstance(cls.REQUIRED_FIELDS, (list, tuple)):
errors.append(
checks.Error(
"'REQUIRED_FIELDS' must be a list or tuple.",
obj=cls,
id='auth.E001',
)
)
# Check that the USERNAME FIELD isn't included in REQUIRED_FIELDS.
if cls.USERNAME_FIELD in cls.REQUIRED_FIELDS:
errors.append(
checks.Error(
"The field named as the 'USERNAME_FIELD' "
"for a custom user model must not be included in 'REQUIRED_FIELDS'.",
obj=cls,
id='auth.E002',
)
)
# Check that the username field is unique
if not cls._meta.get_field(cls.USERNAME_FIELD).unique:
if (settings.AUTHENTICATION_BACKENDS ==
['django.contrib.auth.backends.ModelBackend']):
errors.append(
checks.Error(
"'%s.%s' must be unique because it is named as the 'USERNAME_FIELD'." % (
cls._meta.object_name, cls.USERNAME_FIELD
),
obj=cls,
id='auth.E003',
)
)
else:
errors.append(
checks.Warning(
"'%s.%s' is named as the 'USERNAME_FIELD', but it is not unique." % (
cls._meta.object_name, cls.USERNAME_FIELD
),
hint='Ensure that your authentication backend(s) can handle non-unique usernames.',
obj=cls,
id='auth.W004',
)
)
if isinstance(cls().is_anonymous, MethodType):
errors.append(
checks.Critical(
'%s.is_anonymous must be an attribute or property rather than '
'a method. Ignoring this is a security issue as anonymous '
'users will be treated as authenticated!' % cls,
obj=cls,
id='auth.C009',
)
)
if isinstance(cls().is_authenticated, MethodType):
errors.append(
checks.Critical(
'%s.is_authenticated must be an attribute or property rather '
'than a method. Ignoring this is a security issue as anonymous '
'users will be treated as authenticated!' % cls,
obj=cls,
id='auth.C010',
)
)
return errors
def check_models_permissions(app_configs=None, **kwargs):
if app_configs is None:
models = apps.get_models()
else:
models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
Permission = apps.get_model('auth', 'Permission')
permission_name_max_length = Permission._meta.get_field('name').max_length
permission_codename_max_length = Permission._meta.get_field('codename').max_length
errors = []
for model in models:
opts = model._meta
builtin_permissions = dict(_get_builtin_permissions(opts))
# Check builtin permission name length.
max_builtin_permission_name_length = (
max(len(name) for name in builtin_permissions.values())
if builtin_permissions else 0
)
if max_builtin_permission_name_length > permission_name_max_length:
verbose_name_max_length = (
permission_name_max_length - (max_builtin_permission_name_length - len(opts.verbose_name_raw))
)
errors.append(
checks.Error(
"The verbose_name of model '%s' must be at most %d "
"characters for its builtin permission names to be at "
"most %d characters." % (
opts.label, verbose_name_max_length, permission_name_max_length
),
obj=model,
id='auth.E007',
)
)
# Check builtin permission codename length.
max_builtin_permission_codename_length = (
max(len(codename) for codename in builtin_permissions.keys())
if builtin_permissions else 0
)
if max_builtin_permission_codename_length > permission_codename_max_length:
model_name_max_length = permission_codename_max_length - (
max_builtin_permission_codename_length - len(opts.model_name)
)
errors.append(
checks.Error(
"The name of model '%s' must be at most %d characters "
"for its builtin permission codenames to be at most %d "
"characters." % (
opts.label,
model_name_max_length,
permission_codename_max_length,
),
obj=model,
id='auth.E011',
)
)
codenames = set()
for codename, name in opts.permissions:
# Check custom permission name length.
if len(name) > permission_name_max_length:
errors.append(
checks.Error(
"The permission named '%s' of model '%s' is longer "
"than %d characters." % (
name, opts.label, permission_name_max_length,
),
obj=model,
id='auth.E008',
)
)
# Check custom permission codename length.
if len(codename) > permission_codename_max_length:
errors.append(
checks.Error(
"The permission codenamed '%s' of model '%s' is "
"longer than %d characters." % (
codename,
opts.label,
permission_codename_max_length,
),
obj=model,
id='auth.E012',
)
)
# Check custom permissions codename clashing.
if codename in builtin_permissions:
errors.append(
checks.Error(
"The permission codenamed '%s' clashes with a builtin permission "
"for model '%s'." % (codename, opts.label),
obj=model,
id='auth.E005',
)
)
elif codename in codenames:
errors.append(
checks.Error(
"The permission codenamed '%s' is duplicated for "
"model '%s'." % (codename, opts.label),
obj=model,
id='auth.E006',
)
)
codenames.add(codename)
return errors
|
2b9c4655499bb362c0828fdac276936567fad987a09470afa3f81708ad94e5b8 | import copy
import json
import operator
import re
from functools import partial, reduce, update_wrapper
from urllib.parse import quote as urlquote
from django import forms
from django.conf import settings
from django.contrib import messages
from django.contrib.admin import helpers, widgets
from django.contrib.admin.checks import (
BaseModelAdminChecks, InlineModelAdminChecks, ModelAdminChecks,
)
from django.contrib.admin.exceptions import DisallowedModelAdminToField
from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
from django.contrib.admin.utils import (
NestedObjects, construct_change_message, flatten_fieldsets,
get_deleted_objects, lookup_needs_distinct, model_format_dict,
model_ngettext, quote, unquote,
)
from django.contrib.admin.views.autocomplete import AutocompleteJsonView
from django.contrib.admin.widgets import (
AutocompleteSelect, AutocompleteSelectMultiple,
)
from django.contrib.auth import get_permission_codename
from django.core.exceptions import (
FieldDoesNotExist, FieldError, PermissionDenied, ValidationError,
)
from django.core.paginator import Paginator
from django.db import models, router, transaction
from django.db.models.constants import LOOKUP_SEP
from django.forms.formsets import DELETION_FIELD_NAME, all_valid
from django.forms.models import (
BaseInlineFormSet, inlineformset_factory, modelform_defines_fields,
modelform_factory, modelformset_factory,
)
from django.forms.widgets import CheckboxSelectMultiple, SelectMultiple
from django.http import HttpResponseRedirect
from django.http.response import HttpResponseBase
from django.template.response import SimpleTemplateResponse, TemplateResponse
from django.urls import reverse
from django.utils.decorators import method_decorator
from django.utils.html import format_html
from django.utils.http import urlencode
from django.utils.safestring import mark_safe
from django.utils.text import capfirst, format_lazy, get_text_list
from django.utils.translation import gettext as _, ngettext
from django.views.decorators.csrf import csrf_protect
from django.views.generic import RedirectView
IS_POPUP_VAR = '_popup'
TO_FIELD_VAR = '_to_field'
HORIZONTAL, VERTICAL = 1, 2
def get_content_type_for_model(obj):
# Since this module gets imported in the application's root package,
# it cannot import models from other applications at the module level.
from django.contrib.contenttypes.models import ContentType
return ContentType.objects.get_for_model(obj, for_concrete_model=False)
def get_ul_class(radio_style):
return 'radiolist' if radio_style == VERTICAL else 'radiolist inline'
class IncorrectLookupParameters(Exception):
pass
# Defaults for formfield_overrides. ModelAdmin subclasses can change this
# by adding to ModelAdmin.formfield_overrides.
FORMFIELD_FOR_DBFIELD_DEFAULTS = {
models.DateTimeField: {
'form_class': forms.SplitDateTimeField,
'widget': widgets.AdminSplitDateTime
},
models.DateField: {'widget': widgets.AdminDateWidget},
models.TimeField: {'widget': widgets.AdminTimeWidget},
models.TextField: {'widget': widgets.AdminTextareaWidget},
models.URLField: {'widget': widgets.AdminURLFieldWidget},
models.IntegerField: {'widget': widgets.AdminIntegerFieldWidget},
models.BigIntegerField: {'widget': widgets.AdminBigIntegerFieldWidget},
models.CharField: {'widget': widgets.AdminTextInputWidget},
models.ImageField: {'widget': widgets.AdminFileWidget},
models.FileField: {'widget': widgets.AdminFileWidget},
models.EmailField: {'widget': widgets.AdminEmailInputWidget},
models.UUIDField: {'widget': widgets.AdminUUIDInputWidget},
}
csrf_protect_m = method_decorator(csrf_protect)
class BaseModelAdmin(metaclass=forms.MediaDefiningClass):
"""Functionality common to both ModelAdmin and InlineAdmin."""
autocomplete_fields = ()
raw_id_fields = ()
fields = None
exclude = None
fieldsets = None
form = forms.ModelForm
filter_vertical = ()
filter_horizontal = ()
radio_fields = {}
prepopulated_fields = {}
formfield_overrides = {}
readonly_fields = ()
ordering = None
sortable_by = None
view_on_site = True
show_full_result_count = True
checks_class = BaseModelAdminChecks
def check(self, **kwargs):
return self.checks_class().check(self, **kwargs)
def __init__(self):
# Merge FORMFIELD_FOR_DBFIELD_DEFAULTS with the formfield_overrides
# rather than simply overwriting.
overrides = copy.deepcopy(FORMFIELD_FOR_DBFIELD_DEFAULTS)
for k, v in self.formfield_overrides.items():
overrides.setdefault(k, {}).update(v)
self.formfield_overrides = overrides
def formfield_for_dbfield(self, db_field, request, **kwargs):
"""
Hook for specifying the form Field instance for a given database Field
instance.
If kwargs are given, they're passed to the form Field's constructor.
"""
# If the field specifies choices, we don't need to look for special
# admin widgets - we just need to use a select widget of some kind.
if db_field.choices:
return self.formfield_for_choice_field(db_field, request, **kwargs)
# ForeignKey or ManyToManyFields
if isinstance(db_field, (models.ForeignKey, models.ManyToManyField)):
# Combine the field kwargs with any options for formfield_overrides.
# Make sure the passed in **kwargs override anything in
# formfield_overrides because **kwargs is more specific, and should
# always win.
if db_field.__class__ in self.formfield_overrides:
kwargs = {**self.formfield_overrides[db_field.__class__], **kwargs}
# Get the correct formfield.
if isinstance(db_field, models.ForeignKey):
formfield = self.formfield_for_foreignkey(db_field, request, **kwargs)
elif isinstance(db_field, models.ManyToManyField):
formfield = self.formfield_for_manytomany(db_field, request, **kwargs)
# For non-raw_id fields, wrap the widget with a wrapper that adds
# extra HTML -- the "add other" interface -- to the end of the
# rendered output. formfield can be None if it came from a
# OneToOneField with parent_link=True or a M2M intermediary.
if formfield and db_field.name not in self.raw_id_fields:
related_modeladmin = self.admin_site._registry.get(db_field.remote_field.model)
wrapper_kwargs = {}
if related_modeladmin:
wrapper_kwargs.update(
can_add_related=related_modeladmin.has_add_permission(request),
can_change_related=related_modeladmin.has_change_permission(request),
can_delete_related=related_modeladmin.has_delete_permission(request),
can_view_related=related_modeladmin.has_view_permission(request),
)
formfield.widget = widgets.RelatedFieldWidgetWrapper(
formfield.widget, db_field.remote_field, self.admin_site, **wrapper_kwargs
)
return formfield
# If we've got overrides for the formfield defined, use 'em. **kwargs
# passed to formfield_for_dbfield override the defaults.
for klass in db_field.__class__.mro():
if klass in self.formfield_overrides:
kwargs = {**copy.deepcopy(self.formfield_overrides[klass]), **kwargs}
return db_field.formfield(**kwargs)
# For any other type of field, just call its formfield() method.
return db_field.formfield(**kwargs)
def formfield_for_choice_field(self, db_field, request, **kwargs):
"""
Get a form Field for a database Field that has declared choices.
"""
# If the field is named as a radio_field, use a RadioSelect
if db_field.name in self.radio_fields:
# Avoid stomping on custom widget/choices arguments.
if 'widget' not in kwargs:
kwargs['widget'] = widgets.AdminRadioSelect(attrs={
'class': get_ul_class(self.radio_fields[db_field.name]),
})
if 'choices' not in kwargs:
kwargs['choices'] = db_field.get_choices(
include_blank=db_field.blank,
blank_choice=[('', _('None'))]
)
return db_field.formfield(**kwargs)
def get_field_queryset(self, db, db_field, request):
"""
If the ModelAdmin specifies ordering, the queryset should respect that
ordering. Otherwise don't specify the queryset, let the field decide
(return None in that case).
"""
related_admin = self.admin_site._registry.get(db_field.remote_field.model)
if related_admin is not None:
ordering = related_admin.get_ordering(request)
if ordering is not None and ordering != ():
return db_field.remote_field.model._default_manager.using(db).order_by(*ordering)
return None
def formfield_for_foreignkey(self, db_field, request, **kwargs):
"""
Get a form Field for a ForeignKey.
"""
db = kwargs.get('using')
if 'widget' not in kwargs:
if db_field.name in self.get_autocomplete_fields(request):
kwargs['widget'] = AutocompleteSelect(db_field.remote_field, self.admin_site, using=db)
elif db_field.name in self.raw_id_fields:
kwargs['widget'] = widgets.ForeignKeyRawIdWidget(db_field.remote_field, self.admin_site, using=db)
elif db_field.name in self.radio_fields:
kwargs['widget'] = widgets.AdminRadioSelect(attrs={
'class': get_ul_class(self.radio_fields[db_field.name]),
})
kwargs['empty_label'] = _('None') if db_field.blank else None
if 'queryset' not in kwargs:
queryset = self.get_field_queryset(db, db_field, request)
if queryset is not None:
kwargs['queryset'] = queryset
return db_field.formfield(**kwargs)
def formfield_for_manytomany(self, db_field, request, **kwargs):
"""
Get a form Field for a ManyToManyField.
"""
# If it uses an intermediary model that isn't auto created, don't show
# a field in admin.
if not db_field.remote_field.through._meta.auto_created:
return None
db = kwargs.get('using')
autocomplete_fields = self.get_autocomplete_fields(request)
if db_field.name in autocomplete_fields:
kwargs['widget'] = AutocompleteSelectMultiple(db_field.remote_field, self.admin_site, using=db)
elif db_field.name in self.raw_id_fields:
kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.remote_field, self.admin_site, using=db)
elif db_field.name in [*self.filter_vertical, *self.filter_horizontal]:
kwargs['widget'] = widgets.FilteredSelectMultiple(
db_field.verbose_name,
db_field.name in self.filter_vertical
)
if 'queryset' not in kwargs:
queryset = self.get_field_queryset(db, db_field, request)
if queryset is not None:
kwargs['queryset'] = queryset
form_field = db_field.formfield(**kwargs)
if (isinstance(form_field.widget, SelectMultiple) and
not isinstance(form_field.widget, (CheckboxSelectMultiple, AutocompleteSelectMultiple))):
msg = _('Hold down “Control”, or “Command” on a Mac, to select more than one.')
help_text = form_field.help_text
form_field.help_text = format_lazy('{} {}', help_text, msg) if help_text else msg
return form_field
def get_autocomplete_fields(self, request):
"""
Return a list of ForeignKey and/or ManyToMany fields which should use
an autocomplete widget.
"""
return self.autocomplete_fields
def get_view_on_site_url(self, obj=None):
if obj is None or not self.view_on_site:
return None
if callable(self.view_on_site):
return self.view_on_site(obj)
elif self.view_on_site and hasattr(obj, 'get_absolute_url'):
# use the ContentType lookup if view_on_site is True
return reverse('admin:view_on_site', kwargs={
'content_type_id': get_content_type_for_model(obj).pk,
'object_id': obj.pk
})
def get_empty_value_display(self):
"""
Return the empty_value_display set on ModelAdmin or AdminSite.
"""
try:
return mark_safe(self.empty_value_display)
except AttributeError:
return mark_safe(self.admin_site.empty_value_display)
def get_exclude(self, request, obj=None):
"""
Hook for specifying exclude.
"""
return self.exclude
def get_fields(self, request, obj=None):
"""
Hook for specifying fields.
"""
if self.fields:
return self.fields
# _get_form_for_get_fields() is implemented in subclasses.
form = self._get_form_for_get_fields(request, obj)
return [*form.base_fields, *self.get_readonly_fields(request, obj)]
def get_fieldsets(self, request, obj=None):
"""
Hook for specifying fieldsets.
"""
if self.fieldsets:
return self.fieldsets
return [(None, {'fields': self.get_fields(request, obj)})]
def get_inlines(self, request, obj):
"""Hook for specifying custom inlines."""
return self.inlines
def get_ordering(self, request):
"""
Hook for specifying field ordering.
"""
return self.ordering or () # otherwise we might try to *None, which is bad ;)
def get_readonly_fields(self, request, obj=None):
"""
Hook for specifying custom readonly fields.
"""
return self.readonly_fields
def get_prepopulated_fields(self, request, obj=None):
"""
Hook for specifying custom prepopulated fields.
"""
return self.prepopulated_fields
def get_queryset(self, request):
"""
Return a QuerySet of all model instances that can be edited by the
admin site. This is used by changelist_view.
"""
qs = self.model._default_manager.get_queryset()
# TODO: this should be handled by some parameter to the ChangeList.
ordering = self.get_ordering(request)
if ordering:
qs = qs.order_by(*ordering)
return qs
def get_sortable_by(self, request):
"""Hook for specifying which fields can be sorted in the changelist."""
return self.sortable_by if self.sortable_by is not None else self.get_list_display(request)
def lookup_allowed(self, lookup, value):
from django.contrib.admin.filters import SimpleListFilter
model = self.model
# Check FKey lookups that are allowed, so that popups produced by
# ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
# are allowed to work.
for fk_lookup in model._meta.related_fkey_lookups:
# As ``limit_choices_to`` can be a callable, invoke it here.
if callable(fk_lookup):
fk_lookup = fk_lookup()
if (lookup, value) in widgets.url_params_from_lookup_dict(fk_lookup).items():
return True
relation_parts = []
prev_field = None
for part in lookup.split(LOOKUP_SEP):
try:
field = model._meta.get_field(part)
except FieldDoesNotExist:
# Lookups on nonexistent fields are ok, since they're ignored
# later.
break
# It is allowed to filter on values that would be found from local
# model anyways. For example, if you filter on employee__department__id,
# then the id value would be found already from employee__department_id.
if not prev_field or (prev_field.is_relation and
field not in prev_field.get_path_info()[-1].target_fields):
relation_parts.append(part)
if not getattr(field, 'get_path_info', None):
# This is not a relational field, so further parts
# must be transforms.
break
prev_field = field
model = field.get_path_info()[-1].to_opts.model
if len(relation_parts) <= 1:
# Either a local field filter, or no fields at all.
return True
valid_lookups = {self.date_hierarchy}
for filter_item in self.list_filter:
if isinstance(filter_item, type) and issubclass(filter_item, SimpleListFilter):
valid_lookups.add(filter_item.parameter_name)
elif isinstance(filter_item, (list, tuple)):
valid_lookups.add(filter_item[0])
else:
valid_lookups.add(filter_item)
# Is it a valid relational lookup?
return not {
LOOKUP_SEP.join(relation_parts),
LOOKUP_SEP.join(relation_parts + [part])
}.isdisjoint(valid_lookups)
def to_field_allowed(self, request, to_field):
"""
Return True if the model associated with this admin should be
allowed to be referenced by the specified field.
"""
opts = self.model._meta
try:
field = opts.get_field(to_field)
except FieldDoesNotExist:
return False
# Always allow referencing the primary key since it's already possible
# to get this information from the change view URL.
if field.primary_key:
return True
# Allow reverse relationships to models defining m2m fields if they
# target the specified field.
for many_to_many in opts.many_to_many:
if many_to_many.m2m_target_field_name() == to_field:
return True
# Make sure at least one of the models registered for this site
# references this field through a FK or a M2M relationship.
registered_models = set()
for model, admin in self.admin_site._registry.items():
registered_models.add(model)
for inline in admin.inlines:
registered_models.add(inline.model)
related_objects = (
f for f in opts.get_fields(include_hidden=True)
if (f.auto_created and not f.concrete)
)
for related_object in related_objects:
related_model = related_object.related_model
remote_field = related_object.field.remote_field
if (any(issubclass(model, related_model) for model in registered_models) and
hasattr(remote_field, 'get_related_field') and
remote_field.get_related_field() == field):
return True
return False
def has_add_permission(self, request):
"""
Return True if the given request has permission to add an object.
Can be overridden by the user in subclasses.
"""
opts = self.opts
codename = get_permission_codename('add', opts)
return request.user.has_perm("%s.%s" % (opts.app_label, codename))
def has_change_permission(self, request, obj=None):
"""
Return True if the given request has permission to change the given
Django model instance, the default implementation doesn't examine the
`obj` parameter.
Can be overridden by the user in subclasses. In such case it should
return True if the given request has permission to change the `obj`
model instance. If `obj` is None, this should return True if the given
request has permission to change *any* object of the given type.
"""
opts = self.opts
codename = get_permission_codename('change', opts)
return request.user.has_perm("%s.%s" % (opts.app_label, codename))
def has_delete_permission(self, request, obj=None):
"""
Return True if the given request has permission to change the given
Django model instance, the default implementation doesn't examine the
`obj` parameter.
Can be overridden by the user in subclasses. In such case it should
return True if the given request has permission to delete the `obj`
model instance. If `obj` is None, this should return True if the given
request has permission to delete *any* object of the given type.
"""
opts = self.opts
codename = get_permission_codename('delete', opts)
return request.user.has_perm("%s.%s" % (opts.app_label, codename))
def has_view_permission(self, request, obj=None):
"""
Return True if the given request has permission to view the given
Django model instance. The default implementation doesn't examine the
`obj` parameter.
If overridden by the user in subclasses, it should return True if the
given request has permission to view the `obj` model instance. If `obj`
is None, it should return True if the request has permission to view
any object of the given type.
"""
opts = self.opts
codename_view = get_permission_codename('view', opts)
codename_change = get_permission_codename('change', opts)
return (
request.user.has_perm('%s.%s' % (opts.app_label, codename_view)) or
request.user.has_perm('%s.%s' % (opts.app_label, codename_change))
)
def has_view_or_change_permission(self, request, obj=None):
return self.has_view_permission(request, obj) or self.has_change_permission(request, obj)
def has_module_permission(self, request):
"""
Return True if the given request has any permission in the given
app label.
Can be overridden by the user in subclasses. In such case it should
return True if the given request has permission to view the module on
the admin index page and access the module's index page. Overriding it
does not restrict access to the add, change or delete views. Use
`ModelAdmin.has_(add|change|delete)_permission` for that.
"""
return request.user.has_module_perms(self.opts.app_label)
class ModelAdmin(BaseModelAdmin):
"""Encapsulate all admin options and functionality for a given model."""
list_display = ('__str__',)
list_display_links = ()
list_filter = ()
list_select_related = False
list_per_page = 100
list_max_show_all = 200
list_editable = ()
search_fields = ()
date_hierarchy = None
save_as = False
save_as_continue = True
save_on_top = False
paginator = Paginator
preserve_filters = True
inlines = []
# Custom templates (designed to be over-ridden in subclasses)
add_form_template = None
change_form_template = None
change_list_template = None
delete_confirmation_template = None
delete_selected_confirmation_template = None
object_history_template = None
popup_response_template = None
# Actions
actions = []
action_form = helpers.ActionForm
actions_on_top = True
actions_on_bottom = False
actions_selection_counter = True
checks_class = ModelAdminChecks
def __init__(self, model, admin_site):
self.model = model
self.opts = model._meta
self.admin_site = admin_site
super().__init__()
def __str__(self):
return "%s.%s" % (self.model._meta.app_label, self.__class__.__name__)
def get_inline_instances(self, request, obj=None):
inline_instances = []
for inline_class in self.get_inlines(request, obj):
inline = inline_class(self.model, self.admin_site)
if request:
if not (inline.has_view_or_change_permission(request, obj) or
inline.has_add_permission(request, obj) or
inline.has_delete_permission(request, obj)):
continue
if not inline.has_add_permission(request, obj):
inline.max_num = 0
inline_instances.append(inline)
return inline_instances
def get_urls(self):
from django.urls import path
def wrap(view):
def wrapper(*args, **kwargs):
return self.admin_site.admin_view(view)(*args, **kwargs)
wrapper.model_admin = self
return update_wrapper(wrapper, view)
info = self.model._meta.app_label, self.model._meta.model_name
return [
path('', wrap(self.changelist_view), name='%s_%s_changelist' % info),
path('add/', wrap(self.add_view), name='%s_%s_add' % info),
path('autocomplete/', wrap(self.autocomplete_view), name='%s_%s_autocomplete' % info),
path('<path:object_id>/history/', wrap(self.history_view), name='%s_%s_history' % info),
path('<path:object_id>/delete/', wrap(self.delete_view), name='%s_%s_delete' % info),
path('<path:object_id>/change/', wrap(self.change_view), name='%s_%s_change' % info),
# For backwards compatibility (was the change url before 1.9)
path('<path:object_id>/', wrap(RedirectView.as_view(
pattern_name='%s:%s_%s_change' % ((self.admin_site.name,) + info)
))),
]
@property
def urls(self):
return self.get_urls()
@property
def media(self):
extra = '' if settings.DEBUG else '.min'
js = [
'vendor/jquery/jquery%s.js' % extra,
'jquery.init.js',
'core.js',
'admin/RelatedObjectLookups.js',
'actions%s.js' % extra,
'urlify.js',
'prepopulate%s.js' % extra,
'vendor/xregexp/xregexp%s.js' % extra,
]
return forms.Media(js=['admin/js/%s' % url for url in js])
def get_model_perms(self, request):
"""
Return a dict of all perms for this model. This dict has the keys
``add``, ``change``, ``delete``, and ``view`` mapping to the True/False
for each of those actions.
"""
return {
'add': self.has_add_permission(request),
'change': self.has_change_permission(request),
'delete': self.has_delete_permission(request),
'view': self.has_view_permission(request),
}
def _get_form_for_get_fields(self, request, obj):
return self.get_form(request, obj, fields=None)
def get_form(self, request, obj=None, change=False, **kwargs):
"""
Return a Form class for use in the admin add view. This is used by
add_view and change_view.
"""
if 'fields' in kwargs:
fields = kwargs.pop('fields')
else:
fields = flatten_fieldsets(self.get_fieldsets(request, obj))
excluded = self.get_exclude(request, obj)
exclude = [] if excluded is None else list(excluded)
readonly_fields = self.get_readonly_fields(request, obj)
exclude.extend(readonly_fields)
# Exclude all fields if it's a change form and the user doesn't have
# the change permission.
if change and hasattr(request, 'user') and not self.has_change_permission(request, obj):
exclude.extend(fields)
if excluded is None and hasattr(self.form, '_meta') and self.form._meta.exclude:
# Take the custom ModelForm's Meta.exclude into account only if the
# ModelAdmin doesn't define its own.
exclude.extend(self.form._meta.exclude)
# if exclude is an empty list we pass None to be consistent with the
# default on modelform_factory
exclude = exclude or None
# Remove declared form fields which are in readonly_fields.
new_attrs = dict.fromkeys(f for f in readonly_fields if f in self.form.declared_fields)
form = type(self.form.__name__, (self.form,), new_attrs)
defaults = {
'form': form,
'fields': fields,
'exclude': exclude,
'formfield_callback': partial(self.formfield_for_dbfield, request=request),
**kwargs,
}
if defaults['fields'] is None and not modelform_defines_fields(defaults['form']):
defaults['fields'] = forms.ALL_FIELDS
try:
return modelform_factory(self.model, **defaults)
except FieldError as e:
raise FieldError(
'%s. Check fields/fieldsets/exclude attributes of class %s.'
% (e, self.__class__.__name__)
)
def get_changelist(self, request, **kwargs):
"""
Return the ChangeList class for use on the changelist page.
"""
from django.contrib.admin.views.main import ChangeList
return ChangeList
def get_changelist_instance(self, request):
"""
Return a `ChangeList` instance based on `request`. May raise
`IncorrectLookupParameters`.
"""
list_display = self.get_list_display(request)
list_display_links = self.get_list_display_links(request, list_display)
# Add the action checkboxes if any actions are available.
if self.get_actions(request):
list_display = ['action_checkbox', *list_display]
sortable_by = self.get_sortable_by(request)
ChangeList = self.get_changelist(request)
return ChangeList(
request,
self.model,
list_display,
list_display_links,
self.get_list_filter(request),
self.date_hierarchy,
self.get_search_fields(request),
self.get_list_select_related(request),
self.list_per_page,
self.list_max_show_all,
self.list_editable,
self,
sortable_by,
)
def get_object(self, request, object_id, from_field=None):
"""
Return an instance matching the field and value provided, the primary
key is used if no field is provided. Return ``None`` if no match is
found or the object_id fails validation.
"""
queryset = self.get_queryset(request)
model = queryset.model
field = model._meta.pk if from_field is None else model._meta.get_field(from_field)
try:
object_id = field.to_python(object_id)
return queryset.get(**{field.name: object_id})
except (model.DoesNotExist, ValidationError, ValueError):
return None
def get_changelist_form(self, request, **kwargs):
"""
Return a Form class for use in the Formset on the changelist page.
"""
defaults = {
'formfield_callback': partial(self.formfield_for_dbfield, request=request),
**kwargs,
}
if defaults.get('fields') is None and not modelform_defines_fields(defaults.get('form')):
defaults['fields'] = forms.ALL_FIELDS
return modelform_factory(self.model, **defaults)
def get_changelist_formset(self, request, **kwargs):
"""
Return a FormSet class for use on the changelist page if list_editable
is used.
"""
defaults = {
'formfield_callback': partial(self.formfield_for_dbfield, request=request),
**kwargs,
}
return modelformset_factory(
self.model, self.get_changelist_form(request), extra=0,
fields=self.list_editable, **defaults
)
def get_formsets_with_inlines(self, request, obj=None):
"""
Yield formsets and the corresponding inlines.
"""
for inline in self.get_inline_instances(request, obj):
yield inline.get_formset(request, obj), inline
def get_paginator(self, request, queryset, per_page, orphans=0, allow_empty_first_page=True):
return self.paginator(queryset, per_page, orphans, allow_empty_first_page)
def log_addition(self, request, object, message):
"""
Log that an object has been successfully added.
The default implementation creates an admin LogEntry object.
"""
from django.contrib.admin.models import LogEntry, ADDITION
return LogEntry.objects.log_action(
user_id=request.user.pk,
content_type_id=get_content_type_for_model(object).pk,
object_id=object.pk,
object_repr=str(object),
action_flag=ADDITION,
change_message=message,
)
def log_change(self, request, object, message):
"""
Log that an object has been successfully changed.
The default implementation creates an admin LogEntry object.
"""
from django.contrib.admin.models import LogEntry, CHANGE
return LogEntry.objects.log_action(
user_id=request.user.pk,
content_type_id=get_content_type_for_model(object).pk,
object_id=object.pk,
object_repr=str(object),
action_flag=CHANGE,
change_message=message,
)
def log_deletion(self, request, object, object_repr):
"""
Log that an object will be deleted. Note that this method must be
called before the deletion.
The default implementation creates an admin LogEntry object.
"""
from django.contrib.admin.models import LogEntry, DELETION
return LogEntry.objects.log_action(
user_id=request.user.pk,
content_type_id=get_content_type_for_model(object).pk,
object_id=object.pk,
object_repr=object_repr,
action_flag=DELETION,
)
def action_checkbox(self, obj):
"""
A list_display column containing a checkbox widget.
"""
return helpers.checkbox.render(helpers.ACTION_CHECKBOX_NAME, str(obj.pk))
action_checkbox.short_description = mark_safe('<input type="checkbox" id="action-toggle">')
def _get_base_actions(self):
"""Return the list of actions, prior to any request-based filtering."""
actions = []
# Gather actions from the admin site first
for (name, func) in self.admin_site.actions:
description = getattr(func, 'short_description', name.replace('_', ' '))
actions.append((func, name, description))
# Add actions from this ModelAdmin.
actions.extend(self.get_action(action) for action in self.actions or [])
# get_action might have returned None, so filter any of those out.
return filter(None, actions)
def _filter_actions_by_permissions(self, request, actions):
"""Filter out any actions that the user doesn't have access to."""
filtered_actions = []
for action in actions:
callable = action[0]
if not hasattr(callable, 'allowed_permissions'):
filtered_actions.append(action)
continue
permission_checks = (
getattr(self, 'has_%s_permission' % permission)
for permission in callable.allowed_permissions
)
if any(has_permission(request) for has_permission in permission_checks):
filtered_actions.append(action)
return filtered_actions
def get_actions(self, request):
"""
Return a dictionary mapping the names of all actions for this
ModelAdmin to a tuple of (callable, name, description) for each action.
"""
# If self.actions is set to None that means actions are disabled on
# this page.
if self.actions is None or IS_POPUP_VAR in request.GET:
return {}
actions = self._filter_actions_by_permissions(request, self._get_base_actions())
return {name: (func, name, desc) for func, name, desc in actions}
def get_action_choices(self, request, default_choices=models.BLANK_CHOICE_DASH):
"""
Return a list of choices for use in a form object. Each choice is a
tuple (name, description).
"""
choices = [] + default_choices
for func, name, description in self.get_actions(request).values():
choice = (name, description % model_format_dict(self.opts))
choices.append(choice)
return choices
def get_action(self, action):
"""
Return a given action from a parameter, which can either be a callable,
or the name of a method on the ModelAdmin. Return is a tuple of
(callable, name, description).
"""
# If the action is a callable, just use it.
if callable(action):
func = action
action = action.__name__
# Next, look for a method. Grab it off self.__class__ to get an unbound
# method instead of a bound one; this ensures that the calling
# conventions are the same for functions and methods.
elif hasattr(self.__class__, action):
func = getattr(self.__class__, action)
# Finally, look for a named method on the admin site
else:
try:
func = self.admin_site.get_action(action)
except KeyError:
return None
if hasattr(func, 'short_description'):
description = func.short_description
else:
description = capfirst(action.replace('_', ' '))
return func, action, description
def get_list_display(self, request):
"""
Return a sequence containing the fields to be displayed on the
changelist.
"""
return self.list_display
def get_list_display_links(self, request, list_display):
"""
Return a sequence containing the fields to be displayed as links
on the changelist. The list_display parameter is the list of fields
returned by get_list_display().
"""
if self.list_display_links or self.list_display_links is None or not list_display:
return self.list_display_links
else:
# Use only the first item in list_display as link
return list(list_display)[:1]
def get_list_filter(self, request):
"""
Return a sequence containing the fields to be displayed as filters in
the right sidebar of the changelist page.
"""
return self.list_filter
def get_list_select_related(self, request):
"""
Return a list of fields to add to the select_related() part of the
changelist items query.
"""
return self.list_select_related
def get_search_fields(self, request):
"""
Return a sequence containing the fields to be searched whenever
somebody submits a search query.
"""
return self.search_fields
def get_search_results(self, request, queryset, search_term):
"""
Return a tuple containing a queryset to implement the search
and a boolean indicating if the results may contain duplicates.
"""
# Apply keyword searches.
def construct_search(field_name):
if field_name.startswith('^'):
return "%s__istartswith" % field_name[1:]
elif field_name.startswith('='):
return "%s__iexact" % field_name[1:]
elif field_name.startswith('@'):
return "%s__search" % field_name[1:]
# Use field_name if it includes a lookup.
opts = queryset.model._meta
lookup_fields = field_name.split(LOOKUP_SEP)
# Go through the fields, following all relations.
prev_field = None
for path_part in lookup_fields:
if path_part == 'pk':
path_part = opts.pk.name
try:
field = opts.get_field(path_part)
except FieldDoesNotExist:
# Use valid query lookups.
if prev_field and prev_field.get_lookup(path_part):
return field_name
else:
prev_field = field
if hasattr(field, 'get_path_info'):
# Update opts to follow the relation.
opts = field.get_path_info()[-1].to_opts
# Otherwise, use the field with icontains.
return "%s__icontains" % field_name
use_distinct = False
search_fields = self.get_search_fields(request)
if search_fields and search_term:
orm_lookups = [construct_search(str(search_field))
for search_field in search_fields]
for bit in search_term.split():
or_queries = [models.Q(**{orm_lookup: bit})
for orm_lookup in orm_lookups]
queryset = queryset.filter(reduce(operator.or_, or_queries))
use_distinct |= any(lookup_needs_distinct(self.opts, search_spec) for search_spec in orm_lookups)
return queryset, use_distinct
def get_preserved_filters(self, request):
"""
Return the preserved filters querystring.
"""
match = request.resolver_match
if self.preserve_filters and match:
opts = self.model._meta
current_url = '%s:%s' % (match.app_name, match.url_name)
changelist_url = 'admin:%s_%s_changelist' % (opts.app_label, opts.model_name)
if current_url == changelist_url:
preserved_filters = request.GET.urlencode()
else:
preserved_filters = request.GET.get('_changelist_filters')
if preserved_filters:
return urlencode({'_changelist_filters': preserved_filters})
return ''
def construct_change_message(self, request, form, formsets, add=False):
"""
Construct a JSON structure describing changes from a changed object.
"""
return construct_change_message(form, formsets, add)
def message_user(self, request, message, level=messages.INFO, extra_tags='',
fail_silently=False):
"""
Send a message to the user. The default implementation
posts a message using the django.contrib.messages backend.
Exposes almost the same API as messages.add_message(), but accepts the
positional arguments in a different order to maintain backwards
compatibility. For convenience, it accepts the `level` argument as
a string rather than the usual level number.
"""
if not isinstance(level, int):
# attempt to get the level if passed a string
try:
level = getattr(messages.constants, level.upper())
except AttributeError:
levels = messages.constants.DEFAULT_TAGS.values()
levels_repr = ', '.join('`%s`' % l for l in levels)
raise ValueError(
'Bad message level string: `%s`. Possible values are: %s'
% (level, levels_repr)
)
messages.add_message(request, level, message, extra_tags=extra_tags, fail_silently=fail_silently)
def save_form(self, request, form, change):
"""
Given a ModelForm return an unsaved instance. ``change`` is True if
the object is being changed, and False if it's being added.
"""
return form.save(commit=False)
def save_model(self, request, obj, form, change):
"""
Given a model instance save it to the database.
"""
obj.save()
def delete_model(self, request, obj):
"""
Given a model instance delete it from the database.
"""
obj.delete()
def delete_queryset(self, request, queryset):
"""Given a queryset, delete it from the database."""
queryset.delete()
def save_formset(self, request, form, formset, change):
"""
Given an inline formset save it to the database.
"""
formset.save()
def save_related(self, request, form, formsets, change):
"""
Given the ``HttpRequest``, the parent ``ModelForm`` instance, the
list of inline formsets and a boolean value based on whether the
parent is being added or changed, save the related objects to the
database. Note that at this point save_form() and save_model() have
already been called.
"""
form.save_m2m()
for formset in formsets:
self.save_formset(request, form, formset, change=change)
def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
opts = self.model._meta
app_label = opts.app_label
preserved_filters = self.get_preserved_filters(request)
form_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, form_url)
view_on_site_url = self.get_view_on_site_url(obj)
has_editable_inline_admin_formsets = False
for inline in context['inline_admin_formsets']:
if inline.has_add_permission or inline.has_change_permission or inline.has_delete_permission:
has_editable_inline_admin_formsets = True
break
context.update({
'add': add,
'change': change,
'has_view_permission': self.has_view_permission(request, obj),
'has_add_permission': self.has_add_permission(request),
'has_change_permission': self.has_change_permission(request, obj),
'has_delete_permission': self.has_delete_permission(request, obj),
'has_editable_inline_admin_formsets': has_editable_inline_admin_formsets,
'has_file_field': context['adminform'].form.is_multipart() or any(
admin_formset.formset.is_multipart()
for admin_formset in context['inline_admin_formsets']
),
'has_absolute_url': view_on_site_url is not None,
'absolute_url': view_on_site_url,
'form_url': form_url,
'opts': opts,
'content_type_id': get_content_type_for_model(self.model).pk,
'save_as': self.save_as,
'save_on_top': self.save_on_top,
'to_field_var': TO_FIELD_VAR,
'is_popup_var': IS_POPUP_VAR,
'app_label': app_label,
})
if add and self.add_form_template is not None:
form_template = self.add_form_template
else:
form_template = self.change_form_template
request.current_app = self.admin_site.name
return TemplateResponse(request, form_template or [
"admin/%s/%s/change_form.html" % (app_label, opts.model_name),
"admin/%s/change_form.html" % app_label,
"admin/change_form.html"
], context)
def response_add(self, request, obj, post_url_continue=None):
"""
Determine the HttpResponse for the add_view stage.
"""
opts = obj._meta
preserved_filters = self.get_preserved_filters(request)
obj_url = reverse(
'admin:%s_%s_change' % (opts.app_label, opts.model_name),
args=(quote(obj.pk),),
current_app=self.admin_site.name,
)
# Add a link to the object's change form if the user can edit the obj.
if self.has_change_permission(request, obj):
obj_repr = format_html('<a href="{}">{}</a>', urlquote(obj_url), obj)
else:
obj_repr = str(obj)
msg_dict = {
'name': opts.verbose_name,
'obj': obj_repr,
}
# Here, we distinguish between different save types by checking for
# the presence of keys in request.POST.
if IS_POPUP_VAR in request.POST:
to_field = request.POST.get(TO_FIELD_VAR)
if to_field:
attr = str(to_field)
else:
attr = obj._meta.pk.attname
value = obj.serializable_value(attr)
popup_response_data = json.dumps({
'value': str(value),
'obj': str(obj),
})
return TemplateResponse(request, self.popup_response_template or [
'admin/%s/%s/popup_response.html' % (opts.app_label, opts.model_name),
'admin/%s/popup_response.html' % opts.app_label,
'admin/popup_response.html',
], {
'popup_response_data': popup_response_data,
})
elif "_continue" in request.POST or (
# Redirecting after "Save as new".
"_saveasnew" in request.POST and self.save_as_continue and
self.has_change_permission(request, obj)
):
msg = _('The {name} “{obj}” was added successfully.')
if self.has_change_permission(request, obj):
msg += ' ' + _('You may edit it again below.')
self.message_user(request, format_html(msg, **msg_dict), messages.SUCCESS)
if post_url_continue is None:
post_url_continue = obj_url
post_url_continue = add_preserved_filters(
{'preserved_filters': preserved_filters, 'opts': opts},
post_url_continue
)
return HttpResponseRedirect(post_url_continue)
elif "_addanother" in request.POST:
msg = format_html(
_('The {name} “{obj}” was added successfully. You may add another {name} below.'),
**msg_dict
)
self.message_user(request, msg, messages.SUCCESS)
redirect_url = request.path
redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
return HttpResponseRedirect(redirect_url)
else:
msg = format_html(
_('The {name} “{obj}” was added successfully.'),
**msg_dict
)
self.message_user(request, msg, messages.SUCCESS)
return self.response_post_save_add(request, obj)
def response_change(self, request, obj):
"""
Determine the HttpResponse for the change_view stage.
"""
if IS_POPUP_VAR in request.POST:
opts = obj._meta
to_field = request.POST.get(TO_FIELD_VAR)
attr = str(to_field) if to_field else opts.pk.attname
value = request.resolver_match.kwargs['object_id']
new_value = obj.serializable_value(attr)
popup_response_data = json.dumps({
'action': 'change',
'value': str(value),
'obj': str(obj),
'new_value': str(new_value),
})
return TemplateResponse(request, self.popup_response_template or [
'admin/%s/%s/popup_response.html' % (opts.app_label, opts.model_name),
'admin/%s/popup_response.html' % opts.app_label,
'admin/popup_response.html',
], {
'popup_response_data': popup_response_data,
})
opts = self.model._meta
preserved_filters = self.get_preserved_filters(request)
msg_dict = {
'name': opts.verbose_name,
'obj': format_html('<a href="{}">{}</a>', urlquote(request.path), obj),
}
if "_continue" in request.POST:
msg = format_html(
_('The {name} “{obj}” was changed successfully. You may edit it again below.'),
**msg_dict
)
self.message_user(request, msg, messages.SUCCESS)
redirect_url = request.path
redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
return HttpResponseRedirect(redirect_url)
elif "_saveasnew" in request.POST:
msg = format_html(
_('The {name} “{obj}” was added successfully. You may edit it again below.'),
**msg_dict
)
self.message_user(request, msg, messages.SUCCESS)
redirect_url = reverse('admin:%s_%s_change' %
(opts.app_label, opts.model_name),
args=(obj.pk,),
current_app=self.admin_site.name)
redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
return HttpResponseRedirect(redirect_url)
elif "_addanother" in request.POST:
msg = format_html(
_('The {name} “{obj}” was changed successfully. You may add another {name} below.'),
**msg_dict
)
self.message_user(request, msg, messages.SUCCESS)
redirect_url = reverse('admin:%s_%s_add' %
(opts.app_label, opts.model_name),
current_app=self.admin_site.name)
redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
return HttpResponseRedirect(redirect_url)
else:
msg = format_html(
_('The {name} “{obj}” was changed successfully.'),
**msg_dict
)
self.message_user(request, msg, messages.SUCCESS)
return self.response_post_save_change(request, obj)
def _response_post_save(self, request, obj):
opts = self.model._meta
if self.has_view_or_change_permission(request):
post_url = reverse('admin:%s_%s_changelist' %
(opts.app_label, opts.model_name),
current_app=self.admin_site.name)
preserved_filters = self.get_preserved_filters(request)
post_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, post_url)
else:
post_url = reverse('admin:index',
current_app=self.admin_site.name)
return HttpResponseRedirect(post_url)
def response_post_save_add(self, request, obj):
"""
Figure out where to redirect after the 'Save' button has been pressed
when adding a new object.
"""
return self._response_post_save(request, obj)
def response_post_save_change(self, request, obj):
"""
Figure out where to redirect after the 'Save' button has been pressed
when editing an existing object.
"""
return self._response_post_save(request, obj)
def response_action(self, request, queryset):
"""
Handle an admin action. This is called if a request is POSTed to the
changelist; it returns an HttpResponse if the action was handled, and
None otherwise.
"""
# There can be multiple action forms on the page (at the top
# and bottom of the change list, for example). Get the action
# whose button was pushed.
try:
action_index = int(request.POST.get('index', 0))
except ValueError:
action_index = 0
# Construct the action form.
data = request.POST.copy()
data.pop(helpers.ACTION_CHECKBOX_NAME, None)
data.pop("index", None)
# Use the action whose button was pushed
try:
data.update({'action': data.getlist('action')[action_index]})
except IndexError:
# If we didn't get an action from the chosen form that's invalid
# POST data, so by deleting action it'll fail the validation check
# below. So no need to do anything here
pass
action_form = self.action_form(data, auto_id=None)
action_form.fields['action'].choices = self.get_action_choices(request)
# If the form's valid we can handle the action.
if action_form.is_valid():
action = action_form.cleaned_data['action']
select_across = action_form.cleaned_data['select_across']
func = self.get_actions(request)[action][0]
# Get the list of selected PKs. If nothing's selected, we can't
# perform an action on it, so bail. Except we want to perform
# the action explicitly on all objects.
selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)
if not selected and not select_across:
# Reminder that something needs to be selected or nothing will happen
msg = _("Items must be selected in order to perform "
"actions on them. No items have been changed.")
self.message_user(request, msg, messages.WARNING)
return None
if not select_across:
# Perform the action only on the selected objects
queryset = queryset.filter(pk__in=selected)
response = func(self, request, queryset)
# Actions may return an HttpResponse-like object, which will be
# used as the response from the POST. If not, we'll be a good
# little HTTP citizen and redirect back to the changelist page.
if isinstance(response, HttpResponseBase):
return response
else:
return HttpResponseRedirect(request.get_full_path())
else:
msg = _("No action selected.")
self.message_user(request, msg, messages.WARNING)
return None
def response_delete(self, request, obj_display, obj_id):
"""
Determine the HttpResponse for the delete_view stage.
"""
opts = self.model._meta
if IS_POPUP_VAR in request.POST:
popup_response_data = json.dumps({
'action': 'delete',
'value': str(obj_id),
})
return TemplateResponse(request, self.popup_response_template or [
'admin/%s/%s/popup_response.html' % (opts.app_label, opts.model_name),
'admin/%s/popup_response.html' % opts.app_label,
'admin/popup_response.html',
], {
'popup_response_data': popup_response_data,
})
self.message_user(
request,
_('The %(name)s “%(obj)s” was deleted successfully.') % {
'name': opts.verbose_name,
'obj': obj_display,
},
messages.SUCCESS,
)
if self.has_change_permission(request, None):
post_url = reverse(
'admin:%s_%s_changelist' % (opts.app_label, opts.model_name),
current_app=self.admin_site.name,
)
preserved_filters = self.get_preserved_filters(request)
post_url = add_preserved_filters(
{'preserved_filters': preserved_filters, 'opts': opts}, post_url
)
else:
post_url = reverse('admin:index', current_app=self.admin_site.name)
return HttpResponseRedirect(post_url)
def render_delete_form(self, request, context):
opts = self.model._meta
app_label = opts.app_label
request.current_app = self.admin_site.name
context.update(
to_field_var=TO_FIELD_VAR,
is_popup_var=IS_POPUP_VAR,
media=self.media,
)
return TemplateResponse(
request,
self.delete_confirmation_template or [
"admin/{}/{}/delete_confirmation.html".format(app_label, opts.model_name),
"admin/{}/delete_confirmation.html".format(app_label),
"admin/delete_confirmation.html",
],
context,
)
def get_inline_formsets(self, request, formsets, inline_instances, obj=None):
# Edit permissions on parent model are required for editable inlines.
can_edit_parent = self.has_change_permission(request, obj) if obj else self.has_add_permission(request)
inline_admin_formsets = []
for inline, formset in zip(inline_instances, formsets):
fieldsets = list(inline.get_fieldsets(request, obj))
readonly = list(inline.get_readonly_fields(request, obj))
if can_edit_parent:
has_add_permission = inline.has_add_permission(request, obj)
has_change_permission = inline.has_change_permission(request, obj)
has_delete_permission = inline.has_delete_permission(request, obj)
else:
# Disable all edit-permissions, and overide formset settings.
has_add_permission = has_change_permission = has_delete_permission = False
formset.extra = formset.max_num = 0
has_view_permission = inline.has_view_permission(request, obj)
prepopulated = dict(inline.get_prepopulated_fields(request, obj))
inline_admin_formset = helpers.InlineAdminFormSet(
inline, formset, fieldsets, prepopulated, readonly, model_admin=self,
has_add_permission=has_add_permission, has_change_permission=has_change_permission,
has_delete_permission=has_delete_permission, has_view_permission=has_view_permission,
)
inline_admin_formsets.append(inline_admin_formset)
return inline_admin_formsets
def get_changeform_initial_data(self, request):
"""
Get the initial form data from the request's GET params.
"""
initial = dict(request.GET.items())
for k in initial:
try:
f = self.model._meta.get_field(k)
except FieldDoesNotExist:
continue
# We have to special-case M2Ms as a list of comma-separated PKs.
if isinstance(f, models.ManyToManyField):
initial[k] = initial[k].split(",")
return initial
def _get_obj_does_not_exist_redirect(self, request, opts, object_id):
"""
Create a message informing the user that the object doesn't exist
and return a redirect to the admin index page.
"""
msg = _('%(name)s with ID “%(key)s” doesn’t exist. Perhaps it was deleted?') % {
'name': opts.verbose_name,
'key': unquote(object_id),
}
self.message_user(request, msg, messages.WARNING)
url = reverse('admin:index', current_app=self.admin_site.name)
return HttpResponseRedirect(url)
@csrf_protect_m
def changeform_view(self, request, object_id=None, form_url='', extra_context=None):
with transaction.atomic(using=router.db_for_write(self.model)):
return self._changeform_view(request, object_id, form_url, extra_context)
def _changeform_view(self, request, object_id, form_url, extra_context):
to_field = request.POST.get(TO_FIELD_VAR, request.GET.get(TO_FIELD_VAR))
if to_field and not self.to_field_allowed(request, to_field):
raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)
model = self.model
opts = model._meta
if request.method == 'POST' and '_saveasnew' in request.POST:
object_id = None
add = object_id is None
if add:
if not self.has_add_permission(request):
raise PermissionDenied
obj = None
else:
obj = self.get_object(request, unquote(object_id), to_field)
if request.method == 'POST':
if not self.has_change_permission(request, obj):
raise PermissionDenied
else:
if not self.has_view_or_change_permission(request, obj):
raise PermissionDenied
if obj is None:
return self._get_obj_does_not_exist_redirect(request, opts, object_id)
fieldsets = self.get_fieldsets(request, obj)
ModelForm = self.get_form(
request, obj, change=not add, fields=flatten_fieldsets(fieldsets)
)
if request.method == 'POST':
form = ModelForm(request.POST, request.FILES, instance=obj)
form_validated = form.is_valid()
if form_validated:
new_object = self.save_form(request, form, change=not add)
else:
new_object = form.instance
formsets, inline_instances = self._create_formsets(request, new_object, change=not add)
if all_valid(formsets) and form_validated:
self.save_model(request, new_object, form, not add)
self.save_related(request, form, formsets, not add)
change_message = self.construct_change_message(request, form, formsets, add)
if add:
self.log_addition(request, new_object, change_message)
return self.response_add(request, new_object)
else:
self.log_change(request, new_object, change_message)
return self.response_change(request, new_object)
else:
form_validated = False
else:
if add:
initial = self.get_changeform_initial_data(request)
form = ModelForm(initial=initial)
formsets, inline_instances = self._create_formsets(request, form.instance, change=False)
else:
form = ModelForm(instance=obj)
formsets, inline_instances = self._create_formsets(request, obj, change=True)
if not add and not self.has_change_permission(request, obj):
readonly_fields = flatten_fieldsets(fieldsets)
else:
readonly_fields = self.get_readonly_fields(request, obj)
adminForm = helpers.AdminForm(
form,
list(fieldsets),
# Clear prepopulated fields on a view-only form to avoid a crash.
self.get_prepopulated_fields(request, obj) if add or self.has_change_permission(request, obj) else {},
readonly_fields,
model_admin=self)
media = self.media + adminForm.media
inline_formsets = self.get_inline_formsets(request, formsets, inline_instances, obj)
for inline_formset in inline_formsets:
media = media + inline_formset.media
if add:
title = _('Add %s')
elif self.has_change_permission(request, obj):
title = _('Change %s')
else:
title = _('View %s')
context = {
**self.admin_site.each_context(request),
'title': title % opts.verbose_name,
'adminform': adminForm,
'object_id': object_id,
'original': obj,
'is_popup': IS_POPUP_VAR in request.POST or IS_POPUP_VAR in request.GET,
'to_field': to_field,
'media': media,
'inline_admin_formsets': inline_formsets,
'errors': helpers.AdminErrorList(form, formsets),
'preserved_filters': self.get_preserved_filters(request),
}
# Hide the "Save" and "Save and continue" buttons if "Save as New" was
# previously chosen to prevent the interface from getting confusing.
if request.method == 'POST' and not form_validated and "_saveasnew" in request.POST:
context['show_save'] = False
context['show_save_and_continue'] = False
# Use the change template instead of the add template.
add = False
context.update(extra_context or {})
return self.render_change_form(request, context, add=add, change=not add, obj=obj, form_url=form_url)
def autocomplete_view(self, request):
return AutocompleteJsonView.as_view(model_admin=self)(request)
def add_view(self, request, form_url='', extra_context=None):
return self.changeform_view(request, None, form_url, extra_context)
def change_view(self, request, object_id, form_url='', extra_context=None):
return self.changeform_view(request, object_id, form_url, extra_context)
def _get_edited_object_pks(self, request, prefix):
"""Return POST data values of list_editable primary keys."""
pk_pattern = re.compile(
r'{}-\d+-{}$'.format(re.escape(prefix), self.model._meta.pk.name)
)
return [value for key, value in request.POST.items() if pk_pattern.match(key)]
def _get_list_editable_queryset(self, request, prefix):
"""
Based on POST data, return a queryset of the objects that were edited
via list_editable.
"""
object_pks = self._get_edited_object_pks(request, prefix)
queryset = self.get_queryset(request)
validate = queryset.model._meta.pk.to_python
try:
for pk in object_pks:
validate(pk)
except ValidationError:
# Disable the optimization if the POST data was tampered with.
return queryset
return queryset.filter(pk__in=object_pks)
@csrf_protect_m
def changelist_view(self, request, extra_context=None):
"""
The 'change list' admin view for this model.
"""
from django.contrib.admin.views.main import ERROR_FLAG
opts = self.model._meta
app_label = opts.app_label
if not self.has_view_or_change_permission(request):
raise PermissionDenied
try:
cl = self.get_changelist_instance(request)
except IncorrectLookupParameters:
# Wacky lookup parameters were given, so redirect to the main
# changelist page, without parameters, and pass an 'invalid=1'
# parameter via the query string. If wacky parameters were given
# and the 'invalid=1' parameter was already in the query string,
# something is screwed up with the database, so display an error
# page.
if ERROR_FLAG in request.GET:
return SimpleTemplateResponse('admin/invalid_setup.html', {
'title': _('Database error'),
})
return HttpResponseRedirect(request.path + '?' + ERROR_FLAG + '=1')
# If the request was POSTed, this might be a bulk action or a bulk
# edit. Try to look up an action or confirmation first, but if this
# isn't an action the POST will fall through to the bulk edit check,
# below.
action_failed = False
selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)
actions = self.get_actions(request)
# Actions with no confirmation
if (actions and request.method == 'POST' and
'index' in request.POST and '_save' not in request.POST):
if selected:
response = self.response_action(request, queryset=cl.get_queryset(request))
if response:
return response
else:
action_failed = True
else:
msg = _("Items must be selected in order to perform "
"actions on them. No items have been changed.")
self.message_user(request, msg, messages.WARNING)
action_failed = True
# Actions with confirmation
if (actions and request.method == 'POST' and
helpers.ACTION_CHECKBOX_NAME in request.POST and
'index' not in request.POST and '_save' not in request.POST):
if selected:
response = self.response_action(request, queryset=cl.get_queryset(request))
if response:
return response
else:
action_failed = True
if action_failed:
# Redirect back to the changelist page to avoid resubmitting the
# form if the user refreshes the browser or uses the "No, take
# me back" button on the action confirmation page.
return HttpResponseRedirect(request.get_full_path())
# If we're allowing changelist editing, we need to construct a formset
# for the changelist given all the fields to be edited. Then we'll
# use the formset to validate/process POSTed data.
formset = cl.formset = None
# Handle POSTed bulk-edit data.
if request.method == 'POST' and cl.list_editable and '_save' in request.POST:
if not self.has_change_permission(request):
raise PermissionDenied
FormSet = self.get_changelist_formset(request)
modified_objects = self._get_list_editable_queryset(request, FormSet.get_default_prefix())
formset = cl.formset = FormSet(request.POST, request.FILES, queryset=modified_objects)
if formset.is_valid():
changecount = 0
for form in formset.forms:
if form.has_changed():
obj = self.save_form(request, form, change=True)
self.save_model(request, obj, form, change=True)
self.save_related(request, form, formsets=[], change=True)
change_msg = self.construct_change_message(request, form, None)
self.log_change(request, obj, change_msg)
changecount += 1
if changecount:
msg = ngettext(
"%(count)s %(name)s was changed successfully.",
"%(count)s %(name)s were changed successfully.",
changecount
) % {
'count': changecount,
'name': model_ngettext(opts, changecount),
}
self.message_user(request, msg, messages.SUCCESS)
return HttpResponseRedirect(request.get_full_path())
# Handle GET -- construct a formset for display.
elif cl.list_editable and self.has_change_permission(request):
FormSet = self.get_changelist_formset(request)
formset = cl.formset = FormSet(queryset=cl.result_list)
# Build the list of media to be used by the formset.
if formset:
media = self.media + formset.media
else:
media = self.media
# Build the action form and populate it with available actions.
if actions:
action_form = self.action_form(auto_id=None)
action_form.fields['action'].choices = self.get_action_choices(request)
media += action_form.media
else:
action_form = None
selection_note_all = ngettext(
'%(total_count)s selected',
'All %(total_count)s selected',
cl.result_count
)
context = {
**self.admin_site.each_context(request),
'module_name': str(opts.verbose_name_plural),
'selection_note': _('0 of %(cnt)s selected') % {'cnt': len(cl.result_list)},
'selection_note_all': selection_note_all % {'total_count': cl.result_count},
'title': cl.title,
'is_popup': cl.is_popup,
'to_field': cl.to_field,
'cl': cl,
'media': media,
'has_add_permission': self.has_add_permission(request),
'opts': cl.opts,
'action_form': action_form,
'actions_on_top': self.actions_on_top,
'actions_on_bottom': self.actions_on_bottom,
'actions_selection_counter': self.actions_selection_counter,
'preserved_filters': self.get_preserved_filters(request),
**(extra_context or {}),
}
request.current_app = self.admin_site.name
return TemplateResponse(request, self.change_list_template or [
'admin/%s/%s/change_list.html' % (app_label, opts.model_name),
'admin/%s/change_list.html' % app_label,
'admin/change_list.html'
], context)
def get_deleted_objects(self, objs, request):
"""
Hook for customizing the delete process for the delete view and the
"delete selected" action.
"""
return get_deleted_objects(objs, request, self.admin_site)
@csrf_protect_m
def delete_view(self, request, object_id, extra_context=None):
with transaction.atomic(using=router.db_for_write(self.model)):
return self._delete_view(request, object_id, extra_context)
def _delete_view(self, request, object_id, extra_context):
"The 'delete' admin view for this model."
opts = self.model._meta
app_label = opts.app_label
to_field = request.POST.get(TO_FIELD_VAR, request.GET.get(TO_FIELD_VAR))
if to_field and not self.to_field_allowed(request, to_field):
raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)
obj = self.get_object(request, unquote(object_id), to_field)
if not self.has_delete_permission(request, obj):
raise PermissionDenied
if obj is None:
return self._get_obj_does_not_exist_redirect(request, opts, object_id)
# Populate deleted_objects, a data structure of all related objects that
# will also be deleted.
deleted_objects, model_count, perms_needed, protected = self.get_deleted_objects([obj], request)
if request.POST and not protected: # The user has confirmed the deletion.
if perms_needed:
raise PermissionDenied
obj_display = str(obj)
attr = str(to_field) if to_field else opts.pk.attname
obj_id = obj.serializable_value(attr)
self.log_deletion(request, obj, obj_display)
self.delete_model(request, obj)
return self.response_delete(request, obj_display, obj_id)
object_name = str(opts.verbose_name)
if perms_needed or protected:
title = _("Cannot delete %(name)s") % {"name": object_name}
else:
title = _("Are you sure?")
context = {
**self.admin_site.each_context(request),
'title': title,
'object_name': object_name,
'object': obj,
'deleted_objects': deleted_objects,
'model_count': dict(model_count).items(),
'perms_lacking': perms_needed,
'protected': protected,
'opts': opts,
'app_label': app_label,
'preserved_filters': self.get_preserved_filters(request),
'is_popup': IS_POPUP_VAR in request.POST or IS_POPUP_VAR in request.GET,
'to_field': to_field,
**(extra_context or {}),
}
return self.render_delete_form(request, context)
def history_view(self, request, object_id, extra_context=None):
"The 'history' admin view for this model."
from django.contrib.admin.models import LogEntry
# First check if the user can see this history.
model = self.model
obj = self.get_object(request, unquote(object_id))
if obj is None:
return self._get_obj_does_not_exist_redirect(request, model._meta, object_id)
if not self.has_view_or_change_permission(request, obj):
raise PermissionDenied
# Then get the history for this object.
opts = model._meta
app_label = opts.app_label
action_list = LogEntry.objects.filter(
object_id=unquote(object_id),
content_type=get_content_type_for_model(model)
).select_related().order_by('action_time')
context = {
**self.admin_site.each_context(request),
'title': _('Change history: %s') % obj,
'action_list': action_list,
'module_name': str(capfirst(opts.verbose_name_plural)),
'object': obj,
'opts': opts,
'preserved_filters': self.get_preserved_filters(request),
**(extra_context or {}),
}
request.current_app = self.admin_site.name
return TemplateResponse(request, self.object_history_template or [
"admin/%s/%s/object_history.html" % (app_label, opts.model_name),
"admin/%s/object_history.html" % app_label,
"admin/object_history.html"
], context)
def _create_formsets(self, request, obj, change):
"Helper function to generate formsets for add/change_view."
formsets = []
inline_instances = []
prefixes = {}
get_formsets_args = [request]
if change:
get_formsets_args.append(obj)
for FormSet, inline in self.get_formsets_with_inlines(*get_formsets_args):
prefix = FormSet.get_default_prefix()
prefixes[prefix] = prefixes.get(prefix, 0) + 1
if prefixes[prefix] != 1 or not prefix:
prefix = "%s-%s" % (prefix, prefixes[prefix])
formset_params = {
'instance': obj,
'prefix': prefix,
'queryset': inline.get_queryset(request),
}
if request.method == 'POST':
formset_params.update({
'data': request.POST.copy(),
'files': request.FILES,
'save_as_new': '_saveasnew' in request.POST
})
formset = FormSet(**formset_params)
def user_deleted_form(request, obj, formset, index):
"""Return whether or not the user deleted the form."""
return (
inline.has_delete_permission(request, obj) and
'{}-{}-DELETE'.format(formset.prefix, index) in request.POST
)
# Bypass validation of each view-only inline form (since the form's
# data won't be in request.POST), unless the form was deleted.
if not inline.has_change_permission(request, obj if change else None):
for index, form in enumerate(formset.initial_forms):
if user_deleted_form(request, obj, formset, index):
continue
form._errors = {}
form.cleaned_data = form.initial
formsets.append(formset)
inline_instances.append(inline)
return formsets, inline_instances
class InlineModelAdmin(BaseModelAdmin):
"""
Options for inline editing of ``model`` instances.
Provide ``fk_name`` to specify the attribute name of the ``ForeignKey``
from ``model`` to its parent. This is required if ``model`` has more than
one ``ForeignKey`` to its parent.
"""
model = None
fk_name = None
formset = BaseInlineFormSet
extra = 3
min_num = None
max_num = None
template = None
verbose_name = None
verbose_name_plural = None
can_delete = True
show_change_link = False
checks_class = InlineModelAdminChecks
classes = None
def __init__(self, parent_model, admin_site):
self.admin_site = admin_site
self.parent_model = parent_model
self.opts = self.model._meta
self.has_registered_model = admin_site.is_registered(self.model)
super().__init__()
if self.verbose_name is None:
self.verbose_name = self.model._meta.verbose_name
if self.verbose_name_plural is None:
self.verbose_name_plural = self.model._meta.verbose_name_plural
@property
def media(self):
extra = '' if settings.DEBUG else '.min'
js = ['vendor/jquery/jquery%s.js' % extra, 'jquery.init.js',
'inlines%s.js' % extra]
if self.filter_vertical or self.filter_horizontal:
js.extend(['SelectBox.js', 'SelectFilter2.js'])
if self.classes and 'collapse' in self.classes:
js.append('collapse%s.js' % extra)
return forms.Media(js=['admin/js/%s' % url for url in js])
def get_extra(self, request, obj=None, **kwargs):
"""Hook for customizing the number of extra inline forms."""
return self.extra
def get_min_num(self, request, obj=None, **kwargs):
"""Hook for customizing the min number of inline forms."""
return self.min_num
def get_max_num(self, request, obj=None, **kwargs):
"""Hook for customizing the max number of extra inline forms."""
return self.max_num
def get_formset(self, request, obj=None, **kwargs):
"""Return a BaseInlineFormSet class for use in admin add/change views."""
if 'fields' in kwargs:
fields = kwargs.pop('fields')
else:
fields = flatten_fieldsets(self.get_fieldsets(request, obj))
excluded = self.get_exclude(request, obj)
exclude = [] if excluded is None else list(excluded)
exclude.extend(self.get_readonly_fields(request, obj))
if excluded is None and hasattr(self.form, '_meta') and self.form._meta.exclude:
# Take the custom ModelForm's Meta.exclude into account only if the
# InlineModelAdmin doesn't define its own.
exclude.extend(self.form._meta.exclude)
# If exclude is an empty list we use None, since that's the actual
# default.
exclude = exclude or None
can_delete = self.can_delete and self.has_delete_permission(request, obj)
defaults = {
'form': self.form,
'formset': self.formset,
'fk_name': self.fk_name,
'fields': fields,
'exclude': exclude,
'formfield_callback': partial(self.formfield_for_dbfield, request=request),
'extra': self.get_extra(request, obj, **kwargs),
'min_num': self.get_min_num(request, obj, **kwargs),
'max_num': self.get_max_num(request, obj, **kwargs),
'can_delete': can_delete,
**kwargs,
}
base_model_form = defaults['form']
can_change = self.has_change_permission(request, obj) if request else True
can_add = self.has_add_permission(request, obj) if request else True
class DeleteProtectedModelForm(base_model_form):
def hand_clean_DELETE(self):
"""
We don't validate the 'DELETE' field itself because on
templates it's not rendered using the field information, but
just using a generic "deletion_field" of the InlineModelAdmin.
"""
if self.cleaned_data.get(DELETION_FIELD_NAME, False):
using = router.db_for_write(self._meta.model)
collector = NestedObjects(using=using)
if self.instance._state.adding:
return
collector.collect([self.instance])
if collector.protected:
objs = []
for p in collector.protected:
objs.append(
# Translators: Model verbose name and instance representation,
# suitable to be an item in a list.
_('%(class_name)s %(instance)s') % {
'class_name': p._meta.verbose_name,
'instance': p}
)
params = {
'class_name': self._meta.model._meta.verbose_name,
'instance': self.instance,
'related_objects': get_text_list(objs, _('and')),
}
msg = _("Deleting %(class_name)s %(instance)s would require "
"deleting the following protected related objects: "
"%(related_objects)s")
raise ValidationError(msg, code='deleting_protected', params=params)
def is_valid(self):
result = super().is_valid()
self.hand_clean_DELETE()
return result
def has_changed(self):
# Protect against unauthorized edits.
if not can_change and not self.instance._state.adding:
return False
if not can_add and self.instance._state.adding:
return False
return super().has_changed()
defaults['form'] = DeleteProtectedModelForm
if defaults['fields'] is None and not modelform_defines_fields(defaults['form']):
defaults['fields'] = forms.ALL_FIELDS
return inlineformset_factory(self.parent_model, self.model, **defaults)
def _get_form_for_get_fields(self, request, obj=None):
return self.get_formset(request, obj, fields=None).form
def get_queryset(self, request):
queryset = super().get_queryset(request)
if not self.has_view_or_change_permission(request):
queryset = queryset.none()
return queryset
def _has_any_perms_for_target_model(self, request, perms):
"""
This method is called only when the ModelAdmin's model is for an
ManyToManyField's implicit through model (if self.opts.auto_created).
Return True if the user has any of the given permissions ('add',
'change', etc.) for the model that points to the through model.
"""
opts = self.opts
# Find the target model of an auto-created many-to-many relationship.
for field in opts.fields:
if field.remote_field and field.remote_field.model != self.parent_model:
opts = field.remote_field.model._meta
break
return any(
request.user.has_perm('%s.%s' % (opts.app_label, get_permission_codename(perm, opts)))
for perm in perms
)
def has_add_permission(self, request, obj):
if self.opts.auto_created:
# Auto-created intermediate models don't have their own
# permissions. The user needs to have the change permission for the
# related model in order to be able to do anything with the
# intermediate model.
return self._has_any_perms_for_target_model(request, ['change'])
return super().has_add_permission(request)
def has_change_permission(self, request, obj=None):
if self.opts.auto_created:
# Same comment as has_add_permission().
return self._has_any_perms_for_target_model(request, ['change'])
return super().has_change_permission(request)
def has_delete_permission(self, request, obj=None):
if self.opts.auto_created:
# Same comment as has_add_permission().
return self._has_any_perms_for_target_model(request, ['change'])
return super().has_delete_permission(request, obj)
def has_view_permission(self, request, obj=None):
if self.opts.auto_created:
# Same comment as has_add_permission(). The 'change' permission
# also implies the 'view' permission.
return self._has_any_perms_for_target_model(request, ['view', 'change'])
return super().has_view_permission(request)
class StackedInline(InlineModelAdmin):
template = 'admin/edit_inline/stacked.html'
class TabularInline(InlineModelAdmin):
template = 'admin/edit_inline/tabular.html'
|
b1c57c9220abb022c896e326ab3301735f47a6e87b3b813a9b8ba4e917666310 | """
Form Widget classes specific to the Django admin site.
"""
import copy
import json
from django import forms
from django.conf import settings
from django.core.exceptions import ValidationError
from django.core.validators import URLValidator
from django.db.models import CASCADE
from django.urls import reverse
from django.urls.exceptions import NoReverseMatch
from django.utils.html import smart_urlquote
from django.utils.safestring import mark_safe
from django.utils.text import Truncator
from django.utils.translation import get_language, gettext as _
class FilteredSelectMultiple(forms.SelectMultiple):
"""
A SelectMultiple with a JavaScript filter interface.
Note that the resulting JavaScript assumes that the jsi18n
catalog has been loaded in the page
"""
@property
def media(self):
extra = '' if settings.DEBUG else '.min'
js = [
'vendor/jquery/jquery%s.js' % extra,
'jquery.init.js',
'core.js',
'SelectBox.js',
'SelectFilter2.js',
]
return forms.Media(js=["admin/js/%s" % path for path in js])
def __init__(self, verbose_name, is_stacked, attrs=None, choices=()):
self.verbose_name = verbose_name
self.is_stacked = is_stacked
super().__init__(attrs, choices)
def get_context(self, name, value, attrs):
context = super().get_context(name, value, attrs)
context['widget']['attrs']['class'] = 'selectfilter'
if self.is_stacked:
context['widget']['attrs']['class'] += 'stacked'
context['widget']['attrs']['data-field-name'] = self.verbose_name
context['widget']['attrs']['data-is-stacked'] = int(self.is_stacked)
return context
class AdminDateWidget(forms.DateInput):
class Media:
js = [
'admin/js/calendar.js',
'admin/js/admin/DateTimeShortcuts.js',
]
def __init__(self, attrs=None, format=None):
attrs = {'class': 'vDateField', 'size': '10', **(attrs or {})}
super().__init__(attrs=attrs, format=format)
class AdminTimeWidget(forms.TimeInput):
class Media:
js = [
'admin/js/calendar.js',
'admin/js/admin/DateTimeShortcuts.js',
]
def __init__(self, attrs=None, format=None):
attrs = {'class': 'vTimeField', 'size': '8', **(attrs or {})}
super().__init__(attrs=attrs, format=format)
class AdminSplitDateTime(forms.SplitDateTimeWidget):
"""
A SplitDateTime Widget that has some admin-specific styling.
"""
template_name = 'admin/widgets/split_datetime.html'
def __init__(self, attrs=None):
widgets = [AdminDateWidget, AdminTimeWidget]
# Note that we're calling MultiWidget, not SplitDateTimeWidget, because
# we want to define widgets.
forms.MultiWidget.__init__(self, widgets, attrs)
def get_context(self, name, value, attrs):
context = super().get_context(name, value, attrs)
context['date_label'] = _('Date:')
context['time_label'] = _('Time:')
return context
class AdminRadioSelect(forms.RadioSelect):
template_name = 'admin/widgets/radio.html'
class AdminFileWidget(forms.ClearableFileInput):
template_name = 'admin/widgets/clearable_file_input.html'
def url_params_from_lookup_dict(lookups):
"""
Convert the type of lookups specified in a ForeignKey limit_choices_to
attribute to a dictionary of query parameters
"""
params = {}
if lookups and hasattr(lookups, 'items'):
for k, v in lookups.items():
if callable(v):
v = v()
if isinstance(v, (tuple, list)):
v = ','.join(str(x) for x in v)
elif isinstance(v, bool):
v = ('0', '1')[v]
else:
v = str(v)
params[k] = v
return params
class ForeignKeyRawIdWidget(forms.TextInput):
"""
A Widget for displaying ForeignKeys in the "raw_id" interface rather than
in a <select> box.
"""
template_name = 'admin/widgets/foreign_key_raw_id.html'
def __init__(self, rel, admin_site, attrs=None, using=None):
self.rel = rel
self.admin_site = admin_site
self.db = using
super().__init__(attrs)
def get_context(self, name, value, attrs):
context = super().get_context(name, value, attrs)
rel_to = self.rel.model
if rel_to in self.admin_site._registry:
# The related object is registered with the same AdminSite
related_url = reverse(
'admin:%s_%s_changelist' % (
rel_to._meta.app_label,
rel_to._meta.model_name,
),
current_app=self.admin_site.name,
)
params = self.url_parameters()
if params:
related_url += '?' + '&'.join('%s=%s' % (k, v) for k, v in params.items())
context['related_url'] = mark_safe(related_url)
context['link_title'] = _('Lookup')
# The JavaScript code looks for this class.
context['widget']['attrs'].setdefault('class', 'vForeignKeyRawIdAdminField')
else:
context['related_url'] = None
if context['widget']['value']:
context['link_label'], context['link_url'] = self.label_and_url_for_value(value)
else:
context['link_label'] = None
return context
def base_url_parameters(self):
limit_choices_to = self.rel.limit_choices_to
if callable(limit_choices_to):
limit_choices_to = limit_choices_to()
return url_params_from_lookup_dict(limit_choices_to)
def url_parameters(self):
from django.contrib.admin.views.main import TO_FIELD_VAR
params = self.base_url_parameters()
params.update({TO_FIELD_VAR: self.rel.get_related_field().name})
return params
def label_and_url_for_value(self, value):
key = self.rel.get_related_field().name
try:
obj = self.rel.model._default_manager.using(self.db).get(**{key: value})
except (ValueError, self.rel.model.DoesNotExist, ValidationError):
return '', ''
try:
url = reverse(
'%s:%s_%s_change' % (
self.admin_site.name,
obj._meta.app_label,
obj._meta.object_name.lower(),
),
args=(obj.pk,)
)
except NoReverseMatch:
url = '' # Admin not registered for target model.
return Truncator(obj).words(14), url
class ManyToManyRawIdWidget(ForeignKeyRawIdWidget):
"""
A Widget for displaying ManyToMany ids in the "raw_id" interface rather than
in a <select multiple> box.
"""
template_name = 'admin/widgets/many_to_many_raw_id.html'
def get_context(self, name, value, attrs):
context = super().get_context(name, value, attrs)
if self.rel.model in self.admin_site._registry:
# The related object is registered with the same AdminSite
context['widget']['attrs']['class'] = 'vManyToManyRawIdAdminField'
return context
def url_parameters(self):
return self.base_url_parameters()
def label_and_url_for_value(self, value):
return '', ''
def value_from_datadict(self, data, files, name):
value = data.get(name)
if value:
return value.split(',')
def format_value(self, value):
return ','.join(str(v) for v in value) if value else ''
class RelatedFieldWidgetWrapper(forms.Widget):
"""
This class is a wrapper to a given widget to add the add icon for the
admin interface.
"""
template_name = 'admin/widgets/related_widget_wrapper.html'
def __init__(self, widget, rel, admin_site, can_add_related=None,
can_change_related=False, can_delete_related=False,
can_view_related=False):
self.needs_multipart_form = widget.needs_multipart_form
self.attrs = widget.attrs
self.choices = widget.choices
self.widget = widget
self.rel = rel
# Backwards compatible check for whether a user can add related
# objects.
if can_add_related is None:
can_add_related = rel.model in admin_site._registry
self.can_add_related = can_add_related
# XXX: The UX does not support multiple selected values.
multiple = getattr(widget, 'allow_multiple_selected', False)
self.can_change_related = not multiple and can_change_related
# XXX: The deletion UX can be confusing when dealing with cascading deletion.
cascade = getattr(rel, 'on_delete', None) is CASCADE
self.can_delete_related = not multiple and not cascade and can_delete_related
self.can_view_related = not multiple and can_view_related
# so we can check if the related object is registered with this AdminSite
self.admin_site = admin_site
def __deepcopy__(self, memo):
obj = copy.copy(self)
obj.widget = copy.deepcopy(self.widget, memo)
obj.attrs = self.widget.attrs
memo[id(self)] = obj
return obj
@property
def is_hidden(self):
return self.widget.is_hidden
@property
def media(self):
return self.widget.media
def get_related_url(self, info, action, *args):
return reverse("admin:%s_%s_%s" % (info + (action,)),
current_app=self.admin_site.name, args=args)
def get_context(self, name, value, attrs):
from django.contrib.admin.views.main import IS_POPUP_VAR, TO_FIELD_VAR
rel_opts = self.rel.model._meta
info = (rel_opts.app_label, rel_opts.model_name)
self.widget.choices = self.choices
url_params = '&'.join("%s=%s" % param for param in [
(TO_FIELD_VAR, self.rel.get_related_field().name),
(IS_POPUP_VAR, 1),
])
context = {
'rendered_widget': self.widget.render(name, value, attrs),
'is_hidden': self.is_hidden,
'name': name,
'url_params': url_params,
'model': rel_opts.verbose_name,
'can_add_related': self.can_add_related,
'can_change_related': self.can_change_related,
'can_delete_related': self.can_delete_related,
'can_view_related': self.can_view_related,
}
if self.can_add_related:
context['add_related_url'] = self.get_related_url(info, 'add')
if self.can_delete_related:
context['delete_related_template_url'] = self.get_related_url(info, 'delete', '__fk__')
if self.can_view_related or self.can_change_related:
context['change_related_template_url'] = self.get_related_url(info, 'change', '__fk__')
return context
def value_from_datadict(self, data, files, name):
return self.widget.value_from_datadict(data, files, name)
def value_omitted_from_data(self, data, files, name):
return self.widget.value_omitted_from_data(data, files, name)
def id_for_label(self, id_):
return self.widget.id_for_label(id_)
class AdminTextareaWidget(forms.Textarea):
def __init__(self, attrs=None):
super().__init__(attrs={'class': 'vLargeTextField', **(attrs or {})})
class AdminTextInputWidget(forms.TextInput):
def __init__(self, attrs=None):
super().__init__(attrs={'class': 'vTextField', **(attrs or {})})
class AdminEmailInputWidget(forms.EmailInput):
def __init__(self, attrs=None):
super().__init__(attrs={'class': 'vTextField', **(attrs or {})})
class AdminURLFieldWidget(forms.URLInput):
template_name = 'admin/widgets/url.html'
def __init__(self, attrs=None, validator_class=URLValidator):
super().__init__(attrs={'class': 'vURLField', **(attrs or {})})
self.validator = validator_class()
def get_context(self, name, value, attrs):
try:
self.validator(value if value else '')
url_valid = True
except ValidationError:
url_valid = False
context = super().get_context(name, value, attrs)
context['current_label'] = _('Currently:')
context['change_label'] = _('Change:')
context['widget']['href'] = smart_urlquote(context['widget']['value']) if value else ''
context['url_valid'] = url_valid
return context
class AdminIntegerFieldWidget(forms.NumberInput):
class_name = 'vIntegerField'
def __init__(self, attrs=None):
super().__init__(attrs={'class': self.class_name, **(attrs or {})})
class AdminBigIntegerFieldWidget(AdminIntegerFieldWidget):
class_name = 'vBigIntegerField'
class AdminUUIDInputWidget(forms.TextInput):
def __init__(self, attrs=None):
super().__init__(attrs={'class': 'vUUIDField', **(attrs or {})})
# Mapping of lowercase language codes [returned by Django's get_language()] to
# language codes supported by select2.
# See django/contrib/admin/static/admin/js/vendor/select2/i18n/*
SELECT2_TRANSLATIONS = {x.lower(): x for x in [
'ar', 'az', 'bg', 'ca', 'cs', 'da', 'de', 'el', 'en', 'es', 'et',
'eu', 'fa', 'fi', 'fr', 'gl', 'he', 'hi', 'hr', 'hu', 'id', 'is',
'it', 'ja', 'km', 'ko', 'lt', 'lv', 'mk', 'ms', 'nb', 'nl', 'pl',
'pt-BR', 'pt', 'ro', 'ru', 'sk', 'sr-Cyrl', 'sr', 'sv', 'th',
'tr', 'uk', 'vi',
]}
SELECT2_TRANSLATIONS.update({'zh-hans': 'zh-CN', 'zh-hant': 'zh-TW'})
class AutocompleteMixin:
"""
Select widget mixin that loads options from AutocompleteJsonView via AJAX.
Renders the necessary data attributes for select2 and adds the static form
media.
"""
url_name = '%s:%s_%s_autocomplete'
def __init__(self, rel, admin_site, attrs=None, choices=(), using=None):
self.rel = rel
self.admin_site = admin_site
self.db = using
self.choices = choices
self.attrs = {} if attrs is None else attrs.copy()
def get_url(self):
model = self.rel.model
return reverse(self.url_name % (self.admin_site.name, model._meta.app_label, model._meta.model_name))
def build_attrs(self, base_attrs, extra_attrs=None):
"""
Set select2's AJAX attributes.
Attributes can be set using the html5 data attribute.
Nested attributes require a double dash as per
https://select2.org/configuration/data-attributes#nested-subkey-options
"""
attrs = super().build_attrs(base_attrs, extra_attrs=extra_attrs)
attrs.setdefault('class', '')
attrs.update({
'data-ajax--cache': 'true',
'data-ajax--delay': 250,
'data-ajax--type': 'GET',
'data-ajax--url': self.get_url(),
'data-theme': 'admin-autocomplete',
'data-allow-clear': json.dumps(not self.is_required),
'data-placeholder': '', # Allows clearing of the input.
'class': attrs['class'] + (' ' if attrs['class'] else '') + 'admin-autocomplete',
})
return attrs
def optgroups(self, name, value, attr=None):
"""Return selected options based on the ModelChoiceIterator."""
default = (None, [], 0)
groups = [default]
has_selected = False
selected_choices = {
str(v) for v in value
if str(v) not in self.choices.field.empty_values
}
if not self.is_required and not self.allow_multiple_selected:
default[1].append(self.create_option(name, '', '', False, 0))
choices = (
(obj.pk, self.choices.field.label_from_instance(obj))
for obj in self.choices.queryset.using(self.db).filter(pk__in=selected_choices)
)
for option_value, option_label in choices:
selected = (
str(option_value) in value and
(has_selected is False or self.allow_multiple_selected)
)
has_selected |= selected
index = len(default[1])
subgroup = default[1]
subgroup.append(self.create_option(name, option_value, option_label, selected_choices, index))
return groups
@property
def media(self):
extra = '' if settings.DEBUG else '.min'
i18n_name = SELECT2_TRANSLATIONS.get(get_language())
i18n_file = ('admin/js/vendor/select2/i18n/%s.js' % i18n_name,) if i18n_name else ()
return forms.Media(
js=(
'admin/js/vendor/jquery/jquery%s.js' % extra,
'admin/js/vendor/select2/select2.full%s.js' % extra,
) + i18n_file + (
'admin/js/jquery.init.js',
'admin/js/autocomplete.js',
),
css={
'screen': (
'admin/css/vendor/select2/select2%s.css' % extra,
'admin/css/autocomplete.css',
),
},
)
class AutocompleteSelect(AutocompleteMixin, forms.Select):
pass
class AutocompleteSelectMultiple(AutocompleteMixin, forms.SelectMultiple):
pass
|
933a08b9cfedec3de32d6d0c05c50942fa5c5bb48b859c7fee4ecc99989d09b0 | from django.contrib.postgres.fields import ArrayField, JSONField
from django.db.models import Aggregate, Value
from .mixins import OrderableAggMixin
__all__ = [
'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'JSONBAgg', 'StringAgg',
]
class ArrayAgg(OrderableAggMixin, Aggregate):
function = 'ARRAY_AGG'
template = '%(function)s(%(distinct)s%(expressions)s %(ordering)s)'
allow_distinct = True
@property
def output_field(self):
return ArrayField(self.source_expressions[0].output_field)
def convert_value(self, value, expression, connection):
if not value:
return []
return value
class BitAnd(Aggregate):
function = 'BIT_AND'
class BitOr(Aggregate):
function = 'BIT_OR'
class BoolAnd(Aggregate):
function = 'BOOL_AND'
class BoolOr(Aggregate):
function = 'BOOL_OR'
class JSONBAgg(Aggregate):
function = 'JSONB_AGG'
output_field = JSONField()
def convert_value(self, value, expression, connection):
if not value:
return []
return value
class StringAgg(OrderableAggMixin, Aggregate):
function = 'STRING_AGG'
template = '%(function)s(%(distinct)s%(expressions)s %(ordering)s)'
allow_distinct = True
def __init__(self, expression, delimiter, **extra):
delimiter_expr = Value(str(delimiter))
super().__init__(expression, delimiter_expr, **extra)
def convert_value(self, value, expression, connection):
if not value:
return ''
return value
|
19e9c6426551dda0596caf102f5e9f4b59202660623802e4c532bc4621263adf | from datetime import datetime, timedelta
from django import forms
from django.conf import settings
from django.contrib import messages
from django.contrib.admin import FieldListFilter
from django.contrib.admin.exceptions import (
DisallowedModelAdminLookup, DisallowedModelAdminToField,
)
from django.contrib.admin.options import (
IS_POPUP_VAR, TO_FIELD_VAR, IncorrectLookupParameters,
)
from django.contrib.admin.utils import (
get_fields_from_path, lookup_needs_distinct, prepare_lookup_value, quote,
)
from django.core.exceptions import (
FieldDoesNotExist, ImproperlyConfigured, SuspiciousOperation,
)
from django.core.paginator import InvalidPage
from django.db.models import F, Field, ManyToOneRel, OrderBy
from django.db.models.expressions import Combinable
from django.urls import reverse
from django.utils.http import urlencode
from django.utils.timezone import make_aware
from django.utils.translation import gettext
# Changelist settings
ALL_VAR = 'all'
ORDER_VAR = 'o'
ORDER_TYPE_VAR = 'ot'
PAGE_VAR = 'p'
SEARCH_VAR = 'q'
ERROR_FLAG = 'e'
IGNORED_PARAMS = (
ALL_VAR, ORDER_VAR, ORDER_TYPE_VAR, SEARCH_VAR, IS_POPUP_VAR, TO_FIELD_VAR)
class ChangeListSearchForm(forms.Form):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Populate "fields" dynamically because SEARCH_VAR is a variable:
self.fields = {
SEARCH_VAR: forms.CharField(required=False, strip=False),
}
class ChangeList:
search_form_class = ChangeListSearchForm
def __init__(self, request, model, list_display, list_display_links,
list_filter, date_hierarchy, search_fields, list_select_related,
list_per_page, list_max_show_all, list_editable, model_admin, sortable_by):
self.model = model
self.opts = model._meta
self.lookup_opts = self.opts
self.root_queryset = model_admin.get_queryset(request)
self.list_display = list_display
self.list_display_links = list_display_links
self.list_filter = list_filter
self.has_filters = None
self.date_hierarchy = date_hierarchy
self.search_fields = search_fields
self.list_select_related = list_select_related
self.list_per_page = list_per_page
self.list_max_show_all = list_max_show_all
self.model_admin = model_admin
self.preserved_filters = model_admin.get_preserved_filters(request)
self.sortable_by = sortable_by
# Get search parameters from the query string.
_search_form = self.search_form_class(request.GET)
if not _search_form.is_valid():
for error in _search_form.errors.values():
messages.error(request, ', '.join(error))
self.query = _search_form.cleaned_data.get(SEARCH_VAR) or ''
try:
self.page_num = int(request.GET.get(PAGE_VAR, 0))
except ValueError:
self.page_num = 0
self.show_all = ALL_VAR in request.GET
self.is_popup = IS_POPUP_VAR in request.GET
to_field = request.GET.get(TO_FIELD_VAR)
if to_field and not model_admin.to_field_allowed(request, to_field):
raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)
self.to_field = to_field
self.params = dict(request.GET.items())
if PAGE_VAR in self.params:
del self.params[PAGE_VAR]
if ERROR_FLAG in self.params:
del self.params[ERROR_FLAG]
if self.is_popup:
self.list_editable = ()
else:
self.list_editable = list_editable
self.queryset = self.get_queryset(request)
self.get_results(request)
if self.is_popup:
title = gettext('Select %s')
elif self.model_admin.has_change_permission(request):
title = gettext('Select %s to change')
else:
title = gettext('Select %s to view')
self.title = title % self.opts.verbose_name
self.pk_attname = self.lookup_opts.pk.attname
def get_filters_params(self, params=None):
"""
Return all params except IGNORED_PARAMS.
"""
params = params or self.params
lookup_params = params.copy() # a dictionary of the query string
# Remove all the parameters that are globally and systematically
# ignored.
for ignored in IGNORED_PARAMS:
if ignored in lookup_params:
del lookup_params[ignored]
return lookup_params
def get_filters(self, request):
lookup_params = self.get_filters_params()
use_distinct = False
for key, value in lookup_params.items():
if not self.model_admin.lookup_allowed(key, value):
raise DisallowedModelAdminLookup("Filtering by %s not allowed" % key)
filter_specs = []
for list_filter in self.list_filter:
if callable(list_filter):
# This is simply a custom list filter class.
spec = list_filter(request, lookup_params, self.model, self.model_admin)
else:
field_path = None
if isinstance(list_filter, (tuple, list)):
# This is a custom FieldListFilter class for a given field.
field, field_list_filter_class = list_filter
else:
# This is simply a field name, so use the default
# FieldListFilter class that has been registered for the
# type of the given field.
field, field_list_filter_class = list_filter, FieldListFilter.create
if not isinstance(field, Field):
field_path = field
field = get_fields_from_path(self.model, field_path)[-1]
lookup_params_count = len(lookup_params)
spec = field_list_filter_class(
field, request, lookup_params,
self.model, self.model_admin, field_path=field_path,
)
# field_list_filter_class removes any lookup_params it
# processes. If that happened, check if distinct() is needed to
# remove duplicate results.
if lookup_params_count > len(lookup_params):
use_distinct = use_distinct or lookup_needs_distinct(self.lookup_opts, field_path)
if spec and spec.has_output():
filter_specs.append(spec)
if self.date_hierarchy:
# Create bounded lookup parameters so that the query is more
# efficient.
year = lookup_params.pop('%s__year' % self.date_hierarchy, None)
if year is not None:
month = lookup_params.pop('%s__month' % self.date_hierarchy, None)
day = lookup_params.pop('%s__day' % self.date_hierarchy, None)
try:
from_date = datetime(
int(year),
int(month if month is not None else 1),
int(day if day is not None else 1),
)
except ValueError as e:
raise IncorrectLookupParameters(e) from e
if day:
to_date = from_date + timedelta(days=1)
elif month:
# In this branch, from_date will always be the first of a
# month, so advancing 32 days gives the next month.
to_date = (from_date + timedelta(days=32)).replace(day=1)
else:
to_date = from_date.replace(year=from_date.year + 1)
if settings.USE_TZ:
from_date = make_aware(from_date)
to_date = make_aware(to_date)
lookup_params.update({
'%s__gte' % self.date_hierarchy: from_date,
'%s__lt' % self.date_hierarchy: to_date,
})
# At this point, all the parameters used by the various ListFilters
# have been removed from lookup_params, which now only contains other
# parameters passed via the query string. We now loop through the
# remaining parameters both to ensure that all the parameters are valid
# fields and to determine if at least one of them needs distinct(). If
# the lookup parameters aren't real fields, then bail out.
try:
for key, value in lookup_params.items():
lookup_params[key] = prepare_lookup_value(key, value)
use_distinct = use_distinct or lookup_needs_distinct(self.lookup_opts, key)
return filter_specs, bool(filter_specs), lookup_params, use_distinct
except FieldDoesNotExist as e:
raise IncorrectLookupParameters(e) from e
def get_query_string(self, new_params=None, remove=None):
if new_params is None:
new_params = {}
if remove is None:
remove = []
p = self.params.copy()
for r in remove:
for k in list(p):
if k.startswith(r):
del p[k]
for k, v in new_params.items():
if v is None:
if k in p:
del p[k]
else:
p[k] = v
return '?%s' % urlencode(sorted(p.items()))
def get_results(self, request):
paginator = self.model_admin.get_paginator(request, self.queryset, self.list_per_page)
# Get the number of objects, with admin filters applied.
result_count = paginator.count
# Get the total number of objects, with no admin filters applied.
if self.model_admin.show_full_result_count:
full_result_count = self.root_queryset.count()
else:
full_result_count = None
can_show_all = result_count <= self.list_max_show_all
multi_page = result_count > self.list_per_page
# Get the list of objects to display on this page.
if (self.show_all and can_show_all) or not multi_page:
result_list = self.queryset._clone()
else:
try:
result_list = paginator.page(self.page_num + 1).object_list
except InvalidPage:
raise IncorrectLookupParameters
self.result_count = result_count
self.show_full_result_count = self.model_admin.show_full_result_count
# Admin actions are shown if there is at least one entry
# or if entries are not counted because show_full_result_count is disabled
self.show_admin_actions = not self.show_full_result_count or bool(full_result_count)
self.full_result_count = full_result_count
self.result_list = result_list
self.can_show_all = can_show_all
self.multi_page = multi_page
self.paginator = paginator
def _get_default_ordering(self):
ordering = []
if self.model_admin.ordering:
ordering = self.model_admin.ordering
elif self.lookup_opts.ordering:
ordering = self.lookup_opts.ordering
return ordering
def get_ordering_field(self, field_name):
"""
Return the proper model field name corresponding to the given
field_name to use for ordering. field_name may either be the name of a
proper model field or the name of a method (on the admin or model) or a
callable with the 'admin_order_field' attribute. Return None if no
proper model field name can be matched.
"""
try:
field = self.lookup_opts.get_field(field_name)
return field.name
except FieldDoesNotExist:
# See whether field_name is a name of a non-field
# that allows sorting.
if callable(field_name):
attr = field_name
elif hasattr(self.model_admin, field_name):
attr = getattr(self.model_admin, field_name)
else:
attr = getattr(self.model, field_name)
if isinstance(attr, property) and hasattr(attr, 'fget'):
attr = attr.fget
return getattr(attr, 'admin_order_field', None)
def get_ordering(self, request, queryset):
"""
Return the list of ordering fields for the change list.
First check the get_ordering() method in model admin, then check
the object's default ordering. Then, any manually-specified ordering
from the query string overrides anything. Finally, a deterministic
order is guaranteed by calling _get_deterministic_ordering() with the
constructed ordering.
"""
params = self.params
ordering = list(self.model_admin.get_ordering(request) or self._get_default_ordering())
if ORDER_VAR in params:
# Clear ordering and used params
ordering = []
order_params = params[ORDER_VAR].split('.')
for p in order_params:
try:
none, pfx, idx = p.rpartition('-')
field_name = self.list_display[int(idx)]
order_field = self.get_ordering_field(field_name)
if not order_field:
continue # No 'admin_order_field', skip it
if isinstance(order_field, OrderBy):
if pfx == '-':
order_field = order_field.copy()
order_field.reverse_ordering()
ordering.append(order_field)
elif hasattr(order_field, 'resolve_expression'):
# order_field is an expression.
ordering.append(order_field.desc() if pfx == '-' else order_field.asc())
# reverse order if order_field has already "-" as prefix
elif order_field.startswith('-') and pfx == '-':
ordering.append(order_field[1:])
else:
ordering.append(pfx + order_field)
except (IndexError, ValueError):
continue # Invalid ordering specified, skip it.
# Add the given query's ordering fields, if any.
ordering.extend(queryset.query.order_by)
return self._get_deterministic_ordering(ordering)
def _get_deterministic_ordering(self, ordering):
"""
Ensure a deterministic order across all database backends. Search for a
single field or unique together set of fields providing a total
ordering. If these are missing, augment the ordering with a descendant
primary key.
"""
ordering = list(ordering)
ordering_fields = set()
total_ordering_fields = {'pk'} | {
field.attname for field in self.lookup_opts.fields
if field.unique and not field.null
}
for part in ordering:
# Search for single field providing a total ordering.
field_name = None
if isinstance(part, str):
field_name = part.lstrip('-')
elif isinstance(part, F):
field_name = part.name
elif isinstance(part, OrderBy) and isinstance(part.expression, F):
field_name = part.expression.name
if field_name:
# Normalize attname references by using get_field().
try:
field = self.lookup_opts.get_field(field_name)
except FieldDoesNotExist:
# Could be "?" for random ordering or a related field
# lookup. Skip this part of introspection for now.
continue
# Ordering by a related field name orders by the referenced
# model's ordering. Skip this part of introspection for now.
if field.remote_field and field_name == field.name:
continue
if field.attname in total_ordering_fields:
break
ordering_fields.add(field.attname)
else:
# No single total ordering field, try unique_together.
for field_names in self.lookup_opts.unique_together:
# Normalize attname references by using get_field().
fields = [self.lookup_opts.get_field(field_name) for field_name in field_names]
# Composite unique constraints containing a nullable column
# cannot ensure total ordering.
if any(field.null for field in fields):
continue
if ordering_fields.issuperset(field.attname for field in fields):
break
else:
# If no set of unique fields is present in the ordering, rely
# on the primary key to provide total ordering.
ordering.append('-pk')
return ordering
def get_ordering_field_columns(self):
"""
Return a dictionary of ordering field column numbers and asc/desc.
"""
# We must cope with more than one column having the same underlying sort
# field, so we base things on column numbers.
ordering = self._get_default_ordering()
ordering_fields = {}
if ORDER_VAR not in self.params:
# for ordering specified on ModelAdmin or model Meta, we don't know
# the right column numbers absolutely, because there might be more
# than one column associated with that ordering, so we guess.
for field in ordering:
if isinstance(field, (Combinable, OrderBy)):
if not isinstance(field, OrderBy):
field = field.asc()
if isinstance(field.expression, F):
order_type = 'desc' if field.descending else 'asc'
field = field.expression.name
else:
continue
elif field.startswith('-'):
field = field[1:]
order_type = 'desc'
else:
order_type = 'asc'
for index, attr in enumerate(self.list_display):
if self.get_ordering_field(attr) == field:
ordering_fields[index] = order_type
break
else:
for p in self.params[ORDER_VAR].split('.'):
none, pfx, idx = p.rpartition('-')
try:
idx = int(idx)
except ValueError:
continue # skip it
ordering_fields[idx] = 'desc' if pfx == '-' else 'asc'
return ordering_fields
def get_queryset(self, request):
# First, we collect all the declared list filters.
(self.filter_specs, self.has_filters, remaining_lookup_params,
filters_use_distinct) = self.get_filters(request)
# Then, we let every list filter modify the queryset to its liking.
qs = self.root_queryset
for filter_spec in self.filter_specs:
new_qs = filter_spec.queryset(request, qs)
if new_qs is not None:
qs = new_qs
try:
# Finally, we apply the remaining lookup parameters from the query
# string (i.e. those that haven't already been processed by the
# filters).
qs = qs.filter(**remaining_lookup_params)
except (SuspiciousOperation, ImproperlyConfigured):
# Allow certain types of errors to be re-raised as-is so that the
# caller can treat them in a special way.
raise
except Exception as e:
# Every other error is caught with a naked except, because we don't
# have any other way of validating lookup parameters. They might be
# invalid if the keyword arguments are incorrect, or if the values
# are not in the correct type, so we might get FieldError,
# ValueError, ValidationError, or ?.
raise IncorrectLookupParameters(e)
if not qs.query.select_related:
qs = self.apply_select_related(qs)
# Set ordering.
ordering = self.get_ordering(request, qs)
qs = qs.order_by(*ordering)
# Apply search results
qs, search_use_distinct = self.model_admin.get_search_results(request, qs, self.query)
# Remove duplicates from results, if necessary
if filters_use_distinct | search_use_distinct:
return qs.distinct()
else:
return qs
def apply_select_related(self, qs):
if self.list_select_related is True:
return qs.select_related()
if self.list_select_related is False:
if self.has_related_field_in_list_display():
return qs.select_related()
if self.list_select_related:
return qs.select_related(*self.list_select_related)
return qs
def has_related_field_in_list_display(self):
for field_name in self.list_display:
try:
field = self.lookup_opts.get_field(field_name)
except FieldDoesNotExist:
pass
else:
if isinstance(field.remote_field, ManyToOneRel):
# <FK>_id field names don't require a join.
if field_name != field.get_attname():
return True
return False
def url_for_result(self, result):
pk = getattr(result, self.pk_attname)
return reverse('admin:%s_%s_change' % (self.opts.app_label,
self.opts.model_name),
args=(quote(pk),),
current_app=self.model_admin.admin_site.name)
|
98eee2ea97af441105d82e2955d4129eab87b5a7ceb0e62ee5775e3dad8ef452 | from django.contrib.gis.db.models.fields import (
ExtentField, GeometryCollectionField, GeometryField, LineStringField,
)
from django.db.models import Aggregate
from django.utils.functional import cached_property
__all__ = ['Collect', 'Extent', 'Extent3D', 'MakeLine', 'Union']
class GeoAggregate(Aggregate):
function = None
is_extent = False
@cached_property
def output_field(self):
return self.output_field_class(self.source_expressions[0].output_field.srid)
def as_sql(self, compiler, connection, function=None, **extra_context):
# this will be called again in parent, but it's needed now - before
# we get the spatial_aggregate_name
connection.ops.check_expression_support(self)
return super().as_sql(
compiler,
connection,
function=function or connection.ops.spatial_aggregate_name(self.name),
**extra_context
)
def as_oracle(self, compiler, connection, **extra_context):
tolerance = self.extra.get('tolerance') or getattr(self, 'tolerance', 0.05)
template = None if self.is_extent else '%(function)s(SDOAGGRTYPE(%(expressions)s,%(tolerance)s))'
return self.as_sql(compiler, connection, template=template, tolerance=tolerance, **extra_context)
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
c = super().resolve_expression(query, allow_joins, reuse, summarize, for_save)
for expr in c.get_source_expressions():
if not hasattr(expr.field, 'geom_type'):
raise ValueError('Geospatial aggregates only allowed on geometry fields.')
return c
class Collect(GeoAggregate):
name = 'Collect'
output_field_class = GeometryCollectionField
class Extent(GeoAggregate):
name = 'Extent'
is_extent = '2D'
def __init__(self, expression, **extra):
super().__init__(expression, output_field=ExtentField(), **extra)
def convert_value(self, value, expression, connection):
return connection.ops.convert_extent(value)
class Extent3D(GeoAggregate):
name = 'Extent3D'
is_extent = '3D'
def __init__(self, expression, **extra):
super().__init__(expression, output_field=ExtentField(), **extra)
def convert_value(self, value, expression, connection):
return connection.ops.convert_extent3d(value)
class MakeLine(GeoAggregate):
name = 'MakeLine'
output_field_class = LineStringField
class Union(GeoAggregate):
name = 'Union'
output_field_class = GeometryField
|
3e0f5ef28ffd8091733b82d2581c5d24ce7055e2fff4b17c547d126106f5d70c | from decimal import Decimal
from django.contrib.gis.db.models.fields import BaseSpatialField, GeometryField
from django.contrib.gis.db.models.sql import AreaField, DistanceField
from django.contrib.gis.geos import GEOSGeometry
from django.core.exceptions import FieldError
from django.db import NotSupportedError
from django.db.models import (
BinaryField, BooleanField, FloatField, Func, IntegerField, TextField,
Transform, Value,
)
from django.db.models.functions import Cast
from django.utils.functional import cached_property
NUMERIC_TYPES = (int, float, Decimal)
class GeoFuncMixin:
function = None
geom_param_pos = (0,)
def __init__(self, *expressions, **extra):
super().__init__(*expressions, **extra)
# Ensure that value expressions are geometric.
for pos in self.geom_param_pos:
expr = self.source_expressions[pos]
if not isinstance(expr, Value):
continue
try:
output_field = expr.output_field
except FieldError:
output_field = None
geom = expr.value
if not isinstance(geom, GEOSGeometry) or output_field and not isinstance(output_field, GeometryField):
raise TypeError("%s function requires a geometric argument in position %d." % (self.name, pos + 1))
if not geom.srid and not output_field:
raise ValueError("SRID is required for all geometries.")
if not output_field:
self.source_expressions[pos] = Value(geom, output_field=GeometryField(srid=geom.srid))
@property
def name(self):
return self.__class__.__name__
@cached_property
def geo_field(self):
return self.source_expressions[self.geom_param_pos[0]].field
def as_sql(self, compiler, connection, function=None, **extra_context):
if self.function is None and function is None:
function = connection.ops.spatial_function_name(self.name)
return super().as_sql(compiler, connection, function=function, **extra_context)
def resolve_expression(self, *args, **kwargs):
res = super().resolve_expression(*args, **kwargs)
# Ensure that expressions are geometric.
source_fields = res.get_source_fields()
for pos in self.geom_param_pos:
field = source_fields[pos]
if not isinstance(field, GeometryField):
raise TypeError(
"%s function requires a GeometryField in position %s, got %s." % (
self.name, pos + 1, type(field).__name__,
)
)
base_srid = res.geo_field.srid
for pos in self.geom_param_pos[1:]:
expr = res.source_expressions[pos]
expr_srid = expr.output_field.srid
if expr_srid != base_srid:
# Automatic SRID conversion so objects are comparable.
res.source_expressions[pos] = Transform(expr, base_srid).resolve_expression(*args, **kwargs)
return res
def _handle_param(self, value, param_name='', check_types=None):
if not hasattr(value, 'resolve_expression'):
if check_types and not isinstance(value, check_types):
raise TypeError(
"The %s parameter has the wrong type: should be %s." % (
param_name, check_types)
)
return value
class GeoFunc(GeoFuncMixin, Func):
pass
class GeomOutputGeoFunc(GeoFunc):
@cached_property
def output_field(self):
return GeometryField(srid=self.geo_field.srid)
class SQLiteDecimalToFloatMixin:
"""
By default, Decimal values are converted to str by the SQLite backend, which
is not acceptable by the GIS functions expecting numeric values.
"""
def as_sqlite(self, compiler, connection, **extra_context):
for expr in self.get_source_expressions():
if hasattr(expr, 'value') and isinstance(expr.value, Decimal):
expr.value = float(expr.value)
return super().as_sql(compiler, connection, **extra_context)
class OracleToleranceMixin:
tolerance = 0.05
def as_oracle(self, compiler, connection, **extra_context):
tol = self.extra.get('tolerance', self.tolerance)
return self.as_sql(
compiler, connection,
template="%%(function)s(%%(expressions)s, %s)" % tol,
**extra_context
)
class Area(OracleToleranceMixin, GeoFunc):
arity = 1
@cached_property
def output_field(self):
return AreaField(self.geo_field)
def as_sql(self, compiler, connection, **extra_context):
if not connection.features.supports_area_geodetic and self.geo_field.geodetic(connection):
raise NotSupportedError('Area on geodetic coordinate systems not supported.')
return super().as_sql(compiler, connection, **extra_context)
def as_sqlite(self, compiler, connection, **extra_context):
if self.geo_field.geodetic(connection):
extra_context['template'] = '%(function)s(%(expressions)s, %(spheroid)d)'
extra_context['spheroid'] = True
return self.as_sql(compiler, connection, **extra_context)
class Azimuth(GeoFunc):
output_field = FloatField()
arity = 2
geom_param_pos = (0, 1)
class AsGeoJSON(GeoFunc):
output_field = TextField()
def __init__(self, expression, bbox=False, crs=False, precision=8, **extra):
expressions = [expression]
if precision is not None:
expressions.append(self._handle_param(precision, 'precision', int))
options = 0
if crs and bbox:
options = 3
elif bbox:
options = 1
elif crs:
options = 2
if options:
expressions.append(options)
super().__init__(*expressions, **extra)
def as_oracle(self, compiler, connection, **extra_context):
source_expressions = self.get_source_expressions()
clone = self.copy()
clone.set_source_expressions(source_expressions[:1])
return super(AsGeoJSON, clone).as_sql(compiler, connection, **extra_context)
class AsGML(GeoFunc):
geom_param_pos = (1,)
output_field = TextField()
def __init__(self, expression, version=2, precision=8, **extra):
expressions = [version, expression]
if precision is not None:
expressions.append(self._handle_param(precision, 'precision', int))
super().__init__(*expressions, **extra)
def as_oracle(self, compiler, connection, **extra_context):
source_expressions = self.get_source_expressions()
version = source_expressions[0]
clone = self.copy()
clone.set_source_expressions([source_expressions[1]])
extra_context['function'] = 'SDO_UTIL.TO_GML311GEOMETRY' if version.value == 3 else 'SDO_UTIL.TO_GMLGEOMETRY'
return super(AsGML, clone).as_sql(compiler, connection, **extra_context)
class AsKML(AsGML):
def as_sqlite(self, compiler, connection, **extra_context):
# No version parameter
clone = self.copy()
clone.set_source_expressions(self.get_source_expressions()[1:])
return clone.as_sql(compiler, connection, **extra_context)
class AsSVG(GeoFunc):
output_field = TextField()
def __init__(self, expression, relative=False, precision=8, **extra):
relative = relative if hasattr(relative, 'resolve_expression') else int(relative)
expressions = [
expression,
relative,
self._handle_param(precision, 'precision', int),
]
super().__init__(*expressions, **extra)
class AsWKB(GeoFunc):
output_field = BinaryField()
arity = 1
class AsWKT(GeoFunc):
output_field = TextField()
arity = 1
class BoundingCircle(OracleToleranceMixin, GeoFunc):
def __init__(self, expression, num_seg=48, **extra):
super().__init__(expression, num_seg, **extra)
def as_oracle(self, compiler, connection, **extra_context):
clone = self.copy()
clone.set_source_expressions([self.get_source_expressions()[0]])
return super(BoundingCircle, clone).as_oracle(compiler, connection, **extra_context)
class Centroid(OracleToleranceMixin, GeomOutputGeoFunc):
arity = 1
class Difference(OracleToleranceMixin, GeomOutputGeoFunc):
arity = 2
geom_param_pos = (0, 1)
class DistanceResultMixin:
@cached_property
def output_field(self):
return DistanceField(self.geo_field)
def source_is_geography(self):
return self.geo_field.geography and self.geo_field.srid == 4326
class Distance(DistanceResultMixin, OracleToleranceMixin, GeoFunc):
geom_param_pos = (0, 1)
spheroid = None
def __init__(self, expr1, expr2, spheroid=None, **extra):
expressions = [expr1, expr2]
if spheroid is not None:
self.spheroid = self._handle_param(spheroid, 'spheroid', bool)
super().__init__(*expressions, **extra)
def as_postgresql(self, compiler, connection, **extra_context):
clone = self.copy()
function = None
expr2 = clone.source_expressions[1]
geography = self.source_is_geography()
if expr2.output_field.geography != geography:
if isinstance(expr2, Value):
expr2.output_field.geography = geography
else:
clone.source_expressions[1] = Cast(
expr2,
GeometryField(srid=expr2.output_field.srid, geography=geography),
)
if not geography and self.geo_field.geodetic(connection):
# Geometry fields with geodetic (lon/lat) coordinates need special distance functions
if self.spheroid:
# DistanceSpheroid is more accurate and resource intensive than DistanceSphere
function = connection.ops.spatial_function_name('DistanceSpheroid')
# Replace boolean param by the real spheroid of the base field
clone.source_expressions.append(Value(self.geo_field.spheroid(connection)))
else:
function = connection.ops.spatial_function_name('DistanceSphere')
return super(Distance, clone).as_sql(compiler, connection, function=function, **extra_context)
def as_sqlite(self, compiler, connection, **extra_context):
if self.geo_field.geodetic(connection):
# SpatiaLite returns NULL instead of zero on geodetic coordinates
extra_context['template'] = 'COALESCE(%(function)s(%(expressions)s, %(spheroid)s), 0)'
extra_context['spheroid'] = int(bool(self.spheroid))
return super().as_sql(compiler, connection, **extra_context)
class Envelope(GeomOutputGeoFunc):
arity = 1
class ForcePolygonCW(GeomOutputGeoFunc):
arity = 1
class GeoHash(GeoFunc):
output_field = TextField()
def __init__(self, expression, precision=None, **extra):
expressions = [expression]
if precision is not None:
expressions.append(self._handle_param(precision, 'precision', int))
super().__init__(*expressions, **extra)
def as_mysql(self, compiler, connection, **extra_context):
clone = self.copy()
# If no precision is provided, set it to the maximum.
if len(clone.source_expressions) < 2:
clone.source_expressions.append(Value(100))
return clone.as_sql(compiler, connection, **extra_context)
class GeometryDistance(GeoFunc):
output_field = FloatField()
arity = 2
function = ''
arg_joiner = ' <-> '
geom_param_pos = (0, 1)
class Intersection(OracleToleranceMixin, GeomOutputGeoFunc):
arity = 2
geom_param_pos = (0, 1)
@BaseSpatialField.register_lookup
class IsValid(OracleToleranceMixin, GeoFuncMixin, Transform):
lookup_name = 'isvalid'
output_field = BooleanField()
def as_oracle(self, compiler, connection, **extra_context):
sql, params = super().as_oracle(compiler, connection, **extra_context)
return "CASE %s WHEN 'TRUE' THEN 1 ELSE 0 END" % sql, params
class Length(DistanceResultMixin, OracleToleranceMixin, GeoFunc):
def __init__(self, expr1, spheroid=True, **extra):
self.spheroid = spheroid
super().__init__(expr1, **extra)
def as_sql(self, compiler, connection, **extra_context):
if self.geo_field.geodetic(connection) and not connection.features.supports_length_geodetic:
raise NotSupportedError("This backend doesn't support Length on geodetic fields")
return super().as_sql(compiler, connection, **extra_context)
def as_postgresql(self, compiler, connection, **extra_context):
clone = self.copy()
function = None
if self.source_is_geography():
clone.source_expressions.append(Value(self.spheroid))
elif self.geo_field.geodetic(connection):
# Geometry fields with geodetic (lon/lat) coordinates need length_spheroid
function = connection.ops.spatial_function_name('LengthSpheroid')
clone.source_expressions.append(Value(self.geo_field.spheroid(connection)))
else:
dim = min(f.dim for f in self.get_source_fields() if f)
if dim > 2:
function = connection.ops.length3d
return super(Length, clone).as_sql(compiler, connection, function=function, **extra_context)
def as_sqlite(self, compiler, connection, **extra_context):
function = None
if self.geo_field.geodetic(connection):
function = 'GeodesicLength' if self.spheroid else 'GreatCircleLength'
return super().as_sql(compiler, connection, function=function, **extra_context)
class LineLocatePoint(GeoFunc):
output_field = FloatField()
arity = 2
geom_param_pos = (0, 1)
class MakeValid(GeomOutputGeoFunc):
pass
class MemSize(GeoFunc):
output_field = IntegerField()
arity = 1
class NumGeometries(GeoFunc):
output_field = IntegerField()
arity = 1
class NumPoints(GeoFunc):
output_field = IntegerField()
arity = 1
class Perimeter(DistanceResultMixin, OracleToleranceMixin, GeoFunc):
arity = 1
def as_postgresql(self, compiler, connection, **extra_context):
function = None
if self.geo_field.geodetic(connection) and not self.source_is_geography():
raise NotSupportedError("ST_Perimeter cannot use a non-projected non-geography field.")
dim = min(f.dim for f in self.get_source_fields())
if dim > 2:
function = connection.ops.perimeter3d
return super().as_sql(compiler, connection, function=function, **extra_context)
def as_sqlite(self, compiler, connection, **extra_context):
if self.geo_field.geodetic(connection):
raise NotSupportedError("Perimeter cannot use a non-projected field.")
return super().as_sql(compiler, connection, **extra_context)
class PointOnSurface(OracleToleranceMixin, GeomOutputGeoFunc):
arity = 1
class Reverse(GeoFunc):
arity = 1
class Scale(SQLiteDecimalToFloatMixin, GeomOutputGeoFunc):
def __init__(self, expression, x, y, z=0.0, **extra):
expressions = [
expression,
self._handle_param(x, 'x', NUMERIC_TYPES),
self._handle_param(y, 'y', NUMERIC_TYPES),
]
if z != 0.0:
expressions.append(self._handle_param(z, 'z', NUMERIC_TYPES))
super().__init__(*expressions, **extra)
class SnapToGrid(SQLiteDecimalToFloatMixin, GeomOutputGeoFunc):
def __init__(self, expression, *args, **extra):
nargs = len(args)
expressions = [expression]
if nargs in (1, 2):
expressions.extend(
[self._handle_param(arg, '', NUMERIC_TYPES) for arg in args]
)
elif nargs == 4:
# Reverse origin and size param ordering
expressions += [
*(self._handle_param(arg, '', NUMERIC_TYPES) for arg in args[2:]),
*(self._handle_param(arg, '', NUMERIC_TYPES) for arg in args[0:2]),
]
else:
raise ValueError('Must provide 1, 2, or 4 arguments to `SnapToGrid`.')
super().__init__(*expressions, **extra)
class SymDifference(OracleToleranceMixin, GeomOutputGeoFunc):
arity = 2
geom_param_pos = (0, 1)
class Transform(GeomOutputGeoFunc):
def __init__(self, expression, srid, **extra):
expressions = [
expression,
self._handle_param(srid, 'srid', int),
]
if 'output_field' not in extra:
extra['output_field'] = GeometryField(srid=srid)
super().__init__(*expressions, **extra)
class Translate(Scale):
def as_sqlite(self, compiler, connection, **extra_context):
clone = self.copy()
if len(self.source_expressions) < 4:
# Always provide the z parameter for ST_Translate
clone.source_expressions.append(Value(0))
return super(Translate, clone).as_sqlite(compiler, connection, **extra_context)
class Union(OracleToleranceMixin, GeomOutputGeoFunc):
arity = 2
geom_param_pos = (0, 1)
|
868065c5313a32a5f97b9fdec2e12deb698802a6b9a397a8dac9c3e0b0f12e62 | from unittest import mock
from django.apps.registry import apps as global_apps
from django.db import DatabaseError, connection
from django.db.migrations.exceptions import InvalidMigrationPlan
from django.db.migrations.executor import MigrationExecutor
from django.db.migrations.graph import MigrationGraph
from django.db.migrations.recorder import MigrationRecorder
from django.test import (
SimpleTestCase, modify_settings, override_settings, skipUnlessDBFeature,
)
from .test_base import MigrationTestBase
@modify_settings(INSTALLED_APPS={'append': 'migrations2'})
class ExecutorTests(MigrationTestBase):
"""
Tests the migration executor (full end-to-end running).
Bear in mind that if these are failing you should fix the other
test failures first, as they may be propagating into here.
"""
available_apps = ["migrations", "migrations2", "django.contrib.auth", "django.contrib.contenttypes"]
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_run(self):
"""
Tests running a simple set of migrations.
"""
executor = MigrationExecutor(connection)
# Let's look at the plan first and make sure it's up to scratch
plan = executor.migration_plan([("migrations", "0002_second")])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0001_initial"], False),
(executor.loader.graph.nodes["migrations", "0002_second"], False),
],
)
# Were the tables there before?
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_book")
# Alright, let's try running it
executor.migrate([("migrations", "0002_second")])
# Are the tables there now?
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_book")
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
# Alright, let's undo what we did
plan = executor.migration_plan([("migrations", None)])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0002_second"], True),
(executor.loader.graph.nodes["migrations", "0001_initial"], True),
],
)
executor.migrate([("migrations", None)])
# Are the tables gone?
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_book")
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
def test_run_with_squashed(self):
"""
Tests running a squashed migration from zero (should ignore what it replaces)
"""
executor = MigrationExecutor(connection)
# Check our leaf node is the squashed one
leaves = [key for key in executor.loader.graph.leaf_nodes() if key[0] == "migrations"]
self.assertEqual(leaves, [("migrations", "0001_squashed_0002")])
# Check the plan
plan = executor.migration_plan([("migrations", "0001_squashed_0002")])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0001_squashed_0002"], False),
],
)
# Were the tables there before?
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_book")
# Alright, let's try running it
executor.migrate([("migrations", "0001_squashed_0002")])
# Are the tables there now?
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_book")
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
# Alright, let's undo what we did. Should also just use squashed.
plan = executor.migration_plan([("migrations", None)])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0001_squashed_0002"], True),
],
)
executor.migrate([("migrations", None)])
# Are the tables gone?
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_book")
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_non_atomic"})
def test_non_atomic_migration(self):
"""
Applying a non-atomic migration works as expected.
"""
executor = MigrationExecutor(connection)
with self.assertRaisesMessage(RuntimeError, "Abort migration"):
executor.migrate([("migrations", "0001_initial")])
self.assertTableExists("migrations_publisher")
migrations_apps = executor.loader.project_state(("migrations", "0001_initial")).apps
Publisher = migrations_apps.get_model("migrations", "Publisher")
self.assertTrue(Publisher.objects.exists())
self.assertTableNotExists("migrations_book")
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_atomic_operation"})
def test_atomic_operation_in_non_atomic_migration(self):
"""
An atomic operation is properly rolled back inside a non-atomic
migration.
"""
executor = MigrationExecutor(connection)
with self.assertRaisesMessage(RuntimeError, "Abort migration"):
executor.migrate([("migrations", "0001_initial")])
migrations_apps = executor.loader.project_state(("migrations", "0001_initial")).apps
Editor = migrations_apps.get_model("migrations", "Editor")
self.assertFalse(Editor.objects.exists())
# Record previous migration as successful.
executor.migrate([("migrations", "0001_initial")], fake=True)
# Rebuild the graph to reflect the new DB state.
executor.loader.build_graph()
# Migrating backwards is also atomic.
with self.assertRaisesMessage(RuntimeError, "Abort migration"):
executor.migrate([("migrations", None)])
self.assertFalse(Editor.objects.exists())
@override_settings(MIGRATION_MODULES={
"migrations": "migrations.test_migrations",
"migrations2": "migrations2.test_migrations_2",
})
def test_empty_plan(self):
"""
Re-planning a full migration of a fully-migrated set doesn't
perform spurious unmigrations and remigrations.
There was previously a bug where the executor just always performed the
backwards plan for applied migrations - which even for the most recent
migration in an app, might include other, dependent apps, and these
were being unmigrated.
"""
# Make the initial plan, check it
executor = MigrationExecutor(connection)
plan = executor.migration_plan([
("migrations", "0002_second"),
("migrations2", "0001_initial"),
])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0001_initial"], False),
(executor.loader.graph.nodes["migrations", "0002_second"], False),
(executor.loader.graph.nodes["migrations2", "0001_initial"], False),
],
)
# Fake-apply all migrations
executor.migrate([
("migrations", "0002_second"),
("migrations2", "0001_initial")
], fake=True)
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
# Now plan a second time and make sure it's empty
plan = executor.migration_plan([
("migrations", "0002_second"),
("migrations2", "0001_initial"),
])
self.assertEqual(plan, [])
# The resulting state should include applied migrations.
state = executor.migrate([
("migrations", "0002_second"),
("migrations2", "0001_initial"),
])
self.assertIn(('migrations', 'book'), state.models)
self.assertIn(('migrations', 'author'), state.models)
self.assertIn(('migrations2', 'otherauthor'), state.models)
# Erase all the fake records
executor.recorder.record_unapplied("migrations2", "0001_initial")
executor.recorder.record_unapplied("migrations", "0002_second")
executor.recorder.record_unapplied("migrations", "0001_initial")
@override_settings(MIGRATION_MODULES={
"migrations": "migrations.test_migrations",
"migrations2": "migrations2.test_migrations_2_no_deps",
})
def test_mixed_plan_not_supported(self):
"""
Although the MigrationExecutor interfaces allows for mixed migration
plans (combined forwards and backwards migrations) this is not
supported.
"""
# Prepare for mixed plan
executor = MigrationExecutor(connection)
plan = executor.migration_plan([("migrations", "0002_second")])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0001_initial"], False),
(executor.loader.graph.nodes["migrations", "0002_second"], False),
],
)
executor.migrate(None, plan)
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
self.assertIn(('migrations', '0001_initial'), executor.loader.applied_migrations)
self.assertIn(('migrations', '0002_second'), executor.loader.applied_migrations)
self.assertNotIn(('migrations2', '0001_initial'), executor.loader.applied_migrations)
# Generate mixed plan
plan = executor.migration_plan([
("migrations", None),
("migrations2", "0001_initial"),
])
msg = (
'Migration plans with both forwards and backwards migrations are '
'not supported. Please split your migration process into separate '
'plans of only forwards OR backwards migrations.'
)
with self.assertRaisesMessage(InvalidMigrationPlan, msg) as cm:
executor.migrate(None, plan)
self.assertEqual(
cm.exception.args[1],
[
(executor.loader.graph.nodes["migrations", "0002_second"], True),
(executor.loader.graph.nodes["migrations", "0001_initial"], True),
(executor.loader.graph.nodes["migrations2", "0001_initial"], False),
],
)
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
executor.migrate([
("migrations", None),
("migrations2", None),
])
# Are the tables gone?
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_book")
self.assertTableNotExists("migrations2_otherauthor")
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_soft_apply(self):
"""
Tests detection of initial migrations already having been applied.
"""
state = {"faked": None}
def fake_storer(phase, migration=None, fake=None):
state["faked"] = fake
executor = MigrationExecutor(connection, progress_callback=fake_storer)
# Were the tables there before?
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
# Run it normally
self.assertEqual(
executor.migration_plan([("migrations", "0001_initial")]),
[
(executor.loader.graph.nodes["migrations", "0001_initial"], False),
],
)
executor.migrate([("migrations", "0001_initial")])
# Are the tables there now?
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_tribble")
# We shouldn't have faked that one
self.assertIs(state["faked"], False)
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
# Fake-reverse that
executor.migrate([("migrations", None)], fake=True)
# Are the tables still there?
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_tribble")
# Make sure that was faked
self.assertIs(state["faked"], True)
# Finally, migrate forwards; this should fake-apply our initial migration
executor.loader.build_graph()
self.assertEqual(
executor.migration_plan([("migrations", "0001_initial")]),
[
(executor.loader.graph.nodes["migrations", "0001_initial"], False),
],
)
# Applying the migration should raise a database level error
# because we haven't given the --fake-initial option
with self.assertRaises(DatabaseError):
executor.migrate([("migrations", "0001_initial")])
# Reset the faked state
state = {"faked": None}
# Allow faking of initial CreateModel operations
executor.migrate([("migrations", "0001_initial")], fake_initial=True)
self.assertIs(state["faked"], True)
# And migrate back to clean up the database
executor.loader.build_graph()
executor.migrate([("migrations", None)])
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
@override_settings(
MIGRATION_MODULES={
"migrations": "migrations.test_migrations_custom_user",
"django.contrib.auth": "django.contrib.auth.migrations",
},
AUTH_USER_MODEL="migrations.Author",
)
def test_custom_user(self):
"""
Regression test for #22325 - references to a custom user model defined in the
same app are not resolved correctly.
"""
executor = MigrationExecutor(connection)
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
# Migrate forwards
executor.migrate([("migrations", "0001_initial")])
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_tribble")
# Make sure the soft-application detection works (#23093)
# Change table_names to not return auth_user during this as
# it wouldn't be there in a normal run, and ensure migrations.Author
# exists in the global app registry temporarily.
old_table_names = connection.introspection.table_names
connection.introspection.table_names = lambda c: [x for x in old_table_names(c) if x != "auth_user"]
migrations_apps = executor.loader.project_state(("migrations", "0001_initial")).apps
global_apps.get_app_config("migrations").models["author"] = migrations_apps.get_model("migrations", "author")
try:
migration = executor.loader.get_migration("auth", "0001_initial")
self.assertIs(executor.detect_soft_applied(None, migration)[0], True)
finally:
connection.introspection.table_names = old_table_names
del global_apps.get_app_config("migrations").models["author"]
# And migrate back to clean up the database
executor.loader.build_graph()
executor.migrate([("migrations", None)])
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
@override_settings(
MIGRATION_MODULES={
"migrations": "migrations.test_add_many_to_many_field_initial",
},
)
def test_detect_soft_applied_add_field_manytomanyfield(self):
"""
executor.detect_soft_applied() detects ManyToManyField tables from an
AddField operation. This checks the case of AddField in a migration
with other operations (0001) and the case of AddField in its own
migration (0002).
"""
tables = [
# from 0001
"migrations_project",
"migrations_task",
"migrations_project_tasks",
# from 0002
"migrations_task_projects",
]
executor = MigrationExecutor(connection)
# Create the tables for 0001 but make it look like the migration hasn't
# been applied.
executor.migrate([("migrations", "0001_initial")])
executor.migrate([("migrations", None)], fake=True)
for table in tables[:3]:
self.assertTableExists(table)
# Table detection sees 0001 is applied but not 0002.
migration = executor.loader.get_migration("migrations", "0001_initial")
self.assertIs(executor.detect_soft_applied(None, migration)[0], True)
migration = executor.loader.get_migration("migrations", "0002_initial")
self.assertIs(executor.detect_soft_applied(None, migration)[0], False)
# Create the tables for both migrations but make it look like neither
# has been applied.
executor.loader.build_graph()
executor.migrate([("migrations", "0001_initial")], fake=True)
executor.migrate([("migrations", "0002_initial")])
executor.loader.build_graph()
executor.migrate([("migrations", None)], fake=True)
# Table detection sees 0002 is applied.
migration = executor.loader.get_migration("migrations", "0002_initial")
self.assertIs(executor.detect_soft_applied(None, migration)[0], True)
# Leave the tables for 0001 except the many-to-many table. That missing
# table should cause detect_soft_applied() to return False.
with connection.schema_editor() as editor:
for table in tables[2:]:
editor.execute(editor.sql_delete_table % {"table": table})
migration = executor.loader.get_migration("migrations", "0001_initial")
self.assertIs(executor.detect_soft_applied(None, migration)[0], False)
# Cleanup by removing the remaining tables.
with connection.schema_editor() as editor:
for table in tables[:2]:
editor.execute(editor.sql_delete_table % {"table": table})
for table in tables:
self.assertTableNotExists(table)
@override_settings(
INSTALLED_APPS=[
"migrations.migrations_test_apps.lookuperror_a",
"migrations.migrations_test_apps.lookuperror_b",
"migrations.migrations_test_apps.lookuperror_c"
]
)
def test_unrelated_model_lookups_forwards(self):
"""
#24123 - All models of apps already applied which are
unrelated to the first app being applied are part of the initial model
state.
"""
try:
executor = MigrationExecutor(connection)
self.assertTableNotExists("lookuperror_a_a1")
self.assertTableNotExists("lookuperror_b_b1")
self.assertTableNotExists("lookuperror_c_c1")
executor.migrate([("lookuperror_b", "0003_b3")])
self.assertTableExists("lookuperror_b_b3")
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
# Migrate forwards -- This led to a lookup LookupErrors because
# lookuperror_b.B2 is already applied
executor.migrate([
("lookuperror_a", "0004_a4"),
("lookuperror_c", "0003_c3"),
])
self.assertTableExists("lookuperror_a_a4")
self.assertTableExists("lookuperror_c_c3")
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
finally:
# Cleanup
executor.migrate([
("lookuperror_a", None),
("lookuperror_b", None),
("lookuperror_c", None),
])
self.assertTableNotExists("lookuperror_a_a1")
self.assertTableNotExists("lookuperror_b_b1")
self.assertTableNotExists("lookuperror_c_c1")
@override_settings(
INSTALLED_APPS=[
"migrations.migrations_test_apps.lookuperror_a",
"migrations.migrations_test_apps.lookuperror_b",
"migrations.migrations_test_apps.lookuperror_c"
]
)
def test_unrelated_model_lookups_backwards(self):
"""
#24123 - All models of apps being unapplied which are
unrelated to the first app being unapplied are part of the initial
model state.
"""
try:
executor = MigrationExecutor(connection)
self.assertTableNotExists("lookuperror_a_a1")
self.assertTableNotExists("lookuperror_b_b1")
self.assertTableNotExists("lookuperror_c_c1")
executor.migrate([
("lookuperror_a", "0004_a4"),
("lookuperror_b", "0003_b3"),
("lookuperror_c", "0003_c3"),
])
self.assertTableExists("lookuperror_b_b3")
self.assertTableExists("lookuperror_a_a4")
self.assertTableExists("lookuperror_c_c3")
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
# Migrate backwards -- This led to a lookup LookupErrors because
# lookuperror_b.B2 is not in the initial state (unrelated to app c)
executor.migrate([("lookuperror_a", None)])
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
finally:
# Cleanup
executor.migrate([
("lookuperror_b", None),
("lookuperror_c", None)
])
self.assertTableNotExists("lookuperror_a_a1")
self.assertTableNotExists("lookuperror_b_b1")
self.assertTableNotExists("lookuperror_c_c1")
@override_settings(
INSTALLED_APPS=[
'migrations.migrations_test_apps.mutate_state_a',
'migrations.migrations_test_apps.mutate_state_b',
]
)
def test_unrelated_applied_migrations_mutate_state(self):
"""
#26647 - Unrelated applied migrations should be part of the final
state in both directions.
"""
executor = MigrationExecutor(connection)
executor.migrate([
('mutate_state_b', '0002_add_field'),
])
# Migrate forward.
executor.loader.build_graph()
state = executor.migrate([
('mutate_state_a', '0001_initial'),
])
self.assertIn('added', dict(state.models['mutate_state_b', 'b'].fields))
executor.loader.build_graph()
# Migrate backward.
state = executor.migrate([
('mutate_state_a', None),
])
self.assertIn('added', dict(state.models['mutate_state_b', 'b'].fields))
executor.migrate([
('mutate_state_b', None),
])
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_process_callback(self):
"""
#24129 - Tests callback process
"""
call_args_list = []
def callback(*args):
call_args_list.append(args)
executor = MigrationExecutor(connection, progress_callback=callback)
# Were the tables there before?
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
executor.migrate([
("migrations", "0001_initial"),
("migrations", "0002_second"),
])
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
executor.migrate([
("migrations", None),
("migrations", None),
])
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
migrations = executor.loader.graph.nodes
expected = [
("render_start",),
("render_success",),
("apply_start", migrations['migrations', '0001_initial'], False),
("apply_success", migrations['migrations', '0001_initial'], False),
("apply_start", migrations['migrations', '0002_second'], False),
("apply_success", migrations['migrations', '0002_second'], False),
("render_start",),
("render_success",),
("unapply_start", migrations['migrations', '0002_second'], False),
("unapply_success", migrations['migrations', '0002_second'], False),
("unapply_start", migrations['migrations', '0001_initial'], False),
("unapply_success", migrations['migrations', '0001_initial'], False),
]
self.assertEqual(call_args_list, expected)
@override_settings(
INSTALLED_APPS=[
"migrations.migrations_test_apps.alter_fk.author_app",
"migrations.migrations_test_apps.alter_fk.book_app",
]
)
def test_alter_id_type_with_fk(self):
try:
executor = MigrationExecutor(connection)
self.assertTableNotExists("author_app_author")
self.assertTableNotExists("book_app_book")
# Apply initial migrations
executor.migrate([
("author_app", "0001_initial"),
("book_app", "0001_initial"),
])
self.assertTableExists("author_app_author")
self.assertTableExists("book_app_book")
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
# Apply PK type alteration
executor.migrate([("author_app", "0002_alter_id")])
# Rebuild the graph to reflect the new DB state
executor.loader.build_graph()
finally:
# We can't simply unapply the migrations here because there is no
# implicit cast from VARCHAR to INT on the database level.
with connection.schema_editor() as editor:
editor.execute(editor.sql_delete_table % {"table": "book_app_book"})
editor.execute(editor.sql_delete_table % {"table": "author_app_author"})
self.assertTableNotExists("author_app_author")
self.assertTableNotExists("book_app_book")
executor.migrate([("author_app", None)], fake=True)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
def test_apply_all_replaced_marks_replacement_as_applied(self):
"""
Applying all replaced migrations marks replacement as applied (#24628).
"""
recorder = MigrationRecorder(connection)
# Place the database in a state where the replaced migrations are
# partially applied: 0001 is applied, 0002 is not.
recorder.record_applied("migrations", "0001_initial")
executor = MigrationExecutor(connection)
# Use fake because we don't actually have the first migration
# applied, so the second will fail. And there's no need to actually
# create/modify tables here, we're just testing the
# MigrationRecord, which works the same with or without fake.
executor.migrate([("migrations", "0002_second")], fake=True)
# Because we've now applied 0001 and 0002 both, their squashed
# replacement should be marked as applied.
self.assertIn(
("migrations", "0001_squashed_0002"),
recorder.applied_migrations(),
)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
def test_migrate_marks_replacement_applied_even_if_it_did_nothing(self):
"""
A new squash migration will be marked as applied even if all its
replaced migrations were previously already applied (#24628).
"""
recorder = MigrationRecorder(connection)
# Record all replaced migrations as applied
recorder.record_applied("migrations", "0001_initial")
recorder.record_applied("migrations", "0002_second")
executor = MigrationExecutor(connection)
executor.migrate([("migrations", "0001_squashed_0002")])
# Because 0001 and 0002 are both applied, even though this migrate run
# didn't apply anything new, their squashed replacement should be
# marked as applied.
self.assertIn(
("migrations", "0001_squashed_0002"),
recorder.applied_migrations(),
)
# When the feature is False, the operation and the record won't be
# performed in a transaction and the test will systematically pass.
@skipUnlessDBFeature('can_rollback_ddl')
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations'})
def test_migrations_applied_and_recorded_atomically(self):
"""Migrations are applied and recorded atomically."""
executor = MigrationExecutor(connection)
with mock.patch('django.db.migrations.executor.MigrationExecutor.record_migration') as record_migration:
record_migration.side_effect = RuntimeError('Recording migration failed.')
with self.assertRaisesMessage(RuntimeError, 'Recording migration failed.'):
executor.migrate([('migrations', '0001_initial')])
# The migration isn't recorded as applied since it failed.
migration_recorder = MigrationRecorder(connection)
self.assertFalse(migration_recorder.migration_qs.filter(app='migrations', name='0001_initial').exists())
self.assertTableNotExists('migrations_author')
class FakeLoader:
def __init__(self, graph, applied):
self.graph = graph
self.applied_migrations = applied
class FakeMigration:
"""Really all we need is any object with a debug-useful repr."""
def __init__(self, name):
self.name = name
def __repr__(self):
return 'M<%s>' % self.name
class ExecutorUnitTests(SimpleTestCase):
"""(More) isolated unit tests for executor methods."""
def test_minimize_rollbacks(self):
"""
Minimize unnecessary rollbacks in connected apps.
When you say "./manage.py migrate appA 0001", rather than migrating to
just after appA-0001 in the linearized migration plan (which could roll
back migrations in other apps that depend on appA 0001, but don't need
to be rolled back since we're not rolling back appA 0001), we migrate
to just before appA-0002.
"""
a1_impl = FakeMigration('a1')
a1 = ('a', '1')
a2_impl = FakeMigration('a2')
a2 = ('a', '2')
b1_impl = FakeMigration('b1')
b1 = ('b', '1')
graph = MigrationGraph()
graph.add_node(a1, a1_impl)
graph.add_node(a2, a2_impl)
graph.add_node(b1, b1_impl)
graph.add_dependency(None, b1, a1)
graph.add_dependency(None, a2, a1)
executor = MigrationExecutor(None)
executor.loader = FakeLoader(graph, {
a1: a1_impl,
b1: b1_impl,
a2: a2_impl,
})
plan = executor.migration_plan({a1})
self.assertEqual(plan, [(a2_impl, True)])
def test_minimize_rollbacks_branchy(self):
r"""
Minimize rollbacks when target has multiple in-app children.
a: 1 <---- 3 <--\
\ \- 2 <--- 4
\ \
b: \- 1 <--- 2
"""
a1_impl = FakeMigration('a1')
a1 = ('a', '1')
a2_impl = FakeMigration('a2')
a2 = ('a', '2')
a3_impl = FakeMigration('a3')
a3 = ('a', '3')
a4_impl = FakeMigration('a4')
a4 = ('a', '4')
b1_impl = FakeMigration('b1')
b1 = ('b', '1')
b2_impl = FakeMigration('b2')
b2 = ('b', '2')
graph = MigrationGraph()
graph.add_node(a1, a1_impl)
graph.add_node(a2, a2_impl)
graph.add_node(a3, a3_impl)
graph.add_node(a4, a4_impl)
graph.add_node(b1, b1_impl)
graph.add_node(b2, b2_impl)
graph.add_dependency(None, a2, a1)
graph.add_dependency(None, a3, a1)
graph.add_dependency(None, a4, a2)
graph.add_dependency(None, a4, a3)
graph.add_dependency(None, b2, b1)
graph.add_dependency(None, b1, a1)
graph.add_dependency(None, b2, a2)
executor = MigrationExecutor(None)
executor.loader = FakeLoader(graph, {
a1: a1_impl,
b1: b1_impl,
a2: a2_impl,
b2: b2_impl,
a3: a3_impl,
a4: a4_impl,
})
plan = executor.migration_plan({a1})
should_be_rolled_back = [b2_impl, a4_impl, a2_impl, a3_impl]
exp = [(m, True) for m in should_be_rolled_back]
self.assertEqual(plan, exp)
def test_backwards_nothing_to_do(self):
r"""
If the current state satisfies the given target, do nothing.
a: 1 <--- 2
b: \- 1
c: \- 1
If a1 is applied already and a2 is not, and we're asked to migrate to
a1, don't apply or unapply b1 or c1, regardless of their current state.
"""
a1_impl = FakeMigration('a1')
a1 = ('a', '1')
a2_impl = FakeMigration('a2')
a2 = ('a', '2')
b1_impl = FakeMigration('b1')
b1 = ('b', '1')
c1_impl = FakeMigration('c1')
c1 = ('c', '1')
graph = MigrationGraph()
graph.add_node(a1, a1_impl)
graph.add_node(a2, a2_impl)
graph.add_node(b1, b1_impl)
graph.add_node(c1, c1_impl)
graph.add_dependency(None, a2, a1)
graph.add_dependency(None, b1, a1)
graph.add_dependency(None, c1, a1)
executor = MigrationExecutor(None)
executor.loader = FakeLoader(graph, {
a1: a1_impl,
b1: b1_impl,
})
plan = executor.migration_plan({a1})
self.assertEqual(plan, [])
|
75a122019f71bcaa1b59949cd6069e166951fdd09fa46c9bd0ec696d1abde29b | import datetime
import importlib
import io
import os
import sys
from unittest import mock
from django.apps import apps
from django.core.management import CommandError, call_command
from django.db import (
ConnectionHandler, DatabaseError, connection, connections, models,
)
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
from django.db.backends.utils import truncate_name
from django.db.migrations.exceptions import InconsistentMigrationHistory
from django.db.migrations.recorder import MigrationRecorder
from django.test import TestCase, override_settings, skipUnlessDBFeature
from .models import UnicodeModel, UnserializableModel
from .routers import TestRouter
from .test_base import MigrationTestBase
class MigrateTests(MigrationTestBase):
"""
Tests running the migrate command.
"""
databases = {'default', 'other'}
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_migrate(self):
"""
Tests basic usage of the migrate command.
"""
# No tables are created
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableNotExists("migrations_book")
# Run the migrations to 0001 only
stdout = io.StringIO()
call_command('migrate', 'migrations', '0001', verbosity=1, stdout=stdout, no_color=True)
stdout = stdout.getvalue()
self.assertIn('Target specific migration: 0001_initial, from migrations', stdout)
self.assertIn('Applying migrations.0001_initial... OK', stdout)
# The correct tables exist
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_tribble")
self.assertTableNotExists("migrations_book")
# Run migrations all the way
call_command("migrate", verbosity=0)
# The correct tables exist
self.assertTableExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableExists("migrations_book")
# Unmigrate everything
stdout = io.StringIO()
call_command('migrate', 'migrations', 'zero', verbosity=1, stdout=stdout, no_color=True)
stdout = stdout.getvalue()
self.assertIn('Unapply all migrations: migrations', stdout)
self.assertIn('Unapplying migrations.0002_second... OK', stdout)
# Tables are gone
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableNotExists("migrations_book")
@override_settings(INSTALLED_APPS=[
'django.contrib.auth',
'django.contrib.contenttypes',
'migrations.migrations_test_apps.migrated_app',
])
def test_migrate_with_system_checks(self):
out = io.StringIO()
call_command('migrate', skip_checks=False, no_color=True, stdout=out)
self.assertIn('Apply all migrations: migrated_app', out.getvalue())
@override_settings(INSTALLED_APPS=['migrations', 'migrations.migrations_test_apps.unmigrated_app_syncdb'])
def test_app_without_migrations(self):
msg = "App 'unmigrated_app_syncdb' does not have migrations."
with self.assertRaisesMessage(CommandError, msg):
call_command('migrate', app_label='unmigrated_app_syncdb')
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations_clashing_prefix'})
def test_ambiguous_prefix(self):
msg = (
"More than one migration matches 'a' in app 'migrations'. Please "
"be more specific."
)
with self.assertRaisesMessage(CommandError, msg):
call_command('migrate', app_label='migrations', migration_name='a')
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations'})
def test_unknown_prefix(self):
msg = "Cannot find a migration matching 'nonexistent' from app 'migrations'."
with self.assertRaisesMessage(CommandError, msg):
call_command('migrate', app_label='migrations', migration_name='nonexistent')
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_initial_false"})
def test_migrate_initial_false(self):
"""
`Migration.initial = False` skips fake-initial detection.
"""
# Make sure no tables are created
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
# Run the migrations to 0001 only
call_command("migrate", "migrations", "0001", verbosity=0)
# Fake rollback
call_command("migrate", "migrations", "zero", fake=True, verbosity=0)
# Make sure fake-initial detection does not run
with self.assertRaises(DatabaseError):
call_command("migrate", "migrations", "0001", fake_initial=True, verbosity=0)
call_command("migrate", "migrations", "0001", fake=True, verbosity=0)
# Real rollback
call_command("migrate", "migrations", "zero", verbosity=0)
# Make sure it's all gone
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableNotExists("migrations_book")
@override_settings(
MIGRATION_MODULES={"migrations": "migrations.test_migrations"},
DATABASE_ROUTERS=['migrations.routers.TestRouter'],
)
def test_migrate_fake_initial(self):
"""
--fake-initial only works if all tables created in the initial
migration of an app exists. Database routers must be obeyed when doing
that check.
"""
# Make sure no tables are created
for db in self.databases:
self.assertTableNotExists("migrations_author", using=db)
self.assertTableNotExists("migrations_tribble", using=db)
# Run the migrations to 0001 only
call_command("migrate", "migrations", "0001", verbosity=0)
call_command("migrate", "migrations", "0001", verbosity=0, database="other")
# Make sure the right tables exist
self.assertTableExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
# Also check the "other" database
self.assertTableNotExists("migrations_author", using="other")
self.assertTableExists("migrations_tribble", using="other")
# Fake a roll-back
call_command("migrate", "migrations", "zero", fake=True, verbosity=0)
call_command("migrate", "migrations", "zero", fake=True, verbosity=0, database="other")
# Make sure the tables still exist
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_tribble", using="other")
# Try to run initial migration
with self.assertRaises(DatabaseError):
call_command("migrate", "migrations", "0001", verbosity=0)
# Run initial migration with an explicit --fake-initial
out = io.StringIO()
with mock.patch('django.core.management.color.supports_color', lambda *args: False):
call_command("migrate", "migrations", "0001", fake_initial=True, stdout=out, verbosity=1)
call_command("migrate", "migrations", "0001", fake_initial=True, verbosity=0, database="other")
self.assertIn(
"migrations.0001_initial... faked",
out.getvalue().lower()
)
# Run migrations all the way
call_command("migrate", verbosity=0)
call_command("migrate", verbosity=0, database="other")
# Make sure the right tables exist
self.assertTableExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableExists("migrations_book")
self.assertTableNotExists("migrations_author", using="other")
self.assertTableNotExists("migrations_tribble", using="other")
self.assertTableNotExists("migrations_book", using="other")
# Fake a roll-back
call_command("migrate", "migrations", "zero", fake=True, verbosity=0)
call_command("migrate", "migrations", "zero", fake=True, verbosity=0, database="other")
# Make sure the tables still exist
self.assertTableExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableExists("migrations_book")
# Try to run initial migration
with self.assertRaises(DatabaseError):
call_command("migrate", "migrations", verbosity=0)
# Run initial migration with an explicit --fake-initial
with self.assertRaises(DatabaseError):
# Fails because "migrations_tribble" does not exist but needs to in
# order to make --fake-initial work.
call_command("migrate", "migrations", fake_initial=True, verbosity=0)
# Fake an apply
call_command("migrate", "migrations", fake=True, verbosity=0)
call_command("migrate", "migrations", fake=True, verbosity=0, database="other")
# Unmigrate everything
call_command("migrate", "migrations", "zero", verbosity=0)
call_command("migrate", "migrations", "zero", verbosity=0, database="other")
# Make sure it's all gone
for db in self.databases:
self.assertTableNotExists("migrations_author", using=db)
self.assertTableNotExists("migrations_tribble", using=db)
self.assertTableNotExists("migrations_book", using=db)
@skipUnlessDBFeature('ignores_table_name_case')
def test_migrate_fake_initial_case_insensitive(self):
with override_settings(MIGRATION_MODULES={
'migrations': 'migrations.test_fake_initial_case_insensitive.initial',
}):
call_command('migrate', 'migrations', '0001', verbosity=0)
call_command('migrate', 'migrations', 'zero', fake=True, verbosity=0)
with override_settings(MIGRATION_MODULES={
'migrations': 'migrations.test_fake_initial_case_insensitive.fake_initial',
}):
out = io.StringIO()
call_command(
'migrate',
'migrations',
'0001',
fake_initial=True,
stdout=out,
verbosity=1,
no_color=True,
)
self.assertIn(
'migrations.0001_initial... faked',
out.getvalue().lower(),
)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_fake_split_initial"})
def test_migrate_fake_split_initial(self):
"""
Split initial migrations can be faked with --fake-initial.
"""
call_command("migrate", "migrations", "0002", verbosity=0)
call_command("migrate", "migrations", "zero", fake=True, verbosity=0)
out = io.StringIO()
with mock.patch('django.core.management.color.supports_color', lambda *args: False):
call_command("migrate", "migrations", "0002", fake_initial=True, stdout=out, verbosity=1)
value = out.getvalue().lower()
self.assertIn("migrations.0001_initial... faked", value)
self.assertIn("migrations.0002_second... faked", value)
# Fake an apply
call_command("migrate", "migrations", fake=True, verbosity=0)
# Unmigrate everything
call_command("migrate", "migrations", "zero", verbosity=0)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_conflict"})
def test_migrate_conflict_exit(self):
"""
migrate exits if it detects a conflict.
"""
with self.assertRaisesMessage(CommandError, "Conflicting migrations detected"):
call_command("migrate", "migrations")
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_showmigrations_list(self):
"""
showmigrations --list displays migrations and whether or not they're
applied.
"""
out = io.StringIO()
with mock.patch('django.core.management.color.supports_color', lambda *args: True):
call_command("showmigrations", format='list', stdout=out, verbosity=0, no_color=False)
self.assertEqual(
'\x1b[1mmigrations\n\x1b[0m'
' [ ] 0001_initial\n'
' [ ] 0002_second\n',
out.getvalue().lower()
)
call_command("migrate", "migrations", "0001", verbosity=0)
out = io.StringIO()
# Giving the explicit app_label tests for selective `show_list` in the command
call_command("showmigrations", "migrations", format='list', stdout=out, verbosity=0, no_color=True)
self.assertEqual(
'migrations\n'
' [x] 0001_initial\n'
' [ ] 0002_second\n',
out.getvalue().lower()
)
out = io.StringIO()
# Applied datetimes are displayed at verbosity 2+.
call_command('showmigrations', 'migrations', stdout=out, verbosity=2, no_color=True)
migration1 = MigrationRecorder(connection).migration_qs.get(app='migrations', name='0001_initial')
self.assertEqual(
'migrations\n'
' [x] 0001_initial (applied at %s)\n'
' [ ] 0002_second\n' % migration1.applied.strftime('%Y-%m-%d %H:%M:%S'),
out.getvalue().lower()
)
# Cleanup by unmigrating everything
call_command("migrate", "migrations", "zero", verbosity=0)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_run_before"})
def test_showmigrations_plan(self):
"""
Tests --plan output of showmigrations command
"""
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out)
self.assertEqual(
"[ ] migrations.0001_initial\n"
"[ ] migrations.0003_third\n"
"[ ] migrations.0002_second\n",
out.getvalue().lower()
)
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out, verbosity=2)
self.assertEqual(
"[ ] migrations.0001_initial\n"
"[ ] migrations.0003_third ... (migrations.0001_initial)\n"
"[ ] migrations.0002_second ... (migrations.0001_initial, migrations.0003_third)\n",
out.getvalue().lower()
)
call_command("migrate", "migrations", "0003", verbosity=0)
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out)
self.assertEqual(
"[x] migrations.0001_initial\n"
"[x] migrations.0003_third\n"
"[ ] migrations.0002_second\n",
out.getvalue().lower()
)
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out, verbosity=2)
self.assertEqual(
"[x] migrations.0001_initial\n"
"[x] migrations.0003_third ... (migrations.0001_initial)\n"
"[ ] migrations.0002_second ... (migrations.0001_initial, migrations.0003_third)\n",
out.getvalue().lower()
)
# Cleanup by unmigrating everything
call_command("migrate", "migrations", "zero", verbosity=0)
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations_plan'})
def test_migrate_plan(self):
"""Tests migrate --plan output."""
out = io.StringIO()
# Show the plan up to the third migration.
call_command('migrate', 'migrations', '0003', plan=True, stdout=out, no_color=True)
self.assertEqual(
'Planned operations:\n'
'migrations.0001_initial\n'
' Create model Salamander\n'
' Raw Python operation -> Grow salamander tail.\n'
'migrations.0002_second\n'
' Create model Book\n'
" Raw SQL operation -> ['SELECT * FROM migrations_book']\n"
'migrations.0003_third\n'
' Create model Author\n'
" Raw SQL operation -> ['SELECT * FROM migrations_author']\n",
out.getvalue()
)
try:
# Migrate to the third migration.
call_command('migrate', 'migrations', '0003', verbosity=0)
out = io.StringIO()
# Show the plan for when there is nothing to apply.
call_command('migrate', 'migrations', '0003', plan=True, stdout=out, no_color=True)
self.assertEqual(
'Planned operations:\n'
' No planned migration operations.\n',
out.getvalue()
)
out = io.StringIO()
# Show the plan for reverse migration back to 0001.
call_command('migrate', 'migrations', '0001', plan=True, stdout=out, no_color=True)
self.assertEqual(
'Planned operations:\n'
'migrations.0003_third\n'
' Undo Create model Author\n'
" Raw SQL operation -> ['SELECT * FROM migrations_book']\n"
'migrations.0002_second\n'
' Undo Create model Book\n'
" Raw SQL operation -> ['SELECT * FROM migrations_salamand…\n",
out.getvalue()
)
out = io.StringIO()
# Show the migration plan to fourth, with truncated details.
call_command('migrate', 'migrations', '0004', plan=True, stdout=out, no_color=True)
self.assertEqual(
'Planned operations:\n'
'migrations.0004_fourth\n'
' Raw SQL operation -> SELECT * FROM migrations_author WHE…\n',
out.getvalue()
)
# Show the plan when an operation is irreversible.
# Migrate to the fourth migration.
call_command('migrate', 'migrations', '0004', verbosity=0)
out = io.StringIO()
call_command('migrate', 'migrations', '0003', plan=True, stdout=out, no_color=True)
self.assertEqual(
'Planned operations:\n'
'migrations.0004_fourth\n'
' Raw SQL operation -> IRREVERSIBLE\n',
out.getvalue()
)
out = io.StringIO()
call_command('migrate', 'migrations', '0005', plan=True, stdout=out, no_color=True)
# Operation is marked as irreversible only in the revert plan.
self.assertEqual(
'Planned operations:\n'
'migrations.0005_fifth\n'
' Raw Python operation\n'
' Raw Python operation\n'
' Raw Python operation -> Feed salamander.\n',
out.getvalue()
)
call_command('migrate', 'migrations', '0005', verbosity=0)
out = io.StringIO()
call_command('migrate', 'migrations', '0004', plan=True, stdout=out, no_color=True)
self.assertEqual(
'Planned operations:\n'
'migrations.0005_fifth\n'
' Raw Python operation -> IRREVERSIBLE\n'
' Raw Python operation -> IRREVERSIBLE\n'
' Raw Python operation\n',
out.getvalue()
)
finally:
# Cleanup by unmigrating everything: fake the irreversible, then
# migrate all to zero.
call_command('migrate', 'migrations', '0003', fake=True, verbosity=0)
call_command('migrate', 'migrations', 'zero', verbosity=0)
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations_empty'})
def test_showmigrations_no_migrations(self):
out = io.StringIO()
call_command('showmigrations', stdout=out, no_color=True)
self.assertEqual('migrations\n (no migrations)\n', out.getvalue().lower())
@override_settings(INSTALLED_APPS=['migrations.migrations_test_apps.unmigrated_app'])
def test_showmigrations_unmigrated_app(self):
out = io.StringIO()
call_command('showmigrations', 'unmigrated_app', stdout=out, no_color=True)
self.assertEqual('unmigrated_app\n (no migrations)\n', out.getvalue().lower())
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_empty"})
def test_showmigrations_plan_no_migrations(self):
"""
Tests --plan output of showmigrations command without migrations
"""
out = io.StringIO()
call_command('showmigrations', format='plan', stdout=out, no_color=True)
self.assertEqual('(no migrations)\n', out.getvalue().lower())
out = io.StringIO()
call_command('showmigrations', format='plan', stdout=out, verbosity=2, no_color=True)
self.assertEqual('(no migrations)\n', out.getvalue().lower())
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed_complex"})
def test_showmigrations_plan_squashed(self):
"""
Tests --plan output of showmigrations command with squashed migrations.
"""
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out)
self.assertEqual(
"[ ] migrations.1_auto\n"
"[ ] migrations.2_auto\n"
"[ ] migrations.3_squashed_5\n"
"[ ] migrations.6_auto\n"
"[ ] migrations.7_auto\n",
out.getvalue().lower()
)
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out, verbosity=2)
self.assertEqual(
"[ ] migrations.1_auto\n"
"[ ] migrations.2_auto ... (migrations.1_auto)\n"
"[ ] migrations.3_squashed_5 ... (migrations.2_auto)\n"
"[ ] migrations.6_auto ... (migrations.3_squashed_5)\n"
"[ ] migrations.7_auto ... (migrations.6_auto)\n",
out.getvalue().lower()
)
call_command("migrate", "migrations", "3_squashed_5", verbosity=0)
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out)
self.assertEqual(
"[x] migrations.1_auto\n"
"[x] migrations.2_auto\n"
"[x] migrations.3_squashed_5\n"
"[ ] migrations.6_auto\n"
"[ ] migrations.7_auto\n",
out.getvalue().lower()
)
out = io.StringIO()
call_command("showmigrations", format='plan', stdout=out, verbosity=2)
self.assertEqual(
"[x] migrations.1_auto\n"
"[x] migrations.2_auto ... (migrations.1_auto)\n"
"[x] migrations.3_squashed_5 ... (migrations.2_auto)\n"
"[ ] migrations.6_auto ... (migrations.3_squashed_5)\n"
"[ ] migrations.7_auto ... (migrations.6_auto)\n",
out.getvalue().lower()
)
@override_settings(INSTALLED_APPS=[
'migrations.migrations_test_apps.mutate_state_b',
'migrations.migrations_test_apps.alter_fk.author_app',
'migrations.migrations_test_apps.alter_fk.book_app',
])
def test_showmigrations_plan_single_app_label(self):
"""
`showmigrations --plan app_label` output with a single app_label.
"""
# Single app with no dependencies on other apps.
out = io.StringIO()
call_command('showmigrations', 'mutate_state_b', format='plan', stdout=out)
self.assertEqual(
'[ ] mutate_state_b.0001_initial\n'
'[ ] mutate_state_b.0002_add_field\n',
out.getvalue()
)
# Single app with dependencies.
out = io.StringIO()
call_command('showmigrations', 'author_app', format='plan', stdout=out)
self.assertEqual(
'[ ] author_app.0001_initial\n'
'[ ] book_app.0001_initial\n'
'[ ] author_app.0002_alter_id\n',
out.getvalue()
)
# Some migrations already applied.
call_command('migrate', 'author_app', '0001', verbosity=0)
out = io.StringIO()
call_command('showmigrations', 'author_app', format='plan', stdout=out)
self.assertEqual(
'[X] author_app.0001_initial\n'
'[ ] book_app.0001_initial\n'
'[ ] author_app.0002_alter_id\n',
out.getvalue()
)
# Cleanup by unmigrating author_app.
call_command('migrate', 'author_app', 'zero', verbosity=0)
@override_settings(INSTALLED_APPS=[
'migrations.migrations_test_apps.mutate_state_b',
'migrations.migrations_test_apps.alter_fk.author_app',
'migrations.migrations_test_apps.alter_fk.book_app',
])
def test_showmigrations_plan_multiple_app_labels(self):
"""
`showmigrations --plan app_label` output with multiple app_labels.
"""
# Multiple apps: author_app depends on book_app; mutate_state_b doesn't
# depend on other apps.
out = io.StringIO()
call_command('showmigrations', 'mutate_state_b', 'author_app', format='plan', stdout=out)
self.assertEqual(
'[ ] author_app.0001_initial\n'
'[ ] book_app.0001_initial\n'
'[ ] author_app.0002_alter_id\n'
'[ ] mutate_state_b.0001_initial\n'
'[ ] mutate_state_b.0002_add_field\n',
out.getvalue()
)
# Multiple apps: args order shouldn't matter (the same result is
# expected as above).
out = io.StringIO()
call_command('showmigrations', 'author_app', 'mutate_state_b', format='plan', stdout=out)
self.assertEqual(
'[ ] author_app.0001_initial\n'
'[ ] book_app.0001_initial\n'
'[ ] author_app.0002_alter_id\n'
'[ ] mutate_state_b.0001_initial\n'
'[ ] mutate_state_b.0002_add_field\n',
out.getvalue()
)
@override_settings(INSTALLED_APPS=['migrations.migrations_test_apps.unmigrated_app'])
def test_showmigrations_plan_app_label_no_migrations(self):
out = io.StringIO()
call_command('showmigrations', 'unmigrated_app', format='plan', stdout=out, no_color=True)
self.assertEqual('(no migrations)\n', out.getvalue())
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_sqlmigrate_forwards(self):
"""
sqlmigrate outputs forward looking SQL.
"""
out = io.StringIO()
call_command("sqlmigrate", "migrations", "0001", stdout=out)
output = out.getvalue().lower()
index_tx_start = output.find(connection.ops.start_transaction_sql().lower())
index_op_desc_author = output.find('-- create model author')
index_create_table = output.find('create table')
index_op_desc_tribble = output.find('-- create model tribble')
index_op_desc_unique_together = output.find('-- alter unique_together')
index_tx_end = output.find(connection.ops.end_transaction_sql().lower())
if connection.features.can_rollback_ddl:
self.assertGreater(index_tx_start, -1, "Transaction start not found")
self.assertGreater(
index_tx_end, index_op_desc_unique_together,
"Transaction end not found or found before operation description (unique_together)"
)
self.assertGreater(
index_op_desc_author, index_tx_start,
"Operation description (author) not found or found before transaction start"
)
self.assertGreater(
index_create_table, index_op_desc_author,
"CREATE TABLE not found or found before operation description (author)"
)
self.assertGreater(
index_op_desc_tribble, index_create_table,
"Operation description (tribble) not found or found before CREATE TABLE (author)"
)
self.assertGreater(
index_op_desc_unique_together, index_op_desc_tribble,
"Operation description (unique_together) not found or found before operation description (tribble)"
)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_sqlmigrate_backwards(self):
"""
sqlmigrate outputs reverse looking SQL.
"""
# Cannot generate the reverse SQL unless we've applied the migration.
call_command("migrate", "migrations", verbosity=0)
out = io.StringIO()
call_command("sqlmigrate", "migrations", "0001", stdout=out, backwards=True)
output = out.getvalue().lower()
index_tx_start = output.find(connection.ops.start_transaction_sql().lower())
index_op_desc_unique_together = output.find('-- alter unique_together')
index_op_desc_tribble = output.find('-- create model tribble')
index_op_desc_author = output.find('-- create model author')
index_drop_table = output.rfind('drop table')
index_tx_end = output.find(connection.ops.end_transaction_sql().lower())
if connection.features.can_rollback_ddl:
self.assertGreater(index_tx_start, -1, "Transaction start not found")
self.assertGreater(
index_tx_end, index_op_desc_unique_together,
"Transaction end not found or found before DROP TABLE"
)
self.assertGreater(
index_op_desc_unique_together, index_tx_start,
"Operation description (unique_together) not found or found before transaction start"
)
self.assertGreater(
index_op_desc_tribble, index_op_desc_unique_together,
"Operation description (tribble) not found or found before operation description (unique_together)"
)
self.assertGreater(
index_op_desc_author, index_op_desc_tribble,
"Operation description (author) not found or found before operation description (tribble)"
)
self.assertGreater(
index_drop_table, index_op_desc_author,
"DROP TABLE not found or found before operation description (author)"
)
# Cleanup by unmigrating everything
call_command("migrate", "migrations", "zero", verbosity=0)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_non_atomic"})
def test_sqlmigrate_for_non_atomic_migration(self):
"""
Transaction wrappers aren't shown for non-atomic migrations.
"""
out = io.StringIO()
call_command("sqlmigrate", "migrations", "0001", stdout=out)
output = out.getvalue().lower()
queries = [q.strip() for q in output.splitlines()]
if connection.ops.start_transaction_sql():
self.assertNotIn(connection.ops.start_transaction_sql().lower(), queries)
self.assertNotIn(connection.ops.end_transaction_sql().lower(), queries)
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations'})
def test_sqlmigrate_for_non_transactional_databases(self):
"""
Transaction wrappers aren't shown for databases that don't support
transactional DDL.
"""
out = io.StringIO()
with mock.patch.object(connection.features, 'can_rollback_ddl', False):
call_command('sqlmigrate', 'migrations', '0001', stdout=out)
output = out.getvalue().lower()
queries = [q.strip() for q in output.splitlines()]
start_transaction_sql = connection.ops.start_transaction_sql()
if start_transaction_sql:
self.assertNotIn(start_transaction_sql.lower(), queries)
self.assertNotIn(connection.ops.end_transaction_sql().lower(), queries)
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations_no_operations'})
def test_migrations_no_operations(self):
err = io.StringIO()
call_command('sqlmigrate', 'migrations', '0001_initial', stderr=err)
self.assertEqual(err.getvalue(), 'No operations found.\n')
@override_settings(
INSTALLED_APPS=[
"migrations.migrations_test_apps.migrated_app",
"migrations.migrations_test_apps.migrated_unapplied_app",
"migrations.migrations_test_apps.unmigrated_app",
],
)
def test_regression_22823_unmigrated_fk_to_migrated_model(self):
"""
Assuming you have 3 apps, `A`, `B`, and `C`, such that:
* `A` has migrations
* `B` has a migration we want to apply
* `C` has no migrations, but has an FK to `A`
When we try to migrate "B", an exception occurs because the
"B" was not included in the ProjectState that is used to detect
soft-applied migrations (#22823).
"""
call_command("migrate", "migrated_unapplied_app", stdout=io.StringIO())
# unmigrated_app.SillyModel has a foreign key to 'migrations.Tribble',
# but that model is only defined in a migration, so the global app
# registry never sees it and the reference is left dangling. Remove it
# to avoid problems in subsequent tests.
del apps._pending_operations[('migrations', 'tribble')]
@override_settings(INSTALLED_APPS=['migrations.migrations_test_apps.unmigrated_app_syncdb'])
def test_migrate_syncdb_deferred_sql_executed_with_schemaeditor(self):
"""
For an app without migrations, editor.execute() is used for executing
the syncdb deferred SQL.
"""
stdout = io.StringIO()
with mock.patch.object(BaseDatabaseSchemaEditor, 'execute') as execute:
call_command('migrate', run_syncdb=True, verbosity=1, stdout=stdout, no_color=True)
create_table_count = len([call for call in execute.mock_calls if 'CREATE TABLE' in str(call)])
self.assertEqual(create_table_count, 2)
# There's at least one deferred SQL for creating the foreign key
# index.
self.assertGreater(len(execute.mock_calls), 2)
stdout = stdout.getvalue()
self.assertIn('Synchronize unmigrated apps: unmigrated_app_syncdb', stdout)
self.assertIn('Creating tables...', stdout)
table_name = truncate_name('unmigrated_app_syncdb_classroom', connection.ops.max_name_length())
self.assertIn('Creating table %s' % table_name, stdout)
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations'})
def test_migrate_syncdb_app_with_migrations(self):
msg = "Can't use run_syncdb with app 'migrations' as it has migrations."
with self.assertRaisesMessage(CommandError, msg):
call_command('migrate', 'migrations', run_syncdb=True, verbosity=0)
@override_settings(INSTALLED_APPS=[
'migrations.migrations_test_apps.unmigrated_app_syncdb',
'migrations.migrations_test_apps.unmigrated_app_simple',
])
def test_migrate_syncdb_app_label(self):
"""
Running migrate --run-syncdb with an app_label only creates tables for
the specified app.
"""
stdout = io.StringIO()
with mock.patch.object(BaseDatabaseSchemaEditor, 'execute') as execute:
call_command('migrate', 'unmigrated_app_syncdb', run_syncdb=True, stdout=stdout)
create_table_count = len([call for call in execute.mock_calls if 'CREATE TABLE' in str(call)])
self.assertEqual(create_table_count, 2)
self.assertGreater(len(execute.mock_calls), 2)
self.assertIn('Synchronize unmigrated app: unmigrated_app_syncdb', stdout.getvalue())
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
def test_migrate_record_replaced(self):
"""
Running a single squashed migration should record all of the original
replaced migrations as run.
"""
recorder = MigrationRecorder(connection)
out = io.StringIO()
call_command("migrate", "migrations", verbosity=0)
call_command("showmigrations", "migrations", stdout=out, no_color=True)
self.assertEqual(
'migrations\n'
' [x] 0001_squashed_0002 (2 squashed migrations)\n',
out.getvalue().lower()
)
applied_migrations = recorder.applied_migrations()
self.assertIn(("migrations", "0001_initial"), applied_migrations)
self.assertIn(("migrations", "0002_second"), applied_migrations)
self.assertIn(("migrations", "0001_squashed_0002"), applied_migrations)
# Rollback changes
call_command("migrate", "migrations", "zero", verbosity=0)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
def test_migrate_record_squashed(self):
"""
Running migrate for a squashed migration should record as run
if all of the replaced migrations have been run (#25231).
"""
recorder = MigrationRecorder(connection)
recorder.record_applied("migrations", "0001_initial")
recorder.record_applied("migrations", "0002_second")
out = io.StringIO()
call_command("migrate", "migrations", verbosity=0)
call_command("showmigrations", "migrations", stdout=out, no_color=True)
self.assertEqual(
'migrations\n'
' [x] 0001_squashed_0002 (2 squashed migrations)\n',
out.getvalue().lower()
)
self.assertIn(
("migrations", "0001_squashed_0002"),
recorder.applied_migrations()
)
# No changes were actually applied so there is nothing to rollback
@override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations'})
def test_migrate_inconsistent_history(self):
"""
Running migrate with some migrations applied before their dependencies
should not be allowed.
"""
recorder = MigrationRecorder(connection)
recorder.record_applied("migrations", "0002_second")
msg = "Migration migrations.0002_second is applied before its dependency migrations.0001_initial"
with self.assertRaisesMessage(InconsistentMigrationHistory, msg):
call_command("migrate")
applied_migrations = recorder.applied_migrations()
self.assertNotIn(("migrations", "0001_initial"), applied_migrations)
class MakeMigrationsTests(MigrationTestBase):
"""
Tests running the makemigrations command.
"""
def setUp(self):
super().setUp()
self._old_models = apps.app_configs['migrations'].models.copy()
def tearDown(self):
apps.app_configs['migrations'].models = self._old_models
apps.all_models['migrations'] = self._old_models
apps.clear_cache()
super().tearDown()
def test_files_content(self):
self.assertTableNotExists("migrations_unicodemodel")
apps.register_model('migrations', UnicodeModel)
with self.temporary_migration_module() as migration_dir:
call_command("makemigrations", "migrations", verbosity=0)
# Check for empty __init__.py file in migrations folder
init_file = os.path.join(migration_dir, "__init__.py")
self.assertTrue(os.path.exists(init_file))
with open(init_file) as fp:
content = fp.read()
self.assertEqual(content, '')
# Check for existing 0001_initial.py file in migration folder
initial_file = os.path.join(migration_dir, "0001_initial.py")
self.assertTrue(os.path.exists(initial_file))
with open(initial_file, encoding='utf-8') as fp:
content = fp.read()
self.assertIn('migrations.CreateModel', content)
self.assertIn('initial = True', content)
self.assertIn('úñí©óðé µóðéø', content) # Meta.verbose_name
self.assertIn('úñí©óðé µóðéøß', content) # Meta.verbose_name_plural
self.assertIn('ÚÑÍ¢ÓÐÉ', content) # title.verbose_name
self.assertIn('“Ðjáñgó”', content) # title.default
def test_makemigrations_order(self):
"""
makemigrations should recognize number-only migrations (0001.py).
"""
module = 'migrations.test_migrations_order'
with self.temporary_migration_module(module=module) as migration_dir:
if hasattr(importlib, 'invalidate_caches'):
# importlib caches os.listdir() on some platforms like macOS
# (#23850).
importlib.invalidate_caches()
call_command('makemigrations', 'migrations', '--empty', '-n', 'a', '-v', '0')
self.assertTrue(os.path.exists(os.path.join(migration_dir, '0002_a.py')))
def test_makemigrations_empty_connections(self):
empty_connections = ConnectionHandler({'default': {}})
with mock.patch('django.core.management.commands.makemigrations.connections', new=empty_connections):
# with no apps
out = io.StringIO()
call_command('makemigrations', stdout=out)
self.assertIn('No changes detected', out.getvalue())
# with an app
with self.temporary_migration_module() as migration_dir:
call_command('makemigrations', 'migrations', verbosity=0)
init_file = os.path.join(migration_dir, '__init__.py')
self.assertTrue(os.path.exists(init_file))
@override_settings(INSTALLED_APPS=['migrations', 'migrations2'])
def test_makemigrations_consistency_checks_respect_routers(self):
"""
The history consistency checks in makemigrations respect
settings.DATABASE_ROUTERS.
"""
def patched_has_table(migration_recorder):
if migration_recorder.connection is connections['other']:
raise Exception('Other connection')
else:
return mock.DEFAULT
self.assertTableNotExists('migrations_unicodemodel')
apps.register_model('migrations', UnicodeModel)
with mock.patch.object(
MigrationRecorder, 'has_table',
autospec=True, side_effect=patched_has_table) as has_table:
with self.temporary_migration_module() as migration_dir:
call_command("makemigrations", "migrations", verbosity=0)
initial_file = os.path.join(migration_dir, "0001_initial.py")
self.assertTrue(os.path.exists(initial_file))
self.assertEqual(has_table.call_count, 1) # 'default' is checked
# Router says not to migrate 'other' so consistency shouldn't
# be checked.
with self.settings(DATABASE_ROUTERS=['migrations.routers.TestRouter']):
call_command('makemigrations', 'migrations', verbosity=0)
self.assertEqual(has_table.call_count, 2) # 'default' again
# With a router that doesn't prohibit migrating 'other',
# consistency is checked.
with self.settings(DATABASE_ROUTERS=['migrations.routers.DefaultOtherRouter']):
with self.assertRaisesMessage(Exception, 'Other connection'):
call_command('makemigrations', 'migrations', verbosity=0)
self.assertEqual(has_table.call_count, 4) # 'default' and 'other'
# With a router that doesn't allow migrating on any database,
# no consistency checks are made.
with self.settings(DATABASE_ROUTERS=['migrations.routers.TestRouter']):
with mock.patch.object(TestRouter, 'allow_migrate', return_value=False) as allow_migrate:
call_command('makemigrations', 'migrations', verbosity=0)
allow_migrate.assert_any_call('other', 'migrations', model_name='UnicodeModel')
# allow_migrate() is called with the correct arguments.
self.assertGreater(len(allow_migrate.mock_calls), 0)
called_aliases = set()
for mock_call in allow_migrate.mock_calls:
_, call_args, call_kwargs = mock_call
connection_alias, app_name = call_args
called_aliases.add(connection_alias)
# Raises an error if invalid app_name/model_name occurs.
apps.get_app_config(app_name).get_model(call_kwargs['model_name'])
self.assertEqual(called_aliases, set(connections))
self.assertEqual(has_table.call_count, 4)
def test_failing_migration(self):
# If a migration fails to serialize, it shouldn't generate an empty file. #21280
apps.register_model('migrations', UnserializableModel)
with self.temporary_migration_module() as migration_dir:
with self.assertRaisesMessage(ValueError, 'Cannot serialize'):
call_command("makemigrations", "migrations", verbosity=0)
initial_file = os.path.join(migration_dir, "0001_initial.py")
self.assertFalse(os.path.exists(initial_file))
def test_makemigrations_conflict_exit(self):
"""
makemigrations exits if it detects a conflict.
"""
with self.temporary_migration_module(module="migrations.test_migrations_conflict"):
with self.assertRaises(CommandError) as context:
call_command("makemigrations")
exception_message = str(context.exception)
self.assertIn(
'Conflicting migrations detected; multiple leaf nodes '
'in the migration graph:',
exception_message
)
self.assertIn('0002_second', exception_message)
self.assertIn('0002_conflicting_second', exception_message)
self.assertIn('in migrations', exception_message)
self.assertIn("To fix them run 'python manage.py makemigrations --merge'", exception_message)
def test_makemigrations_merge_no_conflict(self):
"""
makemigrations exits if in merge mode with no conflicts.
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations"):
call_command("makemigrations", merge=True, stdout=out)
self.assertIn("No conflicts detected to merge.", out.getvalue())
def test_makemigrations_empty_no_app_specified(self):
"""
makemigrations exits if no app is specified with 'empty' mode.
"""
msg = 'You must supply at least one app label when using --empty.'
with self.assertRaisesMessage(CommandError, msg):
call_command("makemigrations", empty=True)
def test_makemigrations_empty_migration(self):
"""
makemigrations properly constructs an empty migration.
"""
with self.temporary_migration_module() as migration_dir:
call_command("makemigrations", "migrations", empty=True, verbosity=0)
# Check for existing 0001_initial.py file in migration folder
initial_file = os.path.join(migration_dir, "0001_initial.py")
self.assertTrue(os.path.exists(initial_file))
with open(initial_file, encoding='utf-8') as fp:
content = fp.read()
# Remove all whitespace to check for empty dependencies and operations
content = content.replace(' ', '')
self.assertIn('dependencies=[\n]', content)
self.assertIn('operations=[\n]', content)
@override_settings(MIGRATION_MODULES={"migrations": None})
def test_makemigrations_disabled_migrations_for_app(self):
"""
makemigrations raises a nice error when migrations are disabled for an
app.
"""
msg = (
"Django can't create migrations for app 'migrations' because migrations "
"have been disabled via the MIGRATION_MODULES setting."
)
with self.assertRaisesMessage(ValueError, msg):
call_command("makemigrations", "migrations", empty=True, verbosity=0)
def test_makemigrations_no_changes_no_apps(self):
"""
makemigrations exits when there are no changes and no apps are specified.
"""
out = io.StringIO()
call_command("makemigrations", stdout=out)
self.assertIn("No changes detected", out.getvalue())
def test_makemigrations_no_changes(self):
"""
makemigrations exits when there are no changes to an app.
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_no_changes"):
call_command("makemigrations", "migrations", stdout=out)
self.assertIn("No changes detected in app 'migrations'", out.getvalue())
def test_makemigrations_no_apps_initial(self):
"""
makemigrations should detect initial is needed on empty migration
modules if no app provided.
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_empty"):
call_command("makemigrations", stdout=out)
self.assertIn("0001_initial.py", out.getvalue())
def test_makemigrations_no_init(self):
"""Migration directories without an __init__.py file are allowed."""
out = io.StringIO()
with self.temporary_migration_module(module='migrations.test_migrations_no_init'):
call_command('makemigrations', stdout=out)
self.assertIn('0001_initial.py', out.getvalue())
def test_makemigrations_migrations_announce(self):
"""
makemigrations announces the migration at the default verbosity level.
"""
out = io.StringIO()
with self.temporary_migration_module():
call_command("makemigrations", "migrations", stdout=out)
self.assertIn("Migrations for 'migrations'", out.getvalue())
def test_makemigrations_no_common_ancestor(self):
"""
makemigrations fails to merge migrations with no common ancestor.
"""
with self.assertRaises(ValueError) as context:
with self.temporary_migration_module(module="migrations.test_migrations_no_ancestor"):
call_command("makemigrations", "migrations", merge=True)
exception_message = str(context.exception)
self.assertIn("Could not find common ancestor of", exception_message)
self.assertIn("0002_second", exception_message)
self.assertIn("0002_conflicting_second", exception_message)
def test_makemigrations_interactive_reject(self):
"""
makemigrations enters and exits interactive mode properly.
"""
# Monkeypatch interactive questioner to auto reject
with mock.patch('builtins.input', mock.Mock(return_value='N')):
with self.temporary_migration_module(module="migrations.test_migrations_conflict") as migration_dir:
call_command("makemigrations", "migrations", name="merge", merge=True, interactive=True, verbosity=0)
merge_file = os.path.join(migration_dir, '0003_merge.py')
self.assertFalse(os.path.exists(merge_file))
def test_makemigrations_interactive_accept(self):
"""
makemigrations enters interactive mode and merges properly.
"""
# Monkeypatch interactive questioner to auto accept
with mock.patch('builtins.input', mock.Mock(return_value='y')):
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_conflict") as migration_dir:
call_command("makemigrations", "migrations", name="merge", merge=True, interactive=True, stdout=out)
merge_file = os.path.join(migration_dir, '0003_merge.py')
self.assertTrue(os.path.exists(merge_file))
self.assertIn("Created new merge migration", out.getvalue())
@mock.patch('django.db.migrations.utils.datetime')
def test_makemigrations_default_merge_name(self, mock_datetime):
mock_datetime.datetime.now.return_value = datetime.datetime(2016, 1, 2, 3, 4)
with mock.patch('builtins.input', mock.Mock(return_value='y')):
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_conflict") as migration_dir:
call_command("makemigrations", "migrations", merge=True, interactive=True, stdout=out)
merge_file = os.path.join(migration_dir, '0003_merge_20160102_0304.py')
self.assertTrue(os.path.exists(merge_file))
self.assertIn("Created new merge migration", out.getvalue())
def test_makemigrations_non_interactive_not_null_addition(self):
"""
Non-interactive makemigrations fails when a default is missing on a
new not-null field.
"""
class SillyModel(models.Model):
silly_field = models.BooleanField(default=False)
silly_int = models.IntegerField()
class Meta:
app_label = "migrations"
out = io.StringIO()
with self.assertRaises(SystemExit):
with self.temporary_migration_module(module="migrations.test_migrations_no_default"):
call_command("makemigrations", "migrations", interactive=False, stdout=out)
def test_makemigrations_non_interactive_not_null_alteration(self):
"""
Non-interactive makemigrations fails when a default is missing on a
field changed to not-null.
"""
class Author(models.Model):
name = models.CharField(max_length=255)
slug = models.SlugField()
age = models.IntegerField(default=0)
class Meta:
app_label = "migrations"
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations"):
call_command("makemigrations", "migrations", interactive=False, stdout=out)
self.assertIn("Alter field slug on author", out.getvalue())
def test_makemigrations_non_interactive_no_model_rename(self):
"""
makemigrations adds and removes a possible model rename in
non-interactive mode.
"""
class RenamedModel(models.Model):
silly_field = models.BooleanField(default=False)
class Meta:
app_label = "migrations"
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_no_default"):
call_command("makemigrations", "migrations", interactive=False, stdout=out)
self.assertIn("Delete model SillyModel", out.getvalue())
self.assertIn("Create model RenamedModel", out.getvalue())
def test_makemigrations_non_interactive_no_field_rename(self):
"""
makemigrations adds and removes a possible field rename in
non-interactive mode.
"""
class SillyModel(models.Model):
silly_rename = models.BooleanField(default=False)
class Meta:
app_label = "migrations"
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_no_default"):
call_command("makemigrations", "migrations", interactive=False, stdout=out)
self.assertIn("Remove field silly_field from sillymodel", out.getvalue())
self.assertIn("Add field silly_rename to sillymodel", out.getvalue())
def test_makemigrations_handle_merge(self):
"""
makemigrations properly merges the conflicting migrations with --noinput.
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_conflict") as migration_dir:
call_command("makemigrations", "migrations", name="merge", merge=True, interactive=False, stdout=out)
merge_file = os.path.join(migration_dir, '0003_merge.py')
self.assertTrue(os.path.exists(merge_file))
output = out.getvalue()
self.assertIn("Merging migrations", output)
self.assertIn("Branch 0002_second", output)
self.assertIn("Branch 0002_conflicting_second", output)
self.assertIn("Created new merge migration", output)
def test_makemigration_merge_dry_run(self):
"""
makemigrations respects --dry-run option when fixing migration
conflicts (#24427).
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_conflict") as migration_dir:
call_command(
"makemigrations", "migrations", name="merge", dry_run=True,
merge=True, interactive=False, stdout=out,
)
merge_file = os.path.join(migration_dir, '0003_merge.py')
self.assertFalse(os.path.exists(merge_file))
output = out.getvalue()
self.assertIn("Merging migrations", output)
self.assertIn("Branch 0002_second", output)
self.assertIn("Branch 0002_conflicting_second", output)
self.assertNotIn("Created new merge migration", output)
def test_makemigration_merge_dry_run_verbosity_3(self):
"""
`makemigrations --merge --dry-run` writes the merge migration file to
stdout with `verbosity == 3` (#24427).
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_conflict") as migration_dir:
call_command(
"makemigrations", "migrations", name="merge", dry_run=True,
merge=True, interactive=False, stdout=out, verbosity=3,
)
merge_file = os.path.join(migration_dir, '0003_merge.py')
self.assertFalse(os.path.exists(merge_file))
output = out.getvalue()
self.assertIn("Merging migrations", output)
self.assertIn("Branch 0002_second", output)
self.assertIn("Branch 0002_conflicting_second", output)
self.assertNotIn("Created new merge migration", output)
# Additional output caused by verbosity 3
# The complete merge migration file that would be written
self.assertIn("class Migration(migrations.Migration):", output)
self.assertIn("dependencies = [", output)
self.assertIn("('migrations', '0002_second')", output)
self.assertIn("('migrations', '0002_conflicting_second')", output)
self.assertIn("operations = [", output)
self.assertIn("]", output)
def test_makemigrations_dry_run(self):
"""
`makemigrations --dry-run` should not ask for defaults.
"""
class SillyModel(models.Model):
silly_field = models.BooleanField(default=False)
silly_date = models.DateField() # Added field without a default
class Meta:
app_label = "migrations"
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_no_default"):
call_command("makemigrations", "migrations", dry_run=True, stdout=out)
# Output the expected changes directly, without asking for defaults
self.assertIn("Add field silly_date to sillymodel", out.getvalue())
def test_makemigrations_dry_run_verbosity_3(self):
"""
Allow `makemigrations --dry-run` to output the migrations file to
stdout (with verbosity == 3).
"""
class SillyModel(models.Model):
silly_field = models.BooleanField(default=False)
silly_char = models.CharField(default="")
class Meta:
app_label = "migrations"
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_no_default"):
call_command("makemigrations", "migrations", dry_run=True, stdout=out, verbosity=3)
# Normal --dry-run output
self.assertIn("- Add field silly_char to sillymodel", out.getvalue())
# Additional output caused by verbosity 3
# The complete migrations file that would be written
self.assertIn("class Migration(migrations.Migration):", out.getvalue())
self.assertIn("dependencies = [", out.getvalue())
self.assertIn("('migrations', '0001_initial'),", out.getvalue())
self.assertIn("migrations.AddField(", out.getvalue())
self.assertIn("model_name='sillymodel',", out.getvalue())
self.assertIn("name='silly_char',", out.getvalue())
def test_makemigrations_migrations_modules_path_not_exist(self):
"""
makemigrations creates migrations when specifying a custom location
for migration files using MIGRATION_MODULES if the custom path
doesn't already exist.
"""
class SillyModel(models.Model):
silly_field = models.BooleanField(default=False)
class Meta:
app_label = "migrations"
out = io.StringIO()
migration_module = "migrations.test_migrations_path_doesnt_exist.foo.bar"
with self.temporary_migration_module(module=migration_module) as migration_dir:
call_command("makemigrations", "migrations", stdout=out)
# Migrations file is actually created in the expected path.
initial_file = os.path.join(migration_dir, "0001_initial.py")
self.assertTrue(os.path.exists(initial_file))
# Command output indicates the migration is created.
self.assertIn(" - Create model SillyModel", out.getvalue())
@override_settings(MIGRATION_MODULES={'migrations': 'some.nonexistent.path'})
def test_makemigrations_migrations_modules_nonexistent_toplevel_package(self):
msg = (
'Could not locate an appropriate location to create migrations '
'package some.nonexistent.path. Make sure the toplevel package '
'exists and can be imported.'
)
with self.assertRaisesMessage(ValueError, msg):
call_command('makemigrations', 'migrations', empty=True, verbosity=0)
def test_makemigrations_interactive_by_default(self):
"""
The user is prompted to merge by default if there are conflicts and
merge is True. Answer negative to differentiate it from behavior when
--noinput is specified.
"""
# Monkeypatch interactive questioner to auto reject
out = io.StringIO()
with mock.patch('builtins.input', mock.Mock(return_value='N')):
with self.temporary_migration_module(module="migrations.test_migrations_conflict") as migration_dir:
call_command("makemigrations", "migrations", name="merge", merge=True, stdout=out)
merge_file = os.path.join(migration_dir, '0003_merge.py')
# This will fail if interactive is False by default
self.assertFalse(os.path.exists(merge_file))
self.assertNotIn("Created new merge migration", out.getvalue())
@override_settings(
INSTALLED_APPS=[
"migrations",
"migrations.migrations_test_apps.unspecified_app_with_conflict"])
def test_makemigrations_unspecified_app_with_conflict_no_merge(self):
"""
makemigrations does not raise a CommandError when an unspecified app
has conflicting migrations.
"""
with self.temporary_migration_module(module="migrations.test_migrations_no_changes"):
call_command("makemigrations", "migrations", merge=False, verbosity=0)
@override_settings(
INSTALLED_APPS=[
"migrations.migrations_test_apps.migrated_app",
"migrations.migrations_test_apps.unspecified_app_with_conflict"])
def test_makemigrations_unspecified_app_with_conflict_merge(self):
"""
makemigrations does not create a merge for an unspecified app even if
it has conflicting migrations.
"""
# Monkeypatch interactive questioner to auto accept
with mock.patch('builtins.input', mock.Mock(return_value='y')):
out = io.StringIO()
with self.temporary_migration_module(app_label="migrated_app") as migration_dir:
call_command("makemigrations", "migrated_app", name="merge", merge=True, interactive=True, stdout=out)
merge_file = os.path.join(migration_dir, '0003_merge.py')
self.assertFalse(os.path.exists(merge_file))
self.assertIn("No conflicts detected to merge.", out.getvalue())
@override_settings(
INSTALLED_APPS=[
"migrations.migrations_test_apps.migrated_app",
"migrations.migrations_test_apps.conflicting_app_with_dependencies"])
def test_makemigrations_merge_dont_output_dependency_operations(self):
"""
makemigrations --merge does not output any operations from apps that
don't belong to a given app.
"""
# Monkeypatch interactive questioner to auto accept
with mock.patch('builtins.input', mock.Mock(return_value='N')):
out = io.StringIO()
with mock.patch('django.core.management.color.supports_color', lambda *args: False):
call_command(
"makemigrations", "conflicting_app_with_dependencies",
merge=True, interactive=True, stdout=out
)
val = out.getvalue().lower()
self.assertIn('merging conflicting_app_with_dependencies\n', val)
self.assertIn(
' branch 0002_conflicting_second\n'
' - create model something\n',
val
)
self.assertIn(
' branch 0002_second\n'
' - delete model tribble\n'
' - remove field silly_field from author\n'
' - add field rating to author\n'
' - create model book\n',
val
)
def test_makemigrations_with_custom_name(self):
"""
makemigrations --name generate a custom migration name.
"""
with self.temporary_migration_module() as migration_dir:
def cmd(migration_count, migration_name, *args):
call_command("makemigrations", "migrations", "--verbosity", "0", "--name", migration_name, *args)
migration_file = os.path.join(migration_dir, "%s_%s.py" % (migration_count, migration_name))
# Check for existing migration file in migration folder
self.assertTrue(os.path.exists(migration_file))
with open(migration_file, encoding='utf-8') as fp:
content = fp.read()
content = content.replace(" ", "")
return content
# generate an initial migration
migration_name_0001 = "my_initial_migration"
content = cmd("0001", migration_name_0001)
self.assertIn("dependencies=[\n]", content)
# importlib caches os.listdir() on some platforms like macOS
# (#23850).
if hasattr(importlib, 'invalidate_caches'):
importlib.invalidate_caches()
# generate an empty migration
migration_name_0002 = "my_custom_migration"
content = cmd("0002", migration_name_0002, "--empty")
self.assertIn("dependencies=[\n('migrations','0001_%s'),\n]" % migration_name_0001, content)
self.assertIn("operations=[\n]", content)
def test_makemigrations_with_invalid_custom_name(self):
msg = 'The migration name must be a valid Python identifier.'
with self.assertRaisesMessage(CommandError, msg):
call_command('makemigrations', 'migrations', '--name', 'invalid name', '--empty')
def test_makemigrations_check(self):
"""
makemigrations --check should exit with a non-zero status when
there are changes to an app requiring migrations.
"""
with self.temporary_migration_module():
with self.assertRaises(SystemExit):
call_command("makemigrations", "--check", "migrations", verbosity=0)
with self.temporary_migration_module(module="migrations.test_migrations_no_changes"):
call_command("makemigrations", "--check", "migrations", verbosity=0)
def test_makemigrations_migration_path_output(self):
"""
makemigrations should print the relative paths to the migrations unless
they are outside of the current tree, in which case the absolute path
should be shown.
"""
out = io.StringIO()
apps.register_model('migrations', UnicodeModel)
with self.temporary_migration_module() as migration_dir:
call_command("makemigrations", "migrations", stdout=out)
self.assertIn(os.path.join(migration_dir, '0001_initial.py'), out.getvalue())
def test_makemigrations_migration_path_output_valueerror(self):
"""
makemigrations prints the absolute path if os.path.relpath() raises a
ValueError when it's impossible to obtain a relative path, e.g. on
Windows if Django is installed on a different drive than where the
migration files are created.
"""
out = io.StringIO()
with self.temporary_migration_module() as migration_dir:
with mock.patch('os.path.relpath', side_effect=ValueError):
call_command('makemigrations', 'migrations', stdout=out)
self.assertIn(os.path.join(migration_dir, '0001_initial.py'), out.getvalue())
def test_makemigrations_inconsistent_history(self):
"""
makemigrations should raise InconsistentMigrationHistory exception if
there are some migrations applied before their dependencies.
"""
recorder = MigrationRecorder(connection)
recorder.record_applied('migrations', '0002_second')
msg = "Migration migrations.0002_second is applied before its dependency migrations.0001_initial"
with self.temporary_migration_module(module="migrations.test_migrations"):
with self.assertRaisesMessage(InconsistentMigrationHistory, msg):
call_command("makemigrations")
@mock.patch('builtins.input', return_value='1')
@mock.patch('django.db.migrations.questioner.sys.stdin', mock.MagicMock(encoding=sys.getdefaultencoding()))
def test_makemigrations_auto_now_add_interactive(self, *args):
"""
makemigrations prompts the user when adding auto_now_add to an existing
model.
"""
class Entry(models.Model):
title = models.CharField(max_length=255)
creation_date = models.DateTimeField(auto_now_add=True)
class Meta:
app_label = 'migrations'
# Monkeypatch interactive questioner to auto accept
with mock.patch('django.db.migrations.questioner.sys.stdout', new_callable=io.StringIO) as prompt_stdout:
out = io.StringIO()
with self.temporary_migration_module(module='migrations.test_auto_now_add'):
call_command('makemigrations', 'migrations', interactive=True, stdout=out)
output = out.getvalue()
prompt_output = prompt_stdout.getvalue()
self.assertIn("You can accept the default 'timezone.now' by pressing 'Enter'", prompt_output)
self.assertIn("Add field creation_date to entry", output)
class SquashMigrationsTests(MigrationTestBase):
"""
Tests running the squashmigrations command.
"""
def test_squashmigrations_squashes(self):
"""
squashmigrations squashes migrations.
"""
with self.temporary_migration_module(module="migrations.test_migrations") as migration_dir:
call_command("squashmigrations", "migrations", "0002", interactive=False, verbosity=0)
squashed_migration_file = os.path.join(migration_dir, "0001_squashed_0002_second.py")
self.assertTrue(os.path.exists(squashed_migration_file))
def test_squashmigrations_initial_attribute(self):
with self.temporary_migration_module(module="migrations.test_migrations") as migration_dir:
call_command("squashmigrations", "migrations", "0002", interactive=False, verbosity=0)
squashed_migration_file = os.path.join(migration_dir, "0001_squashed_0002_second.py")
with open(squashed_migration_file, encoding='utf-8') as fp:
content = fp.read()
self.assertIn("initial = True", content)
def test_squashmigrations_optimizes(self):
"""
squashmigrations optimizes operations.
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations"):
call_command("squashmigrations", "migrations", "0002", interactive=False, verbosity=1, stdout=out)
self.assertIn("Optimized from 8 operations to 2 operations.", out.getvalue())
def test_ticket_23799_squashmigrations_no_optimize(self):
"""
squashmigrations --no-optimize doesn't optimize operations.
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations"):
call_command("squashmigrations", "migrations", "0002",
interactive=False, verbosity=1, no_optimize=True, stdout=out)
self.assertIn("Skipping optimization", out.getvalue())
def test_squashmigrations_valid_start(self):
"""
squashmigrations accepts a starting migration.
"""
out = io.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations_no_changes") as migration_dir:
call_command("squashmigrations", "migrations", "0002", "0003",
interactive=False, verbosity=1, stdout=out)
squashed_migration_file = os.path.join(migration_dir, "0002_second_squashed_0003_third.py")
with open(squashed_migration_file, encoding='utf-8') as fp:
content = fp.read()
self.assertIn(" ('migrations', '0001_initial')", content)
self.assertNotIn("initial = True", content)
out = out.getvalue()
self.assertNotIn(" - 0001_initial", out)
self.assertIn(" - 0002_second", out)
self.assertIn(" - 0003_third", out)
def test_squashmigrations_invalid_start(self):
"""
squashmigrations doesn't accept a starting migration after the ending migration.
"""
with self.temporary_migration_module(module="migrations.test_migrations_no_changes"):
msg = (
"The migration 'migrations.0003_third' cannot be found. Maybe "
"it comes after the migration 'migrations.0002_second'"
)
with self.assertRaisesMessage(CommandError, msg):
call_command("squashmigrations", "migrations", "0003", "0002", interactive=False, verbosity=0)
def test_squashed_name_with_start_migration_name(self):
"""--squashed-name specifies the new migration's name."""
squashed_name = 'squashed_name'
with self.temporary_migration_module(module='migrations.test_migrations') as migration_dir:
call_command(
'squashmigrations', 'migrations', '0001', '0002',
squashed_name=squashed_name, interactive=False, verbosity=0,
)
squashed_migration_file = os.path.join(migration_dir, '0001_%s.py' % squashed_name)
self.assertTrue(os.path.exists(squashed_migration_file))
def test_squashed_name_without_start_migration_name(self):
"""--squashed-name also works if a start migration is omitted."""
squashed_name = 'squashed_name'
with self.temporary_migration_module(module="migrations.test_migrations") as migration_dir:
call_command(
'squashmigrations', 'migrations', '0001',
squashed_name=squashed_name, interactive=False, verbosity=0,
)
squashed_migration_file = os.path.join(migration_dir, '0001_%s.py' % squashed_name)
self.assertTrue(os.path.exists(squashed_migration_file))
class AppLabelErrorTests(TestCase):
"""
This class inherits TestCase because MigrationTestBase uses
`available_apps = ['migrations']` which means that it's the only installed
app. 'django.contrib.auth' must be in INSTALLED_APPS for some of these
tests.
"""
nonexistent_app_error = "No installed app with label 'nonexistent_app'."
did_you_mean_auth_error = (
"No installed app with label 'django.contrib.auth'. Did you mean "
"'auth'?"
)
def test_makemigrations_nonexistent_app_label(self):
err = io.StringIO()
with self.assertRaises(SystemExit):
call_command('makemigrations', 'nonexistent_app', stderr=err)
self.assertIn(self.nonexistent_app_error, err.getvalue())
def test_makemigrations_app_name_specified_as_label(self):
err = io.StringIO()
with self.assertRaises(SystemExit):
call_command('makemigrations', 'django.contrib.auth', stderr=err)
self.assertIn(self.did_you_mean_auth_error, err.getvalue())
def test_migrate_nonexistent_app_label(self):
with self.assertRaisesMessage(CommandError, self.nonexistent_app_error):
call_command('migrate', 'nonexistent_app')
def test_migrate_app_name_specified_as_label(self):
with self.assertRaisesMessage(CommandError, self.did_you_mean_auth_error):
call_command('migrate', 'django.contrib.auth')
def test_showmigrations_nonexistent_app_label(self):
err = io.StringIO()
with self.assertRaises(SystemExit):
call_command('showmigrations', 'nonexistent_app', stderr=err)
self.assertIn(self.nonexistent_app_error, err.getvalue())
def test_showmigrations_app_name_specified_as_label(self):
err = io.StringIO()
with self.assertRaises(SystemExit):
call_command('showmigrations', 'django.contrib.auth', stderr=err)
self.assertIn(self.did_you_mean_auth_error, err.getvalue())
def test_sqlmigrate_nonexistent_app_label(self):
with self.assertRaisesMessage(CommandError, self.nonexistent_app_error):
call_command('sqlmigrate', 'nonexistent_app', '0002')
def test_sqlmigrate_app_name_specified_as_label(self):
with self.assertRaisesMessage(CommandError, self.did_you_mean_auth_error):
call_command('sqlmigrate', 'django.contrib.auth', '0002')
def test_squashmigrations_nonexistent_app_label(self):
with self.assertRaisesMessage(CommandError, self.nonexistent_app_error):
call_command('squashmigrations', 'nonexistent_app', '0002')
def test_squashmigrations_app_name_specified_as_label(self):
with self.assertRaisesMessage(CommandError, self.did_you_mean_auth_error):
call_command('squashmigrations', 'django.contrib.auth', '0002')
|
5fc624a135dcd64f97befd58640a19c0e8c3239f5a09a45ae8d42b654f19411c | from django.core.exceptions import FieldDoesNotExist
from django.db import (
IntegrityError, connection, migrations, models, transaction,
)
from django.db.migrations.migration import Migration
from django.db.migrations.operations import CreateModel
from django.db.migrations.operations.fields import FieldOperation
from django.db.migrations.state import ModelState, ProjectState
from django.db.transaction import atomic
from django.test import SimpleTestCase, override_settings, skipUnlessDBFeature
from .models import FoodManager, FoodQuerySet, UnicodeModel
from .test_base import OperationTestBase
class Mixin:
pass
class OperationTests(OperationTestBase):
"""
Tests running the operations and making sure they do what they say they do.
Each test looks at their state changing, and then their database operation -
both forwards and backwards.
"""
def test_create_model(self):
"""
Tests the CreateModel operation.
Most other tests use this operation as part of setup, so check failures here first.
"""
operation = migrations.CreateModel(
"Pony",
[
("id", models.AutoField(primary_key=True)),
("pink", models.IntegerField(default=1)),
],
)
self.assertEqual(operation.describe(), "Create model Pony")
# Test the state alteration
project_state = ProjectState()
new_state = project_state.clone()
operation.state_forwards("test_crmo", new_state)
self.assertEqual(new_state.models["test_crmo", "pony"].name, "Pony")
self.assertEqual(len(new_state.models["test_crmo", "pony"].fields), 2)
# Test the database alteration
self.assertTableNotExists("test_crmo_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_crmo", editor, project_state, new_state)
self.assertTableExists("test_crmo_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_crmo", editor, new_state, project_state)
self.assertTableNotExists("test_crmo_pony")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "CreateModel")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["fields", "name"])
# And default manager not in set
operation = migrations.CreateModel("Foo", fields=[], managers=[("objects", models.Manager())])
definition = operation.deconstruct()
self.assertNotIn('managers', definition[2])
def test_create_model_with_duplicate_field_name(self):
with self.assertRaisesMessage(ValueError, 'Found duplicate value pink in CreateModel fields argument.'):
migrations.CreateModel(
"Pony",
[
("id", models.AutoField(primary_key=True)),
("pink", models.TextField()),
("pink", models.IntegerField(default=1)),
],
)
def test_create_model_with_duplicate_base(self):
message = 'Found duplicate value test_crmo.pony in CreateModel bases argument.'
with self.assertRaisesMessage(ValueError, message):
migrations.CreateModel(
"Pony",
fields=[],
bases=("test_crmo.Pony", "test_crmo.Pony",),
)
with self.assertRaisesMessage(ValueError, message):
migrations.CreateModel(
"Pony",
fields=[],
bases=("test_crmo.Pony", "test_crmo.pony",),
)
message = 'Found duplicate value migrations.unicodemodel in CreateModel bases argument.'
with self.assertRaisesMessage(ValueError, message):
migrations.CreateModel(
"Pony",
fields=[],
bases=(UnicodeModel, UnicodeModel,),
)
with self.assertRaisesMessage(ValueError, message):
migrations.CreateModel(
"Pony",
fields=[],
bases=(UnicodeModel, 'migrations.unicodemodel',),
)
with self.assertRaisesMessage(ValueError, message):
migrations.CreateModel(
"Pony",
fields=[],
bases=(UnicodeModel, 'migrations.UnicodeModel',),
)
message = "Found duplicate value <class 'django.db.models.base.Model'> in CreateModel bases argument."
with self.assertRaisesMessage(ValueError, message):
migrations.CreateModel(
"Pony",
fields=[],
bases=(models.Model, models.Model,),
)
message = "Found duplicate value <class 'migrations.test_operations.Mixin'> in CreateModel bases argument."
with self.assertRaisesMessage(ValueError, message):
migrations.CreateModel(
"Pony",
fields=[],
bases=(Mixin, Mixin,),
)
def test_create_model_with_duplicate_manager_name(self):
with self.assertRaisesMessage(ValueError, 'Found duplicate value objects in CreateModel managers argument.'):
migrations.CreateModel(
"Pony",
fields=[],
managers=[
("objects", models.Manager()),
("objects", models.Manager()),
],
)
def test_create_model_with_unique_after(self):
"""
Tests the CreateModel operation directly followed by an
AlterUniqueTogether (bug #22844 - sqlite remake issues)
"""
operation1 = migrations.CreateModel(
"Pony",
[
("id", models.AutoField(primary_key=True)),
("pink", models.IntegerField(default=1)),
],
)
operation2 = migrations.CreateModel(
"Rider",
[
("id", models.AutoField(primary_key=True)),
("number", models.IntegerField(default=1)),
("pony", models.ForeignKey("test_crmoua.Pony", models.CASCADE)),
],
)
operation3 = migrations.AlterUniqueTogether(
"Rider",
[
("number", "pony"),
],
)
# Test the database alteration
project_state = ProjectState()
self.assertTableNotExists("test_crmoua_pony")
self.assertTableNotExists("test_crmoua_rider")
with connection.schema_editor() as editor:
new_state = project_state.clone()
operation1.state_forwards("test_crmoua", new_state)
operation1.database_forwards("test_crmoua", editor, project_state, new_state)
project_state, new_state = new_state, new_state.clone()
operation2.state_forwards("test_crmoua", new_state)
operation2.database_forwards("test_crmoua", editor, project_state, new_state)
project_state, new_state = new_state, new_state.clone()
operation3.state_forwards("test_crmoua", new_state)
operation3.database_forwards("test_crmoua", editor, project_state, new_state)
self.assertTableExists("test_crmoua_pony")
self.assertTableExists("test_crmoua_rider")
def test_create_model_m2m(self):
"""
Test the creation of a model with a ManyToMany field and the
auto-created "through" model.
"""
project_state = self.set_up_test_model("test_crmomm")
operation = migrations.CreateModel(
"Stable",
[
("id", models.AutoField(primary_key=True)),
("ponies", models.ManyToManyField("Pony", related_name="stables"))
]
)
# Test the state alteration
new_state = project_state.clone()
operation.state_forwards("test_crmomm", new_state)
# Test the database alteration
self.assertTableNotExists("test_crmomm_stable_ponies")
with connection.schema_editor() as editor:
operation.database_forwards("test_crmomm", editor, project_state, new_state)
self.assertTableExists("test_crmomm_stable")
self.assertTableExists("test_crmomm_stable_ponies")
self.assertColumnNotExists("test_crmomm_stable", "ponies")
# Make sure the M2M field actually works
with atomic():
Pony = new_state.apps.get_model("test_crmomm", "Pony")
Stable = new_state.apps.get_model("test_crmomm", "Stable")
stable = Stable.objects.create()
p1 = Pony.objects.create(pink=False, weight=4.55)
p2 = Pony.objects.create(pink=True, weight=5.43)
stable.ponies.add(p1, p2)
self.assertEqual(stable.ponies.count(), 2)
stable.ponies.all().delete()
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_crmomm", editor, new_state, project_state)
self.assertTableNotExists("test_crmomm_stable")
self.assertTableNotExists("test_crmomm_stable_ponies")
def test_create_model_inheritance(self):
"""
Tests the CreateModel operation on a multi-table inheritance setup.
"""
project_state = self.set_up_test_model("test_crmoih")
# Test the state alteration
operation = migrations.CreateModel(
"ShetlandPony",
[
('pony_ptr', models.OneToOneField(
'test_crmoih.Pony',
models.CASCADE,
auto_created=True,
primary_key=True,
to_field='id',
serialize=False,
)),
("cuteness", models.IntegerField(default=1)),
],
)
new_state = project_state.clone()
operation.state_forwards("test_crmoih", new_state)
self.assertIn(("test_crmoih", "shetlandpony"), new_state.models)
# Test the database alteration
self.assertTableNotExists("test_crmoih_shetlandpony")
with connection.schema_editor() as editor:
operation.database_forwards("test_crmoih", editor, project_state, new_state)
self.assertTableExists("test_crmoih_shetlandpony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_crmoih", editor, new_state, project_state)
self.assertTableNotExists("test_crmoih_shetlandpony")
def test_create_proxy_model(self):
"""
CreateModel ignores proxy models.
"""
project_state = self.set_up_test_model("test_crprmo")
# Test the state alteration
operation = migrations.CreateModel(
"ProxyPony",
[],
options={"proxy": True},
bases=("test_crprmo.Pony",),
)
self.assertEqual(operation.describe(), "Create proxy model ProxyPony")
new_state = project_state.clone()
operation.state_forwards("test_crprmo", new_state)
self.assertIn(("test_crprmo", "proxypony"), new_state.models)
# Test the database alteration
self.assertTableNotExists("test_crprmo_proxypony")
self.assertTableExists("test_crprmo_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_crprmo", editor, project_state, new_state)
self.assertTableNotExists("test_crprmo_proxypony")
self.assertTableExists("test_crprmo_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_crprmo", editor, new_state, project_state)
self.assertTableNotExists("test_crprmo_proxypony")
self.assertTableExists("test_crprmo_pony")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "CreateModel")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["bases", "fields", "name", "options"])
def test_create_unmanaged_model(self):
"""
CreateModel ignores unmanaged models.
"""
project_state = self.set_up_test_model("test_crummo")
# Test the state alteration
operation = migrations.CreateModel(
"UnmanagedPony",
[],
options={"proxy": True},
bases=("test_crummo.Pony",),
)
self.assertEqual(operation.describe(), "Create proxy model UnmanagedPony")
new_state = project_state.clone()
operation.state_forwards("test_crummo", new_state)
self.assertIn(("test_crummo", "unmanagedpony"), new_state.models)
# Test the database alteration
self.assertTableNotExists("test_crummo_unmanagedpony")
self.assertTableExists("test_crummo_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_crummo", editor, project_state, new_state)
self.assertTableNotExists("test_crummo_unmanagedpony")
self.assertTableExists("test_crummo_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_crummo", editor, new_state, project_state)
self.assertTableNotExists("test_crummo_unmanagedpony")
self.assertTableExists("test_crummo_pony")
@skipUnlessDBFeature('supports_table_check_constraints')
def test_create_model_with_constraint(self):
where = models.Q(pink__gt=2)
check_constraint = models.CheckConstraint(check=where, name='test_constraint_pony_pink_gt_2')
operation = migrations.CreateModel(
"Pony",
[
("id", models.AutoField(primary_key=True)),
("pink", models.IntegerField(default=3)),
],
options={'constraints': [check_constraint]},
)
# Test the state alteration
project_state = ProjectState()
new_state = project_state.clone()
operation.state_forwards("test_crmo", new_state)
self.assertEqual(len(new_state.models['test_crmo', 'pony'].options['constraints']), 1)
# Test database alteration
self.assertTableNotExists("test_crmo_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_crmo", editor, project_state, new_state)
self.assertTableExists("test_crmo_pony")
with connection.cursor() as cursor:
with self.assertRaises(IntegrityError):
cursor.execute("INSERT INTO test_crmo_pony (id, pink) VALUES (1, 1)")
# Test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_crmo", editor, new_state, project_state)
self.assertTableNotExists("test_crmo_pony")
# Test deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "CreateModel")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2]['options']['constraints'], [check_constraint])
def test_create_model_with_partial_unique_constraint(self):
partial_unique_constraint = models.UniqueConstraint(
fields=['pink'],
condition=models.Q(weight__gt=5),
name='test_constraint_pony_pink_for_weight_gt_5_uniq',
)
operation = migrations.CreateModel(
'Pony',
[
('id', models.AutoField(primary_key=True)),
('pink', models.IntegerField(default=3)),
('weight', models.FloatField()),
],
options={'constraints': [partial_unique_constraint]},
)
# Test the state alteration
project_state = ProjectState()
new_state = project_state.clone()
operation.state_forwards('test_crmo', new_state)
self.assertEqual(len(new_state.models['test_crmo', 'pony'].options['constraints']), 1)
# Test database alteration
self.assertTableNotExists('test_crmo_pony')
with connection.schema_editor() as editor:
operation.database_forwards('test_crmo', editor, project_state, new_state)
self.assertTableExists('test_crmo_pony')
# Test constraint works
Pony = new_state.apps.get_model('test_crmo', 'Pony')
Pony.objects.create(pink=1, weight=4.0)
Pony.objects.create(pink=1, weight=4.0)
Pony.objects.create(pink=1, weight=6.0)
if connection.features.supports_partial_indexes:
with self.assertRaises(IntegrityError):
Pony.objects.create(pink=1, weight=7.0)
else:
Pony.objects.create(pink=1, weight=7.0)
# Test reversal
with connection.schema_editor() as editor:
operation.database_backwards('test_crmo', editor, new_state, project_state)
self.assertTableNotExists('test_crmo_pony')
# Test deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], 'CreateModel')
self.assertEqual(definition[1], [])
self.assertEqual(definition[2]['options']['constraints'], [partial_unique_constraint])
def test_create_model_managers(self):
"""
The managers on a model are set.
"""
project_state = self.set_up_test_model("test_cmoma")
# Test the state alteration
operation = migrations.CreateModel(
"Food",
fields=[
("id", models.AutoField(primary_key=True)),
],
managers=[
("food_qs", FoodQuerySet.as_manager()),
("food_mgr", FoodManager("a", "b")),
("food_mgr_kwargs", FoodManager("x", "y", 3, 4)),
]
)
self.assertEqual(operation.describe(), "Create model Food")
new_state = project_state.clone()
operation.state_forwards("test_cmoma", new_state)
self.assertIn(("test_cmoma", "food"), new_state.models)
managers = new_state.models["test_cmoma", "food"].managers
self.assertEqual(managers[0][0], "food_qs")
self.assertIsInstance(managers[0][1], models.Manager)
self.assertEqual(managers[1][0], "food_mgr")
self.assertIsInstance(managers[1][1], FoodManager)
self.assertEqual(managers[1][1].args, ("a", "b", 1, 2))
self.assertEqual(managers[2][0], "food_mgr_kwargs")
self.assertIsInstance(managers[2][1], FoodManager)
self.assertEqual(managers[2][1].args, ("x", "y", 3, 4))
def test_delete_model(self):
"""
Tests the DeleteModel operation.
"""
project_state = self.set_up_test_model("test_dlmo")
# Test the state alteration
operation = migrations.DeleteModel("Pony")
self.assertEqual(operation.describe(), "Delete model Pony")
new_state = project_state.clone()
operation.state_forwards("test_dlmo", new_state)
self.assertNotIn(("test_dlmo", "pony"), new_state.models)
# Test the database alteration
self.assertTableExists("test_dlmo_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_dlmo", editor, project_state, new_state)
self.assertTableNotExists("test_dlmo_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_dlmo", editor, new_state, project_state)
self.assertTableExists("test_dlmo_pony")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "DeleteModel")
self.assertEqual(definition[1], [])
self.assertEqual(list(definition[2]), ["name"])
def test_delete_proxy_model(self):
"""
Tests the DeleteModel operation ignores proxy models.
"""
project_state = self.set_up_test_model("test_dlprmo", proxy_model=True)
# Test the state alteration
operation = migrations.DeleteModel("ProxyPony")
new_state = project_state.clone()
operation.state_forwards("test_dlprmo", new_state)
self.assertIn(("test_dlprmo", "proxypony"), project_state.models)
self.assertNotIn(("test_dlprmo", "proxypony"), new_state.models)
# Test the database alteration
self.assertTableExists("test_dlprmo_pony")
self.assertTableNotExists("test_dlprmo_proxypony")
with connection.schema_editor() as editor:
operation.database_forwards("test_dlprmo", editor, project_state, new_state)
self.assertTableExists("test_dlprmo_pony")
self.assertTableNotExists("test_dlprmo_proxypony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_dlprmo", editor, new_state, project_state)
self.assertTableExists("test_dlprmo_pony")
self.assertTableNotExists("test_dlprmo_proxypony")
def test_delete_mti_model(self):
project_state = self.set_up_test_model('test_dlmtimo', mti_model=True)
# Test the state alteration
operation = migrations.DeleteModel('ShetlandPony')
new_state = project_state.clone()
operation.state_forwards('test_dlmtimo', new_state)
self.assertIn(('test_dlmtimo', 'shetlandpony'), project_state.models)
self.assertNotIn(('test_dlmtimo', 'shetlandpony'), new_state.models)
# Test the database alteration
self.assertTableExists('test_dlmtimo_pony')
self.assertTableExists('test_dlmtimo_shetlandpony')
self.assertColumnExists('test_dlmtimo_shetlandpony', 'pony_ptr_id')
with connection.schema_editor() as editor:
operation.database_forwards('test_dlmtimo', editor, project_state, new_state)
self.assertTableExists('test_dlmtimo_pony')
self.assertTableNotExists('test_dlmtimo_shetlandpony')
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards('test_dlmtimo', editor, new_state, project_state)
self.assertTableExists('test_dlmtimo_pony')
self.assertTableExists('test_dlmtimo_shetlandpony')
self.assertColumnExists('test_dlmtimo_shetlandpony', 'pony_ptr_id')
def test_rename_model(self):
"""
Tests the RenameModel operation.
"""
project_state = self.set_up_test_model("test_rnmo", related_model=True)
# Test the state alteration
operation = migrations.RenameModel("Pony", "Horse")
self.assertEqual(operation.describe(), "Rename model Pony to Horse")
# Test initial state and database
self.assertIn(("test_rnmo", "pony"), project_state.models)
self.assertNotIn(("test_rnmo", "horse"), project_state.models)
self.assertTableExists("test_rnmo_pony")
self.assertTableNotExists("test_rnmo_horse")
if connection.features.supports_foreign_keys:
self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id"))
self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id"))
# Migrate forwards
new_state = project_state.clone()
atomic_rename = connection.features.supports_atomic_references_rename
new_state = self.apply_operations("test_rnmo", new_state, [operation], atomic=atomic_rename)
# Test new state and database
self.assertNotIn(("test_rnmo", "pony"), new_state.models)
self.assertIn(("test_rnmo", "horse"), new_state.models)
# RenameModel also repoints all incoming FKs and M2Ms
self.assertEqual("test_rnmo.Horse", new_state.models["test_rnmo", "rider"].fields[1][1].remote_field.model)
self.assertTableNotExists("test_rnmo_pony")
self.assertTableExists("test_rnmo_horse")
if connection.features.supports_foreign_keys:
self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id"))
self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id"))
# Migrate backwards
original_state = self.unapply_operations("test_rnmo", project_state, [operation], atomic=atomic_rename)
# Test original state and database
self.assertIn(("test_rnmo", "pony"), original_state.models)
self.assertNotIn(("test_rnmo", "horse"), original_state.models)
self.assertEqual("Pony", original_state.models["test_rnmo", "rider"].fields[1][1].remote_field.model)
self.assertTableExists("test_rnmo_pony")
self.assertTableNotExists("test_rnmo_horse")
if connection.features.supports_foreign_keys:
self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id"))
self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id"))
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "RenameModel")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'old_name': "Pony", 'new_name': "Horse"})
def test_rename_model_state_forwards(self):
"""
RenameModel operations shouldn't trigger the caching of rendered apps
on state without prior apps.
"""
state = ProjectState()
state.add_model(ModelState('migrations', 'Foo', []))
operation = migrations.RenameModel('Foo', 'Bar')
operation.state_forwards('migrations', state)
self.assertNotIn('apps', state.__dict__)
self.assertNotIn(('migrations', 'foo'), state.models)
self.assertIn(('migrations', 'bar'), state.models)
# Now with apps cached.
apps = state.apps
operation = migrations.RenameModel('Bar', 'Foo')
operation.state_forwards('migrations', state)
self.assertIs(state.apps, apps)
self.assertNotIn(('migrations', 'bar'), state.models)
self.assertIn(('migrations', 'foo'), state.models)
def test_rename_model_with_self_referential_fk(self):
"""
Tests the RenameModel operation on model with self referential FK.
"""
project_state = self.set_up_test_model("test_rmwsrf", related_model=True)
# Test the state alteration
operation = migrations.RenameModel("Rider", "HorseRider")
self.assertEqual(operation.describe(), "Rename model Rider to HorseRider")
new_state = project_state.clone()
operation.state_forwards("test_rmwsrf", new_state)
self.assertNotIn(("test_rmwsrf", "rider"), new_state.models)
self.assertIn(("test_rmwsrf", "horserider"), new_state.models)
# Remember, RenameModel also repoints all incoming FKs and M2Ms
self.assertEqual(
'self',
new_state.models["test_rmwsrf", "horserider"].fields[2][1].remote_field.model
)
HorseRider = new_state.apps.get_model('test_rmwsrf', 'horserider')
self.assertIs(HorseRider._meta.get_field('horserider').remote_field.model, HorseRider)
# Test the database alteration
self.assertTableExists("test_rmwsrf_rider")
self.assertTableNotExists("test_rmwsrf_horserider")
if connection.features.supports_foreign_keys:
self.assertFKExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_rider", "id"))
self.assertFKNotExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_horserider", "id"))
atomic_rename = connection.features.supports_atomic_references_rename
with connection.schema_editor(atomic=atomic_rename) as editor:
operation.database_forwards("test_rmwsrf", editor, project_state, new_state)
self.assertTableNotExists("test_rmwsrf_rider")
self.assertTableExists("test_rmwsrf_horserider")
if connection.features.supports_foreign_keys:
self.assertFKNotExists("test_rmwsrf_horserider", ["friend_id"], ("test_rmwsrf_rider", "id"))
self.assertFKExists("test_rmwsrf_horserider", ["friend_id"], ("test_rmwsrf_horserider", "id"))
# And test reversal
with connection.schema_editor(atomic=atomic_rename) as editor:
operation.database_backwards("test_rmwsrf", editor, new_state, project_state)
self.assertTableExists("test_rmwsrf_rider")
self.assertTableNotExists("test_rmwsrf_horserider")
if connection.features.supports_foreign_keys:
self.assertFKExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_rider", "id"))
self.assertFKNotExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_horserider", "id"))
def test_rename_model_with_superclass_fk(self):
"""
Tests the RenameModel operation on a model which has a superclass that
has a foreign key.
"""
project_state = self.set_up_test_model("test_rmwsc", related_model=True, mti_model=True)
# Test the state alteration
operation = migrations.RenameModel("ShetlandPony", "LittleHorse")
self.assertEqual(operation.describe(), "Rename model ShetlandPony to LittleHorse")
new_state = project_state.clone()
operation.state_forwards("test_rmwsc", new_state)
self.assertNotIn(("test_rmwsc", "shetlandpony"), new_state.models)
self.assertIn(("test_rmwsc", "littlehorse"), new_state.models)
# RenameModel shouldn't repoint the superclass's relations, only local ones
self.assertEqual(
project_state.models["test_rmwsc", "rider"].fields[1][1].remote_field.model,
new_state.models["test_rmwsc", "rider"].fields[1][1].remote_field.model
)
# Before running the migration we have a table for Shetland Pony, not Little Horse
self.assertTableExists("test_rmwsc_shetlandpony")
self.assertTableNotExists("test_rmwsc_littlehorse")
if connection.features.supports_foreign_keys:
# and the foreign key on rider points to pony, not shetland pony
self.assertFKExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_pony", "id"))
self.assertFKNotExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_shetlandpony", "id"))
with connection.schema_editor(atomic=connection.features.supports_atomic_references_rename) as editor:
operation.database_forwards("test_rmwsc", editor, project_state, new_state)
# Now we have a little horse table, not shetland pony
self.assertTableNotExists("test_rmwsc_shetlandpony")
self.assertTableExists("test_rmwsc_littlehorse")
if connection.features.supports_foreign_keys:
# but the Foreign keys still point at pony, not little horse
self.assertFKExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_pony", "id"))
self.assertFKNotExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_littlehorse", "id"))
def test_rename_model_with_self_referential_m2m(self):
app_label = "test_rename_model_with_self_referential_m2m"
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel("ReflexivePony", fields=[
("id", models.AutoField(primary_key=True)),
("ponies", models.ManyToManyField("self")),
]),
])
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.RenameModel("ReflexivePony", "ReflexivePony2"),
], atomic=connection.features.supports_atomic_references_rename)
Pony = project_state.apps.get_model(app_label, "ReflexivePony2")
pony = Pony.objects.create()
pony.ponies.add(pony)
def test_rename_model_with_m2m(self):
app_label = "test_rename_model_with_m2m"
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel("Rider", fields=[
("id", models.AutoField(primary_key=True)),
]),
migrations.CreateModel("Pony", fields=[
("id", models.AutoField(primary_key=True)),
("riders", models.ManyToManyField("Rider")),
]),
])
Pony = project_state.apps.get_model(app_label, "Pony")
Rider = project_state.apps.get_model(app_label, "Rider")
pony = Pony.objects.create()
rider = Rider.objects.create()
pony.riders.add(rider)
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.RenameModel("Pony", "Pony2"),
], atomic=connection.features.supports_atomic_references_rename)
Pony = project_state.apps.get_model(app_label, "Pony2")
Rider = project_state.apps.get_model(app_label, "Rider")
pony = Pony.objects.create()
rider = Rider.objects.create()
pony.riders.add(rider)
self.assertEqual(Pony.objects.count(), 2)
self.assertEqual(Rider.objects.count(), 2)
self.assertEqual(Pony._meta.get_field('riders').remote_field.through.objects.count(), 2)
def test_rename_m2m_target_model(self):
app_label = "test_rename_m2m_target_model"
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel("Rider", fields=[
("id", models.AutoField(primary_key=True)),
]),
migrations.CreateModel("Pony", fields=[
("id", models.AutoField(primary_key=True)),
("riders", models.ManyToManyField("Rider")),
]),
])
Pony = project_state.apps.get_model(app_label, "Pony")
Rider = project_state.apps.get_model(app_label, "Rider")
pony = Pony.objects.create()
rider = Rider.objects.create()
pony.riders.add(rider)
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.RenameModel("Rider", "Rider2"),
], atomic=connection.features.supports_atomic_references_rename)
Pony = project_state.apps.get_model(app_label, "Pony")
Rider = project_state.apps.get_model(app_label, "Rider2")
pony = Pony.objects.create()
rider = Rider.objects.create()
pony.riders.add(rider)
self.assertEqual(Pony.objects.count(), 2)
self.assertEqual(Rider.objects.count(), 2)
self.assertEqual(Pony._meta.get_field('riders').remote_field.through.objects.count(), 2)
def test_rename_m2m_through_model(self):
app_label = "test_rename_through"
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel("Rider", fields=[
("id", models.AutoField(primary_key=True)),
]),
migrations.CreateModel("Pony", fields=[
("id", models.AutoField(primary_key=True)),
]),
migrations.CreateModel("PonyRider", fields=[
("id", models.AutoField(primary_key=True)),
("rider", models.ForeignKey("test_rename_through.Rider", models.CASCADE)),
("pony", models.ForeignKey("test_rename_through.Pony", models.CASCADE)),
]),
migrations.AddField(
"Pony",
"riders",
models.ManyToManyField("test_rename_through.Rider", through="test_rename_through.PonyRider"),
),
])
Pony = project_state.apps.get_model(app_label, "Pony")
Rider = project_state.apps.get_model(app_label, "Rider")
PonyRider = project_state.apps.get_model(app_label, "PonyRider")
pony = Pony.objects.create()
rider = Rider.objects.create()
PonyRider.objects.create(pony=pony, rider=rider)
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.RenameModel("PonyRider", "PonyRider2"),
])
Pony = project_state.apps.get_model(app_label, "Pony")
Rider = project_state.apps.get_model(app_label, "Rider")
PonyRider = project_state.apps.get_model(app_label, "PonyRider2")
pony = Pony.objects.first()
rider = Rider.objects.create()
PonyRider.objects.create(pony=pony, rider=rider)
self.assertEqual(Pony.objects.count(), 1)
self.assertEqual(Rider.objects.count(), 2)
self.assertEqual(PonyRider.objects.count(), 2)
self.assertEqual(pony.riders.count(), 2)
def test_rename_m2m_model_after_rename_field(self):
"""RenameModel renames a many-to-many column after a RenameField."""
app_label = 'test_rename_multiple'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Pony', fields=[
('id', models.AutoField(primary_key=True)),
('name', models.CharField(max_length=20)),
]),
migrations.CreateModel('Rider', fields=[
('id', models.AutoField(primary_key=True)),
('pony', models.ForeignKey('test_rename_multiple.Pony', models.CASCADE)),
]),
migrations.CreateModel('PonyRider', fields=[
('id', models.AutoField(primary_key=True)),
('riders', models.ManyToManyField('Rider')),
]),
migrations.RenameField(model_name='pony', old_name='name', new_name='fancy_name'),
migrations.RenameModel(old_name='Rider', new_name='Jockey'),
], atomic=connection.features.supports_atomic_references_rename)
Pony = project_state.apps.get_model(app_label, 'Pony')
Jockey = project_state.apps.get_model(app_label, 'Jockey')
PonyRider = project_state.apps.get_model(app_label, 'PonyRider')
# No "no such column" error means the column was renamed correctly.
pony = Pony.objects.create(fancy_name='a good name')
jockey = Jockey.objects.create(pony=pony)
ponyrider = PonyRider.objects.create()
ponyrider.riders.add(jockey)
def test_add_field(self):
"""
Tests the AddField operation.
"""
# Test the state alteration
operation = migrations.AddField(
"Pony",
"height",
models.FloatField(null=True, default=5),
)
self.assertEqual(operation.describe(), "Add field height to Pony")
project_state, new_state = self.make_test_state("test_adfl", operation)
self.assertEqual(len(new_state.models["test_adfl", "pony"].fields), 4)
field = [
f for n, f in new_state.models["test_adfl", "pony"].fields
if n == "height"
][0]
self.assertEqual(field.default, 5)
# Test the database alteration
self.assertColumnNotExists("test_adfl_pony", "height")
with connection.schema_editor() as editor:
operation.database_forwards("test_adfl", editor, project_state, new_state)
self.assertColumnExists("test_adfl_pony", "height")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_adfl", editor, new_state, project_state)
self.assertColumnNotExists("test_adfl_pony", "height")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AddField")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["field", "model_name", "name"])
def test_add_charfield(self):
"""
Tests the AddField operation on TextField.
"""
project_state = self.set_up_test_model("test_adchfl")
Pony = project_state.apps.get_model("test_adchfl", "Pony")
pony = Pony.objects.create(weight=42)
new_state = self.apply_operations("test_adchfl", project_state, [
migrations.AddField(
"Pony",
"text",
models.CharField(max_length=10, default="some text"),
),
migrations.AddField(
"Pony",
"empty",
models.CharField(max_length=10, default=""),
),
# If not properly quoted digits would be interpreted as an int.
migrations.AddField(
"Pony",
"digits",
models.CharField(max_length=10, default="42"),
),
# Manual quoting is fragile and could trip on quotes. Refs #xyz.
migrations.AddField(
"Pony",
"quotes",
models.CharField(max_length=10, default='"\'"'),
),
])
Pony = new_state.apps.get_model("test_adchfl", "Pony")
pony = Pony.objects.get(pk=pony.pk)
self.assertEqual(pony.text, "some text")
self.assertEqual(pony.empty, "")
self.assertEqual(pony.digits, "42")
self.assertEqual(pony.quotes, '"\'"')
def test_add_textfield(self):
"""
Tests the AddField operation on TextField.
"""
project_state = self.set_up_test_model("test_adtxtfl")
Pony = project_state.apps.get_model("test_adtxtfl", "Pony")
pony = Pony.objects.create(weight=42)
new_state = self.apply_operations("test_adtxtfl", project_state, [
migrations.AddField(
"Pony",
"text",
models.TextField(default="some text"),
),
migrations.AddField(
"Pony",
"empty",
models.TextField(default=""),
),
# If not properly quoted digits would be interpreted as an int.
migrations.AddField(
"Pony",
"digits",
models.TextField(default="42"),
),
# Manual quoting is fragile and could trip on quotes. Refs #xyz.
migrations.AddField(
"Pony",
"quotes",
models.TextField(default='"\'"'),
),
])
Pony = new_state.apps.get_model("test_adtxtfl", "Pony")
pony = Pony.objects.get(pk=pony.pk)
self.assertEqual(pony.text, "some text")
self.assertEqual(pony.empty, "")
self.assertEqual(pony.digits, "42")
self.assertEqual(pony.quotes, '"\'"')
def test_add_binaryfield(self):
"""
Tests the AddField operation on TextField/BinaryField.
"""
project_state = self.set_up_test_model("test_adbinfl")
Pony = project_state.apps.get_model("test_adbinfl", "Pony")
pony = Pony.objects.create(weight=42)
new_state = self.apply_operations("test_adbinfl", project_state, [
migrations.AddField(
"Pony",
"blob",
models.BinaryField(default=b"some text"),
),
migrations.AddField(
"Pony",
"empty",
models.BinaryField(default=b""),
),
# If not properly quoted digits would be interpreted as an int.
migrations.AddField(
"Pony",
"digits",
models.BinaryField(default=b"42"),
),
# Manual quoting is fragile and could trip on quotes. Refs #xyz.
migrations.AddField(
"Pony",
"quotes",
models.BinaryField(default=b'"\'"'),
),
])
Pony = new_state.apps.get_model("test_adbinfl", "Pony")
pony = Pony.objects.get(pk=pony.pk)
# SQLite returns buffer/memoryview, cast to bytes for checking.
self.assertEqual(bytes(pony.blob), b"some text")
self.assertEqual(bytes(pony.empty), b"")
self.assertEqual(bytes(pony.digits), b"42")
self.assertEqual(bytes(pony.quotes), b'"\'"')
def test_column_name_quoting(self):
"""
Column names that are SQL keywords shouldn't cause problems when used
in migrations (#22168).
"""
project_state = self.set_up_test_model("test_regr22168")
operation = migrations.AddField(
"Pony",
"order",
models.IntegerField(default=0),
)
new_state = project_state.clone()
operation.state_forwards("test_regr22168", new_state)
with connection.schema_editor() as editor:
operation.database_forwards("test_regr22168", editor, project_state, new_state)
self.assertColumnExists("test_regr22168_pony", "order")
def test_add_field_preserve_default(self):
"""
Tests the AddField operation's state alteration
when preserve_default = False.
"""
project_state = self.set_up_test_model("test_adflpd")
# Test the state alteration
operation = migrations.AddField(
"Pony",
"height",
models.FloatField(null=True, default=4),
preserve_default=False,
)
new_state = project_state.clone()
operation.state_forwards("test_adflpd", new_state)
self.assertEqual(len(new_state.models["test_adflpd", "pony"].fields), 4)
field = [
f for n, f in new_state.models["test_adflpd", "pony"].fields
if n == "height"
][0]
self.assertEqual(field.default, models.NOT_PROVIDED)
# Test the database alteration
project_state.apps.get_model("test_adflpd", "pony").objects.create(
weight=4,
)
self.assertColumnNotExists("test_adflpd_pony", "height")
with connection.schema_editor() as editor:
operation.database_forwards("test_adflpd", editor, project_state, new_state)
self.assertColumnExists("test_adflpd_pony", "height")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AddField")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["field", "model_name", "name", "preserve_default"])
def test_add_field_m2m(self):
"""
Tests the AddField operation with a ManyToManyField.
"""
project_state = self.set_up_test_model("test_adflmm", second_model=True)
# Test the state alteration
operation = migrations.AddField("Pony", "stables", models.ManyToManyField("Stable", related_name="ponies"))
new_state = project_state.clone()
operation.state_forwards("test_adflmm", new_state)
self.assertEqual(len(new_state.models["test_adflmm", "pony"].fields), 4)
# Test the database alteration
self.assertTableNotExists("test_adflmm_pony_stables")
with connection.schema_editor() as editor:
operation.database_forwards("test_adflmm", editor, project_state, new_state)
self.assertTableExists("test_adflmm_pony_stables")
self.assertColumnNotExists("test_adflmm_pony", "stables")
# Make sure the M2M field actually works
with atomic():
Pony = new_state.apps.get_model("test_adflmm", "Pony")
p = Pony.objects.create(pink=False, weight=4.55)
p.stables.create()
self.assertEqual(p.stables.count(), 1)
p.stables.all().delete()
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_adflmm", editor, new_state, project_state)
self.assertTableNotExists("test_adflmm_pony_stables")
def test_alter_field_m2m(self):
project_state = self.set_up_test_model("test_alflmm", second_model=True)
project_state = self.apply_operations("test_alflmm", project_state, operations=[
migrations.AddField("Pony", "stables", models.ManyToManyField("Stable", related_name="ponies"))
])
Pony = project_state.apps.get_model("test_alflmm", "Pony")
self.assertFalse(Pony._meta.get_field('stables').blank)
project_state = self.apply_operations("test_alflmm", project_state, operations=[
migrations.AlterField(
"Pony", "stables", models.ManyToManyField(to="Stable", related_name="ponies", blank=True)
)
])
Pony = project_state.apps.get_model("test_alflmm", "Pony")
self.assertTrue(Pony._meta.get_field('stables').blank)
def test_repoint_field_m2m(self):
project_state = self.set_up_test_model("test_alflmm", second_model=True, third_model=True)
project_state = self.apply_operations("test_alflmm", project_state, operations=[
migrations.AddField("Pony", "places", models.ManyToManyField("Stable", related_name="ponies"))
])
Pony = project_state.apps.get_model("test_alflmm", "Pony")
project_state = self.apply_operations("test_alflmm", project_state, operations=[
migrations.AlterField("Pony", "places", models.ManyToManyField(to="Van", related_name="ponies"))
])
# Ensure the new field actually works
Pony = project_state.apps.get_model("test_alflmm", "Pony")
p = Pony.objects.create(pink=False, weight=4.55)
p.places.create()
self.assertEqual(p.places.count(), 1)
p.places.all().delete()
def test_remove_field_m2m(self):
project_state = self.set_up_test_model("test_rmflmm", second_model=True)
project_state = self.apply_operations("test_rmflmm", project_state, operations=[
migrations.AddField("Pony", "stables", models.ManyToManyField("Stable", related_name="ponies"))
])
self.assertTableExists("test_rmflmm_pony_stables")
with_field_state = project_state.clone()
operations = [migrations.RemoveField("Pony", "stables")]
project_state = self.apply_operations("test_rmflmm", project_state, operations=operations)
self.assertTableNotExists("test_rmflmm_pony_stables")
# And test reversal
self.unapply_operations("test_rmflmm", with_field_state, operations=operations)
self.assertTableExists("test_rmflmm_pony_stables")
def test_remove_field_m2m_with_through(self):
project_state = self.set_up_test_model("test_rmflmmwt", second_model=True)
self.assertTableNotExists("test_rmflmmwt_ponystables")
project_state = self.apply_operations("test_rmflmmwt", project_state, operations=[
migrations.CreateModel("PonyStables", fields=[
("pony", models.ForeignKey('test_rmflmmwt.Pony', models.CASCADE)),
("stable", models.ForeignKey('test_rmflmmwt.Stable', models.CASCADE)),
]),
migrations.AddField(
"Pony", "stables",
models.ManyToManyField("Stable", related_name="ponies", through='test_rmflmmwt.PonyStables')
)
])
self.assertTableExists("test_rmflmmwt_ponystables")
operations = [migrations.RemoveField("Pony", "stables"), migrations.DeleteModel("PonyStables")]
self.apply_operations("test_rmflmmwt", project_state, operations=operations)
def test_remove_field(self):
"""
Tests the RemoveField operation.
"""
project_state = self.set_up_test_model("test_rmfl")
# Test the state alteration
operation = migrations.RemoveField("Pony", "pink")
self.assertEqual(operation.describe(), "Remove field pink from Pony")
new_state = project_state.clone()
operation.state_forwards("test_rmfl", new_state)
self.assertEqual(len(new_state.models["test_rmfl", "pony"].fields), 2)
# Test the database alteration
self.assertColumnExists("test_rmfl_pony", "pink")
with connection.schema_editor() as editor:
operation.database_forwards("test_rmfl", editor, project_state, new_state)
self.assertColumnNotExists("test_rmfl_pony", "pink")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_rmfl", editor, new_state, project_state)
self.assertColumnExists("test_rmfl_pony", "pink")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "RemoveField")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'model_name': "Pony", 'name': 'pink'})
def test_remove_fk(self):
"""
Tests the RemoveField operation on a foreign key.
"""
project_state = self.set_up_test_model("test_rfk", related_model=True)
self.assertColumnExists("test_rfk_rider", "pony_id")
operation = migrations.RemoveField("Rider", "pony")
new_state = project_state.clone()
operation.state_forwards("test_rfk", new_state)
with connection.schema_editor() as editor:
operation.database_forwards("test_rfk", editor, project_state, new_state)
self.assertColumnNotExists("test_rfk_rider", "pony_id")
with connection.schema_editor() as editor:
operation.database_backwards("test_rfk", editor, new_state, project_state)
self.assertColumnExists("test_rfk_rider", "pony_id")
def test_alter_model_table(self):
"""
Tests the AlterModelTable operation.
"""
project_state = self.set_up_test_model("test_almota")
# Test the state alteration
operation = migrations.AlterModelTable("Pony", "test_almota_pony_2")
self.assertEqual(operation.describe(), "Rename table for Pony to test_almota_pony_2")
new_state = project_state.clone()
operation.state_forwards("test_almota", new_state)
self.assertEqual(new_state.models["test_almota", "pony"].options["db_table"], "test_almota_pony_2")
# Test the database alteration
self.assertTableExists("test_almota_pony")
self.assertTableNotExists("test_almota_pony_2")
with connection.schema_editor() as editor:
operation.database_forwards("test_almota", editor, project_state, new_state)
self.assertTableNotExists("test_almota_pony")
self.assertTableExists("test_almota_pony_2")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_almota", editor, new_state, project_state)
self.assertTableExists("test_almota_pony")
self.assertTableNotExists("test_almota_pony_2")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AlterModelTable")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'name': "Pony", 'table': "test_almota_pony_2"})
def test_alter_model_table_none(self):
"""
Tests the AlterModelTable operation if the table name is set to None.
"""
operation = migrations.AlterModelTable("Pony", None)
self.assertEqual(operation.describe(), "Rename table for Pony to (default)")
def test_alter_model_table_noop(self):
"""
Tests the AlterModelTable operation if the table name is not changed.
"""
project_state = self.set_up_test_model("test_almota")
# Test the state alteration
operation = migrations.AlterModelTable("Pony", "test_almota_pony")
new_state = project_state.clone()
operation.state_forwards("test_almota", new_state)
self.assertEqual(new_state.models["test_almota", "pony"].options["db_table"], "test_almota_pony")
# Test the database alteration
self.assertTableExists("test_almota_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_almota", editor, project_state, new_state)
self.assertTableExists("test_almota_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_almota", editor, new_state, project_state)
self.assertTableExists("test_almota_pony")
def test_alter_model_table_m2m(self):
"""
AlterModelTable should rename auto-generated M2M tables.
"""
app_label = "test_talflmltlm2m"
pony_db_table = 'pony_foo'
project_state = self.set_up_test_model(app_label, second_model=True, db_table=pony_db_table)
# Add the M2M field
first_state = project_state.clone()
operation = migrations.AddField("Pony", "stables", models.ManyToManyField("Stable"))
operation.state_forwards(app_label, first_state)
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, project_state, first_state)
original_m2m_table = "%s_%s" % (pony_db_table, "stables")
new_m2m_table = "%s_%s" % (app_label, "pony_stables")
self.assertTableExists(original_m2m_table)
self.assertTableNotExists(new_m2m_table)
# Rename the Pony db_table which should also rename the m2m table.
second_state = first_state.clone()
operation = migrations.AlterModelTable(name='pony', table=None)
operation.state_forwards(app_label, second_state)
atomic_rename = connection.features.supports_atomic_references_rename
with connection.schema_editor(atomic=atomic_rename) as editor:
operation.database_forwards(app_label, editor, first_state, second_state)
self.assertTableExists(new_m2m_table)
self.assertTableNotExists(original_m2m_table)
# And test reversal
with connection.schema_editor(atomic=atomic_rename) as editor:
operation.database_backwards(app_label, editor, second_state, first_state)
self.assertTableExists(original_m2m_table)
self.assertTableNotExists(new_m2m_table)
def test_alter_field(self):
"""
Tests the AlterField operation.
"""
project_state = self.set_up_test_model("test_alfl")
# Test the state alteration
operation = migrations.AlterField("Pony", "pink", models.IntegerField(null=True))
self.assertEqual(operation.describe(), "Alter field pink on Pony")
new_state = project_state.clone()
operation.state_forwards("test_alfl", new_state)
self.assertIs(project_state.models["test_alfl", "pony"].get_field_by_name("pink").null, False)
self.assertIs(new_state.models["test_alfl", "pony"].get_field_by_name("pink").null, True)
# Test the database alteration
self.assertColumnNotNull("test_alfl_pony", "pink")
with connection.schema_editor() as editor:
operation.database_forwards("test_alfl", editor, project_state, new_state)
self.assertColumnNull("test_alfl_pony", "pink")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_alfl", editor, new_state, project_state)
self.assertColumnNotNull("test_alfl_pony", "pink")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AlterField")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["field", "model_name", "name"])
def test_alter_field_pk(self):
"""
Tests the AlterField operation on primary keys (for things like PostgreSQL's SERIAL weirdness)
"""
project_state = self.set_up_test_model("test_alflpk")
# Test the state alteration
operation = migrations.AlterField("Pony", "id", models.IntegerField(primary_key=True))
new_state = project_state.clone()
operation.state_forwards("test_alflpk", new_state)
self.assertIsInstance(project_state.models["test_alflpk", "pony"].get_field_by_name("id"), models.AutoField)
self.assertIsInstance(new_state.models["test_alflpk", "pony"].get_field_by_name("id"), models.IntegerField)
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_alflpk", editor, project_state, new_state)
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_alflpk", editor, new_state, project_state)
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_field_pk_fk(self):
"""
Tests the AlterField operation on primary keys changes any FKs pointing to it.
"""
project_state = self.set_up_test_model("test_alflpkfk", related_model=True)
# Test the state alteration
operation = migrations.AlterField("Pony", "id", models.FloatField(primary_key=True))
new_state = project_state.clone()
operation.state_forwards("test_alflpkfk", new_state)
self.assertIsInstance(project_state.models["test_alflpkfk", "pony"].get_field_by_name("id"), models.AutoField)
self.assertIsInstance(new_state.models["test_alflpkfk", "pony"].get_field_by_name("id"), models.FloatField)
def assertIdTypeEqualsFkType():
with connection.cursor() as cursor:
id_type, id_null = [
(c.type_code, c.null_ok)
for c in connection.introspection.get_table_description(cursor, "test_alflpkfk_pony")
if c.name == "id"
][0]
fk_type, fk_null = [
(c.type_code, c.null_ok)
for c in connection.introspection.get_table_description(cursor, "test_alflpkfk_rider")
if c.name == "pony_id"
][0]
self.assertEqual(id_type, fk_type)
self.assertEqual(id_null, fk_null)
assertIdTypeEqualsFkType()
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_alflpkfk", editor, project_state, new_state)
assertIdTypeEqualsFkType()
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_alflpkfk", editor, new_state, project_state)
assertIdTypeEqualsFkType()
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_field_reloads_state_on_fk_with_to_field_target_type_change(self):
app_label = 'test_alflrsfkwtflttc'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Rider', fields=[
('id', models.AutoField(primary_key=True)),
('code', models.PositiveIntegerField(unique=True)),
]),
migrations.CreateModel('Pony', fields=[
('id', models.AutoField(primary_key=True)),
('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE, to_field='code')),
]),
])
operation = migrations.AlterField(
'Rider',
'code',
models.CharField(max_length=100, unique=True),
)
self.apply_operations(app_label, project_state, operations=[operation])
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_field_reloads_state_on_fk_with_to_field_related_name_target_type_change(self):
app_label = 'test_alflrsfkwtflrnttc'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Rider', fields=[
('id', models.AutoField(primary_key=True)),
('code', models.PositiveIntegerField(unique=True)),
]),
migrations.CreateModel('Pony', fields=[
('id', models.AutoField(primary_key=True)),
('rider', models.ForeignKey(
'%s.Rider' % app_label,
models.CASCADE,
to_field='code',
related_name='+',
)),
]),
])
operation = migrations.AlterField(
'Rider',
'code',
models.CharField(max_length=100, unique=True),
)
self.apply_operations(app_label, project_state, operations=[operation])
def test_alter_field_reloads_state_on_fk_target_changes(self):
"""
If AlterField doesn't reload state appropriately, the second AlterField
crashes on MySQL due to not dropping the PonyRider.pony foreign key
constraint before modifying the column.
"""
app_label = 'alter_alter_field_reloads_state_on_fk_target_changes'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Rider', fields=[
('id', models.CharField(primary_key=True, max_length=100)),
]),
migrations.CreateModel('Pony', fields=[
('id', models.CharField(primary_key=True, max_length=100)),
('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE)),
]),
migrations.CreateModel('PonyRider', fields=[
('id', models.AutoField(primary_key=True)),
('pony', models.ForeignKey('%s.Pony' % app_label, models.CASCADE)),
]),
])
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.AlterField('Rider', 'id', models.CharField(primary_key=True, max_length=99)),
migrations.AlterField('Pony', 'id', models.CharField(primary_key=True, max_length=99)),
])
def test_alter_field_reloads_state_on_fk_with_to_field_target_changes(self):
"""
If AlterField doesn't reload state appropriately, the second AlterField
crashes on MySQL due to not dropping the PonyRider.pony foreign key
constraint before modifying the column.
"""
app_label = 'alter_alter_field_reloads_state_on_fk_with_to_field_target_changes'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Rider', fields=[
('id', models.CharField(primary_key=True, max_length=100)),
('slug', models.CharField(unique=True, max_length=100)),
]),
migrations.CreateModel('Pony', fields=[
('id', models.CharField(primary_key=True, max_length=100)),
('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE, to_field='slug')),
('slug', models.CharField(unique=True, max_length=100)),
]),
migrations.CreateModel('PonyRider', fields=[
('id', models.AutoField(primary_key=True)),
('pony', models.ForeignKey('%s.Pony' % app_label, models.CASCADE, to_field='slug')),
]),
])
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.AlterField('Rider', 'slug', models.CharField(unique=True, max_length=99)),
migrations.AlterField('Pony', 'slug', models.CharField(unique=True, max_length=99)),
])
def test_rename_field_reloads_state_on_fk_target_changes(self):
"""
If RenameField doesn't reload state appropriately, the AlterField
crashes on MySQL due to not dropping the PonyRider.pony foreign key
constraint before modifying the column.
"""
app_label = 'alter_rename_field_reloads_state_on_fk_target_changes'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Rider', fields=[
('id', models.CharField(primary_key=True, max_length=100)),
]),
migrations.CreateModel('Pony', fields=[
('id', models.CharField(primary_key=True, max_length=100)),
('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE)),
]),
migrations.CreateModel('PonyRider', fields=[
('id', models.AutoField(primary_key=True)),
('pony', models.ForeignKey('%s.Pony' % app_label, models.CASCADE)),
]),
])
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.RenameField('Rider', 'id', 'id2'),
migrations.AlterField('Pony', 'id', models.CharField(primary_key=True, max_length=99)),
], atomic=connection.features.supports_atomic_references_rename)
def test_rename_field(self):
"""
Tests the RenameField operation.
"""
project_state = self.set_up_test_model("test_rnfl", unique_together=True, index_together=True)
# Test the state alteration
operation = migrations.RenameField("Pony", "pink", "blue")
self.assertEqual(operation.describe(), "Rename field pink on Pony to blue")
new_state = project_state.clone()
operation.state_forwards("test_rnfl", new_state)
self.assertIn("blue", [n for n, f in new_state.models["test_rnfl", "pony"].fields])
self.assertNotIn("pink", [n for n, f in new_state.models["test_rnfl", "pony"].fields])
# Make sure the unique_together has the renamed column too
self.assertIn("blue", new_state.models["test_rnfl", "pony"].options['unique_together'][0])
self.assertNotIn("pink", new_state.models["test_rnfl", "pony"].options['unique_together'][0])
# Make sure the index_together has the renamed column too
self.assertIn("blue", new_state.models["test_rnfl", "pony"].options['index_together'][0])
self.assertNotIn("pink", new_state.models["test_rnfl", "pony"].options['index_together'][0])
# Test the database alteration
self.assertColumnExists("test_rnfl_pony", "pink")
self.assertColumnNotExists("test_rnfl_pony", "blue")
with connection.schema_editor() as editor:
operation.database_forwards("test_rnfl", editor, project_state, new_state)
self.assertColumnExists("test_rnfl_pony", "blue")
self.assertColumnNotExists("test_rnfl_pony", "pink")
# Ensure the unique constraint has been ported over
with connection.cursor() as cursor:
cursor.execute("INSERT INTO test_rnfl_pony (blue, weight) VALUES (1, 1)")
with self.assertRaises(IntegrityError):
with atomic():
cursor.execute("INSERT INTO test_rnfl_pony (blue, weight) VALUES (1, 1)")
cursor.execute("DELETE FROM test_rnfl_pony")
# Ensure the index constraint has been ported over
self.assertIndexExists("test_rnfl_pony", ["weight", "blue"])
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_rnfl", editor, new_state, project_state)
self.assertColumnExists("test_rnfl_pony", "pink")
self.assertColumnNotExists("test_rnfl_pony", "blue")
# Ensure the index constraint has been reset
self.assertIndexExists("test_rnfl_pony", ["weight", "pink"])
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "RenameField")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'model_name': "Pony", 'old_name': "pink", 'new_name': "blue"})
def test_rename_missing_field(self):
state = ProjectState()
state.add_model(ModelState('app', 'model', []))
with self.assertRaisesMessage(FieldDoesNotExist, "app.model has no field named 'field'"):
migrations.RenameField('model', 'field', 'new_field').state_forwards('app', state)
def test_rename_referenced_field_state_forward(self):
state = ProjectState()
state.add_model(ModelState('app', 'Model', [
('id', models.AutoField(primary_key=True)),
('field', models.IntegerField(unique=True)),
]))
state.add_model(ModelState('app', 'OtherModel', [
('id', models.AutoField(primary_key=True)),
('fk', models.ForeignKey('Model', models.CASCADE, to_field='field')),
('fo', models.ForeignObject('Model', models.CASCADE, from_fields=('fk',), to_fields=('field',))),
]))
operation = migrations.RenameField('Model', 'field', 'renamed')
new_state = state.clone()
operation.state_forwards('app', new_state)
self.assertEqual(new_state.models['app', 'othermodel'].fields[1][1].remote_field.field_name, 'renamed')
self.assertEqual(new_state.models['app', 'othermodel'].fields[1][1].from_fields, ['self'])
self.assertEqual(new_state.models['app', 'othermodel'].fields[1][1].to_fields, ('renamed',))
self.assertEqual(new_state.models['app', 'othermodel'].fields[2][1].from_fields, ('fk',))
self.assertEqual(new_state.models['app', 'othermodel'].fields[2][1].to_fields, ('renamed',))
operation = migrations.RenameField('OtherModel', 'fk', 'renamed_fk')
new_state = state.clone()
operation.state_forwards('app', new_state)
self.assertEqual(new_state.models['app', 'othermodel'].fields[1][1].remote_field.field_name, 'renamed')
self.assertEqual(new_state.models['app', 'othermodel'].fields[1][1].from_fields, ('self',))
self.assertEqual(new_state.models['app', 'othermodel'].fields[1][1].to_fields, ('renamed',))
self.assertEqual(new_state.models['app', 'othermodel'].fields[2][1].from_fields, ('renamed_fk',))
self.assertEqual(new_state.models['app', 'othermodel'].fields[2][1].to_fields, ('renamed',))
def test_alter_unique_together(self):
"""
Tests the AlterUniqueTogether operation.
"""
project_state = self.set_up_test_model("test_alunto")
# Test the state alteration
operation = migrations.AlterUniqueTogether("Pony", [("pink", "weight")])
self.assertEqual(operation.describe(), "Alter unique_together for Pony (1 constraint(s))")
new_state = project_state.clone()
operation.state_forwards("test_alunto", new_state)
self.assertEqual(len(project_state.models["test_alunto", "pony"].options.get("unique_together", set())), 0)
self.assertEqual(len(new_state.models["test_alunto", "pony"].options.get("unique_together", set())), 1)
# Make sure we can insert duplicate rows
with connection.cursor() as cursor:
cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
cursor.execute("DELETE FROM test_alunto_pony")
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_alunto", editor, project_state, new_state)
cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
with self.assertRaises(IntegrityError):
with atomic():
cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
cursor.execute("DELETE FROM test_alunto_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_alunto", editor, new_state, project_state)
cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
cursor.execute("DELETE FROM test_alunto_pony")
# Test flat unique_together
operation = migrations.AlterUniqueTogether("Pony", ("pink", "weight"))
operation.state_forwards("test_alunto", new_state)
self.assertEqual(len(new_state.models["test_alunto", "pony"].options.get("unique_together", set())), 1)
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AlterUniqueTogether")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'name': "Pony", 'unique_together': {("pink", "weight")}})
def test_alter_unique_together_remove(self):
operation = migrations.AlterUniqueTogether("Pony", None)
self.assertEqual(operation.describe(), "Alter unique_together for Pony (0 constraint(s))")
def test_add_index(self):
"""
Test the AddIndex operation.
"""
project_state = self.set_up_test_model("test_adin")
msg = (
"Indexes passed to AddIndex operations require a name argument. "
"<Index: fields='pink'> doesn't have one."
)
with self.assertRaisesMessage(ValueError, msg):
migrations.AddIndex("Pony", models.Index(fields=["pink"]))
index = models.Index(fields=["pink"], name="test_adin_pony_pink_idx")
operation = migrations.AddIndex("Pony", index)
self.assertEqual(operation.describe(), "Create index test_adin_pony_pink_idx on field(s) pink of model Pony")
new_state = project_state.clone()
operation.state_forwards("test_adin", new_state)
# Test the database alteration
self.assertEqual(len(new_state.models["test_adin", "pony"].options['indexes']), 1)
self.assertIndexNotExists("test_adin_pony", ["pink"])
with connection.schema_editor() as editor:
operation.database_forwards("test_adin", editor, project_state, new_state)
self.assertIndexExists("test_adin_pony", ["pink"])
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_adin", editor, new_state, project_state)
self.assertIndexNotExists("test_adin_pony", ["pink"])
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AddIndex")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'model_name': "Pony", 'index': index})
def test_remove_index(self):
"""
Test the RemoveIndex operation.
"""
project_state = self.set_up_test_model("test_rmin", multicol_index=True)
self.assertTableExists("test_rmin_pony")
self.assertIndexExists("test_rmin_pony", ["pink", "weight"])
operation = migrations.RemoveIndex("Pony", "pony_test_idx")
self.assertEqual(operation.describe(), "Remove index pony_test_idx from Pony")
new_state = project_state.clone()
operation.state_forwards("test_rmin", new_state)
# Test the state alteration
self.assertEqual(len(new_state.models["test_rmin", "pony"].options['indexes']), 0)
self.assertIndexExists("test_rmin_pony", ["pink", "weight"])
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_rmin", editor, project_state, new_state)
self.assertIndexNotExists("test_rmin_pony", ["pink", "weight"])
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_rmin", editor, new_state, project_state)
self.assertIndexExists("test_rmin_pony", ["pink", "weight"])
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "RemoveIndex")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'model_name': "Pony", 'name': "pony_test_idx"})
# Also test a field dropped with index - sqlite remake issue
operations = [
migrations.RemoveIndex("Pony", "pony_test_idx"),
migrations.RemoveField("Pony", "pink"),
]
self.assertColumnExists("test_rmin_pony", "pink")
self.assertIndexExists("test_rmin_pony", ["pink", "weight"])
# Test database alteration
new_state = project_state.clone()
self.apply_operations('test_rmin', new_state, operations=operations)
self.assertColumnNotExists("test_rmin_pony", "pink")
self.assertIndexNotExists("test_rmin_pony", ["pink", "weight"])
# And test reversal
self.unapply_operations("test_rmin", project_state, operations=operations)
self.assertIndexExists("test_rmin_pony", ["pink", "weight"])
def test_add_index_state_forwards(self):
project_state = self.set_up_test_model('test_adinsf')
index = models.Index(fields=['pink'], name='test_adinsf_pony_pink_idx')
old_model = project_state.apps.get_model('test_adinsf', 'Pony')
new_state = project_state.clone()
operation = migrations.AddIndex('Pony', index)
operation.state_forwards('test_adinsf', new_state)
new_model = new_state.apps.get_model('test_adinsf', 'Pony')
self.assertIsNot(old_model, new_model)
def test_remove_index_state_forwards(self):
project_state = self.set_up_test_model('test_rminsf')
index = models.Index(fields=['pink'], name='test_rminsf_pony_pink_idx')
migrations.AddIndex('Pony', index).state_forwards('test_rminsf', project_state)
old_model = project_state.apps.get_model('test_rminsf', 'Pony')
new_state = project_state.clone()
operation = migrations.RemoveIndex('Pony', 'test_rminsf_pony_pink_idx')
operation.state_forwards('test_rminsf', new_state)
new_model = new_state.apps.get_model('test_rminsf', 'Pony')
self.assertIsNot(old_model, new_model)
def test_alter_field_with_index(self):
"""
Test AlterField operation with an index to ensure indexes created via
Meta.indexes don't get dropped with sqlite3 remake.
"""
project_state = self.set_up_test_model("test_alflin", index=True)
operation = migrations.AlterField("Pony", "pink", models.IntegerField(null=True))
new_state = project_state.clone()
operation.state_forwards("test_alflin", new_state)
# Test the database alteration
self.assertColumnNotNull("test_alflin_pony", "pink")
with connection.schema_editor() as editor:
operation.database_forwards("test_alflin", editor, project_state, new_state)
# Index hasn't been dropped
self.assertIndexExists("test_alflin_pony", ["pink"])
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_alflin", editor, new_state, project_state)
# Ensure the index is still there
self.assertIndexExists("test_alflin_pony", ["pink"])
def test_alter_index_together(self):
"""
Tests the AlterIndexTogether operation.
"""
project_state = self.set_up_test_model("test_alinto")
# Test the state alteration
operation = migrations.AlterIndexTogether("Pony", [("pink", "weight")])
self.assertEqual(operation.describe(), "Alter index_together for Pony (1 constraint(s))")
new_state = project_state.clone()
operation.state_forwards("test_alinto", new_state)
self.assertEqual(len(project_state.models["test_alinto", "pony"].options.get("index_together", set())), 0)
self.assertEqual(len(new_state.models["test_alinto", "pony"].options.get("index_together", set())), 1)
# Make sure there's no matching index
self.assertIndexNotExists("test_alinto_pony", ["pink", "weight"])
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_alinto", editor, project_state, new_state)
self.assertIndexExists("test_alinto_pony", ["pink", "weight"])
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_alinto", editor, new_state, project_state)
self.assertIndexNotExists("test_alinto_pony", ["pink", "weight"])
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AlterIndexTogether")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'name': "Pony", 'index_together': {("pink", "weight")}})
def test_alter_index_together_remove(self):
operation = migrations.AlterIndexTogether("Pony", None)
self.assertEqual(operation.describe(), "Alter index_together for Pony (0 constraint(s))")
@skipUnlessDBFeature('supports_table_check_constraints')
def test_add_constraint(self):
project_state = self.set_up_test_model("test_addconstraint")
gt_check = models.Q(pink__gt=2)
gt_constraint = models.CheckConstraint(check=gt_check, name="test_add_constraint_pony_pink_gt_2")
gt_operation = migrations.AddConstraint("Pony", gt_constraint)
self.assertEqual(
gt_operation.describe(), "Create constraint test_add_constraint_pony_pink_gt_2 on model Pony"
)
# Test the state alteration
new_state = project_state.clone()
gt_operation.state_forwards("test_addconstraint", new_state)
self.assertEqual(len(new_state.models["test_addconstraint", "pony"].options["constraints"]), 1)
Pony = new_state.apps.get_model("test_addconstraint", "Pony")
self.assertEqual(len(Pony._meta.constraints), 1)
# Test the database alteration
with connection.schema_editor() as editor:
gt_operation.database_forwards("test_addconstraint", editor, project_state, new_state)
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=1, weight=1.0)
# Add another one.
lt_check = models.Q(pink__lt=100)
lt_constraint = models.CheckConstraint(check=lt_check, name="test_add_constraint_pony_pink_lt_100")
lt_operation = migrations.AddConstraint("Pony", lt_constraint)
lt_operation.state_forwards("test_addconstraint", new_state)
self.assertEqual(len(new_state.models["test_addconstraint", "pony"].options["constraints"]), 2)
Pony = new_state.apps.get_model("test_addconstraint", "Pony")
self.assertEqual(len(Pony._meta.constraints), 2)
with connection.schema_editor() as editor:
lt_operation.database_forwards("test_addconstraint", editor, project_state, new_state)
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=100, weight=1.0)
# Test reversal
with connection.schema_editor() as editor:
gt_operation.database_backwards("test_addconstraint", editor, new_state, project_state)
Pony.objects.create(pink=1, weight=1.0)
# Test deconstruction
definition = gt_operation.deconstruct()
self.assertEqual(definition[0], "AddConstraint")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'model_name': "Pony", 'constraint': gt_constraint})
@skipUnlessDBFeature('supports_table_check_constraints')
def test_add_constraint_percent_escaping(self):
app_label = 'add_constraint_string_quoting'
operations = [
CreateModel(
'Author',
fields=[
('id', models.AutoField(primary_key=True)),
('name', models.CharField(max_length=100)),
('rebate', models.CharField(max_length=100)),
],
),
]
from_state = self.apply_operations(app_label, ProjectState(), operations)
# "%" generated in startswith lookup should be escaped in a way that is
# considered a leading wildcard.
check = models.Q(name__startswith='Albert')
constraint = models.CheckConstraint(check=check, name='name_constraint')
operation = migrations.AddConstraint('Author', constraint)
to_state = from_state.clone()
operation.state_forwards(app_label, to_state)
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, from_state, to_state)
Author = to_state.apps.get_model(app_label, 'Author')
with self.assertRaises(IntegrityError), transaction.atomic():
Author.objects.create(name='Artur')
# Literal "%" should be escaped in a way that is not a considered a
# wildcard.
check = models.Q(rebate__endswith='%')
constraint = models.CheckConstraint(check=check, name='rebate_constraint')
operation = migrations.AddConstraint('Author', constraint)
from_state = to_state
to_state = from_state.clone()
operation.state_forwards(app_label, to_state)
Author = to_state.apps.get_model(app_label, 'Author')
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, from_state, to_state)
Author = to_state.apps.get_model(app_label, 'Author')
with self.assertRaises(IntegrityError), transaction.atomic():
Author.objects.create(name='Albert', rebate='10$')
author = Author.objects.create(name='Albert', rebate='10%')
self.assertEqual(Author.objects.get(), author)
@skipUnlessDBFeature('supports_table_check_constraints')
def test_add_or_constraint(self):
app_label = 'test_addorconstraint'
constraint_name = 'add_constraint_or'
from_state = self.set_up_test_model(app_label)
check = models.Q(pink__gt=2, weight__gt=2) | models.Q(weight__lt=0)
constraint = models.CheckConstraint(check=check, name=constraint_name)
operation = migrations.AddConstraint('Pony', constraint)
to_state = from_state.clone()
operation.state_forwards(app_label, to_state)
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, from_state, to_state)
Pony = to_state.apps.get_model(app_label, 'Pony')
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=2, weight=3.0)
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=3, weight=1.0)
Pony.objects.bulk_create([
Pony(pink=3, weight=-1.0),
Pony(pink=1, weight=-1.0),
Pony(pink=3, weight=3.0),
])
@skipUnlessDBFeature('supports_table_check_constraints')
def test_add_constraint_combinable(self):
app_label = 'test_addconstraint_combinable'
operations = [
CreateModel(
'Book',
fields=[
('id', models.AutoField(primary_key=True)),
('read', models.PositiveIntegerField()),
('unread', models.PositiveIntegerField()),
],
),
]
from_state = self.apply_operations(app_label, ProjectState(), operations)
constraint = models.CheckConstraint(
check=models.Q(read=(100 - models.F('unread'))),
name='test_addconstraint_combinable_sum_100',
)
operation = migrations.AddConstraint('Book', constraint)
to_state = from_state.clone()
operation.state_forwards(app_label, to_state)
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, from_state, to_state)
Book = to_state.apps.get_model(app_label, 'Book')
with self.assertRaises(IntegrityError), transaction.atomic():
Book.objects.create(read=70, unread=10)
Book.objects.create(read=70, unread=30)
@skipUnlessDBFeature('supports_table_check_constraints')
def test_remove_constraint(self):
project_state = self.set_up_test_model("test_removeconstraint", constraints=[
models.CheckConstraint(check=models.Q(pink__gt=2), name="test_remove_constraint_pony_pink_gt_2"),
models.CheckConstraint(check=models.Q(pink__lt=100), name="test_remove_constraint_pony_pink_lt_100"),
])
gt_operation = migrations.RemoveConstraint("Pony", "test_remove_constraint_pony_pink_gt_2")
self.assertEqual(
gt_operation.describe(), "Remove constraint test_remove_constraint_pony_pink_gt_2 from model Pony"
)
# Test state alteration
new_state = project_state.clone()
gt_operation.state_forwards("test_removeconstraint", new_state)
self.assertEqual(len(new_state.models["test_removeconstraint", "pony"].options['constraints']), 1)
Pony = new_state.apps.get_model("test_removeconstraint", "Pony")
self.assertEqual(len(Pony._meta.constraints), 1)
# Test database alteration
with connection.schema_editor() as editor:
gt_operation.database_forwards("test_removeconstraint", editor, project_state, new_state)
Pony.objects.create(pink=1, weight=1.0).delete()
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=100, weight=1.0)
# Remove the other one.
lt_operation = migrations.RemoveConstraint("Pony", "test_remove_constraint_pony_pink_lt_100")
lt_operation.state_forwards("test_removeconstraint", new_state)
self.assertEqual(len(new_state.models["test_removeconstraint", "pony"].options['constraints']), 0)
Pony = new_state.apps.get_model("test_removeconstraint", "Pony")
self.assertEqual(len(Pony._meta.constraints), 0)
with connection.schema_editor() as editor:
lt_operation.database_forwards("test_removeconstraint", editor, project_state, new_state)
Pony.objects.create(pink=100, weight=1.0).delete()
# Test reversal
with connection.schema_editor() as editor:
gt_operation.database_backwards("test_removeconstraint", editor, new_state, project_state)
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=1, weight=1.0)
# Test deconstruction
definition = gt_operation.deconstruct()
self.assertEqual(definition[0], "RemoveConstraint")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'model_name': "Pony", 'name': "test_remove_constraint_pony_pink_gt_2"})
def test_add_partial_unique_constraint(self):
project_state = self.set_up_test_model('test_addpartialuniqueconstraint')
partial_unique_constraint = models.UniqueConstraint(
fields=['pink'],
condition=models.Q(weight__gt=5),
name='test_constraint_pony_pink_for_weight_gt_5_uniq',
)
operation = migrations.AddConstraint('Pony', partial_unique_constraint)
self.assertEqual(
operation.describe(),
'Create constraint test_constraint_pony_pink_for_weight_gt_5_uniq '
'on model Pony'
)
# Test the state alteration
new_state = project_state.clone()
operation.state_forwards('test_addpartialuniqueconstraint', new_state)
self.assertEqual(len(new_state.models['test_addpartialuniqueconstraint', 'pony'].options['constraints']), 1)
Pony = new_state.apps.get_model('test_addpartialuniqueconstraint', 'Pony')
self.assertEqual(len(Pony._meta.constraints), 1)
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards('test_addpartialuniqueconstraint', editor, project_state, new_state)
# Test constraint works
Pony.objects.create(pink=1, weight=4.0)
Pony.objects.create(pink=1, weight=4.0)
Pony.objects.create(pink=1, weight=6.0)
if connection.features.supports_partial_indexes:
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=1, weight=7.0)
else:
Pony.objects.create(pink=1, weight=7.0)
# Test reversal
with connection.schema_editor() as editor:
operation.database_backwards('test_addpartialuniqueconstraint', editor, new_state, project_state)
# Test constraint doesn't work
Pony.objects.create(pink=1, weight=7.0)
# Test deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], 'AddConstraint')
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'model_name': 'Pony', 'constraint': partial_unique_constraint})
def test_remove_partial_unique_constraint(self):
project_state = self.set_up_test_model('test_removepartialuniqueconstraint', constraints=[
models.UniqueConstraint(
fields=['pink'],
condition=models.Q(weight__gt=5),
name='test_constraint_pony_pink_for_weight_gt_5_uniq',
),
])
gt_operation = migrations.RemoveConstraint('Pony', 'test_constraint_pony_pink_for_weight_gt_5_uniq')
self.assertEqual(
gt_operation.describe(), 'Remove constraint test_constraint_pony_pink_for_weight_gt_5_uniq from model Pony'
)
# Test state alteration
new_state = project_state.clone()
gt_operation.state_forwards('test_removepartialuniqueconstraint', new_state)
self.assertEqual(len(new_state.models['test_removepartialuniqueconstraint', 'pony'].options['constraints']), 0)
Pony = new_state.apps.get_model('test_removepartialuniqueconstraint', 'Pony')
self.assertEqual(len(Pony._meta.constraints), 0)
# Test database alteration
with connection.schema_editor() as editor:
gt_operation.database_forwards('test_removepartialuniqueconstraint', editor, project_state, new_state)
# Test constraint doesn't work
Pony.objects.create(pink=1, weight=4.0)
Pony.objects.create(pink=1, weight=4.0)
Pony.objects.create(pink=1, weight=6.0)
Pony.objects.create(pink=1, weight=7.0).delete()
# Test reversal
with connection.schema_editor() as editor:
gt_operation.database_backwards('test_removepartialuniqueconstraint', editor, new_state, project_state)
# Test constraint works
if connection.features.supports_partial_indexes:
with self.assertRaises(IntegrityError), transaction.atomic():
Pony.objects.create(pink=1, weight=7.0)
else:
Pony.objects.create(pink=1, weight=7.0)
# Test deconstruction
definition = gt_operation.deconstruct()
self.assertEqual(definition[0], 'RemoveConstraint')
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {
'model_name': 'Pony',
'name': 'test_constraint_pony_pink_for_weight_gt_5_uniq',
})
def test_alter_model_options(self):
"""
Tests the AlterModelOptions operation.
"""
project_state = self.set_up_test_model("test_almoop")
# Test the state alteration (no DB alteration to test)
operation = migrations.AlterModelOptions("Pony", {"permissions": [("can_groom", "Can groom")]})
self.assertEqual(operation.describe(), "Change Meta options on Pony")
new_state = project_state.clone()
operation.state_forwards("test_almoop", new_state)
self.assertEqual(len(project_state.models["test_almoop", "pony"].options.get("permissions", [])), 0)
self.assertEqual(len(new_state.models["test_almoop", "pony"].options.get("permissions", [])), 1)
self.assertEqual(new_state.models["test_almoop", "pony"].options["permissions"][0][0], "can_groom")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AlterModelOptions")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'name': "Pony", 'options': {"permissions": [("can_groom", "Can groom")]}})
def test_alter_model_options_emptying(self):
"""
The AlterModelOptions operation removes keys from the dict (#23121)
"""
project_state = self.set_up_test_model("test_almoop", options=True)
# Test the state alteration (no DB alteration to test)
operation = migrations.AlterModelOptions("Pony", {})
self.assertEqual(operation.describe(), "Change Meta options on Pony")
new_state = project_state.clone()
operation.state_forwards("test_almoop", new_state)
self.assertEqual(len(project_state.models["test_almoop", "pony"].options.get("permissions", [])), 1)
self.assertEqual(len(new_state.models["test_almoop", "pony"].options.get("permissions", [])), 0)
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AlterModelOptions")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'name': "Pony", 'options': {}})
def test_alter_order_with_respect_to(self):
"""
Tests the AlterOrderWithRespectTo operation.
"""
project_state = self.set_up_test_model("test_alorwrtto", related_model=True)
# Test the state alteration
operation = migrations.AlterOrderWithRespectTo("Rider", "pony")
self.assertEqual(operation.describe(), "Set order_with_respect_to on Rider to pony")
new_state = project_state.clone()
operation.state_forwards("test_alorwrtto", new_state)
self.assertIsNone(
project_state.models["test_alorwrtto", "rider"].options.get("order_with_respect_to", None)
)
self.assertEqual(
new_state.models["test_alorwrtto", "rider"].options.get("order_with_respect_to", None),
"pony"
)
# Make sure there's no matching index
self.assertColumnNotExists("test_alorwrtto_rider", "_order")
# Create some rows before alteration
rendered_state = project_state.apps
pony = rendered_state.get_model("test_alorwrtto", "Pony").objects.create(weight=50)
rendered_state.get_model("test_alorwrtto", "Rider").objects.create(pony=pony, friend_id=1)
rendered_state.get_model("test_alorwrtto", "Rider").objects.create(pony=pony, friend_id=2)
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_alorwrtto", editor, project_state, new_state)
self.assertColumnExists("test_alorwrtto_rider", "_order")
# Check for correct value in rows
updated_riders = new_state.apps.get_model("test_alorwrtto", "Rider").objects.all()
self.assertEqual(updated_riders[0]._order, 0)
self.assertEqual(updated_riders[1]._order, 0)
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_alorwrtto", editor, new_state, project_state)
self.assertColumnNotExists("test_alorwrtto_rider", "_order")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "AlterOrderWithRespectTo")
self.assertEqual(definition[1], [])
self.assertEqual(definition[2], {'name': "Rider", 'order_with_respect_to': "pony"})
def test_alter_model_managers(self):
"""
The managers on a model are set.
"""
project_state = self.set_up_test_model("test_almoma")
# Test the state alteration
operation = migrations.AlterModelManagers(
"Pony",
managers=[
("food_qs", FoodQuerySet.as_manager()),
("food_mgr", FoodManager("a", "b")),
("food_mgr_kwargs", FoodManager("x", "y", 3, 4)),
]
)
self.assertEqual(operation.describe(), "Change managers on Pony")
managers = project_state.models["test_almoma", "pony"].managers
self.assertEqual(managers, [])
new_state = project_state.clone()
operation.state_forwards("test_almoma", new_state)
self.assertIn(("test_almoma", "pony"), new_state.models)
managers = new_state.models["test_almoma", "pony"].managers
self.assertEqual(managers[0][0], "food_qs")
self.assertIsInstance(managers[0][1], models.Manager)
self.assertEqual(managers[1][0], "food_mgr")
self.assertIsInstance(managers[1][1], FoodManager)
self.assertEqual(managers[1][1].args, ("a", "b", 1, 2))
self.assertEqual(managers[2][0], "food_mgr_kwargs")
self.assertIsInstance(managers[2][1], FoodManager)
self.assertEqual(managers[2][1].args, ("x", "y", 3, 4))
rendered_state = new_state.apps
model = rendered_state.get_model('test_almoma', 'pony')
self.assertIsInstance(model.food_qs, models.Manager)
self.assertIsInstance(model.food_mgr, FoodManager)
self.assertIsInstance(model.food_mgr_kwargs, FoodManager)
def test_alter_model_managers_emptying(self):
"""
The managers on a model are set.
"""
project_state = self.set_up_test_model("test_almomae", manager_model=True)
# Test the state alteration
operation = migrations.AlterModelManagers("Food", managers=[])
self.assertEqual(operation.describe(), "Change managers on Food")
self.assertIn(("test_almomae", "food"), project_state.models)
managers = project_state.models["test_almomae", "food"].managers
self.assertEqual(managers[0][0], "food_qs")
self.assertIsInstance(managers[0][1], models.Manager)
self.assertEqual(managers[1][0], "food_mgr")
self.assertIsInstance(managers[1][1], FoodManager)
self.assertEqual(managers[1][1].args, ("a", "b", 1, 2))
self.assertEqual(managers[2][0], "food_mgr_kwargs")
self.assertIsInstance(managers[2][1], FoodManager)
self.assertEqual(managers[2][1].args, ("x", "y", 3, 4))
new_state = project_state.clone()
operation.state_forwards("test_almomae", new_state)
managers = new_state.models["test_almomae", "food"].managers
self.assertEqual(managers, [])
def test_alter_fk(self):
"""
Creating and then altering an FK works correctly
and deals with the pending SQL (#23091)
"""
project_state = self.set_up_test_model("test_alfk")
# Test adding and then altering the FK in one go
create_operation = migrations.CreateModel(
name="Rider",
fields=[
("id", models.AutoField(primary_key=True)),
("pony", models.ForeignKey("Pony", models.CASCADE)),
],
)
create_state = project_state.clone()
create_operation.state_forwards("test_alfk", create_state)
alter_operation = migrations.AlterField(
model_name='Rider',
name='pony',
field=models.ForeignKey("Pony", models.CASCADE, editable=False),
)
alter_state = create_state.clone()
alter_operation.state_forwards("test_alfk", alter_state)
with connection.schema_editor() as editor:
create_operation.database_forwards("test_alfk", editor, project_state, create_state)
alter_operation.database_forwards("test_alfk", editor, create_state, alter_state)
def test_alter_fk_non_fk(self):
"""
Altering an FK to a non-FK works (#23244)
"""
# Test the state alteration
operation = migrations.AlterField(
model_name="Rider",
name="pony",
field=models.FloatField(),
)
project_state, new_state = self.make_test_state("test_afknfk", operation, related_model=True)
# Test the database alteration
self.assertColumnExists("test_afknfk_rider", "pony_id")
self.assertColumnNotExists("test_afknfk_rider", "pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_afknfk", editor, project_state, new_state)
self.assertColumnExists("test_afknfk_rider", "pony")
self.assertColumnNotExists("test_afknfk_rider", "pony_id")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_afknfk", editor, new_state, project_state)
self.assertColumnExists("test_afknfk_rider", "pony_id")
self.assertColumnNotExists("test_afknfk_rider", "pony")
def test_run_sql(self):
"""
Tests the RunSQL operation.
"""
project_state = self.set_up_test_model("test_runsql")
# Create the operation
operation = migrations.RunSQL(
# Use a multi-line string with a comment to test splitting on SQLite and MySQL respectively
"CREATE TABLE i_love_ponies (id int, special_thing varchar(15));\n"
"INSERT INTO i_love_ponies (id, special_thing) VALUES (1, 'i love ponies'); -- this is magic!\n"
"INSERT INTO i_love_ponies (id, special_thing) VALUES (2, 'i love django');\n"
"UPDATE i_love_ponies SET special_thing = 'Ponies' WHERE special_thing LIKE '%%ponies';"
"UPDATE i_love_ponies SET special_thing = 'Django' WHERE special_thing LIKE '%django';",
# Run delete queries to test for parameter substitution failure
# reported in #23426
"DELETE FROM i_love_ponies WHERE special_thing LIKE '%Django%';"
"DELETE FROM i_love_ponies WHERE special_thing LIKE '%%Ponies%%';"
"DROP TABLE i_love_ponies",
state_operations=[migrations.CreateModel("SomethingElse", [("id", models.AutoField(primary_key=True))])],
)
self.assertEqual(operation.describe(), "Raw SQL operation")
# Test the state alteration
new_state = project_state.clone()
operation.state_forwards("test_runsql", new_state)
self.assertEqual(len(new_state.models["test_runsql", "somethingelse"].fields), 1)
# Make sure there's no table
self.assertTableNotExists("i_love_ponies")
# Test SQL collection
with connection.schema_editor(collect_sql=True) as editor:
operation.database_forwards("test_runsql", editor, project_state, new_state)
self.assertIn("LIKE '%%ponies';", "\n".join(editor.collected_sql))
operation.database_backwards("test_runsql", editor, project_state, new_state)
self.assertIn("LIKE '%%Ponies%%';", "\n".join(editor.collected_sql))
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_runsql", editor, project_state, new_state)
self.assertTableExists("i_love_ponies")
# Make sure all the SQL was processed
with connection.cursor() as cursor:
cursor.execute("SELECT COUNT(*) FROM i_love_ponies")
self.assertEqual(cursor.fetchall()[0][0], 2)
cursor.execute("SELECT COUNT(*) FROM i_love_ponies WHERE special_thing = 'Django'")
self.assertEqual(cursor.fetchall()[0][0], 1)
cursor.execute("SELECT COUNT(*) FROM i_love_ponies WHERE special_thing = 'Ponies'")
self.assertEqual(cursor.fetchall()[0][0], 1)
# And test reversal
self.assertTrue(operation.reversible)
with connection.schema_editor() as editor:
operation.database_backwards("test_runsql", editor, new_state, project_state)
self.assertTableNotExists("i_love_ponies")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "RunSQL")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["reverse_sql", "sql", "state_operations"])
# And elidable reduction
self.assertIs(False, operation.reduce(operation, []))
elidable_operation = migrations.RunSQL('SELECT 1 FROM void;', elidable=True)
self.assertEqual(elidable_operation.reduce(operation, []), [operation])
def test_run_sql_params(self):
"""
#23426 - RunSQL should accept parameters.
"""
project_state = self.set_up_test_model("test_runsql")
# Create the operation
operation = migrations.RunSQL(
["CREATE TABLE i_love_ponies (id int, special_thing varchar(15));"],
["DROP TABLE i_love_ponies"],
)
param_operation = migrations.RunSQL(
# forwards
(
"INSERT INTO i_love_ponies (id, special_thing) VALUES (1, 'Django');",
["INSERT INTO i_love_ponies (id, special_thing) VALUES (2, %s);", ['Ponies']],
("INSERT INTO i_love_ponies (id, special_thing) VALUES (%s, %s);", (3, 'Python',)),
),
# backwards
[
"DELETE FROM i_love_ponies WHERE special_thing = 'Django';",
["DELETE FROM i_love_ponies WHERE special_thing = 'Ponies';", None],
("DELETE FROM i_love_ponies WHERE id = %s OR special_thing = %s;", [3, 'Python']),
]
)
# Make sure there's no table
self.assertTableNotExists("i_love_ponies")
new_state = project_state.clone()
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_runsql", editor, project_state, new_state)
# Test parameter passing
with connection.schema_editor() as editor:
param_operation.database_forwards("test_runsql", editor, project_state, new_state)
# Make sure all the SQL was processed
with connection.cursor() as cursor:
cursor.execute("SELECT COUNT(*) FROM i_love_ponies")
self.assertEqual(cursor.fetchall()[0][0], 3)
with connection.schema_editor() as editor:
param_operation.database_backwards("test_runsql", editor, new_state, project_state)
with connection.cursor() as cursor:
cursor.execute("SELECT COUNT(*) FROM i_love_ponies")
self.assertEqual(cursor.fetchall()[0][0], 0)
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_runsql", editor, new_state, project_state)
self.assertTableNotExists("i_love_ponies")
def test_run_sql_params_invalid(self):
"""
#23426 - RunSQL should fail when a list of statements with an incorrect
number of tuples is given.
"""
project_state = self.set_up_test_model("test_runsql")
new_state = project_state.clone()
operation = migrations.RunSQL(
# forwards
[
["INSERT INTO foo (bar) VALUES ('buz');"]
],
# backwards
(
("DELETE FROM foo WHERE bar = 'buz';", 'invalid', 'parameter count'),
),
)
with connection.schema_editor() as editor:
with self.assertRaisesMessage(ValueError, "Expected a 2-tuple but got 1"):
operation.database_forwards("test_runsql", editor, project_state, new_state)
with connection.schema_editor() as editor:
with self.assertRaisesMessage(ValueError, "Expected a 2-tuple but got 3"):
operation.database_backwards("test_runsql", editor, new_state, project_state)
def test_run_sql_noop(self):
"""
#24098 - Tests no-op RunSQL operations.
"""
operation = migrations.RunSQL(migrations.RunSQL.noop, migrations.RunSQL.noop)
with connection.schema_editor() as editor:
operation.database_forwards("test_runsql", editor, None, None)
operation.database_backwards("test_runsql", editor, None, None)
def test_run_python(self):
"""
Tests the RunPython operation
"""
project_state = self.set_up_test_model("test_runpython", mti_model=True)
# Create the operation
def inner_method(models, schema_editor):
Pony = models.get_model("test_runpython", "Pony")
Pony.objects.create(pink=1, weight=3.55)
Pony.objects.create(weight=5)
def inner_method_reverse(models, schema_editor):
Pony = models.get_model("test_runpython", "Pony")
Pony.objects.filter(pink=1, weight=3.55).delete()
Pony.objects.filter(weight=5).delete()
operation = migrations.RunPython(inner_method, reverse_code=inner_method_reverse)
self.assertEqual(operation.describe(), "Raw Python operation")
# Test the state alteration does nothing
new_state = project_state.clone()
operation.state_forwards("test_runpython", new_state)
self.assertEqual(new_state, project_state)
# Test the database alteration
self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 0)
with connection.schema_editor() as editor:
operation.database_forwards("test_runpython", editor, project_state, new_state)
self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 2)
# Now test reversal
self.assertTrue(operation.reversible)
with connection.schema_editor() as editor:
operation.database_backwards("test_runpython", editor, project_state, new_state)
self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 0)
# Now test we can't use a string
with self.assertRaisesMessage(ValueError, 'RunPython must be supplied with a callable'):
migrations.RunPython("print 'ahahaha'")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "RunPython")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["code", "reverse_code"])
# Also test reversal fails, with an operation identical to above but without reverse_code set
no_reverse_operation = migrations.RunPython(inner_method)
self.assertFalse(no_reverse_operation.reversible)
with connection.schema_editor() as editor:
no_reverse_operation.database_forwards("test_runpython", editor, project_state, new_state)
with self.assertRaises(NotImplementedError):
no_reverse_operation.database_backwards("test_runpython", editor, new_state, project_state)
self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 2)
def create_ponies(models, schema_editor):
Pony = models.get_model("test_runpython", "Pony")
pony1 = Pony.objects.create(pink=1, weight=3.55)
self.assertIsNot(pony1.pk, None)
pony2 = Pony.objects.create(weight=5)
self.assertIsNot(pony2.pk, None)
self.assertNotEqual(pony1.pk, pony2.pk)
operation = migrations.RunPython(create_ponies)
with connection.schema_editor() as editor:
operation.database_forwards("test_runpython", editor, project_state, new_state)
self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 4)
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "RunPython")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["code"])
def create_shetlandponies(models, schema_editor):
ShetlandPony = models.get_model("test_runpython", "ShetlandPony")
pony1 = ShetlandPony.objects.create(weight=4.0)
self.assertIsNot(pony1.pk, None)
pony2 = ShetlandPony.objects.create(weight=5.0)
self.assertIsNot(pony2.pk, None)
self.assertNotEqual(pony1.pk, pony2.pk)
operation = migrations.RunPython(create_shetlandponies)
with connection.schema_editor() as editor:
operation.database_forwards("test_runpython", editor, project_state, new_state)
self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 6)
self.assertEqual(project_state.apps.get_model("test_runpython", "ShetlandPony").objects.count(), 2)
# And elidable reduction
self.assertIs(False, operation.reduce(operation, []))
elidable_operation = migrations.RunPython(inner_method, elidable=True)
self.assertEqual(elidable_operation.reduce(operation, []), [operation])
def test_run_python_atomic(self):
"""
Tests the RunPython operation correctly handles the "atomic" keyword
"""
project_state = self.set_up_test_model("test_runpythonatomic", mti_model=True)
def inner_method(models, schema_editor):
Pony = models.get_model("test_runpythonatomic", "Pony")
Pony.objects.create(pink=1, weight=3.55)
raise ValueError("Adrian hates ponies.")
# Verify atomicity when applying.
atomic_migration = Migration("test", "test_runpythonatomic")
atomic_migration.operations = [migrations.RunPython(inner_method, reverse_code=inner_method)]
non_atomic_migration = Migration("test", "test_runpythonatomic")
non_atomic_migration.operations = [migrations.RunPython(inner_method, reverse_code=inner_method, atomic=False)]
# If we're a fully-transactional database, both versions should rollback
if connection.features.can_rollback_ddl:
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
non_atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
# Otherwise, the non-atomic operation should leave a row there
else:
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
non_atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 1)
# Reset object count to zero and verify atomicity when unapplying.
project_state.apps.get_model("test_runpythonatomic", "Pony").objects.all().delete()
# On a fully-transactional database, both versions rollback.
if connection.features.can_rollback_ddl:
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
atomic_migration.unapply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
non_atomic_migration.unapply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
# Otherwise, the non-atomic operation leaves a row there.
else:
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
atomic_migration.unapply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
non_atomic_migration.unapply(project_state, editor)
self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 1)
# Verify deconstruction.
definition = non_atomic_migration.operations[0].deconstruct()
self.assertEqual(definition[0], "RunPython")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["atomic", "code", "reverse_code"])
def test_run_python_related_assignment(self):
"""
#24282 - Model changes to a FK reverse side update the model
on the FK side as well.
"""
def inner_method(models, schema_editor):
Author = models.get_model("test_authors", "Author")
Book = models.get_model("test_books", "Book")
author = Author.objects.create(name="Hemingway")
Book.objects.create(title="Old Man and The Sea", author=author)
create_author = migrations.CreateModel(
"Author",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
],
options={},
)
create_book = migrations.CreateModel(
"Book",
[
("id", models.AutoField(primary_key=True)),
("title", models.CharField(max_length=100)),
("author", models.ForeignKey("test_authors.Author", models.CASCADE))
],
options={},
)
add_hometown = migrations.AddField(
"Author",
"hometown",
models.CharField(max_length=100),
)
create_old_man = migrations.RunPython(inner_method, inner_method)
project_state = ProjectState()
new_state = project_state.clone()
with connection.schema_editor() as editor:
create_author.state_forwards("test_authors", new_state)
create_author.database_forwards("test_authors", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
create_book.state_forwards("test_books", new_state)
create_book.database_forwards("test_books", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
add_hometown.state_forwards("test_authors", new_state)
add_hometown.database_forwards("test_authors", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
create_old_man.state_forwards("test_books", new_state)
create_old_man.database_forwards("test_books", editor, project_state, new_state)
def test_model_with_bigautofield(self):
"""
A model with BigAutoField can be created.
"""
def create_data(models, schema_editor):
Author = models.get_model("test_author", "Author")
Book = models.get_model("test_book", "Book")
author1 = Author.objects.create(name="Hemingway")
Book.objects.create(title="Old Man and The Sea", author=author1)
Book.objects.create(id=2 ** 33, title="A farewell to arms", author=author1)
author2 = Author.objects.create(id=2 ** 33, name="Remarque")
Book.objects.create(title="All quiet on the western front", author=author2)
Book.objects.create(title="Arc de Triomphe", author=author2)
create_author = migrations.CreateModel(
"Author",
[
("id", models.BigAutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
],
options={},
)
create_book = migrations.CreateModel(
"Book",
[
("id", models.BigAutoField(primary_key=True)),
("title", models.CharField(max_length=100)),
("author", models.ForeignKey(to="test_author.Author", on_delete=models.CASCADE))
],
options={},
)
fill_data = migrations.RunPython(create_data)
project_state = ProjectState()
new_state = project_state.clone()
with connection.schema_editor() as editor:
create_author.state_forwards("test_author", new_state)
create_author.database_forwards("test_author", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
create_book.state_forwards("test_book", new_state)
create_book.database_forwards("test_book", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
fill_data.state_forwards("fill_data", new_state)
fill_data.database_forwards("fill_data", editor, project_state, new_state)
def _test_autofield_foreignfield_growth(self, source_field, target_field, target_value):
"""
A field may be migrated in the following ways:
- AutoField to BigAutoField
- SmallAutoField to AutoField
- SmallAutoField to BigAutoField
"""
def create_initial_data(models, schema_editor):
Article = models.get_model("test_article", "Article")
Blog = models.get_model("test_blog", "Blog")
blog = Blog.objects.create(name="web development done right")
Article.objects.create(name="Frameworks", blog=blog)
Article.objects.create(name="Programming Languages", blog=blog)
def create_big_data(models, schema_editor):
Article = models.get_model("test_article", "Article")
Blog = models.get_model("test_blog", "Blog")
blog2 = Blog.objects.create(name="Frameworks", id=target_value)
Article.objects.create(name="Django", blog=blog2)
Article.objects.create(id=target_value, name="Django2", blog=blog2)
create_blog = migrations.CreateModel(
"Blog",
[
("id", source_field(primary_key=True)),
("name", models.CharField(max_length=100)),
],
options={},
)
create_article = migrations.CreateModel(
"Article",
[
("id", source_field(primary_key=True)),
("blog", models.ForeignKey(to="test_blog.Blog", on_delete=models.CASCADE)),
("name", models.CharField(max_length=100)),
("data", models.TextField(default="")),
],
options={},
)
fill_initial_data = migrations.RunPython(create_initial_data, create_initial_data)
fill_big_data = migrations.RunPython(create_big_data, create_big_data)
grow_article_id = migrations.AlterField('Article', 'id', target_field(primary_key=True))
grow_blog_id = migrations.AlterField('Blog', 'id', target_field(primary_key=True))
project_state = ProjectState()
new_state = project_state.clone()
with connection.schema_editor() as editor:
create_blog.state_forwards("test_blog", new_state)
create_blog.database_forwards("test_blog", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
create_article.state_forwards("test_article", new_state)
create_article.database_forwards("test_article", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
fill_initial_data.state_forwards("fill_initial_data", new_state)
fill_initial_data.database_forwards("fill_initial_data", editor, project_state, new_state)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
grow_article_id.state_forwards("test_article", new_state)
grow_article_id.database_forwards("test_article", editor, project_state, new_state)
state = new_state.clone()
article = state.apps.get_model("test_article.Article")
self.assertIsInstance(article._meta.pk, target_field)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
grow_blog_id.state_forwards("test_blog", new_state)
grow_blog_id.database_forwards("test_blog", editor, project_state, new_state)
state = new_state.clone()
blog = state.apps.get_model("test_blog.Blog")
self.assertIsInstance(blog._meta.pk, target_field)
project_state = new_state
new_state = new_state.clone()
with connection.schema_editor() as editor:
fill_big_data.state_forwards("fill_big_data", new_state)
fill_big_data.database_forwards("fill_big_data", editor, project_state, new_state)
def test_autofield__bigautofield_foreignfield_growth(self):
"""A field may be migrated from AutoField to BigAutoField."""
self._test_autofield_foreignfield_growth(
models.AutoField,
models.BigAutoField,
2 ** 33,
)
def test_smallfield_autofield_foreignfield_growth(self):
"""A field may be migrated from SmallAutoField to AutoField."""
self._test_autofield_foreignfield_growth(
models.SmallAutoField,
models.AutoField,
2 ** 22,
)
def test_smallfield_bigautofield_foreignfield_growth(self):
"""A field may be migrated from SmallAutoField to BigAutoField."""
self._test_autofield_foreignfield_growth(
models.SmallAutoField,
models.BigAutoField,
2 ** 33,
)
def test_run_python_noop(self):
"""
#24098 - Tests no-op RunPython operations.
"""
project_state = ProjectState()
new_state = project_state.clone()
operation = migrations.RunPython(migrations.RunPython.noop, migrations.RunPython.noop)
with connection.schema_editor() as editor:
operation.database_forwards("test_runpython", editor, project_state, new_state)
operation.database_backwards("test_runpython", editor, new_state, project_state)
def test_separate_database_and_state(self):
"""
Tests the SeparateDatabaseAndState operation.
"""
project_state = self.set_up_test_model("test_separatedatabaseandstate")
# Create the operation
database_operation = migrations.RunSQL(
"CREATE TABLE i_love_ponies (id int, special_thing int);",
"DROP TABLE i_love_ponies;"
)
state_operation = migrations.CreateModel("SomethingElse", [("id", models.AutoField(primary_key=True))])
operation = migrations.SeparateDatabaseAndState(
state_operations=[state_operation],
database_operations=[database_operation]
)
self.assertEqual(operation.describe(), "Custom state/database change combination")
# Test the state alteration
new_state = project_state.clone()
operation.state_forwards("test_separatedatabaseandstate", new_state)
self.assertEqual(len(new_state.models["test_separatedatabaseandstate", "somethingelse"].fields), 1)
# Make sure there's no table
self.assertTableNotExists("i_love_ponies")
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards("test_separatedatabaseandstate", editor, project_state, new_state)
self.assertTableExists("i_love_ponies")
# And test reversal
self.assertTrue(operation.reversible)
with connection.schema_editor() as editor:
operation.database_backwards("test_separatedatabaseandstate", editor, new_state, project_state)
self.assertTableNotExists("i_love_ponies")
# And deconstruction
definition = operation.deconstruct()
self.assertEqual(definition[0], "SeparateDatabaseAndState")
self.assertEqual(definition[1], [])
self.assertEqual(sorted(definition[2]), ["database_operations", "state_operations"])
def test_separate_database_and_state2(self):
"""
A complex SeparateDatabaseAndState operation: Multiple operations both
for state and database. Verify the state dependencies within each list
and that state ops don't affect the database.
"""
app_label = "test_separatedatabaseandstate2"
project_state = self.set_up_test_model(app_label)
# Create the operation
database_operations = [
migrations.CreateModel(
"ILovePonies",
[("id", models.AutoField(primary_key=True))],
options={"db_table": "iloveponies"},
),
migrations.CreateModel(
"ILoveMorePonies",
# We use IntegerField and not AutoField because
# the model is going to be deleted immediately
# and with an AutoField this fails on Oracle
[("id", models.IntegerField(primary_key=True))],
options={"db_table": "ilovemoreponies"},
),
migrations.DeleteModel("ILoveMorePonies"),
migrations.CreateModel(
"ILoveEvenMorePonies",
[("id", models.AutoField(primary_key=True))],
options={"db_table": "iloveevenmoreponies"},
),
]
state_operations = [
migrations.CreateModel(
"SomethingElse",
[("id", models.AutoField(primary_key=True))],
options={"db_table": "somethingelse"},
),
migrations.DeleteModel("SomethingElse"),
migrations.CreateModel(
"SomethingCompletelyDifferent",
[("id", models.AutoField(primary_key=True))],
options={"db_table": "somethingcompletelydifferent"},
),
]
operation = migrations.SeparateDatabaseAndState(
state_operations=state_operations,
database_operations=database_operations,
)
# Test the state alteration
new_state = project_state.clone()
operation.state_forwards(app_label, new_state)
def assertModelsAndTables(after_db):
# Tables and models exist, or don't, as they should:
self.assertNotIn((app_label, "somethingelse"), new_state.models)
self.assertEqual(len(new_state.models[app_label, "somethingcompletelydifferent"].fields), 1)
self.assertNotIn((app_label, "iloveponiesonies"), new_state.models)
self.assertNotIn((app_label, "ilovemoreponies"), new_state.models)
self.assertNotIn((app_label, "iloveevenmoreponies"), new_state.models)
self.assertTableNotExists("somethingelse")
self.assertTableNotExists("somethingcompletelydifferent")
self.assertTableNotExists("ilovemoreponies")
if after_db:
self.assertTableExists("iloveponies")
self.assertTableExists("iloveevenmoreponies")
else:
self.assertTableNotExists("iloveponies")
self.assertTableNotExists("iloveevenmoreponies")
assertModelsAndTables(after_db=False)
# Test the database alteration
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, project_state, new_state)
assertModelsAndTables(after_db=True)
# And test reversal
self.assertTrue(operation.reversible)
with connection.schema_editor() as editor:
operation.database_backwards(app_label, editor, new_state, project_state)
assertModelsAndTables(after_db=False)
class SwappableOperationTests(OperationTestBase):
"""
Key operations ignore swappable models
(we don't want to replicate all of them here, as the functionality
is in a common base class anyway)
"""
available_apps = ['migrations']
@override_settings(TEST_SWAP_MODEL="migrations.SomeFakeModel")
def test_create_ignore_swapped(self):
"""
The CreateTable operation ignores swapped models.
"""
operation = migrations.CreateModel(
"Pony",
[
("id", models.AutoField(primary_key=True)),
("pink", models.IntegerField(default=1)),
],
options={
"swappable": "TEST_SWAP_MODEL",
},
)
# Test the state alteration (it should still be there!)
project_state = ProjectState()
new_state = project_state.clone()
operation.state_forwards("test_crigsw", new_state)
self.assertEqual(new_state.models["test_crigsw", "pony"].name, "Pony")
self.assertEqual(len(new_state.models["test_crigsw", "pony"].fields), 2)
# Test the database alteration
self.assertTableNotExists("test_crigsw_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_crigsw", editor, project_state, new_state)
self.assertTableNotExists("test_crigsw_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_crigsw", editor, new_state, project_state)
self.assertTableNotExists("test_crigsw_pony")
@override_settings(TEST_SWAP_MODEL="migrations.SomeFakeModel")
def test_delete_ignore_swapped(self):
"""
Tests the DeleteModel operation ignores swapped models.
"""
operation = migrations.DeleteModel("Pony")
project_state, new_state = self.make_test_state("test_dligsw", operation)
# Test the database alteration
self.assertTableNotExists("test_dligsw_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_dligsw", editor, project_state, new_state)
self.assertTableNotExists("test_dligsw_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_dligsw", editor, new_state, project_state)
self.assertTableNotExists("test_dligsw_pony")
@override_settings(TEST_SWAP_MODEL="migrations.SomeFakeModel")
def test_add_field_ignore_swapped(self):
"""
Tests the AddField operation.
"""
# Test the state alteration
operation = migrations.AddField(
"Pony",
"height",
models.FloatField(null=True, default=5),
)
project_state, new_state = self.make_test_state("test_adfligsw", operation)
# Test the database alteration
self.assertTableNotExists("test_adfligsw_pony")
with connection.schema_editor() as editor:
operation.database_forwards("test_adfligsw", editor, project_state, new_state)
self.assertTableNotExists("test_adfligsw_pony")
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_adfligsw", editor, new_state, project_state)
self.assertTableNotExists("test_adfligsw_pony")
@override_settings(TEST_SWAP_MODEL='migrations.SomeFakeModel')
def test_indexes_ignore_swapped(self):
"""
Add/RemoveIndex operations ignore swapped models.
"""
operation = migrations.AddIndex('Pony', models.Index(fields=['pink'], name='my_name_idx'))
project_state, new_state = self.make_test_state('test_adinigsw', operation)
with connection.schema_editor() as editor:
# No database queries should be run for swapped models
operation.database_forwards('test_adinigsw', editor, project_state, new_state)
operation.database_backwards('test_adinigsw', editor, new_state, project_state)
operation = migrations.RemoveIndex('Pony', models.Index(fields=['pink'], name='my_name_idx'))
project_state, new_state = self.make_test_state("test_rminigsw", operation)
with connection.schema_editor() as editor:
operation.database_forwards('test_rminigsw', editor, project_state, new_state)
operation.database_backwards('test_rminigsw', editor, new_state, project_state)
class TestCreateModel(SimpleTestCase):
def test_references_model_mixin(self):
CreateModel('name', [], bases=(Mixin, models.Model)).references_model('other_model')
class FieldOperationTests(SimpleTestCase):
def test_references_model(self):
operation = FieldOperation('MoDel', 'field', models.ForeignKey('Other', models.CASCADE))
# Model name match.
self.assertIs(operation.references_model('mOdEl'), True)
# Referenced field.
self.assertIs(operation.references_model('oTher'), True)
# Doesn't reference.
self.assertIs(operation.references_model('Whatever'), False)
def test_references_field_by_name(self):
operation = FieldOperation('MoDel', 'field', models.BooleanField(default=False))
self.assertIs(operation.references_field('model', 'field'), True)
def test_references_field_by_remote_field_model(self):
operation = FieldOperation('Model', 'field', models.ForeignKey('Other', models.CASCADE))
self.assertIs(operation.references_field('Other', 'whatever'), True)
self.assertIs(operation.references_field('Missing', 'whatever'), False)
def test_references_field_by_from_fields(self):
operation = FieldOperation(
'Model', 'field', models.fields.related.ForeignObject('Other', models.CASCADE, ['from'], ['to'])
)
self.assertIs(operation.references_field('Model', 'from'), True)
self.assertIs(operation.references_field('Model', 'to'), False)
self.assertIs(operation.references_field('Other', 'from'), False)
self.assertIs(operation.references_field('Model', 'to'), False)
def test_references_field_by_to_fields(self):
operation = FieldOperation('Model', 'field', models.ForeignKey('Other', models.CASCADE, to_field='field'))
self.assertIs(operation.references_field('Other', 'field'), True)
self.assertIs(operation.references_field('Other', 'whatever'), False)
self.assertIs(operation.references_field('Missing', 'whatever'), False)
def test_references_field_by_through(self):
operation = FieldOperation('Model', 'field', models.ManyToManyField('Other', through='Through'))
self.assertIs(operation.references_field('Other', 'whatever'), True)
self.assertIs(operation.references_field('Through', 'whatever'), True)
self.assertIs(operation.references_field('Missing', 'whatever'), False)
def test_reference_field_by_through_fields(self):
operation = FieldOperation(
'Model', 'field', models.ManyToManyField('Other', through='Through', through_fields=('first', 'second'))
)
self.assertIs(operation.references_field('Other', 'whatever'), True)
self.assertIs(operation.references_field('Through', 'whatever'), False)
self.assertIs(operation.references_field('Through', 'first'), True)
self.assertIs(operation.references_field('Through', 'second'), True)
|
969def4b56e37cee98f92459371ca3c82ee5c50d57c627368e5ecbb156e62875 | import os
import shutil
import tempfile
from contextlib import contextmanager
from importlib import import_module
from django.apps import apps
from django.db import connection, connections, migrations, models
from django.db.migrations.migration import Migration
from django.db.migrations.recorder import MigrationRecorder
from django.db.migrations.state import ProjectState
from django.test import TransactionTestCase
from django.test.utils import extend_sys_path
from django.utils.module_loading import module_dir
class MigrationTestBase(TransactionTestCase):
"""
Contains an extended set of asserts for testing migrations and schema operations.
"""
available_apps = ["migrations"]
databases = {'default', 'other'}
def tearDown(self):
# Reset applied-migrations state.
for db in self.databases:
recorder = MigrationRecorder(connections[db])
recorder.migration_qs.filter(app='migrations').delete()
def get_table_description(self, table, using='default'):
with connections[using].cursor() as cursor:
return connections[using].introspection.get_table_description(cursor, table)
def assertTableExists(self, table, using='default'):
with connections[using].cursor() as cursor:
self.assertIn(table, connections[using].introspection.table_names(cursor))
def assertTableNotExists(self, table, using='default'):
with connections[using].cursor() as cursor:
self.assertNotIn(table, connections[using].introspection.table_names(cursor))
def assertColumnExists(self, table, column, using='default'):
self.assertIn(column, [c.name for c in self.get_table_description(table, using=using)])
def assertColumnNotExists(self, table, column, using='default'):
self.assertNotIn(column, [c.name for c in self.get_table_description(table, using=using)])
def _get_column_allows_null(self, table, column, using):
return [c.null_ok for c in self.get_table_description(table, using=using) if c.name == column][0]
def assertColumnNull(self, table, column, using='default'):
self.assertTrue(self._get_column_allows_null(table, column, using))
def assertColumnNotNull(self, table, column, using='default'):
self.assertFalse(self._get_column_allows_null(table, column, using))
def assertIndexExists(self, table, columns, value=True, using='default', index_type=None):
with connections[using].cursor() as cursor:
self.assertEqual(
value,
any(
c["index"]
for c in connections[using].introspection.get_constraints(cursor, table).values()
if c['columns'] == list(columns) and (index_type is None or c['type'] == index_type)
),
)
def assertIndexNotExists(self, table, columns):
return self.assertIndexExists(table, columns, False)
def assertConstraintExists(self, table, name, value=True, using='default'):
with connections[using].cursor() as cursor:
constraints = connections[using].introspection.get_constraints(cursor, table).items()
self.assertEqual(
value,
any(c['check'] for n, c in constraints if n == name),
)
def assertConstraintNotExists(self, table, name):
return self.assertConstraintExists(table, name, False)
def assertFKExists(self, table, columns, to, value=True, using='default'):
with connections[using].cursor() as cursor:
self.assertEqual(
value,
any(
c["foreign_key"] == to
for c in connections[using].introspection.get_constraints(cursor, table).values()
if c['columns'] == list(columns)
),
)
def assertFKNotExists(self, table, columns, to):
return self.assertFKExists(table, columns, to, False)
@contextmanager
def temporary_migration_module(self, app_label='migrations', module=None):
"""
Allows testing management commands in a temporary migrations module.
Wrap all invocations to makemigrations and squashmigrations with this
context manager in order to avoid creating migration files in your
source tree inadvertently.
Takes the application label that will be passed to makemigrations or
squashmigrations and the Python path to a migrations module.
The migrations module is used as a template for creating the temporary
migrations module. If it isn't provided, the application's migrations
module is used, if it exists.
Returns the filesystem path to the temporary migrations module.
"""
with tempfile.TemporaryDirectory() as temp_dir:
target_dir = tempfile.mkdtemp(dir=temp_dir)
with open(os.path.join(target_dir, '__init__.py'), 'w'):
pass
target_migrations_dir = os.path.join(target_dir, 'migrations')
if module is None:
module = apps.get_app_config(app_label).name + '.migrations'
try:
source_migrations_dir = module_dir(import_module(module))
except (ImportError, ValueError):
pass
else:
shutil.copytree(source_migrations_dir, target_migrations_dir)
with extend_sys_path(temp_dir):
new_module = os.path.basename(target_dir) + '.migrations'
with self.settings(MIGRATION_MODULES={app_label: new_module}):
yield target_migrations_dir
class OperationTestBase(MigrationTestBase):
"""Common functions to help test operations."""
@classmethod
def setUpClass(cls):
super().setUpClass()
cls._initial_table_names = frozenset(connection.introspection.table_names())
def tearDown(self):
self.cleanup_test_tables()
super().tearDown()
def cleanup_test_tables(self):
table_names = frozenset(connection.introspection.table_names()) - self._initial_table_names
with connection.schema_editor() as editor:
with connection.constraint_checks_disabled():
for table_name in table_names:
editor.execute(editor.sql_delete_table % {
'table': editor.quote_name(table_name),
})
def apply_operations(self, app_label, project_state, operations, atomic=True):
migration = Migration('name', app_label)
migration.operations = operations
with connection.schema_editor(atomic=atomic) as editor:
return migration.apply(project_state, editor)
def unapply_operations(self, app_label, project_state, operations, atomic=True):
migration = Migration('name', app_label)
migration.operations = operations
with connection.schema_editor(atomic=atomic) as editor:
return migration.unapply(project_state, editor)
def make_test_state(self, app_label, operation, **kwargs):
"""
Makes a test state using set_up_test_model and returns the
original state and the state after the migration is applied.
"""
project_state = self.set_up_test_model(app_label, **kwargs)
new_state = project_state.clone()
operation.state_forwards(app_label, new_state)
return project_state, new_state
def set_up_test_model(
self, app_label, second_model=False, third_model=False, index=False,
multicol_index=False, related_model=False, mti_model=False,
proxy_model=False, manager_model=False, unique_together=False,
options=False, db_table=None, index_together=False, constraints=None,
):
"""Creates a test model state and database table."""
# Make the "current" state.
model_options = {
'swappable': 'TEST_SWAP_MODEL',
'index_together': [['weight', 'pink']] if index_together else [],
'unique_together': [['pink', 'weight']] if unique_together else [],
}
if options:
model_options['permissions'] = [('can_groom', 'Can groom')]
if db_table:
model_options['db_table'] = db_table
operations = [migrations.CreateModel(
'Pony',
[
('id', models.AutoField(primary_key=True)),
('pink', models.IntegerField(default=3)),
('weight', models.FloatField()),
],
options=model_options,
)]
if index:
operations.append(migrations.AddIndex(
'Pony',
models.Index(fields=['pink'], name='pony_pink_idx'),
))
if multicol_index:
operations.append(migrations.AddIndex(
'Pony',
models.Index(fields=['pink', 'weight'], name='pony_test_idx'),
))
if constraints:
for constraint in constraints:
operations.append(migrations.AddConstraint('Pony', constraint))
if second_model:
operations.append(migrations.CreateModel(
'Stable',
[
('id', models.AutoField(primary_key=True)),
]
))
if third_model:
operations.append(migrations.CreateModel(
'Van',
[
('id', models.AutoField(primary_key=True)),
]
))
if related_model:
operations.append(migrations.CreateModel(
'Rider',
[
('id', models.AutoField(primary_key=True)),
('pony', models.ForeignKey('Pony', models.CASCADE)),
('friend', models.ForeignKey('self', models.CASCADE))
],
))
if mti_model:
operations.append(migrations.CreateModel(
'ShetlandPony',
fields=[
('pony_ptr', models.OneToOneField(
'Pony',
models.CASCADE,
auto_created=True,
parent_link=True,
primary_key=True,
to_field='id',
serialize=False,
)),
('cuteness', models.IntegerField(default=1)),
],
bases=['%s.Pony' % app_label],
))
if proxy_model:
operations.append(migrations.CreateModel(
'ProxyPony',
fields=[],
options={'proxy': True},
bases=['%s.Pony' % app_label],
))
if manager_model:
from .models import FoodManager, FoodQuerySet
operations.append(migrations.CreateModel(
'Food',
fields=[
('id', models.AutoField(primary_key=True)),
],
managers=[
('food_qs', FoodQuerySet.as_manager()),
('food_mgr', FoodManager('a', 'b')),
('food_mgr_kwargs', FoodManager('x', 'y', 3, 4)),
]
))
return self.apply_operations(app_label, ProjectState(), operations)
|
ee5d644238a6134079cc4c02c432e05337ef77f6dbf48e202f8162103bfbfd24 | from django.apps.registry import Apps
from django.contrib.contenttypes.fields import GenericForeignKey
from django.db import models
from django.db.migrations.exceptions import InvalidBasesError
from django.db.migrations.operations import (
AddField, AlterField, DeleteModel, RemoveField,
)
from django.db.migrations.state import (
ModelState, ProjectState, get_related_models_recursive,
)
from django.test import SimpleTestCase, override_settings
from django.test.utils import isolate_apps
from .models import (
FoodManager, FoodQuerySet, ModelWithCustomBase, NoMigrationFoodManager,
UnicodeModel,
)
class StateTests(SimpleTestCase):
"""
Tests state construction, rendering and modification by operations.
"""
def test_create(self):
"""
Tests making a ProjectState from an Apps
"""
new_apps = Apps(["migrations"])
class Author(models.Model):
name = models.CharField(max_length=255)
bio = models.TextField()
age = models.IntegerField(blank=True, null=True)
class Meta:
app_label = "migrations"
apps = new_apps
unique_together = ["name", "bio"]
index_together = ["bio", "age"]
class AuthorProxy(Author):
class Meta:
app_label = "migrations"
apps = new_apps
proxy = True
ordering = ["name"]
class SubAuthor(Author):
width = models.FloatField(null=True)
class Meta:
app_label = "migrations"
apps = new_apps
class Book(models.Model):
title = models.CharField(max_length=1000)
author = models.ForeignKey(Author, models.CASCADE)
contributors = models.ManyToManyField(Author)
class Meta:
app_label = "migrations"
apps = new_apps
verbose_name = "tome"
db_table = "test_tome"
indexes = [models.Index(fields=['title'])]
class Food(models.Model):
food_mgr = FoodManager('a', 'b')
food_qs = FoodQuerySet.as_manager()
food_no_mgr = NoMigrationFoodManager('x', 'y')
class Meta:
app_label = "migrations"
apps = new_apps
class FoodNoManagers(models.Model):
class Meta:
app_label = "migrations"
apps = new_apps
class FoodNoDefaultManager(models.Model):
food_no_mgr = NoMigrationFoodManager('x', 'y')
food_mgr = FoodManager('a', 'b')
food_qs = FoodQuerySet.as_manager()
class Meta:
app_label = "migrations"
apps = new_apps
mgr1 = FoodManager('a', 'b')
mgr2 = FoodManager('x', 'y', c=3, d=4)
class FoodOrderedManagers(models.Model):
# The managers on this model should be ordered by their creation
# counter and not by the order in model body
food_no_mgr = NoMigrationFoodManager('x', 'y')
food_mgr2 = mgr2
food_mgr1 = mgr1
class Meta:
app_label = "migrations"
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models['migrations', 'author']
author_proxy_state = project_state.models['migrations', 'authorproxy']
sub_author_state = project_state.models['migrations', 'subauthor']
book_state = project_state.models['migrations', 'book']
food_state = project_state.models['migrations', 'food']
food_no_managers_state = project_state.models['migrations', 'foodnomanagers']
food_no_default_manager_state = project_state.models['migrations', 'foodnodefaultmanager']
food_order_manager_state = project_state.models['migrations', 'foodorderedmanagers']
book_index = models.Index(fields=['title'])
book_index.set_name_with_model(Book)
self.assertEqual(author_state.app_label, "migrations")
self.assertEqual(author_state.name, "Author")
self.assertEqual([x for x, y in author_state.fields], ["id", "name", "bio", "age"])
self.assertEqual(author_state.fields[1][1].max_length, 255)
self.assertIs(author_state.fields[2][1].null, False)
self.assertIs(author_state.fields[3][1].null, True)
self.assertEqual(
author_state.options,
{
"unique_together": {("name", "bio")},
"index_together": {("bio", "age")},
"indexes": [],
"constraints": [],
}
)
self.assertEqual(author_state.bases, (models.Model,))
self.assertEqual(book_state.app_label, "migrations")
self.assertEqual(book_state.name, "Book")
self.assertEqual([x for x, y in book_state.fields], ["id", "title", "author", "contributors"])
self.assertEqual(book_state.fields[1][1].max_length, 1000)
self.assertIs(book_state.fields[2][1].null, False)
self.assertEqual(book_state.fields[3][1].__class__.__name__, "ManyToManyField")
self.assertEqual(
book_state.options,
{"verbose_name": "tome", "db_table": "test_tome", "indexes": [book_index], "constraints": []},
)
self.assertEqual(book_state.bases, (models.Model,))
self.assertEqual(author_proxy_state.app_label, "migrations")
self.assertEqual(author_proxy_state.name, "AuthorProxy")
self.assertEqual(author_proxy_state.fields, [])
self.assertEqual(
author_proxy_state.options,
{"proxy": True, "ordering": ["name"], "indexes": [], "constraints": []},
)
self.assertEqual(author_proxy_state.bases, ("migrations.author",))
self.assertEqual(sub_author_state.app_label, "migrations")
self.assertEqual(sub_author_state.name, "SubAuthor")
self.assertEqual(len(sub_author_state.fields), 2)
self.assertEqual(sub_author_state.bases, ("migrations.author",))
# The default manager is used in migrations
self.assertEqual([name for name, mgr in food_state.managers], ['food_mgr'])
self.assertTrue(all(isinstance(name, str) for name, mgr in food_state.managers))
self.assertEqual(food_state.managers[0][1].args, ('a', 'b', 1, 2))
# No explicit managers defined. Migrations will fall back to the default
self.assertEqual(food_no_managers_state.managers, [])
# food_mgr is used in migration but isn't the default mgr, hence add the
# default
self.assertEqual([name for name, mgr in food_no_default_manager_state.managers],
['food_no_mgr', 'food_mgr'])
self.assertTrue(all(isinstance(name, str) for name, mgr in food_no_default_manager_state.managers))
self.assertEqual(food_no_default_manager_state.managers[0][1].__class__, models.Manager)
self.assertIsInstance(food_no_default_manager_state.managers[1][1], FoodManager)
self.assertEqual([name for name, mgr in food_order_manager_state.managers],
['food_mgr1', 'food_mgr2'])
self.assertTrue(all(isinstance(name, str) for name, mgr in food_order_manager_state.managers))
self.assertEqual([mgr.args for name, mgr in food_order_manager_state.managers],
[('a', 'b', 1, 2), ('x', 'y', 3, 4)])
def test_custom_default_manager_added_to_the_model_state(self):
"""
When the default manager of the model is a custom manager,
it needs to be added to the model state.
"""
new_apps = Apps(['migrations'])
custom_manager = models.Manager()
class Author(models.Model):
objects = models.TextField()
authors = custom_manager
class Meta:
app_label = 'migrations'
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models['migrations', 'author']
self.assertEqual(author_state.managers, [('authors', custom_manager)])
def test_custom_default_manager_named_objects_with_false_migration_flag(self):
"""
When a manager is added with a name of 'objects' but it does not
have `use_in_migrations = True`, no migration should be added to the
model state (#26643).
"""
new_apps = Apps(['migrations'])
class Author(models.Model):
objects = models.Manager()
class Meta:
app_label = 'migrations'
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models['migrations', 'author']
self.assertEqual(author_state.managers, [])
def test_no_duplicate_managers(self):
"""
When a manager is added with `use_in_migrations = True` and a parent
model had a manager with the same name and `use_in_migrations = True`,
the parent's manager shouldn't appear in the model state (#26881).
"""
new_apps = Apps(['migrations'])
class PersonManager(models.Manager):
use_in_migrations = True
class Person(models.Model):
objects = PersonManager()
class Meta:
abstract = True
class BossManager(PersonManager):
use_in_migrations = True
class Boss(Person):
objects = BossManager()
class Meta:
app_label = 'migrations'
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
boss_state = project_state.models['migrations', 'boss']
self.assertEqual(boss_state.managers, [('objects', Boss.objects)])
def test_custom_default_manager(self):
new_apps = Apps(['migrations'])
class Author(models.Model):
manager1 = models.Manager()
manager2 = models.Manager()
class Meta:
app_label = 'migrations'
apps = new_apps
default_manager_name = 'manager2'
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models['migrations', 'author']
self.assertEqual(author_state.options['default_manager_name'], 'manager2')
self.assertEqual(author_state.managers, [('manager2', Author.manager1)])
def test_custom_base_manager(self):
new_apps = Apps(['migrations'])
class Author(models.Model):
manager1 = models.Manager()
manager2 = models.Manager()
class Meta:
app_label = 'migrations'
apps = new_apps
base_manager_name = 'manager2'
class Author2(models.Model):
manager1 = models.Manager()
manager2 = models.Manager()
class Meta:
app_label = 'migrations'
apps = new_apps
base_manager_name = 'manager1'
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models['migrations', 'author']
self.assertEqual(author_state.options['base_manager_name'], 'manager2')
self.assertEqual(author_state.managers, [
('manager1', Author.manager1),
('manager2', Author.manager2),
])
author2_state = project_state.models['migrations', 'author2']
self.assertEqual(author2_state.options['base_manager_name'], 'manager1')
self.assertEqual(author2_state.managers, [
('manager1', Author2.manager1),
])
def test_apps_bulk_update(self):
"""
StateApps.bulk_update() should update apps.ready to False and reset
the value afterwards.
"""
project_state = ProjectState()
apps = project_state.apps
with apps.bulk_update():
self.assertFalse(apps.ready)
self.assertTrue(apps.ready)
with self.assertRaises(ValueError):
with apps.bulk_update():
self.assertFalse(apps.ready)
raise ValueError()
self.assertTrue(apps.ready)
def test_render(self):
"""
Tests rendering a ProjectState into an Apps.
"""
project_state = ProjectState()
project_state.add_model(ModelState(
app_label="migrations",
name="Tag",
fields=[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
("hidden", models.BooleanField()),
],
))
project_state.add_model(ModelState(
app_label="migrations",
name="SubTag",
fields=[
('tag_ptr', models.OneToOneField(
'migrations.Tag',
models.CASCADE,
auto_created=True,
parent_link=True,
primary_key=True,
to_field='id',
serialize=False,
)),
("awesome", models.BooleanField()),
],
bases=("migrations.Tag",),
))
base_mgr = models.Manager()
mgr1 = FoodManager('a', 'b')
mgr2 = FoodManager('x', 'y', c=3, d=4)
project_state.add_model(ModelState(
app_label="migrations",
name="Food",
fields=[
("id", models.AutoField(primary_key=True)),
],
managers=[
# The ordering we really want is objects, mgr1, mgr2
('default', base_mgr),
('food_mgr2', mgr2),
('food_mgr1', mgr1),
]
))
new_apps = project_state.apps
self.assertEqual(new_apps.get_model("migrations", "Tag")._meta.get_field("name").max_length, 100)
self.assertIs(new_apps.get_model("migrations", "Tag")._meta.get_field("hidden").null, False)
self.assertEqual(len(new_apps.get_model("migrations", "SubTag")._meta.local_fields), 2)
Food = new_apps.get_model("migrations", "Food")
self.assertEqual([mgr.name for mgr in Food._meta.managers],
['default', 'food_mgr1', 'food_mgr2'])
self.assertTrue(all(isinstance(mgr.name, str) for mgr in Food._meta.managers))
self.assertEqual([mgr.__class__ for mgr in Food._meta.managers],
[models.Manager, FoodManager, FoodManager])
def test_render_model_inheritance(self):
class Book(models.Model):
title = models.CharField(max_length=1000)
class Meta:
app_label = "migrations"
apps = Apps()
class Novel(Book):
class Meta:
app_label = "migrations"
apps = Apps()
# First, test rendering individually
apps = Apps(["migrations"])
# We shouldn't be able to render yet
ms = ModelState.from_model(Novel)
with self.assertRaises(InvalidBasesError):
ms.render(apps)
# Once the parent model is in the app registry, it should be fine
ModelState.from_model(Book).render(apps)
ModelState.from_model(Novel).render(apps)
def test_render_model_with_multiple_inheritance(self):
class Foo(models.Model):
class Meta:
app_label = "migrations"
apps = Apps()
class Bar(models.Model):
class Meta:
app_label = "migrations"
apps = Apps()
class FooBar(Foo, Bar):
class Meta:
app_label = "migrations"
apps = Apps()
class AbstractSubFooBar(FooBar):
class Meta:
abstract = True
apps = Apps()
class SubFooBar(AbstractSubFooBar):
class Meta:
app_label = "migrations"
apps = Apps()
apps = Apps(["migrations"])
# We shouldn't be able to render yet
ms = ModelState.from_model(FooBar)
with self.assertRaises(InvalidBasesError):
ms.render(apps)
# Once the parent models are in the app registry, it should be fine
ModelState.from_model(Foo).render(apps)
self.assertSequenceEqual(ModelState.from_model(Foo).bases, [models.Model])
ModelState.from_model(Bar).render(apps)
self.assertSequenceEqual(ModelState.from_model(Bar).bases, [models.Model])
ModelState.from_model(FooBar).render(apps)
self.assertSequenceEqual(ModelState.from_model(FooBar).bases, ['migrations.foo', 'migrations.bar'])
ModelState.from_model(SubFooBar).render(apps)
self.assertSequenceEqual(ModelState.from_model(SubFooBar).bases, ['migrations.foobar'])
def test_render_project_dependencies(self):
"""
The ProjectState render method correctly renders models
to account for inter-model base dependencies.
"""
new_apps = Apps()
class A(models.Model):
class Meta:
app_label = "migrations"
apps = new_apps
class B(A):
class Meta:
app_label = "migrations"
apps = new_apps
class C(B):
class Meta:
app_label = "migrations"
apps = new_apps
class D(A):
class Meta:
app_label = "migrations"
apps = new_apps
class E(B):
class Meta:
app_label = "migrations"
apps = new_apps
proxy = True
class F(D):
class Meta:
app_label = "migrations"
apps = new_apps
proxy = True
# Make a ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
project_state.add_model(ModelState.from_model(C))
project_state.add_model(ModelState.from_model(D))
project_state.add_model(ModelState.from_model(E))
project_state.add_model(ModelState.from_model(F))
final_apps = project_state.apps
self.assertEqual(len(final_apps.get_models()), 6)
# Now make an invalid ProjectState and make sure it fails
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
project_state.add_model(ModelState.from_model(C))
project_state.add_model(ModelState.from_model(F))
with self.assertRaises(InvalidBasesError):
project_state.apps
def test_render_unique_app_labels(self):
"""
The ProjectState render method doesn't raise an
ImproperlyConfigured exception about unique labels if two dotted app
names have the same last part.
"""
class A(models.Model):
class Meta:
app_label = "django.contrib.auth"
class B(models.Model):
class Meta:
app_label = "vendor.auth"
# Make a ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
self.assertEqual(len(project_state.apps.get_models()), 2)
def test_add_relations(self):
"""
#24573 - Adding relations to existing models should reload the
referenced models too.
"""
new_apps = Apps()
class A(models.Model):
class Meta:
app_label = 'something'
apps = new_apps
class B(A):
class Meta:
app_label = 'something'
apps = new_apps
class C(models.Model):
class Meta:
app_label = 'something'
apps = new_apps
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
project_state.add_model(ModelState.from_model(C))
project_state.apps # We need to work with rendered models
old_state = project_state.clone()
model_a_old = old_state.apps.get_model('something', 'A')
model_b_old = old_state.apps.get_model('something', 'B')
model_c_old = old_state.apps.get_model('something', 'C')
# The relations between the old models are correct
self.assertIs(model_a_old._meta.get_field('b').related_model, model_b_old)
self.assertIs(model_b_old._meta.get_field('a_ptr').related_model, model_a_old)
operation = AddField('c', 'to_a', models.OneToOneField(
'something.A',
models.CASCADE,
related_name='from_c',
))
operation.state_forwards('something', project_state)
model_a_new = project_state.apps.get_model('something', 'A')
model_b_new = project_state.apps.get_model('something', 'B')
model_c_new = project_state.apps.get_model('something', 'C')
# All models have changed
self.assertIsNot(model_a_old, model_a_new)
self.assertIsNot(model_b_old, model_b_new)
self.assertIsNot(model_c_old, model_c_new)
# The relations between the old models still hold
self.assertIs(model_a_old._meta.get_field('b').related_model, model_b_old)
self.assertIs(model_b_old._meta.get_field('a_ptr').related_model, model_a_old)
# The relations between the new models correct
self.assertIs(model_a_new._meta.get_field('b').related_model, model_b_new)
self.assertIs(model_b_new._meta.get_field('a_ptr').related_model, model_a_new)
self.assertIs(model_a_new._meta.get_field('from_c').related_model, model_c_new)
self.assertIs(model_c_new._meta.get_field('to_a').related_model, model_a_new)
def test_remove_relations(self):
"""
#24225 - Relations between models are updated while
remaining the relations and references for models of an old state.
"""
new_apps = Apps()
class A(models.Model):
class Meta:
app_label = "something"
apps = new_apps
class B(models.Model):
to_a = models.ForeignKey(A, models.CASCADE)
class Meta:
app_label = "something"
apps = new_apps
def get_model_a(state):
return [mod for mod in state.apps.get_models() if mod._meta.model_name == 'a'][0]
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
self.assertEqual(len(get_model_a(project_state)._meta.related_objects), 1)
old_state = project_state.clone()
operation = RemoveField("b", "to_a")
operation.state_forwards("something", project_state)
# Model from old_state still has the relation
model_a_old = get_model_a(old_state)
model_a_new = get_model_a(project_state)
self.assertIsNot(model_a_old, model_a_new)
self.assertEqual(len(model_a_old._meta.related_objects), 1)
self.assertEqual(len(model_a_new._meta.related_objects), 0)
# Same test for deleted model
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
old_state = project_state.clone()
operation = DeleteModel("b")
operation.state_forwards("something", project_state)
model_a_old = get_model_a(old_state)
model_a_new = get_model_a(project_state)
self.assertIsNot(model_a_old, model_a_new)
self.assertEqual(len(model_a_old._meta.related_objects), 1)
self.assertEqual(len(model_a_new._meta.related_objects), 0)
def test_self_relation(self):
"""
#24513 - Modifying an object pointing to itself would cause it to be
rendered twice and thus breaking its related M2M through objects.
"""
class A(models.Model):
to_a = models.ManyToManyField('something.A', symmetrical=False)
class Meta:
app_label = "something"
def get_model_a(state):
return [mod for mod in state.apps.get_models() if mod._meta.model_name == 'a'][0]
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
self.assertEqual(len(get_model_a(project_state)._meta.related_objects), 1)
old_state = project_state.clone()
operation = AlterField(
model_name="a",
name="to_a",
field=models.ManyToManyField("something.A", symmetrical=False, blank=True)
)
# At this point the model would be rendered twice causing its related
# M2M through objects to point to an old copy and thus breaking their
# attribute lookup.
operation.state_forwards("something", project_state)
model_a_old = get_model_a(old_state)
model_a_new = get_model_a(project_state)
self.assertIsNot(model_a_old, model_a_new)
# The old model's _meta is still consistent
field_to_a_old = model_a_old._meta.get_field("to_a")
self.assertEqual(field_to_a_old.m2m_field_name(), "from_a")
self.assertEqual(field_to_a_old.m2m_reverse_field_name(), "to_a")
self.assertIs(field_to_a_old.related_model, model_a_old)
self.assertIs(field_to_a_old.remote_field.through._meta.get_field('to_a').related_model, model_a_old)
self.assertIs(field_to_a_old.remote_field.through._meta.get_field('from_a').related_model, model_a_old)
# The new model's _meta is still consistent
field_to_a_new = model_a_new._meta.get_field("to_a")
self.assertEqual(field_to_a_new.m2m_field_name(), "from_a")
self.assertEqual(field_to_a_new.m2m_reverse_field_name(), "to_a")
self.assertIs(field_to_a_new.related_model, model_a_new)
self.assertIs(field_to_a_new.remote_field.through._meta.get_field('to_a').related_model, model_a_new)
self.assertIs(field_to_a_new.remote_field.through._meta.get_field('from_a').related_model, model_a_new)
def test_equality(self):
"""
== and != are implemented correctly.
"""
# Test two things that should be equal
project_state = ProjectState()
project_state.add_model(ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
("hidden", models.BooleanField()),
],
{},
None,
))
project_state.apps # Fill the apps cached property
other_state = project_state.clone()
self.assertEqual(project_state, project_state)
self.assertEqual(project_state, other_state)
self.assertIs(project_state != project_state, False)
self.assertIs(project_state != other_state, False)
self.assertNotEqual(project_state.apps, other_state.apps)
# Make a very small change (max_len 99) and see if that affects it
project_state = ProjectState()
project_state.add_model(ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=99)),
("hidden", models.BooleanField()),
],
{},
None,
))
self.assertNotEqual(project_state, other_state)
self.assertIs(project_state == other_state, False)
def test_dangling_references_throw_error(self):
new_apps = Apps()
class Author(models.Model):
name = models.TextField()
class Meta:
app_label = "migrations"
apps = new_apps
class Publisher(models.Model):
name = models.TextField()
class Meta:
app_label = "migrations"
apps = new_apps
class Book(models.Model):
author = models.ForeignKey(Author, models.CASCADE)
publisher = models.ForeignKey(Publisher, models.CASCADE)
class Meta:
app_label = "migrations"
apps = new_apps
class Magazine(models.Model):
authors = models.ManyToManyField(Author)
class Meta:
app_label = "migrations"
apps = new_apps
# Make a valid ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Author))
project_state.add_model(ModelState.from_model(Publisher))
project_state.add_model(ModelState.from_model(Book))
project_state.add_model(ModelState.from_model(Magazine))
self.assertEqual(len(project_state.apps.get_models()), 4)
# now make an invalid one with a ForeignKey
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Book))
msg = (
"The field migrations.Book.author was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model 'author'.\n"
"The field migrations.Book.publisher was declared with a lazy reference "
"to 'migrations.publisher', but app 'migrations' doesn't provide model 'publisher'."
)
with self.assertRaisesMessage(ValueError, msg):
project_state.apps
# And another with ManyToManyField.
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Magazine))
msg = (
"The field migrations.Magazine.authors was declared with a lazy reference "
"to 'migrations.author\', but app 'migrations' doesn't provide model 'author'.\n"
"The field migrations.Magazine_authors.author was declared with a lazy reference "
"to \'migrations.author\', but app 'migrations' doesn't provide model 'author'."
)
with self.assertRaisesMessage(ValueError, msg):
project_state.apps
# And now with multiple models and multiple fields.
project_state.add_model(ModelState.from_model(Book))
msg = (
"The field migrations.Book.author was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model 'author'.\n"
"The field migrations.Book.publisher was declared with a lazy reference "
"to 'migrations.publisher', but app 'migrations' doesn't provide model 'publisher'.\n"
"The field migrations.Magazine.authors was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model 'author'.\n"
"The field migrations.Magazine_authors.author was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model 'author'."
)
with self.assertRaisesMessage(ValueError, msg):
project_state.apps
def test_real_apps(self):
"""
Including real apps can resolve dangling FK errors.
This test relies on the fact that contenttypes is always loaded.
"""
new_apps = Apps()
class TestModel(models.Model):
ct = models.ForeignKey("contenttypes.ContentType", models.CASCADE)
class Meta:
app_label = "migrations"
apps = new_apps
# If we just stick it into an empty state it should fail
project_state = ProjectState()
project_state.add_model(ModelState.from_model(TestModel))
with self.assertRaises(ValueError):
project_state.apps
# If we include the real app it should succeed
project_state = ProjectState(real_apps=["contenttypes"])
project_state.add_model(ModelState.from_model(TestModel))
rendered_state = project_state.apps
self.assertEqual(
len([x for x in rendered_state.get_models() if x._meta.app_label == "migrations"]),
1,
)
def test_ignore_order_wrt(self):
"""
Makes sure ProjectState doesn't include OrderWrt fields when
making from existing models.
"""
new_apps = Apps()
class Author(models.Model):
name = models.TextField()
class Meta:
app_label = "migrations"
apps = new_apps
class Book(models.Model):
author = models.ForeignKey(Author, models.CASCADE)
class Meta:
app_label = "migrations"
apps = new_apps
order_with_respect_to = "author"
# Make a valid ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Author))
project_state.add_model(ModelState.from_model(Book))
self.assertEqual(
[name for name, field in project_state.models["migrations", "book"].fields],
["id", "author"],
)
def test_manager_refer_correct_model_version(self):
"""
#24147 - Managers refer to the correct version of a
historical model
"""
project_state = ProjectState()
project_state.add_model(ModelState(
app_label="migrations",
name="Tag",
fields=[
("id", models.AutoField(primary_key=True)),
("hidden", models.BooleanField()),
],
managers=[
('food_mgr', FoodManager('a', 'b')),
('food_qs', FoodQuerySet.as_manager()),
]
))
old_model = project_state.apps.get_model('migrations', 'tag')
new_state = project_state.clone()
operation = RemoveField("tag", "hidden")
operation.state_forwards("migrations", new_state)
new_model = new_state.apps.get_model('migrations', 'tag')
self.assertIsNot(old_model, new_model)
self.assertIs(old_model, old_model.food_mgr.model)
self.assertIs(old_model, old_model.food_qs.model)
self.assertIs(new_model, new_model.food_mgr.model)
self.assertIs(new_model, new_model.food_qs.model)
self.assertIsNot(old_model.food_mgr, new_model.food_mgr)
self.assertIsNot(old_model.food_qs, new_model.food_qs)
self.assertIsNot(old_model.food_mgr.model, new_model.food_mgr.model)
self.assertIsNot(old_model.food_qs.model, new_model.food_qs.model)
def test_choices_iterator(self):
"""
#24483 - ProjectState.from_apps should not destructively consume
Field.choices iterators.
"""
new_apps = Apps(["migrations"])
choices = [('a', 'A'), ('b', 'B')]
class Author(models.Model):
name = models.CharField(max_length=255)
choice = models.CharField(max_length=255, choices=iter(choices))
class Meta:
app_label = "migrations"
apps = new_apps
ProjectState.from_apps(new_apps)
choices_field = Author._meta.get_field('choice')
self.assertEqual(list(choices_field.choices), choices)
class ModelStateTests(SimpleTestCase):
def test_custom_model_base(self):
state = ModelState.from_model(ModelWithCustomBase)
self.assertEqual(state.bases, (models.Model,))
def test_bound_field_sanity_check(self):
field = models.CharField(max_length=1)
field.model = models.Model
with self.assertRaisesMessage(ValueError, 'ModelState.fields cannot be bound to a model - "field" is.'):
ModelState('app', 'Model', [('field', field)])
def test_sanity_check_to(self):
field = models.ForeignKey(UnicodeModel, models.CASCADE)
with self.assertRaisesMessage(
ValueError,
'ModelState.fields cannot refer to a model class - "field.to" does. '
'Use a string reference instead.'
):
ModelState('app', 'Model', [('field', field)])
def test_sanity_check_through(self):
field = models.ManyToManyField('UnicodeModel')
field.remote_field.through = UnicodeModel
with self.assertRaisesMessage(
ValueError,
'ModelState.fields cannot refer to a model class - "field.through" does. '
'Use a string reference instead.'
):
ModelState('app', 'Model', [('field', field)])
def test_sanity_index_name(self):
field = models.IntegerField()
options = {'indexes': [models.Index(fields=['field'])]}
msg = "Indexes passed to ModelState require a name attribute. <Index: fields='field'> doesn't have one."
with self.assertRaisesMessage(ValueError, msg):
ModelState('app', 'Model', [('field', field)], options=options)
def test_fields_immutability(self):
"""
Rendering a model state doesn't alter its internal fields.
"""
apps = Apps()
field = models.CharField(max_length=1)
state = ModelState('app', 'Model', [('name', field)])
Model = state.render(apps)
self.assertNotEqual(Model._meta.get_field('name'), field)
def test_repr(self):
field = models.CharField(max_length=1)
state = ModelState('app', 'Model', [('name', field)], bases=['app.A', 'app.B', 'app.C'])
self.assertEqual(repr(state), "<ModelState: 'app.Model'>")
project_state = ProjectState()
project_state.add_model(state)
with self.assertRaisesMessage(InvalidBasesError, "Cannot resolve bases for [<ModelState: 'app.Model'>]"):
project_state.apps
@override_settings(TEST_SWAPPABLE_MODEL='migrations.SomeFakeModel')
def test_create_swappable(self):
"""
Tests making a ProjectState from an Apps with a swappable model
"""
new_apps = Apps(['migrations'])
class Author(models.Model):
name = models.CharField(max_length=255)
bio = models.TextField()
age = models.IntegerField(blank=True, null=True)
class Meta:
app_label = 'migrations'
apps = new_apps
swappable = 'TEST_SWAPPABLE_MODEL'
author_state = ModelState.from_model(Author)
self.assertEqual(author_state.app_label, 'migrations')
self.assertEqual(author_state.name, 'Author')
self.assertEqual([x for x, y in author_state.fields], ['id', 'name', 'bio', 'age'])
self.assertEqual(author_state.fields[1][1].max_length, 255)
self.assertIs(author_state.fields[2][1].null, False)
self.assertIs(author_state.fields[3][1].null, True)
self.assertEqual(author_state.options, {'swappable': 'TEST_SWAPPABLE_MODEL', 'indexes': [], "constraints": []})
self.assertEqual(author_state.bases, (models.Model,))
self.assertEqual(author_state.managers, [])
@override_settings(TEST_SWAPPABLE_MODEL='migrations.SomeFakeModel')
def test_create_swappable_from_abstract(self):
"""
A swappable model inheriting from a hierarchy:
concrete -> abstract -> concrete.
"""
new_apps = Apps(['migrations'])
class SearchableLocation(models.Model):
keywords = models.CharField(max_length=256)
class Meta:
app_label = 'migrations'
apps = new_apps
class Station(SearchableLocation):
name = models.CharField(max_length=128)
class Meta:
abstract = True
class BusStation(Station):
bus_routes = models.CharField(max_length=128)
inbound = models.BooleanField(default=False)
class Meta(Station.Meta):
app_label = 'migrations'
apps = new_apps
swappable = 'TEST_SWAPPABLE_MODEL'
station_state = ModelState.from_model(BusStation)
self.assertEqual(station_state.app_label, 'migrations')
self.assertEqual(station_state.name, 'BusStation')
self.assertEqual(
[x for x, y in station_state.fields],
['searchablelocation_ptr', 'name', 'bus_routes', 'inbound']
)
self.assertEqual(station_state.fields[1][1].max_length, 128)
self.assertIs(station_state.fields[2][1].null, False)
self.assertEqual(
station_state.options,
{'abstract': False, 'swappable': 'TEST_SWAPPABLE_MODEL', 'indexes': [], 'constraints': []}
)
self.assertEqual(station_state.bases, ('migrations.searchablelocation',))
self.assertEqual(station_state.managers, [])
@override_settings(TEST_SWAPPABLE_MODEL='migrations.SomeFakeModel')
def test_custom_manager_swappable(self):
"""
Tests making a ProjectState from unused models with custom managers
"""
new_apps = Apps(['migrations'])
class Food(models.Model):
food_mgr = FoodManager('a', 'b')
food_qs = FoodQuerySet.as_manager()
food_no_mgr = NoMigrationFoodManager('x', 'y')
class Meta:
app_label = "migrations"
apps = new_apps
swappable = 'TEST_SWAPPABLE_MODEL'
food_state = ModelState.from_model(Food)
# The default manager is used in migrations
self.assertEqual([name for name, mgr in food_state.managers], ['food_mgr'])
self.assertEqual(food_state.managers[0][1].args, ('a', 'b', 1, 2))
@isolate_apps('migrations', 'django.contrib.contenttypes')
def test_order_with_respect_to_private_field(self):
class PrivateFieldModel(models.Model):
content_type = models.ForeignKey('contenttypes.ContentType', models.CASCADE)
object_id = models.PositiveIntegerField()
private = GenericForeignKey()
class Meta:
order_with_respect_to = 'private'
state = ModelState.from_model(PrivateFieldModel)
self.assertNotIn('order_with_respect_to', state.options)
@isolate_apps('migrations')
def test_abstract_model_children_inherit_indexes(self):
class Abstract(models.Model):
name = models.CharField(max_length=50)
class Meta:
app_label = 'migrations'
abstract = True
indexes = [models.Index(fields=['name'])]
class Child1(Abstract):
pass
class Child2(Abstract):
pass
child1_state = ModelState.from_model(Child1)
child2_state = ModelState.from_model(Child2)
index_names = [index.name for index in child1_state.options['indexes']]
self.assertEqual(index_names, ['migrations__name_b0afd7_idx'])
index_names = [index.name for index in child2_state.options['indexes']]
self.assertEqual(index_names, ['migrations__name_016466_idx'])
# Modifying the state doesn't modify the index on the model.
child1_state.options['indexes'][0].name = 'bar'
self.assertEqual(Child1._meta.indexes[0].name, 'migrations__name_b0afd7_idx')
@isolate_apps('migrations')
def test_explicit_index_name(self):
class TestModel(models.Model):
name = models.CharField(max_length=50)
class Meta:
app_label = 'migrations'
indexes = [models.Index(fields=['name'], name='foo_idx')]
model_state = ModelState.from_model(TestModel)
index_names = [index.name for index in model_state.options['indexes']]
self.assertEqual(index_names, ['foo_idx'])
@isolate_apps('migrations')
def test_from_model_constraints(self):
class ModelWithConstraints(models.Model):
size = models.IntegerField()
class Meta:
constraints = [models.CheckConstraint(check=models.Q(size__gt=1), name='size_gt_1')]
state = ModelState.from_model(ModelWithConstraints)
model_constraints = ModelWithConstraints._meta.constraints
state_constraints = state.options['constraints']
self.assertEqual(model_constraints, state_constraints)
self.assertIsNot(model_constraints, state_constraints)
self.assertIsNot(model_constraints[0], state_constraints[0])
class RelatedModelsTests(SimpleTestCase):
def setUp(self):
self.apps = Apps(['migrations.related_models_app'])
def create_model(self, name, foreign_keys=[], bases=(), abstract=False, proxy=False):
test_name = 'related_models_app'
assert not (abstract and proxy)
meta_contents = {
'abstract': abstract,
'app_label': test_name,
'apps': self.apps,
'proxy': proxy,
}
meta = type("Meta", (), meta_contents)
if not bases:
bases = (models.Model,)
body = {
'Meta': meta,
'__module__': "__fake__",
}
fname_base = fname = '%s_%%d' % name.lower()
for i, fk in enumerate(foreign_keys, 1):
fname = fname_base % i
body[fname] = fk
return type(name, bases, body)
def assertRelated(self, model, needle):
self.assertEqual(
get_related_models_recursive(model),
{(n._meta.app_label, n._meta.model_name) for n in needle},
)
def test_unrelated(self):
A = self.create_model("A")
B = self.create_model("B")
self.assertRelated(A, [])
self.assertRelated(B, [])
def test_direct_fk(self):
A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)])
B = self.create_model("B")
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_direct_hidden_fk(self):
A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE, related_name='+')])
B = self.create_model("B")
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_fk_through_proxy(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,), proxy=True)
C = self.create_model("C", bases=(B,), proxy=True)
D = self.create_model("D", foreign_keys=[models.ForeignKey('C', models.CASCADE)])
self.assertRelated(A, [B, C, D])
self.assertRelated(B, [A, C, D])
self.assertRelated(C, [A, B, D])
self.assertRelated(D, [A, B, C])
def test_nested_fk(self):
A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)])
B = self.create_model("B", foreign_keys=[models.ForeignKey('C', models.CASCADE)])
C = self.create_model("C")
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_two_sided(self):
A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)])
B = self.create_model("B", foreign_keys=[models.ForeignKey('A', models.CASCADE)])
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_circle(self):
A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)])
B = self.create_model("B", foreign_keys=[models.ForeignKey('C', models.CASCADE)])
C = self.create_model("C", foreign_keys=[models.ForeignKey('A', models.CASCADE)])
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,))
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_nested_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,))
C = self.create_model("C", bases=(B,))
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_multiple_bases(self):
A = self.create_model("A")
B = self.create_model("B")
C = self.create_model("C", bases=(A, B,))
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_multiple_nested_bases(self):
A = self.create_model("A")
B = self.create_model("B")
C = self.create_model("C", bases=(A, B,))
D = self.create_model("D")
E = self.create_model("E", bases=(D,))
F = self.create_model("F", bases=(C, E,))
Y = self.create_model("Y")
Z = self.create_model("Z", bases=(Y,))
self.assertRelated(A, [B, C, D, E, F])
self.assertRelated(B, [A, C, D, E, F])
self.assertRelated(C, [A, B, D, E, F])
self.assertRelated(D, [A, B, C, E, F])
self.assertRelated(E, [A, B, C, D, F])
self.assertRelated(F, [A, B, C, D, E])
self.assertRelated(Y, [Z])
self.assertRelated(Z, [Y])
def test_base_to_base_fk(self):
A = self.create_model("A", foreign_keys=[models.ForeignKey('Y', models.CASCADE)])
B = self.create_model("B", bases=(A,))
Y = self.create_model("Y")
Z = self.create_model("Z", bases=(Y,))
self.assertRelated(A, [B, Y, Z])
self.assertRelated(B, [A, Y, Z])
self.assertRelated(Y, [A, B, Z])
self.assertRelated(Z, [A, B, Y])
def test_base_to_subclass_fk(self):
A = self.create_model("A", foreign_keys=[models.ForeignKey('Z', models.CASCADE)])
B = self.create_model("B", bases=(A,))
Y = self.create_model("Y")
Z = self.create_model("Z", bases=(Y,))
self.assertRelated(A, [B, Y, Z])
self.assertRelated(B, [A, Y, Z])
self.assertRelated(Y, [A, B, Z])
self.assertRelated(Z, [A, B, Y])
def test_direct_m2m(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField('B')])
B = self.create_model("B")
self.assertRelated(A, [A.a_1.rel.through, B])
self.assertRelated(B, [A, A.a_1.rel.through])
def test_direct_m2m_self(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField('A')])
self.assertRelated(A, [A.a_1.rel.through])
def test_intermediate_m2m_self(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField('A', through='T')])
T = self.create_model("T", foreign_keys=[
models.ForeignKey('A', models.CASCADE),
models.ForeignKey('A', models.CASCADE),
])
self.assertRelated(A, [T])
self.assertRelated(T, [A])
def test_intermediate_m2m(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField('B', through='T')])
B = self.create_model("B")
T = self.create_model("T", foreign_keys=[
models.ForeignKey('A', models.CASCADE),
models.ForeignKey('B', models.CASCADE),
])
self.assertRelated(A, [B, T])
self.assertRelated(B, [A, T])
self.assertRelated(T, [A, B])
def test_intermediate_m2m_extern_fk(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField('B', through='T')])
B = self.create_model("B")
Z = self.create_model("Z")
T = self.create_model("T", foreign_keys=[
models.ForeignKey('A', models.CASCADE),
models.ForeignKey('B', models.CASCADE),
models.ForeignKey('Z', models.CASCADE),
])
self.assertRelated(A, [B, T, Z])
self.assertRelated(B, [A, T, Z])
self.assertRelated(T, [A, B, Z])
self.assertRelated(Z, [A, B, T])
def test_intermediate_m2m_base(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField('B', through='T')])
B = self.create_model("B")
S = self.create_model("S")
T = self.create_model("T", foreign_keys=[
models.ForeignKey('A', models.CASCADE),
models.ForeignKey('B', models.CASCADE),
], bases=(S,))
self.assertRelated(A, [B, S, T])
self.assertRelated(B, [A, S, T])
self.assertRelated(S, [A, B, T])
self.assertRelated(T, [A, B, S])
def test_generic_fk(self):
A = self.create_model("A", foreign_keys=[
models.ForeignKey('B', models.CASCADE),
GenericForeignKey(),
])
B = self.create_model("B", foreign_keys=[
models.ForeignKey('C', models.CASCADE),
])
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_abstract_base(self):
A = self.create_model("A", abstract=True)
B = self.create_model("B", bases=(A,))
self.assertRelated(A, [B])
self.assertRelated(B, [])
def test_nested_abstract_base(self):
A = self.create_model("A", abstract=True)
B = self.create_model("B", bases=(A,), abstract=True)
C = self.create_model("C", bases=(B,))
self.assertRelated(A, [B, C])
self.assertRelated(B, [C])
self.assertRelated(C, [])
def test_proxy_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,), proxy=True)
self.assertRelated(A, [B])
self.assertRelated(B, [])
def test_nested_proxy_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,), proxy=True)
C = self.create_model("C", bases=(B,), proxy=True)
self.assertRelated(A, [B, C])
self.assertRelated(B, [C])
self.assertRelated(C, [])
def test_multiple_mixed_bases(self):
A = self.create_model("A", abstract=True)
M = self.create_model("M")
P = self.create_model("P")
Q = self.create_model("Q", bases=(P,), proxy=True)
Z = self.create_model("Z", bases=(A, M, Q))
# M has a pointer O2O field p_ptr to P
self.assertRelated(A, [M, P, Q, Z])
self.assertRelated(M, [P, Q, Z])
self.assertRelated(P, [M, Q, Z])
self.assertRelated(Q, [M, P, Z])
self.assertRelated(Z, [M, P, Q])
|
81ec7d9042ee06a4ed22afa67494cb583306ec9bd094feaf347a5e9166778f22 | from datetime import datetime, timedelta
from django.conf import settings
from django.contrib.auth.models import User
from django.contrib.auth.tokens import PasswordResetTokenGenerator
from django.test import TestCase
class MockedPasswordResetTokenGenerator(PasswordResetTokenGenerator):
def __init__(self, now):
self._now_val = now
def _now(self):
return self._now_val
class TokenGeneratorTest(TestCase):
def test_make_token(self):
user = User.objects.create_user('tokentestuser', '[email protected]', 'testpw')
p0 = PasswordResetTokenGenerator()
tk1 = p0.make_token(user)
self.assertIs(p0.check_token(user, tk1), True)
def test_10265(self):
"""
The token generated for a user created in the same request
will work correctly.
"""
user = User.objects.create_user('comebackkid', '[email protected]', 'testpw')
user_reload = User.objects.get(username='comebackkid')
p0 = MockedPasswordResetTokenGenerator(datetime.now())
tk1 = p0.make_token(user)
tk2 = p0.make_token(user_reload)
self.assertEqual(tk1, tk2)
def test_timeout(self):
"""The token is valid after n seconds, but no greater."""
# Uses a mocked version of PasswordResetTokenGenerator so we can change
# the value of 'now'.
user = User.objects.create_user('tokentestuser', '[email protected]', 'testpw')
p0 = PasswordResetTokenGenerator()
tk1 = p0.make_token(user)
p1 = MockedPasswordResetTokenGenerator(
datetime.now() + timedelta(seconds=settings.PASSWORD_RESET_TIMEOUT)
)
self.assertIs(p1.check_token(user, tk1), True)
p2 = MockedPasswordResetTokenGenerator(
datetime.now() + timedelta(seconds=(settings.PASSWORD_RESET_TIMEOUT + 1))
)
self.assertIs(p2.check_token(user, tk1), False)
with self.settings(PASSWORD_RESET_TIMEOUT=60 * 60):
p3 = MockedPasswordResetTokenGenerator(
datetime.now() + timedelta(seconds=settings.PASSWORD_RESET_TIMEOUT)
)
self.assertIs(p3.check_token(user, tk1), True)
p4 = MockedPasswordResetTokenGenerator(
datetime.now() + timedelta(seconds=(settings.PASSWORD_RESET_TIMEOUT + 1))
)
self.assertIs(p4.check_token(user, tk1), False)
def test_check_token_with_nonexistent_token_and_user(self):
user = User.objects.create_user('tokentestuser', '[email protected]', 'testpw')
p0 = PasswordResetTokenGenerator()
tk1 = p0.make_token(user)
self.assertIs(p0.check_token(None, tk1), False)
self.assertIs(p0.check_token(user, None), False)
def test_token_with_different_secret(self):
"""
A valid token can be created with a secret other than SECRET_KEY by
using the PasswordResetTokenGenerator.secret attribute.
"""
user = User.objects.create_user('tokentestuser', '[email protected]', 'testpw')
new_secret = 'abcdefghijkl'
# Create and check a token with a different secret.
p0 = PasswordResetTokenGenerator()
p0.secret = new_secret
tk0 = p0.make_token(user)
self.assertIs(p0.check_token(user, tk0), True)
# Create and check a token with the default secret.
p1 = PasswordResetTokenGenerator()
self.assertEqual(p1.secret, settings.SECRET_KEY)
self.assertNotEqual(p1.secret, new_secret)
tk1 = p1.make_token(user)
# Tokens created with a different secret don't validate.
self.assertIs(p0.check_token(user, tk1), False)
self.assertIs(p1.check_token(user, tk0), False)
|
0c109feff437a0c05b7b1a121f7b0ddc2660f1f0e27de1111dce7bd921ac2e27 | from django.contrib.auth.checks import (
check_models_permissions, check_user_model,
)
from django.contrib.auth.models import AbstractBaseUser
from django.core import checks
from django.db import models
from django.test import (
SimpleTestCase, override_settings, override_system_checks,
)
from django.test.utils import isolate_apps
from .models import CustomUserNonUniqueUsername
@isolate_apps('auth_tests', attr_name='apps')
@override_system_checks([check_user_model])
class UserModelChecksTests(SimpleTestCase):
@override_settings(AUTH_USER_MODEL='auth_tests.CustomUserNonListRequiredFields')
def test_required_fields_is_list(self):
"""REQUIRED_FIELDS should be a list."""
class CustomUserNonListRequiredFields(AbstractBaseUser):
username = models.CharField(max_length=30, unique=True)
date_of_birth = models.DateField()
USERNAME_FIELD = 'username'
REQUIRED_FIELDS = 'date_of_birth'
errors = checks.run_checks(app_configs=self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"'REQUIRED_FIELDS' must be a list or tuple.",
obj=CustomUserNonListRequiredFields,
id='auth.E001',
),
])
@override_settings(AUTH_USER_MODEL='auth_tests.CustomUserBadRequiredFields')
def test_username_not_in_required_fields(self):
"""USERNAME_FIELD should not appear in REQUIRED_FIELDS."""
class CustomUserBadRequiredFields(AbstractBaseUser):
username = models.CharField(max_length=30, unique=True)
date_of_birth = models.DateField()
USERNAME_FIELD = 'username'
REQUIRED_FIELDS = ['username', 'date_of_birth']
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"The field named as the 'USERNAME_FIELD' for a custom user model "
"must not be included in 'REQUIRED_FIELDS'.",
obj=CustomUserBadRequiredFields,
id='auth.E002',
),
])
@override_settings(AUTH_USER_MODEL='auth_tests.CustomUserNonUniqueUsername')
def test_username_non_unique(self):
"""
A non-unique USERNAME_FIELD raises an error only if the default
authentication backend is used. Otherwise, a warning is raised.
"""
errors = checks.run_checks()
self.assertEqual(errors, [
checks.Error(
"'CustomUserNonUniqueUsername.username' must be "
"unique because it is named as the 'USERNAME_FIELD'.",
obj=CustomUserNonUniqueUsername,
id='auth.E003',
),
])
with self.settings(AUTHENTICATION_BACKENDS=['my.custom.backend']):
errors = checks.run_checks()
self.assertEqual(errors, [
checks.Warning(
"'CustomUserNonUniqueUsername.username' is named as "
"the 'USERNAME_FIELD', but it is not unique.",
hint='Ensure that your authentication backend(s) can handle non-unique usernames.',
obj=CustomUserNonUniqueUsername,
id='auth.W004',
),
])
@override_settings(AUTH_USER_MODEL='auth_tests.BadUser')
def test_is_anonymous_authenticated_methods(self):
"""
<User Model>.is_anonymous/is_authenticated must not be methods.
"""
class BadUser(AbstractBaseUser):
username = models.CharField(max_length=30, unique=True)
USERNAME_FIELD = 'username'
def is_anonymous(self):
return True
def is_authenticated(self):
return True
errors = checks.run_checks(app_configs=self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Critical(
'%s.is_anonymous must be an attribute or property rather than '
'a method. Ignoring this is a security issue as anonymous '
'users will be treated as authenticated!' % BadUser,
obj=BadUser,
id='auth.C009',
),
checks.Critical(
'%s.is_authenticated must be an attribute or property rather '
'than a method. Ignoring this is a security issue as anonymous '
'users will be treated as authenticated!' % BadUser,
obj=BadUser,
id='auth.C010',
),
])
@isolate_apps('auth_tests', attr_name='apps')
@override_system_checks([check_models_permissions])
class ModelsPermissionsChecksTests(SimpleTestCase):
def test_clashing_default_permissions(self):
class Checked(models.Model):
class Meta:
permissions = [
('change_checked', 'Can edit permission (duplicate)')
]
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"The permission codenamed 'change_checked' clashes with a builtin "
"permission for model 'auth_tests.Checked'.",
obj=Checked,
id='auth.E005',
),
])
def test_non_clashing_custom_permissions(self):
class Checked(models.Model):
class Meta:
permissions = [
('my_custom_permission', 'Some permission'),
('other_one', 'Some other permission'),
]
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [])
def test_clashing_custom_permissions(self):
class Checked(models.Model):
class Meta:
permissions = [
('my_custom_permission', 'Some permission'),
('other_one', 'Some other permission'),
('my_custom_permission', 'Some permission with duplicate permission code'),
]
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"The permission codenamed 'my_custom_permission' is duplicated for "
"model 'auth_tests.Checked'.",
obj=Checked,
id='auth.E006',
),
])
def test_verbose_name_max_length(self):
class Checked(models.Model):
class Meta:
verbose_name = 'some ridiculously long verbose name that is out of control' * 5
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"The verbose_name of model 'auth_tests.Checked' must be at most 244 "
"characters for its builtin permission names to be at most 255 characters.",
obj=Checked,
id='auth.E007',
),
])
def test_model_name_max_length(self):
model_name = 'X' * 94
model = type(model_name, (models.Model,), {'__module__': self.__module__})
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"The name of model 'auth_tests.%s' must be at most 93 "
"characters for its builtin permission codenames to be at "
"most 100 characters." % model_name,
obj=model,
id='auth.E011',
),
])
def test_custom_permission_name_max_length(self):
custom_permission_name = 'some ridiculously long verbose name that is out of control' * 5
class Checked(models.Model):
class Meta:
permissions = [
('my_custom_permission', custom_permission_name),
]
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"The permission named '%s' of model 'auth_tests.Checked' is longer "
"than 255 characters." % custom_permission_name,
obj=Checked,
id='auth.E008',
),
])
def test_custom_permission_codename_max_length(self):
custom_permission_codename = 'x' * 101
class Checked(models.Model):
class Meta:
permissions = [
(custom_permission_codename, 'Custom permission'),
]
errors = checks.run_checks(self.apps.get_app_configs())
self.assertEqual(errors, [
checks.Error(
"The permission codenamed '%s' of model 'auth_tests.Checked' "
"is longer than 100 characters." % custom_permission_codename,
obj=Checked,
id='auth.E012',
),
])
def test_empty_default_permissions(self):
class Checked(models.Model):
class Meta:
default_permissions = ()
self.assertEqual(checks.run_checks(self.apps.get_app_configs()), [])
|
39ae50b7e28c78aef9878671e2ad80dca7d0738abba783a9c6fe5f6ebefe58e9 | from unittest import mock, skipUnless
from django.conf.global_settings import PASSWORD_HASHERS
from django.contrib.auth.hashers import (
UNUSABLE_PASSWORD_PREFIX, UNUSABLE_PASSWORD_SUFFIX_LENGTH,
BasePasswordHasher, PBKDF2PasswordHasher, PBKDF2SHA1PasswordHasher,
check_password, get_hasher, identify_hasher, is_password_usable,
make_password,
)
from django.test import SimpleTestCase
from django.test.utils import override_settings
try:
import crypt
except ImportError:
crypt = None
else:
# On some platforms (e.g. OpenBSD), crypt.crypt() always return None.
if crypt.crypt('') is None:
crypt = None
try:
import bcrypt
except ImportError:
bcrypt = None
try:
import argon2
except ImportError:
argon2 = None
class PBKDF2SingleIterationHasher(PBKDF2PasswordHasher):
iterations = 1
@override_settings(PASSWORD_HASHERS=PASSWORD_HASHERS)
class TestUtilsHashPass(SimpleTestCase):
def test_simple(self):
encoded = make_password('lètmein')
self.assertTrue(encoded.startswith('pbkdf2_sha256$'))
self.assertTrue(is_password_usable(encoded))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
# Blank passwords
blank_encoded = make_password('')
self.assertTrue(blank_encoded.startswith('pbkdf2_sha256$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
def test_pbkdf2(self):
encoded = make_password('lètmein', 'seasalt', 'pbkdf2_sha256')
self.assertEqual(encoded, 'pbkdf2_sha256$216000$seasalt$youGZxOw6ZOcfrXv2i8/AhrnpZflJJ9EshS9XmUJTUg=')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "pbkdf2_sha256")
# Blank passwords
blank_encoded = make_password('', 'seasalt', 'pbkdf2_sha256')
self.assertTrue(blank_encoded.startswith('pbkdf2_sha256$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.SHA1PasswordHasher'])
def test_sha1(self):
encoded = make_password('lètmein', 'seasalt', 'sha1')
self.assertEqual(encoded, 'sha1$seasalt$cff36ea83f5706ce9aa7454e63e431fc726b2dc8')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "sha1")
# Blank passwords
blank_encoded = make_password('', 'seasalt', 'sha1')
self.assertTrue(blank_encoded.startswith('sha1$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.MD5PasswordHasher'])
def test_md5(self):
encoded = make_password('lètmein', 'seasalt', 'md5')
self.assertEqual(encoded, 'md5$seasalt$3f86d0d3d465b7b458c231bf3555c0e3')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "md5")
# Blank passwords
blank_encoded = make_password('', 'seasalt', 'md5')
self.assertTrue(blank_encoded.startswith('md5$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.UnsaltedMD5PasswordHasher'])
def test_unsalted_md5(self):
encoded = make_password('lètmein', '', 'unsalted_md5')
self.assertEqual(encoded, '88a434c88cca4e900f7874cd98123f43')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "unsalted_md5")
# Alternate unsalted syntax
alt_encoded = "md5$$%s" % encoded
self.assertTrue(is_password_usable(alt_encoded))
self.assertTrue(check_password('lètmein', alt_encoded))
self.assertFalse(check_password('lètmeinz', alt_encoded))
# Blank passwords
blank_encoded = make_password('', '', 'unsalted_md5')
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.UnsaltedSHA1PasswordHasher'])
def test_unsalted_sha1(self):
encoded = make_password('lètmein', '', 'unsalted_sha1')
self.assertEqual(encoded, 'sha1$$6d138ca3ae545631b3abd71a4f076ce759c5700b')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "unsalted_sha1")
# Raw SHA1 isn't acceptable
alt_encoded = encoded[6:]
self.assertFalse(check_password('lètmein', alt_encoded))
# Blank passwords
blank_encoded = make_password('', '', 'unsalted_sha1')
self.assertTrue(blank_encoded.startswith('sha1$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@skipUnless(crypt, "no crypt module to generate password.")
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.CryptPasswordHasher'])
def test_crypt(self):
encoded = make_password('lètmei', 'ab', 'crypt')
self.assertEqual(encoded, 'crypt$$ab1Hv2Lg7ltQo')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(check_password('lètmei', encoded))
self.assertFalse(check_password('lètmeiz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "crypt")
# Blank passwords
blank_encoded = make_password('', 'ab', 'crypt')
self.assertTrue(blank_encoded.startswith('crypt$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@skipUnless(bcrypt, "bcrypt not installed")
def test_bcrypt_sha256(self):
encoded = make_password('lètmein', hasher='bcrypt_sha256')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(encoded.startswith('bcrypt_sha256$'))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "bcrypt_sha256")
# password truncation no longer works
password = (
'VSK0UYV6FFQVZ0KG88DYN9WADAADZO1CTSIVDJUNZSUML6IBX7LN7ZS3R5'
'JGB3RGZ7VI7G7DJQ9NI8BQFSRPTG6UWTTVESA5ZPUN'
)
encoded = make_password(password, hasher='bcrypt_sha256')
self.assertTrue(check_password(password, encoded))
self.assertFalse(check_password(password[:72], encoded))
# Blank passwords
blank_encoded = make_password('', hasher='bcrypt_sha256')
self.assertTrue(blank_encoded.startswith('bcrypt_sha256$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@skipUnless(bcrypt, "bcrypt not installed")
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.BCryptPasswordHasher'])
def test_bcrypt(self):
encoded = make_password('lètmein', hasher='bcrypt')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(encoded.startswith('bcrypt$'))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, "bcrypt")
# Blank passwords
blank_encoded = make_password('', hasher='bcrypt')
self.assertTrue(blank_encoded.startswith('bcrypt$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
@skipUnless(bcrypt, "bcrypt not installed")
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.BCryptPasswordHasher'])
def test_bcrypt_upgrade(self):
hasher = get_hasher('bcrypt')
self.assertEqual('bcrypt', hasher.algorithm)
self.assertNotEqual(hasher.rounds, 4)
old_rounds = hasher.rounds
try:
# Generate a password with 4 rounds.
hasher.rounds = 4
encoded = make_password('letmein', hasher='bcrypt')
rounds = hasher.safe_summary(encoded)['work factor']
self.assertEqual(rounds, '04')
state = {'upgraded': False}
def setter(password):
state['upgraded'] = True
# No upgrade is triggered.
self.assertTrue(check_password('letmein', encoded, setter, 'bcrypt'))
self.assertFalse(state['upgraded'])
# Revert to the old rounds count and ...
hasher.rounds = old_rounds
# ... check if the password would get updated to the new count.
self.assertTrue(check_password('letmein', encoded, setter, 'bcrypt'))
self.assertTrue(state['upgraded'])
finally:
hasher.rounds = old_rounds
@skipUnless(bcrypt, "bcrypt not installed")
@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.BCryptPasswordHasher'])
def test_bcrypt_harden_runtime(self):
hasher = get_hasher('bcrypt')
self.assertEqual('bcrypt', hasher.algorithm)
with mock.patch.object(hasher, 'rounds', 4):
encoded = make_password('letmein', hasher='bcrypt')
with mock.patch.object(hasher, 'rounds', 6), \
mock.patch.object(hasher, 'encode', side_effect=hasher.encode):
hasher.harden_runtime('wrong_password', encoded)
# Increasing rounds from 4 to 6 means an increase of 4 in workload,
# therefore hardening should run 3 times to make the timing the
# same (the original encode() call already ran once).
self.assertEqual(hasher.encode.call_count, 3)
# Get the original salt (includes the original workload factor)
algorithm, data = encoded.split('$', 1)
expected_call = (('wrong_password', data[:29].encode()),)
self.assertEqual(hasher.encode.call_args_list, [expected_call] * 3)
def test_unusable(self):
encoded = make_password(None)
self.assertEqual(len(encoded), len(UNUSABLE_PASSWORD_PREFIX) + UNUSABLE_PASSWORD_SUFFIX_LENGTH)
self.assertFalse(is_password_usable(encoded))
self.assertFalse(check_password(None, encoded))
self.assertFalse(check_password(encoded, encoded))
self.assertFalse(check_password(UNUSABLE_PASSWORD_PREFIX, encoded))
self.assertFalse(check_password('', encoded))
self.assertFalse(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
with self.assertRaisesMessage(ValueError, 'Unknown password hashing algorith'):
identify_hasher(encoded)
# Assert that the unusable passwords actually contain a random part.
# This might fail one day due to a hash collision.
self.assertNotEqual(encoded, make_password(None), "Random password collision?")
def test_unspecified_password(self):
"""
Makes sure specifying no plain password with a valid encoded password
returns `False`.
"""
self.assertFalse(check_password(None, make_password('lètmein')))
def test_bad_algorithm(self):
msg = (
"Unknown password hashing algorithm '%s'. Did you specify it in "
"the PASSWORD_HASHERS setting?"
)
with self.assertRaisesMessage(ValueError, msg % 'lolcat'):
make_password('lètmein', hasher='lolcat')
with self.assertRaisesMessage(ValueError, msg % 'lolcat'):
identify_hasher('lolcat$salt$hash')
def test_is_password_usable(self):
passwords = ('lètmein_badencoded', '', None)
for password in passwords:
with self.subTest(password=password):
self.assertIs(is_password_usable(password), True)
def test_low_level_pbkdf2(self):
hasher = PBKDF2PasswordHasher()
encoded = hasher.encode('lètmein', 'seasalt2')
self.assertEqual(encoded, 'pbkdf2_sha256$216000$seasalt2$gHyszNJ9lwTG5y3MQUjZe+OJmYVTBPl/y7bYq9dtk8M=')
self.assertTrue(hasher.verify('lètmein', encoded))
def test_low_level_pbkdf2_sha1(self):
hasher = PBKDF2SHA1PasswordHasher()
encoded = hasher.encode('lètmein', 'seasalt2')
self.assertEqual(encoded, 'pbkdf2_sha1$216000$seasalt2$E1KH89wMKuPXrrQzifVcG4cBtiA=')
self.assertTrue(hasher.verify('lètmein', encoded))
@override_settings(
PASSWORD_HASHERS=[
'django.contrib.auth.hashers.PBKDF2PasswordHasher',
'django.contrib.auth.hashers.SHA1PasswordHasher',
'django.contrib.auth.hashers.MD5PasswordHasher',
],
)
def test_upgrade(self):
self.assertEqual('pbkdf2_sha256', get_hasher('default').algorithm)
for algo in ('sha1', 'md5'):
with self.subTest(algo=algo):
encoded = make_password('lètmein', hasher=algo)
state = {'upgraded': False}
def setter(password):
state['upgraded'] = True
self.assertTrue(check_password('lètmein', encoded, setter))
self.assertTrue(state['upgraded'])
def test_no_upgrade(self):
encoded = make_password('lètmein')
state = {'upgraded': False}
def setter():
state['upgraded'] = True
self.assertFalse(check_password('WRONG', encoded, setter))
self.assertFalse(state['upgraded'])
@override_settings(
PASSWORD_HASHERS=[
'django.contrib.auth.hashers.PBKDF2PasswordHasher',
'django.contrib.auth.hashers.SHA1PasswordHasher',
'django.contrib.auth.hashers.MD5PasswordHasher',
],
)
def test_no_upgrade_on_incorrect_pass(self):
self.assertEqual('pbkdf2_sha256', get_hasher('default').algorithm)
for algo in ('sha1', 'md5'):
with self.subTest(algo=algo):
encoded = make_password('lètmein', hasher=algo)
state = {'upgraded': False}
def setter():
state['upgraded'] = True
self.assertFalse(check_password('WRONG', encoded, setter))
self.assertFalse(state['upgraded'])
def test_pbkdf2_upgrade(self):
hasher = get_hasher('default')
self.assertEqual('pbkdf2_sha256', hasher.algorithm)
self.assertNotEqual(hasher.iterations, 1)
old_iterations = hasher.iterations
try:
# Generate a password with 1 iteration.
hasher.iterations = 1
encoded = make_password('letmein')
algo, iterations, salt, hash = encoded.split('$', 3)
self.assertEqual(iterations, '1')
state = {'upgraded': False}
def setter(password):
state['upgraded'] = True
# No upgrade is triggered
self.assertTrue(check_password('letmein', encoded, setter))
self.assertFalse(state['upgraded'])
# Revert to the old iteration count and ...
hasher.iterations = old_iterations
# ... check if the password would get updated to the new iteration count.
self.assertTrue(check_password('letmein', encoded, setter))
self.assertTrue(state['upgraded'])
finally:
hasher.iterations = old_iterations
def test_pbkdf2_harden_runtime(self):
hasher = get_hasher('default')
self.assertEqual('pbkdf2_sha256', hasher.algorithm)
with mock.patch.object(hasher, 'iterations', 1):
encoded = make_password('letmein')
with mock.patch.object(hasher, 'iterations', 6), \
mock.patch.object(hasher, 'encode', side_effect=hasher.encode):
hasher.harden_runtime('wrong_password', encoded)
# Encode should get called once ...
self.assertEqual(hasher.encode.call_count, 1)
# ... with the original salt and 5 iterations.
algorithm, iterations, salt, hash = encoded.split('$', 3)
expected_call = (('wrong_password', salt, 5),)
self.assertEqual(hasher.encode.call_args, expected_call)
def test_pbkdf2_upgrade_new_hasher(self):
hasher = get_hasher('default')
self.assertEqual('pbkdf2_sha256', hasher.algorithm)
self.assertNotEqual(hasher.iterations, 1)
state = {'upgraded': False}
def setter(password):
state['upgraded'] = True
with self.settings(PASSWORD_HASHERS=[
'auth_tests.test_hashers.PBKDF2SingleIterationHasher']):
encoded = make_password('letmein')
algo, iterations, salt, hash = encoded.split('$', 3)
self.assertEqual(iterations, '1')
# No upgrade is triggered
self.assertTrue(check_password('letmein', encoded, setter))
self.assertFalse(state['upgraded'])
# Revert to the old iteration count and check if the password would get
# updated to the new iteration count.
with self.settings(PASSWORD_HASHERS=[
'django.contrib.auth.hashers.PBKDF2PasswordHasher',
'auth_tests.test_hashers.PBKDF2SingleIterationHasher']):
self.assertTrue(check_password('letmein', encoded, setter))
self.assertTrue(state['upgraded'])
def test_check_password_calls_harden_runtime(self):
hasher = get_hasher('default')
encoded = make_password('letmein')
with mock.patch.object(hasher, 'harden_runtime'), \
mock.patch.object(hasher, 'must_update', return_value=True):
# Correct password supplied, no hardening needed
check_password('letmein', encoded)
self.assertEqual(hasher.harden_runtime.call_count, 0)
# Wrong password supplied, hardening needed
check_password('wrong_password', encoded)
self.assertEqual(hasher.harden_runtime.call_count, 1)
class BasePasswordHasherTests(SimpleTestCase):
not_implemented_msg = 'subclasses of BasePasswordHasher must provide %s() method'
def setUp(self):
self.hasher = BasePasswordHasher()
def test_load_library_no_algorithm(self):
msg = "Hasher 'BasePasswordHasher' doesn't specify a library attribute"
with self.assertRaisesMessage(ValueError, msg):
self.hasher._load_library()
def test_load_library_importerror(self):
PlainHasher = type('PlainHasher', (BasePasswordHasher,), {'algorithm': 'plain', 'library': 'plain'})
msg = "Couldn't load 'PlainHasher' algorithm library: No module named 'plain'"
with self.assertRaisesMessage(ValueError, msg):
PlainHasher()._load_library()
def test_attributes(self):
self.assertIsNone(self.hasher.algorithm)
self.assertIsNone(self.hasher.library)
def test_encode(self):
msg = self.not_implemented_msg % 'an encode'
with self.assertRaisesMessage(NotImplementedError, msg):
self.hasher.encode('password', 'salt')
def test_harden_runtime(self):
msg = 'subclasses of BasePasswordHasher should provide a harden_runtime() method'
with self.assertWarnsMessage(Warning, msg):
self.hasher.harden_runtime('password', 'encoded')
def test_must_update(self):
self.assertIs(self.hasher.must_update('encoded'), False)
def test_safe_summary(self):
msg = self.not_implemented_msg % 'a safe_summary'
with self.assertRaisesMessage(NotImplementedError, msg):
self.hasher.safe_summary('encoded')
def test_verify(self):
msg = self.not_implemented_msg % 'a verify'
with self.assertRaisesMessage(NotImplementedError, msg):
self.hasher.verify('password', 'encoded')
@skipUnless(argon2, "argon2-cffi not installed")
@override_settings(PASSWORD_HASHERS=PASSWORD_HASHERS)
class TestUtilsHashPassArgon2(SimpleTestCase):
def test_argon2(self):
encoded = make_password('lètmein', hasher='argon2')
self.assertTrue(is_password_usable(encoded))
self.assertTrue(encoded.startswith('argon2$'))
self.assertTrue(check_password('lètmein', encoded))
self.assertFalse(check_password('lètmeinz', encoded))
self.assertEqual(identify_hasher(encoded).algorithm, 'argon2')
# Blank passwords
blank_encoded = make_password('', hasher='argon2')
self.assertTrue(blank_encoded.startswith('argon2$'))
self.assertTrue(is_password_usable(blank_encoded))
self.assertTrue(check_password('', blank_encoded))
self.assertFalse(check_password(' ', blank_encoded))
# Old hashes without version attribute
encoded = (
'argon2$argon2i$m=8,t=1,p=1$c29tZXNhbHQ$gwQOXSNhxiOxPOA0+PY10P9QFO'
'4NAYysnqRt1GSQLE55m+2GYDt9FEjPMHhP2Cuf0nOEXXMocVrsJAtNSsKyfg'
)
self.assertTrue(check_password('secret', encoded))
self.assertFalse(check_password('wrong', encoded))
def test_argon2_upgrade(self):
self._test_argon2_upgrade('time_cost', 'time cost', 1)
self._test_argon2_upgrade('memory_cost', 'memory cost', 16)
self._test_argon2_upgrade('parallelism', 'parallelism', 1)
def test_argon2_version_upgrade(self):
hasher = get_hasher('argon2')
state = {'upgraded': False}
encoded = (
'argon2$argon2i$m=8,t=1,p=1$c29tZXNhbHQ$gwQOXSNhxiOxPOA0+PY10P9QFO'
'4NAYysnqRt1GSQLE55m+2GYDt9FEjPMHhP2Cuf0nOEXXMocVrsJAtNSsKyfg'
)
def setter(password):
state['upgraded'] = True
old_m = hasher.memory_cost
old_t = hasher.time_cost
old_p = hasher.parallelism
try:
hasher.memory_cost = 8
hasher.time_cost = 1
hasher.parallelism = 1
self.assertTrue(check_password('secret', encoded, setter, 'argon2'))
self.assertTrue(state['upgraded'])
finally:
hasher.memory_cost = old_m
hasher.time_cost = old_t
hasher.parallelism = old_p
def _test_argon2_upgrade(self, attr, summary_key, new_value):
hasher = get_hasher('argon2')
self.assertEqual('argon2', hasher.algorithm)
self.assertNotEqual(getattr(hasher, attr), new_value)
old_value = getattr(hasher, attr)
try:
# Generate hash with attr set to 1
setattr(hasher, attr, new_value)
encoded = make_password('letmein', hasher='argon2')
attr_value = hasher.safe_summary(encoded)[summary_key]
self.assertEqual(attr_value, new_value)
state = {'upgraded': False}
def setter(password):
state['upgraded'] = True
# No upgrade is triggered.
self.assertTrue(check_password('letmein', encoded, setter, 'argon2'))
self.assertFalse(state['upgraded'])
# Revert to the old rounds count and ...
setattr(hasher, attr, old_value)
# ... check if the password would get updated to the new count.
self.assertTrue(check_password('letmein', encoded, setter, 'argon2'))
self.assertTrue(state['upgraded'])
finally:
setattr(hasher, attr, old_value)
|
2d82f0ac3b17829a2c07de5fc7b7de9c505f0c34336ff0aee32ace6a073903c4 | import datetime
import re
from decimal import Decimal
from django.core.exceptions import FieldError
from django.db import connection
from django.db.models import (
Avg, Case, Count, DecimalField, DurationField, Exists, F, FloatField, Func,
IntegerField, Max, Min, OuterRef, Subquery, Sum, Value, When,
)
from django.db.models.functions import Coalesce
from django.test import TestCase
from django.test.testcases import skipUnlessDBFeature
from django.test.utils import Approximate, CaptureQueriesContext
from django.utils import timezone
from .models import Author, Book, Publisher, Store
class AggregateTestCase(TestCase):
@classmethod
def setUpTestData(cls):
cls.a1 = Author.objects.create(name='Adrian Holovaty', age=34)
cls.a2 = Author.objects.create(name='Jacob Kaplan-Moss', age=35)
cls.a3 = Author.objects.create(name='Brad Dayley', age=45)
cls.a4 = Author.objects.create(name='James Bennett', age=29)
cls.a5 = Author.objects.create(name='Jeffrey Forcier', age=37)
cls.a6 = Author.objects.create(name='Paul Bissex', age=29)
cls.a7 = Author.objects.create(name='Wesley J. Chun', age=25)
cls.a8 = Author.objects.create(name='Peter Norvig', age=57)
cls.a9 = Author.objects.create(name='Stuart Russell', age=46)
cls.a1.friends.add(cls.a2, cls.a4)
cls.a2.friends.add(cls.a1, cls.a7)
cls.a4.friends.add(cls.a1)
cls.a5.friends.add(cls.a6, cls.a7)
cls.a6.friends.add(cls.a5, cls.a7)
cls.a7.friends.add(cls.a2, cls.a5, cls.a6)
cls.a8.friends.add(cls.a9)
cls.a9.friends.add(cls.a8)
cls.p1 = Publisher.objects.create(name='Apress', num_awards=3, duration=datetime.timedelta(days=1))
cls.p2 = Publisher.objects.create(name='Sams', num_awards=1, duration=datetime.timedelta(days=2))
cls.p3 = Publisher.objects.create(name='Prentice Hall', num_awards=7)
cls.p4 = Publisher.objects.create(name='Morgan Kaufmann', num_awards=9)
cls.p5 = Publisher.objects.create(name="Jonno's House of Books", num_awards=0)
cls.b1 = Book.objects.create(
isbn='159059725', name='The Definitive Guide to Django: Web Development Done Right',
pages=447, rating=4.5, price=Decimal('30.00'), contact=cls.a1, publisher=cls.p1,
pubdate=datetime.date(2007, 12, 6)
)
cls.b2 = Book.objects.create(
isbn='067232959', name='Sams Teach Yourself Django in 24 Hours',
pages=528, rating=3.0, price=Decimal('23.09'), contact=cls.a3, publisher=cls.p2,
pubdate=datetime.date(2008, 3, 3)
)
cls.b3 = Book.objects.create(
isbn='159059996', name='Practical Django Projects',
pages=300, rating=4.0, price=Decimal('29.69'), contact=cls.a4, publisher=cls.p1,
pubdate=datetime.date(2008, 6, 23)
)
cls.b4 = Book.objects.create(
isbn='013235613', name='Python Web Development with Django',
pages=350, rating=4.0, price=Decimal('29.69'), contact=cls.a5, publisher=cls.p3,
pubdate=datetime.date(2008, 11, 3)
)
cls.b5 = Book.objects.create(
isbn='013790395', name='Artificial Intelligence: A Modern Approach',
pages=1132, rating=4.0, price=Decimal('82.80'), contact=cls.a8, publisher=cls.p3,
pubdate=datetime.date(1995, 1, 15)
)
cls.b6 = Book.objects.create(
isbn='155860191', name='Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp',
pages=946, rating=5.0, price=Decimal('75.00'), contact=cls.a8, publisher=cls.p4,
pubdate=datetime.date(1991, 10, 15)
)
cls.b1.authors.add(cls.a1, cls.a2)
cls.b2.authors.add(cls.a3)
cls.b3.authors.add(cls.a4)
cls.b4.authors.add(cls.a5, cls.a6, cls.a7)
cls.b5.authors.add(cls.a8, cls.a9)
cls.b6.authors.add(cls.a8)
s1 = Store.objects.create(
name='Amazon.com',
original_opening=datetime.datetime(1994, 4, 23, 9, 17, 42),
friday_night_closing=datetime.time(23, 59, 59)
)
s2 = Store.objects.create(
name='Books.com',
original_opening=datetime.datetime(2001, 3, 15, 11, 23, 37),
friday_night_closing=datetime.time(23, 59, 59)
)
s3 = Store.objects.create(
name="Mamma and Pappa's Books",
original_opening=datetime.datetime(1945, 4, 25, 16, 24, 14),
friday_night_closing=datetime.time(21, 30)
)
s1.books.add(cls.b1, cls.b2, cls.b3, cls.b4, cls.b5, cls.b6)
s2.books.add(cls.b1, cls.b3, cls.b5, cls.b6)
s3.books.add(cls.b3, cls.b4, cls.b6)
def test_empty_aggregate(self):
self.assertEqual(Author.objects.all().aggregate(), {})
def test_aggregate_in_order_by(self):
msg = (
'Using an aggregate in order_by() without also including it in '
'annotate() is not allowed: Avg(F(book__rating)'
)
with self.assertRaisesMessage(FieldError, msg):
Author.objects.values('age').order_by(Avg('book__rating'))
def test_single_aggregate(self):
vals = Author.objects.aggregate(Avg("age"))
self.assertEqual(vals, {"age__avg": Approximate(37.4, places=1)})
def test_multiple_aggregates(self):
vals = Author.objects.aggregate(Sum("age"), Avg("age"))
self.assertEqual(vals, {"age__sum": 337, "age__avg": Approximate(37.4, places=1)})
def test_filter_aggregate(self):
vals = Author.objects.filter(age__gt=29).aggregate(Sum("age"))
self.assertEqual(vals, {'age__sum': 254})
def test_related_aggregate(self):
vals = Author.objects.aggregate(Avg("friends__age"))
self.assertEqual(vals, {'friends__age__avg': Approximate(34.07, places=2)})
vals = Book.objects.filter(rating__lt=4.5).aggregate(Avg("authors__age"))
self.assertEqual(vals, {'authors__age__avg': Approximate(38.2857, places=2)})
vals = Author.objects.all().filter(name__contains="a").aggregate(Avg("book__rating"))
self.assertEqual(vals, {'book__rating__avg': 4.0})
vals = Book.objects.aggregate(Sum("publisher__num_awards"))
self.assertEqual(vals, {'publisher__num_awards__sum': 30})
vals = Publisher.objects.aggregate(Sum("book__price"))
self.assertEqual(vals, {'book__price__sum': Decimal('270.27')})
def test_aggregate_multi_join(self):
vals = Store.objects.aggregate(Max("books__authors__age"))
self.assertEqual(vals, {'books__authors__age__max': 57})
vals = Author.objects.aggregate(Min("book__publisher__num_awards"))
self.assertEqual(vals, {'book__publisher__num_awards__min': 1})
def test_aggregate_alias(self):
vals = Store.objects.filter(name="Amazon.com").aggregate(amazon_mean=Avg("books__rating"))
self.assertEqual(vals, {'amazon_mean': Approximate(4.08, places=2)})
def test_annotate_basic(self):
self.assertQuerysetEqual(
Book.objects.annotate().order_by('pk'), [
"The Definitive Guide to Django: Web Development Done Right",
"Sams Teach Yourself Django in 24 Hours",
"Practical Django Projects",
"Python Web Development with Django",
"Artificial Intelligence: A Modern Approach",
"Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp"
],
lambda b: b.name
)
books = Book.objects.annotate(mean_age=Avg("authors__age"))
b = books.get(pk=self.b1.pk)
self.assertEqual(
b.name,
'The Definitive Guide to Django: Web Development Done Right'
)
self.assertEqual(b.mean_age, 34.5)
def test_annotate_defer(self):
qs = Book.objects.annotate(
page_sum=Sum("pages")).defer('name').filter(pk=self.b1.pk)
rows = [
(self.b1.id, "159059725", 447, "The Definitive Guide to Django: Web Development Done Right")
]
self.assertQuerysetEqual(
qs.order_by('pk'), rows,
lambda r: (r.id, r.isbn, r.page_sum, r.name)
)
def test_annotate_defer_select_related(self):
qs = Book.objects.select_related('contact').annotate(
page_sum=Sum("pages")).defer('name').filter(pk=self.b1.pk)
rows = [
(self.b1.id, "159059725", 447, "Adrian Holovaty",
"The Definitive Guide to Django: Web Development Done Right")
]
self.assertQuerysetEqual(
qs.order_by('pk'), rows,
lambda r: (r.id, r.isbn, r.page_sum, r.contact.name, r.name)
)
def test_annotate_m2m(self):
books = Book.objects.filter(rating__lt=4.5).annotate(Avg("authors__age")).order_by("name")
self.assertQuerysetEqual(
books, [
('Artificial Intelligence: A Modern Approach', 51.5),
('Practical Django Projects', 29.0),
('Python Web Development with Django', Approximate(30.3, places=1)),
('Sams Teach Yourself Django in 24 Hours', 45.0)
],
lambda b: (b.name, b.authors__age__avg),
)
books = Book.objects.annotate(num_authors=Count("authors")).order_by("name")
self.assertQuerysetEqual(
books, [
('Artificial Intelligence: A Modern Approach', 2),
('Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', 1),
('Practical Django Projects', 1),
('Python Web Development with Django', 3),
('Sams Teach Yourself Django in 24 Hours', 1),
('The Definitive Guide to Django: Web Development Done Right', 2)
],
lambda b: (b.name, b.num_authors)
)
def test_backwards_m2m_annotate(self):
authors = Author.objects.filter(name__contains="a").annotate(Avg("book__rating")).order_by("name")
self.assertQuerysetEqual(
authors, [
('Adrian Holovaty', 4.5),
('Brad Dayley', 3.0),
('Jacob Kaplan-Moss', 4.5),
('James Bennett', 4.0),
('Paul Bissex', 4.0),
('Stuart Russell', 4.0)
],
lambda a: (a.name, a.book__rating__avg)
)
authors = Author.objects.annotate(num_books=Count("book")).order_by("name")
self.assertQuerysetEqual(
authors, [
('Adrian Holovaty', 1),
('Brad Dayley', 1),
('Jacob Kaplan-Moss', 1),
('James Bennett', 1),
('Jeffrey Forcier', 1),
('Paul Bissex', 1),
('Peter Norvig', 2),
('Stuart Russell', 1),
('Wesley J. Chun', 1)
],
lambda a: (a.name, a.num_books)
)
def test_reverse_fkey_annotate(self):
books = Book.objects.annotate(Sum("publisher__num_awards")).order_by("name")
self.assertQuerysetEqual(
books, [
('Artificial Intelligence: A Modern Approach', 7),
('Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', 9),
('Practical Django Projects', 3),
('Python Web Development with Django', 7),
('Sams Teach Yourself Django in 24 Hours', 1),
('The Definitive Guide to Django: Web Development Done Right', 3)
],
lambda b: (b.name, b.publisher__num_awards__sum)
)
publishers = Publisher.objects.annotate(Sum("book__price")).order_by("name")
self.assertQuerysetEqual(
publishers, [
('Apress', Decimal("59.69")),
("Jonno's House of Books", None),
('Morgan Kaufmann', Decimal("75.00")),
('Prentice Hall', Decimal("112.49")),
('Sams', Decimal("23.09"))
],
lambda p: (p.name, p.book__price__sum)
)
def test_annotate_values(self):
books = list(Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values())
self.assertEqual(
books, [
{
"contact_id": self.a1.id,
"id": self.b1.id,
"isbn": "159059725",
"mean_age": 34.5,
"name": "The Definitive Guide to Django: Web Development Done Right",
"pages": 447,
"price": Approximate(Decimal("30")),
"pubdate": datetime.date(2007, 12, 6),
"publisher_id": self.p1.id,
"rating": 4.5,
}
]
)
books = (
Book.objects
.filter(pk=self.b1.pk)
.annotate(mean_age=Avg('authors__age'))
.values('pk', 'isbn', 'mean_age')
)
self.assertEqual(
list(books), [
{
"pk": self.b1.pk,
"isbn": "159059725",
"mean_age": 34.5,
}
]
)
books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values("name")
self.assertEqual(
list(books),
[{'name': 'The Definitive Guide to Django: Web Development Done Right'}],
)
books = Book.objects.filter(pk=self.b1.pk).values().annotate(mean_age=Avg('authors__age'))
self.assertEqual(
list(books), [
{
"contact_id": self.a1.id,
"id": self.b1.id,
"isbn": "159059725",
"mean_age": 34.5,
"name": "The Definitive Guide to Django: Web Development Done Right",
"pages": 447,
"price": Approximate(Decimal("30")),
"pubdate": datetime.date(2007, 12, 6),
"publisher_id": self.p1.id,
"rating": 4.5,
}
]
)
books = (
Book.objects
.values("rating")
.annotate(n_authors=Count("authors__id"), mean_age=Avg("authors__age"))
.order_by("rating")
)
self.assertEqual(
list(books), [
{
"rating": 3.0,
"n_authors": 1,
"mean_age": 45.0,
},
{
"rating": 4.0,
"n_authors": 6,
"mean_age": Approximate(37.16, places=1)
},
{
"rating": 4.5,
"n_authors": 2,
"mean_age": 34.5,
},
{
"rating": 5.0,
"n_authors": 1,
"mean_age": 57.0,
}
]
)
authors = Author.objects.annotate(Avg("friends__age")).order_by("name")
self.assertQuerysetEqual(
authors, [
('Adrian Holovaty', 32.0),
('Brad Dayley', None),
('Jacob Kaplan-Moss', 29.5),
('James Bennett', 34.0),
('Jeffrey Forcier', 27.0),
('Paul Bissex', 31.0),
('Peter Norvig', 46.0),
('Stuart Russell', 57.0),
('Wesley J. Chun', Approximate(33.66, places=1))
],
lambda a: (a.name, a.friends__age__avg)
)
def test_count(self):
vals = Book.objects.aggregate(Count("rating"))
self.assertEqual(vals, {"rating__count": 6})
def test_count_star(self):
with self.assertNumQueries(1) as ctx:
Book.objects.aggregate(n=Count("*"))
sql = ctx.captured_queries[0]['sql']
self.assertIn('SELECT COUNT(*) ', sql)
def test_count_distinct_expression(self):
aggs = Book.objects.aggregate(
distinct_ratings=Count(Case(When(pages__gt=300, then='rating')), distinct=True),
)
self.assertEqual(aggs['distinct_ratings'], 4)
def test_distinct_on_aggregate(self):
for aggregate, expected_result in (
(Avg, 4.125),
(Count, 4),
(Sum, 16.5),
):
with self.subTest(aggregate=aggregate.__name__):
books = Book.objects.aggregate(ratings=aggregate('rating', distinct=True))
self.assertEqual(books['ratings'], expected_result)
def test_non_grouped_annotation_not_in_group_by(self):
"""
An annotation not included in values() before an aggregate should be
excluded from the group by clause.
"""
qs = (
Book.objects.annotate(xprice=F('price')).filter(rating=4.0).values('rating')
.annotate(count=Count('publisher_id', distinct=True)).values('count', 'rating').order_by('count')
)
self.assertEqual(list(qs), [{'rating': 4.0, 'count': 2}])
def test_grouped_annotation_in_group_by(self):
"""
An annotation included in values() before an aggregate should be
included in the group by clause.
"""
qs = (
Book.objects.annotate(xprice=F('price')).filter(rating=4.0).values('rating', 'xprice')
.annotate(count=Count('publisher_id', distinct=True)).values('count', 'rating').order_by('count')
)
self.assertEqual(
list(qs), [
{'rating': 4.0, 'count': 1},
{'rating': 4.0, 'count': 2},
]
)
def test_fkey_aggregate(self):
explicit = list(Author.objects.annotate(Count('book__id')))
implicit = list(Author.objects.annotate(Count('book')))
self.assertCountEqual(explicit, implicit)
def test_annotate_ordering(self):
books = Book.objects.values('rating').annotate(oldest=Max('authors__age')).order_by('oldest', 'rating')
self.assertEqual(
list(books), [
{'rating': 4.5, 'oldest': 35},
{'rating': 3.0, 'oldest': 45},
{'rating': 4.0, 'oldest': 57},
{'rating': 5.0, 'oldest': 57},
]
)
books = Book.objects.values("rating").annotate(oldest=Max("authors__age")).order_by("-oldest", "-rating")
self.assertEqual(
list(books), [
{'rating': 5.0, 'oldest': 57},
{'rating': 4.0, 'oldest': 57},
{'rating': 3.0, 'oldest': 45},
{'rating': 4.5, 'oldest': 35},
]
)
def test_aggregate_annotation(self):
vals = Book.objects.annotate(num_authors=Count("authors__id")).aggregate(Avg("num_authors"))
self.assertEqual(vals, {"num_authors__avg": Approximate(1.66, places=1)})
def test_avg_duration_field(self):
# Explicit `output_field`.
self.assertEqual(
Publisher.objects.aggregate(Avg('duration', output_field=DurationField())),
{'duration__avg': datetime.timedelta(days=1, hours=12)}
)
# Implicit `output_field`.
self.assertEqual(
Publisher.objects.aggregate(Avg('duration')),
{'duration__avg': datetime.timedelta(days=1, hours=12)}
)
def test_sum_duration_field(self):
self.assertEqual(
Publisher.objects.aggregate(Sum('duration', output_field=DurationField())),
{'duration__sum': datetime.timedelta(days=3)}
)
def test_sum_distinct_aggregate(self):
"""
Sum on a distinct() QuerySet should aggregate only the distinct items.
"""
authors = Author.objects.filter(book__in=[self.b5, self.b6])
self.assertEqual(authors.count(), 3)
distinct_authors = authors.distinct()
self.assertEqual(distinct_authors.count(), 2)
# Selected author ages are 57 and 46
age_sum = distinct_authors.aggregate(Sum('age'))
self.assertEqual(age_sum['age__sum'], 103)
def test_filtering(self):
p = Publisher.objects.create(name='Expensive Publisher', num_awards=0)
Book.objects.create(
name='ExpensiveBook1',
pages=1,
isbn='111',
rating=3.5,
price=Decimal("1000"),
publisher=p,
contact_id=self.a1.id,
pubdate=datetime.date(2008, 12, 1)
)
Book.objects.create(
name='ExpensiveBook2',
pages=1,
isbn='222',
rating=4.0,
price=Decimal("1000"),
publisher=p,
contact_id=self.a1.id,
pubdate=datetime.date(2008, 12, 2)
)
Book.objects.create(
name='ExpensiveBook3',
pages=1,
isbn='333',
rating=4.5,
price=Decimal("35"),
publisher=p,
contact_id=self.a1.id,
pubdate=datetime.date(2008, 12, 3)
)
publishers = Publisher.objects.annotate(num_books=Count("book__id")).filter(num_books__gt=1).order_by("pk")
self.assertQuerysetEqual(
publishers,
['Apress', 'Prentice Hall', 'Expensive Publisher'],
lambda p: p.name,
)
publishers = Publisher.objects.filter(book__price__lt=Decimal("40.0")).order_by("pk")
self.assertQuerysetEqual(
publishers, [
"Apress",
"Apress",
"Sams",
"Prentice Hall",
"Expensive Publisher",
],
lambda p: p.name
)
publishers = (
Publisher.objects
.annotate(num_books=Count("book__id"))
.filter(num_books__gt=1, book__price__lt=Decimal("40.0"))
.order_by("pk")
)
self.assertQuerysetEqual(
publishers,
['Apress', 'Prentice Hall', 'Expensive Publisher'],
lambda p: p.name,
)
publishers = (
Publisher.objects
.filter(book__price__lt=Decimal("40.0"))
.annotate(num_books=Count("book__id"))
.filter(num_books__gt=1)
.order_by("pk")
)
self.assertQuerysetEqual(publishers, ['Apress'], lambda p: p.name)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__range=[1, 3]).order_by("pk")
self.assertQuerysetEqual(
publishers, [
"Apress",
"Sams",
"Prentice Hall",
"Morgan Kaufmann",
"Expensive Publisher",
],
lambda p: p.name
)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__range=[1, 2]).order_by("pk")
self.assertQuerysetEqual(
publishers,
['Apress', 'Sams', 'Prentice Hall', 'Morgan Kaufmann'],
lambda p: p.name
)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__in=[1, 3]).order_by("pk")
self.assertQuerysetEqual(
publishers,
['Sams', 'Morgan Kaufmann', 'Expensive Publisher'],
lambda p: p.name,
)
publishers = Publisher.objects.annotate(num_books=Count("book")).filter(num_books__isnull=True)
self.assertEqual(len(publishers), 0)
def test_annotation(self):
vals = Author.objects.filter(pk=self.a1.pk).aggregate(Count("friends__id"))
self.assertEqual(vals, {"friends__id__count": 2})
books = Book.objects.annotate(num_authors=Count("authors__name")).filter(num_authors__exact=2).order_by("pk")
self.assertQuerysetEqual(
books, [
"The Definitive Guide to Django: Web Development Done Right",
"Artificial Intelligence: A Modern Approach",
],
lambda b: b.name
)
authors = (
Author.objects
.annotate(num_friends=Count("friends__id", distinct=True))
.filter(num_friends=0)
.order_by("pk")
)
self.assertQuerysetEqual(authors, ['Brad Dayley'], lambda a: a.name)
publishers = Publisher.objects.annotate(num_books=Count("book__id")).filter(num_books__gt=1).order_by("pk")
self.assertQuerysetEqual(publishers, ['Apress', 'Prentice Hall'], lambda p: p.name)
publishers = (
Publisher.objects
.filter(book__price__lt=Decimal("40.0"))
.annotate(num_books=Count("book__id"))
.filter(num_books__gt=1)
)
self.assertQuerysetEqual(publishers, ['Apress'], lambda p: p.name)
books = (
Book.objects
.annotate(num_authors=Count("authors__id"))
.filter(authors__name__contains="Norvig", num_authors__gt=1)
)
self.assertQuerysetEqual(
books,
['Artificial Intelligence: A Modern Approach'],
lambda b: b.name
)
def test_more_aggregation(self):
a = Author.objects.get(name__contains='Norvig')
b = Book.objects.get(name__contains='Done Right')
b.authors.add(a)
b.save()
vals = (
Book.objects
.annotate(num_authors=Count("authors__id"))
.filter(authors__name__contains="Norvig", num_authors__gt=1)
.aggregate(Avg("rating"))
)
self.assertEqual(vals, {"rating__avg": 4.25})
def test_even_more_aggregate(self):
publishers = Publisher.objects.annotate(
earliest_book=Min("book__pubdate"),
).exclude(earliest_book=None).order_by("earliest_book").values(
'earliest_book',
'num_awards',
'id',
'name',
)
self.assertEqual(
list(publishers), [
{
'earliest_book': datetime.date(1991, 10, 15),
'num_awards': 9,
'id': self.p4.id,
'name': 'Morgan Kaufmann'
},
{
'earliest_book': datetime.date(1995, 1, 15),
'num_awards': 7,
'id': self.p3.id,
'name': 'Prentice Hall'
},
{
'earliest_book': datetime.date(2007, 12, 6),
'num_awards': 3,
'id': self.p1.id,
'name': 'Apress'
},
{
'earliest_book': datetime.date(2008, 3, 3),
'num_awards': 1,
'id': self.p2.id,
'name': 'Sams'
}
]
)
vals = Store.objects.aggregate(Max("friday_night_closing"), Min("original_opening"))
self.assertEqual(
vals,
{
"friday_night_closing__max": datetime.time(23, 59, 59),
"original_opening__min": datetime.datetime(1945, 4, 25, 16, 24, 14),
}
)
def test_annotate_values_list(self):
books = (
Book.objects
.filter(pk=self.b1.pk)
.annotate(mean_age=Avg("authors__age"))
.values_list("pk", "isbn", "mean_age")
)
self.assertEqual(list(books), [(self.b1.id, '159059725', 34.5)])
books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values_list("isbn")
self.assertEqual(list(books), [('159059725',)])
books = Book.objects.filter(pk=self.b1.pk).annotate(mean_age=Avg("authors__age")).values_list("mean_age")
self.assertEqual(list(books), [(34.5,)])
books = (
Book.objects
.filter(pk=self.b1.pk)
.annotate(mean_age=Avg("authors__age"))
.values_list("mean_age", flat=True)
)
self.assertEqual(list(books), [34.5])
books = Book.objects.values_list("price").annotate(count=Count("price")).order_by("-count", "price")
self.assertEqual(
list(books), [
(Decimal("29.69"), 2),
(Decimal('23.09'), 1),
(Decimal('30'), 1),
(Decimal('75'), 1),
(Decimal('82.8'), 1),
]
)
def test_dates_with_aggregation(self):
"""
.dates() returns a distinct set of dates when applied to a
QuerySet with aggregation.
Refs #18056. Previously, .dates() would return distinct (date_kind,
aggregation) sets, in this case (year, num_authors), so 2008 would be
returned twice because there are books from 2008 with a different
number of authors.
"""
dates = Book.objects.annotate(num_authors=Count("authors")).dates('pubdate', 'year')
self.assertQuerysetEqual(
dates, [
"datetime.date(1991, 1, 1)",
"datetime.date(1995, 1, 1)",
"datetime.date(2007, 1, 1)",
"datetime.date(2008, 1, 1)"
]
)
def test_values_aggregation(self):
# Refs #20782
max_rating = Book.objects.values('rating').aggregate(max_rating=Max('rating'))
self.assertEqual(max_rating['max_rating'], 5)
max_books_per_rating = Book.objects.values('rating').annotate(
books_per_rating=Count('id')
).aggregate(Max('books_per_rating'))
self.assertEqual(
max_books_per_rating,
{'books_per_rating__max': 3})
def test_ticket17424(self):
"""
Doing exclude() on a foreign model after annotate() doesn't crash.
"""
all_books = list(Book.objects.values_list('pk', flat=True).order_by('pk'))
annotated_books = Book.objects.order_by('pk').annotate(one=Count("id"))
# The value doesn't matter, we just need any negative
# constraint on a related model that's a noop.
excluded_books = annotated_books.exclude(publisher__name="__UNLIKELY_VALUE__")
# Try to generate query tree
str(excluded_books.query)
self.assertQuerysetEqual(excluded_books, all_books, lambda x: x.pk)
# Check internal state
self.assertIsNone(annotated_books.query.alias_map["aggregation_book"].join_type)
self.assertIsNone(excluded_books.query.alias_map["aggregation_book"].join_type)
def test_ticket12886(self):
"""
Aggregation over sliced queryset works correctly.
"""
qs = Book.objects.all().order_by('-rating')[0:3]
vals = qs.aggregate(average_top3_rating=Avg('rating'))['average_top3_rating']
self.assertAlmostEqual(vals, 4.5, places=2)
def test_ticket11881(self):
"""
Subqueries do not needlessly contain ORDER BY, SELECT FOR UPDATE or
select_related() stuff.
"""
qs = Book.objects.all().select_for_update().order_by(
'pk').select_related('publisher').annotate(max_pk=Max('pk'))
with CaptureQueriesContext(connection) as captured_queries:
qs.aggregate(avg_pk=Avg('max_pk'))
self.assertEqual(len(captured_queries), 1)
qstr = captured_queries[0]['sql'].lower()
self.assertNotIn('for update', qstr)
forced_ordering = connection.ops.force_no_ordering()
if forced_ordering:
# If the backend needs to force an ordering we make sure it's
# the only "ORDER BY" clause present in the query.
self.assertEqual(
re.findall(r'order by (\w+)', qstr),
[', '.join(f[1][0] for f in forced_ordering).lower()]
)
else:
self.assertNotIn('order by', qstr)
self.assertEqual(qstr.count(' join '), 0)
def test_decimal_max_digits_has_no_effect(self):
Book.objects.all().delete()
a1 = Author.objects.first()
p1 = Publisher.objects.first()
thedate = timezone.now()
for i in range(10):
Book.objects.create(
isbn="abcde{}".format(i), name="none", pages=10, rating=4.0,
price=9999.98, contact=a1, publisher=p1, pubdate=thedate)
book = Book.objects.aggregate(price_sum=Sum('price'))
self.assertEqual(book['price_sum'], Decimal("99999.80"))
def test_nonaggregate_aggregation_throws(self):
with self.assertRaisesMessage(TypeError, 'fail is not an aggregate expression'):
Book.objects.aggregate(fail=F('price'))
def test_nonfield_annotation(self):
book = Book.objects.annotate(val=Max(Value(2, output_field=IntegerField()))).first()
self.assertEqual(book.val, 2)
book = Book.objects.annotate(val=Max(Value(2), output_field=IntegerField())).first()
self.assertEqual(book.val, 2)
book = Book.objects.annotate(val=Max(2, output_field=IntegerField())).first()
self.assertEqual(book.val, 2)
def test_missing_output_field_raises_error(self):
with self.assertRaisesMessage(FieldError, 'Cannot resolve expression type, unknown output_field'):
Book.objects.annotate(val=Max(2)).first()
def test_annotation_expressions(self):
authors = Author.objects.annotate(combined_ages=Sum(F('age') + F('friends__age'))).order_by('name')
authors2 = Author.objects.annotate(combined_ages=Sum('age') + Sum('friends__age')).order_by('name')
for qs in (authors, authors2):
self.assertQuerysetEqual(
qs, [
('Adrian Holovaty', 132),
('Brad Dayley', None),
('Jacob Kaplan-Moss', 129),
('James Bennett', 63),
('Jeffrey Forcier', 128),
('Paul Bissex', 120),
('Peter Norvig', 103),
('Stuart Russell', 103),
('Wesley J. Chun', 176)
],
lambda a: (a.name, a.combined_ages)
)
def test_aggregation_expressions(self):
a1 = Author.objects.aggregate(av_age=Sum('age') / Count('*'))
a2 = Author.objects.aggregate(av_age=Sum('age') / Count('age'))
a3 = Author.objects.aggregate(av_age=Avg('age'))
self.assertEqual(a1, {'av_age': 37})
self.assertEqual(a2, {'av_age': 37})
self.assertEqual(a3, {'av_age': Approximate(37.4, places=1)})
def test_avg_decimal_field(self):
v = Book.objects.filter(rating=4).aggregate(avg_price=(Avg('price')))['avg_price']
self.assertIsInstance(v, Decimal)
self.assertEqual(v, Approximate(Decimal('47.39'), places=2))
def test_order_of_precedence(self):
p1 = Book.objects.filter(rating=4).aggregate(avg_price=(Avg('price') + 2) * 3)
self.assertEqual(p1, {'avg_price': Approximate(Decimal('148.18'), places=2)})
p2 = Book.objects.filter(rating=4).aggregate(avg_price=Avg('price') + 2 * 3)
self.assertEqual(p2, {'avg_price': Approximate(Decimal('53.39'), places=2)})
def test_combine_different_types(self):
msg = (
'Expression contains mixed types: FloatField, IntegerField. '
'You must set output_field.'
)
qs = Book.objects.annotate(sums=Sum('rating') + Sum('pages') + Sum('price'))
with self.assertRaisesMessage(FieldError, msg):
qs.first()
with self.assertRaisesMessage(FieldError, msg):
qs.first()
b1 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'),
output_field=IntegerField())).get(pk=self.b4.pk)
self.assertEqual(b1.sums, 383)
b2 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'),
output_field=FloatField())).get(pk=self.b4.pk)
self.assertEqual(b2.sums, 383.69)
b3 = Book.objects.annotate(sums=Sum(F('rating') + F('pages') + F('price'),
output_field=DecimalField())).get(pk=self.b4.pk)
self.assertEqual(b3.sums, Approximate(Decimal("383.69"), places=2))
def test_complex_aggregations_require_kwarg(self):
with self.assertRaisesMessage(TypeError, 'Complex annotations require an alias'):
Author.objects.annotate(Sum(F('age') + F('friends__age')))
with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'):
Author.objects.aggregate(Sum('age') / Count('age'))
with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'):
Author.objects.aggregate(Sum(1))
def test_aggregate_over_complex_annotation(self):
qs = Author.objects.annotate(
combined_ages=Sum(F('age') + F('friends__age')))
age = qs.aggregate(max_combined_age=Max('combined_ages'))
self.assertEqual(age['max_combined_age'], 176)
age = qs.aggregate(max_combined_age_doubled=Max('combined_ages') * 2)
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
age = qs.aggregate(
max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'))
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
age = qs.aggregate(
max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'),
sum_combined_age=Sum('combined_ages'))
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
self.assertEqual(age['sum_combined_age'], 954)
age = qs.aggregate(
max_combined_age_doubled=Max('combined_ages') + Max('combined_ages'),
sum_combined_age_doubled=Sum('combined_ages') + Sum('combined_ages'))
self.assertEqual(age['max_combined_age_doubled'], 176 * 2)
self.assertEqual(age['sum_combined_age_doubled'], 954 * 2)
def test_values_annotation_with_expression(self):
# ensure the F() is promoted to the group by clause
qs = Author.objects.values('name').annotate(another_age=Sum('age') + F('age'))
a = qs.get(name="Adrian Holovaty")
self.assertEqual(a['another_age'], 68)
qs = qs.annotate(friend_count=Count('friends'))
a = qs.get(name="Adrian Holovaty")
self.assertEqual(a['friend_count'], 2)
qs = qs.annotate(combined_age=Sum('age') + F('friends__age')).filter(
name="Adrian Holovaty").order_by('-combined_age')
self.assertEqual(
list(qs), [
{
"name": 'Adrian Holovaty',
"another_age": 68,
"friend_count": 1,
"combined_age": 69
},
{
"name": 'Adrian Holovaty',
"another_age": 68,
"friend_count": 1,
"combined_age": 63
}
]
)
vals = qs.values('name', 'combined_age')
self.assertEqual(
list(vals), [
{'name': 'Adrian Holovaty', 'combined_age': 69},
{'name': 'Adrian Holovaty', 'combined_age': 63},
]
)
def test_annotate_values_aggregate(self):
alias_age = Author.objects.annotate(
age_alias=F('age')
).values(
'age_alias',
).aggregate(sum_age=Sum('age_alias'))
age = Author.objects.values('age').aggregate(sum_age=Sum('age'))
self.assertEqual(alias_age['sum_age'], age['sum_age'])
def test_annotate_over_annotate(self):
author = Author.objects.annotate(
age_alias=F('age')
).annotate(
sum_age=Sum('age_alias')
).get(name="Adrian Holovaty")
other_author = Author.objects.annotate(
sum_age=Sum('age')
).get(name="Adrian Holovaty")
self.assertEqual(author.sum_age, other_author.sum_age)
def test_annotated_aggregate_over_annotated_aggregate(self):
with self.assertRaisesMessage(FieldError, "Cannot compute Sum('id__max'): 'id__max' is an aggregate"):
Book.objects.annotate(Max('id')).annotate(Sum('id__max'))
class MyMax(Max):
def as_sql(self, compiler, connection):
self.set_source_expressions(self.get_source_expressions()[0:1])
return super().as_sql(compiler, connection)
with self.assertRaisesMessage(FieldError, "Cannot compute Max('id__max'): 'id__max' is an aggregate"):
Book.objects.annotate(Max('id')).annotate(my_max=MyMax('id__max', 'price'))
def test_multi_arg_aggregate(self):
class MyMax(Max):
output_field = DecimalField()
def as_sql(self, compiler, connection):
copy = self.copy()
copy.set_source_expressions(copy.get_source_expressions()[0:1])
return super(MyMax, copy).as_sql(compiler, connection)
with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'):
Book.objects.aggregate(MyMax('pages', 'price'))
with self.assertRaisesMessage(TypeError, 'Complex annotations require an alias'):
Book.objects.annotate(MyMax('pages', 'price'))
Book.objects.aggregate(max_field=MyMax('pages', 'price'))
def test_add_implementation(self):
class MySum(Sum):
pass
# test completely changing how the output is rendered
def lower_case_function_override(self, compiler, connection):
sql, params = compiler.compile(self.source_expressions[0])
substitutions = {'function': self.function.lower(), 'expressions': sql, 'distinct': ''}
substitutions.update(self.extra)
return self.template % substitutions, params
setattr(MySum, 'as_' + connection.vendor, lower_case_function_override)
qs = Book.objects.annotate(
sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField())
)
self.assertEqual(str(qs.query).count('sum('), 1)
b1 = qs.get(pk=self.b4.pk)
self.assertEqual(b1.sums, 383)
# test changing the dict and delegating
def lower_case_function_super(self, compiler, connection):
self.extra['function'] = self.function.lower()
return super(MySum, self).as_sql(compiler, connection)
setattr(MySum, 'as_' + connection.vendor, lower_case_function_super)
qs = Book.objects.annotate(
sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField())
)
self.assertEqual(str(qs.query).count('sum('), 1)
b1 = qs.get(pk=self.b4.pk)
self.assertEqual(b1.sums, 383)
# test overriding all parts of the template
def be_evil(self, compiler, connection):
substitutions = {'function': 'MAX', 'expressions': '2', 'distinct': ''}
substitutions.update(self.extra)
return self.template % substitutions, ()
setattr(MySum, 'as_' + connection.vendor, be_evil)
qs = Book.objects.annotate(
sums=MySum(F('rating') + F('pages') + F('price'), output_field=IntegerField())
)
self.assertEqual(str(qs.query).count('MAX('), 1)
b1 = qs.get(pk=self.b4.pk)
self.assertEqual(b1.sums, 2)
def test_complex_values_aggregation(self):
max_rating = Book.objects.values('rating').aggregate(
double_max_rating=Max('rating') + Max('rating'))
self.assertEqual(max_rating['double_max_rating'], 5 * 2)
max_books_per_rating = Book.objects.values('rating').annotate(
books_per_rating=Count('id') + 5
).aggregate(Max('books_per_rating'))
self.assertEqual(
max_books_per_rating,
{'books_per_rating__max': 3 + 5})
def test_expression_on_aggregation(self):
# Create a plain expression
class Greatest(Func):
function = 'GREATEST'
def as_sqlite(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, function='MAX', **extra_context)
qs = Publisher.objects.annotate(
price_or_median=Greatest(Avg('book__rating', output_field=DecimalField()), Avg('book__price'))
).filter(price_or_median__gte=F('num_awards')).order_by('num_awards')
self.assertQuerysetEqual(
qs, [1, 3, 7, 9], lambda v: v.num_awards)
qs2 = Publisher.objects.annotate(
rating_or_num_awards=Greatest(Avg('book__rating'), F('num_awards'),
output_field=FloatField())
).filter(rating_or_num_awards__gt=F('num_awards')).order_by('num_awards')
self.assertQuerysetEqual(
qs2, [1, 3], lambda v: v.num_awards)
def test_arguments_must_be_expressions(self):
msg = 'QuerySet.aggregate() received non-expression(s): %s.'
with self.assertRaisesMessage(TypeError, msg % FloatField()):
Book.objects.aggregate(FloatField())
with self.assertRaisesMessage(TypeError, msg % True):
Book.objects.aggregate(is_book=True)
with self.assertRaisesMessage(TypeError, msg % ', '.join([str(FloatField()), 'True'])):
Book.objects.aggregate(FloatField(), Avg('price'), is_book=True)
def test_aggregation_subquery_annotation(self):
"""Subquery annotations are excluded from the GROUP BY if they are
not explicitly grouped against."""
latest_book_pubdate_qs = Book.objects.filter(
publisher=OuterRef('pk')
).order_by('-pubdate').values('pubdate')[:1]
publisher_qs = Publisher.objects.annotate(
latest_book_pubdate=Subquery(latest_book_pubdate_qs),
).annotate(count=Count('book'))
with self.assertNumQueries(1) as ctx:
list(publisher_qs)
self.assertEqual(ctx[0]['sql'].count('SELECT'), 2)
# The GROUP BY should not be by alias either.
self.assertEqual(ctx[0]['sql'].lower().count('latest_book_pubdate'), 1)
def test_aggregation_subquery_annotation_exists(self):
latest_book_pubdate_qs = Book.objects.filter(
publisher=OuterRef('pk')
).order_by('-pubdate').values('pubdate')[:1]
publisher_qs = Publisher.objects.annotate(
latest_book_pubdate=Subquery(latest_book_pubdate_qs),
count=Count('book'),
)
self.assertTrue(publisher_qs.exists())
def test_aggregation_exists_annotation(self):
published_books = Book.objects.filter(publisher=OuterRef('pk'))
publisher_qs = Publisher.objects.annotate(
published_book=Exists(published_books),
count=Count('book'),
).values_list('name', flat=True)
self.assertCountEqual(list(publisher_qs), [
'Apress',
'Morgan Kaufmann',
"Jonno's House of Books",
'Prentice Hall',
'Sams',
])
def test_aggregation_subquery_annotation_values(self):
"""
Subquery annotations and external aliases are excluded from the GROUP
BY if they are not selected.
"""
books_qs = Book.objects.annotate(
first_author_the_same_age=Subquery(
Author.objects.filter(
age=OuterRef('contact__friends__age'),
).order_by('age').values('id')[:1],
)
).filter(
publisher=self.p1,
first_author_the_same_age__isnull=False,
).annotate(
min_age=Min('contact__friends__age'),
).values('name', 'min_age').order_by('name')
self.assertEqual(list(books_qs), [
{'name': 'Practical Django Projects', 'min_age': 34},
{
'name': 'The Definitive Guide to Django: Web Development Done Right',
'min_age': 29,
},
])
def test_aggregation_order_by_not_selected_annotation_values(self):
result_asc = [
self.b4.pk,
self.b3.pk,
self.b1.pk,
self.b2.pk,
self.b5.pk,
self.b6.pk,
]
result_desc = result_asc[::-1]
tests = [
('min_related_age', result_asc),
('-min_related_age', result_desc),
(F('min_related_age'), result_asc),
(F('min_related_age').asc(), result_asc),
(F('min_related_age').desc(), result_desc),
]
for ordering, expected_result in tests:
with self.subTest(ordering=ordering):
books_qs = Book.objects.annotate(
min_age=Min('authors__age'),
).annotate(
min_related_age=Coalesce('min_age', 'contact__age'),
).order_by(ordering).values_list('pk', flat=True)
self.assertEqual(list(books_qs), expected_result)
@skipUnlessDBFeature('supports_subqueries_in_group_by')
def test_group_by_subquery_annotation(self):
"""
Subquery annotations are included in the GROUP BY if they are
grouped against.
"""
long_books_count_qs = Book.objects.filter(
publisher=OuterRef('pk'),
pages__gt=400,
).values(
'publisher'
).annotate(count=Count('pk')).values('count')
long_books_count_breakdown = Publisher.objects.values_list(
Subquery(long_books_count_qs, IntegerField()),
).annotate(total=Count('*'))
self.assertEqual(dict(long_books_count_breakdown), {None: 1, 1: 4})
@skipUnlessDBFeature('supports_subqueries_in_group_by')
def test_group_by_exists_annotation(self):
"""
Exists annotations are included in the GROUP BY if they are
grouped against.
"""
long_books_qs = Book.objects.filter(
publisher=OuterRef('pk'),
pages__gt=800,
)
has_long_books_breakdown = Publisher.objects.values_list(
Exists(long_books_qs),
).annotate(total=Count('*'))
self.assertEqual(dict(has_long_books_breakdown), {True: 2, False: 3})
def test_aggregation_subquery_annotation_related_field(self):
publisher = Publisher.objects.create(name=self.a9.name, num_awards=2)
book = Book.objects.create(
isbn='159059999', name='Test book.', pages=819, rating=2.5,
price=Decimal('14.44'), contact=self.a9, publisher=publisher,
pubdate=datetime.date(2019, 12, 6),
)
book.authors.add(self.a5, self.a6, self.a7)
books_qs = Book.objects.annotate(
contact_publisher=Subquery(
Publisher.objects.filter(
pk=OuterRef('publisher'),
name=OuterRef('contact__name'),
).values('name')[:1],
)
).filter(
contact_publisher__isnull=False,
).annotate(count=Count('authors'))
self.assertSequenceEqual(books_qs, [book])
|
7f954585af10f5e52f297c9a080d919065fa9527b8f57e166f55a70ef7ff9d37 | import datetime
from django.core import signing
from django.test import SimpleTestCase
from django.test.utils import freeze_time
class TestSigner(SimpleTestCase):
def test_signature(self):
"signature() method should generate a signature"
signer = signing.Signer('predictable-secret')
signer2 = signing.Signer('predictable-secret2')
for s in (
b'hello',
b'3098247:529:087:',
'\u2019'.encode(),
):
self.assertEqual(
signer.signature(s),
signing.base64_hmac(signer.salt + 'signer', s, 'predictable-secret')
)
self.assertNotEqual(signer.signature(s), signer2.signature(s))
def test_signature_with_salt(self):
"signature(value, salt=...) should work"
signer = signing.Signer('predictable-secret', salt='extra-salt')
self.assertEqual(
signer.signature('hello'),
signing.base64_hmac('extra-salt' + 'signer', 'hello', 'predictable-secret')
)
self.assertNotEqual(
signing.Signer('predictable-secret', salt='one').signature('hello'),
signing.Signer('predictable-secret', salt='two').signature('hello'))
def test_sign_unsign(self):
"sign/unsign should be reversible"
signer = signing.Signer('predictable-secret')
examples = [
'q;wjmbk;wkmb',
'3098247529087',
'3098247:529:087:',
'jkw osanteuh ,rcuh nthu aou oauh ,ud du',
'\u2019',
]
for example in examples:
signed = signer.sign(example)
self.assertIsInstance(signed, str)
self.assertNotEqual(example, signed)
self.assertEqual(example, signer.unsign(signed))
def test_sign_unsign_non_string(self):
signer = signing.Signer('predictable-secret')
values = [
123,
1.23,
True,
datetime.date.today(),
]
for value in values:
with self.subTest(value):
signed = signer.sign(value)
self.assertIsInstance(signed, str)
self.assertNotEqual(signed, value)
self.assertEqual(signer.unsign(signed), str(value))
def test_unsign_detects_tampering(self):
"unsign should raise an exception if the value has been tampered with"
signer = signing.Signer('predictable-secret')
value = 'Another string'
signed_value = signer.sign(value)
transforms = (
lambda s: s.upper(),
lambda s: s + 'a',
lambda s: 'a' + s[1:],
lambda s: s.replace(':', ''),
)
self.assertEqual(value, signer.unsign(signed_value))
for transform in transforms:
with self.assertRaises(signing.BadSignature):
signer.unsign(transform(signed_value))
def test_dumps_loads(self):
"dumps and loads be reversible for any JSON serializable object"
objects = [
['a', 'list'],
'a string \u2019',
{'a': 'dictionary'},
]
for o in objects:
self.assertNotEqual(o, signing.dumps(o))
self.assertEqual(o, signing.loads(signing.dumps(o)))
self.assertNotEqual(o, signing.dumps(o, compress=True))
self.assertEqual(o, signing.loads(signing.dumps(o, compress=True)))
def test_decode_detects_tampering(self):
"loads should raise exception for tampered objects"
transforms = (
lambda s: s.upper(),
lambda s: s + 'a',
lambda s: 'a' + s[1:],
lambda s: s.replace(':', ''),
)
value = {
'foo': 'bar',
'baz': 1,
}
encoded = signing.dumps(value)
self.assertEqual(value, signing.loads(encoded))
for transform in transforms:
with self.assertRaises(signing.BadSignature):
signing.loads(transform(encoded))
def test_works_with_non_ascii_keys(self):
binary_key = b'\xe7' # Set some binary (non-ASCII key)
s = signing.Signer(binary_key)
self.assertEqual('foo:6NB0fssLW5RQvZ3Y-MTerq2rX7w', s.sign('foo'))
def test_valid_sep(self):
separators = ['/', '*sep*', ',']
for sep in separators:
signer = signing.Signer('predictable-secret', sep=sep)
self.assertEqual('foo%ssH9B01cZcJ9FoT_jEVkRkNULrl8' % sep, signer.sign('foo'))
def test_invalid_sep(self):
"""should warn on invalid separator"""
msg = 'Unsafe Signer separator: %r (cannot be empty or consist of only A-z0-9-_=)'
separators = ['', '-', 'abc']
for sep in separators:
with self.assertRaisesMessage(ValueError, msg % sep):
signing.Signer(sep=sep)
class TestTimestampSigner(SimpleTestCase):
def test_timestamp_signer(self):
value = 'hello'
with freeze_time(123456789):
signer = signing.TimestampSigner('predictable-key')
ts = signer.sign(value)
self.assertNotEqual(ts, signing.Signer('predictable-key').sign(value))
self.assertEqual(signer.unsign(ts), value)
with freeze_time(123456800):
self.assertEqual(signer.unsign(ts, max_age=12), value)
# max_age parameter can also accept a datetime.timedelta object
self.assertEqual(signer.unsign(ts, max_age=datetime.timedelta(seconds=11)), value)
with self.assertRaises(signing.SignatureExpired):
signer.unsign(ts, max_age=10)
|
ea81564fd2ab214a5fd73fe7f67414b96dda2d33155831eece4380f6334db59a | from django.contrib.contenttypes.fields import (
GenericForeignKey, GenericRelation,
)
from django.contrib.contenttypes.models import ContentType
from django.db import models
__all__ = ('Link', 'Place', 'Restaurant', 'Person', 'Address',
'CharLink', 'TextLink', 'OddRelation1', 'OddRelation2',
'Contact', 'Organization', 'Note', 'Company')
class Link(models.Model):
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey()
def __str__(self):
return "Link to %s id=%s" % (self.content_type, self.object_id)
class LinkProxy(Link):
class Meta:
proxy = True
class Place(models.Model):
name = models.CharField(max_length=100)
links = GenericRelation(Link, related_query_name='places')
link_proxy = GenericRelation(LinkProxy)
def __str__(self):
return "Place: %s" % self.name
class Restaurant(Place):
def __str__(self):
return "Restaurant: %s" % self.name
class Cafe(Restaurant):
def __str__(self):
return "Cafe: %s" % self.name
class Address(models.Model):
street = models.CharField(max_length=80)
city = models.CharField(max_length=50)
state = models.CharField(max_length=2)
zipcode = models.CharField(max_length=5)
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey()
def __str__(self):
return '%s %s, %s %s' % (self.street, self.city, self.state, self.zipcode)
class Person(models.Model):
account = models.IntegerField(primary_key=True)
name = models.CharField(max_length=128)
addresses = GenericRelation(Address)
def __str__(self):
return self.name
class CharLink(models.Model):
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.CharField(max_length=100)
content_object = GenericForeignKey()
class TextLink(models.Model):
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.TextField()
content_object = GenericForeignKey()
class OddRelation1(models.Model):
name = models.CharField(max_length=100)
clinks = GenericRelation(CharLink)
class OddRelation2(models.Model):
name = models.CharField(max_length=100)
tlinks = GenericRelation(TextLink)
# models for test_q_object_or:
class Note(models.Model):
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey()
note = models.TextField()
class Contact(models.Model):
notes = GenericRelation(Note)
class Organization(models.Model):
name = models.CharField(max_length=255)
contacts = models.ManyToManyField(Contact, related_name='organizations')
class Company(models.Model):
name = models.CharField(max_length=100)
links = GenericRelation(Link)
def __str__(self):
return "Company: %s" % self.name
# For testing #13085 fix, we also use Note model defined above
class Developer(models.Model):
name = models.CharField(max_length=15)
class Team(models.Model):
name = models.CharField(max_length=15)
members = models.ManyToManyField(Developer)
def __str__(self):
return "%s team" % self.name
def __len__(self):
return self.members.count()
class Guild(models.Model):
name = models.CharField(max_length=15)
members = models.ManyToManyField(Developer)
def __bool__(self):
return False
class Tag(models.Model):
content_type = models.ForeignKey(ContentType, models.CASCADE, related_name='g_r_r_tags')
object_id = models.CharField(max_length=15)
content_object = GenericForeignKey()
label = models.CharField(max_length=15)
class Board(models.Model):
name = models.CharField(primary_key=True, max_length=15)
class SpecialGenericRelation(GenericRelation):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.editable = True
self.save_form_data_calls = 0
def save_form_data(self, *args, **kwargs):
self.save_form_data_calls += 1
class HasLinks(models.Model):
links = SpecialGenericRelation(Link, related_query_name='targets')
class Meta:
abstract = True
class HasLinkThing(HasLinks):
pass
class A(models.Model):
flag = models.BooleanField(null=True)
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey('content_type', 'object_id')
class B(models.Model):
a = GenericRelation(A)
class Meta:
ordering = ('id',)
class C(models.Model):
b = models.ForeignKey(B, models.CASCADE)
class Meta:
ordering = ('id',)
class D(models.Model):
b = models.ForeignKey(B, models.SET_NULL, null=True)
class Meta:
ordering = ('id',)
# Ticket #22998
class Node(models.Model):
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.PositiveIntegerField()
content = GenericForeignKey('content_type', 'object_id')
class Content(models.Model):
nodes = GenericRelation(Node)
related_obj = models.ForeignKey('Related', models.CASCADE)
class Related(models.Model):
pass
def prevent_deletes(sender, instance, **kwargs):
raise models.ProtectedError("Not allowed to delete.", [instance])
models.signals.pre_delete.connect(prevent_deletes, sender=Node)
|
e9921be49ed128e871c6aa88c4656db04fb63956a539f2c4a27afe21052c5683 | """
Test PostgreSQL full text search.
These tests use dialogue from the 1975 film Monty Python and the Holy Grail.
All text copyright Python (Monty) Pictures. Thanks to sacred-texts.com for the
transcript.
"""
from django.contrib.postgres.search import (
SearchQuery, SearchRank, SearchVector,
)
from django.db import connection
from django.db.models import F
from django.test import SimpleTestCase, modify_settings, skipUnlessDBFeature
from . import PostgreSQLTestCase
from .models import Character, Line, Scene
class GrailTestData:
@classmethod
def setUpTestData(cls):
cls.robin = Scene.objects.create(scene='Scene 10', setting='The dark forest of Ewing')
cls.minstrel = Character.objects.create(name='Minstrel')
verses = [
(
'Bravely bold Sir Robin, rode forth from Camelot. '
'He was not afraid to die, o Brave Sir Robin. '
'He was not at all afraid to be killed in nasty ways. '
'Brave, brave, brave, brave Sir Robin!'
),
(
'He was not in the least bit scared to be mashed into a pulp, '
'Or to have his eyes gouged out, and his elbows broken. '
'To have his kneecaps split, and his body burned away, '
'And his limbs all hacked and mangled, brave Sir Robin!'
),
(
'His head smashed in and his heart cut out, '
'And his liver removed and his bowels unplugged, '
'And his nostrils ripped and his bottom burned off,'
'And his --'
),
]
cls.verses = [Line.objects.create(
scene=cls.robin,
character=cls.minstrel,
dialogue=verse,
) for verse in verses]
cls.verse0, cls.verse1, cls.verse2 = cls.verses
cls.witch_scene = Scene.objects.create(scene='Scene 5', setting="Sir Bedemir's Castle")
bedemir = Character.objects.create(name='Bedemir')
crowd = Character.objects.create(name='Crowd')
witch = Character.objects.create(name='Witch')
duck = Character.objects.create(name='Duck')
cls.bedemir0 = Line.objects.create(
scene=cls.witch_scene,
character=bedemir,
dialogue='We shall use my larger scales!',
dialogue_config='english',
)
cls.bedemir1 = Line.objects.create(
scene=cls.witch_scene,
character=bedemir,
dialogue='Right, remove the supports!',
dialogue_config='english',
)
cls.duck = Line.objects.create(scene=cls.witch_scene, character=duck, dialogue=None)
cls.crowd = Line.objects.create(scene=cls.witch_scene, character=crowd, dialogue='A witch! A witch!')
cls.witch = Line.objects.create(scene=cls.witch_scene, character=witch, dialogue="It's a fair cop.")
trojan_rabbit = Scene.objects.create(scene='Scene 8', setting="The castle of Our Master Ruiz' de lu la Ramper")
guards = Character.objects.create(name='French Guards')
cls.french = Line.objects.create(
scene=trojan_rabbit,
character=guards,
dialogue='Oh. Un beau cadeau. Oui oui.',
dialogue_config='french',
)
@modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
class SimpleSearchTest(GrailTestData, PostgreSQLTestCase):
def test_simple(self):
searched = Line.objects.filter(dialogue__search='elbows')
self.assertSequenceEqual(searched, [self.verse1])
def test_non_exact_match(self):
searched = Line.objects.filter(dialogue__search='hearts')
self.assertSequenceEqual(searched, [self.verse2])
def test_search_two_terms(self):
searched = Line.objects.filter(dialogue__search='heart bowel')
self.assertSequenceEqual(searched, [self.verse2])
def test_search_two_terms_with_partial_match(self):
searched = Line.objects.filter(dialogue__search='Robin killed')
self.assertSequenceEqual(searched, [self.verse0])
@modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
class SearchVectorFieldTest(GrailTestData, PostgreSQLTestCase):
def test_existing_vector(self):
Line.objects.update(dialogue_search_vector=SearchVector('dialogue'))
searched = Line.objects.filter(dialogue_search_vector=SearchQuery('Robin killed'))
self.assertSequenceEqual(searched, [self.verse0])
def test_existing_vector_config_explicit(self):
Line.objects.update(dialogue_search_vector=SearchVector('dialogue'))
searched = Line.objects.filter(dialogue_search_vector=SearchQuery('cadeaux', config='french'))
self.assertSequenceEqual(searched, [self.french])
def test_single_coalesce_expression(self):
searched = Line.objects.annotate(search=SearchVector('dialogue')).filter(search='cadeaux')
self.assertNotIn('COALESCE(COALESCE', str(searched.query))
class MultipleFieldsTest(GrailTestData, PostgreSQLTestCase):
def test_simple_on_dialogue(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search='elbows')
self.assertSequenceEqual(searched, [self.verse1])
def test_simple_on_scene(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search='Forest')
self.assertCountEqual(searched, self.verses)
def test_non_exact_match(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search='heart')
self.assertSequenceEqual(searched, [self.verse2])
def test_search_two_terms(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search='heart forest')
self.assertSequenceEqual(searched, [self.verse2])
def test_terms_adjacent(self):
searched = Line.objects.annotate(
search=SearchVector('character__name', 'dialogue'),
).filter(search='minstrel')
self.assertCountEqual(searched, self.verses)
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search='minstrelbravely')
self.assertSequenceEqual(searched, [])
def test_search_with_null(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search='bedemir')
self.assertCountEqual(searched, [self.bedemir0, self.bedemir1, self.crowd, self.witch, self.duck])
def test_search_with_non_text(self):
searched = Line.objects.annotate(
search=SearchVector('id'),
).filter(search=str(self.crowd.id))
self.assertSequenceEqual(searched, [self.crowd])
@skipUnlessDBFeature('has_phraseto_tsquery')
def test_phrase_search(self):
line_qs = Line.objects.annotate(search=SearchVector('dialogue'))
searched = line_qs.filter(search=SearchQuery('burned body his away', search_type='phrase'))
self.assertSequenceEqual(searched, [])
searched = line_qs.filter(search=SearchQuery('his body burned away', search_type='phrase'))
self.assertSequenceEqual(searched, [self.verse1])
@skipUnlessDBFeature('has_phraseto_tsquery')
def test_phrase_search_with_config(self):
line_qs = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue', config='french'),
)
searched = line_qs.filter(
search=SearchQuery('cadeau beau un', search_type='phrase', config='french'),
)
self.assertSequenceEqual(searched, [])
searched = line_qs.filter(
search=SearchQuery('un beau cadeau', search_type='phrase', config='french'),
)
self.assertSequenceEqual(searched, [self.french])
def test_raw_search(self):
line_qs = Line.objects.annotate(search=SearchVector('dialogue'))
searched = line_qs.filter(search=SearchQuery('Robin', search_type='raw'))
self.assertCountEqual(searched, [self.verse0, self.verse1])
searched = line_qs.filter(search=SearchQuery("Robin & !'Camelot'", search_type='raw'))
self.assertSequenceEqual(searched, [self.verse1])
def test_raw_search_with_config(self):
line_qs = Line.objects.annotate(search=SearchVector('dialogue', config='french'))
searched = line_qs.filter(
search=SearchQuery("'cadeaux' & 'beaux'", search_type='raw', config='french'),
)
self.assertSequenceEqual(searched, [self.french])
@skipUnlessDBFeature('has_websearch_to_tsquery')
def test_web_search(self):
line_qs = Line.objects.annotate(search=SearchVector('dialogue'))
searched = line_qs.filter(
search=SearchQuery(
'"burned body" "split kneecaps"',
search_type='websearch',
),
)
self.assertSequenceEqual(searched, [])
searched = line_qs.filter(
search=SearchQuery(
'"body burned" "kneecaps split" -"nostrils"',
search_type='websearch',
),
)
self.assertSequenceEqual(searched, [self.verse1])
searched = line_qs.filter(
search=SearchQuery(
'"Sir Robin" ("kneecaps" OR "Camelot")',
search_type='websearch',
),
)
self.assertSequenceEqual(searched, [self.verse0, self.verse1])
@skipUnlessDBFeature('has_websearch_to_tsquery')
def test_web_search_with_config(self):
line_qs = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue', config='french'),
)
searched = line_qs.filter(
search=SearchQuery('cadeau -beau', search_type='websearch', config='french'),
)
self.assertSequenceEqual(searched, [])
searched = line_qs.filter(
search=SearchQuery('beau cadeau', search_type='websearch', config='french'),
)
self.assertSequenceEqual(searched, [self.french])
def test_bad_search_type(self):
with self.assertRaisesMessage(ValueError, "Unknown search_type argument 'foo'."):
SearchQuery('kneecaps', search_type='foo')
def test_config_query_explicit(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue', config='french'),
).filter(search=SearchQuery('cadeaux', config='french'))
self.assertSequenceEqual(searched, [self.french])
def test_config_query_implicit(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue', config='french'),
).filter(search='cadeaux')
self.assertSequenceEqual(searched, [self.french])
def test_config_from_field_explicit(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue', config=F('dialogue_config')),
).filter(search=SearchQuery('cadeaux', config=F('dialogue_config')))
self.assertSequenceEqual(searched, [self.french])
def test_config_from_field_implicit(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue', config=F('dialogue_config')),
).filter(search='cadeaux')
self.assertSequenceEqual(searched, [self.french])
@modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
class TestCombinations(GrailTestData, PostgreSQLTestCase):
def test_vector_add(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting') + SearchVector('character__name'),
).filter(search='bedemir')
self.assertCountEqual(searched, [self.bedemir0, self.bedemir1, self.crowd, self.witch, self.duck])
def test_vector_add_multi(self):
searched = Line.objects.annotate(
search=(
SearchVector('scene__setting') +
SearchVector('character__name') +
SearchVector('dialogue')
),
).filter(search='bedemir')
self.assertCountEqual(searched, [self.bedemir0, self.bedemir1, self.crowd, self.witch, self.duck])
def test_vector_combined_mismatch(self):
msg = (
'SearchVector can only be combined with other SearchVector '
'instances, got NoneType.'
)
with self.assertRaisesMessage(TypeError, msg):
Line.objects.filter(dialogue__search=None + SearchVector('character__name'))
def test_query_and(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search=SearchQuery('bedemir') & SearchQuery('scales'))
self.assertSequenceEqual(searched, [self.bedemir0])
def test_query_multiple_and(self):
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search=SearchQuery('bedemir') & SearchQuery('scales') & SearchQuery('nostrils'))
self.assertSequenceEqual(searched, [])
searched = Line.objects.annotate(
search=SearchVector('scene__setting', 'dialogue'),
).filter(search=SearchQuery('shall') & SearchQuery('use') & SearchQuery('larger'))
self.assertSequenceEqual(searched, [self.bedemir0])
def test_query_or(self):
searched = Line.objects.filter(dialogue__search=SearchQuery('kneecaps') | SearchQuery('nostrils'))
self.assertCountEqual(searched, [self.verse1, self.verse2])
def test_query_multiple_or(self):
searched = Line.objects.filter(
dialogue__search=SearchQuery('kneecaps') | SearchQuery('nostrils') | SearchQuery('Sir Robin')
)
self.assertCountEqual(searched, [self.verse1, self.verse2, self.verse0])
def test_query_invert(self):
searched = Line.objects.filter(character=self.minstrel, dialogue__search=~SearchQuery('kneecaps'))
self.assertCountEqual(searched, [self.verse0, self.verse2])
def test_combine_different_configs(self):
searched = Line.objects.filter(
dialogue__search=(
SearchQuery('cadeau', config='french') |
SearchQuery('nostrils', config='english')
)
)
self.assertCountEqual(searched, [self.french, self.verse2])
@skipUnlessDBFeature('has_phraseto_tsquery')
def test_combine_raw_phrase(self):
searched = Line.objects.filter(
dialogue__search=(
SearchQuery('burn:*', search_type='raw', config='simple') |
SearchQuery('rode forth from Camelot', search_type='phrase')
)
)
self.assertCountEqual(searched, [self.verse0, self.verse1, self.verse2])
def test_query_combined_mismatch(self):
msg = (
'SearchQuery can only be combined with other SearchQuery '
'instances, got NoneType.'
)
with self.assertRaisesMessage(TypeError, msg):
Line.objects.filter(dialogue__search=None | SearchQuery('kneecaps'))
with self.assertRaisesMessage(TypeError, msg):
Line.objects.filter(dialogue__search=None & SearchQuery('kneecaps'))
@modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
class TestRankingAndWeights(GrailTestData, PostgreSQLTestCase):
def test_ranking(self):
searched = Line.objects.filter(character=self.minstrel).annotate(
rank=SearchRank(SearchVector('dialogue'), SearchQuery('brave sir robin')),
).order_by('rank')
self.assertSequenceEqual(searched, [self.verse2, self.verse1, self.verse0])
def test_rank_passing_untyped_args(self):
searched = Line.objects.filter(character=self.minstrel).annotate(
rank=SearchRank('dialogue', 'brave sir robin'),
).order_by('rank')
self.assertSequenceEqual(searched, [self.verse2, self.verse1, self.verse0])
def test_weights_in_vector(self):
vector = SearchVector('dialogue', weight='A') + SearchVector('character__name', weight='D')
searched = Line.objects.filter(scene=self.witch_scene).annotate(
rank=SearchRank(vector, SearchQuery('witch')),
).order_by('-rank')[:2]
self.assertSequenceEqual(searched, [self.crowd, self.witch])
vector = SearchVector('dialogue', weight='D') + SearchVector('character__name', weight='A')
searched = Line.objects.filter(scene=self.witch_scene).annotate(
rank=SearchRank(vector, SearchQuery('witch')),
).order_by('-rank')[:2]
self.assertSequenceEqual(searched, [self.witch, self.crowd])
def test_ranked_custom_weights(self):
vector = SearchVector('dialogue', weight='D') + SearchVector('character__name', weight='A')
searched = Line.objects.filter(scene=self.witch_scene).annotate(
rank=SearchRank(vector, SearchQuery('witch'), weights=[1, 0, 0, 0.5]),
).order_by('-rank')[:2]
self.assertSequenceEqual(searched, [self.crowd, self.witch])
def test_ranking_chaining(self):
searched = Line.objects.filter(character=self.minstrel).annotate(
rank=SearchRank(SearchVector('dialogue'), SearchQuery('brave sir robin')),
).filter(rank__gt=0.3)
self.assertSequenceEqual(searched, [self.verse0])
class SearchVectorIndexTests(PostgreSQLTestCase):
def test_search_vector_index(self):
"""SearchVector generates IMMUTABLE SQL in order to be indexable."""
# This test should be moved to test_indexes and use a functional
# index instead once support lands (see #26167).
query = Line.objects.all().query
resolved = SearchVector('id', 'dialogue', config='english').resolve_expression(query)
compiler = query.get_compiler(connection.alias)
sql, params = resolved.as_sql(compiler, connection)
# Indexed function must be IMMUTABLE.
with connection.cursor() as cursor:
cursor.execute(
'CREATE INDEX search_vector_index ON %s USING GIN (%s)' % (Line._meta.db_table, sql),
params,
)
class SearchQueryTests(SimpleTestCase):
def test_str(self):
tests = (
(~SearchQuery('a'), '~SearchQuery(a)'),
(
(SearchQuery('a') | SearchQuery('b')) & (SearchQuery('c') | SearchQuery('d')),
'((SearchQuery(a) || SearchQuery(b)) && (SearchQuery(c) || SearchQuery(d)))',
),
(
SearchQuery('a') & (SearchQuery('b') | SearchQuery('c')),
'(SearchQuery(a) && (SearchQuery(b) || SearchQuery(c)))',
),
(
(SearchQuery('a') | SearchQuery('b')) & SearchQuery('c'),
'((SearchQuery(a) || SearchQuery(b)) && SearchQuery(c))'
),
(
SearchQuery('a') & (SearchQuery('b') & (SearchQuery('c') | SearchQuery('d'))),
'(SearchQuery(a) && (SearchQuery(b) && (SearchQuery(c) || SearchQuery(d))))',
),
)
for query, expected_str in tests:
with self.subTest(query=query):
self.assertEqual(str(query), expected_str)
|
1ee2de84509bcb63f63a4d20e611246be8baa5bacc5f483e2405fe9807288d9f | import unittest
from migrations.test_base import OperationTestBase
from django.db import NotSupportedError, connection
from django.db.models import Index
from django.test import modify_settings
try:
from django.contrib.postgres.operations import (
AddIndexConcurrently, RemoveIndexConcurrently,
)
from django.contrib.postgres.indexes import BrinIndex, BTreeIndex
except ImportError:
pass
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL specific tests.')
@modify_settings(INSTALLED_APPS={'append': 'migrations'})
class AddIndexConcurrentlyTests(OperationTestBase):
app_label = 'test_add_concurrently'
def test_requires_atomic_false(self):
project_state = self.set_up_test_model(self.app_label)
new_state = project_state.clone()
operation = AddIndexConcurrently(
'Pony',
Index(fields=['pink'], name='pony_pink_idx'),
)
msg = (
'The AddIndexConcurrently operation cannot be executed inside '
'a transaction (set atomic = False on the migration).'
)
with self.assertRaisesMessage(NotSupportedError, msg):
with connection.schema_editor(atomic=True) as editor:
operation.database_forwards(self.app_label, editor, project_state, new_state)
def test_add(self):
project_state = self.set_up_test_model(self.app_label, index=False)
table_name = '%s_pony' % self.app_label
index = Index(fields=['pink'], name='pony_pink_idx')
new_state = project_state.clone()
operation = AddIndexConcurrently('Pony', index)
self.assertEqual(
operation.describe(),
'Concurrently create index pony_pink_idx on field(s) pink of '
'model Pony'
)
operation.state_forwards(self.app_label, new_state)
self.assertEqual(len(new_state.models[self.app_label, 'pony'].options['indexes']), 1)
self.assertIndexNotExists(table_name, ['pink'])
# Add index.
with connection.schema_editor(atomic=False) as editor:
operation.database_forwards(self.app_label, editor, project_state, new_state)
self.assertIndexExists(table_name, ['pink'])
# Reversal.
with connection.schema_editor(atomic=False) as editor:
operation.database_backwards(self.app_label, editor, new_state, project_state)
self.assertIndexNotExists(table_name, ['pink'])
# Deconstruction.
name, args, kwargs = operation.deconstruct()
self.assertEqual(name, 'AddIndexConcurrently')
self.assertEqual(args, [])
self.assertEqual(kwargs, {'model_name': 'Pony', 'index': index})
def test_add_other_index_type(self):
project_state = self.set_up_test_model(self.app_label, index=False)
table_name = '%s_pony' % self.app_label
new_state = project_state.clone()
operation = AddIndexConcurrently(
'Pony',
BrinIndex(fields=['pink'], name='pony_pink_brin_idx'),
)
self.assertIndexNotExists(table_name, ['pink'])
# Add index.
with connection.schema_editor(atomic=False) as editor:
operation.database_forwards(self.app_label, editor, project_state, new_state)
self.assertIndexExists(table_name, ['pink'], index_type='brin')
# Reversal.
with connection.schema_editor(atomic=False) as editor:
operation.database_backwards(self.app_label, editor, new_state, project_state)
self.assertIndexNotExists(table_name, ['pink'])
def test_add_with_options(self):
project_state = self.set_up_test_model(self.app_label, index=False)
table_name = '%s_pony' % self.app_label
new_state = project_state.clone()
index = BTreeIndex(fields=['pink'], name='pony_pink_btree_idx', fillfactor=70)
operation = AddIndexConcurrently('Pony', index)
self.assertIndexNotExists(table_name, ['pink'])
# Add index.
with connection.schema_editor(atomic=False) as editor:
operation.database_forwards(self.app_label, editor, project_state, new_state)
self.assertIndexExists(table_name, ['pink'], index_type='btree')
# Reversal.
with connection.schema_editor(atomic=False) as editor:
operation.database_backwards(self.app_label, editor, new_state, project_state)
self.assertIndexNotExists(table_name, ['pink'])
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL specific tests.')
@modify_settings(INSTALLED_APPS={'append': 'migrations'})
class RemoveIndexConcurrentlyTests(OperationTestBase):
app_label = 'test_rm_concurrently'
def test_requires_atomic_false(self):
project_state = self.set_up_test_model(self.app_label, index=True)
new_state = project_state.clone()
operation = RemoveIndexConcurrently('Pony', 'pony_pink_idx')
msg = (
'The RemoveIndexConcurrently operation cannot be executed inside '
'a transaction (set atomic = False on the migration).'
)
with self.assertRaisesMessage(NotSupportedError, msg):
with connection.schema_editor(atomic=True) as editor:
operation.database_forwards(self.app_label, editor, project_state, new_state)
def test_remove(self):
project_state = self.set_up_test_model(self.app_label, index=True)
table_name = '%s_pony' % self.app_label
self.assertTableExists(table_name)
new_state = project_state.clone()
operation = RemoveIndexConcurrently('Pony', 'pony_pink_idx')
self.assertEqual(
operation.describe(),
'Concurrently remove index pony_pink_idx from Pony',
)
operation.state_forwards(self.app_label, new_state)
self.assertEqual(len(new_state.models[self.app_label, 'pony'].options['indexes']), 0)
self.assertIndexExists(table_name, ['pink'])
# Remove index.
with connection.schema_editor(atomic=False) as editor:
operation.database_forwards(self.app_label, editor, project_state, new_state)
self.assertIndexNotExists(table_name, ['pink'])
# Reversal.
with connection.schema_editor(atomic=False) as editor:
operation.database_backwards(self.app_label, editor, new_state, project_state)
self.assertIndexExists(table_name, ['pink'])
# Deconstruction.
name, args, kwargs = operation.deconstruct()
self.assertEqual(name, 'RemoveIndexConcurrently')
self.assertEqual(args, [])
self.assertEqual(kwargs, {'model_name': 'Pony', 'name': 'pony_pink_idx'})
|
19a77e2068666f494174590df108447ae1d62039113259a7a9e13a4e9c3fa31d | import datetime
from unittest import mock
from django.db import IntegrityError, connection, transaction
from django.db.models import CheckConstraint, F, Func, Q
from django.utils import timezone
from . import PostgreSQLTestCase
from .models import HotelReservation, RangesModel, Room
try:
from django.contrib.postgres.constraints import ExclusionConstraint
from django.contrib.postgres.fields import DateTimeRangeField, RangeBoundary, RangeOperators
from psycopg2.extras import DateRange, NumericRange
except ImportError:
pass
class SchemaTests(PostgreSQLTestCase):
def get_constraints(self, table):
"""Get the constraints on the table using a new cursor."""
with connection.cursor() as cursor:
return connection.introspection.get_constraints(cursor, table)
def test_check_constraint_range_value(self):
constraint_name = 'ints_between'
self.assertNotIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
constraint = CheckConstraint(
check=Q(ints__contained_by=NumericRange(10, 30)),
name=constraint_name,
)
with connection.schema_editor() as editor:
editor.add_constraint(RangesModel, constraint)
self.assertIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
with self.assertRaises(IntegrityError), transaction.atomic():
RangesModel.objects.create(ints=(20, 50))
RangesModel.objects.create(ints=(10, 30))
def test_check_constraint_daterange_contains(self):
constraint_name = 'dates_contains'
self.assertNotIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
constraint = CheckConstraint(
check=Q(dates__contains=F('dates_inner')),
name=constraint_name,
)
with connection.schema_editor() as editor:
editor.add_constraint(RangesModel, constraint)
self.assertIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
date_1 = datetime.date(2016, 1, 1)
date_2 = datetime.date(2016, 1, 4)
with self.assertRaises(IntegrityError), transaction.atomic():
RangesModel.objects.create(
dates=(date_1, date_2),
dates_inner=(date_1, date_2.replace(day=5)),
)
RangesModel.objects.create(
dates=(date_1, date_2),
dates_inner=(date_1, date_2),
)
def test_check_constraint_datetimerange_contains(self):
constraint_name = 'timestamps_contains'
self.assertNotIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
constraint = CheckConstraint(
check=Q(timestamps__contains=F('timestamps_inner')),
name=constraint_name,
)
with connection.schema_editor() as editor:
editor.add_constraint(RangesModel, constraint)
self.assertIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
datetime_1 = datetime.datetime(2016, 1, 1)
datetime_2 = datetime.datetime(2016, 1, 2, 12)
with self.assertRaises(IntegrityError), transaction.atomic():
RangesModel.objects.create(
timestamps=(datetime_1, datetime_2),
timestamps_inner=(datetime_1, datetime_2.replace(hour=13)),
)
RangesModel.objects.create(
timestamps=(datetime_1, datetime_2),
timestamps_inner=(datetime_1, datetime_2),
)
class ExclusionConstraintTests(PostgreSQLTestCase):
def get_constraints(self, table):
"""Get the constraints on the table using a new cursor."""
with connection.cursor() as cursor:
return connection.introspection.get_constraints(cursor, table)
def test_invalid_condition(self):
msg = 'ExclusionConstraint.condition must be a Q instance.'
with self.assertRaisesMessage(ValueError, msg):
ExclusionConstraint(
index_type='GIST',
name='exclude_invalid_condition',
expressions=[(F('datespan'), RangeOperators.OVERLAPS)],
condition=F('invalid'),
)
def test_invalid_index_type(self):
msg = 'Exclusion constraints only support GiST or SP-GiST indexes.'
with self.assertRaisesMessage(ValueError, msg):
ExclusionConstraint(
index_type='gin',
name='exclude_invalid_index_type',
expressions=[(F('datespan'), RangeOperators.OVERLAPS)],
)
def test_invalid_expressions(self):
msg = 'The expressions must be a list of 2-tuples.'
for expressions in (['foo'], [('foo')], [('foo_1', 'foo_2', 'foo_3')]):
with self.subTest(expressions), self.assertRaisesMessage(ValueError, msg):
ExclusionConstraint(
index_type='GIST',
name='exclude_invalid_expressions',
expressions=expressions,
)
def test_empty_expressions(self):
msg = 'At least one expression is required to define an exclusion constraint.'
for empty_expressions in (None, []):
with self.subTest(empty_expressions), self.assertRaisesMessage(ValueError, msg):
ExclusionConstraint(
index_type='GIST',
name='exclude_empty_expressions',
expressions=empty_expressions,
)
def test_repr(self):
constraint = ExclusionConstraint(
name='exclude_overlapping',
expressions=[
(F('datespan'), RangeOperators.OVERLAPS),
(F('room'), RangeOperators.EQUAL),
],
)
self.assertEqual(
repr(constraint),
"<ExclusionConstraint: index_type=GIST, expressions=["
"(F(datespan), '&&'), (F(room), '=')]>",
)
constraint = ExclusionConstraint(
name='exclude_overlapping',
expressions=[(F('datespan'), RangeOperators.ADJACENT_TO)],
condition=Q(cancelled=False),
index_type='SPGiST',
)
self.assertEqual(
repr(constraint),
"<ExclusionConstraint: index_type=SPGiST, expressions=["
"(F(datespan), '-|-')], condition=(AND: ('cancelled', False))>",
)
def test_eq(self):
constraint_1 = ExclusionConstraint(
name='exclude_overlapping',
expressions=[
(F('datespan'), RangeOperators.OVERLAPS),
(F('room'), RangeOperators.EQUAL),
],
condition=Q(cancelled=False),
)
constraint_2 = ExclusionConstraint(
name='exclude_overlapping',
expressions=[
('datespan', RangeOperators.OVERLAPS),
('room', RangeOperators.EQUAL),
],
)
constraint_3 = ExclusionConstraint(
name='exclude_overlapping',
expressions=[('datespan', RangeOperators.OVERLAPS)],
condition=Q(cancelled=False),
)
self.assertEqual(constraint_1, constraint_1)
self.assertEqual(constraint_1, mock.ANY)
self.assertNotEqual(constraint_1, constraint_2)
self.assertNotEqual(constraint_1, constraint_3)
self.assertNotEqual(constraint_2, constraint_3)
self.assertNotEqual(constraint_1, object())
def test_deconstruct(self):
constraint = ExclusionConstraint(
name='exclude_overlapping',
expressions=[('datespan', RangeOperators.OVERLAPS), ('room', RangeOperators.EQUAL)],
)
path, args, kwargs = constraint.deconstruct()
self.assertEqual(path, 'django.contrib.postgres.constraints.ExclusionConstraint')
self.assertEqual(args, ())
self.assertEqual(kwargs, {
'name': 'exclude_overlapping',
'expressions': [('datespan', RangeOperators.OVERLAPS), ('room', RangeOperators.EQUAL)],
})
def test_deconstruct_index_type(self):
constraint = ExclusionConstraint(
name='exclude_overlapping',
index_type='SPGIST',
expressions=[('datespan', RangeOperators.OVERLAPS), ('room', RangeOperators.EQUAL)],
)
path, args, kwargs = constraint.deconstruct()
self.assertEqual(path, 'django.contrib.postgres.constraints.ExclusionConstraint')
self.assertEqual(args, ())
self.assertEqual(kwargs, {
'name': 'exclude_overlapping',
'index_type': 'SPGIST',
'expressions': [('datespan', RangeOperators.OVERLAPS), ('room', RangeOperators.EQUAL)],
})
def test_deconstruct_condition(self):
constraint = ExclusionConstraint(
name='exclude_overlapping',
expressions=[('datespan', RangeOperators.OVERLAPS), ('room', RangeOperators.EQUAL)],
condition=Q(cancelled=False),
)
path, args, kwargs = constraint.deconstruct()
self.assertEqual(path, 'django.contrib.postgres.constraints.ExclusionConstraint')
self.assertEqual(args, ())
self.assertEqual(kwargs, {
'name': 'exclude_overlapping',
'expressions': [('datespan', RangeOperators.OVERLAPS), ('room', RangeOperators.EQUAL)],
'condition': Q(cancelled=False),
})
def _test_range_overlaps(self, constraint):
# Create exclusion constraint.
self.assertNotIn(constraint.name, self.get_constraints(HotelReservation._meta.db_table))
with connection.schema_editor() as editor:
editor.add_constraint(HotelReservation, constraint)
self.assertIn(constraint.name, self.get_constraints(HotelReservation._meta.db_table))
# Add initial reservations.
room101 = Room.objects.create(number=101)
room102 = Room.objects.create(number=102)
datetimes = [
timezone.datetime(2018, 6, 20),
timezone.datetime(2018, 6, 24),
timezone.datetime(2018, 6, 26),
timezone.datetime(2018, 6, 28),
timezone.datetime(2018, 6, 29),
]
HotelReservation.objects.create(
datespan=DateRange(datetimes[0].date(), datetimes[1].date()),
start=datetimes[0],
end=datetimes[1],
room=room102,
)
HotelReservation.objects.create(
datespan=DateRange(datetimes[1].date(), datetimes[3].date()),
start=datetimes[1],
end=datetimes[3],
room=room102,
)
# Overlap dates.
with self.assertRaises(IntegrityError), transaction.atomic():
reservation = HotelReservation(
datespan=(datetimes[1].date(), datetimes[2].date()),
start=datetimes[1],
end=datetimes[2],
room=room102,
)
reservation.save()
# Valid range.
HotelReservation.objects.bulk_create([
# Other room.
HotelReservation(
datespan=(datetimes[1].date(), datetimes[2].date()),
start=datetimes[1],
end=datetimes[2],
room=room101,
),
# Cancelled reservation.
HotelReservation(
datespan=(datetimes[1].date(), datetimes[1].date()),
start=datetimes[1],
end=datetimes[2],
room=room102,
cancelled=True,
),
# Other adjacent dates.
HotelReservation(
datespan=(datetimes[3].date(), datetimes[4].date()),
start=datetimes[3],
end=datetimes[4],
room=room102,
),
])
def test_range_overlaps_custom(self):
class TsTzRange(Func):
function = 'TSTZRANGE'
output_field = DateTimeRangeField()
constraint = ExclusionConstraint(
name='exclude_overlapping_reservations_custom',
expressions=[
(TsTzRange('start', 'end', RangeBoundary()), RangeOperators.OVERLAPS),
('room', RangeOperators.EQUAL)
],
condition=Q(cancelled=False),
)
self._test_range_overlaps(constraint)
def test_range_overlaps(self):
constraint = ExclusionConstraint(
name='exclude_overlapping_reservations',
expressions=[
(F('datespan'), RangeOperators.OVERLAPS),
('room', RangeOperators.EQUAL)
],
condition=Q(cancelled=False),
)
self._test_range_overlaps(constraint)
def test_range_adjacent(self):
constraint_name = 'ints_adjacent'
self.assertNotIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
constraint = ExclusionConstraint(
name=constraint_name,
expressions=[('ints', RangeOperators.ADJACENT_TO)],
)
with connection.schema_editor() as editor:
editor.add_constraint(RangesModel, constraint)
self.assertIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))
RangesModel.objects.create(ints=(20, 50))
with self.assertRaises(IntegrityError), transaction.atomic():
RangesModel.objects.create(ints=(10, 20))
RangesModel.objects.create(ints=(10, 19))
RangesModel.objects.create(ints=(51, 60))
|
1da69f5056bce57e3b32abf7e9e815733a1d8a4199e7d7e5e447b27b1b403298 | # Unit tests for cache framework
# Uses whatever cache backend is set in the test settings file.
import copy
import io
import os
import pickle
import re
import shutil
import tempfile
import threading
import time
import unittest
from pathlib import Path
from unittest import mock
from django.conf import settings
from django.core import management, signals
from django.core.cache import (
DEFAULT_CACHE_ALIAS, CacheKeyWarning, cache, caches,
)
from django.core.cache.utils import make_template_fragment_key
from django.db import close_old_connections, connection, connections
from django.http import (
HttpRequest, HttpResponse, HttpResponseNotModified, StreamingHttpResponse,
)
from django.middleware.cache import (
CacheMiddleware, FetchFromCacheMiddleware, UpdateCacheMiddleware,
)
from django.middleware.csrf import CsrfViewMiddleware
from django.template import engines
from django.template.context_processors import csrf
from django.template.response import TemplateResponse
from django.test import (
RequestFactory, SimpleTestCase, TestCase, TransactionTestCase,
override_settings,
)
from django.test.signals import setting_changed
from django.utils import timezone, translation
from django.utils.cache import (
get_cache_key, learn_cache_key, patch_cache_control, patch_vary_headers,
)
from django.views.decorators.cache import cache_control, cache_page
from .models import Poll, expensive_calculation
# functions/classes for complex data type tests
def f():
return 42
class C:
def m(n):
return 24
class Unpicklable:
def __getstate__(self):
raise pickle.PickleError()
KEY_ERRORS_WITH_MEMCACHED_MSG = (
'Cache key contains characters that will cause errors if used with '
'memcached: %r'
)
@override_settings(CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.dummy.DummyCache',
}
})
class DummyCacheTests(SimpleTestCase):
# The Dummy cache backend doesn't really behave like a test backend,
# so it has its own test case.
def test_simple(self):
"Dummy cache backend ignores cache set calls"
cache.set("key", "value")
self.assertIsNone(cache.get("key"))
def test_add(self):
"Add doesn't do anything in dummy cache backend"
self.assertIs(cache.add("addkey1", "value"), True)
self.assertIs(cache.add("addkey1", "newvalue"), True)
self.assertIsNone(cache.get("addkey1"))
def test_non_existent(self):
"Nonexistent keys aren't found in the dummy cache backend"
self.assertIsNone(cache.get("does_not_exist"))
self.assertEqual(cache.get("does_not_exist", "bang!"), "bang!")
def test_get_many(self):
"get_many returns nothing for the dummy cache backend"
cache.set_many({'a': 'a', 'b': 'b', 'c': 'c', 'd': 'd'})
self.assertEqual(cache.get_many(['a', 'c', 'd']), {})
self.assertEqual(cache.get_many(['a', 'b', 'e']), {})
def test_get_many_invalid_key(self):
msg = KEY_ERRORS_WITH_MEMCACHED_MSG % ':1:key with spaces'
with self.assertWarnsMessage(CacheKeyWarning, msg):
cache.get_many(['key with spaces'])
def test_delete(self):
"Cache deletion is transparently ignored on the dummy cache backend"
cache.set_many({'key1': 'spam', 'key2': 'eggs'})
self.assertIsNone(cache.get("key1"))
self.assertIs(cache.delete("key1"), False)
self.assertIsNone(cache.get("key1"))
self.assertIsNone(cache.get("key2"))
def test_has_key(self):
"The has_key method doesn't ever return True for the dummy cache backend"
cache.set("hello1", "goodbye1")
self.assertIs(cache.has_key("hello1"), False)
self.assertIs(cache.has_key("goodbye1"), False)
def test_in(self):
"The in operator doesn't ever return True for the dummy cache backend"
cache.set("hello2", "goodbye2")
self.assertNotIn("hello2", cache)
self.assertNotIn("goodbye2", cache)
def test_incr(self):
"Dummy cache values can't be incremented"
cache.set('answer', 42)
with self.assertRaises(ValueError):
cache.incr('answer')
with self.assertRaises(ValueError):
cache.incr('does_not_exist')
def test_decr(self):
"Dummy cache values can't be decremented"
cache.set('answer', 42)
with self.assertRaises(ValueError):
cache.decr('answer')
with self.assertRaises(ValueError):
cache.decr('does_not_exist')
def test_touch(self):
"""Dummy cache can't do touch()."""
self.assertIs(cache.touch('whatever'), False)
def test_data_types(self):
"All data types are ignored equally by the dummy cache"
stuff = {
'string': 'this is a string',
'int': 42,
'list': [1, 2, 3, 4],
'tuple': (1, 2, 3, 4),
'dict': {'A': 1, 'B': 2},
'function': f,
'class': C,
}
cache.set("stuff", stuff)
self.assertIsNone(cache.get("stuff"))
def test_expiration(self):
"Expiration has no effect on the dummy cache"
cache.set('expire1', 'very quickly', 1)
cache.set('expire2', 'very quickly', 1)
cache.set('expire3', 'very quickly', 1)
time.sleep(2)
self.assertIsNone(cache.get("expire1"))
self.assertIs(cache.add("expire2", "newvalue"), True)
self.assertIsNone(cache.get("expire2"))
self.assertIs(cache.has_key("expire3"), False)
def test_unicode(self):
"Unicode values are ignored by the dummy cache"
stuff = {
'ascii': 'ascii_value',
'unicode_ascii': 'Iñtërnâtiônàlizætiøn1',
'Iñtërnâtiônàlizætiøn': 'Iñtërnâtiônàlizætiøn2',
'ascii2': {'x': 1}
}
for (key, value) in stuff.items():
with self.subTest(key=key):
cache.set(key, value)
self.assertIsNone(cache.get(key))
def test_set_many(self):
"set_many does nothing for the dummy cache backend"
self.assertEqual(cache.set_many({'a': 1, 'b': 2}), [])
self.assertEqual(cache.set_many({'a': 1, 'b': 2}, timeout=2, version='1'), [])
def test_set_many_invalid_key(self):
msg = KEY_ERRORS_WITH_MEMCACHED_MSG % ':1:key with spaces'
with self.assertWarnsMessage(CacheKeyWarning, msg):
cache.set_many({'key with spaces': 'foo'})
def test_delete_many(self):
"delete_many does nothing for the dummy cache backend"
cache.delete_many(['a', 'b'])
def test_delete_many_invalid_key(self):
msg = KEY_ERRORS_WITH_MEMCACHED_MSG % ':1:key with spaces'
with self.assertWarnsMessage(CacheKeyWarning, msg):
cache.delete_many({'key with spaces': 'foo'})
def test_clear(self):
"clear does nothing for the dummy cache backend"
cache.clear()
def test_incr_version(self):
"Dummy cache versions can't be incremented"
cache.set('answer', 42)
with self.assertRaises(ValueError):
cache.incr_version('answer')
with self.assertRaises(ValueError):
cache.incr_version('does_not_exist')
def test_decr_version(self):
"Dummy cache versions can't be decremented"
cache.set('answer', 42)
with self.assertRaises(ValueError):
cache.decr_version('answer')
with self.assertRaises(ValueError):
cache.decr_version('does_not_exist')
def test_get_or_set(self):
self.assertEqual(cache.get_or_set('mykey', 'default'), 'default')
self.assertIsNone(cache.get_or_set('mykey', None))
def test_get_or_set_callable(self):
def my_callable():
return 'default'
self.assertEqual(cache.get_or_set('mykey', my_callable), 'default')
self.assertEqual(cache.get_or_set('mykey', my_callable()), 'default')
def custom_key_func(key, key_prefix, version):
"A customized cache key function"
return 'CUSTOM-' + '-'.join([key_prefix, str(version), key])
_caches_setting_base = {
'default': {},
'prefix': {'KEY_PREFIX': 'cacheprefix{}'.format(os.getpid())},
'v2': {'VERSION': 2},
'custom_key': {'KEY_FUNCTION': custom_key_func},
'custom_key2': {'KEY_FUNCTION': 'cache.tests.custom_key_func'},
'cull': {'OPTIONS': {'MAX_ENTRIES': 30}},
'zero_cull': {'OPTIONS': {'CULL_FREQUENCY': 0, 'MAX_ENTRIES': 30}},
}
def caches_setting_for_tests(base=None, exclude=None, **params):
# `base` is used to pull in the memcached config from the original settings,
# `exclude` is a set of cache names denoting which `_caches_setting_base` keys
# should be omitted.
# `params` are test specific overrides and `_caches_settings_base` is the
# base config for the tests.
# This results in the following search order:
# params -> _caches_setting_base -> base
base = base or {}
exclude = exclude or set()
setting = {k: base.copy() for k in _caches_setting_base if k not in exclude}
for key, cache_params in setting.items():
cache_params.update(_caches_setting_base[key])
cache_params.update(params)
return setting
class BaseCacheTests:
# A common set of tests to apply to all cache backends
factory = RequestFactory()
def tearDown(self):
cache.clear()
def test_simple(self):
# Simple cache set/get works
cache.set("key", "value")
self.assertEqual(cache.get("key"), "value")
def test_default_used_when_none_is_set(self):
"""If None is cached, get() returns it instead of the default."""
cache.set('key_default_none', None)
self.assertIsNone(cache.get('key_default_none', default='default'))
def test_add(self):
# A key can be added to a cache
self.assertIs(cache.add("addkey1", "value"), True)
self.assertIs(cache.add("addkey1", "newvalue"), False)
self.assertEqual(cache.get("addkey1"), "value")
def test_prefix(self):
# Test for same cache key conflicts between shared backend
cache.set('somekey', 'value')
# should not be set in the prefixed cache
self.assertIs(caches['prefix'].has_key('somekey'), False)
caches['prefix'].set('somekey', 'value2')
self.assertEqual(cache.get('somekey'), 'value')
self.assertEqual(caches['prefix'].get('somekey'), 'value2')
def test_non_existent(self):
"""Nonexistent cache keys return as None/default."""
self.assertIsNone(cache.get("does_not_exist"))
self.assertEqual(cache.get("does_not_exist", "bang!"), "bang!")
def test_get_many(self):
# Multiple cache keys can be returned using get_many
cache.set_many({'a': 'a', 'b': 'b', 'c': 'c', 'd': 'd'})
self.assertEqual(cache.get_many(['a', 'c', 'd']), {'a': 'a', 'c': 'c', 'd': 'd'})
self.assertEqual(cache.get_many(['a', 'b', 'e']), {'a': 'a', 'b': 'b'})
self.assertEqual(cache.get_many(iter(['a', 'b', 'e'])), {'a': 'a', 'b': 'b'})
def test_delete(self):
# Cache keys can be deleted
cache.set_many({'key1': 'spam', 'key2': 'eggs'})
self.assertEqual(cache.get("key1"), "spam")
self.assertIs(cache.delete("key1"), True)
self.assertIsNone(cache.get("key1"))
self.assertEqual(cache.get("key2"), "eggs")
def test_delete_nonexistent(self):
self.assertIs(cache.delete('nonexistent_key'), False)
def test_has_key(self):
# The cache can be inspected for cache keys
cache.set("hello1", "goodbye1")
self.assertIs(cache.has_key("hello1"), True)
self.assertIs(cache.has_key("goodbye1"), False)
cache.set("no_expiry", "here", None)
self.assertIs(cache.has_key("no_expiry"), True)
def test_in(self):
# The in operator can be used to inspect cache contents
cache.set("hello2", "goodbye2")
self.assertIn("hello2", cache)
self.assertNotIn("goodbye2", cache)
def test_incr(self):
# Cache values can be incremented
cache.set('answer', 41)
self.assertEqual(cache.incr('answer'), 42)
self.assertEqual(cache.get('answer'), 42)
self.assertEqual(cache.incr('answer', 10), 52)
self.assertEqual(cache.get('answer'), 52)
self.assertEqual(cache.incr('answer', -10), 42)
with self.assertRaises(ValueError):
cache.incr('does_not_exist')
def test_decr(self):
# Cache values can be decremented
cache.set('answer', 43)
self.assertEqual(cache.decr('answer'), 42)
self.assertEqual(cache.get('answer'), 42)
self.assertEqual(cache.decr('answer', 10), 32)
self.assertEqual(cache.get('answer'), 32)
self.assertEqual(cache.decr('answer', -10), 42)
with self.assertRaises(ValueError):
cache.decr('does_not_exist')
def test_close(self):
self.assertTrue(hasattr(cache, 'close'))
cache.close()
def test_data_types(self):
# Many different data types can be cached
stuff = {
'string': 'this is a string',
'int': 42,
'list': [1, 2, 3, 4],
'tuple': (1, 2, 3, 4),
'dict': {'A': 1, 'B': 2},
'function': f,
'class': C,
}
cache.set("stuff", stuff)
self.assertEqual(cache.get("stuff"), stuff)
def test_cache_read_for_model_instance(self):
# Don't want fields with callable as default to be called on cache read
expensive_calculation.num_runs = 0
Poll.objects.all().delete()
my_poll = Poll.objects.create(question="Well?")
self.assertEqual(Poll.objects.count(), 1)
pub_date = my_poll.pub_date
cache.set('question', my_poll)
cached_poll = cache.get('question')
self.assertEqual(cached_poll.pub_date, pub_date)
# We only want the default expensive calculation run once
self.assertEqual(expensive_calculation.num_runs, 1)
def test_cache_write_for_model_instance_with_deferred(self):
# Don't want fields with callable as default to be called on cache write
expensive_calculation.num_runs = 0
Poll.objects.all().delete()
Poll.objects.create(question="What?")
self.assertEqual(expensive_calculation.num_runs, 1)
defer_qs = Poll.objects.all().defer('question')
self.assertEqual(defer_qs.count(), 1)
self.assertEqual(expensive_calculation.num_runs, 1)
cache.set('deferred_queryset', defer_qs)
# cache set should not re-evaluate default functions
self.assertEqual(expensive_calculation.num_runs, 1)
def test_cache_read_for_model_instance_with_deferred(self):
# Don't want fields with callable as default to be called on cache read
expensive_calculation.num_runs = 0
Poll.objects.all().delete()
Poll.objects.create(question="What?")
self.assertEqual(expensive_calculation.num_runs, 1)
defer_qs = Poll.objects.all().defer('question')
self.assertEqual(defer_qs.count(), 1)
cache.set('deferred_queryset', defer_qs)
self.assertEqual(expensive_calculation.num_runs, 1)
runs_before_cache_read = expensive_calculation.num_runs
cache.get('deferred_queryset')
# We only want the default expensive calculation run on creation and set
self.assertEqual(expensive_calculation.num_runs, runs_before_cache_read)
def test_expiration(self):
# Cache values can be set to expire
cache.set('expire1', 'very quickly', 1)
cache.set('expire2', 'very quickly', 1)
cache.set('expire3', 'very quickly', 1)
time.sleep(2)
self.assertIsNone(cache.get("expire1"))
self.assertIs(cache.add("expire2", "newvalue"), True)
self.assertEqual(cache.get("expire2"), "newvalue")
self.assertIs(cache.has_key("expire3"), False)
def test_touch(self):
# cache.touch() updates the timeout.
cache.set('expire1', 'very quickly', timeout=1)
self.assertIs(cache.touch('expire1', timeout=4), True)
time.sleep(2)
self.assertIs(cache.has_key('expire1'), True)
time.sleep(3)
self.assertIs(cache.has_key('expire1'), False)
# cache.touch() works without the timeout argument.
cache.set('expire1', 'very quickly', timeout=1)
self.assertIs(cache.touch('expire1'), True)
time.sleep(2)
self.assertIs(cache.has_key('expire1'), True)
self.assertIs(cache.touch('nonexistent'), False)
def test_unicode(self):
# Unicode values can be cached
stuff = {
'ascii': 'ascii_value',
'unicode_ascii': 'Iñtërnâtiônàlizætiøn1',
'Iñtërnâtiônàlizætiøn': 'Iñtërnâtiônàlizætiøn2',
'ascii2': {'x': 1}
}
# Test `set`
for (key, value) in stuff.items():
with self.subTest(key=key):
cache.set(key, value)
self.assertEqual(cache.get(key), value)
# Test `add`
for (key, value) in stuff.items():
with self.subTest(key=key):
self.assertIs(cache.delete(key), True)
self.assertIs(cache.add(key, value), True)
self.assertEqual(cache.get(key), value)
# Test `set_many`
for (key, value) in stuff.items():
self.assertIs(cache.delete(key), True)
cache.set_many(stuff)
for (key, value) in stuff.items():
with self.subTest(key=key):
self.assertEqual(cache.get(key), value)
def test_binary_string(self):
# Binary strings should be cacheable
from zlib import compress, decompress
value = 'value_to_be_compressed'
compressed_value = compress(value.encode())
# Test set
cache.set('binary1', compressed_value)
compressed_result = cache.get('binary1')
self.assertEqual(compressed_value, compressed_result)
self.assertEqual(value, decompress(compressed_result).decode())
# Test add
self.assertIs(cache.add('binary1-add', compressed_value), True)
compressed_result = cache.get('binary1-add')
self.assertEqual(compressed_value, compressed_result)
self.assertEqual(value, decompress(compressed_result).decode())
# Test set_many
cache.set_many({'binary1-set_many': compressed_value})
compressed_result = cache.get('binary1-set_many')
self.assertEqual(compressed_value, compressed_result)
self.assertEqual(value, decompress(compressed_result).decode())
def test_set_many(self):
# Multiple keys can be set using set_many
cache.set_many({"key1": "spam", "key2": "eggs"})
self.assertEqual(cache.get("key1"), "spam")
self.assertEqual(cache.get("key2"), "eggs")
def test_set_many_returns_empty_list_on_success(self):
"""set_many() returns an empty list when all keys are inserted."""
failing_keys = cache.set_many({'key1': 'spam', 'key2': 'eggs'})
self.assertEqual(failing_keys, [])
def test_set_many_expiration(self):
# set_many takes a second ``timeout`` parameter
cache.set_many({"key1": "spam", "key2": "eggs"}, 1)
time.sleep(2)
self.assertIsNone(cache.get("key1"))
self.assertIsNone(cache.get("key2"))
def test_delete_many(self):
# Multiple keys can be deleted using delete_many
cache.set_many({'key1': 'spam', 'key2': 'eggs', 'key3': 'ham'})
cache.delete_many(["key1", "key2"])
self.assertIsNone(cache.get("key1"))
self.assertIsNone(cache.get("key2"))
self.assertEqual(cache.get("key3"), "ham")
def test_clear(self):
# The cache can be emptied using clear
cache.set_many({'key1': 'spam', 'key2': 'eggs'})
cache.clear()
self.assertIsNone(cache.get("key1"))
self.assertIsNone(cache.get("key2"))
def test_long_timeout(self):
"""
Follow memcached's convention where a timeout greater than 30 days is
treated as an absolute expiration timestamp instead of a relative
offset (#12399).
"""
cache.set('key1', 'eggs', 60 * 60 * 24 * 30 + 1) # 30 days + 1 second
self.assertEqual(cache.get('key1'), 'eggs')
self.assertIs(cache.add('key2', 'ham', 60 * 60 * 24 * 30 + 1), True)
self.assertEqual(cache.get('key2'), 'ham')
cache.set_many({'key3': 'sausage', 'key4': 'lobster bisque'}, 60 * 60 * 24 * 30 + 1)
self.assertEqual(cache.get('key3'), 'sausage')
self.assertEqual(cache.get('key4'), 'lobster bisque')
def test_forever_timeout(self):
"""
Passing in None into timeout results in a value that is cached forever
"""
cache.set('key1', 'eggs', None)
self.assertEqual(cache.get('key1'), 'eggs')
self.assertIs(cache.add('key2', 'ham', None), True)
self.assertEqual(cache.get('key2'), 'ham')
self.assertIs(cache.add('key1', 'new eggs', None), False)
self.assertEqual(cache.get('key1'), 'eggs')
cache.set_many({'key3': 'sausage', 'key4': 'lobster bisque'}, None)
self.assertEqual(cache.get('key3'), 'sausage')
self.assertEqual(cache.get('key4'), 'lobster bisque')
cache.set('key5', 'belgian fries', timeout=1)
self.assertIs(cache.touch('key5', timeout=None), True)
time.sleep(2)
self.assertEqual(cache.get('key5'), 'belgian fries')
def test_zero_timeout(self):
"""
Passing in zero into timeout results in a value that is not cached
"""
cache.set('key1', 'eggs', 0)
self.assertIsNone(cache.get('key1'))
self.assertIs(cache.add('key2', 'ham', 0), True)
self.assertIsNone(cache.get('key2'))
cache.set_many({'key3': 'sausage', 'key4': 'lobster bisque'}, 0)
self.assertIsNone(cache.get('key3'))
self.assertIsNone(cache.get('key4'))
cache.set('key5', 'belgian fries', timeout=5)
self.assertIs(cache.touch('key5', timeout=0), True)
self.assertIsNone(cache.get('key5'))
def test_float_timeout(self):
# Make sure a timeout given as a float doesn't crash anything.
cache.set("key1", "spam", 100.2)
self.assertEqual(cache.get("key1"), "spam")
def _perform_cull_test(self, cull_cache, initial_count, final_count):
# Create initial cache key entries. This will overflow the cache,
# causing a cull.
for i in range(1, initial_count):
cull_cache.set('cull%d' % i, 'value', 1000)
count = 0
# Count how many keys are left in the cache.
for i in range(1, initial_count):
if cull_cache.has_key('cull%d' % i):
count += 1
self.assertEqual(count, final_count)
def test_cull(self):
self._perform_cull_test(caches['cull'], 50, 29)
def test_zero_cull(self):
self._perform_cull_test(caches['zero_cull'], 50, 19)
def _perform_invalid_key_test(self, key, expected_warning):
"""
All the builtin backends (except memcached, see below) should warn on
keys that would be refused by memcached. This encourages portable
caching code without making it too difficult to use production backends
with more liberal key rules. Refs #6447.
"""
# mimic custom ``make_key`` method being defined since the default will
# never show the below warnings
def func(key, *args):
return key
old_func = cache.key_func
cache.key_func = func
try:
with self.assertWarnsMessage(CacheKeyWarning, expected_warning):
cache.set(key, 'value')
finally:
cache.key_func = old_func
def test_invalid_key_characters(self):
# memcached doesn't allow whitespace or control characters in keys.
key = 'key with spaces and 清'
self._perform_invalid_key_test(key, KEY_ERRORS_WITH_MEMCACHED_MSG % key)
def test_invalid_key_length(self):
# memcached limits key length to 250.
key = ('a' * 250) + '清'
expected_warning = (
'Cache key will cause errors if used with memcached: '
'%r (longer than %s)' % (key, 250)
)
self._perform_invalid_key_test(key, expected_warning)
def test_cache_versioning_get_set(self):
# set, using default version = 1
cache.set('answer1', 42)
self.assertEqual(cache.get('answer1'), 42)
self.assertEqual(cache.get('answer1', version=1), 42)
self.assertIsNone(cache.get('answer1', version=2))
self.assertIsNone(caches['v2'].get('answer1'))
self.assertEqual(caches['v2'].get('answer1', version=1), 42)
self.assertIsNone(caches['v2'].get('answer1', version=2))
# set, default version = 1, but manually override version = 2
cache.set('answer2', 42, version=2)
self.assertIsNone(cache.get('answer2'))
self.assertIsNone(cache.get('answer2', version=1))
self.assertEqual(cache.get('answer2', version=2), 42)
self.assertEqual(caches['v2'].get('answer2'), 42)
self.assertIsNone(caches['v2'].get('answer2', version=1))
self.assertEqual(caches['v2'].get('answer2', version=2), 42)
# v2 set, using default version = 2
caches['v2'].set('answer3', 42)
self.assertIsNone(cache.get('answer3'))
self.assertIsNone(cache.get('answer3', version=1))
self.assertEqual(cache.get('answer3', version=2), 42)
self.assertEqual(caches['v2'].get('answer3'), 42)
self.assertIsNone(caches['v2'].get('answer3', version=1))
self.assertEqual(caches['v2'].get('answer3', version=2), 42)
# v2 set, default version = 2, but manually override version = 1
caches['v2'].set('answer4', 42, version=1)
self.assertEqual(cache.get('answer4'), 42)
self.assertEqual(cache.get('answer4', version=1), 42)
self.assertIsNone(cache.get('answer4', version=2))
self.assertIsNone(caches['v2'].get('answer4'))
self.assertEqual(caches['v2'].get('answer4', version=1), 42)
self.assertIsNone(caches['v2'].get('answer4', version=2))
def test_cache_versioning_add(self):
# add, default version = 1, but manually override version = 2
self.assertIs(cache.add('answer1', 42, version=2), True)
self.assertIsNone(cache.get('answer1', version=1))
self.assertEqual(cache.get('answer1', version=2), 42)
self.assertIs(cache.add('answer1', 37, version=2), False)
self.assertIsNone(cache.get('answer1', version=1))
self.assertEqual(cache.get('answer1', version=2), 42)
self.assertIs(cache.add('answer1', 37, version=1), True)
self.assertEqual(cache.get('answer1', version=1), 37)
self.assertEqual(cache.get('answer1', version=2), 42)
# v2 add, using default version = 2
self.assertIs(caches['v2'].add('answer2', 42), True)
self.assertIsNone(cache.get('answer2', version=1))
self.assertEqual(cache.get('answer2', version=2), 42)
self.assertIs(caches['v2'].add('answer2', 37), False)
self.assertIsNone(cache.get('answer2', version=1))
self.assertEqual(cache.get('answer2', version=2), 42)
self.assertIs(caches['v2'].add('answer2', 37, version=1), True)
self.assertEqual(cache.get('answer2', version=1), 37)
self.assertEqual(cache.get('answer2', version=2), 42)
# v2 add, default version = 2, but manually override version = 1
self.assertIs(caches['v2'].add('answer3', 42, version=1), True)
self.assertEqual(cache.get('answer3', version=1), 42)
self.assertIsNone(cache.get('answer3', version=2))
self.assertIs(caches['v2'].add('answer3', 37, version=1), False)
self.assertEqual(cache.get('answer3', version=1), 42)
self.assertIsNone(cache.get('answer3', version=2))
self.assertIs(caches['v2'].add('answer3', 37), True)
self.assertEqual(cache.get('answer3', version=1), 42)
self.assertEqual(cache.get('answer3', version=2), 37)
def test_cache_versioning_has_key(self):
cache.set('answer1', 42)
# has_key
self.assertIs(cache.has_key('answer1'), True)
self.assertIs(cache.has_key('answer1', version=1), True)
self.assertIs(cache.has_key('answer1', version=2), False)
self.assertIs(caches['v2'].has_key('answer1'), False)
self.assertIs(caches['v2'].has_key('answer1', version=1), True)
self.assertIs(caches['v2'].has_key('answer1', version=2), False)
def test_cache_versioning_delete(self):
cache.set('answer1', 37, version=1)
cache.set('answer1', 42, version=2)
self.assertIs(cache.delete('answer1'), True)
self.assertIsNone(cache.get('answer1', version=1))
self.assertEqual(cache.get('answer1', version=2), 42)
cache.set('answer2', 37, version=1)
cache.set('answer2', 42, version=2)
self.assertIs(cache.delete('answer2', version=2), True)
self.assertEqual(cache.get('answer2', version=1), 37)
self.assertIsNone(cache.get('answer2', version=2))
cache.set('answer3', 37, version=1)
cache.set('answer3', 42, version=2)
self.assertIs(caches['v2'].delete('answer3'), True)
self.assertEqual(cache.get('answer3', version=1), 37)
self.assertIsNone(cache.get('answer3', version=2))
cache.set('answer4', 37, version=1)
cache.set('answer4', 42, version=2)
self.assertIs(caches['v2'].delete('answer4', version=1), True)
self.assertIsNone(cache.get('answer4', version=1))
self.assertEqual(cache.get('answer4', version=2), 42)
def test_cache_versioning_incr_decr(self):
cache.set('answer1', 37, version=1)
cache.set('answer1', 42, version=2)
self.assertEqual(cache.incr('answer1'), 38)
self.assertEqual(cache.get('answer1', version=1), 38)
self.assertEqual(cache.get('answer1', version=2), 42)
self.assertEqual(cache.decr('answer1'), 37)
self.assertEqual(cache.get('answer1', version=1), 37)
self.assertEqual(cache.get('answer1', version=2), 42)
cache.set('answer2', 37, version=1)
cache.set('answer2', 42, version=2)
self.assertEqual(cache.incr('answer2', version=2), 43)
self.assertEqual(cache.get('answer2', version=1), 37)
self.assertEqual(cache.get('answer2', version=2), 43)
self.assertEqual(cache.decr('answer2', version=2), 42)
self.assertEqual(cache.get('answer2', version=1), 37)
self.assertEqual(cache.get('answer2', version=2), 42)
cache.set('answer3', 37, version=1)
cache.set('answer3', 42, version=2)
self.assertEqual(caches['v2'].incr('answer3'), 43)
self.assertEqual(cache.get('answer3', version=1), 37)
self.assertEqual(cache.get('answer3', version=2), 43)
self.assertEqual(caches['v2'].decr('answer3'), 42)
self.assertEqual(cache.get('answer3', version=1), 37)
self.assertEqual(cache.get('answer3', version=2), 42)
cache.set('answer4', 37, version=1)
cache.set('answer4', 42, version=2)
self.assertEqual(caches['v2'].incr('answer4', version=1), 38)
self.assertEqual(cache.get('answer4', version=1), 38)
self.assertEqual(cache.get('answer4', version=2), 42)
self.assertEqual(caches['v2'].decr('answer4', version=1), 37)
self.assertEqual(cache.get('answer4', version=1), 37)
self.assertEqual(cache.get('answer4', version=2), 42)
def test_cache_versioning_get_set_many(self):
# set, using default version = 1
cache.set_many({'ford1': 37, 'arthur1': 42})
self.assertEqual(cache.get_many(['ford1', 'arthur1']), {'ford1': 37, 'arthur1': 42})
self.assertEqual(cache.get_many(['ford1', 'arthur1'], version=1), {'ford1': 37, 'arthur1': 42})
self.assertEqual(cache.get_many(['ford1', 'arthur1'], version=2), {})
self.assertEqual(caches['v2'].get_many(['ford1', 'arthur1']), {})
self.assertEqual(caches['v2'].get_many(['ford1', 'arthur1'], version=1), {'ford1': 37, 'arthur1': 42})
self.assertEqual(caches['v2'].get_many(['ford1', 'arthur1'], version=2), {})
# set, default version = 1, but manually override version = 2
cache.set_many({'ford2': 37, 'arthur2': 42}, version=2)
self.assertEqual(cache.get_many(['ford2', 'arthur2']), {})
self.assertEqual(cache.get_many(['ford2', 'arthur2'], version=1), {})
self.assertEqual(cache.get_many(['ford2', 'arthur2'], version=2), {'ford2': 37, 'arthur2': 42})
self.assertEqual(caches['v2'].get_many(['ford2', 'arthur2']), {'ford2': 37, 'arthur2': 42})
self.assertEqual(caches['v2'].get_many(['ford2', 'arthur2'], version=1), {})
self.assertEqual(caches['v2'].get_many(['ford2', 'arthur2'], version=2), {'ford2': 37, 'arthur2': 42})
# v2 set, using default version = 2
caches['v2'].set_many({'ford3': 37, 'arthur3': 42})
self.assertEqual(cache.get_many(['ford3', 'arthur3']), {})
self.assertEqual(cache.get_many(['ford3', 'arthur3'], version=1), {})
self.assertEqual(cache.get_many(['ford3', 'arthur3'], version=2), {'ford3': 37, 'arthur3': 42})
self.assertEqual(caches['v2'].get_many(['ford3', 'arthur3']), {'ford3': 37, 'arthur3': 42})
self.assertEqual(caches['v2'].get_many(['ford3', 'arthur3'], version=1), {})
self.assertEqual(caches['v2'].get_many(['ford3', 'arthur3'], version=2), {'ford3': 37, 'arthur3': 42})
# v2 set, default version = 2, but manually override version = 1
caches['v2'].set_many({'ford4': 37, 'arthur4': 42}, version=1)
self.assertEqual(cache.get_many(['ford4', 'arthur4']), {'ford4': 37, 'arthur4': 42})
self.assertEqual(cache.get_many(['ford4', 'arthur4'], version=1), {'ford4': 37, 'arthur4': 42})
self.assertEqual(cache.get_many(['ford4', 'arthur4'], version=2), {})
self.assertEqual(caches['v2'].get_many(['ford4', 'arthur4']), {})
self.assertEqual(caches['v2'].get_many(['ford4', 'arthur4'], version=1), {'ford4': 37, 'arthur4': 42})
self.assertEqual(caches['v2'].get_many(['ford4', 'arthur4'], version=2), {})
def test_incr_version(self):
cache.set('answer', 42, version=2)
self.assertIsNone(cache.get('answer'))
self.assertIsNone(cache.get('answer', version=1))
self.assertEqual(cache.get('answer', version=2), 42)
self.assertIsNone(cache.get('answer', version=3))
self.assertEqual(cache.incr_version('answer', version=2), 3)
self.assertIsNone(cache.get('answer'))
self.assertIsNone(cache.get('answer', version=1))
self.assertIsNone(cache.get('answer', version=2))
self.assertEqual(cache.get('answer', version=3), 42)
caches['v2'].set('answer2', 42)
self.assertEqual(caches['v2'].get('answer2'), 42)
self.assertIsNone(caches['v2'].get('answer2', version=1))
self.assertEqual(caches['v2'].get('answer2', version=2), 42)
self.assertIsNone(caches['v2'].get('answer2', version=3))
self.assertEqual(caches['v2'].incr_version('answer2'), 3)
self.assertIsNone(caches['v2'].get('answer2'))
self.assertIsNone(caches['v2'].get('answer2', version=1))
self.assertIsNone(caches['v2'].get('answer2', version=2))
self.assertEqual(caches['v2'].get('answer2', version=3), 42)
with self.assertRaises(ValueError):
cache.incr_version('does_not_exist')
def test_decr_version(self):
cache.set('answer', 42, version=2)
self.assertIsNone(cache.get('answer'))
self.assertIsNone(cache.get('answer', version=1))
self.assertEqual(cache.get('answer', version=2), 42)
self.assertEqual(cache.decr_version('answer', version=2), 1)
self.assertEqual(cache.get('answer'), 42)
self.assertEqual(cache.get('answer', version=1), 42)
self.assertIsNone(cache.get('answer', version=2))
caches['v2'].set('answer2', 42)
self.assertEqual(caches['v2'].get('answer2'), 42)
self.assertIsNone(caches['v2'].get('answer2', version=1))
self.assertEqual(caches['v2'].get('answer2', version=2), 42)
self.assertEqual(caches['v2'].decr_version('answer2'), 1)
self.assertIsNone(caches['v2'].get('answer2'))
self.assertEqual(caches['v2'].get('answer2', version=1), 42)
self.assertIsNone(caches['v2'].get('answer2', version=2))
with self.assertRaises(ValueError):
cache.decr_version('does_not_exist', version=2)
def test_custom_key_func(self):
# Two caches with different key functions aren't visible to each other
cache.set('answer1', 42)
self.assertEqual(cache.get('answer1'), 42)
self.assertIsNone(caches['custom_key'].get('answer1'))
self.assertIsNone(caches['custom_key2'].get('answer1'))
caches['custom_key'].set('answer2', 42)
self.assertIsNone(cache.get('answer2'))
self.assertEqual(caches['custom_key'].get('answer2'), 42)
self.assertEqual(caches['custom_key2'].get('answer2'), 42)
def test_cache_write_unpicklable_object(self):
update_middleware = UpdateCacheMiddleware()
update_middleware.cache = cache
fetch_middleware = FetchFromCacheMiddleware()
fetch_middleware.cache = cache
request = self.factory.get('/cache/test')
request._cache_update_cache = True
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertIsNone(get_cache_data)
response = HttpResponse()
content = 'Testing cookie serialization.'
response.content = content
response.set_cookie('foo', 'bar')
update_middleware.process_response(request, response)
get_cache_data = fetch_middleware.process_request(request)
self.assertIsNotNone(get_cache_data)
self.assertEqual(get_cache_data.content, content.encode())
self.assertEqual(get_cache_data.cookies, response.cookies)
update_middleware.process_response(request, get_cache_data)
get_cache_data = fetch_middleware.process_request(request)
self.assertIsNotNone(get_cache_data)
self.assertEqual(get_cache_data.content, content.encode())
self.assertEqual(get_cache_data.cookies, response.cookies)
def test_add_fail_on_pickleerror(self):
# Shouldn't fail silently if trying to cache an unpicklable type.
with self.assertRaises(pickle.PickleError):
cache.add('unpicklable', Unpicklable())
def test_set_fail_on_pickleerror(self):
with self.assertRaises(pickle.PickleError):
cache.set('unpicklable', Unpicklable())
def test_get_or_set(self):
self.assertIsNone(cache.get('projector'))
self.assertEqual(cache.get_or_set('projector', 42), 42)
self.assertEqual(cache.get('projector'), 42)
self.assertIsNone(cache.get_or_set('null', None))
def test_get_or_set_callable(self):
def my_callable():
return 'value'
self.assertEqual(cache.get_or_set('mykey', my_callable), 'value')
self.assertEqual(cache.get_or_set('mykey', my_callable()), 'value')
def test_get_or_set_callable_returning_none(self):
self.assertIsNone(cache.get_or_set('mykey', lambda: None))
# Previous get_or_set() doesn't store None in the cache.
self.assertEqual(cache.get('mykey', 'default'), 'default')
def test_get_or_set_version(self):
msg = "get_or_set() missing 1 required positional argument: 'default'"
self.assertEqual(cache.get_or_set('brian', 1979, version=2), 1979)
with self.assertRaisesMessage(TypeError, msg):
cache.get_or_set('brian')
with self.assertRaisesMessage(TypeError, msg):
cache.get_or_set('brian', version=1)
self.assertIsNone(cache.get('brian', version=1))
self.assertEqual(cache.get_or_set('brian', 42, version=1), 42)
self.assertEqual(cache.get_or_set('brian', 1979, version=2), 1979)
self.assertIsNone(cache.get('brian', version=3))
def test_get_or_set_racing(self):
with mock.patch('%s.%s' % (settings.CACHES['default']['BACKEND'], 'add')) as cache_add:
# Simulate cache.add() failing to add a value. In that case, the
# default value should be returned.
cache_add.return_value = False
self.assertEqual(cache.get_or_set('key', 'default'), 'default')
@override_settings(CACHES=caches_setting_for_tests(
BACKEND='django.core.cache.backends.db.DatabaseCache',
# Spaces are used in the table name to ensure quoting/escaping is working
LOCATION='test cache table'
))
class DBCacheTests(BaseCacheTests, TransactionTestCase):
available_apps = ['cache']
def setUp(self):
# The super calls needs to happen first for the settings override.
super().setUp()
self.create_table()
def tearDown(self):
# The super call needs to happen first because it uses the database.
super().tearDown()
self.drop_table()
def create_table(self):
management.call_command('createcachetable', verbosity=0)
def drop_table(self):
with connection.cursor() as cursor:
table_name = connection.ops.quote_name('test cache table')
cursor.execute('DROP TABLE %s' % table_name)
def test_get_many_num_queries(self):
cache.set_many({'a': 1, 'b': 2})
cache.set('expired', 'expired', 0.01)
with self.assertNumQueries(1):
self.assertEqual(cache.get_many(['a', 'b']), {'a': 1, 'b': 2})
time.sleep(0.02)
with self.assertNumQueries(2):
self.assertEqual(cache.get_many(['a', 'b', 'expired']), {'a': 1, 'b': 2})
def test_delete_many_num_queries(self):
cache.set_many({'a': 1, 'b': 2, 'c': 3})
with self.assertNumQueries(1):
cache.delete_many(['a', 'b', 'c'])
def test_zero_cull(self):
self._perform_cull_test(caches['zero_cull'], 50, 18)
def test_second_call_doesnt_crash(self):
out = io.StringIO()
management.call_command('createcachetable', stdout=out)
self.assertEqual(out.getvalue(), "Cache table 'test cache table' already exists.\n" * len(settings.CACHES))
@override_settings(CACHES=caches_setting_for_tests(
BACKEND='django.core.cache.backends.db.DatabaseCache',
# Use another table name to avoid the 'table already exists' message.
LOCATION='createcachetable_dry_run_mode'
))
def test_createcachetable_dry_run_mode(self):
out = io.StringIO()
management.call_command('createcachetable', dry_run=True, stdout=out)
output = out.getvalue()
self.assertTrue(output.startswith("CREATE TABLE"))
def test_createcachetable_with_table_argument(self):
"""
Delete and recreate cache table with legacy behavior (explicitly
specifying the table name).
"""
self.drop_table()
out = io.StringIO()
management.call_command(
'createcachetable',
'test cache table',
verbosity=2,
stdout=out,
)
self.assertEqual(out.getvalue(), "Cache table 'test cache table' created.\n")
@override_settings(USE_TZ=True)
class DBCacheWithTimeZoneTests(DBCacheTests):
pass
class DBCacheRouter:
"""A router that puts the cache table on the 'other' database."""
def db_for_read(self, model, **hints):
if model._meta.app_label == 'django_cache':
return 'other'
return None
def db_for_write(self, model, **hints):
if model._meta.app_label == 'django_cache':
return 'other'
return None
def allow_migrate(self, db, app_label, **hints):
if app_label == 'django_cache':
return db == 'other'
return None
@override_settings(
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
'LOCATION': 'my_cache_table',
},
},
)
class CreateCacheTableForDBCacheTests(TestCase):
databases = {'default', 'other'}
@override_settings(DATABASE_ROUTERS=[DBCacheRouter()])
def test_createcachetable_observes_database_router(self):
# cache table should not be created on 'default'
with self.assertNumQueries(0, using='default'):
management.call_command('createcachetable', database='default', verbosity=0)
# cache table should be created on 'other'
# Queries:
# 1: check table doesn't already exist
# 2: create savepoint (if transactional DDL is supported)
# 3: create the table
# 4: create the index
# 5: release savepoint (if transactional DDL is supported)
num = 5 if connections['other'].features.can_rollback_ddl else 3
with self.assertNumQueries(num, using='other'):
management.call_command('createcachetable', database='other', verbosity=0)
class PicklingSideEffect:
def __init__(self, cache):
self.cache = cache
self.locked = False
def __getstate__(self):
self.locked = self.cache._lock.locked()
return {}
limit_locmem_entries = override_settings(CACHES=caches_setting_for_tests(
BACKEND='django.core.cache.backends.locmem.LocMemCache',
OPTIONS={'MAX_ENTRIES': 9},
))
@override_settings(CACHES=caches_setting_for_tests(
BACKEND='django.core.cache.backends.locmem.LocMemCache',
))
class LocMemCacheTests(BaseCacheTests, TestCase):
def setUp(self):
super().setUp()
# LocMem requires a hack to make the other caches
# share a data store with the 'normal' cache.
caches['prefix']._cache = cache._cache
caches['prefix']._expire_info = cache._expire_info
caches['v2']._cache = cache._cache
caches['v2']._expire_info = cache._expire_info
caches['custom_key']._cache = cache._cache
caches['custom_key']._expire_info = cache._expire_info
caches['custom_key2']._cache = cache._cache
caches['custom_key2']._expire_info = cache._expire_info
@override_settings(CACHES={
'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'},
'other': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'other'
},
})
def test_multiple_caches(self):
"Multiple locmem caches are isolated"
cache.set('value', 42)
self.assertEqual(caches['default'].get('value'), 42)
self.assertIsNone(caches['other'].get('value'))
def test_locking_on_pickle(self):
"""#20613/#18541 -- Ensures pickling is done outside of the lock."""
bad_obj = PicklingSideEffect(cache)
cache.set('set', bad_obj)
self.assertFalse(bad_obj.locked, "Cache was locked during pickling")
self.assertIs(cache.add('add', bad_obj), True)
self.assertFalse(bad_obj.locked, "Cache was locked during pickling")
def test_incr_decr_timeout(self):
"""incr/decr does not modify expiry time (matches memcached behavior)"""
key = 'value'
_key = cache.make_key(key)
cache.set(key, 1, timeout=cache.default_timeout * 10)
expire = cache._expire_info[_key]
self.assertEqual(cache.incr(key), 2)
self.assertEqual(expire, cache._expire_info[_key])
self.assertEqual(cache.decr(key), 1)
self.assertEqual(expire, cache._expire_info[_key])
@limit_locmem_entries
def test_lru_get(self):
"""get() moves cache keys."""
for key in range(9):
cache.set(key, key, timeout=None)
for key in range(6):
self.assertEqual(cache.get(key), key)
cache.set(9, 9, timeout=None)
for key in range(6):
self.assertEqual(cache.get(key), key)
for key in range(6, 9):
self.assertIsNone(cache.get(key))
self.assertEqual(cache.get(9), 9)
@limit_locmem_entries
def test_lru_set(self):
"""set() moves cache keys."""
for key in range(9):
cache.set(key, key, timeout=None)
for key in range(3, 9):
cache.set(key, key, timeout=None)
cache.set(9, 9, timeout=None)
for key in range(3, 10):
self.assertEqual(cache.get(key), key)
for key in range(3):
self.assertIsNone(cache.get(key))
@limit_locmem_entries
def test_lru_incr(self):
"""incr() moves cache keys."""
for key in range(9):
cache.set(key, key, timeout=None)
for key in range(6):
self.assertEqual(cache.incr(key), key + 1)
cache.set(9, 9, timeout=None)
for key in range(6):
self.assertEqual(cache.get(key), key + 1)
for key in range(6, 9):
self.assertIsNone(cache.get(key))
self.assertEqual(cache.get(9), 9)
# memcached backend isn't guaranteed to be available.
# To check the memcached backend, the test settings file will
# need to contain at least one cache backend setting that points at
# your memcache server.
configured_caches = {}
for _cache_params in settings.CACHES.values():
configured_caches[_cache_params['BACKEND']] = _cache_params
MemcachedCache_params = configured_caches.get('django.core.cache.backends.memcached.MemcachedCache')
PyLibMCCache_params = configured_caches.get('django.core.cache.backends.memcached.PyLibMCCache')
# The memcached backends don't support cull-related options like `MAX_ENTRIES`.
memcached_excluded_caches = {'cull', 'zero_cull'}
class BaseMemcachedTests(BaseCacheTests):
# By default it's assumed that the client doesn't clean up connections
# properly, in which case the backend must do so after each request.
should_disconnect_on_close = True
def test_location_multiple_servers(self):
locations = [
['server1.tld', 'server2:11211'],
'server1.tld;server2:11211',
'server1.tld,server2:11211',
]
for location in locations:
with self.subTest(location=location):
params = {'BACKEND': self.base_params['BACKEND'], 'LOCATION': location}
with self.settings(CACHES={'default': params}):
self.assertEqual(cache._servers, ['server1.tld', 'server2:11211'])
def test_invalid_key_characters(self):
"""
On memcached, we don't introduce a duplicate key validation
step (for speed reasons), we just let the memcached API
library raise its own exception on bad keys. Refs #6447.
In order to be memcached-API-library agnostic, we only assert
that a generic exception of some kind is raised.
"""
# memcached does not allow whitespace or control characters in keys
# when using the ascii protocol.
with self.assertRaises(Exception):
cache.set('key with spaces', 'value')
def test_invalid_key_length(self):
# memcached limits key length to 250
with self.assertRaises(Exception):
cache.set('a' * 251, 'value')
def test_default_never_expiring_timeout(self):
# Regression test for #22845
with self.settings(CACHES=caches_setting_for_tests(
base=self.base_params,
exclude=memcached_excluded_caches,
TIMEOUT=None)):
cache.set('infinite_foo', 'bar')
self.assertEqual(cache.get('infinite_foo'), 'bar')
def test_default_far_future_timeout(self):
# Regression test for #22845
with self.settings(CACHES=caches_setting_for_tests(
base=self.base_params,
exclude=memcached_excluded_caches,
# 60*60*24*365, 1 year
TIMEOUT=31536000)):
cache.set('future_foo', 'bar')
self.assertEqual(cache.get('future_foo'), 'bar')
def test_cull(self):
# culling isn't implemented, memcached deals with it.
pass
def test_zero_cull(self):
# culling isn't implemented, memcached deals with it.
pass
def test_memcached_deletes_key_on_failed_set(self):
# By default memcached allows objects up to 1MB. For the cache_db session
# backend to always use the current session, memcached needs to delete
# the old key if it fails to set.
# pylibmc doesn't seem to have SERVER_MAX_VALUE_LENGTH as far as I can
# tell from a quick check of its source code. This is falling back to
# the default value exposed by python-memcached on my system.
max_value_length = getattr(cache._lib, 'SERVER_MAX_VALUE_LENGTH', 1048576)
cache.set('small_value', 'a')
self.assertEqual(cache.get('small_value'), 'a')
large_value = 'a' * (max_value_length + 1)
try:
cache.set('small_value', large_value)
except Exception:
# Some clients (e.g. pylibmc) raise when the value is too large,
# while others (e.g. python-memcached) intentionally return True
# indicating success. This test is primarily checking that the key
# was deleted, so the return/exception behavior for the set()
# itself is not important.
pass
# small_value should be deleted, or set if configured to accept larger values
value = cache.get('small_value')
self.assertTrue(value is None or value == large_value)
def test_close(self):
# For clients that don't manage their connections properly, the
# connection is closed when the request is complete.
signals.request_finished.disconnect(close_old_connections)
try:
with mock.patch.object(cache._lib.Client, 'disconnect_all', autospec=True) as mock_disconnect:
signals.request_finished.send(self.__class__)
self.assertIs(mock_disconnect.called, self.should_disconnect_on_close)
finally:
signals.request_finished.connect(close_old_connections)
def test_set_many_returns_failing_keys(self):
def fail_set_multi(mapping, *args, **kwargs):
return mapping.keys()
with mock.patch('%s.Client.set_multi' % self.client_library_name, side_effect=fail_set_multi):
failing_keys = cache.set_many({'key': 'value'})
self.assertEqual(failing_keys, ['key'])
@unittest.skipUnless(MemcachedCache_params, "MemcachedCache backend not configured")
@override_settings(CACHES=caches_setting_for_tests(
base=MemcachedCache_params,
exclude=memcached_excluded_caches,
))
class MemcachedCacheTests(BaseMemcachedTests, TestCase):
base_params = MemcachedCache_params
client_library_name = 'memcache'
def test_memcached_uses_highest_pickle_version(self):
# Regression test for #19810
for cache_key in settings.CACHES:
with self.subTest(cache_key=cache_key):
self.assertEqual(caches[cache_key]._cache.pickleProtocol, pickle.HIGHEST_PROTOCOL)
@override_settings(CACHES=caches_setting_for_tests(
base=MemcachedCache_params,
exclude=memcached_excluded_caches,
OPTIONS={'server_max_value_length': 9999},
))
def test_memcached_options(self):
self.assertEqual(cache._cache.server_max_value_length, 9999)
def test_default_used_when_none_is_set(self):
"""
python-memcached doesn't support default in get() so this test
overrides the one in BaseCacheTests.
"""
cache.set('key_default_none', None)
self.assertEqual(cache.get('key_default_none', default='default'), 'default')
@unittest.skipUnless(PyLibMCCache_params, "PyLibMCCache backend not configured")
@override_settings(CACHES=caches_setting_for_tests(
base=PyLibMCCache_params,
exclude=memcached_excluded_caches,
))
class PyLibMCCacheTests(BaseMemcachedTests, TestCase):
base_params = PyLibMCCache_params
client_library_name = 'pylibmc'
# libmemcached manages its own connections.
should_disconnect_on_close = False
# By default, pylibmc/libmemcached don't verify keys client-side and so
# this test triggers a server-side bug that causes later tests to fail
# (#19914). The `verify_keys` behavior option could be set to True (which
# would avoid triggering the server-side bug), however this test would
# still fail due to https://github.com/lericson/pylibmc/issues/219.
@unittest.skip("triggers a memcached-server bug, causing subsequent tests to fail")
def test_invalid_key_characters(self):
pass
@override_settings(CACHES=caches_setting_for_tests(
base=PyLibMCCache_params,
exclude=memcached_excluded_caches,
OPTIONS={
'binary': True,
'behaviors': {'tcp_nodelay': True},
},
))
def test_pylibmc_options(self):
self.assertTrue(cache._cache.binary)
self.assertEqual(cache._cache.behaviors['tcp_nodelay'], int(True))
@override_settings(CACHES=caches_setting_for_tests(
BACKEND='django.core.cache.backends.filebased.FileBasedCache',
))
class FileBasedCacheTests(BaseCacheTests, TestCase):
"""
Specific test cases for the file-based cache.
"""
def setUp(self):
super().setUp()
self.dirname = self.mkdtemp()
# Caches location cannot be modified through override_settings / modify_settings,
# hence settings are manipulated directly here and the setting_changed signal
# is triggered manually.
for cache_params in settings.CACHES.values():
cache_params['LOCATION'] = self.dirname
setting_changed.send(self.__class__, setting='CACHES', enter=False)
def tearDown(self):
super().tearDown()
# Call parent first, as cache.clear() may recreate cache base directory
shutil.rmtree(self.dirname)
def mkdtemp(self):
return tempfile.mkdtemp()
def test_ignores_non_cache_files(self):
fname = os.path.join(self.dirname, 'not-a-cache-file')
with open(fname, 'w'):
os.utime(fname, None)
cache.clear()
self.assertTrue(os.path.exists(fname),
'Expected cache.clear to ignore non cache files')
os.remove(fname)
def test_clear_does_not_remove_cache_dir(self):
cache.clear()
self.assertTrue(os.path.exists(self.dirname),
'Expected cache.clear to keep the cache dir')
def test_creates_cache_dir_if_nonexistent(self):
os.rmdir(self.dirname)
cache.set('foo', 'bar')
self.assertTrue(os.path.exists(self.dirname))
def test_get_ignores_enoent(self):
cache.set('foo', 'bar')
os.unlink(cache._key_to_file('foo'))
# Returns the default instead of erroring.
self.assertEqual(cache.get('foo', 'baz'), 'baz')
def test_get_does_not_ignore_non_filenotfound_exceptions(self):
with mock.patch('builtins.open', side_effect=OSError):
with self.assertRaises(OSError):
cache.get('foo')
def test_empty_cache_file_considered_expired(self):
cache_file = cache._key_to_file('foo')
with open(cache_file, 'wb') as fh:
fh.write(b'')
with open(cache_file, 'rb') as fh:
self.assertIs(cache._is_expired(fh), True)
class FileBasedCachePathLibTests(FileBasedCacheTests):
def mkdtemp(self):
tmp_dir = super().mkdtemp()
return Path(tmp_dir)
@override_settings(CACHES={
'default': {
'BACKEND': 'cache.liberal_backend.CacheClass',
},
})
class CustomCacheKeyValidationTests(SimpleTestCase):
"""
Tests for the ability to mixin a custom ``validate_key`` method to
a custom cache backend that otherwise inherits from a builtin
backend, and override the default key validation. Refs #6447.
"""
def test_custom_key_validation(self):
# this key is both longer than 250 characters, and has spaces
key = 'some key with spaces' * 15
val = 'a value'
cache.set(key, val)
self.assertEqual(cache.get(key), val)
@override_settings(
CACHES={
'default': {
'BACKEND': 'cache.closeable_cache.CacheClass',
}
}
)
class CacheClosingTests(SimpleTestCase):
def test_close(self):
self.assertFalse(cache.closed)
signals.request_finished.send(self.__class__)
self.assertTrue(cache.closed)
DEFAULT_MEMORY_CACHES_SETTINGS = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'unique-snowflake',
}
}
NEVER_EXPIRING_CACHES_SETTINGS = copy.deepcopy(DEFAULT_MEMORY_CACHES_SETTINGS)
NEVER_EXPIRING_CACHES_SETTINGS['default']['TIMEOUT'] = None
class DefaultNonExpiringCacheKeyTests(SimpleTestCase):
"""
Settings having Cache arguments with a TIMEOUT=None create Caches that will
set non-expiring keys.
"""
def setUp(self):
# The 5 minute (300 seconds) default expiration time for keys is
# defined in the implementation of the initializer method of the
# BaseCache type.
self.DEFAULT_TIMEOUT = caches[DEFAULT_CACHE_ALIAS].default_timeout
def tearDown(self):
del(self.DEFAULT_TIMEOUT)
def test_default_expiration_time_for_keys_is_5_minutes(self):
"""The default expiration time of a cache key is 5 minutes.
This value is defined in
django.core.cache.backends.base.BaseCache.__init__().
"""
self.assertEqual(300, self.DEFAULT_TIMEOUT)
def test_caches_with_unset_timeout_has_correct_default_timeout(self):
"""Caches that have the TIMEOUT parameter undefined in the default
settings will use the default 5 minute timeout.
"""
cache = caches[DEFAULT_CACHE_ALIAS]
self.assertEqual(self.DEFAULT_TIMEOUT, cache.default_timeout)
@override_settings(CACHES=NEVER_EXPIRING_CACHES_SETTINGS)
def test_caches_set_with_timeout_as_none_has_correct_default_timeout(self):
"""Memory caches that have the TIMEOUT parameter set to `None` in the
default settings with have `None` as the default timeout.
This means "no timeout".
"""
cache = caches[DEFAULT_CACHE_ALIAS]
self.assertIsNone(cache.default_timeout)
self.assertIsNone(cache.get_backend_timeout())
@override_settings(CACHES=DEFAULT_MEMORY_CACHES_SETTINGS)
def test_caches_with_unset_timeout_set_expiring_key(self):
"""Memory caches that have the TIMEOUT parameter unset will set cache
keys having the default 5 minute timeout.
"""
key = "my-key"
value = "my-value"
cache = caches[DEFAULT_CACHE_ALIAS]
cache.set(key, value)
cache_key = cache.make_key(key)
self.assertIsNotNone(cache._expire_info[cache_key])
@override_settings(CACHES=NEVER_EXPIRING_CACHES_SETTINGS)
def test_caches_set_with_timeout_as_none_set_non_expiring_key(self):
"""Memory caches that have the TIMEOUT parameter set to `None` will set
a non expiring key by default.
"""
key = "another-key"
value = "another-value"
cache = caches[DEFAULT_CACHE_ALIAS]
cache.set(key, value)
cache_key = cache.make_key(key)
self.assertIsNone(cache._expire_info[cache_key])
@override_settings(
CACHE_MIDDLEWARE_KEY_PREFIX='settingsprefix',
CACHE_MIDDLEWARE_SECONDS=1,
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
},
},
USE_I18N=False,
ALLOWED_HOSTS=['.example.com'],
)
class CacheUtils(SimpleTestCase):
"""TestCase for django.utils.cache functions."""
host = 'www.example.com'
path = '/cache/test/'
factory = RequestFactory(HTTP_HOST=host)
def tearDown(self):
cache.clear()
def _get_request_cache(self, method='GET', query_string=None, update_cache=None):
request = self._get_request(self.host, self.path,
method, query_string=query_string)
request._cache_update_cache = True if not update_cache else update_cache
return request
def _set_cache(self, request, msg):
response = HttpResponse()
response.content = msg
return UpdateCacheMiddleware().process_response(request, response)
def test_patch_vary_headers(self):
headers = (
# Initial vary, new headers, resulting vary.
(None, ('Accept-Encoding',), 'Accept-Encoding'),
('Accept-Encoding', ('accept-encoding',), 'Accept-Encoding'),
('Accept-Encoding', ('ACCEPT-ENCODING',), 'Accept-Encoding'),
('Cookie', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
('Cookie, Accept-Encoding', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
(None, ('Accept-Encoding', 'COOKIE'), 'Accept-Encoding, COOKIE'),
('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
('Cookie , Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
('*', ('Accept-Language', 'Cookie'), '*'),
('Accept-Language, Cookie', ('*',), '*'),
)
for initial_vary, newheaders, resulting_vary in headers:
with self.subTest(initial_vary=initial_vary, newheaders=newheaders):
response = HttpResponse()
if initial_vary is not None:
response['Vary'] = initial_vary
patch_vary_headers(response, newheaders)
self.assertEqual(response['Vary'], resulting_vary)
def test_get_cache_key(self):
request = self.factory.get(self.path)
response = HttpResponse()
# Expect None if no headers have been set yet.
self.assertIsNone(get_cache_key(request))
# Set headers to an empty list.
learn_cache_key(request, response)
self.assertEqual(
get_cache_key(request),
'views.decorators.cache.cache_page.settingsprefix.GET.'
'18a03f9c9649f7d684af5db3524f5c99.d41d8cd98f00b204e9800998ecf8427e'
)
# A specified key_prefix is taken into account.
key_prefix = 'localprefix'
learn_cache_key(request, response, key_prefix=key_prefix)
self.assertEqual(
get_cache_key(request, key_prefix=key_prefix),
'views.decorators.cache.cache_page.localprefix.GET.'
'18a03f9c9649f7d684af5db3524f5c99.d41d8cd98f00b204e9800998ecf8427e'
)
def test_get_cache_key_with_query(self):
request = self.factory.get(self.path, {'test': 1})
response = HttpResponse()
# Expect None if no headers have been set yet.
self.assertIsNone(get_cache_key(request))
# Set headers to an empty list.
learn_cache_key(request, response)
# The querystring is taken into account.
self.assertEqual(
get_cache_key(request),
'views.decorators.cache.cache_page.settingsprefix.GET.'
'beaf87a9a99ee81c673ea2d67ccbec2a.d41d8cd98f00b204e9800998ecf8427e'
)
def test_cache_key_varies_by_url(self):
"""
get_cache_key keys differ by fully-qualified URL instead of path
"""
request1 = self.factory.get(self.path, HTTP_HOST='sub-1.example.com')
learn_cache_key(request1, HttpResponse())
request2 = self.factory.get(self.path, HTTP_HOST='sub-2.example.com')
learn_cache_key(request2, HttpResponse())
self.assertNotEqual(get_cache_key(request1), get_cache_key(request2))
def test_learn_cache_key(self):
request = self.factory.head(self.path)
response = HttpResponse()
response['Vary'] = 'Pony'
# Make sure that the Vary header is added to the key hash
learn_cache_key(request, response)
self.assertEqual(
get_cache_key(request),
'views.decorators.cache.cache_page.settingsprefix.GET.'
'18a03f9c9649f7d684af5db3524f5c99.d41d8cd98f00b204e9800998ecf8427e'
)
def test_patch_cache_control(self):
tests = (
# Initial Cache-Control, kwargs to patch_cache_control, expected Cache-Control parts
(None, {'private': True}, {'private'}),
('', {'private': True}, {'private'}),
# no-cache.
('', {'no_cache': 'Set-Cookie'}, {'no-cache=Set-Cookie'}),
('', {'no-cache': 'Set-Cookie'}, {'no-cache=Set-Cookie'}),
('no-cache=Set-Cookie', {'no_cache': True}, {'no-cache'}),
('no-cache=Set-Cookie,no-cache=Link', {'no_cache': True}, {'no-cache'}),
('no-cache=Set-Cookie', {'no_cache': 'Link'}, {'no-cache=Set-Cookie', 'no-cache=Link'}),
(
'no-cache=Set-Cookie,no-cache=Link',
{'no_cache': 'Custom'},
{'no-cache=Set-Cookie', 'no-cache=Link', 'no-cache=Custom'},
),
# Test whether private/public attributes are mutually exclusive
('private', {'private': True}, {'private'}),
('private', {'public': True}, {'public'}),
('public', {'public': True}, {'public'}),
('public', {'private': True}, {'private'}),
('must-revalidate,max-age=60,private', {'public': True}, {'must-revalidate', 'max-age=60', 'public'}),
('must-revalidate,max-age=60,public', {'private': True}, {'must-revalidate', 'max-age=60', 'private'}),
('must-revalidate,max-age=60', {'public': True}, {'must-revalidate', 'max-age=60', 'public'}),
)
cc_delim_re = re.compile(r'\s*,\s*')
for initial_cc, newheaders, expected_cc in tests:
with self.subTest(initial_cc=initial_cc, newheaders=newheaders):
response = HttpResponse()
if initial_cc is not None:
response['Cache-Control'] = initial_cc
patch_cache_control(response, **newheaders)
parts = set(cc_delim_re.split(response['Cache-Control']))
self.assertEqual(parts, expected_cc)
@override_settings(
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'KEY_PREFIX': 'cacheprefix',
},
},
)
class PrefixedCacheUtils(CacheUtils):
pass
@override_settings(
CACHE_MIDDLEWARE_SECONDS=60,
CACHE_MIDDLEWARE_KEY_PREFIX='test',
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
},
},
)
class CacheHEADTest(SimpleTestCase):
path = '/cache/test/'
factory = RequestFactory()
def tearDown(self):
cache.clear()
def _set_cache(self, request, msg):
response = HttpResponse()
response.content = msg
return UpdateCacheMiddleware().process_response(request, response)
def test_head_caches_correctly(self):
test_content = 'test content'
request = self.factory.head(self.path)
request._cache_update_cache = True
self._set_cache(request, test_content)
request = self.factory.head(self.path)
request._cache_update_cache = True
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertIsNotNone(get_cache_data)
self.assertEqual(test_content.encode(), get_cache_data.content)
def test_head_with_cached_get(self):
test_content = 'test content'
request = self.factory.get(self.path)
request._cache_update_cache = True
self._set_cache(request, test_content)
request = self.factory.head(self.path)
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertIsNotNone(get_cache_data)
self.assertEqual(test_content.encode(), get_cache_data.content)
@override_settings(
CACHE_MIDDLEWARE_KEY_PREFIX='settingsprefix',
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
},
},
LANGUAGES=[
('en', 'English'),
('es', 'Spanish'),
],
)
class CacheI18nTest(SimpleTestCase):
path = '/cache/test/'
factory = RequestFactory()
def tearDown(self):
cache.clear()
@override_settings(USE_I18N=True, USE_L10N=False, USE_TZ=False)
def test_cache_key_i18n_translation(self):
request = self.factory.get(self.path)
lang = translation.get_language()
response = HttpResponse()
key = learn_cache_key(request, response)
self.assertIn(lang, key, "Cache keys should include the language name when translation is active")
key2 = get_cache_key(request)
self.assertEqual(key, key2)
def check_accept_language_vary(self, accept_language, vary, reference_key):
request = self.factory.get(self.path)
request.META['HTTP_ACCEPT_LANGUAGE'] = accept_language
request.META['HTTP_ACCEPT_ENCODING'] = 'gzip;q=1.0, identity; q=0.5, *;q=0'
response = HttpResponse()
response['Vary'] = vary
key = learn_cache_key(request, response)
key2 = get_cache_key(request)
self.assertEqual(key, reference_key)
self.assertEqual(key2, reference_key)
@override_settings(USE_I18N=True, USE_L10N=False, USE_TZ=False)
def test_cache_key_i18n_translation_accept_language(self):
lang = translation.get_language()
self.assertEqual(lang, 'en')
request = self.factory.get(self.path)
request.META['HTTP_ACCEPT_ENCODING'] = 'gzip;q=1.0, identity; q=0.5, *;q=0'
response = HttpResponse()
response['Vary'] = 'accept-encoding'
key = learn_cache_key(request, response)
self.assertIn(lang, key, "Cache keys should include the language name when translation is active")
self.check_accept_language_vary(
'en-us',
'cookie, accept-language, accept-encoding',
key
)
self.check_accept_language_vary(
'en-US',
'cookie, accept-encoding, accept-language',
key
)
self.check_accept_language_vary(
'en-US,en;q=0.8',
'accept-encoding, accept-language, cookie',
key
)
self.check_accept_language_vary(
'en-US,en;q=0.8,ko;q=0.6',
'accept-language, cookie, accept-encoding',
key
)
self.check_accept_language_vary(
'ko-kr,ko;q=0.8,en-us;q=0.5,en;q=0.3 ',
'accept-encoding, cookie, accept-language',
key
)
self.check_accept_language_vary(
'ko-KR,ko;q=0.8,en-US;q=0.6,en;q=0.4',
'accept-language, accept-encoding, cookie',
key
)
self.check_accept_language_vary(
'ko;q=1.0,en;q=0.5',
'cookie, accept-language, accept-encoding',
key
)
self.check_accept_language_vary(
'ko, en',
'cookie, accept-encoding, accept-language',
key
)
self.check_accept_language_vary(
'ko-KR, en-US',
'accept-encoding, accept-language, cookie',
key
)
@override_settings(USE_I18N=False, USE_L10N=True, USE_TZ=False)
def test_cache_key_i18n_formatting(self):
request = self.factory.get(self.path)
lang = translation.get_language()
response = HttpResponse()
key = learn_cache_key(request, response)
self.assertIn(lang, key, "Cache keys should include the language name when formatting is active")
key2 = get_cache_key(request)
self.assertEqual(key, key2)
@override_settings(USE_I18N=False, USE_L10N=False, USE_TZ=True)
def test_cache_key_i18n_timezone(self):
request = self.factory.get(self.path)
tz = timezone.get_current_timezone_name()
response = HttpResponse()
key = learn_cache_key(request, response)
self.assertIn(tz, key, "Cache keys should include the time zone name when time zones are active")
key2 = get_cache_key(request)
self.assertEqual(key, key2)
@override_settings(USE_I18N=False, USE_L10N=False)
def test_cache_key_no_i18n(self):
request = self.factory.get(self.path)
lang = translation.get_language()
tz = timezone.get_current_timezone_name()
response = HttpResponse()
key = learn_cache_key(request, response)
self.assertNotIn(lang, key, "Cache keys shouldn't include the language name when i18n isn't active")
self.assertNotIn(tz, key, "Cache keys shouldn't include the time zone name when i18n isn't active")
@override_settings(
CACHE_MIDDLEWARE_KEY_PREFIX="test",
CACHE_MIDDLEWARE_SECONDS=60,
USE_I18N=True,
)
def test_middleware(self):
def set_cache(request, lang, msg):
translation.activate(lang)
response = HttpResponse()
response.content = msg
return UpdateCacheMiddleware().process_response(request, response)
# cache with non empty request.GET
request = self.factory.get(self.path, {'foo': 'bar', 'other': 'true'})
request._cache_update_cache = True
get_cache_data = FetchFromCacheMiddleware().process_request(request)
# first access, cache must return None
self.assertIsNone(get_cache_data)
response = HttpResponse()
content = 'Check for cache with QUERY_STRING'
response.content = content
UpdateCacheMiddleware().process_response(request, response)
get_cache_data = FetchFromCacheMiddleware().process_request(request)
# cache must return content
self.assertIsNotNone(get_cache_data)
self.assertEqual(get_cache_data.content, content.encode())
# different QUERY_STRING, cache must be empty
request = self.factory.get(self.path, {'foo': 'bar', 'somethingelse': 'true'})
request._cache_update_cache = True
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertIsNone(get_cache_data)
# i18n tests
en_message = "Hello world!"
es_message = "Hola mundo!"
request = self.factory.get(self.path)
request._cache_update_cache = True
set_cache(request, 'en', en_message)
get_cache_data = FetchFromCacheMiddleware().process_request(request)
# The cache can be recovered
self.assertIsNotNone(get_cache_data)
self.assertEqual(get_cache_data.content, en_message.encode())
# change the session language and set content
request = self.factory.get(self.path)
request._cache_update_cache = True
set_cache(request, 'es', es_message)
# change again the language
translation.activate('en')
# retrieve the content from cache
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertEqual(get_cache_data.content, en_message.encode())
# change again the language
translation.activate('es')
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertEqual(get_cache_data.content, es_message.encode())
# reset the language
translation.deactivate()
@override_settings(
CACHE_MIDDLEWARE_KEY_PREFIX="test",
CACHE_MIDDLEWARE_SECONDS=60,
)
def test_middleware_doesnt_cache_streaming_response(self):
request = self.factory.get(self.path)
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertIsNone(get_cache_data)
content = ['Check for cache with streaming content.']
response = StreamingHttpResponse(content)
UpdateCacheMiddleware().process_response(request, response)
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertIsNone(get_cache_data)
@override_settings(
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'KEY_PREFIX': 'cacheprefix'
},
},
)
class PrefixedCacheI18nTest(CacheI18nTest):
pass
def hello_world_view(request, value):
return HttpResponse('Hello World %s' % value)
def csrf_view(request):
return HttpResponse(csrf(request)['csrf_token'])
@override_settings(
CACHE_MIDDLEWARE_ALIAS='other',
CACHE_MIDDLEWARE_KEY_PREFIX='middlewareprefix',
CACHE_MIDDLEWARE_SECONDS=30,
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
},
'other': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'other',
'TIMEOUT': '1',
},
},
)
class CacheMiddlewareTest(SimpleTestCase):
factory = RequestFactory()
def setUp(self):
self.default_cache = caches['default']
self.other_cache = caches['other']
def tearDown(self):
self.default_cache.clear()
self.other_cache.clear()
super().tearDown()
def test_constructor(self):
"""
Ensure the constructor is correctly distinguishing between usage of CacheMiddleware as
Middleware vs. usage of CacheMiddleware as view decorator and setting attributes
appropriately.
"""
# If no arguments are passed in construction, it's being used as middleware.
middleware = CacheMiddleware()
# Now test object attributes against values defined in setUp above
self.assertEqual(middleware.cache_timeout, 30)
self.assertEqual(middleware.key_prefix, 'middlewareprefix')
self.assertEqual(middleware.cache_alias, 'other')
# If arguments are being passed in construction, it's being used as a decorator.
# First, test with "defaults":
as_view_decorator = CacheMiddleware(cache_alias=None, key_prefix=None)
self.assertEqual(as_view_decorator.cache_timeout, 30) # Timeout value for 'default' cache, i.e. 30
self.assertEqual(as_view_decorator.key_prefix, '')
# Value of DEFAULT_CACHE_ALIAS from django.core.cache
self.assertEqual(as_view_decorator.cache_alias, 'default')
# Next, test with custom values:
as_view_decorator_with_custom = CacheMiddleware(cache_timeout=60, cache_alias='other', key_prefix='foo')
self.assertEqual(as_view_decorator_with_custom.cache_timeout, 60)
self.assertEqual(as_view_decorator_with_custom.key_prefix, 'foo')
self.assertEqual(as_view_decorator_with_custom.cache_alias, 'other')
def test_middleware(self):
middleware = CacheMiddleware()
prefix_middleware = CacheMiddleware(key_prefix='prefix1')
timeout_middleware = CacheMiddleware(cache_timeout=1)
request = self.factory.get('/view/')
# Put the request through the request middleware
result = middleware.process_request(request)
self.assertIsNone(result)
response = hello_world_view(request, '1')
# Now put the response through the response middleware
response = middleware.process_response(request, response)
# Repeating the request should result in a cache hit
result = middleware.process_request(request)
self.assertIsNotNone(result)
self.assertEqual(result.content, b'Hello World 1')
# The same request through a different middleware won't hit
result = prefix_middleware.process_request(request)
self.assertIsNone(result)
# The same request with a timeout _will_ hit
result = timeout_middleware.process_request(request)
self.assertIsNotNone(result)
self.assertEqual(result.content, b'Hello World 1')
def test_view_decorator(self):
# decorate the same view with different cache decorators
default_view = cache_page(3)(hello_world_view)
default_with_prefix_view = cache_page(3, key_prefix='prefix1')(hello_world_view)
explicit_default_view = cache_page(3, cache='default')(hello_world_view)
explicit_default_with_prefix_view = cache_page(3, cache='default', key_prefix='prefix1')(hello_world_view)
other_view = cache_page(1, cache='other')(hello_world_view)
other_with_prefix_view = cache_page(1, cache='other', key_prefix='prefix2')(hello_world_view)
request = self.factory.get('/view/')
# Request the view once
response = default_view(request, '1')
self.assertEqual(response.content, b'Hello World 1')
# Request again -- hit the cache
response = default_view(request, '2')
self.assertEqual(response.content, b'Hello World 1')
# Requesting the same view with the explicit cache should yield the same result
response = explicit_default_view(request, '3')
self.assertEqual(response.content, b'Hello World 1')
# Requesting with a prefix will hit a different cache key
response = explicit_default_with_prefix_view(request, '4')
self.assertEqual(response.content, b'Hello World 4')
# Hitting the same view again gives a cache hit
response = explicit_default_with_prefix_view(request, '5')
self.assertEqual(response.content, b'Hello World 4')
# And going back to the implicit cache will hit the same cache
response = default_with_prefix_view(request, '6')
self.assertEqual(response.content, b'Hello World 4')
# Requesting from an alternate cache won't hit cache
response = other_view(request, '7')
self.assertEqual(response.content, b'Hello World 7')
# But a repeated hit will hit cache
response = other_view(request, '8')
self.assertEqual(response.content, b'Hello World 7')
# And prefixing the alternate cache yields yet another cache entry
response = other_with_prefix_view(request, '9')
self.assertEqual(response.content, b'Hello World 9')
# But if we wait a couple of seconds...
time.sleep(2)
# ... the default cache will still hit
caches['default']
response = default_view(request, '11')
self.assertEqual(response.content, b'Hello World 1')
# ... the default cache with a prefix will still hit
response = default_with_prefix_view(request, '12')
self.assertEqual(response.content, b'Hello World 4')
# ... the explicit default cache will still hit
response = explicit_default_view(request, '13')
self.assertEqual(response.content, b'Hello World 1')
# ... the explicit default cache with a prefix will still hit
response = explicit_default_with_prefix_view(request, '14')
self.assertEqual(response.content, b'Hello World 4')
# .. but a rapidly expiring cache won't hit
response = other_view(request, '15')
self.assertEqual(response.content, b'Hello World 15')
# .. even if it has a prefix
response = other_with_prefix_view(request, '16')
self.assertEqual(response.content, b'Hello World 16')
def test_cache_page_timeout(self):
# Page timeout takes precedence over the "max-age" section of the
# "Cache-Control".
tests = [
(1, 3), # max_age < page_timeout.
(3, 1), # max_age > page_timeout.
]
for max_age, page_timeout in tests:
with self.subTest(max_age=max_age, page_timeout=page_timeout):
view = cache_page(timeout=page_timeout)(
cache_control(max_age=max_age)(hello_world_view)
)
request = self.factory.get('/view/')
response = view(request, '1')
self.assertEqual(response.content, b'Hello World 1')
time.sleep(1)
response = view(request, '2')
self.assertEqual(
response.content,
b'Hello World 1' if page_timeout > max_age else b'Hello World 2',
)
cache.clear()
def test_cached_control_private_not_cached(self):
"""Responses with 'Cache-Control: private' are not cached."""
view_with_private_cache = cache_page(3)(cache_control(private=True)(hello_world_view))
request = self.factory.get('/view/')
response = view_with_private_cache(request, '1')
self.assertEqual(response.content, b'Hello World 1')
response = view_with_private_cache(request, '2')
self.assertEqual(response.content, b'Hello World 2')
def test_sensitive_cookie_not_cached(self):
"""
Django must prevent caching of responses that set a user-specific (and
maybe security sensitive) cookie in response to a cookie-less request.
"""
csrf_middleware = CsrfViewMiddleware()
cache_middleware = CacheMiddleware()
request = self.factory.get('/view/')
self.assertIsNone(cache_middleware.process_request(request))
csrf_middleware.process_view(request, csrf_view, (), {})
response = csrf_view(request)
response = csrf_middleware.process_response(request, response)
response = cache_middleware.process_response(request, response)
# Inserting a CSRF cookie in a cookie-less request prevented caching.
self.assertIsNone(cache_middleware.process_request(request))
def test_304_response_has_http_caching_headers_but_not_cached(self):
original_view = mock.Mock(return_value=HttpResponseNotModified())
view = cache_page(2)(original_view)
request = self.factory.get('/view/')
# The view shouldn't be cached on the second call.
view(request).close()
response = view(request)
response.close()
self.assertEqual(original_view.call_count, 2)
self.assertIsInstance(response, HttpResponseNotModified)
self.assertIn('Cache-Control', response)
self.assertIn('Expires', response)
@override_settings(
CACHE_MIDDLEWARE_KEY_PREFIX='settingsprefix',
CACHE_MIDDLEWARE_SECONDS=1,
CACHES={
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
},
},
USE_I18N=False,
)
class TestWithTemplateResponse(SimpleTestCase):
"""
Tests various headers w/ TemplateResponse.
Most are probably redundant since they manipulate the same object
anyway but the ETag header is 'special' because it relies on the
content being complete (which is not necessarily always the case
with a TemplateResponse)
"""
path = '/cache/test/'
factory = RequestFactory()
def tearDown(self):
cache.clear()
def test_patch_vary_headers(self):
headers = (
# Initial vary, new headers, resulting vary.
(None, ('Accept-Encoding',), 'Accept-Encoding'),
('Accept-Encoding', ('accept-encoding',), 'Accept-Encoding'),
('Accept-Encoding', ('ACCEPT-ENCODING',), 'Accept-Encoding'),
('Cookie', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
('Cookie, Accept-Encoding', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
(None, ('Accept-Encoding', 'COOKIE'), 'Accept-Encoding, COOKIE'),
('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
('Cookie , Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
)
for initial_vary, newheaders, resulting_vary in headers:
with self.subTest(initial_vary=initial_vary, newheaders=newheaders):
template = engines['django'].from_string("This is a test")
response = TemplateResponse(HttpRequest(), template)
if initial_vary is not None:
response['Vary'] = initial_vary
patch_vary_headers(response, newheaders)
self.assertEqual(response['Vary'], resulting_vary)
def test_get_cache_key(self):
request = self.factory.get(self.path)
template = engines['django'].from_string("This is a test")
response = TemplateResponse(HttpRequest(), template)
key_prefix = 'localprefix'
# Expect None if no headers have been set yet.
self.assertIsNone(get_cache_key(request))
# Set headers to an empty list.
learn_cache_key(request, response)
self.assertEqual(
get_cache_key(request),
'views.decorators.cache.cache_page.settingsprefix.GET.'
'58a0a05c8a5620f813686ff969c26853.d41d8cd98f00b204e9800998ecf8427e'
)
# A specified key_prefix is taken into account.
learn_cache_key(request, response, key_prefix=key_prefix)
self.assertEqual(
get_cache_key(request, key_prefix=key_prefix),
'views.decorators.cache.cache_page.localprefix.GET.'
'58a0a05c8a5620f813686ff969c26853.d41d8cd98f00b204e9800998ecf8427e'
)
def test_get_cache_key_with_query(self):
request = self.factory.get(self.path, {'test': 1})
template = engines['django'].from_string("This is a test")
response = TemplateResponse(HttpRequest(), template)
# Expect None if no headers have been set yet.
self.assertIsNone(get_cache_key(request))
# Set headers to an empty list.
learn_cache_key(request, response)
# The querystring is taken into account.
self.assertEqual(
get_cache_key(request),
'views.decorators.cache.cache_page.settingsprefix.GET.'
'0f1c2d56633c943073c4569d9a9502fe.d41d8cd98f00b204e9800998ecf8427e'
)
class TestMakeTemplateFragmentKey(SimpleTestCase):
def test_without_vary_on(self):
key = make_template_fragment_key('a.fragment')
self.assertEqual(key, 'template.cache.a.fragment.d41d8cd98f00b204e9800998ecf8427e')
def test_with_one_vary_on(self):
key = make_template_fragment_key('foo', ['abc'])
self.assertEqual(key, 'template.cache.foo.493e283d571a73056196f1a68efd0f66')
def test_with_many_vary_on(self):
key = make_template_fragment_key('bar', ['abc', 'def'])
self.assertEqual(key, 'template.cache.bar.17c1a507a0cb58384f4c639067a93520')
def test_proper_escaping(self):
key = make_template_fragment_key('spam', ['abc:def%'])
self.assertEqual(key, 'template.cache.spam.06c8ae8e8c430b69fb0a6443504153dc')
def test_with_ints_vary_on(self):
key = make_template_fragment_key('foo', [1, 2, 3, 4, 5])
self.assertEqual(key, 'template.cache.foo.7ae8fd2e0d25d651c683bdeebdb29461')
def test_with_unicode_vary_on(self):
key = make_template_fragment_key('foo', ['42º', '😀'])
self.assertEqual(key, 'template.cache.foo.7ced1c94e543668590ba39b3c08b0237')
def test_long_vary_on(self):
key = make_template_fragment_key('foo', ['x' * 10000])
self.assertEqual(key, 'template.cache.foo.3670b349b5124aa56bdb50678b02b23a')
class CacheHandlerTest(SimpleTestCase):
def test_same_instance(self):
"""
Attempting to retrieve the same alias should yield the same instance.
"""
cache1 = caches['default']
cache2 = caches['default']
self.assertIs(cache1, cache2)
def test_per_thread(self):
"""
Requesting the same alias from separate threads should yield separate
instances.
"""
c = []
def runner():
c.append(caches['default'])
for x in range(2):
t = threading.Thread(target=runner)
t.start()
t.join()
self.assertIsNot(c[0], c[1])
|
cb069651676d854ed2d8f70892dd82aeca87458a9d9b61823b1f6ccb4311eced | import hashlib
import unittest
from django.test import SimpleTestCase
from django.utils.crypto import (
InvalidAlgorithm, constant_time_compare, pbkdf2, salted_hmac,
)
class TestUtilsCryptoMisc(SimpleTestCase):
def test_constant_time_compare(self):
# It's hard to test for constant time, just test the result.
self.assertTrue(constant_time_compare(b'spam', b'spam'))
self.assertFalse(constant_time_compare(b'spam', b'eggs'))
self.assertTrue(constant_time_compare('spam', 'spam'))
self.assertFalse(constant_time_compare('spam', 'eggs'))
def test_salted_hmac(self):
tests = [
((b'salt', b'value'), {}, 'b51a2e619c43b1ca4f91d15c57455521d71d61eb'),
(('salt', 'value'), {}, 'b51a2e619c43b1ca4f91d15c57455521d71d61eb'),
(
('salt', 'value'),
{'secret': 'abcdefg'},
'8bbee04ccddfa24772d1423a0ba43bd0c0e24b76',
),
(
('salt', 'value'),
{'secret': 'x' * hashlib.sha1().block_size},
'bd3749347b412b1b0a9ea65220e55767ac8e96b0',
),
(
('salt', 'value'),
{'algorithm': 'sha256'},
'ee0bf789e4e009371a5372c90f73fcf17695a8439c9108b0480f14e347b3f9ec',
),
(
('salt', 'value'),
{
'algorithm': 'blake2b',
'secret': 'x' * hashlib.blake2b().block_size,
},
'fc6b9800a584d40732a07fa33fb69c35211269441823bca431a143853c32f'
'e836cf19ab881689528ede647dac412170cd5d3407b44c6d0f44630690c54'
'ad3d58',
),
]
for args, kwargs, digest in tests:
with self.subTest(args=args, kwargs=kwargs):
self.assertEqual(salted_hmac(*args, **kwargs).hexdigest(), digest)
def test_invalid_algorithm(self):
msg = "'whatever' is not an algorithm accepted by the hashlib module."
with self.assertRaisesMessage(InvalidAlgorithm, msg):
salted_hmac('salt', 'value', algorithm='whatever')
class TestUtilsCryptoPBKDF2(unittest.TestCase):
# http://tools.ietf.org/html/draft-josefsson-pbkdf2-test-vectors-06
rfc_vectors = [
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "0c60c80f961f0e71f3a9b524af6012062fe037a6",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 2,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 4096,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "4b007901b765489abead49d926f721d065a429c1",
},
# # this takes way too long :(
# {
# "args": {
# "password": "password",
# "salt": "salt",
# "iterations": 16777216,
# "dklen": 20,
# "digest": hashlib.sha1,
# },
# "result": "eefe3d61cd4da4e4e9945b3d6ba2158c2634e984",
# },
{
"args": {
"password": "passwordPASSWORDpassword",
"salt": "saltSALTsaltSALTsaltSALTsaltSALTsalt",
"iterations": 4096,
"dklen": 25,
"digest": hashlib.sha1,
},
"result": "3d2eec4fe41c849b80c8d83662c0e44a8b291a964cf2f07038",
},
{
"args": {
"password": "pass\0word",
"salt": "sa\0lt",
"iterations": 4096,
"dklen": 16,
"digest": hashlib.sha1,
},
"result": "56fa6aa75548099dcc37d7f03425e0c3",
},
]
regression_vectors = [
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha256,
},
"result": "120fb6cffcf8b32c43e7225256c4f837a86548c9",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha512,
},
"result": "867f70cf1ade02cff3752599a3a53dc4af34c7a6",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1000,
"dklen": 0,
"digest": hashlib.sha512,
},
"result": ("afe6c5530785b6cc6b1c6453384731bd5ee432ee"
"549fd42fb6695779ad8a1c5bf59de69c48f774ef"
"c4007d5298f9033c0241d5ab69305e7b64eceeb8d"
"834cfec"),
},
# Check leading zeros are not stripped (#17481)
{
"args": {
"password": b'\xba',
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": '0053d3b91a7f1e54effebd6d68771e8a6e0b2c5b',
},
]
def test_public_vectors(self):
for vector in self.rfc_vectors:
result = pbkdf2(**vector['args'])
self.assertEqual(result.hex(), vector['result'])
def test_regression_vectors(self):
for vector in self.regression_vectors:
result = pbkdf2(**vector['args'])
self.assertEqual(result.hex(), vector['result'])
def test_default_hmac_alg(self):
kwargs = {'password': b'password', 'salt': b'salt', 'iterations': 1, 'dklen': 20}
self.assertEqual(pbkdf2(**kwargs), hashlib.pbkdf2_hmac(hash_name=hashlib.sha256().name, **kwargs))
|
888f876101821002fcd85068f83f7779d82b85a54204171ae13a060759b7886a | import threading
from datetime import datetime, timedelta
from unittest import mock
from django.core.exceptions import MultipleObjectsReturned, ObjectDoesNotExist
from django.db import DEFAULT_DB_ALIAS, DatabaseError, connections, models
from django.db.models.manager import BaseManager
from django.db.models.query import MAX_GET_RESULTS, EmptyQuerySet
from django.test import (
SimpleTestCase, TestCase, TransactionTestCase, skipUnlessDBFeature,
)
from django.utils.translation import gettext_lazy
from .models import (
Article, ArticleSelectOnSave, FeaturedArticle, PrimaryKeyWithDefault,
SelfRef,
)
class ModelInstanceCreationTests(TestCase):
def test_object_is_not_written_to_database_until_save_was_called(self):
a = Article(
id=None,
headline='Parrot programs in Python',
pub_date=datetime(2005, 7, 28),
)
self.assertIsNone(a.id)
self.assertEqual(Article.objects.all().count(), 0)
# Save it into the database. You have to call save() explicitly.
a.save()
self.assertIsNotNone(a.id)
self.assertEqual(Article.objects.all().count(), 1)
def test_can_initialize_model_instance_using_positional_arguments(self):
"""
You can initialize a model instance using positional arguments,
which should match the field order as defined in the model.
"""
a = Article(None, 'Second article', datetime(2005, 7, 29))
a.save()
self.assertEqual(a.headline, 'Second article')
self.assertEqual(a.pub_date, datetime(2005, 7, 29, 0, 0))
def test_can_create_instance_using_kwargs(self):
a = Article(
id=None,
headline='Third article',
pub_date=datetime(2005, 7, 30),
)
a.save()
self.assertEqual(a.headline, 'Third article')
self.assertEqual(a.pub_date, datetime(2005, 7, 30, 0, 0))
def test_autofields_generate_different_values_for_each_instance(self):
a1 = Article.objects.create(headline='First', pub_date=datetime(2005, 7, 30, 0, 0))
a2 = Article.objects.create(headline='First', pub_date=datetime(2005, 7, 30, 0, 0))
a3 = Article.objects.create(headline='First', pub_date=datetime(2005, 7, 30, 0, 0))
self.assertNotEqual(a3.id, a1.id)
self.assertNotEqual(a3.id, a2.id)
def test_can_mix_and_match_position_and_kwargs(self):
# You can also mix and match position and keyword arguments, but
# be sure not to duplicate field information.
a = Article(None, 'Fourth article', pub_date=datetime(2005, 7, 31))
a.save()
self.assertEqual(a.headline, 'Fourth article')
def test_cannot_create_instance_with_invalid_kwargs(self):
with self.assertRaisesMessage(TypeError, "Article() got an unexpected keyword argument 'foo'"):
Article(
id=None,
headline='Some headline',
pub_date=datetime(2005, 7, 31),
foo='bar',
)
def test_can_leave_off_value_for_autofield_and_it_gets_value_on_save(self):
"""
You can leave off the value for an AutoField when creating an
object, because it'll get filled in automatically when you save().
"""
a = Article(headline='Article 5', pub_date=datetime(2005, 7, 31))
a.save()
self.assertEqual(a.headline, 'Article 5')
self.assertIsNotNone(a.id)
def test_leaving_off_a_field_with_default_set_the_default_will_be_saved(self):
a = Article(pub_date=datetime(2005, 7, 31))
a.save()
self.assertEqual(a.headline, 'Default headline')
def test_for_datetimefields_saves_as_much_precision_as_was_given(self):
"""as much precision in *seconds*"""
a1 = Article(
headline='Article 7',
pub_date=datetime(2005, 7, 31, 12, 30),
)
a1.save()
self.assertEqual(Article.objects.get(id__exact=a1.id).pub_date, datetime(2005, 7, 31, 12, 30))
a2 = Article(
headline='Article 8',
pub_date=datetime(2005, 7, 31, 12, 30, 45),
)
a2.save()
self.assertEqual(Article.objects.get(id__exact=a2.id).pub_date, datetime(2005, 7, 31, 12, 30, 45))
def test_saving_an_object_again_does_not_create_a_new_object(self):
a = Article(headline='original', pub_date=datetime(2014, 5, 16))
a.save()
current_id = a.id
a.save()
self.assertEqual(a.id, current_id)
a.headline = 'Updated headline'
a.save()
self.assertEqual(a.id, current_id)
def test_querysets_checking_for_membership(self):
headlines = [
'Parrot programs in Python', 'Second article', 'Third article']
some_pub_date = datetime(2014, 5, 16, 12, 1)
for headline in headlines:
Article(headline=headline, pub_date=some_pub_date).save()
a = Article(headline='Some headline', pub_date=some_pub_date)
a.save()
# You can use 'in' to test for membership...
self.assertIn(a, Article.objects.all())
# ... but there will often be more efficient ways if that is all you need:
self.assertTrue(Article.objects.filter(id=a.id).exists())
def test_save_primary_with_default(self):
# An UPDATE attempt is skipped when a primary key has default.
with self.assertNumQueries(1):
PrimaryKeyWithDefault().save()
class ModelTest(TestCase):
def test_objects_attribute_is_only_available_on_the_class_itself(self):
with self.assertRaisesMessage(AttributeError, "Manager isn't accessible via Article instances"):
getattr(Article(), "objects",)
self.assertFalse(hasattr(Article(), 'objects'))
self.assertTrue(hasattr(Article, 'objects'))
def test_queryset_delete_removes_all_items_in_that_queryset(self):
headlines = [
'An article', 'Article One', 'Amazing article', 'Boring article']
some_pub_date = datetime(2014, 5, 16, 12, 1)
for headline in headlines:
Article(headline=headline, pub_date=some_pub_date).save()
self.assertQuerysetEqual(
Article.objects.all().order_by('headline'),
["<Article: Amazing article>",
"<Article: An article>",
"<Article: Article One>",
"<Article: Boring article>"]
)
Article.objects.filter(headline__startswith='A').delete()
self.assertQuerysetEqual(Article.objects.all().order_by('headline'), ["<Article: Boring article>"])
def test_not_equal_and_equal_operators_behave_as_expected_on_instances(self):
some_pub_date = datetime(2014, 5, 16, 12, 1)
a1 = Article.objects.create(headline='First', pub_date=some_pub_date)
a2 = Article.objects.create(headline='Second', pub_date=some_pub_date)
self.assertNotEqual(a1, a2)
self.assertEqual(a1, Article.objects.get(id__exact=a1.id))
self.assertNotEqual(Article.objects.get(id__exact=a1.id), Article.objects.get(id__exact=a2.id))
def test_microsecond_precision(self):
a9 = Article(
headline='Article 9',
pub_date=datetime(2005, 7, 31, 12, 30, 45, 180),
)
a9.save()
self.assertEqual(Article.objects.get(pk=a9.pk).pub_date, datetime(2005, 7, 31, 12, 30, 45, 180))
def test_manually_specify_primary_key(self):
# You can manually specify the primary key when creating a new object.
a101 = Article(
id=101,
headline='Article 101',
pub_date=datetime(2005, 7, 31, 12, 30, 45),
)
a101.save()
a101 = Article.objects.get(pk=101)
self.assertEqual(a101.headline, 'Article 101')
def test_create_method(self):
# You can create saved objects in a single step
a10 = Article.objects.create(
headline="Article 10",
pub_date=datetime(2005, 7, 31, 12, 30, 45),
)
self.assertEqual(Article.objects.get(headline="Article 10"), a10)
def test_year_lookup_edge_case(self):
# Edge-case test: A year lookup should retrieve all objects in
# the given year, including Jan. 1 and Dec. 31.
Article.objects.create(
headline='Article 11',
pub_date=datetime(2008, 1, 1),
)
Article.objects.create(
headline='Article 12',
pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999),
)
self.assertQuerysetEqual(
Article.objects.filter(pub_date__year=2008),
["<Article: Article 11>", "<Article: Article 12>"]
)
def test_unicode_data(self):
# Unicode data works, too.
a = Article(
headline='\u6797\u539f \u3081\u3050\u307f',
pub_date=datetime(2005, 7, 28),
)
a.save()
self.assertEqual(Article.objects.get(pk=a.id).headline, '\u6797\u539f \u3081\u3050\u307f')
def test_hash_function(self):
# Model instances have a hash function, so they can be used in sets
# or as dictionary keys. Two models compare as equal if their primary
# keys are equal.
a10 = Article.objects.create(
headline="Article 10",
pub_date=datetime(2005, 7, 31, 12, 30, 45),
)
a11 = Article.objects.create(
headline='Article 11',
pub_date=datetime(2008, 1, 1),
)
a12 = Article.objects.create(
headline='Article 12',
pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999),
)
s = {a10, a11, a12}
self.assertIn(Article.objects.get(headline='Article 11'), s)
def test_extra_method_select_argument_with_dashes_and_values(self):
# The 'select' argument to extra() supports names with dashes in
# them, as long as you use values().
Article.objects.bulk_create([
Article(headline='Article 10', pub_date=datetime(2005, 7, 31, 12, 30, 45)),
Article(headline='Article 11', pub_date=datetime(2008, 1, 1)),
Article(headline='Article 12', pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999)),
])
dicts = Article.objects.filter(
pub_date__year=2008).extra(
select={'dashed-value': '1'}).values('headline', 'dashed-value')
self.assertEqual(
[sorted(d.items()) for d in dicts],
[[('dashed-value', 1), ('headline', 'Article 11')], [('dashed-value', 1), ('headline', 'Article 12')]]
)
def test_extra_method_select_argument_with_dashes(self):
# If you use 'select' with extra() and names containing dashes on a
# query that's *not* a values() query, those extra 'select' values
# will silently be ignored.
Article.objects.bulk_create([
Article(headline='Article 10', pub_date=datetime(2005, 7, 31, 12, 30, 45)),
Article(headline='Article 11', pub_date=datetime(2008, 1, 1)),
Article(headline='Article 12', pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999)),
])
articles = Article.objects.filter(
pub_date__year=2008).extra(select={'dashed-value': '1', 'undashedvalue': '2'})
self.assertEqual(articles[0].undashedvalue, 2)
def test_create_relation_with_gettext_lazy(self):
"""
gettext_lazy objects work when saving model instances
through various methods. Refs #10498.
"""
notlazy = 'test'
lazy = gettext_lazy(notlazy)
Article.objects.create(headline=lazy, pub_date=datetime.now())
article = Article.objects.get()
self.assertEqual(article.headline, notlazy)
# test that assign + save works with Promise objects
article.headline = lazy
article.save()
self.assertEqual(article.headline, notlazy)
# test .update()
Article.objects.update(headline=lazy)
article = Article.objects.get()
self.assertEqual(article.headline, notlazy)
# still test bulk_create()
Article.objects.all().delete()
Article.objects.bulk_create([Article(headline=lazy, pub_date=datetime.now())])
article = Article.objects.get()
self.assertEqual(article.headline, notlazy)
def test_emptyqs(self):
msg = "EmptyQuerySet can't be instantiated"
with self.assertRaisesMessage(TypeError, msg):
EmptyQuerySet()
self.assertIsInstance(Article.objects.none(), EmptyQuerySet)
self.assertNotIsInstance('', EmptyQuerySet)
def test_emptyqs_values(self):
# test for #15959
Article.objects.create(headline='foo', pub_date=datetime.now())
with self.assertNumQueries(0):
qs = Article.objects.none().values_list('pk')
self.assertIsInstance(qs, EmptyQuerySet)
self.assertEqual(len(qs), 0)
def test_emptyqs_customqs(self):
# A hacky test for custom QuerySet subclass - refs #17271
Article.objects.create(headline='foo', pub_date=datetime.now())
class CustomQuerySet(models.QuerySet):
def do_something(self):
return 'did something'
qs = Article.objects.all()
qs.__class__ = CustomQuerySet
qs = qs.none()
with self.assertNumQueries(0):
self.assertEqual(len(qs), 0)
self.assertIsInstance(qs, EmptyQuerySet)
self.assertEqual(qs.do_something(), 'did something')
def test_emptyqs_values_order(self):
# Tests for ticket #17712
Article.objects.create(headline='foo', pub_date=datetime.now())
with self.assertNumQueries(0):
self.assertEqual(len(Article.objects.none().values_list('id').order_by('id')), 0)
with self.assertNumQueries(0):
self.assertEqual(len(Article.objects.none().filter(
id__in=Article.objects.values_list('id', flat=True))), 0)
@skipUnlessDBFeature('can_distinct_on_fields')
def test_emptyqs_distinct(self):
# Tests for #19426
Article.objects.create(headline='foo', pub_date=datetime.now())
with self.assertNumQueries(0):
self.assertEqual(len(Article.objects.none().distinct('headline', 'pub_date')), 0)
def test_ticket_20278(self):
sr = SelfRef.objects.create()
with self.assertRaises(ObjectDoesNotExist):
SelfRef.objects.get(selfref=sr)
def test_eq(self):
self.assertEqual(Article(id=1), Article(id=1))
self.assertNotEqual(Article(id=1), object())
self.assertNotEqual(object(), Article(id=1))
a = Article()
self.assertEqual(a, a)
self.assertEqual(a, mock.ANY)
self.assertNotEqual(Article(), a)
def test_hash(self):
# Value based on PK
self.assertEqual(hash(Article(id=1)), hash(1))
msg = 'Model instances without primary key value are unhashable'
with self.assertRaisesMessage(TypeError, msg):
# No PK value -> unhashable (because save() would then change
# hash)
hash(Article())
def test_missing_hash_not_inherited(self):
class NoHash(models.Model):
def __eq__(self, other):
return super.__eq__(other)
with self.assertRaisesMessage(TypeError, "unhashable type: 'NoHash'"):
hash(NoHash(id=1))
def test_specified_parent_hash_inherited(self):
class ParentHash(models.Model):
def __eq__(self, other):
return super.__eq__(other)
__hash__ = models.Model.__hash__
self.assertEqual(hash(ParentHash(id=1)), 1)
def test_delete_and_access_field(self):
# Accessing a field after it's deleted from a model reloads its value.
pub_date = datetime.now()
article = Article.objects.create(headline='foo', pub_date=pub_date)
new_pub_date = article.pub_date + timedelta(days=10)
article.headline = 'bar'
article.pub_date = new_pub_date
del article.headline
with self.assertNumQueries(1):
self.assertEqual(article.headline, 'foo')
# Fields that weren't deleted aren't reloaded.
self.assertEqual(article.pub_date, new_pub_date)
def test_multiple_objects_max_num_fetched(self):
max_results = MAX_GET_RESULTS - 1
Article.objects.bulk_create(
Article(headline='Area %s' % i, pub_date=datetime(2005, 7, 28))
for i in range(max_results)
)
self.assertRaisesMessage(
MultipleObjectsReturned,
'get() returned more than one Article -- it returned %d!' % max_results,
Article.objects.get,
headline__startswith='Area',
)
Article.objects.create(headline='Area %s' % max_results, pub_date=datetime(2005, 7, 28))
self.assertRaisesMessage(
MultipleObjectsReturned,
'get() returned more than one Article -- it returned more than %d!' % max_results,
Article.objects.get,
headline__startswith='Area',
)
class ModelLookupTest(TestCase):
@classmethod
def setUpTestData(cls):
# Create an Article.
cls.a = Article(
id=None,
headline='Swallow programs in Python',
pub_date=datetime(2005, 7, 28),
)
# Save it into the database. You have to call save() explicitly.
cls.a.save()
def test_all_lookup(self):
# Change values by changing the attributes, then calling save().
self.a.headline = 'Parrot programs in Python'
self.a.save()
# Article.objects.all() returns all the articles in the database.
self.assertQuerysetEqual(Article.objects.all(), ['<Article: Parrot programs in Python>'])
def test_rich_lookup(self):
# Django provides a rich database lookup API.
self.assertEqual(Article.objects.get(id__exact=self.a.id), self.a)
self.assertEqual(Article.objects.get(headline__startswith='Swallow'), self.a)
self.assertEqual(Article.objects.get(pub_date__year=2005), self.a)
self.assertEqual(Article.objects.get(pub_date__year=2005, pub_date__month=7), self.a)
self.assertEqual(Article.objects.get(pub_date__year=2005, pub_date__month=7, pub_date__day=28), self.a)
self.assertEqual(Article.objects.get(pub_date__week_day=5), self.a)
def test_equal_lookup(self):
# The "__exact" lookup type can be omitted, as a shortcut.
self.assertEqual(Article.objects.get(id=self.a.id), self.a)
self.assertEqual(Article.objects.get(headline='Swallow programs in Python'), self.a)
self.assertQuerysetEqual(
Article.objects.filter(pub_date__year=2005),
['<Article: Swallow programs in Python>'],
)
self.assertQuerysetEqual(
Article.objects.filter(pub_date__year=2004),
[],
)
self.assertQuerysetEqual(
Article.objects.filter(pub_date__year=2005, pub_date__month=7),
['<Article: Swallow programs in Python>'],
)
self.assertQuerysetEqual(
Article.objects.filter(pub_date__week_day=5),
['<Article: Swallow programs in Python>'],
)
self.assertQuerysetEqual(
Article.objects.filter(pub_date__week_day=6),
[],
)
def test_does_not_exist(self):
# Django raises an Article.DoesNotExist exception for get() if the
# parameters don't match any object.
with self.assertRaisesMessage(ObjectDoesNotExist, "Article matching query does not exist."):
Article.objects.get(id__exact=2000,)
# To avoid dict-ordering related errors check only one lookup
# in single assert.
with self.assertRaises(ObjectDoesNotExist):
Article.objects.get(pub_date__year=2005, pub_date__month=8)
with self.assertRaisesMessage(ObjectDoesNotExist, "Article matching query does not exist."):
Article.objects.get(pub_date__week_day=6,)
def test_lookup_by_primary_key(self):
# Lookup by a primary key is the most common case, so Django
# provides a shortcut for primary-key exact lookups.
# The following is identical to articles.get(id=a.id).
self.assertEqual(Article.objects.get(pk=self.a.id), self.a)
# pk can be used as a shortcut for the primary key name in any query.
self.assertQuerysetEqual(Article.objects.filter(pk__in=[self.a.id]), ["<Article: Swallow programs in Python>"])
# Model instances of the same type and same ID are considered equal.
a = Article.objects.get(pk=self.a.id)
b = Article.objects.get(pk=self.a.id)
self.assertEqual(a, b)
def test_too_many(self):
# Create a very similar object
a = Article(
id=None,
headline='Swallow bites Python',
pub_date=datetime(2005, 7, 28),
)
a.save()
self.assertEqual(Article.objects.count(), 2)
# Django raises an Article.MultipleObjectsReturned exception if the
# lookup matches more than one object
msg = "get() returned more than one Article -- it returned 2!"
with self.assertRaisesMessage(MultipleObjectsReturned, msg):
Article.objects.get(headline__startswith='Swallow',)
with self.assertRaisesMessage(MultipleObjectsReturned, msg):
Article.objects.get(pub_date__year=2005,)
with self.assertRaisesMessage(MultipleObjectsReturned, msg):
Article.objects.get(pub_date__year=2005, pub_date__month=7)
class ConcurrentSaveTests(TransactionTestCase):
available_apps = ['basic']
@skipUnlessDBFeature('test_db_allows_multiple_connections')
def test_concurrent_delete_with_save(self):
"""
Test fetching, deleting and finally saving an object - we should get
an insert in this case.
"""
a = Article.objects.create(headline='foo', pub_date=datetime.now())
exceptions = []
def deleter():
try:
# Do not delete a directly - doing so alters its state.
Article.objects.filter(pk=a.pk).delete()
except Exception as e:
exceptions.append(e)
finally:
connections[DEFAULT_DB_ALIAS].close()
self.assertEqual(len(exceptions), 0)
t = threading.Thread(target=deleter)
t.start()
t.join()
a.save()
self.assertEqual(Article.objects.get(pk=a.pk).headline, 'foo')
class ManagerTest(SimpleTestCase):
QUERYSET_PROXY_METHODS = [
'none',
'count',
'dates',
'datetimes',
'distinct',
'extra',
'get',
'get_or_create',
'update_or_create',
'create',
'bulk_create',
'bulk_update',
'filter',
'aggregate',
'annotate',
'complex_filter',
'exclude',
'in_bulk',
'iterator',
'earliest',
'latest',
'first',
'last',
'order_by',
'select_for_update',
'select_related',
'prefetch_related',
'values',
'values_list',
'update',
'reverse',
'defer',
'only',
'using',
'exists',
'explain',
'_insert',
'_update',
'raw',
'union',
'intersection',
'difference',
]
def test_manager_methods(self):
"""
This test ensures that the correct set of methods from `QuerySet`
are copied onto `Manager`.
It's particularly useful to prevent accidentally leaking new methods
into `Manager`. New `QuerySet` methods that should also be copied onto
`Manager` will need to be added to `ManagerTest.QUERYSET_PROXY_METHODS`.
"""
self.assertEqual(
sorted(BaseManager._get_queryset_methods(models.QuerySet)),
sorted(self.QUERYSET_PROXY_METHODS),
)
class SelectOnSaveTests(TestCase):
def test_select_on_save(self):
a1 = Article.objects.create(pub_date=datetime.now())
with self.assertNumQueries(1):
a1.save()
asos = ArticleSelectOnSave.objects.create(pub_date=datetime.now())
with self.assertNumQueries(2):
asos.save()
with self.assertNumQueries(1):
asos.save(force_update=True)
Article.objects.all().delete()
with self.assertRaisesMessage(DatabaseError, 'Forced update did not affect any rows.'):
with self.assertNumQueries(1):
asos.save(force_update=True)
def test_select_on_save_lying_update(self):
"""
select_on_save works correctly if the database doesn't return correct
information about matched rows from UPDATE.
"""
# Change the manager to not return "row matched" for update().
# We are going to change the Article's _base_manager class
# dynamically. This is a bit of a hack, but it seems hard to
# test this properly otherwise. Article's manager, because
# proxy models use their parent model's _base_manager.
orig_class = Article._base_manager._queryset_class
class FakeQuerySet(models.QuerySet):
# Make sure the _update method below is in fact called.
called = False
def _update(self, *args, **kwargs):
FakeQuerySet.called = True
super()._update(*args, **kwargs)
return 0
try:
Article._base_manager._queryset_class = FakeQuerySet
asos = ArticleSelectOnSave.objects.create(pub_date=datetime.now())
with self.assertNumQueries(3):
asos.save()
self.assertTrue(FakeQuerySet.called)
# This is not wanted behavior, but this is how Django has always
# behaved for databases that do not return correct information
# about matched rows for UPDATE.
with self.assertRaisesMessage(DatabaseError, 'Forced update did not affect any rows.'):
asos.save(force_update=True)
msg = (
"An error occurred in the current transaction. You can't "
"execute queries until the end of the 'atomic' block."
)
with self.assertRaisesMessage(DatabaseError, msg):
asos.save(update_fields=['pub_date'])
finally:
Article._base_manager._queryset_class = orig_class
class ModelRefreshTests(TestCase):
def test_refresh(self):
a = Article.objects.create(pub_date=datetime.now())
Article.objects.create(pub_date=datetime.now())
Article.objects.filter(pk=a.pk).update(headline='new headline')
with self.assertNumQueries(1):
a.refresh_from_db()
self.assertEqual(a.headline, 'new headline')
orig_pub_date = a.pub_date
new_pub_date = a.pub_date + timedelta(10)
Article.objects.update(headline='new headline 2', pub_date=new_pub_date)
with self.assertNumQueries(1):
a.refresh_from_db(fields=['headline'])
self.assertEqual(a.headline, 'new headline 2')
self.assertEqual(a.pub_date, orig_pub_date)
with self.assertNumQueries(1):
a.refresh_from_db()
self.assertEqual(a.pub_date, new_pub_date)
def test_unknown_kwarg(self):
s = SelfRef.objects.create()
msg = "refresh_from_db() got an unexpected keyword argument 'unknown_kwarg'"
with self.assertRaisesMessage(TypeError, msg):
s.refresh_from_db(unknown_kwarg=10)
def test_lookup_in_fields(self):
s = SelfRef.objects.create()
msg = 'Found "__" in fields argument. Relations and transforms are not allowed in fields.'
with self.assertRaisesMessage(ValueError, msg):
s.refresh_from_db(fields=['foo__bar'])
def test_refresh_fk(self):
s1 = SelfRef.objects.create()
s2 = SelfRef.objects.create()
s3 = SelfRef.objects.create(selfref=s1)
s3_copy = SelfRef.objects.get(pk=s3.pk)
s3_copy.selfref.touched = True
s3.selfref = s2
s3.save()
with self.assertNumQueries(1):
s3_copy.refresh_from_db()
with self.assertNumQueries(1):
# The old related instance was thrown away (the selfref_id has
# changed). It needs to be reloaded on access, so one query
# executed.
self.assertFalse(hasattr(s3_copy.selfref, 'touched'))
self.assertEqual(s3_copy.selfref, s2)
def test_refresh_null_fk(self):
s1 = SelfRef.objects.create()
s2 = SelfRef.objects.create(selfref=s1)
s2.selfref = None
s2.refresh_from_db()
self.assertEqual(s2.selfref, s1)
def test_refresh_unsaved(self):
pub_date = datetime.now()
a = Article.objects.create(pub_date=pub_date)
a2 = Article(id=a.pk)
with self.assertNumQueries(1):
a2.refresh_from_db()
self.assertEqual(a2.pub_date, pub_date)
self.assertEqual(a2._state.db, "default")
def test_refresh_fk_on_delete_set_null(self):
a = Article.objects.create(
headline='Parrot programs in Python',
pub_date=datetime(2005, 7, 28),
)
s1 = SelfRef.objects.create(article=a)
a.delete()
s1.refresh_from_db()
self.assertIsNone(s1.article_id)
self.assertIsNone(s1.article)
def test_refresh_no_fields(self):
a = Article.objects.create(pub_date=datetime.now())
with self.assertNumQueries(0):
a.refresh_from_db(fields=[])
def test_refresh_clears_reverse_related(self):
"""refresh_from_db() clear cached reverse relations."""
article = Article.objects.create(
headline='Parrot programs in Python',
pub_date=datetime(2005, 7, 28),
)
self.assertFalse(hasattr(article, 'featured'))
FeaturedArticle.objects.create(article_id=article.pk)
article.refresh_from_db()
self.assertTrue(hasattr(article, 'featured'))
def test_refresh_clears_one_to_one_field(self):
article = Article.objects.create(
headline='Parrot programs in Python',
pub_date=datetime(2005, 7, 28),
)
featured = FeaturedArticle.objects.create(article_id=article.pk)
self.assertEqual(featured.article.headline, 'Parrot programs in Python')
article.headline = 'Parrot programs in Python 2.0'
article.save()
featured.refresh_from_db()
self.assertEqual(featured.article.headline, 'Parrot programs in Python 2.0')
def test_prefetched_cache_cleared(self):
a = Article.objects.create(pub_date=datetime(2005, 7, 28))
s = SelfRef.objects.create(article=a)
# refresh_from_db() without fields=[...]
a1_prefetched = Article.objects.prefetch_related('selfref_set').first()
self.assertCountEqual(a1_prefetched.selfref_set.all(), [s])
s.article = None
s.save()
# Relation is cleared and prefetch cache is stale.
self.assertCountEqual(a1_prefetched.selfref_set.all(), [s])
a1_prefetched.refresh_from_db()
# Cache was cleared and new results are available.
self.assertCountEqual(a1_prefetched.selfref_set.all(), [])
# refresh_from_db() with fields=[...]
a2_prefetched = Article.objects.prefetch_related('selfref_set').first()
self.assertCountEqual(a2_prefetched.selfref_set.all(), [])
s.article = a
s.save()
# Relation is added and prefetch cache is stale.
self.assertCountEqual(a2_prefetched.selfref_set.all(), [])
a2_prefetched.refresh_from_db(fields=['selfref_set'])
# Cache was cleared and new results are available.
self.assertCountEqual(a2_prefetched.selfref_set.all(), [s])
|
47fc1a6e128a60171ba5cd67f095f8861de90d2392b6c18fab426f4ded619962 | import datetime
from unittest import skipIf, skipUnless
from django.db import connection
from django.db.models import CASCADE, ForeignKey, Index, Q
from django.test import (
TestCase, TransactionTestCase, skipIfDBFeature, skipUnlessDBFeature,
)
from django.test.utils import override_settings
from django.utils import timezone
from .models import (
Article, ArticleTranslation, IndexedArticle2, IndexTogetherSingleList,
)
class SchemaIndexesTests(TestCase):
"""
Test index handling by the db.backends.schema infrastructure.
"""
def test_index_name_hash(self):
"""
Index names should be deterministic.
"""
editor = connection.schema_editor()
index_name = editor._create_index_name(
table_name=Article._meta.db_table,
column_names=("c1",),
suffix="123",
)
self.assertEqual(index_name, "indexes_article_c1_a52bd80b123")
def test_index_name(self):
"""
Index names on the built-in database backends::
* Are truncated as needed.
* Include all the column names.
* Include a deterministic hash.
"""
long_name = 'l%sng' % ('o' * 100)
editor = connection.schema_editor()
index_name = editor._create_index_name(
table_name=Article._meta.db_table,
column_names=('c1', 'c2', long_name),
suffix='ix',
)
expected = {
'mysql': 'indexes_article_c1_c2_looooooooooooooooooo_255179b2ix',
'oracle': 'indexes_a_c1_c2_loo_255179b2ix',
'postgresql': 'indexes_article_c1_c2_loooooooooooooooooo_255179b2ix',
'sqlite': 'indexes_article_c1_c2_l%sng_255179b2ix' % ('o' * 100),
}
if connection.vendor not in expected:
self.skipTest('This test is only supported on the built-in database backends.')
self.assertEqual(index_name, expected[connection.vendor])
def test_index_together(self):
editor = connection.schema_editor()
index_sql = [str(statement) for statement in editor._model_indexes_sql(Article)]
self.assertEqual(len(index_sql), 1)
# Ensure the index name is properly quoted
self.assertIn(
connection.ops.quote_name(
editor._create_index_name(Article._meta.db_table, ['headline', 'pub_date'], suffix='_idx')
),
index_sql[0]
)
def test_index_together_single_list(self):
# Test for using index_together with a single list (#22172)
index_sql = connection.schema_editor()._model_indexes_sql(IndexTogetherSingleList)
self.assertEqual(len(index_sql), 1)
def test_columns_list_sql(self):
index = Index(fields=['headline'], name='whitespace_idx')
editor = connection.schema_editor()
self.assertIn(
'(%s)' % editor.quote_name('headline'),
str(index.create_sql(Article, editor)),
)
def test_descending_columns_list_sql(self):
index = Index(fields=['-headline'], name='whitespace_idx')
editor = connection.schema_editor()
self.assertIn(
'(%s DESC)' % editor.quote_name('headline'),
str(index.create_sql(Article, editor)),
)
@skipIf(connection.vendor == 'postgresql', 'opclasses are PostgreSQL only')
class SchemaIndexesNotPostgreSQLTests(TransactionTestCase):
available_apps = ['indexes']
def test_create_index_ignores_opclasses(self):
index = Index(
name='test_ops_class',
fields=['headline'],
opclasses=['varchar_pattern_ops'],
)
with connection.schema_editor() as editor:
# This would error if opclasses weren't ignored.
editor.add_index(IndexedArticle2, index)
# The `condition` parameter is ignored by databases that don't support partial
# indexes.
@skipIfDBFeature('supports_partial_indexes')
class PartialIndexConditionIgnoredTests(TransactionTestCase):
available_apps = ['indexes']
def test_condition_ignored(self):
index = Index(
name='test_condition_ignored',
fields=['published'],
condition=Q(published=True),
)
with connection.schema_editor() as editor:
# This would error if condition weren't ignored.
editor.add_index(Article, index)
self.assertNotIn(
'WHERE %s' % editor.quote_name('published'),
str(index.create_sql(Article, editor))
)
@skipUnless(connection.vendor == 'postgresql', 'PostgreSQL tests')
class SchemaIndexesPostgreSQLTests(TransactionTestCase):
available_apps = ['indexes']
get_opclass_query = '''
SELECT opcname, c.relname FROM pg_opclass AS oc
JOIN pg_index as i on oc.oid = ANY(i.indclass)
JOIN pg_class as c on c.oid = i.indexrelid
WHERE c.relname = '%s'
'''
def test_text_indexes(self):
"""Test creation of PostgreSQL-specific text indexes (#12234)"""
from .models import IndexedArticle
index_sql = [str(statement) for statement in connection.schema_editor()._model_indexes_sql(IndexedArticle)]
self.assertEqual(len(index_sql), 5)
self.assertIn('("headline" varchar_pattern_ops)', index_sql[1])
self.assertIn('("body" text_pattern_ops)', index_sql[3])
# unique=True and db_index=True should only create the varchar-specific
# index (#19441).
self.assertIn('("slug" varchar_pattern_ops)', index_sql[4])
def test_virtual_relation_indexes(self):
"""Test indexes are not created for related objects"""
index_sql = connection.schema_editor()._model_indexes_sql(Article)
self.assertEqual(len(index_sql), 1)
def test_ops_class(self):
index = Index(
name='test_ops_class',
fields=['headline'],
opclasses=['varchar_pattern_ops'],
)
with connection.schema_editor() as editor:
editor.add_index(IndexedArticle2, index)
with editor.connection.cursor() as cursor:
cursor.execute(self.get_opclass_query % 'test_ops_class')
self.assertEqual(cursor.fetchall(), [('varchar_pattern_ops', 'test_ops_class')])
def test_ops_class_multiple_columns(self):
index = Index(
name='test_ops_class_multiple',
fields=['headline', 'body'],
opclasses=['varchar_pattern_ops', 'text_pattern_ops'],
)
with connection.schema_editor() as editor:
editor.add_index(IndexedArticle2, index)
with editor.connection.cursor() as cursor:
cursor.execute(self.get_opclass_query % 'test_ops_class_multiple')
expected_ops_classes = (
('varchar_pattern_ops', 'test_ops_class_multiple'),
('text_pattern_ops', 'test_ops_class_multiple'),
)
self.assertCountEqual(cursor.fetchall(), expected_ops_classes)
def test_ops_class_partial(self):
index = Index(
name='test_ops_class_partial',
fields=['body'],
opclasses=['text_pattern_ops'],
condition=Q(headline__contains='China'),
)
with connection.schema_editor() as editor:
editor.add_index(IndexedArticle2, index)
with editor.connection.cursor() as cursor:
cursor.execute(self.get_opclass_query % 'test_ops_class_partial')
self.assertCountEqual(cursor.fetchall(), [('text_pattern_ops', 'test_ops_class_partial')])
def test_ops_class_partial_tablespace(self):
indexname = 'test_ops_class_tblspace'
index = Index(
name=indexname,
fields=['body'],
opclasses=['text_pattern_ops'],
condition=Q(headline__contains='China'),
db_tablespace='pg_default',
)
with connection.schema_editor() as editor:
editor.add_index(IndexedArticle2, index)
self.assertIn('TABLESPACE "pg_default" ', str(index.create_sql(IndexedArticle2, editor)))
with editor.connection.cursor() as cursor:
cursor.execute(self.get_opclass_query % indexname)
self.assertCountEqual(cursor.fetchall(), [('text_pattern_ops', indexname)])
def test_ops_class_descending(self):
indexname = 'test_ops_class_ordered'
index = Index(
name=indexname,
fields=['-body'],
opclasses=['text_pattern_ops'],
)
with connection.schema_editor() as editor:
editor.add_index(IndexedArticle2, index)
with editor.connection.cursor() as cursor:
cursor.execute(self.get_opclass_query % indexname)
self.assertCountEqual(cursor.fetchall(), [('text_pattern_ops', indexname)])
def test_ops_class_descending_partial(self):
indexname = 'test_ops_class_ordered_partial'
index = Index(
name=indexname,
fields=['-body'],
opclasses=['text_pattern_ops'],
condition=Q(headline__contains='China'),
)
with connection.schema_editor() as editor:
editor.add_index(IndexedArticle2, index)
with editor.connection.cursor() as cursor:
cursor.execute(self.get_opclass_query % indexname)
self.assertCountEqual(cursor.fetchall(), [('text_pattern_ops', indexname)])
def test_ops_class_columns_lists_sql(self):
index = Index(
fields=['headline'],
name='whitespace_idx',
opclasses=['text_pattern_ops'],
)
with connection.schema_editor() as editor:
self.assertIn(
'(%s text_pattern_ops)' % editor.quote_name('headline'),
str(index.create_sql(Article, editor)),
)
def test_ops_class_descending_columns_list_sql(self):
index = Index(
fields=['-headline'],
name='whitespace_idx',
opclasses=['text_pattern_ops'],
)
with connection.schema_editor() as editor:
self.assertIn(
'(%s text_pattern_ops DESC)' % editor.quote_name('headline'),
str(index.create_sql(Article, editor)),
)
@skipUnless(connection.vendor == 'mysql', 'MySQL tests')
class SchemaIndexesMySQLTests(TransactionTestCase):
available_apps = ['indexes']
def test_no_index_for_foreignkey(self):
"""
MySQL on InnoDB already creates indexes automatically for foreign keys.
(#14180). An index should be created if db_constraint=False (#26171).
"""
storage = connection.introspection.get_storage_engine(
connection.cursor(), ArticleTranslation._meta.db_table
)
if storage != "InnoDB":
self.skip("This test only applies to the InnoDB storage engine")
index_sql = [str(statement) for statement in connection.schema_editor()._model_indexes_sql(ArticleTranslation)]
self.assertEqual(index_sql, [
'CREATE INDEX `indexes_articletranslation_article_no_constraint_id_d6c0806b` '
'ON `indexes_articletranslation` (`article_no_constraint_id`)'
])
# The index also shouldn't be created if the ForeignKey is added after
# the model was created.
field_created = False
try:
with connection.schema_editor() as editor:
new_field = ForeignKey(Article, CASCADE)
new_field.set_attributes_from_name('new_foreign_key')
editor.add_field(ArticleTranslation, new_field)
field_created = True
# No deferred SQL. The FK constraint is included in the
# statement to add the field.
self.assertFalse(editor.deferred_sql)
finally:
if field_created:
with connection.schema_editor() as editor:
editor.remove_field(ArticleTranslation, new_field)
@skipUnlessDBFeature('supports_partial_indexes')
# SQLite doesn't support timezone-aware datetimes when USE_TZ is False.
@override_settings(USE_TZ=True)
class PartialIndexTests(TransactionTestCase):
# Schema editor is used to create the index to test that it works.
available_apps = ['indexes']
def test_partial_index(self):
with connection.schema_editor() as editor:
index = Index(
name='recent_article_idx',
fields=['pub_date'],
condition=Q(
pub_date__gt=datetime.datetime(
year=2015, month=1, day=1,
# PostgreSQL would otherwise complain about the lookup
# being converted to a mutable function (by removing
# the timezone in the cast) which is forbidden.
tzinfo=timezone.get_current_timezone(),
),
)
)
self.assertIn(
'WHERE %s' % editor.quote_name('pub_date'),
str(index.create_sql(Article, schema_editor=editor))
)
editor.add_index(index=index, model=Article)
self.assertIn(index.name, connection.introspection.get_constraints(
cursor=connection.cursor(), table_name=Article._meta.db_table,
))
editor.remove_index(index=index, model=Article)
def test_integer_restriction_partial(self):
with connection.schema_editor() as editor:
index = Index(
name='recent_article_idx',
fields=['id'],
condition=Q(pk__gt=1),
)
self.assertIn(
'WHERE %s' % editor.quote_name('id'),
str(index.create_sql(Article, schema_editor=editor))
)
editor.add_index(index=index, model=Article)
self.assertIn(index.name, connection.introspection.get_constraints(
cursor=connection.cursor(), table_name=Article._meta.db_table,
))
editor.remove_index(index=index, model=Article)
def test_boolean_restriction_partial(self):
with connection.schema_editor() as editor:
index = Index(
name='published_index',
fields=['published'],
condition=Q(published=True),
)
self.assertIn(
'WHERE %s' % editor.quote_name('published'),
str(index.create_sql(Article, schema_editor=editor))
)
editor.add_index(index=index, model=Article)
self.assertIn(index.name, connection.introspection.get_constraints(
cursor=connection.cursor(), table_name=Article._meta.db_table,
))
editor.remove_index(index=index, model=Article)
@skipUnlessDBFeature('supports_functions_in_partial_indexes')
def test_multiple_conditions(self):
with connection.schema_editor() as editor:
index = Index(
name='recent_article_idx',
fields=['pub_date', 'headline'],
condition=(
Q(pub_date__gt=datetime.datetime(
year=2015,
month=1,
day=1,
tzinfo=timezone.get_current_timezone(),
)) & Q(headline__contains='China')
),
)
sql = str(index.create_sql(Article, schema_editor=editor))
where = sql.find('WHERE')
self.assertIn(
'WHERE (%s' % editor.quote_name('pub_date'),
sql
)
# Because each backend has different syntax for the operators,
# check ONLY the occurrence of headline in the SQL.
self.assertGreater(sql.rfind('headline'), where)
editor.add_index(index=index, model=Article)
self.assertIn(index.name, connection.introspection.get_constraints(
cursor=connection.cursor(), table_name=Article._meta.db_table,
))
editor.remove_index(index=index, model=Article)
def test_is_null_condition(self):
with connection.schema_editor() as editor:
index = Index(
name='recent_article_idx',
fields=['pub_date'],
condition=Q(pub_date__isnull=False),
)
self.assertIn(
'WHERE %s IS NOT NULL' % editor.quote_name('pub_date'),
str(index.create_sql(Article, schema_editor=editor))
)
editor.add_index(index=index, model=Article)
self.assertIn(index.name, connection.introspection.get_constraints(
cursor=connection.cursor(), table_name=Article._meta.db_table,
))
editor.remove_index(index=index, model=Article)
|
dd1bc0c22fb89b9506c10d2cffe2364670805e9a871972e18eb7883f4e7a76f0 | import datetime
from copy import deepcopy
from django.core.exceptions import FieldError, MultipleObjectsReturned
from django.db import IntegrityError, models, transaction
from django.test import TestCase
from django.utils.translation import gettext_lazy
from .models import (
Article, Category, Child, ChildNullableParent, City, Country, District,
First, Parent, Record, Relation, Reporter, School, Student, Third,
ToFieldChild,
)
class ManyToOneTests(TestCase):
def setUp(self):
# Create a few Reporters.
self.r = Reporter(first_name='John', last_name='Smith', email='[email protected]')
self.r.save()
self.r2 = Reporter(first_name='Paul', last_name='Jones', email='[email protected]')
self.r2.save()
# Create an Article.
self.a = Article(headline="This is a test", pub_date=datetime.date(2005, 7, 27), reporter=self.r)
self.a.save()
def test_get(self):
# Article objects have access to their related Reporter objects.
r = self.a.reporter
self.assertEqual(r.id, self.r.id)
self.assertEqual((r.first_name, self.r.last_name), ('John', 'Smith'))
def test_create(self):
# You can also instantiate an Article by passing the Reporter's ID
# instead of a Reporter object.
a3 = Article(headline="Third article", pub_date=datetime.date(2005, 7, 27), reporter_id=self.r.id)
a3.save()
self.assertEqual(a3.reporter.id, self.r.id)
# Similarly, the reporter ID can be a string.
a4 = Article(headline="Fourth article", pub_date=datetime.date(2005, 7, 27), reporter_id=str(self.r.id))
a4.save()
self.assertEqual(repr(a4.reporter), "<Reporter: John Smith>")
def test_add(self):
# Create an Article via the Reporter object.
new_article = self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
self.assertEqual(repr(new_article), "<Article: John's second story>")
self.assertEqual(new_article.reporter.id, self.r.id)
# Create a new article, and add it to the article set.
new_article2 = Article(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
msg = "<Article: Paul's story> instance isn't saved. Use bulk=False or save the object first."
with self.assertRaisesMessage(ValueError, msg):
self.r.article_set.add(new_article2)
self.r.article_set.add(new_article2, bulk=False)
self.assertEqual(new_article2.reporter.id, self.r.id)
self.assertQuerysetEqual(
self.r.article_set.all(),
["<Article: John's second story>", "<Article: Paul's story>", "<Article: This is a test>"]
)
# Add the same article to a different article set - check that it moves.
self.r2.article_set.add(new_article2)
self.assertEqual(new_article2.reporter.id, self.r2.id)
self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
# Adding an object of the wrong type raises TypeError.
with transaction.atomic():
with self.assertRaisesMessage(TypeError, "'Article' instance expected, got <Reporter:"):
self.r.article_set.add(self.r2)
self.assertQuerysetEqual(
self.r.article_set.all(),
["<Article: John's second story>", "<Article: This is a test>"]
)
def test_set(self):
new_article = self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
new_article2 = self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
# Assign the article to the reporter.
new_article2.reporter = self.r
new_article2.save()
self.assertEqual(repr(new_article2.reporter), "<Reporter: John Smith>")
self.assertEqual(new_article2.reporter.id, self.r.id)
self.assertQuerysetEqual(self.r.article_set.all(), [
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(self.r2.article_set.all(), [])
# Set the article back again.
self.r2.article_set.set([new_article, new_article2])
self.assertQuerysetEqual(self.r.article_set.all(), ["<Article: This is a test>"])
self.assertQuerysetEqual(
self.r2.article_set.all(),
["<Article: John's second story>", "<Article: Paul's story>"]
)
# Funny case - because the ForeignKey cannot be null,
# existing members of the set must remain.
self.r.article_set.set([new_article])
self.assertQuerysetEqual(
self.r.article_set.all(),
["<Article: John's second story>", "<Article: This is a test>"]
)
self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
def test_reverse_assignment_deprecation(self):
msg = (
"Direct assignment to the reverse side of a related set is "
"prohibited. Use article_set.set() instead."
)
with self.assertRaisesMessage(TypeError, msg):
self.r2.article_set = []
def test_assign(self):
new_article = self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
new_article2 = self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
# Assign the article to the reporter directly using the descriptor.
new_article2.reporter = self.r
new_article2.save()
self.assertEqual(repr(new_article2.reporter), "<Reporter: John Smith>")
self.assertEqual(new_article2.reporter.id, self.r.id)
self.assertQuerysetEqual(self.r.article_set.all(), [
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(self.r2.article_set.all(), [])
# Set the article back again using set() method.
self.r2.article_set.set([new_article, new_article2])
self.assertQuerysetEqual(self.r.article_set.all(), ["<Article: This is a test>"])
self.assertQuerysetEqual(
self.r2.article_set.all(),
["<Article: John's second story>", "<Article: Paul's story>"]
)
# Because the ForeignKey cannot be null, existing members of the set
# must remain.
self.r.article_set.set([new_article])
self.assertQuerysetEqual(
self.r.article_set.all(),
["<Article: John's second story>", "<Article: This is a test>"]
)
self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
# Reporter cannot be null - there should not be a clear or remove method
self.assertFalse(hasattr(self.r2.article_set, 'remove'))
self.assertFalse(hasattr(self.r2.article_set, 'clear'))
def test_assign_fk_id_value(self):
parent = Parent.objects.create(name='jeff')
child1 = Child.objects.create(name='frank', parent=parent)
child2 = Child.objects.create(name='randy', parent=parent)
parent.bestchild = child1
parent.save()
parent.bestchild_id = child2.pk
parent.save()
self.assertEqual(parent.bestchild_id, child2.pk)
self.assertFalse(Parent.bestchild.is_cached(parent))
self.assertEqual(parent.bestchild, child2)
self.assertTrue(Parent.bestchild.is_cached(parent))
# Reassigning the same value doesn't clear cached instance.
parent.bestchild_id = child2.pk
self.assertTrue(Parent.bestchild.is_cached(parent))
def test_assign_fk_id_none(self):
parent = Parent.objects.create(name='jeff')
child = Child.objects.create(name='frank', parent=parent)
parent.bestchild = child
parent.save()
parent.bestchild_id = None
parent.save()
self.assertIsNone(parent.bestchild_id)
self.assertFalse(Parent.bestchild.is_cached(parent))
self.assertIsNone(parent.bestchild)
self.assertTrue(Parent.bestchild.is_cached(parent))
def test_selects(self):
self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
# Reporter objects have access to their related Article objects.
self.assertQuerysetEqual(self.r.article_set.all(), [
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(self.r.article_set.filter(headline__startswith='This'), ["<Article: This is a test>"])
self.assertEqual(self.r.article_set.count(), 2)
self.assertEqual(self.r2.article_set.count(), 1)
# Get articles by id
self.assertQuerysetEqual(Article.objects.filter(id__exact=self.a.id), ["<Article: This is a test>"])
self.assertQuerysetEqual(Article.objects.filter(pk=self.a.id), ["<Article: This is a test>"])
# Query on an article property
self.assertQuerysetEqual(Article.objects.filter(headline__startswith='This'), ["<Article: This is a test>"])
# The API automatically follows relationships as far as you need.
# Use double underscores to separate relationships.
# This works as many levels deep as you want. There's no limit.
# Find all Articles for any Reporter whose first name is "John".
self.assertQuerysetEqual(
Article.objects.filter(reporter__first_name__exact='John'),
["<Article: John's second story>", "<Article: This is a test>"]
)
# Implied __exact also works
self.assertQuerysetEqual(
Article.objects.filter(reporter__first_name='John'),
["<Article: John's second story>", "<Article: This is a test>"]
)
# Query twice over the related field.
self.assertQuerysetEqual(
Article.objects.filter(reporter__first_name__exact='John', reporter__last_name__exact='Smith'),
["<Article: John's second story>", "<Article: This is a test>"]
)
# The underlying query only makes one join when a related table is referenced twice.
queryset = Article.objects.filter(reporter__first_name__exact='John', reporter__last_name__exact='Smith')
self.assertNumQueries(1, list, queryset)
self.assertEqual(queryset.query.get_compiler(queryset.db).as_sql()[0].count('INNER JOIN'), 1)
# The automatically joined table has a predictable name.
self.assertQuerysetEqual(
Article.objects.filter(reporter__first_name__exact='John').extra(
where=["many_to_one_reporter.last_name='Smith'"]),
["<Article: John's second story>", "<Article: This is a test>"]
)
# ... and should work fine with the string that comes out of forms.Form.cleaned_data
self.assertQuerysetEqual(
(Article.objects
.filter(reporter__first_name__exact='John')
.extra(where=["many_to_one_reporter.last_name='%s'" % 'Smith'])),
["<Article: John's second story>", "<Article: This is a test>"]
)
# Find all Articles for a Reporter.
# Use direct ID check, pk check, and object comparison
self.assertQuerysetEqual(
Article.objects.filter(reporter__id__exact=self.r.id),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter__pk=self.r.id),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter=self.r.id),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter=self.r),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter__in=[self.r.id, self.r2.id]).distinct(),
[
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter__in=[self.r, self.r2]).distinct(),
[
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
# You can also use a queryset instead of a literal list of instances.
# The queryset must be reduced to a list of values using values(),
# then converted into a query
self.assertQuerysetEqual(
Article.objects.filter(
reporter__in=Reporter.objects.filter(first_name='John').values('pk').query
).distinct(),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
def test_reverse_selects(self):
a3 = Article.objects.create(
headline="Third article",
pub_date=datetime.date(2005, 7, 27),
reporter_id=self.r.id,
)
Article.objects.create(
headline="Fourth article",
pub_date=datetime.date(2005, 7, 27),
reporter_id=self.r.id,
)
john_smith = ["<Reporter: John Smith>"]
# Reporters can be queried
self.assertQuerysetEqual(Reporter.objects.filter(id__exact=self.r.id), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(pk=self.r.id), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(first_name__startswith='John'), john_smith)
# Reporters can query in opposite direction of ForeignKey definition
self.assertQuerysetEqual(Reporter.objects.filter(article__id__exact=self.a.id), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(article__pk=self.a.id), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(article=self.a.id), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(article=self.a), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(article__in=[self.a.id, a3.id]).distinct(), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(article__in=[self.a.id, a3]).distinct(), john_smith)
self.assertQuerysetEqual(Reporter.objects.filter(article__in=[self.a, a3]).distinct(), john_smith)
self.assertQuerysetEqual(
Reporter.objects.filter(article__headline__startswith='T'),
["<Reporter: John Smith>", "<Reporter: John Smith>"],
ordered=False
)
self.assertQuerysetEqual(Reporter.objects.filter(article__headline__startswith='T').distinct(), john_smith)
# Counting in the opposite direction works in conjunction with distinct()
self.assertEqual(Reporter.objects.filter(article__headline__startswith='T').count(), 2)
self.assertEqual(Reporter.objects.filter(article__headline__startswith='T').distinct().count(), 1)
# Queries can go round in circles.
self.assertQuerysetEqual(
Reporter.objects.filter(article__reporter__first_name__startswith='John'),
[
"<Reporter: John Smith>",
"<Reporter: John Smith>",
"<Reporter: John Smith>",
],
ordered=False
)
self.assertQuerysetEqual(
Reporter.objects.filter(article__reporter__first_name__startswith='John').distinct(),
john_smith
)
self.assertQuerysetEqual(Reporter.objects.filter(article__reporter__exact=self.r).distinct(), john_smith)
# Implied __exact also works.
self.assertQuerysetEqual(Reporter.objects.filter(article__reporter=self.r).distinct(), john_smith)
# It's possible to use values() calls across many-to-one relations.
# (Note, too, that we clear the ordering here so as not to drag the
# 'headline' field into the columns being used to determine uniqueness)
d = {'reporter__first_name': 'John', 'reporter__last_name': 'Smith'}
qs = Article.objects.filter(
reporter=self.r,
).distinct().order_by().values('reporter__first_name', 'reporter__last_name')
self.assertEqual([d], list(qs))
def test_select_related(self):
# Article.objects.select_related().dates() works properly when there
# are multiple Articles with the same date but different foreign-key
# objects (Reporters).
r1 = Reporter.objects.create(first_name='Mike', last_name='Royko', email='[email protected]')
r2 = Reporter.objects.create(first_name='John', last_name='Kass', email='[email protected]')
Article.objects.create(headline='First', pub_date=datetime.date(1980, 4, 23), reporter=r1)
Article.objects.create(headline='Second', pub_date=datetime.date(1980, 4, 23), reporter=r2)
self.assertEqual(
list(Article.objects.select_related().dates('pub_date', 'day')),
[datetime.date(1980, 4, 23), datetime.date(2005, 7, 27)]
)
self.assertEqual(
list(Article.objects.select_related().dates('pub_date', 'month')),
[datetime.date(1980, 4, 1), datetime.date(2005, 7, 1)]
)
self.assertEqual(
list(Article.objects.select_related().dates('pub_date', 'year')),
[datetime.date(1980, 1, 1), datetime.date(2005, 1, 1)]
)
def test_delete(self):
self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
Article.objects.create(headline="Third article", pub_date=datetime.date(2005, 7, 27), reporter_id=self.r.id)
Article.objects.create(
headline="Fourth article",
pub_date=datetime.date(2005, 7, 27),
reporter_id=str(self.r.id),
)
# If you delete a reporter, his articles will be deleted.
self.assertQuerysetEqual(
Article.objects.all(),
[
"<Article: Fourth article>",
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: Third article>",
"<Article: This is a test>",
]
)
self.assertQuerysetEqual(
Reporter.objects.order_by('first_name'),
["<Reporter: John Smith>", "<Reporter: Paul Jones>"]
)
self.r2.delete()
self.assertQuerysetEqual(
Article.objects.all(),
[
"<Article: Fourth article>",
"<Article: John's second story>",
"<Article: Third article>",
"<Article: This is a test>",
]
)
self.assertQuerysetEqual(Reporter.objects.order_by('first_name'), ["<Reporter: John Smith>"])
# You can delete using a JOIN in the query.
Reporter.objects.filter(article__headline__startswith='This').delete()
self.assertQuerysetEqual(Reporter.objects.all(), [])
self.assertQuerysetEqual(Article.objects.all(), [])
def test_explicit_fk(self):
# Create a new Article with get_or_create using an explicit value
# for a ForeignKey.
a2, created = Article.objects.get_or_create(
headline="John's second test",
pub_date=datetime.date(2011, 5, 7),
reporter_id=self.r.id,
)
self.assertTrue(created)
self.assertEqual(a2.reporter.id, self.r.id)
# You can specify filters containing the explicit FK value.
self.assertQuerysetEqual(
Article.objects.filter(reporter_id__exact=self.r.id),
["<Article: John's second test>", "<Article: This is a test>"]
)
# Create an Article by Paul for the same date.
a3 = Article.objects.create(
headline="Paul's commentary",
pub_date=datetime.date(2011, 5, 7),
reporter_id=self.r2.id,
)
self.assertEqual(a3.reporter.id, self.r2.id)
# Get should respect explicit foreign keys as well.
msg = 'get() returned more than one Article -- it returned 2!'
with self.assertRaisesMessage(MultipleObjectsReturned, msg):
Article.objects.get(reporter_id=self.r.id)
self.assertEqual(
repr(a3),
repr(Article.objects.get(reporter_id=self.r2.id, pub_date=datetime.date(2011, 5, 7)))
)
def test_deepcopy_and_circular_references(self):
# Regression for #12876 -- Model methods that include queries that
# recursive don't cause recursion depth problems under deepcopy.
self.r.cached_query = Article.objects.filter(reporter=self.r)
self.assertEqual(repr(deepcopy(self.r)), "<Reporter: John Smith>")
def test_manager_class_caching(self):
r1 = Reporter.objects.create(first_name='Mike')
r2 = Reporter.objects.create(first_name='John')
# Same twice
self.assertIs(r1.article_set.__class__, r1.article_set.__class__)
# Same as each other
self.assertIs(r1.article_set.__class__, r2.article_set.__class__)
def test_create_relation_with_gettext_lazy(self):
reporter = Reporter.objects.create(first_name='John', last_name='Smith', email='[email protected]')
lazy = gettext_lazy('test')
reporter.article_set.create(headline=lazy, pub_date=datetime.date(2011, 6, 10))
notlazy = str(lazy)
article = reporter.article_set.get()
self.assertEqual(article.headline, notlazy)
def test_values_list_exception(self):
expected_message = "Cannot resolve keyword 'notafield' into field. Choices are: %s"
reporter_fields = ', '.join(sorted(f.name for f in Reporter._meta.get_fields()))
with self.assertRaisesMessage(FieldError, expected_message % reporter_fields):
Article.objects.values_list('reporter__notafield')
article_fields = ', '.join(['EXTRA'] + sorted(f.name for f in Article._meta.get_fields()))
with self.assertRaisesMessage(FieldError, expected_message % article_fields):
Article.objects.extra(select={'EXTRA': 'EXTRA_SELECT'}).values_list('notafield')
def test_fk_assignment_and_related_object_cache(self):
# Tests of ForeignKey assignment and the related-object cache (see #6886).
p = Parent.objects.create(name="Parent")
c = Child.objects.create(name="Child", parent=p)
# Look up the object again so that we get a "fresh" object.
c = Child.objects.get(name="Child")
p = c.parent
# Accessing the related object again returns the exactly same object.
self.assertIs(c.parent, p)
# But if we kill the cache, we get a new object.
del c._state.fields_cache['parent']
self.assertIsNot(c.parent, p)
# Assigning a new object results in that object getting cached immediately.
p2 = Parent.objects.create(name="Parent 2")
c.parent = p2
self.assertIs(c.parent, p2)
# Assigning None succeeds if field is null=True.
p.bestchild = None
self.assertIsNone(p.bestchild)
# bestchild should still be None after saving.
p.save()
self.assertIsNone(p.bestchild)
# bestchild should still be None after fetching the object again.
p = Parent.objects.get(name="Parent")
self.assertIsNone(p.bestchild)
# Assigning None will not fail: Child.parent is null=False.
setattr(c, "parent", None)
# You also can't assign an object of the wrong type here
msg = (
'Cannot assign "<First: First object (1)>": "Child.parent" must '
'be a "Parent" instance.'
)
with self.assertRaisesMessage(ValueError, msg):
setattr(c, "parent", First(id=1, second=1))
# You can assign None to Child.parent during object creation.
Child(name='xyzzy', parent=None)
# But when trying to save a Child with parent=None, the database will
# raise IntegrityError.
with self.assertRaises(IntegrityError), transaction.atomic():
Child.objects.create(name='xyzzy', parent=None)
# Creation using keyword argument should cache the related object.
p = Parent.objects.get(name="Parent")
c = Child(parent=p)
self.assertIs(c.parent, p)
# Creation using keyword argument and unsaved related instance (#8070).
p = Parent()
msg = "save() prohibited to prevent data loss due to unsaved related object 'parent'."
with self.assertRaisesMessage(ValueError, msg):
Child.objects.create(parent=p)
msg = "save() prohibited to prevent data loss due to unsaved related object 'parent'."
with self.assertRaisesMessage(ValueError, msg):
ToFieldChild.objects.create(parent=p)
# Creation using attname keyword argument and an id will cause the
# related object to be fetched.
p = Parent.objects.get(name="Parent")
c = Child(parent_id=p.id)
self.assertIsNot(c.parent, p)
self.assertEqual(c.parent, p)
def test_save_nullable_fk_after_parent(self):
parent = Parent()
child = ChildNullableParent(parent=parent)
parent.save()
child.save()
child.refresh_from_db()
self.assertEqual(child.parent, parent)
def test_save_nullable_fk_after_parent_with_to_field(self):
parent = Parent(name='jeff')
child = ToFieldChild(parent=parent)
parent.save()
child.save()
child.refresh_from_db()
self.assertEqual(child.parent, parent)
self.assertEqual(child.parent_id, parent.name)
def test_fk_to_bigautofield(self):
ch = City.objects.create(name='Chicago')
District.objects.create(city=ch, name='Far South')
District.objects.create(city=ch, name='North')
ny = City.objects.create(name='New York', id=2 ** 33)
District.objects.create(city=ny, name='Brooklyn')
District.objects.create(city=ny, name='Manhattan')
def test_fk_to_smallautofield(self):
us = Country.objects.create(name='United States')
City.objects.create(country=us, name='Chicago')
City.objects.create(country=us, name='New York')
uk = Country.objects.create(name='United Kingdom', id=2 ** 11)
City.objects.create(country=uk, name='London')
City.objects.create(country=uk, name='Edinburgh')
def test_multiple_foreignkeys(self):
# Test of multiple ForeignKeys to the same model (bug #7125).
c1 = Category.objects.create(name='First')
c2 = Category.objects.create(name='Second')
c3 = Category.objects.create(name='Third')
r1 = Record.objects.create(category=c1)
r2 = Record.objects.create(category=c1)
r3 = Record.objects.create(category=c2)
r4 = Record.objects.create(category=c2)
r5 = Record.objects.create(category=c3)
Relation.objects.create(left=r1, right=r2)
Relation.objects.create(left=r3, right=r4)
Relation.objects.create(left=r1, right=r3)
Relation.objects.create(left=r5, right=r2)
Relation.objects.create(left=r3, right=r2)
q1 = Relation.objects.filter(left__category__name__in=['First'], right__category__name__in=['Second'])
self.assertQuerysetEqual(q1, ["<Relation: First - Second>"])
q2 = Category.objects.filter(record__left_set__right__category__name='Second').order_by('name')
self.assertQuerysetEqual(q2, ["<Category: First>", "<Category: Second>"])
p = Parent.objects.create(name="Parent")
c = Child.objects.create(name="Child", parent=p)
msg = 'Cannot assign "%r": "Child.parent" must be a "Parent" instance.' % c
with self.assertRaisesMessage(ValueError, msg):
Child.objects.create(name="Grandchild", parent=c)
def test_fk_instantiation_outside_model(self):
# Regression for #12190 -- Should be able to instantiate a FK outside
# of a model, and interrogate its related field.
cat = models.ForeignKey(Category, models.CASCADE)
self.assertEqual('id', cat.remote_field.get_related_field().name)
def test_relation_unsaved(self):
# The <field>_set manager does not join on Null value fields (#17541)
Third.objects.create(name='Third 1')
Third.objects.create(name='Third 2')
th = Third(name="testing")
# The object isn't saved and thus the relation field is null - we won't even
# execute a query in this case.
with self.assertNumQueries(0):
self.assertEqual(th.child_set.count(), 0)
th.save()
# Now the model is saved, so we will need to execute a query.
with self.assertNumQueries(1):
self.assertEqual(th.child_set.count(), 0)
def test_related_object(self):
public_school = School.objects.create(is_public=True)
public_student = Student.objects.create(school=public_school)
private_school = School.objects.create(is_public=False)
private_student = Student.objects.create(school=private_school)
# Only one school is available via all() due to the custom default manager.
self.assertSequenceEqual(School.objects.all(), [public_school])
self.assertEqual(public_student.school, public_school)
# Make sure the base manager is used so that a student can still access
# its related school even if the default manager doesn't normally
# allow it.
self.assertEqual(private_student.school, private_school)
School._meta.base_manager_name = 'objects'
School._meta._expire_cache()
try:
private_student = Student.objects.get(pk=private_student.pk)
with self.assertRaises(School.DoesNotExist):
private_student.school
finally:
School._meta.base_manager_name = None
School._meta._expire_cache()
def test_hasattr_related_object(self):
# The exception raised on attribute access when a related object
# doesn't exist should be an instance of a subclass of `AttributeError`
# refs #21563
self.assertFalse(hasattr(Article(), 'reporter'))
def test_clear_after_prefetch(self):
c = City.objects.create(name='Musical City')
District.objects.create(name='Ladida', city=c)
city = City.objects.prefetch_related('districts').get(id=c.id)
self.assertQuerysetEqual(city.districts.all(), ['<District: Ladida>'])
city.districts.clear()
self.assertQuerysetEqual(city.districts.all(), [])
def test_remove_after_prefetch(self):
c = City.objects.create(name='Musical City')
d = District.objects.create(name='Ladida', city=c)
city = City.objects.prefetch_related('districts').get(id=c.id)
self.assertQuerysetEqual(city.districts.all(), ['<District: Ladida>'])
city.districts.remove(d)
self.assertQuerysetEqual(city.districts.all(), [])
def test_add_after_prefetch(self):
c = City.objects.create(name='Musical City')
District.objects.create(name='Ladida', city=c)
d2 = District.objects.create(name='Ladidu')
city = City.objects.prefetch_related('districts').get(id=c.id)
self.assertEqual(city.districts.count(), 1)
city.districts.add(d2)
self.assertEqual(city.districts.count(), 2)
def test_set_after_prefetch(self):
c = City.objects.create(name='Musical City')
District.objects.create(name='Ladida', city=c)
d2 = District.objects.create(name='Ladidu')
city = City.objects.prefetch_related('districts').get(id=c.id)
self.assertEqual(city.districts.count(), 1)
city.districts.set([d2])
self.assertQuerysetEqual(city.districts.all(), ['<District: Ladidu>'])
def test_add_then_remove_after_prefetch(self):
c = City.objects.create(name='Musical City')
District.objects.create(name='Ladida', city=c)
d2 = District.objects.create(name='Ladidu')
city = City.objects.prefetch_related('districts').get(id=c.id)
self.assertEqual(city.districts.count(), 1)
city.districts.add(d2)
self.assertEqual(city.districts.count(), 2)
city.districts.remove(d2)
self.assertEqual(city.districts.count(), 1)
def test_cached_relation_invalidated_on_save(self):
"""
Model.save() invalidates stale ForeignKey relations after a primary key
assignment.
"""
self.assertEqual(self.a.reporter, self.r) # caches a.reporter
self.a.reporter_id = self.r2.pk
self.a.save()
self.assertEqual(self.a.reporter, self.r2)
def test_cached_foreign_key_with_to_field_not_cleared_by_save(self):
parent = Parent.objects.create(name='a')
child = ToFieldChild.objects.create(parent=parent)
with self.assertNumQueries(0):
self.assertIs(child.parent, parent)
def test_reverse_foreign_key_instance_to_field_caching(self):
parent = Parent.objects.create(name='a')
ToFieldChild.objects.create(parent=parent)
child = parent.to_field_children.get()
with self.assertNumQueries(0):
self.assertIs(child.parent, parent)
|
2289fd3c62c370cf14fd46f8f1d35a1c837561ea7c958511171a845bfbfb34c6 | """Tests related to django.db.backends that haven't been organized."""
import datetime
import threading
import unittest
import warnings
from django.core.management.color import no_style
from django.db import (
DEFAULT_DB_ALIAS, DatabaseError, IntegrityError, connection, connections,
reset_queries, transaction,
)
from django.db.backends.base.base import BaseDatabaseWrapper
from django.db.backends.signals import connection_created
from django.db.backends.utils import CursorWrapper
from django.db.models.sql.constants import CURSOR
from django.test import (
TestCase, TransactionTestCase, override_settings, skipIfDBFeature,
skipUnlessDBFeature,
)
from .models import (
Article, Object, ObjectReference, Person, Post, RawData, Reporter,
ReporterProxy, SchoolClass, Square,
VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ,
)
class DateQuotingTest(TestCase):
def test_django_date_trunc(self):
"""
Test the custom ``django_date_trunc method``, in particular against
fields which clash with strings passed to it (e.g. 'year') (#12818).
"""
updated = datetime.datetime(2010, 2, 20)
SchoolClass.objects.create(year=2009, last_updated=updated)
years = SchoolClass.objects.dates('last_updated', 'year')
self.assertEqual(list(years), [datetime.date(2010, 1, 1)])
def test_django_date_extract(self):
"""
Test the custom ``django_date_extract method``, in particular against fields
which clash with strings passed to it (e.g. 'day') (#12818).
"""
updated = datetime.datetime(2010, 2, 20)
SchoolClass.objects.create(year=2009, last_updated=updated)
classes = SchoolClass.objects.filter(last_updated__day=20)
self.assertEqual(len(classes), 1)
@override_settings(DEBUG=True)
class LastExecutedQueryTest(TestCase):
def test_last_executed_query_without_previous_query(self):
"""
last_executed_query should not raise an exception even if no previous
query has been run.
"""
with connection.cursor() as cursor:
connection.ops.last_executed_query(cursor, '', ())
def test_debug_sql(self):
list(Reporter.objects.filter(first_name="test"))
sql = connection.queries[-1]['sql'].lower()
self.assertIn("select", sql)
self.assertIn(Reporter._meta.db_table, sql)
def test_query_encoding(self):
"""last_executed_query() returns a string."""
data = RawData.objects.filter(raw_data=b'\x00\x46 \xFE').extra(select={'föö': 1})
sql, params = data.query.sql_with_params()
cursor = data.query.get_compiler('default').execute_sql(CURSOR)
last_sql = cursor.db.ops.last_executed_query(cursor, sql, params)
self.assertIsInstance(last_sql, str)
def test_last_executed_query(self):
# last_executed_query() interpolate all parameters, in most cases it is
# not equal to QuerySet.query.
for qs in (
Article.objects.filter(pk=1),
Article.objects.filter(pk__in=(1, 2), reporter__pk=3),
):
sql, params = qs.query.sql_with_params()
cursor = qs.query.get_compiler(DEFAULT_DB_ALIAS).execute_sql(CURSOR)
self.assertEqual(
cursor.db.ops.last_executed_query(cursor, sql, params),
str(qs.query),
)
@skipUnlessDBFeature('supports_paramstyle_pyformat')
def test_last_executed_query_dict(self):
square_opts = Square._meta
sql = 'INSERT INTO %s (%s, %s) VALUES (%%(root)s, %%(square)s)' % (
connection.introspection.identifier_converter(square_opts.db_table),
connection.ops.quote_name(square_opts.get_field('root').column),
connection.ops.quote_name(square_opts.get_field('square').column),
)
with connection.cursor() as cursor:
params = {'root': 2, 'square': 4}
cursor.execute(sql, params)
self.assertEqual(
cursor.db.ops.last_executed_query(cursor, sql, params),
sql % params,
)
class ParameterHandlingTest(TestCase):
def test_bad_parameter_count(self):
"An executemany call with too many/not enough parameters will raise an exception (Refs #12612)"
with connection.cursor() as cursor:
query = ('INSERT INTO %s (%s, %s) VALUES (%%s, %%s)' % (
connection.introspection.identifier_converter('backends_square'),
connection.ops.quote_name('root'),
connection.ops.quote_name('square')
))
with self.assertRaises(Exception):
cursor.executemany(query, [(1, 2, 3)])
with self.assertRaises(Exception):
cursor.executemany(query, [(1,)])
class LongNameTest(TransactionTestCase):
"""Long primary keys and model names can result in a sequence name
that exceeds the database limits, which will result in truncation
on certain databases (e.g., Postgres). The backend needs to use
the correct sequence name in last_insert_id and other places, so
check it is. Refs #8901.
"""
available_apps = ['backends']
def test_sequence_name_length_limits_create(self):
"""Test creation of model with long name and long pk name doesn't error. Ref #8901"""
VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
def test_sequence_name_length_limits_m2m(self):
"""
An m2m save of a model with a long name and a long m2m field name
doesn't error (#8901).
"""
obj = VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
rel_obj = Person.objects.create(first_name='Django', last_name='Reinhardt')
obj.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.add(rel_obj)
def test_sequence_name_length_limits_flush(self):
"""
Sequence resetting as part of a flush with model with long name and
long pk name doesn't error (#8901).
"""
# A full flush is expensive to the full test, so we dig into the
# internals to generate the likely offending SQL and run it manually
# Some convenience aliases
VLM = VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
VLM_m2m = VLM.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.through
tables = [
VLM._meta.db_table,
VLM_m2m._meta.db_table,
]
sequences = [
{
'column': VLM._meta.pk.column,
'table': VLM._meta.db_table
},
]
sql_list = connection.ops.sql_flush(no_style(), tables, sequences)
with connection.cursor() as cursor:
for statement in sql_list:
cursor.execute(statement)
class SequenceResetTest(TestCase):
def test_generic_relation(self):
"Sequence names are correct when resetting generic relations (Ref #13941)"
# Create an object with a manually specified PK
Post.objects.create(id=10, name='1st post', text='hello world')
# Reset the sequences for the database
commands = connections[DEFAULT_DB_ALIAS].ops.sequence_reset_sql(no_style(), [Post])
with connection.cursor() as cursor:
for sql in commands:
cursor.execute(sql)
# If we create a new object now, it should have a PK greater
# than the PK we specified manually.
obj = Post.objects.create(name='New post', text='goodbye world')
self.assertGreater(obj.pk, 10)
# This test needs to run outside of a transaction, otherwise closing the
# connection would implicitly rollback and cause problems during teardown.
class ConnectionCreatedSignalTest(TransactionTestCase):
available_apps = []
# Unfortunately with sqlite3 the in-memory test database cannot be closed,
# and so it cannot be re-opened during testing.
@skipUnlessDBFeature('test_db_allows_multiple_connections')
def test_signal(self):
data = {}
def receiver(sender, connection, **kwargs):
data["connection"] = connection
connection_created.connect(receiver)
connection.close()
connection.cursor()
self.assertIs(data["connection"].connection, connection.connection)
connection_created.disconnect(receiver)
data.clear()
connection.cursor()
self.assertEqual(data, {})
class EscapingChecks(TestCase):
"""
All tests in this test case are also run with settings.DEBUG=True in
EscapingChecksDebug test case, to also test CursorDebugWrapper.
"""
bare_select_suffix = connection.features.bare_select_suffix
def test_paramless_no_escaping(self):
with connection.cursor() as cursor:
cursor.execute("SELECT '%s'" + self.bare_select_suffix)
self.assertEqual(cursor.fetchall()[0][0], '%s')
def test_parameter_escaping(self):
with connection.cursor() as cursor:
cursor.execute("SELECT '%%', %s" + self.bare_select_suffix, ('%d',))
self.assertEqual(cursor.fetchall()[0], ('%', '%d'))
@override_settings(DEBUG=True)
class EscapingChecksDebug(EscapingChecks):
pass
class BackendTestCase(TransactionTestCase):
available_apps = ['backends']
def create_squares_with_executemany(self, args):
self.create_squares(args, 'format', True)
def create_squares(self, args, paramstyle, multiple):
opts = Square._meta
tbl = connection.introspection.identifier_converter(opts.db_table)
f1 = connection.ops.quote_name(opts.get_field('root').column)
f2 = connection.ops.quote_name(opts.get_field('square').column)
if paramstyle == 'format':
query = 'INSERT INTO %s (%s, %s) VALUES (%%s, %%s)' % (tbl, f1, f2)
elif paramstyle == 'pyformat':
query = 'INSERT INTO %s (%s, %s) VALUES (%%(root)s, %%(square)s)' % (tbl, f1, f2)
else:
raise ValueError("unsupported paramstyle in test")
with connection.cursor() as cursor:
if multiple:
cursor.executemany(query, args)
else:
cursor.execute(query, args)
def test_cursor_executemany(self):
# Test cursor.executemany #4896
args = [(i, i ** 2) for i in range(-5, 6)]
self.create_squares_with_executemany(args)
self.assertEqual(Square.objects.count(), 11)
for i in range(-5, 6):
square = Square.objects.get(root=i)
self.assertEqual(square.square, i ** 2)
def test_cursor_executemany_with_empty_params_list(self):
# Test executemany with params=[] does nothing #4765
args = []
self.create_squares_with_executemany(args)
self.assertEqual(Square.objects.count(), 0)
def test_cursor_executemany_with_iterator(self):
# Test executemany accepts iterators #10320
args = ((i, i ** 2) for i in range(-3, 2))
self.create_squares_with_executemany(args)
self.assertEqual(Square.objects.count(), 5)
args = ((i, i ** 2) for i in range(3, 7))
with override_settings(DEBUG=True):
# same test for DebugCursorWrapper
self.create_squares_with_executemany(args)
self.assertEqual(Square.objects.count(), 9)
@skipUnlessDBFeature('supports_paramstyle_pyformat')
def test_cursor_execute_with_pyformat(self):
# Support pyformat style passing of parameters #10070
args = {'root': 3, 'square': 9}
self.create_squares(args, 'pyformat', multiple=False)
self.assertEqual(Square.objects.count(), 1)
@skipUnlessDBFeature('supports_paramstyle_pyformat')
def test_cursor_executemany_with_pyformat(self):
# Support pyformat style passing of parameters #10070
args = [{'root': i, 'square': i ** 2} for i in range(-5, 6)]
self.create_squares(args, 'pyformat', multiple=True)
self.assertEqual(Square.objects.count(), 11)
for i in range(-5, 6):
square = Square.objects.get(root=i)
self.assertEqual(square.square, i ** 2)
@skipUnlessDBFeature('supports_paramstyle_pyformat')
def test_cursor_executemany_with_pyformat_iterator(self):
args = ({'root': i, 'square': i ** 2} for i in range(-3, 2))
self.create_squares(args, 'pyformat', multiple=True)
self.assertEqual(Square.objects.count(), 5)
args = ({'root': i, 'square': i ** 2} for i in range(3, 7))
with override_settings(DEBUG=True):
# same test for DebugCursorWrapper
self.create_squares(args, 'pyformat', multiple=True)
self.assertEqual(Square.objects.count(), 9)
def test_unicode_fetches(self):
# fetchone, fetchmany, fetchall return strings as unicode objects #6254
qn = connection.ops.quote_name
Person(first_name="John", last_name="Doe").save()
Person(first_name="Jane", last_name="Doe").save()
Person(first_name="Mary", last_name="Agnelline").save()
Person(first_name="Peter", last_name="Parker").save()
Person(first_name="Clark", last_name="Kent").save()
opts2 = Person._meta
f3, f4 = opts2.get_field('first_name'), opts2.get_field('last_name')
with connection.cursor() as cursor:
cursor.execute(
'SELECT %s, %s FROM %s ORDER BY %s' % (
qn(f3.column),
qn(f4.column),
connection.introspection.identifier_converter(opts2.db_table),
qn(f3.column),
)
)
self.assertEqual(cursor.fetchone(), ('Clark', 'Kent'))
self.assertEqual(list(cursor.fetchmany(2)), [('Jane', 'Doe'), ('John', 'Doe')])
self.assertEqual(list(cursor.fetchall()), [('Mary', 'Agnelline'), ('Peter', 'Parker')])
def test_unicode_password(self):
old_password = connection.settings_dict['PASSWORD']
connection.settings_dict['PASSWORD'] = "françois"
try:
connection.cursor()
except DatabaseError:
# As password is probably wrong, a database exception is expected
pass
except Exception as e:
self.fail("Unexpected error raised with unicode password: %s" % e)
finally:
connection.settings_dict['PASSWORD'] = old_password
def test_database_operations_helper_class(self):
# Ticket #13630
self.assertTrue(hasattr(connection, 'ops'))
self.assertTrue(hasattr(connection.ops, 'connection'))
self.assertEqual(connection, connection.ops.connection)
def test_database_operations_init(self):
"""
DatabaseOperations initialization doesn't query the database.
See #17656.
"""
with self.assertNumQueries(0):
connection.ops.__class__(connection)
def test_cached_db_features(self):
self.assertIn(connection.features.supports_transactions, (True, False))
self.assertIn(connection.features.can_introspect_foreign_keys, (True, False))
def test_duplicate_table_error(self):
""" Creating an existing table returns a DatabaseError """
query = 'CREATE TABLE %s (id INTEGER);' % Article._meta.db_table
with connection.cursor() as cursor:
with self.assertRaises(DatabaseError):
cursor.execute(query)
def test_cursor_contextmanager(self):
"""
Cursors can be used as a context manager
"""
with connection.cursor() as cursor:
self.assertIsInstance(cursor, CursorWrapper)
# Both InterfaceError and ProgrammingError seem to be used when
# accessing closed cursor (psycopg2 has InterfaceError, rest seem
# to use ProgrammingError).
with self.assertRaises(connection.features.closed_cursor_error_class):
# cursor should be closed, so no queries should be possible.
cursor.execute("SELECT 1" + connection.features.bare_select_suffix)
@unittest.skipUnless(connection.vendor == 'postgresql',
"Psycopg2 specific cursor.closed attribute needed")
def test_cursor_contextmanager_closing(self):
# There isn't a generic way to test that cursors are closed, but
# psycopg2 offers us a way to check that by closed attribute.
# So, run only on psycopg2 for that reason.
with connection.cursor() as cursor:
self.assertIsInstance(cursor, CursorWrapper)
self.assertTrue(cursor.closed)
# Unfortunately with sqlite3 the in-memory test database cannot be closed.
@skipUnlessDBFeature('test_db_allows_multiple_connections')
def test_is_usable_after_database_disconnects(self):
"""
is_usable() doesn't crash when the database disconnects (#21553).
"""
# Open a connection to the database.
with connection.cursor():
pass
# Emulate a connection close by the database.
connection._close()
# Even then is_usable() should not raise an exception.
try:
self.assertFalse(connection.is_usable())
finally:
# Clean up the mess created by connection._close(). Since the
# connection is already closed, this crashes on some backends.
try:
connection.close()
except Exception:
pass
@override_settings(DEBUG=True)
def test_queries(self):
"""
Test the documented API of connection.queries.
"""
sql = 'SELECT 1' + connection.features.bare_select_suffix
with connection.cursor() as cursor:
reset_queries()
cursor.execute(sql)
self.assertEqual(1, len(connection.queries))
self.assertIsInstance(connection.queries, list)
self.assertIsInstance(connection.queries[0], dict)
self.assertEqual(list(connection.queries[0]), ['sql', 'time'])
self.assertEqual(connection.queries[0]['sql'], sql)
reset_queries()
self.assertEqual(0, len(connection.queries))
sql = ('INSERT INTO %s (%s, %s) VALUES (%%s, %%s)' % (
connection.introspection.identifier_converter('backends_square'),
connection.ops.quote_name('root'),
connection.ops.quote_name('square'),
))
with connection.cursor() as cursor:
cursor.executemany(sql, [(1, 1), (2, 4)])
self.assertEqual(1, len(connection.queries))
self.assertIsInstance(connection.queries, list)
self.assertIsInstance(connection.queries[0], dict)
self.assertEqual(list(connection.queries[0]), ['sql', 'time'])
self.assertEqual(connection.queries[0]['sql'], '2 times: %s' % sql)
# Unfortunately with sqlite3 the in-memory test database cannot be closed.
@skipUnlessDBFeature('test_db_allows_multiple_connections')
@override_settings(DEBUG=True)
def test_queries_limit(self):
"""
The backend doesn't store an unlimited number of queries (#12581).
"""
old_queries_limit = BaseDatabaseWrapper.queries_limit
BaseDatabaseWrapper.queries_limit = 3
new_connection = connection.copy()
# Initialize the connection and clear initialization statements.
with new_connection.cursor():
pass
new_connection.queries_log.clear()
try:
with new_connection.cursor() as cursor:
cursor.execute("SELECT 1" + new_connection.features.bare_select_suffix)
cursor.execute("SELECT 2" + new_connection.features.bare_select_suffix)
with warnings.catch_warnings(record=True) as w:
self.assertEqual(2, len(new_connection.queries))
self.assertEqual(0, len(w))
with new_connection.cursor() as cursor:
cursor.execute("SELECT 3" + new_connection.features.bare_select_suffix)
cursor.execute("SELECT 4" + new_connection.features.bare_select_suffix)
msg = "Limit for query logging exceeded, only the last 3 queries will be returned."
with self.assertWarnsMessage(UserWarning, msg):
self.assertEqual(3, len(new_connection.queries))
finally:
BaseDatabaseWrapper.queries_limit = old_queries_limit
new_connection.close()
def test_timezone_none_use_tz_false(self):
connection.ensure_connection()
with self.settings(TIME_ZONE=None, USE_TZ=False):
connection.init_connection_state()
# These tests aren't conditional because it would require differentiating
# between MySQL+InnoDB and MySQL+MYISAM (something we currently can't do).
class FkConstraintsTests(TransactionTestCase):
available_apps = ['backends']
def setUp(self):
# Create a Reporter.
self.r = Reporter.objects.create(first_name='John', last_name='Smith')
def test_integrity_checks_on_creation(self):
"""
Try to create a model instance that violates a FK constraint. If it
fails it should fail with IntegrityError.
"""
a1 = Article(headline="This is a test", pub_date=datetime.datetime(2005, 7, 27), reporter_id=30)
try:
a1.save()
except IntegrityError:
pass
else:
self.skipTest("This backend does not support integrity checks.")
# Now that we know this backend supports integrity checks we make sure
# constraints are also enforced for proxy Refs #17519
a2 = Article(
headline='This is another test', reporter=self.r,
pub_date=datetime.datetime(2012, 8, 3),
reporter_proxy_id=30,
)
with self.assertRaises(IntegrityError):
a2.save()
def test_integrity_checks_on_update(self):
"""
Try to update a model instance introducing a FK constraint violation.
If it fails it should fail with IntegrityError.
"""
# Create an Article.
Article.objects.create(headline="Test article", pub_date=datetime.datetime(2010, 9, 4), reporter=self.r)
# Retrieve it from the DB
a1 = Article.objects.get(headline="Test article")
a1.reporter_id = 30
try:
a1.save()
except IntegrityError:
pass
else:
self.skipTest("This backend does not support integrity checks.")
# Now that we know this backend supports integrity checks we make sure
# constraints are also enforced for proxy Refs #17519
# Create another article
r_proxy = ReporterProxy.objects.get(pk=self.r.pk)
Article.objects.create(
headline='Another article',
pub_date=datetime.datetime(1988, 5, 15),
reporter=self.r, reporter_proxy=r_proxy,
)
# Retrieve the second article from the DB
a2 = Article.objects.get(headline='Another article')
a2.reporter_proxy_id = 30
with self.assertRaises(IntegrityError):
a2.save()
def test_disable_constraint_checks_manually(self):
"""
When constraint checks are disabled, should be able to write bad data
without IntegrityErrors.
"""
with transaction.atomic():
# Create an Article.
Article.objects.create(
headline="Test article",
pub_date=datetime.datetime(2010, 9, 4),
reporter=self.r,
)
# Retrieve it from the DB
a = Article.objects.get(headline="Test article")
a.reporter_id = 30
try:
connection.disable_constraint_checking()
a.save()
connection.enable_constraint_checking()
except IntegrityError:
self.fail("IntegrityError should not have occurred.")
transaction.set_rollback(True)
def test_disable_constraint_checks_context_manager(self):
"""
When constraint checks are disabled (using context manager), should be
able to write bad data without IntegrityErrors.
"""
with transaction.atomic():
# Create an Article.
Article.objects.create(
headline="Test article",
pub_date=datetime.datetime(2010, 9, 4),
reporter=self.r,
)
# Retrieve it from the DB
a = Article.objects.get(headline="Test article")
a.reporter_id = 30
try:
with connection.constraint_checks_disabled():
a.save()
except IntegrityError:
self.fail("IntegrityError should not have occurred.")
transaction.set_rollback(True)
def test_check_constraints(self):
"""
Constraint checks should raise an IntegrityError when bad data is in the DB.
"""
with transaction.atomic():
# Create an Article.
Article.objects.create(
headline="Test article",
pub_date=datetime.datetime(2010, 9, 4),
reporter=self.r,
)
# Retrieve it from the DB
a = Article.objects.get(headline="Test article")
a.reporter_id = 30
with connection.constraint_checks_disabled():
a.save()
with self.assertRaises(IntegrityError):
connection.check_constraints()
transaction.set_rollback(True)
class ThreadTests(TransactionTestCase):
available_apps = ['backends']
def test_default_connection_thread_local(self):
"""
The default connection (i.e. django.db.connection) is different for
each thread (#17258).
"""
# Map connections by id because connections with identical aliases
# have the same hash.
connections_dict = {}
connection.cursor()
connections_dict[id(connection)] = connection
def runner():
# Passing django.db.connection between threads doesn't work while
# connections[DEFAULT_DB_ALIAS] does.
from django.db import connections
connection = connections[DEFAULT_DB_ALIAS]
# Allow thread sharing so the connection can be closed by the
# main thread.
connection.inc_thread_sharing()
connection.cursor()
connections_dict[id(connection)] = connection
try:
for x in range(2):
t = threading.Thread(target=runner)
t.start()
t.join()
# Each created connection got different inner connection.
self.assertEqual(len({conn.connection for conn in connections_dict.values()}), 3)
finally:
# Finish by closing the connections opened by the other threads
# (the connection opened in the main thread will automatically be
# closed on teardown).
for conn in connections_dict.values():
if conn is not connection:
if conn.allow_thread_sharing:
conn.close()
conn.dec_thread_sharing()
def test_connections_thread_local(self):
"""
The connections are different for each thread (#17258).
"""
# Map connections by id because connections with identical aliases
# have the same hash.
connections_dict = {}
for conn in connections.all():
connections_dict[id(conn)] = conn
def runner():
from django.db import connections
for conn in connections.all():
# Allow thread sharing so the connection can be closed by the
# main thread.
conn.inc_thread_sharing()
connections_dict[id(conn)] = conn
try:
num_new_threads = 2
for x in range(num_new_threads):
t = threading.Thread(target=runner)
t.start()
t.join()
self.assertEqual(
len(connections_dict),
len(connections.all()) * (num_new_threads + 1),
)
finally:
# Finish by closing the connections opened by the other threads
# (the connection opened in the main thread will automatically be
# closed on teardown).
for conn in connections_dict.values():
if conn is not connection:
if conn.allow_thread_sharing:
conn.close()
conn.dec_thread_sharing()
def test_pass_connection_between_threads(self):
"""
A connection can be passed from one thread to the other (#17258).
"""
Person.objects.create(first_name="John", last_name="Doe")
def do_thread():
def runner(main_thread_connection):
from django.db import connections
connections['default'] = main_thread_connection
try:
Person.objects.get(first_name="John", last_name="Doe")
except Exception as e:
exceptions.append(e)
t = threading.Thread(target=runner, args=[connections['default']])
t.start()
t.join()
# Without touching thread sharing, which should be False by default.
exceptions = []
do_thread()
# Forbidden!
self.assertIsInstance(exceptions[0], DatabaseError)
# After calling inc_thread_sharing() on the connection.
connections['default'].inc_thread_sharing()
try:
exceptions = []
do_thread()
# All good
self.assertEqual(exceptions, [])
finally:
connections['default'].dec_thread_sharing()
def test_closing_non_shared_connections(self):
"""
A connection that is not explicitly shareable cannot be closed by
another thread (#17258).
"""
# First, without explicitly enabling the connection for sharing.
exceptions = set()
def runner1():
def runner2(other_thread_connection):
try:
other_thread_connection.close()
except DatabaseError as e:
exceptions.add(e)
t2 = threading.Thread(target=runner2, args=[connections['default']])
t2.start()
t2.join()
t1 = threading.Thread(target=runner1)
t1.start()
t1.join()
# The exception was raised
self.assertEqual(len(exceptions), 1)
# Then, with explicitly enabling the connection for sharing.
exceptions = set()
def runner1():
def runner2(other_thread_connection):
try:
other_thread_connection.close()
except DatabaseError as e:
exceptions.add(e)
# Enable thread sharing
connections['default'].inc_thread_sharing()
try:
t2 = threading.Thread(target=runner2, args=[connections['default']])
t2.start()
t2.join()
finally:
connections['default'].dec_thread_sharing()
t1 = threading.Thread(target=runner1)
t1.start()
t1.join()
# No exception was raised
self.assertEqual(len(exceptions), 0)
def test_thread_sharing_count(self):
self.assertIs(connection.allow_thread_sharing, False)
connection.inc_thread_sharing()
self.assertIs(connection.allow_thread_sharing, True)
connection.inc_thread_sharing()
self.assertIs(connection.allow_thread_sharing, True)
connection.dec_thread_sharing()
self.assertIs(connection.allow_thread_sharing, True)
connection.dec_thread_sharing()
self.assertIs(connection.allow_thread_sharing, False)
msg = 'Cannot decrement the thread sharing count below zero.'
with self.assertRaisesMessage(RuntimeError, msg):
connection.dec_thread_sharing()
class MySQLPKZeroTests(TestCase):
"""
Zero as id for AutoField should raise exception in MySQL, because MySQL
does not allow zero for autoincrement primary key.
"""
@skipIfDBFeature('allows_auto_pk_0')
def test_zero_as_autoval(self):
with self.assertRaises(ValueError):
Square.objects.create(id=0, root=0, square=1)
class DBConstraintTestCase(TestCase):
def test_can_reference_existent(self):
obj = Object.objects.create()
ref = ObjectReference.objects.create(obj=obj)
self.assertEqual(ref.obj, obj)
ref = ObjectReference.objects.get(obj=obj)
self.assertEqual(ref.obj, obj)
def test_can_reference_non_existent(self):
self.assertFalse(Object.objects.filter(id=12345).exists())
ref = ObjectReference.objects.create(obj_id=12345)
ref_new = ObjectReference.objects.get(obj_id=12345)
self.assertEqual(ref, ref_new)
with self.assertRaises(Object.DoesNotExist):
ref.obj
def test_many_to_many(self):
obj = Object.objects.create()
obj.related_objects.create()
self.assertEqual(Object.objects.count(), 2)
self.assertEqual(obj.related_objects.count(), 1)
intermediary_model = Object._meta.get_field("related_objects").remote_field.through
intermediary_model.objects.create(from_object_id=obj.id, to_object_id=12345)
self.assertEqual(obj.related_objects.count(), 1)
self.assertEqual(intermediary_model.objects.count(), 2)
|
d208dbec47164f22ed7994654637f5a0b2c8d6997d141f244b96b443a8dd42d8 | import datetime
import itertools
import unittest
from copy import copy
from unittest import mock
from django.core.management.color import no_style
from django.db import (
DatabaseError, DataError, IntegrityError, OperationalError, connection,
)
from django.db.models import (
CASCADE, PROTECT, AutoField, BigAutoField, BigIntegerField, BinaryField,
BooleanField, CharField, CheckConstraint, DateField, DateTimeField,
ForeignKey, ForeignObject, Index, IntegerField, ManyToManyField, Model,
OneToOneField, PositiveIntegerField, Q, SlugField, SmallAutoField,
SmallIntegerField, TextField, TimeField, UniqueConstraint, UUIDField,
)
from django.db.transaction import TransactionManagementError, atomic
from django.test import (
TransactionTestCase, skipIfDBFeature, skipUnlessDBFeature,
)
from django.test.utils import CaptureQueriesContext, isolate_apps
from django.utils import timezone
from .fields import (
CustomManyToManyField, InheritedManyToManyField, MediumBlobField,
)
from .models import (
Author, AuthorCharFieldWithIndex, AuthorTextFieldWithIndex,
AuthorWithDefaultHeight, AuthorWithEvenLongerName, AuthorWithIndexedName,
AuthorWithIndexedNameAndBirthday, AuthorWithUniqueName,
AuthorWithUniqueNameAndBirthday, Book, BookForeignObj, BookWeak,
BookWithLongName, BookWithO2O, BookWithoutAuthor, BookWithSlug, IntegerPK,
Node, Note, NoteRename, Tag, TagIndexed, TagM2MTest, TagUniqueRename,
Thing, UniqueTest, new_apps,
)
class SchemaTests(TransactionTestCase):
"""
Tests for the schema-alteration code.
Be aware that these tests are more liable than most to false results,
as sometimes the code to check if a test has worked is almost as complex
as the code it is testing.
"""
available_apps = []
models = [
Author, AuthorCharFieldWithIndex, AuthorTextFieldWithIndex,
AuthorWithDefaultHeight, AuthorWithEvenLongerName, Book, BookWeak,
BookWithLongName, BookWithO2O, BookWithSlug, IntegerPK, Node, Note,
Tag, TagIndexed, TagM2MTest, TagUniqueRename, Thing, UniqueTest,
]
# Utility functions
def setUp(self):
# local_models should contain test dependent model classes that will be
# automatically removed from the app cache on test tear down.
self.local_models = []
# isolated_local_models contains models that are in test methods
# decorated with @isolate_apps.
self.isolated_local_models = []
def tearDown(self):
# Delete any tables made for our models
self.delete_tables()
new_apps.clear_cache()
for model in new_apps.get_models():
model._meta._expire_cache()
if 'schema' in new_apps.all_models:
for model in self.local_models:
for many_to_many in model._meta.many_to_many:
through = many_to_many.remote_field.through
if through and through._meta.auto_created:
del new_apps.all_models['schema'][through._meta.model_name]
del new_apps.all_models['schema'][model._meta.model_name]
if self.isolated_local_models:
with connection.schema_editor() as editor:
for model in self.isolated_local_models:
editor.delete_model(model)
def delete_tables(self):
"Deletes all model tables for our models for a clean test environment"
converter = connection.introspection.identifier_converter
with connection.schema_editor() as editor:
connection.disable_constraint_checking()
table_names = connection.introspection.table_names()
for model in itertools.chain(SchemaTests.models, self.local_models):
tbl = converter(model._meta.db_table)
if tbl in table_names:
editor.delete_model(model)
table_names.remove(tbl)
connection.enable_constraint_checking()
def column_classes(self, model):
with connection.cursor() as cursor:
columns = {
d[0]: (connection.introspection.get_field_type(d[1], d), d)
for d in connection.introspection.get_table_description(
cursor,
model._meta.db_table,
)
}
# SQLite has a different format for field_type
for name, (type, desc) in columns.items():
if isinstance(type, tuple):
columns[name] = (type[0], desc)
# SQLite also doesn't error properly
if not columns:
raise DatabaseError("Table does not exist (empty pragma)")
return columns
def get_primary_key(self, table):
with connection.cursor() as cursor:
return connection.introspection.get_primary_key_column(cursor, table)
def get_indexes(self, table):
"""
Get the indexes on the table using a new cursor.
"""
with connection.cursor() as cursor:
return [
c['columns'][0]
for c in connection.introspection.get_constraints(cursor, table).values()
if c['index'] and len(c['columns']) == 1
]
def get_uniques(self, table):
with connection.cursor() as cursor:
return [
c['columns'][0]
for c in connection.introspection.get_constraints(cursor, table).values()
if c['unique'] and len(c['columns']) == 1
]
def get_constraints(self, table):
"""
Get the constraints on a table using a new cursor.
"""
with connection.cursor() as cursor:
return connection.introspection.get_constraints(cursor, table)
def get_constraints_for_column(self, model, column_name):
constraints = self.get_constraints(model._meta.db_table)
constraints_for_column = []
for name, details in constraints.items():
if details['columns'] == [column_name]:
constraints_for_column.append(name)
return sorted(constraints_for_column)
def check_added_field_default(self, schema_editor, model, field, field_name, expected_default,
cast_function=None):
with connection.cursor() as cursor:
schema_editor.add_field(model, field)
cursor.execute("SELECT {} FROM {};".format(field_name, model._meta.db_table))
database_default = cursor.fetchall()[0][0]
if cast_function and not type(database_default) == type(expected_default):
database_default = cast_function(database_default)
self.assertEqual(database_default, expected_default)
def get_constraints_count(self, table, column, fk_to):
"""
Return a dict with keys 'fks', 'uniques, and 'indexes' indicating the
number of foreign keys, unique constraints, and indexes on
`table`.`column`. The `fk_to` argument is a 2-tuple specifying the
expected foreign key relationship's (table, column).
"""
with connection.cursor() as cursor:
constraints = connection.introspection.get_constraints(cursor, table)
counts = {'fks': 0, 'uniques': 0, 'indexes': 0}
for c in constraints.values():
if c['columns'] == [column]:
if c['foreign_key'] == fk_to:
counts['fks'] += 1
if c['unique']:
counts['uniques'] += 1
elif c['index']:
counts['indexes'] += 1
return counts
def assertIndexOrder(self, table, index, order):
constraints = self.get_constraints(table)
self.assertIn(index, constraints)
index_orders = constraints[index]['orders']
self.assertTrue(all(val == expected for val, expected in zip(index_orders, order)))
def assertForeignKeyExists(self, model, column, expected_fk_table, field='id'):
"""
Fail if the FK constraint on `model.Meta.db_table`.`column` to
`expected_fk_table`.id doesn't exist.
"""
constraints = self.get_constraints(model._meta.db_table)
constraint_fk = None
for details in constraints.values():
if details['columns'] == [column] and details['foreign_key']:
constraint_fk = details['foreign_key']
break
self.assertEqual(constraint_fk, (expected_fk_table, field))
def assertForeignKeyNotExists(self, model, column, expected_fk_table):
with self.assertRaises(AssertionError):
self.assertForeignKeyExists(model, column, expected_fk_table)
# Tests
def test_creation_deletion(self):
"""
Tries creating a model's table, and then deleting it.
"""
with connection.schema_editor() as editor:
# Create the table
editor.create_model(Author)
# The table is there
list(Author.objects.all())
# Clean up that table
editor.delete_model(Author)
# No deferred SQL should be left over.
self.assertEqual(editor.deferred_sql, [])
# The table is gone
with self.assertRaises(DatabaseError):
list(Author.objects.all())
@skipUnlessDBFeature('supports_foreign_keys')
def test_fk(self):
"Creating tables out of FK order, then repointing, works"
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Book)
editor.create_model(Author)
editor.create_model(Tag)
# Initial tables are there
list(Author.objects.all())
list(Book.objects.all())
# Make sure the FK constraint is present
with self.assertRaises(IntegrityError):
Book.objects.create(
author_id=1,
title="Much Ado About Foreign Keys",
pub_date=datetime.datetime.now(),
)
# Repoint the FK constraint
old_field = Book._meta.get_field("author")
new_field = ForeignKey(Tag, CASCADE)
new_field.set_attributes_from_name("author")
with connection.schema_editor() as editor:
editor.alter_field(Book, old_field, new_field, strict=True)
self.assertForeignKeyExists(Book, 'author_id', 'schema_tag')
@skipUnlessDBFeature('can_create_inline_fk')
def test_inline_fk(self):
# Create some tables.
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
editor.create_model(Note)
self.assertForeignKeyNotExists(Note, 'book_id', 'schema_book')
# Add a foreign key from one to the other.
with connection.schema_editor() as editor:
new_field = ForeignKey(Book, CASCADE)
new_field.set_attributes_from_name('book')
editor.add_field(Note, new_field)
self.assertForeignKeyExists(Note, 'book_id', 'schema_book')
# Creating a FK field with a constraint uses a single statement without
# a deferred ALTER TABLE.
self.assertFalse([
sql for sql in (str(statement) for statement in editor.deferred_sql)
if sql.startswith('ALTER TABLE') and 'ADD CONSTRAINT' in sql
])
@skipUnlessDBFeature('can_create_inline_fk')
def test_add_inline_fk_update_data(self):
with connection.schema_editor() as editor:
editor.create_model(Node)
# Add an inline foreign key and update data in the same transaction.
new_field = ForeignKey(Node, CASCADE, related_name='new_fk', null=True)
new_field.set_attributes_from_name('new_parent_fk')
parent = Node.objects.create()
with connection.schema_editor() as editor:
editor.add_field(Node, new_field)
editor.execute('UPDATE schema_node SET new_parent_fk_id = %s;', [parent.pk])
self.assertIn('new_parent_fk_id', self.get_indexes(Node._meta.db_table))
@skipUnlessDBFeature(
'can_create_inline_fk',
'allows_multiple_constraints_on_same_fields',
)
@isolate_apps('schema')
def test_add_inline_fk_index_update_data(self):
class Node(Model):
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Node)
# Add an inline foreign key, update data, and an index in the same
# transaction.
new_field = ForeignKey(Node, CASCADE, related_name='new_fk', null=True)
new_field.set_attributes_from_name('new_parent_fk')
parent = Node.objects.create()
with connection.schema_editor() as editor:
editor.add_field(Node, new_field)
Node._meta.add_field(new_field)
editor.execute('UPDATE schema_node SET new_parent_fk_id = %s;', [parent.pk])
editor.add_index(Node, Index(fields=['new_parent_fk'], name='new_parent_inline_fk_idx'))
self.assertIn('new_parent_fk_id', self.get_indexes(Node._meta.db_table))
@skipUnlessDBFeature('supports_foreign_keys')
def test_char_field_with_db_index_to_fk(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(AuthorCharFieldWithIndex)
# Change CharField to FK
old_field = AuthorCharFieldWithIndex._meta.get_field('char_field')
new_field = ForeignKey(Author, CASCADE, blank=True)
new_field.set_attributes_from_name('char_field')
with connection.schema_editor() as editor:
editor.alter_field(AuthorCharFieldWithIndex, old_field, new_field, strict=True)
self.assertForeignKeyExists(AuthorCharFieldWithIndex, 'char_field_id', 'schema_author')
@skipUnlessDBFeature('supports_foreign_keys')
@skipUnlessDBFeature('supports_index_on_text_field')
def test_text_field_with_db_index_to_fk(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(AuthorTextFieldWithIndex)
# Change TextField to FK
old_field = AuthorTextFieldWithIndex._meta.get_field('text_field')
new_field = ForeignKey(Author, CASCADE, blank=True)
new_field.set_attributes_from_name('text_field')
with connection.schema_editor() as editor:
editor.alter_field(AuthorTextFieldWithIndex, old_field, new_field, strict=True)
self.assertForeignKeyExists(AuthorTextFieldWithIndex, 'text_field_id', 'schema_author')
@isolate_apps('schema')
def test_char_field_pk_to_auto_field(self):
class Foo(Model):
id = CharField(max_length=255, primary_key=True)
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Foo)
self.isolated_local_models = [Foo]
old_field = Foo._meta.get_field('id')
new_field = AutoField(primary_key=True)
new_field.set_attributes_from_name('id')
new_field.model = Foo
with connection.schema_editor() as editor:
editor.alter_field(Foo, old_field, new_field, strict=True)
@skipUnlessDBFeature('supports_foreign_keys')
def test_fk_to_proxy(self):
"Creating a FK to a proxy model creates database constraints."
class AuthorProxy(Author):
class Meta:
app_label = 'schema'
apps = new_apps
proxy = True
class AuthorRef(Model):
author = ForeignKey(AuthorProxy, on_delete=CASCADE)
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [AuthorProxy, AuthorRef]
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(AuthorRef)
self.assertForeignKeyExists(AuthorRef, 'author_id', 'schema_author')
@skipUnlessDBFeature('supports_foreign_keys')
def test_fk_db_constraint(self):
"The db_constraint parameter is respected"
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Tag)
editor.create_model(Author)
editor.create_model(BookWeak)
# Initial tables are there
list(Author.objects.all())
list(Tag.objects.all())
list(BookWeak.objects.all())
self.assertForeignKeyNotExists(BookWeak, 'author_id', 'schema_author')
# Make a db_constraint=False FK
new_field = ForeignKey(Tag, CASCADE, db_constraint=False)
new_field.set_attributes_from_name("tag")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
self.assertForeignKeyNotExists(Author, 'tag_id', 'schema_tag')
# Alter to one with a constraint
new_field2 = ForeignKey(Tag, CASCADE)
new_field2.set_attributes_from_name("tag")
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field, new_field2, strict=True)
self.assertForeignKeyExists(Author, 'tag_id', 'schema_tag')
# Alter to one without a constraint again
new_field2 = ForeignKey(Tag, CASCADE)
new_field2.set_attributes_from_name("tag")
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field2, new_field, strict=True)
self.assertForeignKeyNotExists(Author, 'tag_id', 'schema_tag')
@isolate_apps('schema')
def test_no_db_constraint_added_during_primary_key_change(self):
"""
When a primary key that's pointed to by a ForeignKey with
db_constraint=False is altered, a foreign key constraint isn't added.
"""
class Author(Model):
class Meta:
app_label = 'schema'
class BookWeak(Model):
author = ForeignKey(Author, CASCADE, db_constraint=False)
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(BookWeak)
self.assertForeignKeyNotExists(BookWeak, 'author_id', 'schema_author')
old_field = Author._meta.get_field('id')
new_field = BigAutoField(primary_key=True)
new_field.model = Author
new_field.set_attributes_from_name('id')
# @isolate_apps() and inner models are needed to have the model
# relations populated, otherwise this doesn't act as a regression test.
self.assertEqual(len(new_field.model._meta.related_objects), 1)
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
self.assertForeignKeyNotExists(BookWeak, 'author_id', 'schema_author')
def _test_m2m_db_constraint(self, M2MFieldClass):
class LocalAuthorWithM2M(Model):
name = CharField(max_length=255)
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [LocalAuthorWithM2M]
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Tag)
editor.create_model(LocalAuthorWithM2M)
# Initial tables are there
list(LocalAuthorWithM2M.objects.all())
list(Tag.objects.all())
# Make a db_constraint=False FK
new_field = M2MFieldClass(Tag, related_name="authors", db_constraint=False)
new_field.contribute_to_class(LocalAuthorWithM2M, "tags")
# Add the field
with connection.schema_editor() as editor:
editor.add_field(LocalAuthorWithM2M, new_field)
self.assertForeignKeyNotExists(new_field.remote_field.through, 'tag_id', 'schema_tag')
@skipUnlessDBFeature('supports_foreign_keys')
def test_m2m_db_constraint(self):
self._test_m2m_db_constraint(ManyToManyField)
@skipUnlessDBFeature('supports_foreign_keys')
def test_m2m_db_constraint_custom(self):
self._test_m2m_db_constraint(CustomManyToManyField)
@skipUnlessDBFeature('supports_foreign_keys')
def test_m2m_db_constraint_inherited(self):
self._test_m2m_db_constraint(InheritedManyToManyField)
def test_add_field(self):
"""
Tests adding fields to models
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure there's no age field
columns = self.column_classes(Author)
self.assertNotIn("age", columns)
# Add the new field
new_field = IntegerField(null=True)
new_field.set_attributes_from_name("age")
with CaptureQueriesContext(connection) as ctx, connection.schema_editor() as editor:
editor.add_field(Author, new_field)
drop_default_sql = editor.sql_alter_column_no_default % {
'column': editor.quote_name(new_field.name),
}
self.assertFalse(any(drop_default_sql in query['sql'] for query in ctx.captured_queries))
# Ensure the field is right afterwards
columns = self.column_classes(Author)
self.assertEqual(columns['age'][0], "IntegerField")
self.assertTrue(columns['age'][1][6])
def test_add_field_remove_field(self):
"""
Adding a field and removing it removes all deferred sql referring to it.
"""
with connection.schema_editor() as editor:
# Create a table with a unique constraint on the slug field.
editor.create_model(Tag)
# Remove the slug column.
editor.remove_field(Tag, Tag._meta.get_field('slug'))
self.assertEqual(editor.deferred_sql, [])
def test_add_field_temp_default(self):
"""
Tests adding fields to models with a temporary default
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure there's no age field
columns = self.column_classes(Author)
self.assertNotIn("age", columns)
# Add some rows of data
Author.objects.create(name="Andrew", height=30)
Author.objects.create(name="Andrea")
# Add a not-null field
new_field = CharField(max_length=30, default="Godwin")
new_field.set_attributes_from_name("surname")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
# Ensure the field is right afterwards
columns = self.column_classes(Author)
self.assertEqual(columns['surname'][0], "CharField")
self.assertEqual(columns['surname'][1][6],
connection.features.interprets_empty_strings_as_nulls)
def test_add_field_temp_default_boolean(self):
"""
Tests adding fields to models with a temporary default where
the default is False. (#21783)
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure there's no age field
columns = self.column_classes(Author)
self.assertNotIn("age", columns)
# Add some rows of data
Author.objects.create(name="Andrew", height=30)
Author.objects.create(name="Andrea")
# Add a not-null field
new_field = BooleanField(default=False)
new_field.set_attributes_from_name("awesome")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
# Ensure the field is right afterwards
columns = self.column_classes(Author)
# BooleanField are stored as TINYINT(1) on MySQL.
field_type = columns['awesome'][0]
self.assertEqual(field_type, connection.features.introspected_boolean_field_type)
def test_add_field_default_transform(self):
"""
Tests adding fields to models with a default that is not directly
valid in the database (#22581)
"""
class TestTransformField(IntegerField):
# Weird field that saves the count of items in its value
def get_default(self):
return self.default
def get_prep_value(self, value):
if value is None:
return 0
return len(value)
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Add some rows of data
Author.objects.create(name="Andrew", height=30)
Author.objects.create(name="Andrea")
# Add the field with a default it needs to cast (to string in this case)
new_field = TestTransformField(default={1: 2})
new_field.set_attributes_from_name("thing")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
# Ensure the field is there
columns = self.column_classes(Author)
field_type, field_info = columns['thing']
self.assertEqual(field_type, 'IntegerField')
# Make sure the values were transformed correctly
self.assertEqual(Author.objects.extra(where=["thing = 1"]).count(), 2)
def test_add_field_binary(self):
"""
Tests binary fields get a sane default (#22851)
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Add the new field
new_field = BinaryField(blank=True)
new_field.set_attributes_from_name("bits")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
# Ensure the field is right afterwards
columns = self.column_classes(Author)
# MySQL annoyingly uses the same backend, so it'll come back as one of
# these two types.
self.assertIn(columns['bits'][0], ("BinaryField", "TextField"))
@unittest.skipUnless(connection.vendor == 'mysql', "MySQL specific")
def test_add_binaryfield_mediumblob(self):
"""
Test adding a custom-sized binary field on MySQL (#24846).
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Add the new field with default
new_field = MediumBlobField(blank=True, default=b'123')
new_field.set_attributes_from_name('bits')
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
columns = self.column_classes(Author)
# Introspection treats BLOBs as TextFields
self.assertEqual(columns['bits'][0], "TextField")
def test_alter(self):
"""
Tests simple altering of fields
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure the field is right to begin with
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "CharField")
self.assertEqual(bool(columns['name'][1][6]), bool(connection.features.interprets_empty_strings_as_nulls))
# Alter the name field to a TextField
old_field = Author._meta.get_field("name")
new_field = TextField(null=True)
new_field.set_attributes_from_name("name")
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "TextField")
self.assertTrue(columns['name'][1][6])
# Change nullability again
new_field2 = TextField(null=False)
new_field2.set_attributes_from_name("name")
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field, new_field2, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "TextField")
self.assertEqual(bool(columns['name'][1][6]), bool(connection.features.interprets_empty_strings_as_nulls))
def test_alter_auto_field_to_integer_field(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Change AutoField to IntegerField
old_field = Author._meta.get_field('id')
new_field = IntegerField(primary_key=True)
new_field.set_attributes_from_name('id')
new_field.model = Author
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
def test_alter_auto_field_to_char_field(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Change AutoField to CharField
old_field = Author._meta.get_field('id')
new_field = CharField(primary_key=True, max_length=50)
new_field.set_attributes_from_name('id')
new_field.model = Author
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
@isolate_apps('schema')
def test_alter_auto_field_quoted_db_column(self):
class Foo(Model):
id = AutoField(primary_key=True, db_column='"quoted_id"')
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Foo)
self.isolated_local_models = [Foo]
old_field = Foo._meta.get_field('id')
new_field = BigAutoField(primary_key=True)
new_field.model = Foo
new_field.db_column = '"quoted_id"'
new_field.set_attributes_from_name('id')
with connection.schema_editor() as editor:
editor.alter_field(Foo, old_field, new_field, strict=True)
Foo.objects.create()
def test_alter_not_unique_field_to_primary_key(self):
# Create the table.
with connection.schema_editor() as editor:
editor.create_model(Author)
# Change UUIDField to primary key.
old_field = Author._meta.get_field('uuid')
new_field = UUIDField(primary_key=True)
new_field.set_attributes_from_name('uuid')
new_field.model = Author
with connection.schema_editor() as editor:
editor.remove_field(Author, Author._meta.get_field('id'))
editor.alter_field(Author, old_field, new_field, strict=True)
@isolate_apps('schema')
def test_alter_primary_key_quoted_db_table(self):
class Foo(Model):
class Meta:
app_label = 'schema'
db_table = '"foo"'
with connection.schema_editor() as editor:
editor.create_model(Foo)
self.isolated_local_models = [Foo]
old_field = Foo._meta.get_field('id')
new_field = BigAutoField(primary_key=True)
new_field.model = Foo
new_field.set_attributes_from_name('id')
with connection.schema_editor() as editor:
editor.alter_field(Foo, old_field, new_field, strict=True)
Foo.objects.create()
def test_alter_text_field(self):
# Regression for "BLOB/TEXT column 'info' can't have a default value")
# on MySQL.
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Note)
old_field = Note._meta.get_field("info")
new_field = TextField(blank=True)
new_field.set_attributes_from_name("info")
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
@skipUnlessDBFeature('can_defer_constraint_checks', 'can_rollback_ddl')
def test_alter_fk_checks_deferred_constraints(self):
"""
#25492 - Altering a foreign key's structure and data in the same
transaction.
"""
with connection.schema_editor() as editor:
editor.create_model(Node)
old_field = Node._meta.get_field('parent')
new_field = ForeignKey(Node, CASCADE)
new_field.set_attributes_from_name('parent')
parent = Node.objects.create()
with connection.schema_editor() as editor:
# Update the parent FK to create a deferred constraint check.
Node.objects.update(parent=parent)
editor.alter_field(Node, old_field, new_field, strict=True)
def test_alter_text_field_to_date_field(self):
"""
#25002 - Test conversion of text field to date field.
"""
with connection.schema_editor() as editor:
editor.create_model(Note)
Note.objects.create(info='1988-05-05')
old_field = Note._meta.get_field('info')
new_field = DateField(blank=True)
new_field.set_attributes_from_name('info')
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
# Make sure the field isn't nullable
columns = self.column_classes(Note)
self.assertFalse(columns['info'][1][6])
def test_alter_text_field_to_datetime_field(self):
"""
#25002 - Test conversion of text field to datetime field.
"""
with connection.schema_editor() as editor:
editor.create_model(Note)
Note.objects.create(info='1988-05-05 3:16:17.4567')
old_field = Note._meta.get_field('info')
new_field = DateTimeField(blank=True)
new_field.set_attributes_from_name('info')
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
# Make sure the field isn't nullable
columns = self.column_classes(Note)
self.assertFalse(columns['info'][1][6])
def test_alter_text_field_to_time_field(self):
"""
#25002 - Test conversion of text field to time field.
"""
with connection.schema_editor() as editor:
editor.create_model(Note)
Note.objects.create(info='3:16:17.4567')
old_field = Note._meta.get_field('info')
new_field = TimeField(blank=True)
new_field.set_attributes_from_name('info')
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
# Make sure the field isn't nullable
columns = self.column_classes(Note)
self.assertFalse(columns['info'][1][6])
@skipIfDBFeature('interprets_empty_strings_as_nulls')
def test_alter_textual_field_keep_null_status(self):
"""
Changing a field type shouldn't affect the not null status.
"""
with connection.schema_editor() as editor:
editor.create_model(Note)
with self.assertRaises(IntegrityError):
Note.objects.create(info=None)
old_field = Note._meta.get_field("info")
new_field = CharField(max_length=50)
new_field.set_attributes_from_name("info")
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
with self.assertRaises(IntegrityError):
Note.objects.create(info=None)
def test_alter_numeric_field_keep_null_status(self):
"""
Changing a field type shouldn't affect the not null status.
"""
with connection.schema_editor() as editor:
editor.create_model(UniqueTest)
with self.assertRaises(IntegrityError):
UniqueTest.objects.create(year=None, slug='aaa')
old_field = UniqueTest._meta.get_field("year")
new_field = BigIntegerField()
new_field.set_attributes_from_name("year")
with connection.schema_editor() as editor:
editor.alter_field(UniqueTest, old_field, new_field, strict=True)
with self.assertRaises(IntegrityError):
UniqueTest.objects.create(year=None, slug='bbb')
def test_alter_null_to_not_null(self):
"""
#23609 - Tests handling of default values when altering from NULL to NOT NULL.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure the field is right to begin with
columns = self.column_classes(Author)
self.assertTrue(columns['height'][1][6])
# Create some test data
Author.objects.create(name='Not null author', height=12)
Author.objects.create(name='Null author')
# Verify null value
self.assertEqual(Author.objects.get(name='Not null author').height, 12)
self.assertIsNone(Author.objects.get(name='Null author').height)
# Alter the height field to NOT NULL with default
old_field = Author._meta.get_field("height")
new_field = PositiveIntegerField(default=42)
new_field.set_attributes_from_name("height")
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(Author)
self.assertFalse(columns['height'][1][6])
# Verify default value
self.assertEqual(Author.objects.get(name='Not null author').height, 12)
self.assertEqual(Author.objects.get(name='Null author').height, 42)
def test_alter_charfield_to_null(self):
"""
#24307 - Should skip an alter statement on databases with
interprets_empty_strings_as_null when changing a CharField to null.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Change the CharField to null
old_field = Author._meta.get_field('name')
new_field = copy(old_field)
new_field.null = True
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL specific')
def test_alter_char_field_decrease_length(self):
# Create the table.
with connection.schema_editor() as editor:
editor.create_model(Author)
Author.objects.create(name='x' * 255)
# Change max_length of CharField.
old_field = Author._meta.get_field('name')
new_field = CharField(max_length=254)
new_field.set_attributes_from_name('name')
with connection.schema_editor() as editor:
msg = 'value too long for type character varying(254)'
with self.assertRaisesMessage(DataError, msg):
editor.alter_field(Author, old_field, new_field, strict=True)
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL specific')
def test_alter_field_with_custom_db_type(self):
from django.contrib.postgres.fields import ArrayField
class Foo(Model):
field = ArrayField(CharField(max_length=255))
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Foo)
self.isolated_local_models = [Foo]
old_field = Foo._meta.get_field('field')
new_field = ArrayField(CharField(max_length=16))
new_field.set_attributes_from_name('field')
new_field.model = Foo
with connection.schema_editor() as editor:
editor.alter_field(Foo, old_field, new_field, strict=True)
@isolate_apps('schema')
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL specific')
def test_alter_array_field_decrease_base_field_length(self):
from django.contrib.postgres.fields import ArrayField
class ArrayModel(Model):
field = ArrayField(CharField(max_length=16))
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(ArrayModel)
self.isolated_local_models = [ArrayModel]
ArrayModel.objects.create(field=['x' * 16])
old_field = ArrayModel._meta.get_field('field')
new_field = ArrayField(CharField(max_length=15))
new_field.set_attributes_from_name('field')
new_field.model = ArrayModel
with connection.schema_editor() as editor:
msg = 'value too long for type character varying(15)'
with self.assertRaisesMessage(DataError, msg):
editor.alter_field(ArrayModel, old_field, new_field, strict=True)
@isolate_apps('schema')
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL specific')
def test_alter_array_field_decrease_nested_base_field_length(self):
from django.contrib.postgres.fields import ArrayField
class ArrayModel(Model):
field = ArrayField(ArrayField(CharField(max_length=16)))
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(ArrayModel)
self.isolated_local_models = [ArrayModel]
ArrayModel.objects.create(field=[['x' * 16]])
old_field = ArrayModel._meta.get_field('field')
new_field = ArrayField(ArrayField(CharField(max_length=15)))
new_field.set_attributes_from_name('field')
new_field.model = ArrayModel
with connection.schema_editor() as editor:
msg = 'value too long for type character varying(15)'
with self.assertRaisesMessage(DataError, msg):
editor.alter_field(ArrayModel, old_field, new_field, strict=True)
def test_alter_textfield_to_null(self):
"""
#24307 - Should skip an alter statement on databases with
interprets_empty_strings_as_null when changing a TextField to null.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Note)
# Change the TextField to null
old_field = Note._meta.get_field('info')
new_field = copy(old_field)
new_field.null = True
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
@skipUnlessDBFeature('supports_combined_alters')
def test_alter_null_to_not_null_keeping_default(self):
"""
#23738 - Can change a nullable field with default to non-nullable
with the same default.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(AuthorWithDefaultHeight)
# Ensure the field is right to begin with
columns = self.column_classes(AuthorWithDefaultHeight)
self.assertTrue(columns['height'][1][6])
# Alter the height field to NOT NULL keeping the previous default
old_field = AuthorWithDefaultHeight._meta.get_field("height")
new_field = PositiveIntegerField(default=42)
new_field.set_attributes_from_name("height")
with connection.schema_editor() as editor:
editor.alter_field(AuthorWithDefaultHeight, old_field, new_field, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(AuthorWithDefaultHeight)
self.assertFalse(columns['height'][1][6])
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_fk(self):
"""
Tests altering of FKs
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
# Ensure the field is right to begin with
columns = self.column_classes(Book)
self.assertEqual(columns['author_id'][0], "IntegerField")
self.assertForeignKeyExists(Book, 'author_id', 'schema_author')
# Alter the FK
old_field = Book._meta.get_field("author")
new_field = ForeignKey(Author, CASCADE, editable=False)
new_field.set_attributes_from_name("author")
with connection.schema_editor() as editor:
editor.alter_field(Book, old_field, new_field, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(Book)
self.assertEqual(columns['author_id'][0], "IntegerField")
self.assertForeignKeyExists(Book, 'author_id', 'schema_author')
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_to_fk(self):
"""
#24447 - Tests adding a FK constraint for an existing column
"""
class LocalBook(Model):
author = IntegerField()
title = CharField(max_length=100, db_index=True)
pub_date = DateTimeField()
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [LocalBook]
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(LocalBook)
# Ensure no FK constraint exists
constraints = self.get_constraints(LocalBook._meta.db_table)
for details in constraints.values():
if details['foreign_key']:
self.fail('Found an unexpected FK constraint to %s' % details['columns'])
old_field = LocalBook._meta.get_field("author")
new_field = ForeignKey(Author, CASCADE)
new_field.set_attributes_from_name("author")
with connection.schema_editor() as editor:
editor.alter_field(LocalBook, old_field, new_field, strict=True)
self.assertForeignKeyExists(LocalBook, 'author_id', 'schema_author')
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_o2o_to_fk(self):
"""
#24163 - Tests altering of OneToOneField to ForeignKey
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(BookWithO2O)
# Ensure the field is right to begin with
columns = self.column_classes(BookWithO2O)
self.assertEqual(columns['author_id'][0], "IntegerField")
# Ensure the field is unique
author = Author.objects.create(name="Joe")
BookWithO2O.objects.create(author=author, title="Django 1", pub_date=datetime.datetime.now())
with self.assertRaises(IntegrityError):
BookWithO2O.objects.create(author=author, title="Django 2", pub_date=datetime.datetime.now())
BookWithO2O.objects.all().delete()
self.assertForeignKeyExists(BookWithO2O, 'author_id', 'schema_author')
# Alter the OneToOneField to ForeignKey
old_field = BookWithO2O._meta.get_field("author")
new_field = ForeignKey(Author, CASCADE)
new_field.set_attributes_from_name("author")
with connection.schema_editor() as editor:
editor.alter_field(BookWithO2O, old_field, new_field, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(Book)
self.assertEqual(columns['author_id'][0], "IntegerField")
# Ensure the field is not unique anymore
Book.objects.create(author=author, title="Django 1", pub_date=datetime.datetime.now())
Book.objects.create(author=author, title="Django 2", pub_date=datetime.datetime.now())
self.assertForeignKeyExists(Book, 'author_id', 'schema_author')
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_fk_to_o2o(self):
"""
#24163 - Tests altering of ForeignKey to OneToOneField
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
# Ensure the field is right to begin with
columns = self.column_classes(Book)
self.assertEqual(columns['author_id'][0], "IntegerField")
# Ensure the field is not unique
author = Author.objects.create(name="Joe")
Book.objects.create(author=author, title="Django 1", pub_date=datetime.datetime.now())
Book.objects.create(author=author, title="Django 2", pub_date=datetime.datetime.now())
Book.objects.all().delete()
self.assertForeignKeyExists(Book, 'author_id', 'schema_author')
# Alter the ForeignKey to OneToOneField
old_field = Book._meta.get_field("author")
new_field = OneToOneField(Author, CASCADE)
new_field.set_attributes_from_name("author")
with connection.schema_editor() as editor:
editor.alter_field(Book, old_field, new_field, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(BookWithO2O)
self.assertEqual(columns['author_id'][0], "IntegerField")
# Ensure the field is unique now
BookWithO2O.objects.create(author=author, title="Django 1", pub_date=datetime.datetime.now())
with self.assertRaises(IntegrityError):
BookWithO2O.objects.create(author=author, title="Django 2", pub_date=datetime.datetime.now())
self.assertForeignKeyExists(BookWithO2O, 'author_id', 'schema_author')
def test_alter_field_fk_to_o2o(self):
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
expected_fks = 1 if connection.features.supports_foreign_keys else 0
# Check the index is right to begin with.
counts = self.get_constraints_count(
Book._meta.db_table,
Book._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 0, 'indexes': 1})
old_field = Book._meta.get_field('author')
new_field = OneToOneField(Author, CASCADE)
new_field.set_attributes_from_name('author')
with connection.schema_editor() as editor:
editor.alter_field(Book, old_field, new_field, strict=True)
counts = self.get_constraints_count(
Book._meta.db_table,
Book._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
# The index on ForeignKey is replaced with a unique constraint for OneToOneField.
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 1, 'indexes': 0})
def test_alter_field_fk_keeps_index(self):
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
expected_fks = 1 if connection.features.supports_foreign_keys else 0
# Check the index is right to begin with.
counts = self.get_constraints_count(
Book._meta.db_table,
Book._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 0, 'indexes': 1})
old_field = Book._meta.get_field('author')
# on_delete changed from CASCADE.
new_field = ForeignKey(Author, PROTECT)
new_field.set_attributes_from_name('author')
with connection.schema_editor() as editor:
editor.alter_field(Book, old_field, new_field, strict=True)
counts = self.get_constraints_count(
Book._meta.db_table,
Book._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
# The index remains.
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 0, 'indexes': 1})
def test_alter_field_o2o_to_fk(self):
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(BookWithO2O)
expected_fks = 1 if connection.features.supports_foreign_keys else 0
# Check the unique constraint is right to begin with.
counts = self.get_constraints_count(
BookWithO2O._meta.db_table,
BookWithO2O._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 1, 'indexes': 0})
old_field = BookWithO2O._meta.get_field('author')
new_field = ForeignKey(Author, CASCADE)
new_field.set_attributes_from_name('author')
with connection.schema_editor() as editor:
editor.alter_field(BookWithO2O, old_field, new_field, strict=True)
counts = self.get_constraints_count(
BookWithO2O._meta.db_table,
BookWithO2O._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
# The unique constraint on OneToOneField is replaced with an index for ForeignKey.
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 0, 'indexes': 1})
def test_alter_field_o2o_keeps_unique(self):
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(BookWithO2O)
expected_fks = 1 if connection.features.supports_foreign_keys else 0
# Check the unique constraint is right to begin with.
counts = self.get_constraints_count(
BookWithO2O._meta.db_table,
BookWithO2O._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 1, 'indexes': 0})
old_field = BookWithO2O._meta.get_field('author')
# on_delete changed from CASCADE.
new_field = OneToOneField(Author, PROTECT)
new_field.set_attributes_from_name('author')
with connection.schema_editor() as editor:
editor.alter_field(BookWithO2O, old_field, new_field, strict=True)
counts = self.get_constraints_count(
BookWithO2O._meta.db_table,
BookWithO2O._meta.get_field('author').column,
(Author._meta.db_table, Author._meta.pk.column),
)
# The unique constraint remains.
self.assertEqual(counts, {'fks': expected_fks, 'uniques': 1, 'indexes': 0})
@skipUnlessDBFeature('ignores_table_name_case')
def test_alter_db_table_case(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Alter the case of the table
old_table_name = Author._meta.db_table
with connection.schema_editor() as editor:
editor.alter_db_table(Author, old_table_name, old_table_name.upper())
def test_alter_implicit_id_to_explicit(self):
"""
Should be able to convert an implicit "id" field to an explicit "id"
primary key field.
"""
with connection.schema_editor() as editor:
editor.create_model(Author)
old_field = Author._meta.get_field("id")
new_field = AutoField(primary_key=True)
new_field.set_attributes_from_name("id")
new_field.model = Author
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
# This will fail if DROP DEFAULT is inadvertently executed on this
# field which drops the id sequence, at least on PostgreSQL.
Author.objects.create(name='Foo')
Author.objects.create(name='Bar')
def test_alter_autofield_pk_to_bigautofield_pk_sequence_owner(self):
"""
Converting an implicit PK to BigAutoField(primary_key=True) should keep
a sequence owner on PostgreSQL.
"""
with connection.schema_editor() as editor:
editor.create_model(Author)
old_field = Author._meta.get_field('id')
new_field = BigAutoField(primary_key=True)
new_field.set_attributes_from_name('id')
new_field.model = Author
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
Author.objects.create(name='Foo', pk=1)
with connection.cursor() as cursor:
sequence_reset_sqls = connection.ops.sequence_reset_sql(no_style(), [Author])
if sequence_reset_sqls:
cursor.execute(sequence_reset_sqls[0])
# Fail on PostgreSQL if sequence is missing an owner.
self.assertIsNotNone(Author.objects.create(name='Bar'))
def test_alter_autofield_pk_to_smallautofield_pk_sequence_owner(self):
"""
Converting an implicit PK to SmallAutoField(primary_key=True) should
keep a sequence owner on PostgreSQL.
"""
with connection.schema_editor() as editor:
editor.create_model(Author)
old_field = Author._meta.get_field('id')
new_field = SmallAutoField(primary_key=True)
new_field.set_attributes_from_name('id')
new_field.model = Author
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
Author.objects.create(name='Foo', pk=1)
with connection.cursor() as cursor:
sequence_reset_sqls = connection.ops.sequence_reset_sql(no_style(), [Author])
if sequence_reset_sqls:
cursor.execute(sequence_reset_sqls[0])
# Fail on PostgreSQL if sequence is missing an owner.
self.assertIsNotNone(Author.objects.create(name='Bar'))
def test_alter_int_pk_to_autofield_pk(self):
"""
Should be able to rename an IntegerField(primary_key=True) to
AutoField(primary_key=True).
"""
with connection.schema_editor() as editor:
editor.create_model(IntegerPK)
old_field = IntegerPK._meta.get_field('i')
new_field = AutoField(primary_key=True)
new_field.model = IntegerPK
new_field.set_attributes_from_name('i')
with connection.schema_editor() as editor:
editor.alter_field(IntegerPK, old_field, new_field, strict=True)
def test_alter_int_pk_to_bigautofield_pk(self):
"""
Should be able to rename an IntegerField(primary_key=True) to
BigAutoField(primary_key=True).
"""
with connection.schema_editor() as editor:
editor.create_model(IntegerPK)
old_field = IntegerPK._meta.get_field('i')
new_field = BigAutoField(primary_key=True)
new_field.model = IntegerPK
new_field.set_attributes_from_name('i')
with connection.schema_editor() as editor:
editor.alter_field(IntegerPK, old_field, new_field, strict=True)
@isolate_apps('schema')
def test_alter_smallint_pk_to_smallautofield_pk(self):
"""
Should be able to rename an SmallIntegerField(primary_key=True) to
SmallAutoField(primary_key=True).
"""
class SmallIntegerPK(Model):
i = SmallIntegerField(primary_key=True)
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(SmallIntegerPK)
self.isolated_local_models = [SmallIntegerPK]
old_field = SmallIntegerPK._meta.get_field('i')
new_field = SmallAutoField(primary_key=True)
new_field.model = SmallIntegerPK
new_field.set_attributes_from_name('i')
with connection.schema_editor() as editor:
editor.alter_field(SmallIntegerPK, old_field, new_field, strict=True)
def test_alter_int_pk_to_int_unique(self):
"""
Should be able to rename an IntegerField(primary_key=True) to
IntegerField(unique=True).
"""
with connection.schema_editor() as editor:
editor.create_model(IntegerPK)
# Delete the old PK
old_field = IntegerPK._meta.get_field('i')
new_field = IntegerField(unique=True)
new_field.model = IntegerPK
new_field.set_attributes_from_name('i')
with connection.schema_editor() as editor:
editor.alter_field(IntegerPK, old_field, new_field, strict=True)
# The primary key constraint is gone. Result depends on database:
# 'id' for SQLite, None for others (must not be 'i').
self.assertIn(self.get_primary_key(IntegerPK._meta.db_table), ('id', None))
# Set up a model class as it currently stands. The original IntegerPK
# class is now out of date and some backends make use of the whole
# model class when modifying a field (such as sqlite3 when remaking a
# table) so an outdated model class leads to incorrect results.
class Transitional(Model):
i = IntegerField(unique=True)
j = IntegerField(unique=True)
class Meta:
app_label = 'schema'
apps = new_apps
db_table = 'INTEGERPK'
# model requires a new PK
old_field = Transitional._meta.get_field('j')
new_field = IntegerField(primary_key=True)
new_field.model = Transitional
new_field.set_attributes_from_name('j')
with connection.schema_editor() as editor:
editor.alter_field(Transitional, old_field, new_field, strict=True)
# Create a model class representing the updated model.
class IntegerUnique(Model):
i = IntegerField(unique=True)
j = IntegerField(primary_key=True)
class Meta:
app_label = 'schema'
apps = new_apps
db_table = 'INTEGERPK'
# Ensure unique constraint works.
IntegerUnique.objects.create(i=1, j=1)
with self.assertRaises(IntegrityError):
IntegerUnique.objects.create(i=1, j=2)
def test_rename(self):
"""
Tests simple altering of fields
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure the field is right to begin with
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "CharField")
self.assertNotIn("display_name", columns)
# Alter the name field's name
old_field = Author._meta.get_field("name")
new_field = CharField(max_length=254)
new_field.set_attributes_from_name("display_name")
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
# Ensure the field is right afterwards
columns = self.column_classes(Author)
self.assertEqual(columns['display_name'][0], "CharField")
self.assertNotIn("name", columns)
@isolate_apps('schema')
def test_rename_referenced_field(self):
class Author(Model):
name = CharField(max_length=255, unique=True)
class Meta:
app_label = 'schema'
class Book(Model):
author = ForeignKey(Author, CASCADE, to_field='name')
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
new_field = CharField(max_length=255, unique=True)
new_field.set_attributes_from_name('renamed')
with connection.schema_editor(atomic=connection.features.supports_atomic_references_rename) as editor:
editor.alter_field(Author, Author._meta.get_field('name'), new_field)
# Ensure the foreign key reference was updated.
self.assertForeignKeyExists(Book, 'author_id', 'schema_author', 'renamed')
@skipIfDBFeature('interprets_empty_strings_as_nulls')
def test_rename_keep_null_status(self):
"""
Renaming a field shouldn't affect the not null status.
"""
with connection.schema_editor() as editor:
editor.create_model(Note)
with self.assertRaises(IntegrityError):
Note.objects.create(info=None)
old_field = Note._meta.get_field("info")
new_field = TextField()
new_field.set_attributes_from_name("detail_info")
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
columns = self.column_classes(Note)
self.assertEqual(columns['detail_info'][0], "TextField")
self.assertNotIn("info", columns)
with self.assertRaises(IntegrityError):
NoteRename.objects.create(detail_info=None)
def _test_m2m_create(self, M2MFieldClass):
"""
Tests M2M fields on models during creation
"""
class LocalBookWithM2M(Model):
author = ForeignKey(Author, CASCADE)
title = CharField(max_length=100, db_index=True)
pub_date = DateTimeField()
tags = M2MFieldClass("TagM2MTest", related_name="books")
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [LocalBookWithM2M]
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(TagM2MTest)
editor.create_model(LocalBookWithM2M)
# Ensure there is now an m2m table there
columns = self.column_classes(LocalBookWithM2M._meta.get_field("tags").remote_field.through)
self.assertEqual(columns['tagm2mtest_id'][0], "IntegerField")
def test_m2m_create(self):
self._test_m2m_create(ManyToManyField)
def test_m2m_create_custom(self):
self._test_m2m_create(CustomManyToManyField)
def test_m2m_create_inherited(self):
self._test_m2m_create(InheritedManyToManyField)
def _test_m2m_create_through(self, M2MFieldClass):
"""
Tests M2M fields on models during creation with through models
"""
class LocalTagThrough(Model):
book = ForeignKey("schema.LocalBookWithM2MThrough", CASCADE)
tag = ForeignKey("schema.TagM2MTest", CASCADE)
class Meta:
app_label = 'schema'
apps = new_apps
class LocalBookWithM2MThrough(Model):
tags = M2MFieldClass("TagM2MTest", related_name="books", through=LocalTagThrough)
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [LocalTagThrough, LocalBookWithM2MThrough]
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(LocalTagThrough)
editor.create_model(TagM2MTest)
editor.create_model(LocalBookWithM2MThrough)
# Ensure there is now an m2m table there
columns = self.column_classes(LocalTagThrough)
self.assertEqual(columns['book_id'][0], "IntegerField")
self.assertEqual(columns['tag_id'][0], "IntegerField")
def test_m2m_create_through(self):
self._test_m2m_create_through(ManyToManyField)
def test_m2m_create_through_custom(self):
self._test_m2m_create_through(CustomManyToManyField)
def test_m2m_create_through_inherited(self):
self._test_m2m_create_through(InheritedManyToManyField)
def _test_m2m(self, M2MFieldClass):
"""
Tests adding/removing M2M fields on models
"""
class LocalAuthorWithM2M(Model):
name = CharField(max_length=255)
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [LocalAuthorWithM2M]
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(LocalAuthorWithM2M)
editor.create_model(TagM2MTest)
# Create an M2M field
new_field = M2MFieldClass("schema.TagM2MTest", related_name="authors")
new_field.contribute_to_class(LocalAuthorWithM2M, "tags")
# Ensure there's no m2m table there
with self.assertRaises(DatabaseError):
self.column_classes(new_field.remote_field.through)
# Add the field
with connection.schema_editor() as editor:
editor.add_field(LocalAuthorWithM2M, new_field)
# Ensure there is now an m2m table there
columns = self.column_classes(new_field.remote_field.through)
self.assertEqual(columns['tagm2mtest_id'][0], "IntegerField")
# "Alter" the field. This should not rename the DB table to itself.
with connection.schema_editor() as editor:
editor.alter_field(LocalAuthorWithM2M, new_field, new_field, strict=True)
# Remove the M2M table again
with connection.schema_editor() as editor:
editor.remove_field(LocalAuthorWithM2M, new_field)
# Ensure there's no m2m table there
with self.assertRaises(DatabaseError):
self.column_classes(new_field.remote_field.through)
# Make sure the model state is coherent with the table one now that
# we've removed the tags field.
opts = LocalAuthorWithM2M._meta
opts.local_many_to_many.remove(new_field)
del new_apps.all_models['schema'][new_field.remote_field.through._meta.model_name]
opts._expire_cache()
def test_m2m(self):
self._test_m2m(ManyToManyField)
def test_m2m_custom(self):
self._test_m2m(CustomManyToManyField)
def test_m2m_inherited(self):
self._test_m2m(InheritedManyToManyField)
def _test_m2m_through_alter(self, M2MFieldClass):
"""
Tests altering M2Ms with explicit through models (should no-op)
"""
class LocalAuthorTag(Model):
author = ForeignKey("schema.LocalAuthorWithM2MThrough", CASCADE)
tag = ForeignKey("schema.TagM2MTest", CASCADE)
class Meta:
app_label = 'schema'
apps = new_apps
class LocalAuthorWithM2MThrough(Model):
name = CharField(max_length=255)
tags = M2MFieldClass("schema.TagM2MTest", related_name="authors", through=LocalAuthorTag)
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [LocalAuthorTag, LocalAuthorWithM2MThrough]
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(LocalAuthorTag)
editor.create_model(LocalAuthorWithM2MThrough)
editor.create_model(TagM2MTest)
# Ensure the m2m table is there
self.assertEqual(len(self.column_classes(LocalAuthorTag)), 3)
# "Alter" the field's blankness. This should not actually do anything.
old_field = LocalAuthorWithM2MThrough._meta.get_field("tags")
new_field = M2MFieldClass("schema.TagM2MTest", related_name="authors", through=LocalAuthorTag)
new_field.contribute_to_class(LocalAuthorWithM2MThrough, "tags")
with connection.schema_editor() as editor:
editor.alter_field(LocalAuthorWithM2MThrough, old_field, new_field, strict=True)
# Ensure the m2m table is still there
self.assertEqual(len(self.column_classes(LocalAuthorTag)), 3)
def test_m2m_through_alter(self):
self._test_m2m_through_alter(ManyToManyField)
def test_m2m_through_alter_custom(self):
self._test_m2m_through_alter(CustomManyToManyField)
def test_m2m_through_alter_inherited(self):
self._test_m2m_through_alter(InheritedManyToManyField)
def _test_m2m_repoint(self, M2MFieldClass):
"""
Tests repointing M2M fields
"""
class LocalBookWithM2M(Model):
author = ForeignKey(Author, CASCADE)
title = CharField(max_length=100, db_index=True)
pub_date = DateTimeField()
tags = M2MFieldClass("TagM2MTest", related_name="books")
class Meta:
app_label = 'schema'
apps = new_apps
self.local_models = [LocalBookWithM2M]
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(LocalBookWithM2M)
editor.create_model(TagM2MTest)
editor.create_model(UniqueTest)
# Ensure the M2M exists and points to TagM2MTest
if connection.features.supports_foreign_keys:
self.assertForeignKeyExists(
LocalBookWithM2M._meta.get_field("tags").remote_field.through,
'tagm2mtest_id',
'schema_tagm2mtest',
)
# Repoint the M2M
old_field = LocalBookWithM2M._meta.get_field("tags")
new_field = M2MFieldClass(UniqueTest)
new_field.contribute_to_class(LocalBookWithM2M, "uniques")
with connection.schema_editor() as editor:
editor.alter_field(LocalBookWithM2M, old_field, new_field, strict=True)
# Ensure old M2M is gone
with self.assertRaises(DatabaseError):
self.column_classes(LocalBookWithM2M._meta.get_field("tags").remote_field.through)
# This model looks like the new model and is used for teardown.
opts = LocalBookWithM2M._meta
opts.local_many_to_many.remove(old_field)
# Ensure the new M2M exists and points to UniqueTest
if connection.features.supports_foreign_keys:
self.assertForeignKeyExists(new_field.remote_field.through, 'uniquetest_id', 'schema_uniquetest')
def test_m2m_repoint(self):
self._test_m2m_repoint(ManyToManyField)
def test_m2m_repoint_custom(self):
self._test_m2m_repoint(CustomManyToManyField)
def test_m2m_repoint_inherited(self):
self._test_m2m_repoint(InheritedManyToManyField)
@isolate_apps('schema')
def test_m2m_rename_field_in_target_model(self):
class LocalTagM2MTest(Model):
title = CharField(max_length=255)
class Meta:
app_label = 'schema'
class LocalM2M(Model):
tags = ManyToManyField(LocalTagM2MTest)
class Meta:
app_label = 'schema'
# Create the tables.
with connection.schema_editor() as editor:
editor.create_model(LocalM2M)
editor.create_model(LocalTagM2MTest)
self.isolated_local_models = [LocalM2M, LocalTagM2MTest]
# Ensure the m2m table is there.
self.assertEqual(len(self.column_classes(LocalM2M)), 1)
# Alter a field in LocalTagM2MTest.
old_field = LocalTagM2MTest._meta.get_field('title')
new_field = CharField(max_length=254)
new_field.contribute_to_class(LocalTagM2MTest, 'title1')
# @isolate_apps() and inner models are needed to have the model
# relations populated, otherwise this doesn't act as a regression test.
self.assertEqual(len(new_field.model._meta.related_objects), 1)
with connection.schema_editor() as editor:
editor.alter_field(LocalTagM2MTest, old_field, new_field, strict=True)
# Ensure the m2m table is still there.
self.assertEqual(len(self.column_classes(LocalM2M)), 1)
@skipUnlessDBFeature('supports_column_check_constraints', 'can_introspect_check_constraints')
def test_check_constraints(self):
"""
Tests creating/deleting CHECK constraints
"""
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure the constraint exists
constraints = self.get_constraints(Author._meta.db_table)
if not any(details['columns'] == ['height'] and details['check'] for details in constraints.values()):
self.fail("No check constraint for height found")
# Alter the column to remove it
old_field = Author._meta.get_field("height")
new_field = IntegerField(null=True, blank=True)
new_field.set_attributes_from_name("height")
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
constraints = self.get_constraints(Author._meta.db_table)
for details in constraints.values():
if details['columns'] == ["height"] and details['check']:
self.fail("Check constraint for height found")
# Alter the column to re-add it
new_field2 = Author._meta.get_field("height")
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field, new_field2, strict=True)
constraints = self.get_constraints(Author._meta.db_table)
if not any(details['columns'] == ['height'] and details['check'] for details in constraints.values()):
self.fail("No check constraint for height found")
@skipUnlessDBFeature('supports_column_check_constraints', 'can_introspect_check_constraints')
def test_remove_field_check_does_not_remove_meta_constraints(self):
with connection.schema_editor() as editor:
editor.create_model(Author)
# Add the custom check constraint
constraint = CheckConstraint(check=Q(height__gte=0), name='author_height_gte_0_check')
custom_constraint_name = constraint.name
Author._meta.constraints = [constraint]
with connection.schema_editor() as editor:
editor.add_constraint(Author, constraint)
# Ensure the constraints exist
constraints = self.get_constraints(Author._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['height'] and details['check'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 1)
# Alter the column to remove field check
old_field = Author._meta.get_field('height')
new_field = IntegerField(null=True, blank=True)
new_field.set_attributes_from_name('height')
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
constraints = self.get_constraints(Author._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['height'] and details['check'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 0)
# Alter the column to re-add field check
new_field2 = Author._meta.get_field('height')
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field, new_field2, strict=True)
constraints = self.get_constraints(Author._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['height'] and details['check'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 1)
# Drop the check constraint
with connection.schema_editor() as editor:
Author._meta.constraints = []
editor.remove_constraint(Author, constraint)
def test_unique(self):
"""
Tests removing and adding unique constraints to a single column.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Tag)
# Ensure the field is unique to begin with
Tag.objects.create(title="foo", slug="foo")
with self.assertRaises(IntegrityError):
Tag.objects.create(title="bar", slug="foo")
Tag.objects.all().delete()
# Alter the slug field to be non-unique
old_field = Tag._meta.get_field("slug")
new_field = SlugField(unique=False)
new_field.set_attributes_from_name("slug")
with connection.schema_editor() as editor:
editor.alter_field(Tag, old_field, new_field, strict=True)
# Ensure the field is no longer unique
Tag.objects.create(title="foo", slug="foo")
Tag.objects.create(title="bar", slug="foo")
Tag.objects.all().delete()
# Alter the slug field to be unique
new_field2 = SlugField(unique=True)
new_field2.set_attributes_from_name("slug")
with connection.schema_editor() as editor:
editor.alter_field(Tag, new_field, new_field2, strict=True)
# Ensure the field is unique again
Tag.objects.create(title="foo", slug="foo")
with self.assertRaises(IntegrityError):
Tag.objects.create(title="bar", slug="foo")
Tag.objects.all().delete()
# Rename the field
new_field3 = SlugField(unique=True)
new_field3.set_attributes_from_name("slug2")
with connection.schema_editor() as editor:
editor.alter_field(Tag, new_field2, new_field3, strict=True)
# Ensure the field is still unique
TagUniqueRename.objects.create(title="foo", slug2="foo")
with self.assertRaises(IntegrityError):
TagUniqueRename.objects.create(title="bar", slug2="foo")
Tag.objects.all().delete()
def test_unique_name_quoting(self):
old_table_name = TagUniqueRename._meta.db_table
try:
with connection.schema_editor() as editor:
editor.create_model(TagUniqueRename)
editor.alter_db_table(TagUniqueRename, old_table_name, 'unique-table')
TagUniqueRename._meta.db_table = 'unique-table'
# This fails if the unique index name isn't quoted.
editor.alter_unique_together(TagUniqueRename, [], (('title', 'slug2'),))
finally:
TagUniqueRename._meta.db_table = old_table_name
@isolate_apps('schema')
@unittest.skipIf(connection.vendor == 'sqlite', 'SQLite naively remakes the table on field alteration.')
@skipUnlessDBFeature('supports_foreign_keys')
def test_unique_no_unnecessary_fk_drops(self):
"""
If AlterField isn't selective about dropping foreign key constraints
when modifying a field with a unique constraint, the AlterField
incorrectly drops and recreates the Book.author foreign key even though
it doesn't restrict the field being changed (#29193).
"""
class Author(Model):
name = CharField(max_length=254, unique=True)
class Meta:
app_label = 'schema'
class Book(Model):
author = ForeignKey(Author, CASCADE)
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
new_field = CharField(max_length=255, unique=True)
new_field.model = Author
new_field.set_attributes_from_name('name')
with self.assertLogs('django.db.backends.schema', 'DEBUG') as cm:
with connection.schema_editor() as editor:
editor.alter_field(Author, Author._meta.get_field('name'), new_field)
# One SQL statement is executed to alter the field.
self.assertEqual(len(cm.records), 1)
@isolate_apps('schema')
@unittest.skipIf(connection.vendor == 'sqlite', 'SQLite remakes the table on field alteration.')
def test_unique_and_reverse_m2m(self):
"""
AlterField can modify a unique field when there's a reverse M2M
relation on the model.
"""
class Tag(Model):
title = CharField(max_length=255)
slug = SlugField(unique=True)
class Meta:
app_label = 'schema'
class Book(Model):
tags = ManyToManyField(Tag, related_name='books')
class Meta:
app_label = 'schema'
self.isolated_local_models = [Book._meta.get_field('tags').remote_field.through]
with connection.schema_editor() as editor:
editor.create_model(Tag)
editor.create_model(Book)
new_field = SlugField(max_length=75, unique=True)
new_field.model = Tag
new_field.set_attributes_from_name('slug')
with self.assertLogs('django.db.backends.schema', 'DEBUG') as cm:
with connection.schema_editor() as editor:
editor.alter_field(Tag, Tag._meta.get_field('slug'), new_field)
# One SQL statement is executed to alter the field.
self.assertEqual(len(cm.records), 1)
# Ensure that the field is still unique.
Tag.objects.create(title='foo', slug='foo')
with self.assertRaises(IntegrityError):
Tag.objects.create(title='bar', slug='foo')
@skipUnlessDBFeature('allows_multiple_constraints_on_same_fields')
def test_remove_field_unique_does_not_remove_meta_constraints(self):
with connection.schema_editor() as editor:
editor.create_model(AuthorWithUniqueName)
# Add the custom unique constraint
constraint = UniqueConstraint(fields=['name'], name='author_name_uniq')
custom_constraint_name = constraint.name
AuthorWithUniqueName._meta.constraints = [constraint]
with connection.schema_editor() as editor:
editor.add_constraint(AuthorWithUniqueName, constraint)
# Ensure the constraints exist
constraints = self.get_constraints(AuthorWithUniqueName._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name'] and details['unique'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 1)
# Alter the column to remove field uniqueness
old_field = AuthorWithUniqueName._meta.get_field('name')
new_field = CharField(max_length=255)
new_field.set_attributes_from_name('name')
with connection.schema_editor() as editor:
editor.alter_field(AuthorWithUniqueName, old_field, new_field, strict=True)
constraints = self.get_constraints(AuthorWithUniqueName._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name'] and details['unique'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 0)
# Alter the column to re-add field uniqueness
new_field2 = AuthorWithUniqueName._meta.get_field('name')
with connection.schema_editor() as editor:
editor.alter_field(AuthorWithUniqueName, new_field, new_field2, strict=True)
constraints = self.get_constraints(AuthorWithUniqueName._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name'] and details['unique'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 1)
# Drop the unique constraint
with connection.schema_editor() as editor:
AuthorWithUniqueName._meta.constraints = []
editor.remove_constraint(AuthorWithUniqueName, constraint)
def test_unique_together(self):
"""
Tests removing and adding unique_together constraints on a model.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(UniqueTest)
# Ensure the fields are unique to begin with
UniqueTest.objects.create(year=2012, slug="foo")
UniqueTest.objects.create(year=2011, slug="foo")
UniqueTest.objects.create(year=2011, slug="bar")
with self.assertRaises(IntegrityError):
UniqueTest.objects.create(year=2012, slug="foo")
UniqueTest.objects.all().delete()
# Alter the model to its non-unique-together companion
with connection.schema_editor() as editor:
editor.alter_unique_together(UniqueTest, UniqueTest._meta.unique_together, [])
# Ensure the fields are no longer unique
UniqueTest.objects.create(year=2012, slug="foo")
UniqueTest.objects.create(year=2012, slug="foo")
UniqueTest.objects.all().delete()
# Alter it back
new_field2 = SlugField(unique=True)
new_field2.set_attributes_from_name("slug")
with connection.schema_editor() as editor:
editor.alter_unique_together(UniqueTest, [], UniqueTest._meta.unique_together)
# Ensure the fields are unique again
UniqueTest.objects.create(year=2012, slug="foo")
with self.assertRaises(IntegrityError):
UniqueTest.objects.create(year=2012, slug="foo")
UniqueTest.objects.all().delete()
def test_unique_together_with_fk(self):
"""
Tests removing and adding unique_together constraints that include
a foreign key.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
# Ensure the fields are unique to begin with
self.assertEqual(Book._meta.unique_together, ())
# Add the unique_together constraint
with connection.schema_editor() as editor:
editor.alter_unique_together(Book, [], [['author', 'title']])
# Alter it back
with connection.schema_editor() as editor:
editor.alter_unique_together(Book, [['author', 'title']], [])
def test_unique_together_with_fk_with_existing_index(self):
"""
Tests removing and adding unique_together constraints that include
a foreign key, where the foreign key is added after the model is
created.
"""
# Create the tables
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(BookWithoutAuthor)
new_field = ForeignKey(Author, CASCADE)
new_field.set_attributes_from_name('author')
editor.add_field(BookWithoutAuthor, new_field)
# Ensure the fields aren't unique to begin with
self.assertEqual(Book._meta.unique_together, ())
# Add the unique_together constraint
with connection.schema_editor() as editor:
editor.alter_unique_together(Book, [], [['author', 'title']])
# Alter it back
with connection.schema_editor() as editor:
editor.alter_unique_together(Book, [['author', 'title']], [])
@skipUnlessDBFeature('allows_multiple_constraints_on_same_fields')
def test_remove_unique_together_does_not_remove_meta_constraints(self):
with connection.schema_editor() as editor:
editor.create_model(AuthorWithUniqueNameAndBirthday)
# Add the custom unique constraint
constraint = UniqueConstraint(fields=['name', 'birthday'], name='author_name_birthday_uniq')
custom_constraint_name = constraint.name
AuthorWithUniqueNameAndBirthday._meta.constraints = [constraint]
with connection.schema_editor() as editor:
editor.add_constraint(AuthorWithUniqueNameAndBirthday, constraint)
# Ensure the constraints exist
constraints = self.get_constraints(AuthorWithUniqueNameAndBirthday._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name', 'birthday'] and details['unique'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 1)
# Remove unique together
unique_together = AuthorWithUniqueNameAndBirthday._meta.unique_together
with connection.schema_editor() as editor:
editor.alter_unique_together(AuthorWithUniqueNameAndBirthday, unique_together, [])
constraints = self.get_constraints(AuthorWithUniqueNameAndBirthday._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name', 'birthday'] and details['unique'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 0)
# Re-add unique together
with connection.schema_editor() as editor:
editor.alter_unique_together(AuthorWithUniqueNameAndBirthday, [], unique_together)
constraints = self.get_constraints(AuthorWithUniqueNameAndBirthday._meta.db_table)
self.assertIn(custom_constraint_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name', 'birthday'] and details['unique'] and name != custom_constraint_name
]
self.assertEqual(len(other_constraints), 1)
# Drop the unique constraint
with connection.schema_editor() as editor:
AuthorWithUniqueNameAndBirthday._meta.constraints = []
editor.remove_constraint(AuthorWithUniqueNameAndBirthday, constraint)
def test_index_together(self):
"""
Tests removing and adding index_together constraints on a model.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Tag)
# Ensure there's no index on the year/slug columns first
self.assertIs(
any(
c["index"]
for c in self.get_constraints("schema_tag").values()
if c['columns'] == ["slug", "title"]
),
False,
)
# Alter the model to add an index
with connection.schema_editor() as editor:
editor.alter_index_together(Tag, [], [("slug", "title")])
# Ensure there is now an index
self.assertIs(
any(
c["index"]
for c in self.get_constraints("schema_tag").values()
if c['columns'] == ["slug", "title"]
),
True,
)
# Alter it back
new_field2 = SlugField(unique=True)
new_field2.set_attributes_from_name("slug")
with connection.schema_editor() as editor:
editor.alter_index_together(Tag, [("slug", "title")], [])
# Ensure there's no index
self.assertIs(
any(
c["index"]
for c in self.get_constraints("schema_tag").values()
if c['columns'] == ["slug", "title"]
),
False,
)
def test_index_together_with_fk(self):
"""
Tests removing and adding index_together constraints that include
a foreign key.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
# Ensure the fields are unique to begin with
self.assertEqual(Book._meta.index_together, ())
# Add the unique_together constraint
with connection.schema_editor() as editor:
editor.alter_index_together(Book, [], [['author', 'title']])
# Alter it back
with connection.schema_editor() as editor:
editor.alter_index_together(Book, [['author', 'title']], [])
def test_create_index_together(self):
"""
Tests creating models with index_together already defined
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(TagIndexed)
# Ensure there is an index
self.assertIs(
any(
c["index"]
for c in self.get_constraints("schema_tagindexed").values()
if c['columns'] == ["slug", "title"]
),
True,
)
@skipUnlessDBFeature('allows_multiple_constraints_on_same_fields')
def test_remove_index_together_does_not_remove_meta_indexes(self):
with connection.schema_editor() as editor:
editor.create_model(AuthorWithIndexedNameAndBirthday)
# Add the custom index
index = Index(fields=['name', 'birthday'], name='author_name_birthday_idx')
custom_index_name = index.name
AuthorWithIndexedNameAndBirthday._meta.indexes = [index]
with connection.schema_editor() as editor:
editor.add_index(AuthorWithIndexedNameAndBirthday, index)
# Ensure the indexes exist
constraints = self.get_constraints(AuthorWithIndexedNameAndBirthday._meta.db_table)
self.assertIn(custom_index_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name', 'birthday'] and details['index'] and name != custom_index_name
]
self.assertEqual(len(other_constraints), 1)
# Remove index together
index_together = AuthorWithIndexedNameAndBirthday._meta.index_together
with connection.schema_editor() as editor:
editor.alter_index_together(AuthorWithIndexedNameAndBirthday, index_together, [])
constraints = self.get_constraints(AuthorWithIndexedNameAndBirthday._meta.db_table)
self.assertIn(custom_index_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name', 'birthday'] and details['index'] and name != custom_index_name
]
self.assertEqual(len(other_constraints), 0)
# Re-add index together
with connection.schema_editor() as editor:
editor.alter_index_together(AuthorWithIndexedNameAndBirthday, [], index_together)
constraints = self.get_constraints(AuthorWithIndexedNameAndBirthday._meta.db_table)
self.assertIn(custom_index_name, constraints)
other_constraints = [
name for name, details in constraints.items()
if details['columns'] == ['name', 'birthday'] and details['index'] and name != custom_index_name
]
self.assertEqual(len(other_constraints), 1)
# Drop the index
with connection.schema_editor() as editor:
AuthorWithIndexedNameAndBirthday._meta.indexes = []
editor.remove_index(AuthorWithIndexedNameAndBirthday, index)
@isolate_apps('schema')
def test_db_table(self):
"""
Tests renaming of the table
"""
class Author(Model):
name = CharField(max_length=255)
class Meta:
app_label = 'schema'
class Book(Model):
author = ForeignKey(Author, CASCADE)
class Meta:
app_label = 'schema'
# Create the table and one referring it.
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
# Ensure the table is there to begin with
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "CharField")
# Alter the table
with connection.schema_editor(atomic=connection.features.supports_atomic_references_rename) as editor:
editor.alter_db_table(Author, "schema_author", "schema_otherauthor")
# Ensure the table is there afterwards
Author._meta.db_table = "schema_otherauthor"
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "CharField")
# Ensure the foreign key reference was updated
self.assertForeignKeyExists(Book, "author_id", "schema_otherauthor")
# Alter the table again
with connection.schema_editor(atomic=connection.features.supports_atomic_references_rename) as editor:
editor.alter_db_table(Author, "schema_otherauthor", "schema_author")
# Ensure the table is still there
Author._meta.db_table = "schema_author"
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "CharField")
def test_add_remove_index(self):
"""
Tests index addition and removal
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure the table is there and has no index
self.assertNotIn('title', self.get_indexes(Author._meta.db_table))
# Add the index
index = Index(fields=['name'], name='author_title_idx')
with connection.schema_editor() as editor:
editor.add_index(Author, index)
self.assertIn('name', self.get_indexes(Author._meta.db_table))
# Drop the index
with connection.schema_editor() as editor:
editor.remove_index(Author, index)
self.assertNotIn('name', self.get_indexes(Author._meta.db_table))
def test_remove_db_index_doesnt_remove_custom_indexes(self):
"""
Changing db_index to False doesn't remove indexes from Meta.indexes.
"""
with connection.schema_editor() as editor:
editor.create_model(AuthorWithIndexedName)
# Ensure the table has its index
self.assertIn('name', self.get_indexes(AuthorWithIndexedName._meta.db_table))
# Add the custom index
index = Index(fields=['-name'], name='author_name_idx')
author_index_name = index.name
with connection.schema_editor() as editor:
db_index_name = editor._create_index_name(
table_name=AuthorWithIndexedName._meta.db_table,
column_names=('name',),
)
try:
AuthorWithIndexedName._meta.indexes = [index]
with connection.schema_editor() as editor:
editor.add_index(AuthorWithIndexedName, index)
old_constraints = self.get_constraints(AuthorWithIndexedName._meta.db_table)
self.assertIn(author_index_name, old_constraints)
self.assertIn(db_index_name, old_constraints)
# Change name field to db_index=False
old_field = AuthorWithIndexedName._meta.get_field('name')
new_field = CharField(max_length=255)
new_field.set_attributes_from_name('name')
with connection.schema_editor() as editor:
editor.alter_field(AuthorWithIndexedName, old_field, new_field, strict=True)
new_constraints = self.get_constraints(AuthorWithIndexedName._meta.db_table)
self.assertNotIn(db_index_name, new_constraints)
# The index from Meta.indexes is still in the database.
self.assertIn(author_index_name, new_constraints)
# Drop the index
with connection.schema_editor() as editor:
editor.remove_index(AuthorWithIndexedName, index)
finally:
AuthorWithIndexedName._meta.indexes = []
def test_order_index(self):
"""
Indexes defined with ordering (ASC/DESC) defined on column
"""
with connection.schema_editor() as editor:
editor.create_model(Author)
# The table doesn't have an index
self.assertNotIn('title', self.get_indexes(Author._meta.db_table))
index_name = 'author_name_idx'
# Add the index
index = Index(fields=['name', '-weight'], name=index_name)
with connection.schema_editor() as editor:
editor.add_index(Author, index)
if connection.features.supports_index_column_ordering:
self.assertIndexOrder(Author._meta.db_table, index_name, ['ASC', 'DESC'])
# Drop the index
with connection.schema_editor() as editor:
editor.remove_index(Author, index)
def test_indexes(self):
"""
Tests creation/altering of indexes
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
# Ensure the table is there and has the right index
self.assertIn(
"title",
self.get_indexes(Book._meta.db_table),
)
# Alter to remove the index
old_field = Book._meta.get_field("title")
new_field = CharField(max_length=100, db_index=False)
new_field.set_attributes_from_name("title")
with connection.schema_editor() as editor:
editor.alter_field(Book, old_field, new_field, strict=True)
# Ensure the table is there and has no index
self.assertNotIn(
"title",
self.get_indexes(Book._meta.db_table),
)
# Alter to re-add the index
new_field2 = Book._meta.get_field("title")
with connection.schema_editor() as editor:
editor.alter_field(Book, new_field, new_field2, strict=True)
# Ensure the table is there and has the index again
self.assertIn(
"title",
self.get_indexes(Book._meta.db_table),
)
# Add a unique column, verify that creates an implicit index
new_field3 = BookWithSlug._meta.get_field("slug")
with connection.schema_editor() as editor:
editor.add_field(Book, new_field3)
self.assertIn(
"slug",
self.get_uniques(Book._meta.db_table),
)
# Remove the unique, check the index goes with it
new_field4 = CharField(max_length=20, unique=False)
new_field4.set_attributes_from_name("slug")
with connection.schema_editor() as editor:
editor.alter_field(BookWithSlug, new_field3, new_field4, strict=True)
self.assertNotIn(
"slug",
self.get_uniques(Book._meta.db_table),
)
def test_text_field_with_db_index(self):
with connection.schema_editor() as editor:
editor.create_model(AuthorTextFieldWithIndex)
# The text_field index is present if the database supports it.
assertion = self.assertIn if connection.features.supports_index_on_text_field else self.assertNotIn
assertion('text_field', self.get_indexes(AuthorTextFieldWithIndex._meta.db_table))
def test_primary_key(self):
"""
Tests altering of the primary key
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Tag)
# Ensure the table is there and has the right PK
self.assertEqual(self.get_primary_key(Tag._meta.db_table), 'id')
# Alter to change the PK
id_field = Tag._meta.get_field("id")
old_field = Tag._meta.get_field("slug")
new_field = SlugField(primary_key=True)
new_field.set_attributes_from_name("slug")
new_field.model = Tag
with connection.schema_editor() as editor:
editor.remove_field(Tag, id_field)
editor.alter_field(Tag, old_field, new_field)
# Ensure the PK changed
self.assertNotIn(
'id',
self.get_indexes(Tag._meta.db_table),
)
self.assertEqual(self.get_primary_key(Tag._meta.db_table), 'slug')
def test_context_manager_exit(self):
"""
Ensures transaction is correctly closed when an error occurs
inside a SchemaEditor context.
"""
class SomeError(Exception):
pass
try:
with connection.schema_editor():
raise SomeError
except SomeError:
self.assertFalse(connection.in_atomic_block)
@skipIfDBFeature('can_rollback_ddl')
def test_unsupported_transactional_ddl_disallowed(self):
message = (
"Executing DDL statements while in a transaction on databases "
"that can't perform a rollback is prohibited."
)
with atomic(), connection.schema_editor() as editor:
with self.assertRaisesMessage(TransactionManagementError, message):
editor.execute(editor.sql_create_table % {'table': 'foo', 'definition': ''})
@skipUnlessDBFeature('supports_foreign_keys')
def test_foreign_key_index_long_names_regression(self):
"""
Regression test for #21497.
Only affects databases that supports foreign keys.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(AuthorWithEvenLongerName)
editor.create_model(BookWithLongName)
# Find the properly shortened column name
column_name = connection.ops.quote_name("author_foreign_key_with_really_long_field_name_id")
column_name = column_name[1:-1].lower() # unquote, and, for Oracle, un-upcase
# Ensure the table is there and has an index on the column
self.assertIn(
column_name,
self.get_indexes(BookWithLongName._meta.db_table),
)
@skipUnlessDBFeature('supports_foreign_keys')
def test_add_foreign_key_long_names(self):
"""
Regression test for #23009.
Only affects databases that supports foreign keys.
"""
# Create the initial tables
with connection.schema_editor() as editor:
editor.create_model(AuthorWithEvenLongerName)
editor.create_model(BookWithLongName)
# Add a second FK, this would fail due to long ref name before the fix
new_field = ForeignKey(AuthorWithEvenLongerName, CASCADE, related_name="something")
new_field.set_attributes_from_name("author_other_really_long_named_i_mean_so_long_fk")
with connection.schema_editor() as editor:
editor.add_field(BookWithLongName, new_field)
@isolate_apps('schema')
@skipUnlessDBFeature('supports_foreign_keys')
def test_add_foreign_key_quoted_db_table(self):
class Author(Model):
class Meta:
db_table = '"table_author_double_quoted"'
app_label = 'schema'
class Book(Model):
author = ForeignKey(Author, CASCADE)
class Meta:
app_label = 'schema'
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
if connection.vendor == 'mysql':
self.assertForeignKeyExists(Book, 'author_id', '"table_author_double_quoted"')
else:
self.assertForeignKeyExists(Book, 'author_id', 'table_author_double_quoted')
def test_add_foreign_object(self):
with connection.schema_editor() as editor:
editor.create_model(BookForeignObj)
new_field = ForeignObject(Author, on_delete=CASCADE, from_fields=['author_id'], to_fields=['id'])
new_field.set_attributes_from_name('author')
with connection.schema_editor() as editor:
editor.add_field(BookForeignObj, new_field)
def test_creation_deletion_reserved_names(self):
"""
Tries creating a model's table, and then deleting it when it has a
SQL reserved name.
"""
# Create the table
with connection.schema_editor() as editor:
try:
editor.create_model(Thing)
except OperationalError as e:
self.fail("Errors when applying initial migration for a model "
"with a table named after an SQL reserved word: %s" % e)
# The table is there
list(Thing.objects.all())
# Clean up that table
with connection.schema_editor() as editor:
editor.delete_model(Thing)
# The table is gone
with self.assertRaises(DatabaseError):
list(Thing.objects.all())
def test_remove_constraints_capital_letters(self):
"""
#23065 - Constraint names must be quoted if they contain capital letters.
"""
def get_field(*args, field_class=IntegerField, **kwargs):
kwargs['db_column'] = "CamelCase"
field = field_class(*args, **kwargs)
field.set_attributes_from_name("CamelCase")
return field
model = Author
field = get_field()
table = model._meta.db_table
column = field.column
identifier_converter = connection.introspection.identifier_converter
with connection.schema_editor() as editor:
editor.create_model(model)
editor.add_field(model, field)
constraint_name = 'CamelCaseIndex'
expected_constraint_name = identifier_converter(constraint_name)
editor.execute(
editor.sql_create_index % {
"table": editor.quote_name(table),
"name": editor.quote_name(constraint_name),
"using": "",
"columns": editor.quote_name(column),
"extra": "",
"condition": "",
}
)
self.assertIn(expected_constraint_name, self.get_constraints(model._meta.db_table))
editor.alter_field(model, get_field(db_index=True), field, strict=True)
self.assertNotIn(expected_constraint_name, self.get_constraints(model._meta.db_table))
constraint_name = 'CamelCaseUniqConstraint'
expected_constraint_name = identifier_converter(constraint_name)
editor.execute(editor._create_unique_sql(model, [field.column], constraint_name))
self.assertIn(expected_constraint_name, self.get_constraints(model._meta.db_table))
editor.alter_field(model, get_field(unique=True), field, strict=True)
self.assertNotIn(expected_constraint_name, self.get_constraints(model._meta.db_table))
if editor.sql_create_fk:
constraint_name = 'CamelCaseFKConstraint'
expected_constraint_name = identifier_converter(constraint_name)
editor.execute(
editor.sql_create_fk % {
"table": editor.quote_name(table),
"name": editor.quote_name(constraint_name),
"column": editor.quote_name(column),
"to_table": editor.quote_name(table),
"to_column": editor.quote_name(model._meta.auto_field.column),
"deferrable": connection.ops.deferrable_sql(),
}
)
self.assertIn(expected_constraint_name, self.get_constraints(model._meta.db_table))
editor.alter_field(model, get_field(Author, CASCADE, field_class=ForeignKey), field, strict=True)
self.assertNotIn(expected_constraint_name, self.get_constraints(model._meta.db_table))
def test_add_field_use_effective_default(self):
"""
#23987 - effective_default() should be used as the field default when
adding a new field.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure there's no surname field
columns = self.column_classes(Author)
self.assertNotIn("surname", columns)
# Create a row
Author.objects.create(name='Anonymous1')
# Add new CharField to ensure default will be used from effective_default
new_field = CharField(max_length=15, blank=True)
new_field.set_attributes_from_name("surname")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
# Ensure field was added with the right default
with connection.cursor() as cursor:
cursor.execute("SELECT surname FROM schema_author;")
item = cursor.fetchall()[0]
self.assertEqual(item[0], None if connection.features.interprets_empty_strings_as_nulls else '')
def test_add_field_default_dropped(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Ensure there's no surname field
columns = self.column_classes(Author)
self.assertNotIn("surname", columns)
# Create a row
Author.objects.create(name='Anonymous1')
# Add new CharField with a default
new_field = CharField(max_length=15, blank=True, default='surname default')
new_field.set_attributes_from_name("surname")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
# Ensure field was added with the right default
with connection.cursor() as cursor:
cursor.execute("SELECT surname FROM schema_author;")
item = cursor.fetchall()[0]
self.assertEqual(item[0], 'surname default')
# And that the default is no longer set in the database.
field = next(
f for f in connection.introspection.get_table_description(cursor, "schema_author")
if f.name == "surname"
)
if connection.features.can_introspect_default:
self.assertIsNone(field.default)
def test_alter_field_default_dropped(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Create a row
Author.objects.create(name='Anonymous1')
self.assertIsNone(Author.objects.get().height)
old_field = Author._meta.get_field('height')
# The default from the new field is used in updating existing rows.
new_field = IntegerField(blank=True, default=42)
new_field.set_attributes_from_name('height')
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
self.assertEqual(Author.objects.get().height, 42)
# The database default should be removed.
with connection.cursor() as cursor:
field = next(
f for f in connection.introspection.get_table_description(cursor, "schema_author")
if f.name == "height"
)
if connection.features.can_introspect_default:
self.assertIsNone(field.default)
@unittest.skipIf(connection.vendor == 'sqlite', 'SQLite naively remakes the table on field alteration.')
def test_alter_field_default_doesnt_perform_queries(self):
"""
No queries are performed if a field default changes and the field's
not changing from null to non-null.
"""
with connection.schema_editor() as editor:
editor.create_model(AuthorWithDefaultHeight)
old_field = AuthorWithDefaultHeight._meta.get_field('height')
new_default = old_field.default * 2
new_field = PositiveIntegerField(null=True, blank=True, default=new_default)
new_field.set_attributes_from_name('height')
with connection.schema_editor() as editor, self.assertNumQueries(0):
editor.alter_field(AuthorWithDefaultHeight, old_field, new_field, strict=True)
def test_add_textfield_unhashable_default(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Create a row
Author.objects.create(name='Anonymous1')
# Create a field that has an unhashable default
new_field = TextField(default={})
new_field.set_attributes_from_name("info")
with connection.schema_editor() as editor:
editor.add_field(Author, new_field)
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_add_indexed_charfield(self):
field = CharField(max_length=255, db_index=True)
field.set_attributes_from_name('nom_de_plume')
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.add_field(Author, field)
# Should create two indexes; one for like operator.
self.assertEqual(
self.get_constraints_for_column(Author, 'nom_de_plume'),
['schema_author_nom_de_plume_7570a851', 'schema_author_nom_de_plume_7570a851_like'],
)
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_add_unique_charfield(self):
field = CharField(max_length=255, unique=True)
field.set_attributes_from_name('nom_de_plume')
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.add_field(Author, field)
# Should create two indexes; one for like operator.
self.assertEqual(
self.get_constraints_for_column(Author, 'nom_de_plume'),
['schema_author_nom_de_plume_7570a851_like', 'schema_author_nom_de_plume_key']
)
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_alter_field_add_index_to_charfield(self):
# Create the table and verify no initial indexes.
with connection.schema_editor() as editor:
editor.create_model(Author)
self.assertEqual(self.get_constraints_for_column(Author, 'name'), [])
# Alter to add db_index=True and create 2 indexes.
old_field = Author._meta.get_field('name')
new_field = CharField(max_length=255, db_index=True)
new_field.set_attributes_from_name('name')
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
self.assertEqual(
self.get_constraints_for_column(Author, 'name'),
['schema_author_name_1fbc5617', 'schema_author_name_1fbc5617_like']
)
# Remove db_index=True to drop both indexes.
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field, old_field, strict=True)
self.assertEqual(self.get_constraints_for_column(Author, 'name'), [])
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_alter_field_add_unique_to_charfield(self):
# Create the table and verify no initial indexes.
with connection.schema_editor() as editor:
editor.create_model(Author)
self.assertEqual(self.get_constraints_for_column(Author, 'name'), [])
# Alter to add unique=True and create 2 indexes.
old_field = Author._meta.get_field('name')
new_field = CharField(max_length=255, unique=True)
new_field.set_attributes_from_name('name')
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
self.assertEqual(
self.get_constraints_for_column(Author, 'name'),
['schema_author_name_1fbc5617_like', 'schema_author_name_1fbc5617_uniq']
)
# Remove unique=True to drop both indexes.
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field, old_field, strict=True)
self.assertEqual(self.get_constraints_for_column(Author, 'name'), [])
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_alter_field_add_index_to_textfield(self):
# Create the table and verify no initial indexes.
with connection.schema_editor() as editor:
editor.create_model(Note)
self.assertEqual(self.get_constraints_for_column(Note, 'info'), [])
# Alter to add db_index=True and create 2 indexes.
old_field = Note._meta.get_field('info')
new_field = TextField(db_index=True)
new_field.set_attributes_from_name('info')
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field, strict=True)
self.assertEqual(
self.get_constraints_for_column(Note, 'info'),
['schema_note_info_4b0ea695', 'schema_note_info_4b0ea695_like']
)
# Remove db_index=True to drop both indexes.
with connection.schema_editor() as editor:
editor.alter_field(Note, new_field, old_field, strict=True)
self.assertEqual(self.get_constraints_for_column(Note, 'info'), [])
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_alter_field_add_unique_to_charfield_with_db_index(self):
# Create the table and verify initial indexes.
with connection.schema_editor() as editor:
editor.create_model(BookWithoutAuthor)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff', 'schema_book_title_2dfb2dff_like']
)
# Alter to add unique=True (should replace the index)
old_field = BookWithoutAuthor._meta.get_field('title')
new_field = CharField(max_length=100, db_index=True, unique=True)
new_field.set_attributes_from_name('title')
with connection.schema_editor() as editor:
editor.alter_field(BookWithoutAuthor, old_field, new_field, strict=True)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff_like', 'schema_book_title_2dfb2dff_uniq']
)
# Alter to remove unique=True (should drop unique index)
new_field2 = CharField(max_length=100, db_index=True)
new_field2.set_attributes_from_name('title')
with connection.schema_editor() as editor:
editor.alter_field(BookWithoutAuthor, new_field, new_field2, strict=True)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff', 'schema_book_title_2dfb2dff_like']
)
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_alter_field_remove_unique_and_db_index_from_charfield(self):
# Create the table and verify initial indexes.
with connection.schema_editor() as editor:
editor.create_model(BookWithoutAuthor)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff', 'schema_book_title_2dfb2dff_like']
)
# Alter to add unique=True (should replace the index)
old_field = BookWithoutAuthor._meta.get_field('title')
new_field = CharField(max_length=100, db_index=True, unique=True)
new_field.set_attributes_from_name('title')
with connection.schema_editor() as editor:
editor.alter_field(BookWithoutAuthor, old_field, new_field, strict=True)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff_like', 'schema_book_title_2dfb2dff_uniq']
)
# Alter to remove both unique=True and db_index=True (should drop all indexes)
new_field2 = CharField(max_length=100)
new_field2.set_attributes_from_name('title')
with connection.schema_editor() as editor:
editor.alter_field(BookWithoutAuthor, new_field, new_field2, strict=True)
self.assertEqual(self.get_constraints_for_column(BookWithoutAuthor, 'title'), [])
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_alter_field_swap_unique_and_db_index_with_charfield(self):
# Create the table and verify initial indexes.
with connection.schema_editor() as editor:
editor.create_model(BookWithoutAuthor)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff', 'schema_book_title_2dfb2dff_like']
)
# Alter to set unique=True and remove db_index=True (should replace the index)
old_field = BookWithoutAuthor._meta.get_field('title')
new_field = CharField(max_length=100, unique=True)
new_field.set_attributes_from_name('title')
with connection.schema_editor() as editor:
editor.alter_field(BookWithoutAuthor, old_field, new_field, strict=True)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff_like', 'schema_book_title_2dfb2dff_uniq']
)
# Alter to set db_index=True and remove unique=True (should restore index)
new_field2 = CharField(max_length=100, db_index=True)
new_field2.set_attributes_from_name('title')
with connection.schema_editor() as editor:
editor.alter_field(BookWithoutAuthor, new_field, new_field2, strict=True)
self.assertEqual(
self.get_constraints_for_column(BookWithoutAuthor, 'title'),
['schema_book_title_2dfb2dff', 'schema_book_title_2dfb2dff_like']
)
@unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific")
def test_alter_field_add_db_index_to_charfield_with_unique(self):
# Create the table and verify initial indexes.
with connection.schema_editor() as editor:
editor.create_model(Tag)
self.assertEqual(
self.get_constraints_for_column(Tag, 'slug'),
['schema_tag_slug_2c418ba3_like', 'schema_tag_slug_key']
)
# Alter to add db_index=True
old_field = Tag._meta.get_field('slug')
new_field = SlugField(db_index=True, unique=True)
new_field.set_attributes_from_name('slug')
with connection.schema_editor() as editor:
editor.alter_field(Tag, old_field, new_field, strict=True)
self.assertEqual(
self.get_constraints_for_column(Tag, 'slug'),
['schema_tag_slug_2c418ba3_like', 'schema_tag_slug_key']
)
# Alter to remove db_index=True
new_field2 = SlugField(unique=True)
new_field2.set_attributes_from_name('slug')
with connection.schema_editor() as editor:
editor.alter_field(Tag, new_field, new_field2, strict=True)
self.assertEqual(
self.get_constraints_for_column(Tag, 'slug'),
['schema_tag_slug_2c418ba3_like', 'schema_tag_slug_key']
)
def test_alter_field_add_index_to_integerfield(self):
# Create the table and verify no initial indexes.
with connection.schema_editor() as editor:
editor.create_model(Author)
self.assertEqual(self.get_constraints_for_column(Author, 'weight'), [])
# Alter to add db_index=True and create index.
old_field = Author._meta.get_field('weight')
new_field = IntegerField(null=True, db_index=True)
new_field.set_attributes_from_name('weight')
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field, strict=True)
self.assertEqual(self.get_constraints_for_column(Author, 'weight'), ['schema_author_weight_587740f9'])
# Remove db_index=True to drop index.
with connection.schema_editor() as editor:
editor.alter_field(Author, new_field, old_field, strict=True)
self.assertEqual(self.get_constraints_for_column(Author, 'weight'), [])
def test_alter_pk_with_self_referential_field(self):
"""
Changing the primary key field name of a model with a self-referential
foreign key (#26384).
"""
with connection.schema_editor() as editor:
editor.create_model(Node)
old_field = Node._meta.get_field('node_id')
new_field = AutoField(primary_key=True)
new_field.set_attributes_from_name('id')
with connection.schema_editor() as editor:
editor.alter_field(Node, old_field, new_field, strict=True)
self.assertForeignKeyExists(Node, 'parent_id', Node._meta.db_table)
@mock.patch('django.db.backends.base.schema.datetime')
@mock.patch('django.db.backends.base.schema.timezone')
def test_add_datefield_and_datetimefield_use_effective_default(self, mocked_datetime, mocked_tz):
"""
effective_default() should be used for DateField, DateTimeField, and
TimeField if auto_now or auto_add_now is set (#25005).
"""
now = datetime.datetime(month=1, day=1, year=2000, hour=1, minute=1)
now_tz = datetime.datetime(month=1, day=1, year=2000, hour=1, minute=1, tzinfo=timezone.utc)
mocked_datetime.now = mock.MagicMock(return_value=now)
mocked_tz.now = mock.MagicMock(return_value=now_tz)
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Check auto_now/auto_now_add attributes are not defined
columns = self.column_classes(Author)
self.assertNotIn("dob_auto_now", columns)
self.assertNotIn("dob_auto_now_add", columns)
self.assertNotIn("dtob_auto_now", columns)
self.assertNotIn("dtob_auto_now_add", columns)
self.assertNotIn("tob_auto_now", columns)
self.assertNotIn("tob_auto_now_add", columns)
# Create a row
Author.objects.create(name='Anonymous1')
# Ensure fields were added with the correct defaults
dob_auto_now = DateField(auto_now=True)
dob_auto_now.set_attributes_from_name('dob_auto_now')
self.check_added_field_default(
editor, Author, dob_auto_now, 'dob_auto_now', now.date(),
cast_function=lambda x: x.date(),
)
dob_auto_now_add = DateField(auto_now_add=True)
dob_auto_now_add.set_attributes_from_name('dob_auto_now_add')
self.check_added_field_default(
editor, Author, dob_auto_now_add, 'dob_auto_now_add', now.date(),
cast_function=lambda x: x.date(),
)
dtob_auto_now = DateTimeField(auto_now=True)
dtob_auto_now.set_attributes_from_name('dtob_auto_now')
self.check_added_field_default(
editor, Author, dtob_auto_now, 'dtob_auto_now', now,
)
dt_tm_of_birth_auto_now_add = DateTimeField(auto_now_add=True)
dt_tm_of_birth_auto_now_add.set_attributes_from_name('dtob_auto_now_add')
self.check_added_field_default(
editor, Author, dt_tm_of_birth_auto_now_add, 'dtob_auto_now_add', now,
)
tob_auto_now = TimeField(auto_now=True)
tob_auto_now.set_attributes_from_name('tob_auto_now')
self.check_added_field_default(
editor, Author, tob_auto_now, 'tob_auto_now', now.time(),
cast_function=lambda x: x.time(),
)
tob_auto_now_add = TimeField(auto_now_add=True)
tob_auto_now_add.set_attributes_from_name('tob_auto_now_add')
self.check_added_field_default(
editor, Author, tob_auto_now_add, 'tob_auto_now_add', now.time(),
cast_function=lambda x: x.time(),
)
def test_namespaced_db_table_create_index_name(self):
"""
Table names are stripped of their namespace/schema before being used to
generate index names.
"""
with connection.schema_editor() as editor:
max_name_length = connection.ops.max_name_length() or 200
namespace = 'n' * max_name_length
table_name = 't' * max_name_length
namespaced_table_name = '"%s"."%s"' % (namespace, table_name)
self.assertEqual(
editor._create_index_name(table_name, []),
editor._create_index_name(namespaced_table_name, []),
)
@unittest.skipUnless(connection.vendor == 'oracle', 'Oracle specific db_table syntax')
def test_creation_with_db_table_double_quotes(self):
oracle_user = connection.creation._test_database_user()
class Student(Model):
name = CharField(max_length=30)
class Meta:
app_label = 'schema'
apps = new_apps
db_table = '"%s"."DJANGO_STUDENT_TABLE"' % oracle_user
class Document(Model):
name = CharField(max_length=30)
students = ManyToManyField(Student)
class Meta:
app_label = 'schema'
apps = new_apps
db_table = '"%s"."DJANGO_DOCUMENT_TABLE"' % oracle_user
self.local_models = [Student, Document]
with connection.schema_editor() as editor:
editor.create_model(Student)
editor.create_model(Document)
doc = Document.objects.create(name='Test Name')
student = Student.objects.create(name='Some man')
doc.students.add(student)
def test_rename_table_renames_deferred_sql_references(self):
atomic_rename = connection.features.supports_atomic_references_rename
with connection.schema_editor(atomic=atomic_rename) as editor:
editor.create_model(Author)
editor.create_model(Book)
editor.alter_db_table(Author, 'schema_author', 'schema_renamed_author')
editor.alter_db_table(Author, 'schema_book', 'schema_renamed_book')
self.assertGreater(len(editor.deferred_sql), 0)
for statement in editor.deferred_sql:
self.assertIs(statement.references_table('schema_author'), False)
self.assertIs(statement.references_table('schema_book'), False)
@unittest.skipIf(connection.vendor == 'sqlite', 'SQLite naively remakes the table on field alteration.')
def test_rename_column_renames_deferred_sql_references(self):
with connection.schema_editor() as editor:
editor.create_model(Author)
editor.create_model(Book)
old_title = Book._meta.get_field('title')
new_title = CharField(max_length=100, db_index=True)
new_title.set_attributes_from_name('renamed_title')
editor.alter_field(Book, old_title, new_title)
old_author = Book._meta.get_field('author')
new_author = ForeignKey(Author, CASCADE)
new_author.set_attributes_from_name('renamed_author')
editor.alter_field(Book, old_author, new_author)
self.assertGreater(len(editor.deferred_sql), 0)
for statement in editor.deferred_sql:
self.assertIs(statement.references_column('book', 'title'), False)
self.assertIs(statement.references_column('book', 'author_id'), False)
@isolate_apps('schema')
def test_referenced_field_without_constraint_rename_inside_atomic_block(self):
"""
Foreign keys without database level constraint don't prevent the field
they reference from being renamed in an atomic block.
"""
class Foo(Model):
field = CharField(max_length=255, unique=True)
class Meta:
app_label = 'schema'
class Bar(Model):
foo = ForeignKey(Foo, CASCADE, to_field='field', db_constraint=False)
class Meta:
app_label = 'schema'
self.isolated_local_models = [Foo, Bar]
with connection.schema_editor() as editor:
editor.create_model(Foo)
editor.create_model(Bar)
new_field = CharField(max_length=255, unique=True)
new_field.set_attributes_from_name('renamed')
with connection.schema_editor(atomic=True) as editor:
editor.alter_field(Foo, Foo._meta.get_field('field'), new_field)
@isolate_apps('schema')
def test_referenced_table_without_constraint_rename_inside_atomic_block(self):
"""
Foreign keys without database level constraint don't prevent the table
they reference from being renamed in an atomic block.
"""
class Foo(Model):
field = CharField(max_length=255, unique=True)
class Meta:
app_label = 'schema'
class Bar(Model):
foo = ForeignKey(Foo, CASCADE, to_field='field', db_constraint=False)
class Meta:
app_label = 'schema'
self.isolated_local_models = [Foo, Bar]
with connection.schema_editor() as editor:
editor.create_model(Foo)
editor.create_model(Bar)
new_field = CharField(max_length=255, unique=True)
new_field.set_attributes_from_name('renamed')
with connection.schema_editor(atomic=True) as editor:
editor.alter_db_table(Foo, Foo._meta.db_table, 'renamed_table')
Foo._meta.db_table = 'renamed_table'
|
18ac1100b225dad1d90b4307a6c92fb45992ccf99fab18d3b720b65d3326129a | from django.db import models
class Classification(models.Model):
code = models.CharField(max_length=10)
class Employee(models.Model):
name = models.CharField(max_length=40, blank=False, null=False)
salary = models.PositiveIntegerField()
department = models.CharField(max_length=40, blank=False, null=False)
hire_date = models.DateField(blank=False, null=False)
age = models.IntegerField(blank=False, null=False)
classification = models.ForeignKey('Classification', on_delete=models.CASCADE, null=True)
def __str__(self):
return '{}, {}, {}, {}'.format(self.name, self.department, self.salary, self.hire_date)
|
0d659c0e776649b28fca9da85f888fe94d9ded142f6f754605ff71a60b79f136 | """
Specifying ordering
Specify default ordering for a model using the ``ordering`` attribute, which
should be a list or tuple of field names. This tells Django how to order
``QuerySet`` results.
If a field name in ``ordering`` starts with a hyphen, that field will be
ordered in descending order. Otherwise, it'll be ordered in ascending order.
The special-case field name ``"?"`` specifies random order.
The ordering attribute is not required. If you leave it off, ordering will be
undefined -- not random, just undefined.
"""
from django.db import models
class Author(models.Model):
name = models.CharField(max_length=63, null=True, blank=True)
class Meta:
ordering = ('-pk',)
class Article(models.Model):
author = models.ForeignKey(Author, models.SET_NULL, null=True)
second_author = models.ForeignKey(Author, models.SET_NULL, null=True, related_name='+')
headline = models.CharField(max_length=100)
pub_date = models.DateTimeField()
class Meta:
ordering = (
'-pub_date',
models.F('headline'),
models.F('author__name').asc(),
models.OrderBy(models.F('second_author__name')),
)
def __str__(self):
return self.headline
class OrderedByAuthorArticle(Article):
class Meta:
proxy = True
ordering = ('author', 'second_author')
class OrderedByFArticle(Article):
class Meta:
proxy = True
ordering = (models.F('author').asc(nulls_first=True), 'id')
class ChildArticle(Article):
pass
class Reference(models.Model):
article = models.ForeignKey(OrderedByAuthorArticle, models.CASCADE)
class Meta:
ordering = ('article',)
|
54f4109b787200f9d886520b6e8ff6ebaa217df5eacf532f8ec0c6cad5d209ff | from math import ceil
from django.db import connection, models
from django.db.models import ProtectedError, RestrictedError
from django.db.models.deletion import Collector
from django.db.models.sql.constants import GET_ITERATOR_CHUNK_SIZE
from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
from .models import (
B1, B2, B3, MR, A, Avatar, B, Base, Child, DeleteBottom, DeleteTop,
GenericB1, GenericB2, GenericDeleteBottom, HiddenUser, HiddenUserProfile,
M, M2MFrom, M2MTo, MRNull, Origin, P, Parent, R, RChild, RChildChild,
Referrer, S, T, User, create_a, get_default_r,
)
class OnDeleteTests(TestCase):
def setUp(self):
self.DEFAULT = get_default_r()
def test_auto(self):
a = create_a('auto')
a.auto.delete()
self.assertFalse(A.objects.filter(name='auto').exists())
def test_non_callable(self):
msg = 'on_delete must be callable.'
with self.assertRaisesMessage(TypeError, msg):
models.ForeignKey('self', on_delete=None)
with self.assertRaisesMessage(TypeError, msg):
models.OneToOneField('self', on_delete=None)
def test_auto_nullable(self):
a = create_a('auto_nullable')
a.auto_nullable.delete()
self.assertFalse(A.objects.filter(name='auto_nullable').exists())
def test_setvalue(self):
a = create_a('setvalue')
a.setvalue.delete()
a = A.objects.get(pk=a.pk)
self.assertEqual(self.DEFAULT, a.setvalue.pk)
def test_setnull(self):
a = create_a('setnull')
a.setnull.delete()
a = A.objects.get(pk=a.pk)
self.assertIsNone(a.setnull)
def test_setdefault(self):
a = create_a('setdefault')
a.setdefault.delete()
a = A.objects.get(pk=a.pk)
self.assertEqual(self.DEFAULT, a.setdefault.pk)
def test_setdefault_none(self):
a = create_a('setdefault_none')
a.setdefault_none.delete()
a = A.objects.get(pk=a.pk)
self.assertIsNone(a.setdefault_none)
def test_cascade(self):
a = create_a('cascade')
a.cascade.delete()
self.assertFalse(A.objects.filter(name='cascade').exists())
def test_cascade_nullable(self):
a = create_a('cascade_nullable')
a.cascade_nullable.delete()
self.assertFalse(A.objects.filter(name='cascade_nullable').exists())
def test_protect(self):
a = create_a('protect')
msg = (
"Cannot delete some instances of model 'R' because they are "
"referenced through protected foreign keys: 'A.protect'."
)
with self.assertRaisesMessage(ProtectedError, msg):
a.protect.delete()
def test_protect_multiple(self):
a = create_a('protect')
B.objects.create(protect=a.protect)
msg = (
"Cannot delete some instances of model 'R' because they are "
"referenced through protected foreign keys: 'A.protect', "
"'B.protect'."
)
with self.assertRaisesMessage(ProtectedError, msg):
a.protect.delete()
def test_protect_path(self):
a = create_a('protect')
a.protect.p = P.objects.create()
a.protect.save()
msg = (
"Cannot delete some instances of model 'P' because they are "
"referenced through protected foreign keys: 'R.p'."
)
with self.assertRaisesMessage(ProtectedError, msg):
a.protect.p.delete()
def test_do_nothing(self):
# Testing DO_NOTHING is a bit harder: It would raise IntegrityError for a normal model,
# so we connect to pre_delete and set the fk to a known value.
replacement_r = R.objects.create()
def check_do_nothing(sender, **kwargs):
obj = kwargs['instance']
obj.donothing_set.update(donothing=replacement_r)
models.signals.pre_delete.connect(check_do_nothing)
a = create_a('do_nothing')
a.donothing.delete()
a = A.objects.get(pk=a.pk)
self.assertEqual(replacement_r, a.donothing)
models.signals.pre_delete.disconnect(check_do_nothing)
def test_do_nothing_qscount(self):
"""
A models.DO_NOTHING relation doesn't trigger a query.
"""
b = Base.objects.create()
with self.assertNumQueries(1):
# RelToBase should not be queried.
b.delete()
self.assertEqual(Base.objects.count(), 0)
def test_inheritance_cascade_up(self):
child = RChild.objects.create()
child.delete()
self.assertFalse(R.objects.filter(pk=child.pk).exists())
def test_inheritance_cascade_down(self):
child = RChild.objects.create()
parent = child.r_ptr
parent.delete()
self.assertFalse(RChild.objects.filter(pk=child.pk).exists())
def test_cascade_from_child(self):
a = create_a('child')
a.child.delete()
self.assertFalse(A.objects.filter(name='child').exists())
self.assertFalse(R.objects.filter(pk=a.child_id).exists())
def test_cascade_from_parent(self):
a = create_a('child')
R.objects.get(pk=a.child_id).delete()
self.assertFalse(A.objects.filter(name='child').exists())
self.assertFalse(RChild.objects.filter(pk=a.child_id).exists())
def test_setnull_from_child(self):
a = create_a('child_setnull')
a.child_setnull.delete()
self.assertFalse(R.objects.filter(pk=a.child_setnull_id).exists())
a = A.objects.get(pk=a.pk)
self.assertIsNone(a.child_setnull)
def test_setnull_from_parent(self):
a = create_a('child_setnull')
R.objects.get(pk=a.child_setnull_id).delete()
self.assertFalse(RChild.objects.filter(pk=a.child_setnull_id).exists())
a = A.objects.get(pk=a.pk)
self.assertIsNone(a.child_setnull)
def test_o2o_setnull(self):
a = create_a('o2o_setnull')
a.o2o_setnull.delete()
a = A.objects.get(pk=a.pk)
self.assertIsNone(a.o2o_setnull)
def test_restrict(self):
a = create_a('restrict')
msg = (
"Cannot delete some instances of model 'R' because they are "
"referenced through restricted foreign keys: 'A.restrict'."
)
with self.assertRaisesMessage(RestrictedError, msg):
a.restrict.delete()
def test_restrict_multiple(self):
a = create_a('restrict')
B3.objects.create(restrict=a.restrict)
msg = (
"Cannot delete some instances of model 'R' because they are "
"referenced through restricted foreign keys: 'A.restrict', "
"'B3.restrict'."
)
with self.assertRaisesMessage(RestrictedError, msg):
a.restrict.delete()
def test_restrict_path_cascade_indirect(self):
a = create_a('restrict')
a.restrict.p = P.objects.create()
a.restrict.save()
msg = (
"Cannot delete some instances of model 'P' because they are "
"referenced through restricted foreign keys: 'A.restrict'."
)
with self.assertRaisesMessage(RestrictedError, msg):
a.restrict.p.delete()
# Object referenced also with CASCADE relationship can be deleted.
a.cascade.p = a.restrict.p
a.cascade.save()
a.restrict.p.delete()
self.assertFalse(A.objects.filter(name='restrict').exists())
self.assertFalse(R.objects.filter(pk=a.restrict_id).exists())
def test_restrict_path_cascade_direct(self):
a = create_a('restrict')
a.restrict.p = P.objects.create()
a.restrict.save()
a.cascade_p = a.restrict.p
a.save()
a.restrict.p.delete()
self.assertFalse(A.objects.filter(name='restrict').exists())
self.assertFalse(R.objects.filter(pk=a.restrict_id).exists())
def test_restrict_path_cascade_indirect_diamond(self):
delete_top = DeleteTop.objects.create()
b1 = B1.objects.create(delete_top=delete_top)
b2 = B2.objects.create(delete_top=delete_top)
DeleteBottom.objects.create(b1=b1, b2=b2)
msg = (
"Cannot delete some instances of model 'B1' because they are "
"referenced through restricted foreign keys: 'DeleteBottom.b1'."
)
with self.assertRaisesMessage(RestrictedError, msg):
b1.delete()
self.assertTrue(DeleteTop.objects.exists())
self.assertTrue(B1.objects.exists())
self.assertTrue(B2.objects.exists())
self.assertTrue(DeleteBottom.objects.exists())
# Object referenced also with CASCADE relationship can be deleted.
delete_top.delete()
self.assertFalse(DeleteTop.objects.exists())
self.assertFalse(B1.objects.exists())
self.assertFalse(B2.objects.exists())
self.assertFalse(DeleteBottom.objects.exists())
def test_restrict_gfk_no_fast_delete(self):
delete_top = DeleteTop.objects.create()
generic_b1 = GenericB1.objects.create(generic_delete_top=delete_top)
generic_b2 = GenericB2.objects.create(generic_delete_top=delete_top)
GenericDeleteBottom.objects.create(generic_b1=generic_b1, generic_b2=generic_b2)
msg = (
"Cannot delete some instances of model 'GenericB1' because they "
"are referenced through restricted foreign keys: "
"'GenericDeleteBottom.generic_b1'."
)
with self.assertRaisesMessage(RestrictedError, msg):
generic_b1.delete()
self.assertTrue(DeleteTop.objects.exists())
self.assertTrue(GenericB1.objects.exists())
self.assertTrue(GenericB2.objects.exists())
self.assertTrue(GenericDeleteBottom.objects.exists())
# Object referenced also with CASCADE relationship can be deleted.
delete_top.delete()
self.assertFalse(DeleteTop.objects.exists())
self.assertFalse(GenericB1.objects.exists())
self.assertFalse(GenericB2.objects.exists())
self.assertFalse(GenericDeleteBottom.objects.exists())
class DeletionTests(TestCase):
def test_m2m(self):
m = M.objects.create()
r = R.objects.create()
MR.objects.create(m=m, r=r)
r.delete()
self.assertFalse(MR.objects.exists())
r = R.objects.create()
MR.objects.create(m=m, r=r)
m.delete()
self.assertFalse(MR.objects.exists())
m = M.objects.create()
r = R.objects.create()
m.m2m.add(r)
r.delete()
through = M._meta.get_field('m2m').remote_field.through
self.assertFalse(through.objects.exists())
r = R.objects.create()
m.m2m.add(r)
m.delete()
self.assertFalse(through.objects.exists())
m = M.objects.create()
r = R.objects.create()
MRNull.objects.create(m=m, r=r)
r.delete()
self.assertFalse(not MRNull.objects.exists())
self.assertFalse(m.m2m_through_null.exists())
def test_bulk(self):
s = S.objects.create(r=R.objects.create())
for i in range(2 * GET_ITERATOR_CHUNK_SIZE):
T.objects.create(s=s)
# 1 (select related `T` instances)
# + 1 (select related `U` instances)
# + 2 (delete `T` instances in batches)
# + 1 (delete `s`)
self.assertNumQueries(5, s.delete)
self.assertFalse(S.objects.exists())
def test_instance_update(self):
deleted = []
related_setnull_sets = []
def pre_delete(sender, **kwargs):
obj = kwargs['instance']
deleted.append(obj)
if isinstance(obj, R):
related_setnull_sets.append([a.pk for a in obj.setnull_set.all()])
models.signals.pre_delete.connect(pre_delete)
a = create_a('update_setnull')
a.setnull.delete()
a = create_a('update_cascade')
a.cascade.delete()
for obj in deleted:
self.assertIsNone(obj.pk)
for pk_list in related_setnull_sets:
for a in A.objects.filter(id__in=pk_list):
self.assertIsNone(a.setnull)
models.signals.pre_delete.disconnect(pre_delete)
def test_deletion_order(self):
pre_delete_order = []
post_delete_order = []
def log_post_delete(sender, **kwargs):
pre_delete_order.append((sender, kwargs['instance'].pk))
def log_pre_delete(sender, **kwargs):
post_delete_order.append((sender, kwargs['instance'].pk))
models.signals.post_delete.connect(log_post_delete)
models.signals.pre_delete.connect(log_pre_delete)
r = R.objects.create(pk=1)
s1 = S.objects.create(pk=1, r=r)
s2 = S.objects.create(pk=2, r=r)
T.objects.create(pk=1, s=s1)
T.objects.create(pk=2, s=s2)
RChild.objects.create(r_ptr=r)
r.delete()
self.assertEqual(
pre_delete_order, [(T, 2), (T, 1), (RChild, 1), (S, 2), (S, 1), (R, 1)]
)
self.assertEqual(
post_delete_order, [(T, 1), (T, 2), (RChild, 1), (S, 1), (S, 2), (R, 1)]
)
models.signals.post_delete.disconnect(log_post_delete)
models.signals.pre_delete.disconnect(log_pre_delete)
def test_relational_post_delete_signals_happen_before_parent_object(self):
deletions = []
def log_post_delete(instance, **kwargs):
self.assertTrue(R.objects.filter(pk=instance.r_id))
self.assertIs(type(instance), S)
deletions.append(instance.id)
r = R.objects.create(pk=1)
S.objects.create(pk=1, r=r)
models.signals.post_delete.connect(log_post_delete, sender=S)
try:
r.delete()
finally:
models.signals.post_delete.disconnect(log_post_delete)
self.assertEqual(len(deletions), 1)
self.assertEqual(deletions[0], 1)
@skipUnlessDBFeature("can_defer_constraint_checks")
def test_can_defer_constraint_checks(self):
u = User.objects.create(
avatar=Avatar.objects.create()
)
a = Avatar.objects.get(pk=u.avatar_id)
# 1 query to find the users for the avatar.
# 1 query to delete the user
# 1 query to delete the avatar
# The important thing is that when we can defer constraint checks there
# is no need to do an UPDATE on User.avatar to null it out.
# Attach a signal to make sure we will not do fast_deletes.
calls = []
def noop(*args, **kwargs):
calls.append('')
models.signals.post_delete.connect(noop, sender=User)
self.assertNumQueries(3, a.delete)
self.assertFalse(User.objects.exists())
self.assertFalse(Avatar.objects.exists())
self.assertEqual(len(calls), 1)
models.signals.post_delete.disconnect(noop, sender=User)
@skipIfDBFeature("can_defer_constraint_checks")
def test_cannot_defer_constraint_checks(self):
u = User.objects.create(
avatar=Avatar.objects.create()
)
# Attach a signal to make sure we will not do fast_deletes.
calls = []
def noop(*args, **kwargs):
calls.append('')
models.signals.post_delete.connect(noop, sender=User)
a = Avatar.objects.get(pk=u.avatar_id)
# The below doesn't make sense... Why do we need to null out
# user.avatar if we are going to delete the user immediately after it,
# and there are no more cascades.
# 1 query to find the users for the avatar.
# 1 query to delete the user
# 1 query to null out user.avatar, because we can't defer the constraint
# 1 query to delete the avatar
self.assertNumQueries(4, a.delete)
self.assertFalse(User.objects.exists())
self.assertFalse(Avatar.objects.exists())
self.assertEqual(len(calls), 1)
models.signals.post_delete.disconnect(noop, sender=User)
def test_hidden_related(self):
r = R.objects.create()
h = HiddenUser.objects.create(r=r)
HiddenUserProfile.objects.create(user=h)
r.delete()
self.assertEqual(HiddenUserProfile.objects.count(), 0)
def test_large_delete(self):
TEST_SIZE = 2000
objs = [Avatar() for i in range(0, TEST_SIZE)]
Avatar.objects.bulk_create(objs)
# Calculate the number of queries needed.
batch_size = connection.ops.bulk_batch_size(['pk'], objs)
# The related fetches are done in batches.
batches = ceil(len(objs) / batch_size)
# One query for Avatar.objects.all() and then one related fast delete for
# each batch.
fetches_to_mem = 1 + batches
# The Avatar objects are going to be deleted in batches of GET_ITERATOR_CHUNK_SIZE
queries = fetches_to_mem + TEST_SIZE // GET_ITERATOR_CHUNK_SIZE
self.assertNumQueries(queries, Avatar.objects.all().delete)
self.assertFalse(Avatar.objects.exists())
def test_large_delete_related(self):
TEST_SIZE = 2000
s = S.objects.create(r=R.objects.create())
for i in range(TEST_SIZE):
T.objects.create(s=s)
batch_size = max(connection.ops.bulk_batch_size(['pk'], range(TEST_SIZE)), 1)
# TEST_SIZE / batch_size (select related `T` instances)
# + 1 (select related `U` instances)
# + TEST_SIZE / GET_ITERATOR_CHUNK_SIZE (delete `T` instances in batches)
# + 1 (delete `s`)
expected_num_queries = ceil(TEST_SIZE / batch_size)
expected_num_queries += ceil(TEST_SIZE / GET_ITERATOR_CHUNK_SIZE) + 2
self.assertNumQueries(expected_num_queries, s.delete)
self.assertFalse(S.objects.exists())
self.assertFalse(T.objects.exists())
def test_delete_with_keeping_parents(self):
child = RChild.objects.create()
parent_id = child.r_ptr_id
child.delete(keep_parents=True)
self.assertFalse(RChild.objects.filter(id=child.id).exists())
self.assertTrue(R.objects.filter(id=parent_id).exists())
def test_delete_with_keeping_parents_relationships(self):
child = RChild.objects.create()
parent_id = child.r_ptr_id
parent_referent_id = S.objects.create(r=child.r_ptr).pk
child.delete(keep_parents=True)
self.assertFalse(RChild.objects.filter(id=child.id).exists())
self.assertTrue(R.objects.filter(id=parent_id).exists())
self.assertTrue(S.objects.filter(pk=parent_referent_id).exists())
childchild = RChildChild.objects.create()
parent_id = childchild.rchild_ptr.r_ptr_id
child_id = childchild.rchild_ptr_id
parent_referent_id = S.objects.create(r=childchild.rchild_ptr.r_ptr).pk
childchild.delete(keep_parents=True)
self.assertFalse(RChildChild.objects.filter(id=childchild.id).exists())
self.assertTrue(RChild.objects.filter(id=child_id).exists())
self.assertTrue(R.objects.filter(id=parent_id).exists())
self.assertTrue(S.objects.filter(pk=parent_referent_id).exists())
def test_queryset_delete_returns_num_rows(self):
"""
QuerySet.delete() should return the number of deleted rows and a
dictionary with the number of deletions for each object type.
"""
Avatar.objects.bulk_create([Avatar(desc='a'), Avatar(desc='b'), Avatar(desc='c')])
avatars_count = Avatar.objects.count()
deleted, rows_count = Avatar.objects.all().delete()
self.assertEqual(deleted, avatars_count)
# more complex example with multiple object types
r = R.objects.create()
h1 = HiddenUser.objects.create(r=r)
HiddenUser.objects.create(r=r)
HiddenUserProfile.objects.create(user=h1)
existed_objs = {
R._meta.label: R.objects.count(),
HiddenUser._meta.label: HiddenUser.objects.count(),
A._meta.label: A.objects.count(),
MR._meta.label: MR.objects.count(),
HiddenUserProfile._meta.label: HiddenUserProfile.objects.count(),
}
deleted, deleted_objs = R.objects.all().delete()
for k, v in existed_objs.items():
self.assertEqual(deleted_objs[k], v)
def test_model_delete_returns_num_rows(self):
"""
Model.delete() should return the number of deleted rows and a
dictionary with the number of deletions for each object type.
"""
r = R.objects.create()
h1 = HiddenUser.objects.create(r=r)
h2 = HiddenUser.objects.create(r=r)
HiddenUser.objects.create(r=r)
HiddenUserProfile.objects.create(user=h1)
HiddenUserProfile.objects.create(user=h2)
m1 = M.objects.create()
m2 = M.objects.create()
MR.objects.create(r=r, m=m1)
r.m_set.add(m1)
r.m_set.add(m2)
r.save()
existed_objs = {
R._meta.label: R.objects.count(),
HiddenUser._meta.label: HiddenUser.objects.count(),
A._meta.label: A.objects.count(),
MR._meta.label: MR.objects.count(),
HiddenUserProfile._meta.label: HiddenUserProfile.objects.count(),
M.m2m.through._meta.label: M.m2m.through.objects.count(),
}
deleted, deleted_objs = r.delete()
self.assertEqual(deleted, sum(existed_objs.values()))
for k, v in existed_objs.items():
self.assertEqual(deleted_objs[k], v)
def test_proxied_model_duplicate_queries(self):
"""
#25685 - Deleting instances of a model with existing proxy
classes should not issue multiple queries during cascade
deletion of referring models.
"""
avatar = Avatar.objects.create()
# One query for the Avatar table and a second for the User one.
with self.assertNumQueries(2):
avatar.delete()
def test_only_referenced_fields_selected(self):
"""
Only referenced fields are selected during cascade deletion SELECT
unless deletion signals are connected.
"""
origin = Origin.objects.create()
expected_sql = str(
Referrer.objects.only(
# Both fields are referenced by SecondReferrer.
'id', 'unique_field',
).filter(origin__in=[origin]).query
)
with self.assertNumQueries(2) as ctx:
origin.delete()
self.assertEqual(ctx.captured_queries[0]['sql'], expected_sql)
def receiver(instance, **kwargs):
pass
# All fields are selected if deletion signals are connected.
for signal_name in ('pre_delete', 'post_delete'):
with self.subTest(signal=signal_name):
origin = Origin.objects.create()
signal = getattr(models.signals, signal_name)
signal.connect(receiver, sender=Referrer)
with self.assertNumQueries(2) as ctx:
origin.delete()
self.assertIn(
connection.ops.quote_name('large_field'),
ctx.captured_queries[0]['sql'],
)
signal.disconnect(receiver, sender=Referrer)
class FastDeleteTests(TestCase):
def test_fast_delete_fk(self):
u = User.objects.create(
avatar=Avatar.objects.create()
)
a = Avatar.objects.get(pk=u.avatar_id)
# 1 query to fast-delete the user
# 1 query to delete the avatar
self.assertNumQueries(2, a.delete)
self.assertFalse(User.objects.exists())
self.assertFalse(Avatar.objects.exists())
def test_fast_delete_m2m(self):
t = M2MTo.objects.create()
f = M2MFrom.objects.create()
f.m2m.add(t)
# 1 to delete f, 1 to fast-delete m2m for f
self.assertNumQueries(2, f.delete)
def test_fast_delete_revm2m(self):
t = M2MTo.objects.create()
f = M2MFrom.objects.create()
f.m2m.add(t)
# 1 to delete t, 1 to fast-delete t's m_set
self.assertNumQueries(2, f.delete)
def test_fast_delete_qs(self):
u1 = User.objects.create()
u2 = User.objects.create()
self.assertNumQueries(1, User.objects.filter(pk=u1.pk).delete)
self.assertEqual(User.objects.count(), 1)
self.assertTrue(User.objects.filter(pk=u2.pk).exists())
def test_fast_delete_instance_set_pk_none(self):
u = User.objects.create()
# User can be fast-deleted.
collector = Collector(using='default')
self.assertTrue(collector.can_fast_delete(u))
u.delete()
self.assertIsNone(u.pk)
def test_fast_delete_joined_qs(self):
a = Avatar.objects.create(desc='a')
User.objects.create(avatar=a)
u2 = User.objects.create()
self.assertNumQueries(1, User.objects.filter(avatar__desc='a').delete)
self.assertEqual(User.objects.count(), 1)
self.assertTrue(User.objects.filter(pk=u2.pk).exists())
def test_fast_delete_inheritance(self):
c = Child.objects.create()
p = Parent.objects.create()
# 1 for self, 1 for parent
self.assertNumQueries(2, c.delete)
self.assertFalse(Child.objects.exists())
self.assertEqual(Parent.objects.count(), 1)
self.assertEqual(Parent.objects.filter(pk=p.pk).count(), 1)
# 1 for self delete, 1 for fast delete of empty "child" qs.
self.assertNumQueries(2, p.delete)
self.assertFalse(Parent.objects.exists())
# 1 for self delete, 1 for fast delete of empty "child" qs.
c = Child.objects.create()
p = c.parent_ptr
self.assertNumQueries(2, p.delete)
self.assertFalse(Parent.objects.exists())
self.assertFalse(Child.objects.exists())
def test_fast_delete_large_batch(self):
User.objects.bulk_create(User() for i in range(0, 2000))
# No problems here - we aren't going to cascade, so we will fast
# delete the objects in a single query.
self.assertNumQueries(1, User.objects.all().delete)
a = Avatar.objects.create(desc='a')
User.objects.bulk_create(User(avatar=a) for i in range(0, 2000))
# We don't hit parameter amount limits for a, so just one query for
# that + fast delete of the related objs.
self.assertNumQueries(2, a.delete)
self.assertEqual(User.objects.count(), 0)
def test_fast_delete_empty_no_update_can_self_select(self):
"""
#25932 - Fast deleting on backends that don't have the
`no_update_can_self_select` feature should work even if the specified
filter doesn't match any row.
"""
with self.assertNumQueries(1):
self.assertEqual(
User.objects.filter(avatar__desc='missing').delete(),
(0, {'delete.User': 0})
)
def test_fast_delete_combined_relationships(self):
# The cascading fast-delete of SecondReferrer should be combined
# in a single DELETE WHERE referrer_id OR unique_field.
origin = Origin.objects.create()
referer = Referrer.objects.create(origin=origin, unique_field=42)
with self.assertNumQueries(2):
referer.delete()
|
a89bce54c6626c7e41d9499e5cfb1596f7ea1e326728ac38d4b1c11103a43ab4 | from django.contrib.contenttypes.fields import (
GenericForeignKey, GenericRelation,
)
from django.contrib.contenttypes.models import ContentType
from django.db import models
class P(models.Model):
pass
class R(models.Model):
is_default = models.BooleanField(default=False)
p = models.ForeignKey(P, models.CASCADE, null=True)
def __str__(self):
return "%s" % self.pk
def get_default_r():
return R.objects.get_or_create(is_default=True)[0].pk
class S(models.Model):
r = models.ForeignKey(R, models.CASCADE)
class T(models.Model):
s = models.ForeignKey(S, models.CASCADE)
class U(models.Model):
t = models.ForeignKey(T, models.CASCADE)
class RChild(R):
pass
class RChildChild(RChild):
pass
class A(models.Model):
name = models.CharField(max_length=30)
auto = models.ForeignKey(R, models.CASCADE, related_name="auto_set")
auto_nullable = models.ForeignKey(R, models.CASCADE, null=True, related_name='auto_nullable_set')
setvalue = models.ForeignKey(R, models.SET(get_default_r), related_name='setvalue')
setnull = models.ForeignKey(R, models.SET_NULL, null=True, related_name='setnull_set')
setdefault = models.ForeignKey(R, models.SET_DEFAULT, default=get_default_r, related_name='setdefault_set')
setdefault_none = models.ForeignKey(
R, models.SET_DEFAULT,
default=None, null=True, related_name='setnull_nullable_set',
)
cascade = models.ForeignKey(R, models.CASCADE, related_name='cascade_set')
cascade_nullable = models.ForeignKey(R, models.CASCADE, null=True, related_name='cascade_nullable_set')
protect = models.ForeignKey(R, models.PROTECT, null=True, related_name='protect_set')
restrict = models.ForeignKey(R, models.RESTRICT, null=True, related_name='restrict_set')
donothing = models.ForeignKey(R, models.DO_NOTHING, null=True, related_name='donothing_set')
child = models.ForeignKey(RChild, models.CASCADE, related_name="child")
child_setnull = models.ForeignKey(RChild, models.SET_NULL, null=True, related_name="child_setnull")
cascade_p = models.ForeignKey(P, models.CASCADE, related_name='cascade_p_set', null=True)
# A OneToOneField is just a ForeignKey unique=True, so we don't duplicate
# all the tests; just one smoke test to ensure on_delete works for it as
# well.
o2o_setnull = models.ForeignKey(R, models.SET_NULL, null=True, related_name="o2o_nullable_set")
class B(models.Model):
protect = models.ForeignKey(R, models.PROTECT)
def create_a(name):
a = A(name=name)
for name in ('auto', 'auto_nullable', 'setvalue', 'setnull', 'setdefault',
'setdefault_none', 'cascade', 'cascade_nullable', 'protect',
'restrict', 'donothing', 'o2o_setnull'):
r = R.objects.create()
setattr(a, name, r)
a.child = RChild.objects.create()
a.child_setnull = RChild.objects.create()
a.save()
return a
class M(models.Model):
m2m = models.ManyToManyField(R, related_name="m_set")
m2m_through = models.ManyToManyField(R, through="MR", related_name="m_through_set")
m2m_through_null = models.ManyToManyField(R, through="MRNull", related_name="m_through_null_set")
class MR(models.Model):
m = models.ForeignKey(M, models.CASCADE)
r = models.ForeignKey(R, models.CASCADE)
class MRNull(models.Model):
m = models.ForeignKey(M, models.CASCADE)
r = models.ForeignKey(R, models.SET_NULL, null=True)
class Avatar(models.Model):
desc = models.TextField(null=True)
# This model is used to test a duplicate query regression (#25685)
class AvatarProxy(Avatar):
class Meta:
proxy = True
class User(models.Model):
avatar = models.ForeignKey(Avatar, models.CASCADE, null=True)
class HiddenUser(models.Model):
r = models.ForeignKey(R, models.CASCADE, related_name="+")
class HiddenUserProfile(models.Model):
user = models.ForeignKey(HiddenUser, models.CASCADE)
class M2MTo(models.Model):
pass
class M2MFrom(models.Model):
m2m = models.ManyToManyField(M2MTo)
class Parent(models.Model):
pass
class Child(Parent):
pass
class Base(models.Model):
pass
class RelToBase(models.Model):
base = models.ForeignKey(Base, models.DO_NOTHING)
class Origin(models.Model):
pass
class Referrer(models.Model):
origin = models.ForeignKey(Origin, models.CASCADE)
unique_field = models.IntegerField(unique=True)
large_field = models.TextField()
class SecondReferrer(models.Model):
referrer = models.ForeignKey(Referrer, models.CASCADE)
other_referrer = models.ForeignKey(
Referrer, models.CASCADE, to_field='unique_field', related_name='+'
)
class DeleteTop(models.Model):
b1 = GenericRelation('GenericB1')
b2 = GenericRelation('GenericB2')
class B1(models.Model):
delete_top = models.ForeignKey(DeleteTop, models.CASCADE)
class B2(models.Model):
delete_top = models.ForeignKey(DeleteTop, models.CASCADE)
class B3(models.Model):
restrict = models.ForeignKey(R, models.RESTRICT)
class DeleteBottom(models.Model):
b1 = models.ForeignKey(B1, models.RESTRICT)
b2 = models.ForeignKey(B2, models.CASCADE)
class GenericB1(models.Model):
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.PositiveIntegerField()
generic_delete_top = GenericForeignKey('content_type', 'object_id')
class GenericB2(models.Model):
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.PositiveIntegerField()
generic_delete_top = GenericForeignKey('content_type', 'object_id')
generic_delete_bottom = GenericRelation('GenericDeleteBottom')
class GenericDeleteBottom(models.Model):
generic_b1 = models.ForeignKey(GenericB1, models.RESTRICT)
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.PositiveIntegerField()
generic_b2 = GenericForeignKey()
class GenericDeleteBottomParent(models.Model):
generic_delete_bottom = models.ForeignKey(GenericDeleteBottom, on_delete=models.CASCADE)
|
b5c63a4da52d6a649e1256113e3a402cbca748669de89aeea1f72dffc5f4bfec | from unittest import mock
from django.core.checks import Error, Warning as DjangoWarning
from django.db import connection, models
from django.test.testcases import SimpleTestCase
from django.test.utils import isolate_apps, override_settings
@isolate_apps('invalid_models_tests')
class RelativeFieldTests(SimpleTestCase):
def test_valid_foreign_key_without_accessor(self):
class Target(models.Model):
# There would be a clash if Model.field installed an accessor.
model = models.IntegerField()
class Model(models.Model):
field = models.ForeignKey(Target, models.CASCADE, related_name='+')
field = Model._meta.get_field('field')
self.assertEqual(field.check(), [])
def test_foreign_key_to_missing_model(self):
# Model names are resolved when a model is being created, so we cannot
# test relative fields in isolation and we need to attach them to a
# model.
class Model(models.Model):
foreign_key = models.ForeignKey('Rel1', models.CASCADE)
field = Model._meta.get_field('foreign_key')
self.assertEqual(field.check(), [
Error(
"Field defines a relation with model 'Rel1', "
"which is either not installed, or is abstract.",
obj=field,
id='fields.E300',
),
])
@isolate_apps('invalid_models_tests')
def test_foreign_key_to_isolate_apps_model(self):
"""
#25723 - Referenced model registration lookup should be run against the
field's model registry.
"""
class OtherModel(models.Model):
pass
class Model(models.Model):
foreign_key = models.ForeignKey('OtherModel', models.CASCADE)
field = Model._meta.get_field('foreign_key')
self.assertEqual(field.check(from_model=Model), [])
def test_many_to_many_to_missing_model(self):
class Model(models.Model):
m2m = models.ManyToManyField("Rel2")
field = Model._meta.get_field('m2m')
self.assertEqual(field.check(from_model=Model), [
Error(
"Field defines a relation with model 'Rel2', "
"which is either not installed, or is abstract.",
obj=field,
id='fields.E300',
),
])
@isolate_apps('invalid_models_tests')
def test_many_to_many_to_isolate_apps_model(self):
"""
#25723 - Referenced model registration lookup should be run against the
field's model registry.
"""
class OtherModel(models.Model):
pass
class Model(models.Model):
m2m = models.ManyToManyField('OtherModel')
field = Model._meta.get_field('m2m')
self.assertEqual(field.check(from_model=Model), [])
def test_many_to_many_with_limit_choices_auto_created_no_warning(self):
class Model(models.Model):
name = models.CharField(max_length=20)
class ModelM2M(models.Model):
m2m = models.ManyToManyField(Model, limit_choices_to={'name': 'test_name'})
self.assertEqual(ModelM2M.check(), [])
def test_many_to_many_with_useless_options(self):
class Model(models.Model):
name = models.CharField(max_length=20)
class ModelM2M(models.Model):
m2m = models.ManyToManyField(
Model,
null=True,
validators=[lambda x: x],
limit_choices_to={'name': 'test_name'},
through='ThroughModel',
through_fields=('modelm2m', 'model'),
)
class ThroughModel(models.Model):
model = models.ForeignKey('Model', models.CASCADE)
modelm2m = models.ForeignKey('ModelM2M', models.CASCADE)
field = ModelM2M._meta.get_field('m2m')
self.assertEqual(ModelM2M.check(), [
DjangoWarning(
'null has no effect on ManyToManyField.',
obj=field,
id='fields.W340',
),
DjangoWarning(
'ManyToManyField does not support validators.',
obj=field,
id='fields.W341',
),
DjangoWarning(
'limit_choices_to has no effect on ManyToManyField '
'with a through model.',
obj=field,
id='fields.W343',
),
])
def test_ambiguous_relationship_model(self):
class Person(models.Model):
pass
class Group(models.Model):
field = models.ManyToManyField('Person', through="AmbiguousRelationship", related_name='tertiary')
class AmbiguousRelationship(models.Model):
# Too much foreign keys to Person.
first_person = models.ForeignKey(Person, models.CASCADE, related_name="first")
second_person = models.ForeignKey(Person, models.CASCADE, related_name="second")
second_model = models.ForeignKey(Group, models.CASCADE)
field = Group._meta.get_field('field')
self.assertEqual(field.check(from_model=Group), [
Error(
"The model is used as an intermediate model by "
"'invalid_models_tests.Group.field', but it has more than one "
"foreign key to 'Person', which is ambiguous. You must specify "
"which foreign key Django should use via the through_fields "
"keyword argument.",
hint=(
'If you want to create a recursive relationship, use '
'ForeignKey("self", symmetrical=False, through="AmbiguousRelationship").'
),
obj=field,
id='fields.E335',
),
])
def test_relationship_model_with_foreign_key_to_wrong_model(self):
class WrongModel(models.Model):
pass
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person', through="InvalidRelationship")
class InvalidRelationship(models.Model):
person = models.ForeignKey(Person, models.CASCADE)
wrong_foreign_key = models.ForeignKey(WrongModel, models.CASCADE)
# The last foreign key should point to Group model.
field = Group._meta.get_field('members')
self.assertEqual(field.check(from_model=Group), [
Error(
"The model is used as an intermediate model by "
"'invalid_models_tests.Group.members', but it does not "
"have a foreign key to 'Group' or 'Person'.",
obj=InvalidRelationship,
id='fields.E336',
),
])
def test_relationship_model_missing_foreign_key(self):
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person', through="InvalidRelationship")
class InvalidRelationship(models.Model):
group = models.ForeignKey(Group, models.CASCADE)
# No foreign key to Person
field = Group._meta.get_field('members')
self.assertEqual(field.check(from_model=Group), [
Error(
"The model is used as an intermediate model by "
"'invalid_models_tests.Group.members', but it does not have "
"a foreign key to 'Group' or 'Person'.",
obj=InvalidRelationship,
id='fields.E336',
),
])
def test_missing_relationship_model(self):
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person', through="MissingM2MModel")
field = Group._meta.get_field('members')
self.assertEqual(field.check(from_model=Group), [
Error(
"Field specifies a many-to-many relation through model "
"'MissingM2MModel', which has not been installed.",
obj=field,
id='fields.E331',
),
])
def test_missing_relationship_model_on_model_check(self):
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person', through='MissingM2MModel')
self.assertEqual(Group.check(), [
Error(
"Field specifies a many-to-many relation through model "
"'MissingM2MModel', which has not been installed.",
obj=Group._meta.get_field('members'),
id='fields.E331',
),
])
@isolate_apps('invalid_models_tests')
def test_many_to_many_through_isolate_apps_model(self):
"""
#25723 - Through model registration lookup should be run against the
field's model registry.
"""
class GroupMember(models.Model):
person = models.ForeignKey('Person', models.CASCADE)
group = models.ForeignKey('Group', models.CASCADE)
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person', through='GroupMember')
field = Group._meta.get_field('members')
self.assertEqual(field.check(from_model=Group), [])
def test_too_many_foreign_keys_in_self_referential_model(self):
class Person(models.Model):
friends = models.ManyToManyField('self', through="InvalidRelationship", symmetrical=False)
class InvalidRelationship(models.Model):
first = models.ForeignKey(Person, models.CASCADE, related_name="rel_from_set_2")
second = models.ForeignKey(Person, models.CASCADE, related_name="rel_to_set_2")
third = models.ForeignKey(Person, models.CASCADE, related_name="too_many_by_far")
field = Person._meta.get_field('friends')
self.assertEqual(field.check(from_model=Person), [
Error(
"The model is used as an intermediate model by "
"'invalid_models_tests.Person.friends', but it has more than two "
"foreign keys to 'Person', which is ambiguous. You must specify "
"which two foreign keys Django should use via the through_fields "
"keyword argument.",
hint='Use through_fields to specify which two foreign keys Django should use.',
obj=InvalidRelationship,
id='fields.E333',
),
])
def test_foreign_key_to_abstract_model(self):
class AbstractModel(models.Model):
class Meta:
abstract = True
class Model(models.Model):
rel_string_foreign_key = models.ForeignKey('AbstractModel', models.CASCADE)
rel_class_foreign_key = models.ForeignKey(AbstractModel, models.CASCADE)
fields = [
Model._meta.get_field('rel_string_foreign_key'),
Model._meta.get_field('rel_class_foreign_key'),
]
expected_error = Error(
"Field defines a relation with model 'AbstractModel', "
"which is either not installed, or is abstract.",
id='fields.E300',
)
for field in fields:
expected_error.obj = field
self.assertEqual(field.check(), [expected_error])
def test_m2m_to_abstract_model(self):
class AbstractModel(models.Model):
class Meta:
abstract = True
class Model(models.Model):
rel_string_m2m = models.ManyToManyField('AbstractModel')
rel_class_m2m = models.ManyToManyField(AbstractModel)
fields = [
Model._meta.get_field('rel_string_m2m'),
Model._meta.get_field('rel_class_m2m'),
]
expected_error = Error(
"Field defines a relation with model 'AbstractModel', "
"which is either not installed, or is abstract.",
id='fields.E300',
)
for field in fields:
expected_error.obj = field
self.assertEqual(field.check(from_model=Model), [expected_error])
def test_unique_m2m(self):
class Person(models.Model):
name = models.CharField(max_length=5)
class Group(models.Model):
members = models.ManyToManyField('Person', unique=True)
field = Group._meta.get_field('members')
self.assertEqual(field.check(from_model=Group), [
Error(
'ManyToManyFields cannot be unique.',
obj=field,
id='fields.E330',
),
])
def test_foreign_key_to_non_unique_field(self):
class Target(models.Model):
bad = models.IntegerField() # No unique=True
class Model(models.Model):
foreign_key = models.ForeignKey('Target', models.CASCADE, to_field='bad')
field = Model._meta.get_field('foreign_key')
self.assertEqual(field.check(), [
Error(
"'Target.bad' must set unique=True because it is referenced by a foreign key.",
obj=field,
id='fields.E311',
),
])
def test_foreign_key_to_non_unique_field_under_explicit_model(self):
class Target(models.Model):
bad = models.IntegerField()
class Model(models.Model):
field = models.ForeignKey(Target, models.CASCADE, to_field='bad')
field = Model._meta.get_field('field')
self.assertEqual(field.check(), [
Error(
"'Target.bad' must set unique=True because it is referenced by a foreign key.",
obj=field,
id='fields.E311',
),
])
def test_foreign_object_to_non_unique_fields(self):
class Person(models.Model):
# Note that both fields are not unique.
country_id = models.IntegerField()
city_id = models.IntegerField()
class MMembership(models.Model):
person_country_id = models.IntegerField()
person_city_id = models.IntegerField()
person = models.ForeignObject(
Person,
on_delete=models.CASCADE,
from_fields=['person_country_id', 'person_city_id'],
to_fields=['country_id', 'city_id'],
)
field = MMembership._meta.get_field('person')
self.assertEqual(field.check(), [
Error(
"No subset of the fields 'country_id', 'city_id' on model 'Person' is unique.",
hint=(
"Add unique=True on any of those fields or add at least "
"a subset of them to a unique_together constraint."
),
obj=field,
id='fields.E310',
)
])
def test_on_delete_set_null_on_non_nullable_field(self):
class Person(models.Model):
pass
class Model(models.Model):
foreign_key = models.ForeignKey('Person', models.SET_NULL)
field = Model._meta.get_field('foreign_key')
self.assertEqual(field.check(), [
Error(
'Field specifies on_delete=SET_NULL, but cannot be null.',
hint='Set null=True argument on the field, or change the on_delete rule.',
obj=field,
id='fields.E320',
),
])
def test_on_delete_set_default_without_default_value(self):
class Person(models.Model):
pass
class Model(models.Model):
foreign_key = models.ForeignKey('Person', models.SET_DEFAULT)
field = Model._meta.get_field('foreign_key')
self.assertEqual(field.check(), [
Error(
'Field specifies on_delete=SET_DEFAULT, but has no default value.',
hint='Set a default value, or change the on_delete rule.',
obj=field,
id='fields.E321',
),
])
def test_nullable_primary_key(self):
class Model(models.Model):
field = models.IntegerField(primary_key=True, null=True)
field = Model._meta.get_field('field')
with mock.patch.object(connection.features, 'interprets_empty_strings_as_nulls', False):
results = field.check()
self.assertEqual(results, [
Error(
'Primary keys must not have null=True.',
hint='Set null=False on the field, or remove primary_key=True argument.',
obj=field,
id='fields.E007',
),
])
def test_not_swapped_model(self):
class SwappableModel(models.Model):
# A model that can be, but isn't swapped out. References to this
# model should *not* raise any validation error.
class Meta:
swappable = 'TEST_SWAPPABLE_MODEL'
class Model(models.Model):
explicit_fk = models.ForeignKey(
SwappableModel,
models.CASCADE,
related_name='explicit_fk',
)
implicit_fk = models.ForeignKey(
'invalid_models_tests.SwappableModel',
models.CASCADE,
related_name='implicit_fk',
)
explicit_m2m = models.ManyToManyField(SwappableModel, related_name='explicit_m2m')
implicit_m2m = models.ManyToManyField(
'invalid_models_tests.SwappableModel',
related_name='implicit_m2m',
)
explicit_fk = Model._meta.get_field('explicit_fk')
self.assertEqual(explicit_fk.check(), [])
implicit_fk = Model._meta.get_field('implicit_fk')
self.assertEqual(implicit_fk.check(), [])
explicit_m2m = Model._meta.get_field('explicit_m2m')
self.assertEqual(explicit_m2m.check(from_model=Model), [])
implicit_m2m = Model._meta.get_field('implicit_m2m')
self.assertEqual(implicit_m2m.check(from_model=Model), [])
@override_settings(TEST_SWAPPED_MODEL='invalid_models_tests.Replacement')
def test_referencing_to_swapped_model(self):
class Replacement(models.Model):
pass
class SwappedModel(models.Model):
class Meta:
swappable = 'TEST_SWAPPED_MODEL'
class Model(models.Model):
explicit_fk = models.ForeignKey(
SwappedModel,
models.CASCADE,
related_name='explicit_fk',
)
implicit_fk = models.ForeignKey(
'invalid_models_tests.SwappedModel',
models.CASCADE,
related_name='implicit_fk',
)
explicit_m2m = models.ManyToManyField(SwappedModel, related_name='explicit_m2m')
implicit_m2m = models.ManyToManyField(
'invalid_models_tests.SwappedModel',
related_name='implicit_m2m',
)
fields = [
Model._meta.get_field('explicit_fk'),
Model._meta.get_field('implicit_fk'),
Model._meta.get_field('explicit_m2m'),
Model._meta.get_field('implicit_m2m'),
]
expected_error = Error(
("Field defines a relation with the model "
"'invalid_models_tests.SwappedModel', which has been swapped out."),
hint="Update the relation to point at 'settings.TEST_SWAPPED_MODEL'.",
id='fields.E301',
)
for field in fields:
expected_error.obj = field
self.assertEqual(field.check(from_model=Model), [expected_error])
def test_related_field_has_invalid_related_name(self):
digit = 0
illegal_non_alphanumeric = '!'
whitespace = '\t'
invalid_related_names = [
'%s_begins_with_digit' % digit,
'%s_begins_with_illegal_non_alphanumeric' % illegal_non_alphanumeric,
'%s_begins_with_whitespace' % whitespace,
'contains_%s_illegal_non_alphanumeric' % illegal_non_alphanumeric,
'contains_%s_whitespace' % whitespace,
'ends_with_with_illegal_non_alphanumeric_%s' % illegal_non_alphanumeric,
'ends_with_whitespace_%s' % whitespace,
'with', # a Python keyword
'related_name\n',
'',
'，', # non-ASCII
]
class Parent(models.Model):
pass
for invalid_related_name in invalid_related_names:
Child = type('Child%s' % invalid_related_name, (models.Model,), {
'parent': models.ForeignKey('Parent', models.CASCADE, related_name=invalid_related_name),
'__module__': Parent.__module__,
})
field = Child._meta.get_field('parent')
self.assertEqual(Child.check(), [
Error(
"The name '%s' is invalid related_name for field Child%s.parent"
% (invalid_related_name, invalid_related_name),
hint="Related name must be a valid Python identifier or end with a '+'",
obj=field,
id='fields.E306',
),
])
def test_related_field_has_valid_related_name(self):
lowercase = 'a'
uppercase = 'A'
digit = 0
related_names = [
'%s_starts_with_lowercase' % lowercase,
'%s_tarts_with_uppercase' % uppercase,
'_starts_with_underscore',
'contains_%s_digit' % digit,
'ends_with_plus+',
'_+',
'+',
'試',
'試驗+',
]
class Parent(models.Model):
pass
for related_name in related_names:
Child = type('Child%s' % related_name, (models.Model,), {
'parent': models.ForeignKey('Parent', models.CASCADE, related_name=related_name),
'__module__': Parent.__module__,
})
self.assertEqual(Child.check(), [])
def test_to_fields_exist(self):
class Parent(models.Model):
pass
class Child(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
parent = models.ForeignObject(
Parent,
on_delete=models.SET_NULL,
from_fields=('a', 'b'),
to_fields=('a', 'b'),
)
field = Child._meta.get_field('parent')
self.assertEqual(field.check(), [
Error(
"The to_field 'a' doesn't exist on the related model 'invalid_models_tests.Parent'.",
obj=field,
id='fields.E312',
),
Error(
"The to_field 'b' doesn't exist on the related model 'invalid_models_tests.Parent'.",
obj=field,
id='fields.E312',
),
])
def test_to_fields_not_checked_if_related_model_doesnt_exist(self):
class Child(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
parent = models.ForeignObject(
'invalid_models_tests.Parent',
on_delete=models.SET_NULL,
from_fields=('a', 'b'),
to_fields=('a', 'b'),
)
field = Child._meta.get_field('parent')
self.assertEqual(field.check(), [
Error(
"Field defines a relation with model 'invalid_models_tests.Parent', "
"which is either not installed, or is abstract.",
id='fields.E300',
obj=field,
),
])
def test_invalid_related_query_name(self):
class Target(models.Model):
pass
class Model(models.Model):
first = models.ForeignKey(Target, models.CASCADE, related_name='contains__double')
second = models.ForeignKey(Target, models.CASCADE, related_query_name='ends_underscore_')
self.assertEqual(Model.check(), [
Error(
"Reverse query name 'contains__double' must not contain '__'.",
hint=("Add or change a related_name or related_query_name "
"argument for this field."),
obj=Model._meta.get_field('first'),
id='fields.E309',
),
Error(
"Reverse query name 'ends_underscore_' must not end with an "
"underscore.",
hint=("Add or change a related_name or related_query_name "
"argument for this field."),
obj=Model._meta.get_field('second'),
id='fields.E308',
),
])
@isolate_apps('invalid_models_tests')
class AccessorClashTests(SimpleTestCase):
def test_fk_to_integer(self):
self._test_accessor_clash(
target=models.IntegerField(),
relative=models.ForeignKey('Target', models.CASCADE))
def test_fk_to_fk(self):
self._test_accessor_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ForeignKey('Target', models.CASCADE))
def test_fk_to_m2m(self):
self._test_accessor_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey('Target', models.CASCADE))
def test_m2m_to_integer(self):
self._test_accessor_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target'))
def test_m2m_to_fk(self):
self._test_accessor_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ManyToManyField('Target'))
def test_m2m_to_m2m(self):
self._test_accessor_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField('Target'))
def _test_accessor_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
model_set = target
class Model(models.Model):
rel = relative
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.rel' clashes with field name 'Target.model_set'.",
hint=("Rename field 'Target.model_set', or add/change "
"a related_name argument to the definition "
"for field 'Model.rel'."),
obj=Model._meta.get_field('rel'),
id='fields.E302',
),
])
def test_clash_between_accessors(self):
class Target(models.Model):
pass
class Model(models.Model):
foreign = models.ForeignKey(Target, models.CASCADE)
m2m = models.ManyToManyField(Target)
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.foreign' clashes with reverse accessor for 'Model.m2m'.",
hint=(
"Add or change a related_name argument to the definition "
"for 'Model.foreign' or 'Model.m2m'."
),
obj=Model._meta.get_field('foreign'),
id='fields.E304',
),
Error(
"Reverse accessor for 'Model.m2m' clashes with reverse accessor for 'Model.foreign'.",
hint=(
"Add or change a related_name argument to the definition "
"for 'Model.m2m' or 'Model.foreign'."
),
obj=Model._meta.get_field('m2m'),
id='fields.E304',
),
])
def test_m2m_to_m2m_with_inheritance(self):
""" Ref #22047. """
class Target(models.Model):
pass
class Model(models.Model):
children = models.ManyToManyField('Child', related_name="m2m_clash", related_query_name="no_clash")
class Parent(models.Model):
m2m_clash = models.ManyToManyField('Target')
class Child(Parent):
pass
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.children' clashes with field name 'Child.m2m_clash'.",
hint=(
"Rename field 'Child.m2m_clash', or add/change a related_name "
"argument to the definition for field 'Model.children'."
),
obj=Model._meta.get_field('children'),
id='fields.E302',
)
])
def test_no_clash_for_hidden_related_name(self):
class Stub(models.Model):
pass
class ManyToManyRel(models.Model):
thing1 = models.ManyToManyField(Stub, related_name='+')
thing2 = models.ManyToManyField(Stub, related_name='+')
class FKRel(models.Model):
thing1 = models.ForeignKey(Stub, models.CASCADE, related_name='+')
thing2 = models.ForeignKey(Stub, models.CASCADE, related_name='+')
self.assertEqual(ManyToManyRel.check(), [])
self.assertEqual(FKRel.check(), [])
@isolate_apps('invalid_models_tests')
class ReverseQueryNameClashTests(SimpleTestCase):
def test_fk_to_integer(self):
self._test_reverse_query_name_clash(
target=models.IntegerField(),
relative=models.ForeignKey('Target', models.CASCADE))
def test_fk_to_fk(self):
self._test_reverse_query_name_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ForeignKey('Target', models.CASCADE))
def test_fk_to_m2m(self):
self._test_reverse_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey('Target', models.CASCADE))
def test_m2m_to_integer(self):
self._test_reverse_query_name_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target'))
def test_m2m_to_fk(self):
self._test_reverse_query_name_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ManyToManyField('Target'))
def test_m2m_to_m2m(self):
self._test_reverse_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField('Target'))
def _test_reverse_query_name_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
model = target
class Model(models.Model):
rel = relative
self.assertEqual(Model.check(), [
Error(
"Reverse query name for 'Model.rel' clashes with field name 'Target.model'.",
hint=(
"Rename field 'Target.model', or add/change a related_name "
"argument to the definition for field 'Model.rel'."
),
obj=Model._meta.get_field('rel'),
id='fields.E303',
),
])
@isolate_apps('invalid_models_tests')
class ExplicitRelatedNameClashTests(SimpleTestCase):
def test_fk_to_integer(self):
self._test_explicit_related_name_clash(
target=models.IntegerField(),
relative=models.ForeignKey('Target', models.CASCADE, related_name='clash'))
def test_fk_to_fk(self):
self._test_explicit_related_name_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ForeignKey('Target', models.CASCADE, related_name='clash'))
def test_fk_to_m2m(self):
self._test_explicit_related_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey('Target', models.CASCADE, related_name='clash'))
def test_m2m_to_integer(self):
self._test_explicit_related_name_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target', related_name='clash'))
def test_m2m_to_fk(self):
self._test_explicit_related_name_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ManyToManyField('Target', related_name='clash'))
def test_m2m_to_m2m(self):
self._test_explicit_related_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField('Target', related_name='clash'))
def _test_explicit_related_name_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
clash = target
class Model(models.Model):
rel = relative
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.rel' clashes with field name 'Target.clash'.",
hint=(
"Rename field 'Target.clash', or add/change a related_name "
"argument to the definition for field 'Model.rel'."
),
obj=Model._meta.get_field('rel'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.rel' clashes with field name 'Target.clash'.",
hint=(
"Rename field 'Target.clash', or add/change a related_name "
"argument to the definition for field 'Model.rel'."
),
obj=Model._meta.get_field('rel'),
id='fields.E303',
),
])
@isolate_apps('invalid_models_tests')
class ExplicitRelatedQueryNameClashTests(SimpleTestCase):
def test_fk_to_integer(self, related_name=None):
self._test_explicit_related_query_name_clash(
target=models.IntegerField(),
relative=models.ForeignKey(
'Target',
models.CASCADE,
related_name=related_name,
related_query_name='clash',
)
)
def test_hidden_fk_to_integer(self, related_name=None):
self.test_fk_to_integer(related_name='+')
def test_fk_to_fk(self, related_name=None):
self._test_explicit_related_query_name_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ForeignKey(
'Target',
models.CASCADE,
related_name=related_name,
related_query_name='clash',
)
)
def test_hidden_fk_to_fk(self):
self.test_fk_to_fk(related_name='+')
def test_fk_to_m2m(self, related_name=None):
self._test_explicit_related_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey(
'Target',
models.CASCADE,
related_name=related_name,
related_query_name='clash',
)
)
def test_hidden_fk_to_m2m(self):
self.test_fk_to_m2m(related_name='+')
def test_m2m_to_integer(self, related_name=None):
self._test_explicit_related_query_name_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target', related_name=related_name, related_query_name='clash'))
def test_hidden_m2m_to_integer(self):
self.test_m2m_to_integer(related_name='+')
def test_m2m_to_fk(self, related_name=None):
self._test_explicit_related_query_name_clash(
target=models.ForeignKey('Another', models.CASCADE),
relative=models.ManyToManyField('Target', related_name=related_name, related_query_name='clash'))
def test_hidden_m2m_to_fk(self):
self.test_m2m_to_fk(related_name='+')
def test_m2m_to_m2m(self, related_name=None):
self._test_explicit_related_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField(
'Target',
related_name=related_name,
related_query_name='clash',
)
)
def test_hidden_m2m_to_m2m(self):
self.test_m2m_to_m2m(related_name='+')
def _test_explicit_related_query_name_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
clash = target
class Model(models.Model):
rel = relative
self.assertEqual(Model.check(), [
Error(
"Reverse query name for 'Model.rel' clashes with field name 'Target.clash'.",
hint=(
"Rename field 'Target.clash', or add/change a related_name "
"argument to the definition for field 'Model.rel'."
),
obj=Model._meta.get_field('rel'),
id='fields.E303',
),
])
@isolate_apps('invalid_models_tests')
class SelfReferentialM2MClashTests(SimpleTestCase):
def test_clash_between_accessors(self):
class Model(models.Model):
first_m2m = models.ManyToManyField('self', symmetrical=False)
second_m2m = models.ManyToManyField('self', symmetrical=False)
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.first_m2m' clashes with reverse accessor for 'Model.second_m2m'.",
hint=(
"Add or change a related_name argument to the definition "
"for 'Model.first_m2m' or 'Model.second_m2m'."
),
obj=Model._meta.get_field('first_m2m'),
id='fields.E304',
),
Error(
"Reverse accessor for 'Model.second_m2m' clashes with reverse accessor for 'Model.first_m2m'.",
hint=(
"Add or change a related_name argument to the definition "
"for 'Model.second_m2m' or 'Model.first_m2m'."
),
obj=Model._meta.get_field('second_m2m'),
id='fields.E304',
),
])
def test_accessor_clash(self):
class Model(models.Model):
model_set = models.ManyToManyField("self", symmetrical=False)
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.model_set' clashes with field name 'Model.model_set'.",
hint=(
"Rename field 'Model.model_set', or add/change a related_name "
"argument to the definition for field 'Model.model_set'."
),
obj=Model._meta.get_field('model_set'),
id='fields.E302',
),
])
def test_reverse_query_name_clash(self):
class Model(models.Model):
model = models.ManyToManyField("self", symmetrical=False)
self.assertEqual(Model.check(), [
Error(
"Reverse query name for 'Model.model' clashes with field name 'Model.model'.",
hint=(
"Rename field 'Model.model', or add/change a related_name "
"argument to the definition for field 'Model.model'."
),
obj=Model._meta.get_field('model'),
id='fields.E303',
),
])
def test_clash_under_explicit_related_name(self):
class Model(models.Model):
clash = models.IntegerField()
m2m = models.ManyToManyField("self", symmetrical=False, related_name='clash')
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.m2m' clashes with field name 'Model.clash'.",
hint=(
"Rename field 'Model.clash', or add/change a related_name "
"argument to the definition for field 'Model.m2m'."
),
obj=Model._meta.get_field('m2m'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.m2m' clashes with field name 'Model.clash'.",
hint=(
"Rename field 'Model.clash', or add/change a related_name "
"argument to the definition for field 'Model.m2m'."
),
obj=Model._meta.get_field('m2m'),
id='fields.E303',
),
])
def test_valid_model(self):
class Model(models.Model):
first = models.ManyToManyField("self", symmetrical=False, related_name='first_accessor')
second = models.ManyToManyField("self", symmetrical=False, related_name='second_accessor')
self.assertEqual(Model.check(), [])
@isolate_apps('invalid_models_tests')
class SelfReferentialFKClashTests(SimpleTestCase):
def test_accessor_clash(self):
class Model(models.Model):
model_set = models.ForeignKey("Model", models.CASCADE)
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.model_set' clashes with field name 'Model.model_set'.",
hint=(
"Rename field 'Model.model_set', or add/change "
"a related_name argument to the definition "
"for field 'Model.model_set'."
),
obj=Model._meta.get_field('model_set'),
id='fields.E302',
),
])
def test_reverse_query_name_clash(self):
class Model(models.Model):
model = models.ForeignKey("Model", models.CASCADE)
self.assertEqual(Model.check(), [
Error(
"Reverse query name for 'Model.model' clashes with field name 'Model.model'.",
hint=(
"Rename field 'Model.model', or add/change a related_name "
"argument to the definition for field 'Model.model'."
),
obj=Model._meta.get_field('model'),
id='fields.E303',
),
])
def test_clash_under_explicit_related_name(self):
class Model(models.Model):
clash = models.CharField(max_length=10)
foreign = models.ForeignKey("Model", models.CASCADE, related_name='clash')
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.foreign' clashes with field name 'Model.clash'.",
hint=(
"Rename field 'Model.clash', or add/change a related_name "
"argument to the definition for field 'Model.foreign'."
),
obj=Model._meta.get_field('foreign'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.foreign' clashes with field name 'Model.clash'.",
hint=(
"Rename field 'Model.clash', or add/change a related_name "
"argument to the definition for field 'Model.foreign'."
),
obj=Model._meta.get_field('foreign'),
id='fields.E303',
),
])
@isolate_apps('invalid_models_tests')
class ComplexClashTests(SimpleTestCase):
# New tests should not be included here, because this is a single,
# self-contained sanity check, not a test of everything.
def test_complex_clash(self):
class Target(models.Model):
tgt_safe = models.CharField(max_length=10)
clash = models.CharField(max_length=10)
model = models.CharField(max_length=10)
clash1_set = models.CharField(max_length=10)
class Model(models.Model):
src_safe = models.CharField(max_length=10)
foreign_1 = models.ForeignKey(Target, models.CASCADE, related_name='id')
foreign_2 = models.ForeignKey(Target, models.CASCADE, related_name='src_safe')
m2m_1 = models.ManyToManyField(Target, related_name='id')
m2m_2 = models.ManyToManyField(Target, related_name='src_safe')
self.assertEqual(Model.check(), [
Error(
"Reverse accessor for 'Model.foreign_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.foreign_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.foreign_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.foreign_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E303',
),
Error(
"Reverse accessor for 'Model.foreign_1' clashes with reverse accessor for 'Model.m2m_1'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.foreign_1' or 'Model.m2m_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.foreign_1' clashes with reverse query name for 'Model.m2m_1'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.foreign_1' or 'Model.m2m_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E305',
),
Error(
"Reverse accessor for 'Model.foreign_2' clashes with reverse accessor for 'Model.m2m_2'.",
hint=("Add or change a related_name argument "
"to the definition for 'Model.foreign_2' or 'Model.m2m_2'."),
obj=Model._meta.get_field('foreign_2'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.foreign_2' clashes with reverse query name for 'Model.m2m_2'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.foreign_2' or 'Model.m2m_2'."),
obj=Model._meta.get_field('foreign_2'),
id='fields.E305',
),
Error(
"Reverse accessor for 'Model.m2m_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.m2m_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.m2m_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.m2m_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E303',
),
Error(
"Reverse accessor for 'Model.m2m_1' clashes with reverse accessor for 'Model.foreign_1'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.m2m_1' or 'Model.foreign_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.m2m_1' clashes with reverse query name for 'Model.foreign_1'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.m2m_1' or 'Model.foreign_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E305',
),
Error(
"Reverse accessor for 'Model.m2m_2' clashes with reverse accessor for 'Model.foreign_2'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.m2m_2' or 'Model.foreign_2'."),
obj=Model._meta.get_field('m2m_2'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.m2m_2' clashes with reverse query name for 'Model.foreign_2'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.m2m_2' or 'Model.foreign_2'."),
obj=Model._meta.get_field('m2m_2'),
id='fields.E305',
),
])
def test_clash_parent_link(self):
class Parent(models.Model):
pass
class Child(Parent):
other_parent = models.OneToOneField(Parent, models.CASCADE)
errors = [
('fields.E304', 'accessor', 'parent_ptr', 'other_parent'),
('fields.E305', 'query name', 'parent_ptr', 'other_parent'),
('fields.E304', 'accessor', 'other_parent', 'parent_ptr'),
('fields.E305', 'query name', 'other_parent', 'parent_ptr'),
]
self.assertEqual(Child.check(), [
Error(
"Reverse %s for 'Child.%s' clashes with reverse %s for "
"'Child.%s'." % (attr, field_name, attr, clash_name),
hint=(
"Add or change a related_name argument to the definition "
"for 'Child.%s' or 'Child.%s'." % (field_name, clash_name)
),
obj=Child._meta.get_field(field_name),
id=error_id,
)
for error_id, attr, field_name, clash_name in errors
])
@isolate_apps('invalid_models_tests')
class M2mThroughFieldsTests(SimpleTestCase):
def test_m2m_field_argument_validation(self):
"""
ManyToManyField accepts the ``through_fields`` kwarg
only if an intermediary table is specified.
"""
class Fan(models.Model):
pass
with self.assertRaisesMessage(ValueError, 'Cannot specify through_fields without a through model'):
models.ManyToManyField(Fan, through_fields=('f1', 'f2'))
def test_invalid_order(self):
"""
Mixing up the order of link fields to ManyToManyField.through_fields
triggers validation errors.
"""
class Fan(models.Model):
pass
class Event(models.Model):
invitees = models.ManyToManyField(Fan, through='Invitation', through_fields=('invitee', 'event'))
class Invitation(models.Model):
event = models.ForeignKey(Event, models.CASCADE)
invitee = models.ForeignKey(Fan, models.CASCADE)
inviter = models.ForeignKey(Fan, models.CASCADE, related_name='+')
field = Event._meta.get_field('invitees')
self.assertEqual(field.check(from_model=Event), [
Error(
"'Invitation.invitee' is not a foreign key to 'Event'.",
hint="Did you mean one of the following foreign keys to 'Event': event?",
obj=field,
id='fields.E339',
),
Error(
"'Invitation.event' is not a foreign key to 'Fan'.",
hint="Did you mean one of the following foreign keys to 'Fan': invitee, inviter?",
obj=field,
id='fields.E339',
),
])
def test_invalid_field(self):
"""
Providing invalid field names to ManyToManyField.through_fields
triggers validation errors.
"""
class Fan(models.Model):
pass
class Event(models.Model):
invitees = models.ManyToManyField(
Fan,
through='Invitation',
through_fields=('invalid_field_1', 'invalid_field_2'),
)
class Invitation(models.Model):
event = models.ForeignKey(Event, models.CASCADE)
invitee = models.ForeignKey(Fan, models.CASCADE)
inviter = models.ForeignKey(Fan, models.CASCADE, related_name='+')
field = Event._meta.get_field('invitees')
self.assertEqual(field.check(from_model=Event), [
Error(
"The intermediary model 'invalid_models_tests.Invitation' has no field 'invalid_field_1'.",
hint="Did you mean one of the following foreign keys to 'Event': event?",
obj=field,
id='fields.E338',
),
Error(
"The intermediary model 'invalid_models_tests.Invitation' has no field 'invalid_field_2'.",
hint="Did you mean one of the following foreign keys to 'Fan': invitee, inviter?",
obj=field,
id='fields.E338',
),
])
def test_explicit_field_names(self):
"""
If ``through_fields`` kwarg is given, it must specify both
link fields of the intermediary table.
"""
class Fan(models.Model):
pass
class Event(models.Model):
invitees = models.ManyToManyField(Fan, through='Invitation', through_fields=(None, 'invitee'))
class Invitation(models.Model):
event = models.ForeignKey(Event, models.CASCADE)
invitee = models.ForeignKey(Fan, models.CASCADE)
inviter = models.ForeignKey(Fan, models.CASCADE, related_name='+')
field = Event._meta.get_field('invitees')
self.assertEqual(field.check(from_model=Event), [
Error(
"Field specifies 'through_fields' but does not provide the names "
"of the two link fields that should be used for the relation "
"through model 'invalid_models_tests.Invitation'.",
hint="Make sure you specify 'through_fields' as through_fields=('field1', 'field2')",
obj=field,
id='fields.E337',
),
])
def test_superset_foreign_object(self):
class Parent(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
c = models.PositiveIntegerField()
class Meta:
unique_together = (('a', 'b', 'c'),)
class Child(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
value = models.CharField(max_length=255)
parent = models.ForeignObject(
Parent,
on_delete=models.SET_NULL,
from_fields=('a', 'b'),
to_fields=('a', 'b'),
related_name='children',
)
field = Child._meta.get_field('parent')
self.assertEqual(field.check(from_model=Child), [
Error(
"No subset of the fields 'a', 'b' on model 'Parent' is unique.",
hint=(
"Add unique=True on any of those fields or add at least "
"a subset of them to a unique_together constraint."
),
obj=field,
id='fields.E310',
),
])
def test_intersection_foreign_object(self):
class Parent(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
c = models.PositiveIntegerField()
d = models.PositiveIntegerField()
class Meta:
unique_together = (('a', 'b', 'c'),)
class Child(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
d = models.PositiveIntegerField()
value = models.CharField(max_length=255)
parent = models.ForeignObject(
Parent,
on_delete=models.SET_NULL,
from_fields=('a', 'b', 'd'),
to_fields=('a', 'b', 'd'),
related_name='children',
)
field = Child._meta.get_field('parent')
self.assertEqual(field.check(from_model=Child), [
Error(
"No subset of the fields 'a', 'b', 'd' on model 'Parent' is unique.",
hint=(
"Add unique=True on any of those fields or add at least "
"a subset of them to a unique_together constraint."
),
obj=field,
id='fields.E310',
),
])
|
b118acdfe68600152565147f58952211059ac695d43f5198412c21c797104d5a | import unittest
from django.conf import settings
from django.core.checks import Error, Warning
from django.core.checks.model_checks import _check_lazy_references
from django.db import connection, connections, models
from django.db.models.functions import Lower
from django.db.models.signals import post_init
from django.test import SimpleTestCase
from django.test.utils import isolate_apps, override_settings, register_lookup
def get_max_column_name_length():
allowed_len = None
db_alias = None
for db in settings.DATABASES:
connection = connections[db]
max_name_length = connection.ops.max_name_length()
if max_name_length is not None and not connection.features.truncates_names:
if allowed_len is None or max_name_length < allowed_len:
allowed_len = max_name_length
db_alias = db
return (allowed_len, db_alias)
@isolate_apps('invalid_models_tests')
class IndexTogetherTests(SimpleTestCase):
def test_non_iterable(self):
class Model(models.Model):
class Meta:
index_together = 42
self.assertEqual(Model.check(), [
Error(
"'index_together' must be a list or tuple.",
obj=Model,
id='models.E008',
),
])
def test_non_list(self):
class Model(models.Model):
class Meta:
index_together = 'not-a-list'
self.assertEqual(Model.check(), [
Error(
"'index_together' must be a list or tuple.",
obj=Model,
id='models.E008',
),
])
def test_list_containing_non_iterable(self):
class Model(models.Model):
class Meta:
index_together = [('a', 'b'), 42]
self.assertEqual(Model.check(), [
Error(
"All 'index_together' elements must be lists or tuples.",
obj=Model,
id='models.E009',
),
])
def test_pointing_to_missing_field(self):
class Model(models.Model):
class Meta:
index_together = [['missing_field']]
self.assertEqual(Model.check(), [
Error(
"'index_together' refers to the nonexistent field 'missing_field'.",
obj=Model,
id='models.E012',
),
])
def test_pointing_to_non_local_field(self):
class Foo(models.Model):
field1 = models.IntegerField()
class Bar(Foo):
field2 = models.IntegerField()
class Meta:
index_together = [['field2', 'field1']]
self.assertEqual(Bar.check(), [
Error(
"'index_together' refers to field 'field1' which is not "
"local to model 'Bar'.",
hint='This issue may be caused by multi-table inheritance.',
obj=Bar,
id='models.E016',
),
])
def test_pointing_to_m2m_field(self):
class Model(models.Model):
m2m = models.ManyToManyField('self')
class Meta:
index_together = [['m2m']]
self.assertEqual(Model.check(), [
Error(
"'index_together' refers to a ManyToManyField 'm2m', but "
"ManyToManyFields are not permitted in 'index_together'.",
obj=Model,
id='models.E013',
),
])
def test_pointing_to_fk(self):
class Foo(models.Model):
pass
class Bar(models.Model):
foo_1 = models.ForeignKey(Foo, on_delete=models.CASCADE, related_name='bar_1')
foo_2 = models.ForeignKey(Foo, on_delete=models.CASCADE, related_name='bar_2')
class Meta:
index_together = [['foo_1_id', 'foo_2']]
self.assertEqual(Bar.check(), [])
# unique_together tests are very similar to index_together tests.
@isolate_apps('invalid_models_tests')
class UniqueTogetherTests(SimpleTestCase):
def test_non_iterable(self):
class Model(models.Model):
class Meta:
unique_together = 42
self.assertEqual(Model.check(), [
Error(
"'unique_together' must be a list or tuple.",
obj=Model,
id='models.E010',
),
])
def test_list_containing_non_iterable(self):
class Model(models.Model):
one = models.IntegerField()
two = models.IntegerField()
class Meta:
unique_together = [('a', 'b'), 42]
self.assertEqual(Model.check(), [
Error(
"All 'unique_together' elements must be lists or tuples.",
obj=Model,
id='models.E011',
),
])
def test_non_list(self):
class Model(models.Model):
class Meta:
unique_together = 'not-a-list'
self.assertEqual(Model.check(), [
Error(
"'unique_together' must be a list or tuple.",
obj=Model,
id='models.E010',
),
])
def test_valid_model(self):
class Model(models.Model):
one = models.IntegerField()
two = models.IntegerField()
class Meta:
# unique_together can be a simple tuple
unique_together = ('one', 'two')
self.assertEqual(Model.check(), [])
def test_pointing_to_missing_field(self):
class Model(models.Model):
class Meta:
unique_together = [['missing_field']]
self.assertEqual(Model.check(), [
Error(
"'unique_together' refers to the nonexistent field 'missing_field'.",
obj=Model,
id='models.E012',
),
])
def test_pointing_to_m2m(self):
class Model(models.Model):
m2m = models.ManyToManyField('self')
class Meta:
unique_together = [['m2m']]
self.assertEqual(Model.check(), [
Error(
"'unique_together' refers to a ManyToManyField 'm2m', but "
"ManyToManyFields are not permitted in 'unique_together'.",
obj=Model,
id='models.E013',
),
])
def test_pointing_to_fk(self):
class Foo(models.Model):
pass
class Bar(models.Model):
foo_1 = models.ForeignKey(Foo, on_delete=models.CASCADE, related_name='bar_1')
foo_2 = models.ForeignKey(Foo, on_delete=models.CASCADE, related_name='bar_2')
class Meta:
unique_together = [['foo_1_id', 'foo_2']]
self.assertEqual(Bar.check(), [])
@isolate_apps('invalid_models_tests')
class IndexesTests(SimpleTestCase):
def test_pointing_to_missing_field(self):
class Model(models.Model):
class Meta:
indexes = [models.Index(fields=['missing_field'], name='name')]
self.assertEqual(Model.check(), [
Error(
"'indexes' refers to the nonexistent field 'missing_field'.",
obj=Model,
id='models.E012',
),
])
def test_pointing_to_m2m_field(self):
class Model(models.Model):
m2m = models.ManyToManyField('self')
class Meta:
indexes = [models.Index(fields=['m2m'], name='name')]
self.assertEqual(Model.check(), [
Error(
"'indexes' refers to a ManyToManyField 'm2m', but "
"ManyToManyFields are not permitted in 'indexes'.",
obj=Model,
id='models.E013',
),
])
def test_pointing_to_non_local_field(self):
class Foo(models.Model):
field1 = models.IntegerField()
class Bar(Foo):
field2 = models.IntegerField()
class Meta:
indexes = [models.Index(fields=['field2', 'field1'], name='name')]
self.assertEqual(Bar.check(), [
Error(
"'indexes' refers to field 'field1' which is not local to "
"model 'Bar'.",
hint='This issue may be caused by multi-table inheritance.',
obj=Bar,
id='models.E016',
),
])
def test_pointing_to_fk(self):
class Foo(models.Model):
pass
class Bar(models.Model):
foo_1 = models.ForeignKey(Foo, on_delete=models.CASCADE, related_name='bar_1')
foo_2 = models.ForeignKey(Foo, on_delete=models.CASCADE, related_name='bar_2')
class Meta:
indexes = [models.Index(fields=['foo_1_id', 'foo_2'], name='index_name')]
self.assertEqual(Bar.check(), [])
def test_name_constraints(self):
class Model(models.Model):
class Meta:
indexes = [
models.Index(fields=['id'], name='_index_name'),
models.Index(fields=['id'], name='5index_name'),
]
self.assertEqual(Model.check(), [
Error(
"The index name '%sindex_name' cannot start with an "
"underscore or a number." % prefix,
obj=Model,
id='models.E033',
) for prefix in ('_', '5')
])
def test_max_name_length(self):
index_name = 'x' * 31
class Model(models.Model):
class Meta:
indexes = [models.Index(fields=['id'], name=index_name)]
self.assertEqual(Model.check(), [
Error(
"The index name '%s' cannot be longer than 30 characters."
% index_name,
obj=Model,
id='models.E034',
),
])
@isolate_apps('invalid_models_tests')
class FieldNamesTests(SimpleTestCase):
def test_ending_with_underscore(self):
class Model(models.Model):
field_ = models.CharField(max_length=10)
m2m_ = models.ManyToManyField('self')
self.assertEqual(Model.check(), [
Error(
'Field names must not end with an underscore.',
obj=Model._meta.get_field('field_'),
id='fields.E001',
),
Error(
'Field names must not end with an underscore.',
obj=Model._meta.get_field('m2m_'),
id='fields.E001',
),
])
max_column_name_length, column_limit_db_alias = get_max_column_name_length()
@unittest.skipIf(max_column_name_length is None, "The database doesn't have a column name length limit.")
def test_M2M_long_column_name(self):
"""
#13711 -- Model check for long M2M column names when database has
column name length limits.
"""
allowed_len, db_alias = get_max_column_name_length()
# A model with very long name which will be used to set relations to.
class VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz(models.Model):
title = models.CharField(max_length=11)
# Main model for which checks will be performed.
class ModelWithLongField(models.Model):
m2m_field = models.ManyToManyField(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
related_name='rn1',
)
m2m_field2 = models.ManyToManyField(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
related_name='rn2', through='m2msimple',
)
m2m_field3 = models.ManyToManyField(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
related_name='rn3',
through='m2mcomplex',
)
fk = models.ForeignKey(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
models.CASCADE,
related_name='rn4',
)
# Models used for setting `through` in M2M field.
class m2msimple(models.Model):
id2 = models.ForeignKey(ModelWithLongField, models.CASCADE)
class m2mcomplex(models.Model):
id2 = models.ForeignKey(ModelWithLongField, models.CASCADE)
long_field_name = 'a' * (self.max_column_name_length + 1)
models.ForeignKey(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
models.CASCADE,
).contribute_to_class(m2msimple, long_field_name)
models.ForeignKey(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
models.CASCADE,
db_column=long_field_name
).contribute_to_class(m2mcomplex, long_field_name)
errors = ModelWithLongField.check()
# First error because of M2M field set on the model with long name.
m2m_long_name = "verylongmodelnamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz_id"
if self.max_column_name_length > len(m2m_long_name):
# Some databases support names longer than the test name.
expected = []
else:
expected = [
Error(
'Autogenerated column name too long for M2M field "%s". '
'Maximum length is "%s" for database "%s".'
% (m2m_long_name, self.max_column_name_length, self.column_limit_db_alias),
hint="Use 'through' to create a separate model for "
"M2M and then set column_name using 'db_column'.",
obj=ModelWithLongField,
id='models.E019',
)
]
# Second error because the FK specified in the `through` model
# `m2msimple` has auto-generated name longer than allowed.
# There will be no check errors in the other M2M because it
# specifies db_column for the FK in `through` model even if the actual
# name is longer than the limits of the database.
expected.append(
Error(
'Autogenerated column name too long for M2M field "%s_id". '
'Maximum length is "%s" for database "%s".'
% (long_field_name, self.max_column_name_length, self.column_limit_db_alias),
hint="Use 'through' to create a separate model for "
"M2M and then set column_name using 'db_column'.",
obj=ModelWithLongField,
id='models.E019',
)
)
self.assertEqual(errors, expected)
@unittest.skipIf(max_column_name_length is None, "The database doesn't have a column name length limit.")
def test_local_field_long_column_name(self):
"""
#13711 -- Model check for long column names
when database does not support long names.
"""
allowed_len, db_alias = get_max_column_name_length()
class ModelWithLongField(models.Model):
title = models.CharField(max_length=11)
long_field_name = 'a' * (self.max_column_name_length + 1)
long_field_name2 = 'b' * (self.max_column_name_length + 1)
models.CharField(max_length=11).contribute_to_class(ModelWithLongField, long_field_name)
models.CharField(max_length=11, db_column='vlmn').contribute_to_class(ModelWithLongField, long_field_name2)
self.assertEqual(ModelWithLongField.check(), [
Error(
'Autogenerated column name too long for field "%s". '
'Maximum length is "%s" for database "%s".'
% (long_field_name, self.max_column_name_length, self.column_limit_db_alias),
hint="Set the column name manually using 'db_column'.",
obj=ModelWithLongField,
id='models.E018',
)
])
def test_including_separator(self):
class Model(models.Model):
some__field = models.IntegerField()
self.assertEqual(Model.check(), [
Error(
'Field names must not contain "__".',
obj=Model._meta.get_field('some__field'),
id='fields.E002',
)
])
def test_pk(self):
class Model(models.Model):
pk = models.IntegerField()
self.assertEqual(Model.check(), [
Error(
"'pk' is a reserved word that cannot be used as a field name.",
obj=Model._meta.get_field('pk'),
id='fields.E003',
)
])
def test_db_column_clash(self):
class Model(models.Model):
foo = models.IntegerField()
bar = models.IntegerField(db_column='foo')
self.assertEqual(Model.check(), [
Error(
"Field 'bar' has column name 'foo' that is used by "
"another field.",
hint="Specify a 'db_column' for the field.",
obj=Model,
id='models.E007',
)
])
@isolate_apps('invalid_models_tests')
class ShadowingFieldsTests(SimpleTestCase):
def test_field_name_clash_with_child_accessor(self):
class Parent(models.Model):
pass
class Child(Parent):
child = models.CharField(max_length=100)
self.assertEqual(Child.check(), [
Error(
"The field 'child' clashes with the field "
"'child' from model 'invalid_models_tests.parent'.",
obj=Child._meta.get_field('child'),
id='models.E006',
)
])
def test_multiinheritance_clash(self):
class Mother(models.Model):
clash = models.IntegerField()
class Father(models.Model):
clash = models.IntegerField()
class Child(Mother, Father):
# Here we have two clashed: id (automatic field) and clash, because
# both parents define these fields.
pass
self.assertEqual(Child.check(), [
Error(
"The field 'id' from parent model "
"'invalid_models_tests.mother' clashes with the field 'id' "
"from parent model 'invalid_models_tests.father'.",
obj=Child,
id='models.E005',
),
Error(
"The field 'clash' from parent model "
"'invalid_models_tests.mother' clashes with the field 'clash' "
"from parent model 'invalid_models_tests.father'.",
obj=Child,
id='models.E005',
)
])
def test_inheritance_clash(self):
class Parent(models.Model):
f_id = models.IntegerField()
class Target(models.Model):
# This field doesn't result in a clash.
f_id = models.IntegerField()
class Child(Parent):
# This field clashes with parent "f_id" field.
f = models.ForeignKey(Target, models.CASCADE)
self.assertEqual(Child.check(), [
Error(
"The field 'f' clashes with the field 'f_id' "
"from model 'invalid_models_tests.parent'.",
obj=Child._meta.get_field('f'),
id='models.E006',
)
])
def test_multigeneration_inheritance(self):
class GrandParent(models.Model):
clash = models.IntegerField()
class Parent(GrandParent):
pass
class Child(Parent):
pass
class GrandChild(Child):
clash = models.IntegerField()
self.assertEqual(GrandChild.check(), [
Error(
"The field 'clash' clashes with the field 'clash' "
"from model 'invalid_models_tests.grandparent'.",
obj=GrandChild._meta.get_field('clash'),
id='models.E006',
)
])
def test_id_clash(self):
class Target(models.Model):
pass
class Model(models.Model):
fk = models.ForeignKey(Target, models.CASCADE)
fk_id = models.IntegerField()
self.assertEqual(Model.check(), [
Error(
"The field 'fk_id' clashes with the field 'fk' from model "
"'invalid_models_tests.model'.",
obj=Model._meta.get_field('fk_id'),
id='models.E006',
)
])
@isolate_apps('invalid_models_tests')
class OtherModelTests(SimpleTestCase):
def test_unique_primary_key(self):
invalid_id = models.IntegerField(primary_key=False)
class Model(models.Model):
id = invalid_id
self.assertEqual(Model.check(), [
Error(
"'id' can only be used as a field name if the field also sets "
"'primary_key=True'.",
obj=Model,
id='models.E004',
),
])
def test_ordering_non_iterable(self):
class Model(models.Model):
class Meta:
ordering = 'missing_field'
self.assertEqual(Model.check(), [
Error(
"'ordering' must be a tuple or list "
"(even if you want to order by only one field).",
obj=Model,
id='models.E014',
),
])
def test_just_ordering_no_errors(self):
class Model(models.Model):
order = models.PositiveIntegerField()
class Meta:
ordering = ['order']
self.assertEqual(Model.check(), [])
def test_just_order_with_respect_to_no_errors(self):
class Question(models.Model):
pass
class Answer(models.Model):
question = models.ForeignKey(Question, models.CASCADE)
class Meta:
order_with_respect_to = 'question'
self.assertEqual(Answer.check(), [])
def test_ordering_with_order_with_respect_to(self):
class Question(models.Model):
pass
class Answer(models.Model):
question = models.ForeignKey(Question, models.CASCADE)
order = models.IntegerField()
class Meta:
order_with_respect_to = 'question'
ordering = ['order']
self.assertEqual(Answer.check(), [
Error(
"'ordering' and 'order_with_respect_to' cannot be used together.",
obj=Answer,
id='models.E021',
),
])
def test_non_valid(self):
class RelationModel(models.Model):
pass
class Model(models.Model):
relation = models.ManyToManyField(RelationModel)
class Meta:
ordering = ['relation']
self.assertEqual(Model.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'relation'.",
obj=Model,
id='models.E015',
),
])
def test_ordering_pointing_to_missing_field(self):
class Model(models.Model):
class Meta:
ordering = ('missing_field',)
self.assertEqual(Model.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'missing_field'.",
obj=Model,
id='models.E015',
)
])
def test_ordering_pointing_to_missing_foreignkey_field(self):
class Model(models.Model):
missing_fk_field = models.IntegerField()
class Meta:
ordering = ('missing_fk_field_id',)
self.assertEqual(Model.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'missing_fk_field_id'.",
obj=Model,
id='models.E015',
)
])
def test_ordering_pointing_to_missing_related_field(self):
class Model(models.Model):
test = models.IntegerField()
class Meta:
ordering = ('missing_related__id',)
self.assertEqual(Model.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'missing_related__id'.",
obj=Model,
id='models.E015',
)
])
def test_ordering_pointing_to_missing_related_model_field(self):
class Parent(models.Model):
pass
class Child(models.Model):
parent = models.ForeignKey(Parent, models.CASCADE)
class Meta:
ordering = ('parent__missing_field',)
self.assertEqual(Child.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'parent__missing_field'.",
obj=Child,
id='models.E015',
)
])
def test_ordering_pointing_to_non_related_field(self):
class Child(models.Model):
parent = models.IntegerField()
class Meta:
ordering = ('parent__missing_field',)
self.assertEqual(Child.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'parent__missing_field'.",
obj=Child,
id='models.E015',
)
])
def test_ordering_pointing_to_two_related_model_field(self):
class Parent2(models.Model):
pass
class Parent1(models.Model):
parent2 = models.ForeignKey(Parent2, models.CASCADE)
class Child(models.Model):
parent1 = models.ForeignKey(Parent1, models.CASCADE)
class Meta:
ordering = ('parent1__parent2__missing_field',)
self.assertEqual(Child.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'parent1__parent2__missing_field'.",
obj=Child,
id='models.E015',
)
])
def test_ordering_pointing_multiple_times_to_model_fields(self):
class Parent(models.Model):
field1 = models.CharField(max_length=100)
field2 = models.CharField(max_length=100)
class Child(models.Model):
parent = models.ForeignKey(Parent, models.CASCADE)
class Meta:
ordering = ('parent__field1__field2',)
self.assertEqual(Child.check(), [
Error(
"'ordering' refers to the nonexistent field, related field, "
"or lookup 'parent__field1__field2'.",
obj=Child,
id='models.E015',
)
])
def test_ordering_allows_registered_lookups(self):
class Model(models.Model):
test = models.CharField(max_length=100)
class Meta:
ordering = ('test__lower',)
with register_lookup(models.CharField, Lower):
self.assertEqual(Model.check(), [])
def test_ordering_pointing_to_related_model_pk(self):
class Parent(models.Model):
pass
class Child(models.Model):
parent = models.ForeignKey(Parent, models.CASCADE)
class Meta:
ordering = ('parent__pk',)
self.assertEqual(Child.check(), [])
def test_ordering_pointing_to_foreignkey_field(self):
class Parent(models.Model):
pass
class Child(models.Model):
parent = models.ForeignKey(Parent, models.CASCADE)
class Meta:
ordering = ('parent_id',)
self.assertFalse(Child.check())
def test_name_beginning_with_underscore(self):
class _Model(models.Model):
pass
self.assertEqual(_Model.check(), [
Error(
"The model name '_Model' cannot start or end with an underscore "
"as it collides with the query lookup syntax.",
obj=_Model,
id='models.E023',
)
])
def test_name_ending_with_underscore(self):
class Model_(models.Model):
pass
self.assertEqual(Model_.check(), [
Error(
"The model name 'Model_' cannot start or end with an underscore "
"as it collides with the query lookup syntax.",
obj=Model_,
id='models.E023',
)
])
def test_name_contains_double_underscores(self):
class Test__Model(models.Model):
pass
self.assertEqual(Test__Model.check(), [
Error(
"The model name 'Test__Model' cannot contain double underscores "
"as it collides with the query lookup syntax.",
obj=Test__Model,
id='models.E024',
)
])
def test_property_and_related_field_accessor_clash(self):
class Model(models.Model):
fk = models.ForeignKey('self', models.CASCADE)
@property
def fk_id(self):
pass
self.assertEqual(Model.check(), [
Error(
"The property 'fk_id' clashes with a related field accessor.",
obj=Model,
id='models.E025',
)
])
def test_single_primary_key(self):
class Model(models.Model):
foo = models.IntegerField(primary_key=True)
bar = models.IntegerField(primary_key=True)
self.assertEqual(Model.check(), [
Error(
"The model cannot have more than one field with 'primary_key=True'.",
obj=Model,
id='models.E026',
)
])
@override_settings(TEST_SWAPPED_MODEL_BAD_VALUE='not-a-model')
def test_swappable_missing_app_name(self):
class Model(models.Model):
class Meta:
swappable = 'TEST_SWAPPED_MODEL_BAD_VALUE'
self.assertEqual(Model.check(), [
Error(
"'TEST_SWAPPED_MODEL_BAD_VALUE' is not of the form 'app_label.app_name'.",
id='models.E001',
),
])
@override_settings(TEST_SWAPPED_MODEL_BAD_MODEL='not_an_app.Target')
def test_swappable_missing_app(self):
class Model(models.Model):
class Meta:
swappable = 'TEST_SWAPPED_MODEL_BAD_MODEL'
self.assertEqual(Model.check(), [
Error(
"'TEST_SWAPPED_MODEL_BAD_MODEL' references 'not_an_app.Target', "
'which has not been installed, or is abstract.',
id='models.E002',
),
])
def test_two_m2m_through_same_relationship(self):
class Person(models.Model):
pass
class Group(models.Model):
primary = models.ManyToManyField(Person, through='Membership', related_name='primary')
secondary = models.ManyToManyField(Person, through='Membership', related_name='secondary')
class Membership(models.Model):
person = models.ForeignKey(Person, models.CASCADE)
group = models.ForeignKey(Group, models.CASCADE)
self.assertEqual(Group.check(), [
Error(
"The model has two identical many-to-many relations through "
"the intermediate model 'invalid_models_tests.Membership'.",
obj=Group,
id='models.E003',
)
])
def test_two_m2m_through_same_model_with_different_through_fields(self):
class Country(models.Model):
pass
class ShippingMethod(models.Model):
to_countries = models.ManyToManyField(
Country, through='ShippingMethodPrice',
through_fields=('method', 'to_country'),
)
from_countries = models.ManyToManyField(
Country, through='ShippingMethodPrice',
through_fields=('method', 'from_country'),
related_name='+',
)
class ShippingMethodPrice(models.Model):
method = models.ForeignKey(ShippingMethod, models.CASCADE)
to_country = models.ForeignKey(Country, models.CASCADE)
from_country = models.ForeignKey(Country, models.CASCADE)
self.assertEqual(ShippingMethod.check(), [])
def test_onetoone_with_parent_model(self):
class Place(models.Model):
pass
class ParkingLot(Place):
other_place = models.OneToOneField(Place, models.CASCADE, related_name='other_parking')
self.assertEqual(ParkingLot.check(), [])
def test_onetoone_with_explicit_parent_link_parent_model(self):
class Place(models.Model):
pass
class ParkingLot(Place):
place = models.OneToOneField(Place, models.CASCADE, parent_link=True, primary_key=True)
other_place = models.OneToOneField(Place, models.CASCADE, related_name='other_parking')
self.assertEqual(ParkingLot.check(), [])
def test_m2m_table_name_clash(self):
class Foo(models.Model):
bar = models.ManyToManyField('Bar', db_table='myapp_bar')
class Meta:
db_table = 'myapp_foo'
class Bar(models.Model):
class Meta:
db_table = 'myapp_bar'
self.assertEqual(Foo.check(), [
Error(
"The field's intermediary table 'myapp_bar' clashes with the "
"table name of 'invalid_models_tests.Bar'.",
obj=Foo._meta.get_field('bar'),
id='fields.E340',
)
])
def test_m2m_field_table_name_clash(self):
class Foo(models.Model):
pass
class Bar(models.Model):
foos = models.ManyToManyField(Foo, db_table='clash')
class Baz(models.Model):
foos = models.ManyToManyField(Foo, db_table='clash')
self.assertEqual(Bar.check() + Baz.check(), [
Error(
"The field's intermediary table 'clash' clashes with the "
"table name of 'invalid_models_tests.Baz.foos'.",
obj=Bar._meta.get_field('foos'),
id='fields.E340',
),
Error(
"The field's intermediary table 'clash' clashes with the "
"table name of 'invalid_models_tests.Bar.foos'.",
obj=Baz._meta.get_field('foos'),
id='fields.E340',
)
])
def test_m2m_autogenerated_table_name_clash(self):
class Foo(models.Model):
class Meta:
db_table = 'bar_foos'
class Bar(models.Model):
# The autogenerated `db_table` will be bar_foos.
foos = models.ManyToManyField(Foo)
class Meta:
db_table = 'bar'
self.assertEqual(Bar.check(), [
Error(
"The field's intermediary table 'bar_foos' clashes with the "
"table name of 'invalid_models_tests.Foo'.",
obj=Bar._meta.get_field('foos'),
id='fields.E340',
)
])
def test_m2m_unmanaged_shadow_models_not_checked(self):
class A1(models.Model):
pass
class C1(models.Model):
mm_a = models.ManyToManyField(A1, db_table='d1')
# Unmanaged models that shadow the above models. Reused table names
# shouldn't be flagged by any checks.
class A2(models.Model):
class Meta:
managed = False
class C2(models.Model):
mm_a = models.ManyToManyField(A2, through='Intermediate')
class Meta:
managed = False
class Intermediate(models.Model):
a2 = models.ForeignKey(A2, models.CASCADE, db_column='a1_id')
c2 = models.ForeignKey(C2, models.CASCADE, db_column='c1_id')
class Meta:
db_table = 'd1'
managed = False
self.assertEqual(C1.check(), [])
self.assertEqual(C2.check(), [])
def test_m2m_to_concrete_and_proxy_allowed(self):
class A(models.Model):
pass
class Through(models.Model):
a = models.ForeignKey('A', models.CASCADE)
c = models.ForeignKey('C', models.CASCADE)
class ThroughProxy(Through):
class Meta:
proxy = True
class C(models.Model):
mm_a = models.ManyToManyField(A, through=Through)
mm_aproxy = models.ManyToManyField(A, through=ThroughProxy, related_name='proxied_m2m')
self.assertEqual(C.check(), [])
@isolate_apps('django.contrib.auth', kwarg_name='apps')
def test_lazy_reference_checks(self, apps):
class DummyModel(models.Model):
author = models.ForeignKey('Author', models.CASCADE)
class Meta:
app_label = 'invalid_models_tests'
class DummyClass:
def __call__(self, **kwargs):
pass
def dummy_method(self):
pass
def dummy_function(*args, **kwargs):
pass
apps.lazy_model_operation(dummy_function, ('auth', 'imaginarymodel'))
apps.lazy_model_operation(dummy_function, ('fanciful_app', 'imaginarymodel'))
post_init.connect(dummy_function, sender='missing-app.Model', apps=apps)
post_init.connect(DummyClass(), sender='missing-app.Model', apps=apps)
post_init.connect(DummyClass().dummy_method, sender='missing-app.Model', apps=apps)
self.assertEqual(_check_lazy_references(apps), [
Error(
"%r contains a lazy reference to auth.imaginarymodel, "
"but app 'auth' doesn't provide model 'imaginarymodel'." % dummy_function,
obj=dummy_function,
id='models.E022',
),
Error(
"%r contains a lazy reference to fanciful_app.imaginarymodel, "
"but app 'fanciful_app' isn't installed." % dummy_function,
obj=dummy_function,
id='models.E022',
),
Error(
"An instance of class 'DummyClass' was connected to "
"the 'post_init' signal with a lazy reference to the sender "
"'missing-app.model', but app 'missing-app' isn't installed.",
hint=None,
obj='invalid_models_tests.test_models',
id='signals.E001',
),
Error(
"Bound method 'DummyClass.dummy_method' was connected to the "
"'post_init' signal with a lazy reference to the sender "
"'missing-app.model', but app 'missing-app' isn't installed.",
hint=None,
obj='invalid_models_tests.test_models',
id='signals.E001',
),
Error(
"The field invalid_models_tests.DummyModel.author was declared "
"with a lazy reference to 'invalid_models_tests.author', but app "
"'invalid_models_tests' isn't installed.",
hint=None,
obj=DummyModel.author.field,
id='fields.E307',
),
Error(
"The function 'dummy_function' was connected to the 'post_init' "
"signal with a lazy reference to the sender "
"'missing-app.model', but app 'missing-app' isn't installed.",
hint=None,
obj='invalid_models_tests.test_models',
id='signals.E001',
),
])
@isolate_apps('invalid_models_tests')
class ConstraintsTests(SimpleTestCase):
def test_check_constraints(self):
class Model(models.Model):
age = models.IntegerField()
class Meta:
constraints = [models.CheckConstraint(check=models.Q(age__gte=18), name='is_adult')]
errors = Model.check()
warn = Warning(
'%s does not support check constraints.' % connection.display_name,
hint=(
"A constraint won't be created. Silence this warning if you "
"don't care about it."
),
obj=Model,
id='models.W027',
)
expected = [] if connection.features.supports_table_check_constraints else [warn, warn]
self.assertCountEqual(errors, expected)
def test_check_constraints_required_db_features(self):
class Model(models.Model):
age = models.IntegerField()
class Meta:
required_db_features = {'supports_table_check_constraints'}
constraints = [models.CheckConstraint(check=models.Q(age__gte=18), name='is_adult')]
self.assertEqual(Model.check(), [])
|
d8af45d5e4a1287583a80c788ba9380f5118d42459ce19bf56b39d7e64af5101 | import os
import tempfile
import uuid
from django.contrib.contenttypes.fields import (
GenericForeignKey, GenericRelation,
)
from django.contrib.contenttypes.models import ContentType
from django.core.files.storage import FileSystemStorage
from django.db import models
from django.db.models.fields.files import ImageFieldFile
from django.utils.translation import gettext_lazy as _
try:
from PIL import Image
except ImportError:
Image = None
class Foo(models.Model):
a = models.CharField(max_length=10)
d = models.DecimalField(max_digits=5, decimal_places=3)
def get_foo():
return Foo.objects.get(id=1).pk
class Bar(models.Model):
b = models.CharField(max_length=10)
a = models.ForeignKey(Foo, models.CASCADE, default=get_foo, related_name='bars')
class Whiz(models.Model):
CHOICES = (
('Group 1', (
(1, 'First'),
(2, 'Second'),
)
),
('Group 2', (
(3, 'Third'),
(4, 'Fourth'),
)
),
(0, 'Other'),
(5, _('translated')),
)
c = models.IntegerField(choices=CHOICES, null=True)
class WhizDelayed(models.Model):
c = models.IntegerField(choices=(), null=True)
# Contrived way of adding choices later.
WhizDelayed._meta.get_field('c').choices = Whiz.CHOICES
class WhizIter(models.Model):
c = models.IntegerField(choices=iter(Whiz.CHOICES), null=True)
class WhizIterEmpty(models.Model):
c = models.CharField(choices=iter(()), blank=True, max_length=1)
class Choiceful(models.Model):
no_choices = models.IntegerField(null=True)
empty_choices = models.IntegerField(choices=(), null=True)
with_choices = models.IntegerField(choices=[(1, 'A')], null=True)
empty_choices_bool = models.BooleanField(choices=())
empty_choices_text = models.TextField(choices=())
class BigD(models.Model):
d = models.DecimalField(max_digits=32, decimal_places=30)
class FloatModel(models.Model):
size = models.FloatField()
class BigS(models.Model):
s = models.SlugField(max_length=255)
class UnicodeSlugField(models.Model):
s = models.SlugField(max_length=255, allow_unicode=True)
class AutoModel(models.Model):
value = models.AutoField(primary_key=True)
class BigAutoModel(models.Model):
value = models.BigAutoField(primary_key=True)
class SmallAutoModel(models.Model):
value = models.SmallAutoField(primary_key=True)
class SmallIntegerModel(models.Model):
value = models.SmallIntegerField()
class IntegerModel(models.Model):
value = models.IntegerField()
class BigIntegerModel(models.Model):
value = models.BigIntegerField()
null_value = models.BigIntegerField(null=True, blank=True)
class PositiveBigIntegerModel(models.Model):
value = models.PositiveBigIntegerField()
class PositiveSmallIntegerModel(models.Model):
value = models.PositiveSmallIntegerField()
class PositiveIntegerModel(models.Model):
value = models.PositiveIntegerField()
class Post(models.Model):
title = models.CharField(max_length=100)
body = models.TextField()
class NullBooleanModel(models.Model):
nbfield = models.BooleanField(null=True, blank=True)
nbfield_old = models.NullBooleanField()
class BooleanModel(models.Model):
bfield = models.BooleanField()
string = models.CharField(max_length=10, default='abc')
class DateTimeModel(models.Model):
d = models.DateField()
dt = models.DateTimeField()
t = models.TimeField()
class DurationModel(models.Model):
field = models.DurationField()
class NullDurationModel(models.Model):
field = models.DurationField(null=True)
class PrimaryKeyCharModel(models.Model):
string = models.CharField(max_length=10, primary_key=True)
class FksToBooleans(models.Model):
"""Model with FKs to models with {Null,}BooleanField's, #15040"""
bf = models.ForeignKey(BooleanModel, models.CASCADE)
nbf = models.ForeignKey(NullBooleanModel, models.CASCADE)
class FkToChar(models.Model):
"""Model with FK to a model with a CharField primary key, #19299"""
out = models.ForeignKey(PrimaryKeyCharModel, models.CASCADE)
class RenamedField(models.Model):
modelname = models.IntegerField(name="fieldname", choices=((1, 'One'),))
class VerboseNameField(models.Model):
id = models.AutoField("verbose pk", primary_key=True)
field1 = models.BigIntegerField("verbose field1")
field2 = models.BooleanField("verbose field2", default=False)
field3 = models.CharField("verbose field3", max_length=10)
field4 = models.DateField("verbose field4")
field5 = models.DateTimeField("verbose field5")
field6 = models.DecimalField("verbose field6", max_digits=6, decimal_places=1)
field7 = models.EmailField("verbose field7")
field8 = models.FileField("verbose field8", upload_to="unused")
field9 = models.FilePathField("verbose field9")
field10 = models.FloatField("verbose field10")
# Don't want to depend on Pillow in this test
# field_image = models.ImageField("verbose field")
field11 = models.IntegerField("verbose field11")
field12 = models.GenericIPAddressField("verbose field12", protocol="ipv4")
field13 = models.NullBooleanField("verbose field13")
field14 = models.PositiveIntegerField("verbose field14")
field15 = models.PositiveSmallIntegerField("verbose field15")
field16 = models.SlugField("verbose field16")
field17 = models.SmallIntegerField("verbose field17")
field18 = models.TextField("verbose field18")
field19 = models.TimeField("verbose field19")
field20 = models.URLField("verbose field20")
field21 = models.UUIDField("verbose field21")
field22 = models.DurationField("verbose field22")
class GenericIPAddress(models.Model):
ip = models.GenericIPAddressField(null=True, protocol='ipv4')
###############################################################################
# These models aren't used in any test, just here to ensure they validate
# successfully.
# See ticket #16570.
class DecimalLessThanOne(models.Model):
d = models.DecimalField(max_digits=3, decimal_places=3)
# See ticket #18389.
class FieldClassAttributeModel(models.Model):
field_class = models.CharField
###############################################################################
class DataModel(models.Model):
short_data = models.BinaryField(max_length=10, default=b'\x08')
data = models.BinaryField()
###############################################################################
# FileField
class Document(models.Model):
myfile = models.FileField(upload_to='unused', unique=True)
###############################################################################
# ImageField
# If Pillow available, do these tests.
if Image:
class TestImageFieldFile(ImageFieldFile):
"""
Custom Field File class that records whether or not the underlying file
was opened.
"""
def __init__(self, *args, **kwargs):
self.was_opened = False
super().__init__(*args, **kwargs)
def open(self):
self.was_opened = True
super().open()
class TestImageField(models.ImageField):
attr_class = TestImageFieldFile
# Set up a temp directory for file storage.
temp_storage_dir = tempfile.mkdtemp()
temp_storage = FileSystemStorage(temp_storage_dir)
temp_upload_to_dir = os.path.join(temp_storage.location, 'tests')
class Person(models.Model):
"""
Model that defines an ImageField with no dimension fields.
"""
name = models.CharField(max_length=50)
mugshot = TestImageField(storage=temp_storage, upload_to='tests')
class AbstractPersonWithHeight(models.Model):
"""
Abstract model that defines an ImageField with only one dimension field
to make sure the dimension update is correctly run on concrete subclass
instance post-initialization.
"""
mugshot = TestImageField(storage=temp_storage, upload_to='tests',
height_field='mugshot_height')
mugshot_height = models.PositiveSmallIntegerField()
class Meta:
abstract = True
class PersonWithHeight(AbstractPersonWithHeight):
"""
Concrete model that subclass an abstract one with only on dimension
field.
"""
name = models.CharField(max_length=50)
class PersonWithHeightAndWidth(models.Model):
"""
Model that defines height and width fields after the ImageField.
"""
name = models.CharField(max_length=50)
mugshot = TestImageField(storage=temp_storage, upload_to='tests',
height_field='mugshot_height',
width_field='mugshot_width')
mugshot_height = models.PositiveSmallIntegerField()
mugshot_width = models.PositiveSmallIntegerField()
class PersonDimensionsFirst(models.Model):
"""
Model that defines height and width fields before the ImageField.
"""
name = models.CharField(max_length=50)
mugshot_height = models.PositiveSmallIntegerField()
mugshot_width = models.PositiveSmallIntegerField()
mugshot = TestImageField(storage=temp_storage, upload_to='tests',
height_field='mugshot_height',
width_field='mugshot_width')
class PersonTwoImages(models.Model):
"""
Model that:
* Defines two ImageFields
* Defines the height/width fields before the ImageFields
* Has a nullable ImageField
"""
name = models.CharField(max_length=50)
mugshot_height = models.PositiveSmallIntegerField()
mugshot_width = models.PositiveSmallIntegerField()
mugshot = TestImageField(storage=temp_storage, upload_to='tests',
height_field='mugshot_height',
width_field='mugshot_width')
headshot_height = models.PositiveSmallIntegerField(
blank=True, null=True)
headshot_width = models.PositiveSmallIntegerField(
blank=True, null=True)
headshot = TestImageField(blank=True, null=True,
storage=temp_storage, upload_to='tests',
height_field='headshot_height',
width_field='headshot_width')
class AllFieldsModel(models.Model):
big_integer = models.BigIntegerField()
binary = models.BinaryField()
boolean = models.BooleanField(default=False)
char = models.CharField(max_length=10)
date = models.DateField()
datetime = models.DateTimeField()
decimal = models.DecimalField(decimal_places=2, max_digits=2)
duration = models.DurationField()
email = models.EmailField()
file_path = models.FilePathField()
floatf = models.FloatField()
integer = models.IntegerField()
generic_ip = models.GenericIPAddressField()
null_boolean = models.NullBooleanField()
positive_integer = models.PositiveIntegerField()
positive_small_integer = models.PositiveSmallIntegerField()
slug = models.SlugField()
small_integer = models.SmallIntegerField()
text = models.TextField()
time = models.TimeField()
url = models.URLField()
uuid = models.UUIDField()
fo = models.ForeignObject(
'self',
on_delete=models.CASCADE,
from_fields=['positive_integer'],
to_fields=['id'],
related_name='reverse'
)
fk = models.ForeignKey(
'self',
models.CASCADE,
related_name='reverse2'
)
m2m = models.ManyToManyField('self')
oto = models.OneToOneField('self', models.CASCADE)
object_id = models.PositiveIntegerField()
content_type = models.ForeignKey(ContentType, models.CASCADE)
gfk = GenericForeignKey()
gr = GenericRelation(DataModel)
class ManyToMany(models.Model):
m2m = models.ManyToManyField('self')
###############################################################################
class UUIDModel(models.Model):
field = models.UUIDField()
class NullableUUIDModel(models.Model):
field = models.UUIDField(blank=True, null=True)
class PrimaryKeyUUIDModel(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4)
class RelatedToUUIDModel(models.Model):
uuid_fk = models.ForeignKey('PrimaryKeyUUIDModel', models.CASCADE)
class UUIDChild(PrimaryKeyUUIDModel):
pass
class UUIDGrandchild(UUIDChild):
pass
|
6988fe9c07410695420fda09a21ed86251f2cd783cd319d8c5d1b3c77f23dada | import datetime
import pickle
import unittest
import uuid
from copy import deepcopy
from unittest import mock
from django.core.exceptions import FieldError
from django.db import DatabaseError, connection
from django.db.models import (
Avg, BooleanField, Case, CharField, Count, DateField, DateTimeField,
DurationField, Exists, Expression, ExpressionList, ExpressionWrapper, F,
Func, IntegerField, Max, Min, Model, OrderBy, OuterRef, Q, StdDev,
Subquery, Sum, TimeField, UUIDField, Value, Variance, When,
)
from django.db.models.expressions import Col, Combinable, Random, RawSQL, Ref
from django.db.models.functions import (
Coalesce, Concat, Length, Lower, Substr, Upper,
)
from django.db.models.sql import constants
from django.db.models.sql.datastructures import Join
from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
from django.test.utils import Approximate, isolate_apps
from .models import (
UUID, UUIDPK, Company, Employee, Experiment, Number, RemoteEmployee,
Result, SimulationRun, Time,
)
class BasicExpressionsTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.example_inc = Company.objects.create(
name="Example Inc.", num_employees=2300, num_chairs=5,
ceo=Employee.objects.create(firstname="Joe", lastname="Smith", salary=10)
)
cls.foobar_ltd = Company.objects.create(
name="Foobar Ltd.", num_employees=3, num_chairs=4, based_in_eu=True,
ceo=Employee.objects.create(firstname="Frank", lastname="Meyer", salary=20)
)
cls.max = Employee.objects.create(firstname='Max', lastname='Mustermann', salary=30)
cls.gmbh = Company.objects.create(name='Test GmbH', num_employees=32, num_chairs=1, ceo=cls.max)
def setUp(self):
self.company_query = Company.objects.values(
"name", "num_employees", "num_chairs"
).order_by(
"name", "num_employees", "num_chairs"
)
def test_annotate_values_aggregate(self):
companies = Company.objects.annotate(
salaries=F('ceo__salary'),
).values('num_employees', 'salaries').aggregate(
result=Sum(
F('salaries') + F('num_employees'),
output_field=IntegerField()
),
)
self.assertEqual(companies['result'], 2395)
def test_annotate_values_filter(self):
companies = Company.objects.annotate(
foo=RawSQL('%s', ['value']),
).filter(foo='value').order_by('name')
self.assertQuerysetEqual(
companies,
['<Company: Example Inc.>', '<Company: Foobar Ltd.>', '<Company: Test GmbH>'],
)
def test_annotate_values_count(self):
companies = Company.objects.annotate(foo=RawSQL('%s', ['value']))
self.assertEqual(companies.count(), 3)
@skipUnlessDBFeature('supports_boolean_expr_in_select_clause')
def test_filtering_on_annotate_that_uses_q(self):
self.assertEqual(
Company.objects.annotate(
num_employees_check=ExpressionWrapper(Q(num_employees__gt=3), output_field=BooleanField())
).filter(num_employees_check=True).count(),
2,
)
def test_filtering_on_q_that_is_boolean(self):
self.assertEqual(
Company.objects.filter(
ExpressionWrapper(Q(num_employees__gt=3), output_field=BooleanField())
).count(),
2,
)
def test_filtering_on_rawsql_that_is_boolean(self):
self.assertEqual(
Company.objects.filter(
RawSQL('num_employees > %s', (3,), output_field=BooleanField()),
).count(),
2,
)
def test_filter_inter_attribute(self):
# We can filter on attribute relationships on same model obj, e.g.
# find companies where the number of employees is greater
# than the number of chairs.
self.assertSequenceEqual(
self.company_query.filter(num_employees__gt=F("num_chairs")), [
{
"num_chairs": 5,
"name": "Example Inc.",
"num_employees": 2300,
},
{
"num_chairs": 1,
"name": "Test GmbH",
"num_employees": 32
},
],
)
def test_update(self):
# We can set one field to have the value of another field
# Make sure we have enough chairs
self.company_query.update(num_chairs=F("num_employees"))
self.assertSequenceEqual(
self.company_query, [
{
"num_chairs": 2300,
"name": "Example Inc.",
"num_employees": 2300
},
{
"num_chairs": 3,
"name": "Foobar Ltd.",
"num_employees": 3
},
{
"num_chairs": 32,
"name": "Test GmbH",
"num_employees": 32
}
],
)
def test_arithmetic(self):
# We can perform arithmetic operations in expressions
# Make sure we have 2 spare chairs
self.company_query.update(num_chairs=F("num_employees") + 2)
self.assertSequenceEqual(
self.company_query, [
{
'num_chairs': 2302,
'name': 'Example Inc.',
'num_employees': 2300
},
{
'num_chairs': 5,
'name': 'Foobar Ltd.',
'num_employees': 3
},
{
'num_chairs': 34,
'name': 'Test GmbH',
'num_employees': 32
}
],
)
def test_order_of_operations(self):
# Law of order of operations is followed
self.company_query.update(num_chairs=F('num_employees') + 2 * F('num_employees'))
self.assertSequenceEqual(
self.company_query, [
{
'num_chairs': 6900,
'name': 'Example Inc.',
'num_employees': 2300
},
{
'num_chairs': 9,
'name': 'Foobar Ltd.',
'num_employees': 3
},
{
'num_chairs': 96,
'name': 'Test GmbH',
'num_employees': 32
}
],
)
def test_parenthesis_priority(self):
# Law of order of operations can be overridden by parentheses
self.company_query.update(num_chairs=(F('num_employees') + 2) * F('num_employees'))
self.assertSequenceEqual(
self.company_query, [
{
'num_chairs': 5294600,
'name': 'Example Inc.',
'num_employees': 2300
},
{
'num_chairs': 15,
'name': 'Foobar Ltd.',
'num_employees': 3
},
{
'num_chairs': 1088,
'name': 'Test GmbH',
'num_employees': 32
}
],
)
def test_update_with_fk(self):
# ForeignKey can become updated with the value of another ForeignKey.
self.assertEqual(Company.objects.update(point_of_contact=F('ceo')), 3)
self.assertQuerysetEqual(
Company.objects.all(),
['Joe Smith', 'Frank Meyer', 'Max Mustermann'],
lambda c: str(c.point_of_contact),
ordered=False
)
def test_update_with_none(self):
Number.objects.create(integer=1, float=1.0)
Number.objects.create(integer=2)
Number.objects.filter(float__isnull=False).update(float=Value(None))
self.assertQuerysetEqual(
Number.objects.all(),
[None, None],
lambda n: n.float,
ordered=False
)
def test_filter_with_join(self):
# F Expressions can also span joins
Company.objects.update(point_of_contact=F('ceo'))
c = Company.objects.first()
c.point_of_contact = Employee.objects.create(firstname="Guido", lastname="van Rossum")
c.save()
self.assertQuerysetEqual(
Company.objects.filter(ceo__firstname=F('point_of_contact__firstname')),
['Foobar Ltd.', 'Test GmbH'],
lambda c: c.name,
ordered=False
)
Company.objects.exclude(
ceo__firstname=F("point_of_contact__firstname")
).update(name="foo")
self.assertEqual(
Company.objects.exclude(
ceo__firstname=F('point_of_contact__firstname')
).get().name,
"foo",
)
msg = "Joined field references are not permitted in this query"
with self.assertRaisesMessage(FieldError, msg):
Company.objects.exclude(
ceo__firstname=F('point_of_contact__firstname')
).update(name=F('point_of_contact__lastname'))
def test_object_update(self):
# F expressions can be used to update attributes on single objects
self.gmbh.num_employees = F('num_employees') + 4
self.gmbh.save()
self.gmbh.refresh_from_db()
self.assertEqual(self.gmbh.num_employees, 36)
def test_new_object_save(self):
# We should be able to use Funcs when inserting new data
test_co = Company(name=Lower(Value('UPPER')), num_employees=32, num_chairs=1, ceo=self.max)
test_co.save()
test_co.refresh_from_db()
self.assertEqual(test_co.name, "upper")
def test_new_object_create(self):
test_co = Company.objects.create(name=Lower(Value('UPPER')), num_employees=32, num_chairs=1, ceo=self.max)
test_co.refresh_from_db()
self.assertEqual(test_co.name, "upper")
def test_object_create_with_aggregate(self):
# Aggregates are not allowed when inserting new data
msg = 'Aggregate functions are not allowed in this query (num_employees=Max(Value(1))).'
with self.assertRaisesMessage(FieldError, msg):
Company.objects.create(
name='Company', num_employees=Max(Value(1)), num_chairs=1,
ceo=Employee.objects.create(firstname="Just", lastname="Doit", salary=30),
)
def test_object_update_fk(self):
# F expressions cannot be used to update attributes which are foreign
# keys, or attributes which involve joins.
test_gmbh = Company.objects.get(pk=self.gmbh.pk)
msg = 'F(ceo)": "Company.point_of_contact" must be a "Employee" instance.'
with self.assertRaisesMessage(ValueError, msg):
test_gmbh.point_of_contact = F('ceo')
test_gmbh.point_of_contact = self.gmbh.ceo
test_gmbh.save()
test_gmbh.name = F('ceo__lastname')
msg = 'Joined field references are not permitted in this query'
with self.assertRaisesMessage(FieldError, msg):
test_gmbh.save()
def test_update_inherited_field_value(self):
msg = 'Joined field references are not permitted in this query'
with self.assertRaisesMessage(FieldError, msg):
RemoteEmployee.objects.update(adjusted_salary=F('salary') * 5)
def test_object_update_unsaved_objects(self):
# F expressions cannot be used to update attributes on objects which do
# not yet exist in the database
acme = Company(name='The Acme Widget Co.', num_employees=12, num_chairs=5, ceo=self.max)
acme.num_employees = F("num_employees") + 16
msg = (
'Failed to insert expression "Col(expressions_company, '
'expressions.Company.num_employees) + Value(16)" on '
'expressions.Company.num_employees. F() expressions can only be '
'used to update, not to insert.'
)
with self.assertRaisesMessage(ValueError, msg):
acme.save()
acme.num_employees = 12
acme.name = Lower(F('name'))
msg = (
'Failed to insert expression "Lower(Col(expressions_company, '
'expressions.Company.name))" on expressions.Company.name. F() '
'expressions can only be used to update, not to insert.'
)
with self.assertRaisesMessage(ValueError, msg):
acme.save()
def test_ticket_11722_iexact_lookup(self):
Employee.objects.create(firstname="John", lastname="Doe")
Employee.objects.create(firstname="Test", lastname="test")
queryset = Employee.objects.filter(firstname__iexact=F('lastname'))
self.assertQuerysetEqual(queryset, ["<Employee: Test test>"])
def test_ticket_16731_startswith_lookup(self):
Employee.objects.create(firstname="John", lastname="Doe")
e2 = Employee.objects.create(firstname="Jack", lastname="Jackson")
e3 = Employee.objects.create(firstname="Jack", lastname="jackson")
self.assertSequenceEqual(
Employee.objects.filter(lastname__startswith=F('firstname')),
[e2, e3] if connection.features.has_case_insensitive_like else [e2]
)
qs = Employee.objects.filter(lastname__istartswith=F('firstname')).order_by('pk')
self.assertSequenceEqual(qs, [e2, e3])
def test_ticket_18375_join_reuse(self):
# Reverse multijoin F() references and the lookup target the same join.
# Pre #18375 the F() join was generated first and the lookup couldn't
# reuse that join.
qs = Employee.objects.filter(company_ceo_set__num_chairs=F('company_ceo_set__num_employees'))
self.assertEqual(str(qs.query).count('JOIN'), 1)
def test_ticket_18375_kwarg_ordering(self):
# The next query was dict-randomization dependent - if the "gte=1"
# was seen first, then the F() will reuse the join generated by the
# gte lookup, if F() was seen first, then it generated a join the
# other lookups could not reuse.
qs = Employee.objects.filter(
company_ceo_set__num_chairs=F('company_ceo_set__num_employees'),
company_ceo_set__num_chairs__gte=1,
)
self.assertEqual(str(qs.query).count('JOIN'), 1)
def test_ticket_18375_kwarg_ordering_2(self):
# Another similar case for F() than above. Now we have the same join
# in two filter kwargs, one in the lhs lookup, one in F. Here pre
# #18375 the amount of joins generated was random if dict
# randomization was enabled, that is the generated query dependent
# on which clause was seen first.
qs = Employee.objects.filter(
company_ceo_set__num_employees=F('pk'),
pk=F('company_ceo_set__num_employees')
)
self.assertEqual(str(qs.query).count('JOIN'), 1)
def test_ticket_18375_chained_filters(self):
# F() expressions do not reuse joins from previous filter.
qs = Employee.objects.filter(
company_ceo_set__num_employees=F('pk')
).filter(
company_ceo_set__num_employees=F('company_ceo_set__num_employees')
)
self.assertEqual(str(qs.query).count('JOIN'), 2)
def test_order_by_exists(self):
mary = Employee.objects.create(firstname='Mary', lastname='Mustermann', salary=20)
mustermanns_by_seniority = Employee.objects.filter(lastname='Mustermann').order_by(
# Order by whether the employee is the CEO of a company
Exists(Company.objects.filter(ceo=OuterRef('pk'))).desc()
)
self.assertSequenceEqual(mustermanns_by_seniority, [self.max, mary])
def test_order_by_multiline_sql(self):
raw_order_by = (
RawSQL('''
CASE WHEN num_employees > 1000
THEN num_chairs
ELSE 0 END
''', []).desc(),
RawSQL('''
CASE WHEN num_chairs > 1
THEN 1
ELSE 0 END
''', []).asc()
)
for qs in (
Company.objects.all(),
Company.objects.distinct(),
):
with self.subTest(qs=qs):
self.assertSequenceEqual(
qs.order_by(*raw_order_by),
[self.example_inc, self.gmbh, self.foobar_ltd],
)
def test_outerref(self):
inner = Company.objects.filter(point_of_contact=OuterRef('pk'))
msg = (
'This queryset contains a reference to an outer query and may only '
'be used in a subquery.'
)
with self.assertRaisesMessage(ValueError, msg):
inner.exists()
outer = Employee.objects.annotate(is_point_of_contact=Exists(inner))
self.assertIs(outer.exists(), True)
def test_exist_single_field_output_field(self):
queryset = Company.objects.values('pk')
self.assertIsInstance(Exists(queryset).output_field, BooleanField)
def test_subquery(self):
Company.objects.filter(name='Example Inc.').update(
point_of_contact=Employee.objects.get(firstname='Joe', lastname='Smith'),
ceo=self.max,
)
Employee.objects.create(firstname='Bob', lastname='Brown', salary=40)
qs = Employee.objects.annotate(
is_point_of_contact=Exists(Company.objects.filter(point_of_contact=OuterRef('pk'))),
is_not_point_of_contact=~Exists(Company.objects.filter(point_of_contact=OuterRef('pk'))),
is_ceo_of_small_company=Exists(Company.objects.filter(num_employees__lt=200, ceo=OuterRef('pk'))),
is_ceo_small_2=~~Exists(Company.objects.filter(num_employees__lt=200, ceo=OuterRef('pk'))),
largest_company=Subquery(Company.objects.order_by('-num_employees').filter(
Q(ceo=OuterRef('pk')) | Q(point_of_contact=OuterRef('pk'))
).values('name')[:1], output_field=CharField())
).values(
'firstname',
'is_point_of_contact',
'is_not_point_of_contact',
'is_ceo_of_small_company',
'is_ceo_small_2',
'largest_company',
).order_by('firstname')
results = list(qs)
# Could use Coalesce(subq, Value('')) instead except for the bug in
# cx_Oracle mentioned in #23843.
bob = results[0]
if bob['largest_company'] == '' and connection.features.interprets_empty_strings_as_nulls:
bob['largest_company'] = None
self.assertEqual(results, [
{
'firstname': 'Bob',
'is_point_of_contact': False,
'is_not_point_of_contact': True,
'is_ceo_of_small_company': False,
'is_ceo_small_2': False,
'largest_company': None,
},
{
'firstname': 'Frank',
'is_point_of_contact': False,
'is_not_point_of_contact': True,
'is_ceo_of_small_company': True,
'is_ceo_small_2': True,
'largest_company': 'Foobar Ltd.',
},
{
'firstname': 'Joe',
'is_point_of_contact': True,
'is_not_point_of_contact': False,
'is_ceo_of_small_company': False,
'is_ceo_small_2': False,
'largest_company': 'Example Inc.',
},
{
'firstname': 'Max',
'is_point_of_contact': False,
'is_not_point_of_contact': True,
'is_ceo_of_small_company': True,
'is_ceo_small_2': True,
'largest_company': 'Example Inc.'
}
])
# A less elegant way to write the same query: this uses a LEFT OUTER
# JOIN and an IS NULL, inside a WHERE NOT IN which is probably less
# efficient than EXISTS.
self.assertCountEqual(
qs.filter(is_point_of_contact=True).values('pk'),
Employee.objects.exclude(company_point_of_contact_set=None).values('pk')
)
def test_in_subquery(self):
# This is a contrived test (and you really wouldn't write this query),
# but it is a succinct way to test the __in=Subquery() construct.
small_companies = Company.objects.filter(num_employees__lt=200).values('pk')
subquery_test = Company.objects.filter(pk__in=Subquery(small_companies))
self.assertCountEqual(subquery_test, [self.foobar_ltd, self.gmbh])
subquery_test2 = Company.objects.filter(pk=Subquery(small_companies.filter(num_employees=3)))
self.assertCountEqual(subquery_test2, [self.foobar_ltd])
def test_uuid_pk_subquery(self):
u = UUIDPK.objects.create()
UUID.objects.create(uuid_fk=u)
qs = UUIDPK.objects.filter(id__in=Subquery(UUID.objects.values('uuid_fk__id')))
self.assertCountEqual(qs, [u])
def test_nested_subquery(self):
inner = Company.objects.filter(point_of_contact=OuterRef('pk'))
outer = Employee.objects.annotate(is_point_of_contact=Exists(inner))
contrived = Employee.objects.annotate(
is_point_of_contact=Subquery(
outer.filter(pk=OuterRef('pk')).values('is_point_of_contact'),
output_field=BooleanField(),
),
)
self.assertCountEqual(contrived.values_list(), outer.values_list())
def test_nested_subquery_join_outer_ref(self):
inner = Employee.objects.filter(pk=OuterRef('ceo__pk')).values('pk')
qs = Employee.objects.annotate(
ceo_company=Subquery(
Company.objects.filter(
ceo__in=inner,
ceo__pk=OuterRef('pk'),
).values('pk'),
),
)
self.assertSequenceEqual(
qs.values_list('ceo_company', flat=True),
[self.example_inc.pk, self.foobar_ltd.pk, self.gmbh.pk],
)
def test_nested_subquery_outer_ref_2(self):
first = Time.objects.create(time='09:00')
second = Time.objects.create(time='17:00')
third = Time.objects.create(time='21:00')
SimulationRun.objects.bulk_create([
SimulationRun(start=first, end=second, midpoint='12:00'),
SimulationRun(start=first, end=third, midpoint='15:00'),
SimulationRun(start=second, end=first, midpoint='00:00'),
])
inner = Time.objects.filter(time=OuterRef(OuterRef('time')), pk=OuterRef('start')).values('time')
middle = SimulationRun.objects.annotate(other=Subquery(inner)).values('other')[:1]
outer = Time.objects.annotate(other=Subquery(middle, output_field=TimeField()))
# This is a contrived example. It exercises the double OuterRef form.
self.assertCountEqual(outer, [first, second, third])
def test_nested_subquery_outer_ref_with_autofield(self):
first = Time.objects.create(time='09:00')
second = Time.objects.create(time='17:00')
SimulationRun.objects.create(start=first, end=second, midpoint='12:00')
inner = SimulationRun.objects.filter(start=OuterRef(OuterRef('pk'))).values('start')
middle = Time.objects.annotate(other=Subquery(inner)).values('other')[:1]
outer = Time.objects.annotate(other=Subquery(middle, output_field=IntegerField()))
# This exercises the double OuterRef form with AutoField as pk.
self.assertCountEqual(outer, [first, second])
def test_annotations_within_subquery(self):
Company.objects.filter(num_employees__lt=50).update(ceo=Employee.objects.get(firstname='Frank'))
inner = Company.objects.filter(
ceo=OuterRef('pk')
).values('ceo').annotate(total_employees=Sum('num_employees')).values('total_employees')
outer = Employee.objects.annotate(total_employees=Subquery(inner)).filter(salary__lte=Subquery(inner))
self.assertSequenceEqual(
outer.order_by('-total_employees').values('salary', 'total_employees'),
[{'salary': 10, 'total_employees': 2300}, {'salary': 20, 'total_employees': 35}],
)
def test_subquery_references_joined_table_twice(self):
inner = Company.objects.filter(
num_chairs__gte=OuterRef('ceo__salary'),
num_employees__gte=OuterRef('point_of_contact__salary'),
)
# Another contrived example (there is no need to have a subquery here)
outer = Company.objects.filter(pk__in=Subquery(inner.values('pk')))
self.assertFalse(outer.exists())
def test_subquery_filter_by_aggregate(self):
Number.objects.create(integer=1000, float=1.2)
Employee.objects.create(salary=1000)
qs = Number.objects.annotate(
min_valuable_count=Subquery(
Employee.objects.filter(
salary=OuterRef('integer'),
).annotate(cnt=Count('salary')).filter(cnt__gt=0).values('cnt')[:1]
),
)
self.assertEqual(qs.get().float, 1.2)
def test_aggregate_subquery_annotation(self):
with self.assertNumQueries(1) as ctx:
aggregate = Company.objects.annotate(
ceo_salary=Subquery(
Employee.objects.filter(
id=OuterRef('ceo_id'),
).values('salary')
),
).aggregate(
ceo_salary_gt_20=Count('pk', filter=Q(ceo_salary__gt=20)),
)
self.assertEqual(aggregate, {'ceo_salary_gt_20': 1})
# Aggregation over a subquery annotation doesn't annotate the subquery
# twice in the inner query.
sql = ctx.captured_queries[0]['sql']
self.assertLessEqual(sql.count('SELECT'), 3)
# GROUP BY isn't required to aggregate over a query that doesn't
# contain nested aggregates.
self.assertNotIn('GROUP BY', sql)
def test_explicit_output_field(self):
class FuncA(Func):
output_field = CharField()
class FuncB(Func):
pass
expr = FuncB(FuncA())
self.assertEqual(expr.output_field, FuncA.output_field)
def test_outerref_mixed_case_table_name(self):
inner = Result.objects.filter(result_time__gte=OuterRef('experiment__assigned'))
outer = Result.objects.filter(pk__in=Subquery(inner.values('pk')))
self.assertFalse(outer.exists())
def test_outerref_with_operator(self):
inner = Company.objects.filter(num_employees=OuterRef('ceo__salary') + 2)
outer = Company.objects.filter(pk__in=Subquery(inner.values('pk')))
self.assertEqual(outer.get().name, 'Test GmbH')
def test_annotation_with_outerref(self):
gmbh_salary = Company.objects.annotate(
max_ceo_salary_raise=Subquery(
Company.objects.annotate(
salary_raise=OuterRef('num_employees') + F('num_employees'),
).order_by('-salary_raise').values('salary_raise')[:1],
output_field=IntegerField(),
),
).get(pk=self.gmbh.pk)
self.assertEqual(gmbh_salary.max_ceo_salary_raise, 2332)
def test_pickle_expression(self):
expr = Value(1, output_field=IntegerField())
expr.convert_value # populate cached property
self.assertEqual(pickle.loads(pickle.dumps(expr)), expr)
def test_incorrect_field_in_F_expression(self):
with self.assertRaisesMessage(FieldError, "Cannot resolve keyword 'nope' into field."):
list(Employee.objects.filter(firstname=F('nope')))
def test_incorrect_joined_field_in_F_expression(self):
with self.assertRaisesMessage(FieldError, "Cannot resolve keyword 'nope' into field."):
list(Company.objects.filter(ceo__pk=F('point_of_contact__nope')))
def test_exists_in_filter(self):
inner = Company.objects.filter(ceo=OuterRef('pk')).values('pk')
qs1 = Employee.objects.filter(Exists(inner))
qs2 = Employee.objects.annotate(found=Exists(inner)).filter(found=True)
self.assertCountEqual(qs1, qs2)
self.assertFalse(Employee.objects.exclude(Exists(inner)).exists())
self.assertCountEqual(qs2, Employee.objects.exclude(~Exists(inner)))
def test_subquery_in_filter(self):
inner = Company.objects.filter(ceo=OuterRef('pk')).values('based_in_eu')
self.assertSequenceEqual(
Employee.objects.filter(Subquery(inner)),
[self.foobar_ltd.ceo],
)
def test_case_in_filter_if_boolean_output_field(self):
is_ceo = Company.objects.filter(ceo=OuterRef('pk'))
is_poc = Company.objects.filter(point_of_contact=OuterRef('pk'))
qs = Employee.objects.filter(
Case(
When(Exists(is_ceo), then=True),
When(Exists(is_poc), then=True),
default=False,
output_field=BooleanField(),
),
)
self.assertSequenceEqual(qs, [self.example_inc.ceo, self.foobar_ltd.ceo, self.max])
def test_boolean_expression_combined(self):
is_ceo = Company.objects.filter(ceo=OuterRef('pk'))
is_poc = Company.objects.filter(point_of_contact=OuterRef('pk'))
self.gmbh.point_of_contact = self.max
self.gmbh.save()
self.assertSequenceEqual(
Employee.objects.filter(Exists(is_ceo) | Exists(is_poc)),
[self.example_inc.ceo, self.foobar_ltd.ceo, self.max],
)
self.assertSequenceEqual(
Employee.objects.filter(Exists(is_ceo) & Exists(is_poc)),
[self.max],
)
self.assertSequenceEqual(
Employee.objects.filter(Exists(is_ceo) & Q(salary__gte=30)),
[self.max],
)
self.assertSequenceEqual(
Employee.objects.filter(Exists(is_poc) | Q(salary__lt=15)),
[self.example_inc.ceo, self.max],
)
class IterableLookupInnerExpressionsTests(TestCase):
@classmethod
def setUpTestData(cls):
ceo = Employee.objects.create(firstname='Just', lastname='Doit', salary=30)
# MySQL requires that the values calculated for expressions don't pass
# outside of the field's range, so it's inconvenient to use the values
# in the more general tests.
Company.objects.create(name='5020 Ltd', num_employees=50, num_chairs=20, ceo=ceo)
Company.objects.create(name='5040 Ltd', num_employees=50, num_chairs=40, ceo=ceo)
Company.objects.create(name='5050 Ltd', num_employees=50, num_chairs=50, ceo=ceo)
Company.objects.create(name='5060 Ltd', num_employees=50, num_chairs=60, ceo=ceo)
Company.objects.create(name='99300 Ltd', num_employees=99, num_chairs=300, ceo=ceo)
def test_in_lookup_allows_F_expressions_and_expressions_for_integers(self):
# __in lookups can use F() expressions for integers.
queryset = Company.objects.filter(num_employees__in=([F('num_chairs') - 10]))
self.assertQuerysetEqual(queryset, ['<Company: 5060 Ltd>'], ordered=False)
self.assertQuerysetEqual(
Company.objects.filter(num_employees__in=([F('num_chairs') - 10, F('num_chairs') + 10])),
['<Company: 5040 Ltd>', '<Company: 5060 Ltd>'],
ordered=False
)
self.assertQuerysetEqual(
Company.objects.filter(
num_employees__in=([F('num_chairs') - 10, F('num_chairs'), F('num_chairs') + 10])
),
['<Company: 5040 Ltd>', '<Company: 5050 Ltd>', '<Company: 5060 Ltd>'],
ordered=False
)
def test_expressions_in_lookups_join_choice(self):
midpoint = datetime.time(13, 0)
t1 = Time.objects.create(time=datetime.time(12, 0))
t2 = Time.objects.create(time=datetime.time(14, 0))
SimulationRun.objects.create(start=t1, end=t2, midpoint=midpoint)
SimulationRun.objects.create(start=t1, end=None, midpoint=midpoint)
SimulationRun.objects.create(start=None, end=t2, midpoint=midpoint)
SimulationRun.objects.create(start=None, end=None, midpoint=midpoint)
queryset = SimulationRun.objects.filter(midpoint__range=[F('start__time'), F('end__time')])
self.assertQuerysetEqual(
queryset,
['<SimulationRun: 13:00:00 (12:00:00 to 14:00:00)>'],
ordered=False
)
for alias in queryset.query.alias_map.values():
if isinstance(alias, Join):
self.assertEqual(alias.join_type, constants.INNER)
queryset = SimulationRun.objects.exclude(midpoint__range=[F('start__time'), F('end__time')])
self.assertQuerysetEqual(queryset, [], ordered=False)
for alias in queryset.query.alias_map.values():
if isinstance(alias, Join):
self.assertEqual(alias.join_type, constants.LOUTER)
def test_range_lookup_allows_F_expressions_and_expressions_for_integers(self):
# Range lookups can use F() expressions for integers.
Company.objects.filter(num_employees__exact=F("num_chairs"))
self.assertQuerysetEqual(
Company.objects.filter(num_employees__range=(F('num_chairs'), 100)),
['<Company: 5020 Ltd>', '<Company: 5040 Ltd>', '<Company: 5050 Ltd>'],
ordered=False
)
self.assertQuerysetEqual(
Company.objects.filter(num_employees__range=(F('num_chairs') - 10, F('num_chairs') + 10)),
['<Company: 5040 Ltd>', '<Company: 5050 Ltd>', '<Company: 5060 Ltd>'],
ordered=False
)
self.assertQuerysetEqual(
Company.objects.filter(num_employees__range=(F('num_chairs') - 10, 100)),
['<Company: 5020 Ltd>', '<Company: 5040 Ltd>', '<Company: 5050 Ltd>', '<Company: 5060 Ltd>'],
ordered=False
)
self.assertQuerysetEqual(
Company.objects.filter(num_employees__range=(1, 100)),
[
'<Company: 5020 Ltd>', '<Company: 5040 Ltd>', '<Company: 5050 Ltd>',
'<Company: 5060 Ltd>', '<Company: 99300 Ltd>',
],
ordered=False
)
@unittest.skipUnless(connection.vendor == 'sqlite',
"This defensive test only works on databases that don't validate parameter types")
def test_complex_expressions_do_not_introduce_sql_injection_via_untrusted_string_inclusion(self):
"""
This tests that SQL injection isn't possible using compilation of
expressions in iterable filters, as their compilation happens before
the main query compilation. It's limited to SQLite, as PostgreSQL,
Oracle and other vendors have defense in depth against this by type
checking. Testing against SQLite (the most permissive of the built-in
databases) demonstrates that the problem doesn't exist while keeping
the test simple.
"""
queryset = Company.objects.filter(name__in=[F('num_chairs') + '1)) OR ((1==1'])
self.assertQuerysetEqual(queryset, [], ordered=False)
def test_in_lookup_allows_F_expressions_and_expressions_for_datetimes(self):
start = datetime.datetime(2016, 2, 3, 15, 0, 0)
end = datetime.datetime(2016, 2, 5, 15, 0, 0)
experiment_1 = Experiment.objects.create(
name='Integrity testing',
assigned=start.date(),
start=start,
end=end,
completed=end.date(),
estimated_time=end - start,
)
experiment_2 = Experiment.objects.create(
name='Taste testing',
assigned=start.date(),
start=start,
end=end,
completed=end.date(),
estimated_time=end - start,
)
Result.objects.create(
experiment=experiment_1,
result_time=datetime.datetime(2016, 2, 4, 15, 0, 0),
)
Result.objects.create(
experiment=experiment_1,
result_time=datetime.datetime(2016, 3, 10, 2, 0, 0),
)
Result.objects.create(
experiment=experiment_2,
result_time=datetime.datetime(2016, 1, 8, 5, 0, 0),
)
within_experiment_time = [F('experiment__start'), F('experiment__end')]
queryset = Result.objects.filter(result_time__range=within_experiment_time)
self.assertQuerysetEqual(queryset, ["<Result: Result at 2016-02-04 15:00:00>"])
within_experiment_time = [F('experiment__start'), F('experiment__end')]
queryset = Result.objects.filter(result_time__range=within_experiment_time)
self.assertQuerysetEqual(queryset, ["<Result: Result at 2016-02-04 15:00:00>"])
class FTests(SimpleTestCase):
def test_deepcopy(self):
f = F("foo")
g = deepcopy(f)
self.assertEqual(f.name, g.name)
def test_deconstruct(self):
f = F('name')
path, args, kwargs = f.deconstruct()
self.assertEqual(path, 'django.db.models.expressions.F')
self.assertEqual(args, (f.name,))
self.assertEqual(kwargs, {})
def test_equal(self):
f = F('name')
same_f = F('name')
other_f = F('username')
self.assertEqual(f, same_f)
self.assertNotEqual(f, other_f)
def test_hash(self):
d = {F('name'): 'Bob'}
self.assertIn(F('name'), d)
self.assertEqual(d[F('name')], 'Bob')
def test_not_equal_Value(self):
f = F('name')
value = Value('name')
self.assertNotEqual(f, value)
self.assertNotEqual(value, f)
class ExpressionsTests(TestCase):
def test_F_reuse(self):
f = F('id')
n = Number.objects.create(integer=-1)
c = Company.objects.create(
name="Example Inc.", num_employees=2300, num_chairs=5,
ceo=Employee.objects.create(firstname="Joe", lastname="Smith")
)
c_qs = Company.objects.filter(id=f)
self.assertEqual(c_qs.get(), c)
# Reuse the same F-object for another queryset
n_qs = Number.objects.filter(id=f)
self.assertEqual(n_qs.get(), n)
# The original query still works correctly
self.assertEqual(c_qs.get(), c)
def test_patterns_escape(self):
r"""
Special characters (e.g. %, _ and \) stored in database are
properly escaped when using a pattern lookup with an expression
refs #16731
"""
Employee.objects.bulk_create([
Employee(firstname="%Joh\\nny", lastname="%Joh\\n"),
Employee(firstname="Johnny", lastname="%John"),
Employee(firstname="Jean-Claude", lastname="Claud_"),
Employee(firstname="Jean-Claude", lastname="Claude"),
Employee(firstname="Jean-Claude", lastname="Claude%"),
Employee(firstname="Johnny", lastname="Joh\\n"),
Employee(firstname="Johnny", lastname="John"),
Employee(firstname="Johnny", lastname="_ohn"),
])
self.assertQuerysetEqual(
Employee.objects.filter(firstname__contains=F('lastname')),
["<Employee: %Joh\\nny %Joh\\n>", "<Employee: Jean-Claude Claude>", "<Employee: Johnny John>"],
ordered=False,
)
self.assertQuerysetEqual(
Employee.objects.filter(firstname__startswith=F('lastname')),
["<Employee: %Joh\\nny %Joh\\n>", "<Employee: Johnny John>"],
ordered=False,
)
self.assertQuerysetEqual(
Employee.objects.filter(firstname__endswith=F('lastname')),
["<Employee: Jean-Claude Claude>"],
ordered=False,
)
def test_insensitive_patterns_escape(self):
r"""
Special characters (e.g. %, _ and \) stored in database are
properly escaped when using a case insensitive pattern lookup with an
expression -- refs #16731
"""
Employee.objects.bulk_create([
Employee(firstname="%Joh\\nny", lastname="%joh\\n"),
Employee(firstname="Johnny", lastname="%john"),
Employee(firstname="Jean-Claude", lastname="claud_"),
Employee(firstname="Jean-Claude", lastname="claude"),
Employee(firstname="Jean-Claude", lastname="claude%"),
Employee(firstname="Johnny", lastname="joh\\n"),
Employee(firstname="Johnny", lastname="john"),
Employee(firstname="Johnny", lastname="_ohn"),
])
self.assertQuerysetEqual(
Employee.objects.filter(firstname__icontains=F('lastname')),
["<Employee: %Joh\\nny %joh\\n>", "<Employee: Jean-Claude claude>", "<Employee: Johnny john>"],
ordered=False,
)
self.assertQuerysetEqual(
Employee.objects.filter(firstname__istartswith=F('lastname')),
["<Employee: %Joh\\nny %joh\\n>", "<Employee: Johnny john>"],
ordered=False,
)
self.assertQuerysetEqual(
Employee.objects.filter(firstname__iendswith=F('lastname')),
["<Employee: Jean-Claude claude>"],
ordered=False,
)
@isolate_apps('expressions')
class SimpleExpressionTests(SimpleTestCase):
def test_equal(self):
self.assertEqual(Expression(), Expression())
self.assertEqual(
Expression(IntegerField()),
Expression(output_field=IntegerField())
)
self.assertEqual(Expression(IntegerField()), mock.ANY)
self.assertNotEqual(
Expression(IntegerField()),
Expression(CharField())
)
class TestModel(Model):
field = IntegerField()
other_field = IntegerField()
self.assertNotEqual(
Expression(TestModel._meta.get_field('field')),
Expression(TestModel._meta.get_field('other_field')),
)
def test_hash(self):
self.assertEqual(hash(Expression()), hash(Expression()))
self.assertEqual(
hash(Expression(IntegerField())),
hash(Expression(output_field=IntegerField()))
)
self.assertNotEqual(
hash(Expression(IntegerField())),
hash(Expression(CharField())),
)
class TestModel(Model):
field = IntegerField()
other_field = IntegerField()
self.assertNotEqual(
hash(Expression(TestModel._meta.get_field('field'))),
hash(Expression(TestModel._meta.get_field('other_field'))),
)
class ExpressionsNumericTests(TestCase):
@classmethod
def setUpTestData(cls):
Number(integer=-1).save()
Number(integer=42).save()
Number(integer=1337).save()
Number.objects.update(float=F('integer'))
def test_fill_with_value_from_same_object(self):
"""
We can fill a value in all objects with an other value of the
same object.
"""
self.assertQuerysetEqual(
Number.objects.all(),
['<Number: -1, -1.000>', '<Number: 42, 42.000>', '<Number: 1337, 1337.000>'],
ordered=False
)
def test_increment_value(self):
"""
We can increment a value of all objects in a query set.
"""
self.assertEqual(Number.objects.filter(integer__gt=0).update(integer=F('integer') + 1), 2)
self.assertQuerysetEqual(
Number.objects.all(),
['<Number: -1, -1.000>', '<Number: 43, 42.000>', '<Number: 1338, 1337.000>'],
ordered=False
)
def test_filter_not_equals_other_field(self):
"""
We can filter for objects, where a value is not equals the value
of an other field.
"""
self.assertEqual(Number.objects.filter(integer__gt=0).update(integer=F('integer') + 1), 2)
self.assertQuerysetEqual(
Number.objects.exclude(float=F('integer')),
['<Number: 43, 42.000>', '<Number: 1338, 1337.000>'],
ordered=False
)
def test_complex_expressions(self):
"""
Complex expressions of different connection types are possible.
"""
n = Number.objects.create(integer=10, float=123.45)
self.assertEqual(Number.objects.filter(pk=n.pk).update(
float=F('integer') + F('float') * 2), 1)
self.assertEqual(Number.objects.get(pk=n.pk).integer, 10)
self.assertEqual(Number.objects.get(pk=n.pk).float, Approximate(256.900, places=3))
class ExpressionOperatorTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.n = Number.objects.create(integer=42, float=15.5)
cls.n1 = Number.objects.create(integer=-42, float=-15.5)
def test_lefthand_addition(self):
# LH Addition of floats and integers
Number.objects.filter(pk=self.n.pk).update(
integer=F('integer') + 15,
float=F('float') + 42.7
)
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 57)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(58.200, places=3))
def test_lefthand_subtraction(self):
# LH Subtraction of floats and integers
Number.objects.filter(pk=self.n.pk).update(integer=F('integer') - 15, float=F('float') - 42.7)
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 27)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(-27.200, places=3))
def test_lefthand_multiplication(self):
# Multiplication of floats and integers
Number.objects.filter(pk=self.n.pk).update(integer=F('integer') * 15, float=F('float') * 42.7)
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 630)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(661.850, places=3))
def test_lefthand_division(self):
# LH Division of floats and integers
Number.objects.filter(pk=self.n.pk).update(integer=F('integer') / 2, float=F('float') / 42.7)
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 21)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(0.363, places=3))
def test_lefthand_modulo(self):
# LH Modulo arithmetic on integers
Number.objects.filter(pk=self.n.pk).update(integer=F('integer') % 20)
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 2)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
def test_lefthand_bitwise_and(self):
# LH Bitwise ands on integers
Number.objects.filter(pk=self.n.pk).update(integer=F('integer').bitand(56))
Number.objects.filter(pk=self.n1.pk).update(integer=F('integer').bitand(-56))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 40)
self.assertEqual(Number.objects.get(pk=self.n1.pk).integer, -64)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
def test_lefthand_bitwise_left_shift_operator(self):
Number.objects.update(integer=F('integer').bitleftshift(2))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 168)
self.assertEqual(Number.objects.get(pk=self.n1.pk).integer, -168)
def test_lefthand_bitwise_right_shift_operator(self):
Number.objects.update(integer=F('integer').bitrightshift(2))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 10)
self.assertEqual(Number.objects.get(pk=self.n1.pk).integer, -11)
def test_lefthand_bitwise_or(self):
# LH Bitwise or on integers
Number.objects.update(integer=F('integer').bitor(48))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 58)
self.assertEqual(Number.objects.get(pk=self.n1.pk).integer, -10)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
def test_lefthand_power(self):
# LH Power arithmetic operation on floats and integers
Number.objects.filter(pk=self.n.pk).update(integer=F('integer') ** 2, float=F('float') ** 1.5)
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 1764)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(61.02, places=2))
def test_right_hand_addition(self):
# Right hand operators
Number.objects.filter(pk=self.n.pk).update(integer=15 + F('integer'), float=42.7 + F('float'))
# RH Addition of floats and integers
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 57)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(58.200, places=3))
def test_right_hand_subtraction(self):
Number.objects.filter(pk=self.n.pk).update(integer=15 - F('integer'), float=42.7 - F('float'))
# RH Subtraction of floats and integers
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, -27)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(27.200, places=3))
def test_right_hand_multiplication(self):
# RH Multiplication of floats and integers
Number.objects.filter(pk=self.n.pk).update(integer=15 * F('integer'), float=42.7 * F('float'))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 630)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(661.850, places=3))
def test_right_hand_division(self):
# RH Division of floats and integers
Number.objects.filter(pk=self.n.pk).update(integer=640 / F('integer'), float=42.7 / F('float'))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 15)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(2.755, places=3))
def test_right_hand_modulo(self):
# RH Modulo arithmetic on integers
Number.objects.filter(pk=self.n.pk).update(integer=69 % F('integer'))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 27)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
def test_righthand_power(self):
# RH Power arithmetic operation on floats and integers
Number.objects.filter(pk=self.n.pk).update(integer=2 ** F('integer'), float=1.5 ** F('float'))
self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 4398046511104)
self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(536.308, places=3))
class FTimeDeltaTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.sday = sday = datetime.date(2010, 6, 25)
cls.stime = stime = datetime.datetime(2010, 6, 25, 12, 15, 30, 747000)
midnight = datetime.time(0)
delta0 = datetime.timedelta(0)
delta1 = datetime.timedelta(microseconds=253000)
delta2 = datetime.timedelta(seconds=44)
delta3 = datetime.timedelta(hours=21, minutes=8)
delta4 = datetime.timedelta(days=10)
delta5 = datetime.timedelta(days=90)
# Test data is set so that deltas and delays will be
# strictly increasing.
cls.deltas = []
cls.delays = []
cls.days_long = []
# e0: started same day as assigned, zero duration
end = stime + delta0
e0 = Experiment.objects.create(
name='e0', assigned=sday, start=stime, end=end,
completed=end.date(), estimated_time=delta0,
)
cls.deltas.append(delta0)
cls.delays.append(e0.start - datetime.datetime.combine(e0.assigned, midnight))
cls.days_long.append(e0.completed - e0.assigned)
# e1: started one day after assigned, tiny duration, data
# set so that end time has no fractional seconds, which
# tests an edge case on sqlite.
delay = datetime.timedelta(1)
end = stime + delay + delta1
e1 = Experiment.objects.create(
name='e1', assigned=sday, start=stime + delay, end=end,
completed=end.date(), estimated_time=delta1,
)
cls.deltas.append(delta1)
cls.delays.append(e1.start - datetime.datetime.combine(e1.assigned, midnight))
cls.days_long.append(e1.completed - e1.assigned)
# e2: started three days after assigned, small duration
end = stime + delta2
e2 = Experiment.objects.create(
name='e2', assigned=sday - datetime.timedelta(3), start=stime,
end=end, completed=end.date(), estimated_time=datetime.timedelta(hours=1),
)
cls.deltas.append(delta2)
cls.delays.append(e2.start - datetime.datetime.combine(e2.assigned, midnight))
cls.days_long.append(e2.completed - e2.assigned)
# e3: started four days after assigned, medium duration
delay = datetime.timedelta(4)
end = stime + delay + delta3
e3 = Experiment.objects.create(
name='e3', assigned=sday, start=stime + delay, end=end,
completed=end.date(), estimated_time=delta3,
)
cls.deltas.append(delta3)
cls.delays.append(e3.start - datetime.datetime.combine(e3.assigned, midnight))
cls.days_long.append(e3.completed - e3.assigned)
# e4: started 10 days after assignment, long duration
end = stime + delta4
e4 = Experiment.objects.create(
name='e4', assigned=sday - datetime.timedelta(10), start=stime,
end=end, completed=end.date(), estimated_time=delta4 - datetime.timedelta(1),
)
cls.deltas.append(delta4)
cls.delays.append(e4.start - datetime.datetime.combine(e4.assigned, midnight))
cls.days_long.append(e4.completed - e4.assigned)
# e5: started a month after assignment, very long duration
delay = datetime.timedelta(30)
end = stime + delay + delta5
e5 = Experiment.objects.create(
name='e5', assigned=sday, start=stime + delay, end=end,
completed=end.date(), estimated_time=delta5,
)
cls.deltas.append(delta5)
cls.delays.append(e5.start - datetime.datetime.combine(e5.assigned, midnight))
cls.days_long.append(e5.completed - e5.assigned)
cls.expnames = [e.name for e in Experiment.objects.all()]
def test_multiple_query_compilation(self):
# Ticket #21643
queryset = Experiment.objects.filter(end__lt=F('start') + datetime.timedelta(hours=1))
q1 = str(queryset.query)
q2 = str(queryset.query)
self.assertEqual(q1, q2)
def test_query_clone(self):
# Ticket #21643 - Crash when compiling query more than once
qs = Experiment.objects.filter(end__lt=F('start') + datetime.timedelta(hours=1))
qs2 = qs.all()
list(qs)
list(qs2)
# Intentionally no assert
def test_delta_add(self):
for i, delta in enumerate(self.deltas):
test_set = [e.name for e in Experiment.objects.filter(end__lt=F('start') + delta)]
self.assertEqual(test_set, self.expnames[:i])
test_set = [e.name for e in Experiment.objects.filter(end__lt=delta + F('start'))]
self.assertEqual(test_set, self.expnames[:i])
test_set = [e.name for e in Experiment.objects.filter(end__lte=F('start') + delta)]
self.assertEqual(test_set, self.expnames[:i + 1])
def test_delta_subtract(self):
for i, delta in enumerate(self.deltas):
test_set = [e.name for e in Experiment.objects.filter(start__gt=F('end') - delta)]
self.assertEqual(test_set, self.expnames[:i])
test_set = [e.name for e in Experiment.objects.filter(start__gte=F('end') - delta)]
self.assertEqual(test_set, self.expnames[:i + 1])
def test_exclude(self):
for i, delta in enumerate(self.deltas):
test_set = [e.name for e in Experiment.objects.exclude(end__lt=F('start') + delta)]
self.assertEqual(test_set, self.expnames[i:])
test_set = [e.name for e in Experiment.objects.exclude(end__lte=F('start') + delta)]
self.assertEqual(test_set, self.expnames[i + 1:])
def test_date_comparison(self):
for i, days in enumerate(self.days_long):
test_set = [e.name for e in Experiment.objects.filter(completed__lt=F('assigned') + days)]
self.assertEqual(test_set, self.expnames[:i])
test_set = [e.name for e in Experiment.objects.filter(completed__lte=F('assigned') + days)]
self.assertEqual(test_set, self.expnames[:i + 1])
@skipUnlessDBFeature("supports_mixed_date_datetime_comparisons")
def test_mixed_comparisons1(self):
for i, delay in enumerate(self.delays):
test_set = [e.name for e in Experiment.objects.filter(assigned__gt=F('start') - delay)]
self.assertEqual(test_set, self.expnames[:i])
test_set = [e.name for e in Experiment.objects.filter(assigned__gte=F('start') - delay)]
self.assertEqual(test_set, self.expnames[:i + 1])
def test_mixed_comparisons2(self):
for i, delay in enumerate(self.delays):
delay = datetime.timedelta(delay.days)
test_set = [e.name for e in Experiment.objects.filter(start__lt=F('assigned') + delay)]
self.assertEqual(test_set, self.expnames[:i])
test_set = [
e.name for e in Experiment.objects.filter(start__lte=F('assigned') + delay + datetime.timedelta(1))
]
self.assertEqual(test_set, self.expnames[:i + 1])
def test_delta_update(self):
for delta in self.deltas:
exps = Experiment.objects.all()
expected_durations = [e.duration() for e in exps]
expected_starts = [e.start + delta for e in exps]
expected_ends = [e.end + delta for e in exps]
Experiment.objects.update(start=F('start') + delta, end=F('end') + delta)
exps = Experiment.objects.all()
new_starts = [e.start for e in exps]
new_ends = [e.end for e in exps]
new_durations = [e.duration() for e in exps]
self.assertEqual(expected_starts, new_starts)
self.assertEqual(expected_ends, new_ends)
self.assertEqual(expected_durations, new_durations)
def test_invalid_operator(self):
with self.assertRaises(DatabaseError):
list(Experiment.objects.filter(start=F('start') * datetime.timedelta(0)))
def test_durationfield_add(self):
zeros = [e.name for e in Experiment.objects.filter(start=F('start') + F('estimated_time'))]
self.assertEqual(zeros, ['e0'])
end_less = [e.name for e in Experiment.objects.filter(end__lt=F('start') + F('estimated_time'))]
self.assertEqual(end_less, ['e2'])
delta_math = [
e.name for e in
Experiment.objects.filter(end__gte=F('start') + F('estimated_time') + datetime.timedelta(hours=1))
]
self.assertEqual(delta_math, ['e4'])
queryset = Experiment.objects.annotate(shifted=ExpressionWrapper(
F('start') + Value(None, output_field=DurationField()),
output_field=DateTimeField(),
))
self.assertIsNone(queryset.first().shifted)
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_date_subtraction(self):
queryset = Experiment.objects.annotate(
completion_duration=ExpressionWrapper(
F('completed') - F('assigned'), output_field=DurationField()
)
)
at_least_5_days = {e.name for e in queryset.filter(completion_duration__gte=datetime.timedelta(days=5))}
self.assertEqual(at_least_5_days, {'e3', 'e4', 'e5'})
at_least_120_days = {e.name for e in queryset.filter(completion_duration__gte=datetime.timedelta(days=120))}
self.assertEqual(at_least_120_days, {'e5'})
less_than_5_days = {e.name for e in queryset.filter(completion_duration__lt=datetime.timedelta(days=5))}
self.assertEqual(less_than_5_days, {'e0', 'e1', 'e2'})
queryset = Experiment.objects.annotate(difference=ExpressionWrapper(
F('completed') - Value(None, output_field=DateField()),
output_field=DurationField(),
))
self.assertIsNone(queryset.first().difference)
queryset = Experiment.objects.annotate(shifted=ExpressionWrapper(
F('completed') - Value(None, output_field=DurationField()),
output_field=DateField(),
))
self.assertIsNone(queryset.first().shifted)
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_date_subquery_subtraction(self):
subquery = Experiment.objects.filter(pk=OuterRef('pk')).values('completed')
queryset = Experiment.objects.annotate(
difference=ExpressionWrapper(
subquery - F('completed'), output_field=DurationField(),
),
).filter(difference=datetime.timedelta())
self.assertTrue(queryset.exists())
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_time_subtraction(self):
Time.objects.create(time=datetime.time(12, 30, 15, 2345))
queryset = Time.objects.annotate(
difference=ExpressionWrapper(
F('time') - Value(datetime.time(11, 15, 0), output_field=TimeField()),
output_field=DurationField(),
)
)
self.assertEqual(
queryset.get().difference,
datetime.timedelta(hours=1, minutes=15, seconds=15, microseconds=2345)
)
queryset = Time.objects.annotate(difference=ExpressionWrapper(
F('time') - Value(None, output_field=TimeField()),
output_field=DurationField(),
))
self.assertIsNone(queryset.first().difference)
queryset = Time.objects.annotate(shifted=ExpressionWrapper(
F('time') - Value(None, output_field=DurationField()),
output_field=TimeField(),
))
self.assertIsNone(queryset.first().shifted)
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_time_subquery_subtraction(self):
Time.objects.create(time=datetime.time(12, 30, 15, 2345))
subquery = Time.objects.filter(pk=OuterRef('pk')).values('time')
queryset = Time.objects.annotate(
difference=ExpressionWrapper(
subquery - F('time'), output_field=DurationField(),
),
).filter(difference=datetime.timedelta())
self.assertTrue(queryset.exists())
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_datetime_subtraction(self):
under_estimate = [
e.name for e in Experiment.objects.filter(estimated_time__gt=F('end') - F('start'))
]
self.assertEqual(under_estimate, ['e2'])
over_estimate = [
e.name for e in Experiment.objects.filter(estimated_time__lt=F('end') - F('start'))
]
self.assertEqual(over_estimate, ['e4'])
queryset = Experiment.objects.annotate(difference=ExpressionWrapper(
F('start') - Value(None, output_field=DateTimeField()),
output_field=DurationField(),
))
self.assertIsNone(queryset.first().difference)
queryset = Experiment.objects.annotate(shifted=ExpressionWrapper(
F('start') - Value(None, output_field=DurationField()),
output_field=DateTimeField(),
))
self.assertIsNone(queryset.first().shifted)
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_datetime_subquery_subtraction(self):
subquery = Experiment.objects.filter(pk=OuterRef('pk')).values('start')
queryset = Experiment.objects.annotate(
difference=ExpressionWrapper(
subquery - F('start'), output_field=DurationField(),
),
).filter(difference=datetime.timedelta())
self.assertTrue(queryset.exists())
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_datetime_subtraction_microseconds(self):
delta = datetime.timedelta(microseconds=8999999999999999)
Experiment.objects.update(end=F('start') + delta)
qs = Experiment.objects.annotate(
delta=ExpressionWrapper(F('end') - F('start'), output_field=DurationField())
)
for e in qs:
self.assertEqual(e.delta, delta)
def test_duration_with_datetime(self):
# Exclude e1 which has very high precision so we can test this on all
# backends regardless of whether or not it supports
# microsecond_precision.
over_estimate = Experiment.objects.exclude(name='e1').filter(
completed__gt=self.stime + F('estimated_time'),
).order_by('name')
self.assertQuerysetEqual(over_estimate, ['e3', 'e4', 'e5'], lambda e: e.name)
def test_duration_with_datetime_microseconds(self):
delta = datetime.timedelta(microseconds=8999999999999999)
qs = Experiment.objects.annotate(dt=ExpressionWrapper(
F('start') + delta,
output_field=DateTimeField(),
))
for e in qs:
self.assertEqual(e.dt, e.start + delta)
def test_date_minus_duration(self):
more_than_4_days = Experiment.objects.filter(
assigned__lt=F('completed') - Value(datetime.timedelta(days=4), output_field=DurationField())
)
self.assertQuerysetEqual(more_than_4_days, ['e3', 'e4', 'e5'], lambda e: e.name)
def test_negative_timedelta_update(self):
# subtract 30 seconds, 30 minutes, 2 hours and 2 days
experiments = Experiment.objects.filter(name='e0').annotate(
start_sub_seconds=F('start') + datetime.timedelta(seconds=-30),
).annotate(
start_sub_minutes=F('start_sub_seconds') + datetime.timedelta(minutes=-30),
).annotate(
start_sub_hours=F('start_sub_minutes') + datetime.timedelta(hours=-2),
).annotate(
new_start=F('start_sub_hours') + datetime.timedelta(days=-2),
)
expected_start = datetime.datetime(2010, 6, 23, 9, 45, 0)
# subtract 30 microseconds
experiments = experiments.annotate(new_start=F('new_start') + datetime.timedelta(microseconds=-30))
expected_start += datetime.timedelta(microseconds=+746970)
experiments.update(start=F('new_start'))
e0 = Experiment.objects.get(name='e0')
self.assertEqual(e0.start, expected_start)
class ValueTests(TestCase):
def test_update_TimeField_using_Value(self):
Time.objects.create()
Time.objects.update(time=Value(datetime.time(1), output_field=TimeField()))
self.assertEqual(Time.objects.get().time, datetime.time(1))
def test_update_UUIDField_using_Value(self):
UUID.objects.create()
UUID.objects.update(uuid=Value(uuid.UUID('12345678901234567890123456789012'), output_field=UUIDField()))
self.assertEqual(UUID.objects.get().uuid, uuid.UUID('12345678901234567890123456789012'))
def test_deconstruct(self):
value = Value('name')
path, args, kwargs = value.deconstruct()
self.assertEqual(path, 'django.db.models.expressions.Value')
self.assertEqual(args, (value.value,))
self.assertEqual(kwargs, {})
def test_deconstruct_output_field(self):
value = Value('name', output_field=CharField())
path, args, kwargs = value.deconstruct()
self.assertEqual(path, 'django.db.models.expressions.Value')
self.assertEqual(args, (value.value,))
self.assertEqual(len(kwargs), 1)
self.assertEqual(kwargs['output_field'].deconstruct(), CharField().deconstruct())
def test_equal(self):
value = Value('name')
self.assertEqual(value, Value('name'))
self.assertNotEqual(value, Value('username'))
def test_hash(self):
d = {Value('name'): 'Bob'}
self.assertIn(Value('name'), d)
self.assertEqual(d[Value('name')], 'Bob')
def test_equal_output_field(self):
value = Value('name', output_field=CharField())
same_value = Value('name', output_field=CharField())
other_value = Value('name', output_field=TimeField())
no_output_field = Value('name')
self.assertEqual(value, same_value)
self.assertNotEqual(value, other_value)
self.assertNotEqual(value, no_output_field)
def test_raise_empty_expressionlist(self):
msg = 'ExpressionList requires at least one expression'
with self.assertRaisesMessage(ValueError, msg):
ExpressionList()
class FieldTransformTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.sday = sday = datetime.date(2010, 6, 25)
cls.stime = stime = datetime.datetime(2010, 6, 25, 12, 15, 30, 747000)
cls.ex1 = Experiment.objects.create(
name='Experiment 1',
assigned=sday,
completed=sday + datetime.timedelta(2),
estimated_time=datetime.timedelta(2),
start=stime,
end=stime + datetime.timedelta(2),
)
def test_month_aggregation(self):
self.assertEqual(
Experiment.objects.aggregate(month_count=Count('assigned__month')),
{'month_count': 1}
)
def test_transform_in_values(self):
self.assertQuerysetEqual(
Experiment.objects.values('assigned__month'),
["{'assigned__month': 6}"]
)
def test_multiple_transforms_in_values(self):
self.assertQuerysetEqual(
Experiment.objects.values('end__date__month'),
["{'end__date__month': 6}"]
)
class ReprTests(SimpleTestCase):
def test_expressions(self):
self.assertEqual(
repr(Case(When(a=1))),
"<Case: CASE WHEN <Q: (AND: ('a', 1))> THEN Value(None), ELSE Value(None)>"
)
self.assertEqual(
repr(When(Q(age__gte=18), then=Value('legal'))),
"<When: WHEN <Q: (AND: ('age__gte', 18))> THEN Value(legal)>"
)
self.assertEqual(repr(Col('alias', 'field')), "Col(alias, field)")
self.assertEqual(repr(F('published')), "F(published)")
self.assertEqual(repr(F('cost') + F('tax')), "<CombinedExpression: F(cost) + F(tax)>")
self.assertEqual(
repr(ExpressionWrapper(F('cost') + F('tax'), IntegerField())),
"ExpressionWrapper(F(cost) + F(tax))"
)
self.assertEqual(repr(Func('published', function='TO_CHAR')), "Func(F(published), function=TO_CHAR)")
self.assertEqual(repr(OrderBy(Value(1))), 'OrderBy(Value(1), descending=False)')
self.assertEqual(repr(Random()), "Random()")
self.assertEqual(repr(RawSQL('table.col', [])), "RawSQL(table.col, [])")
self.assertEqual(repr(Ref('sum_cost', Sum('cost'))), "Ref(sum_cost, Sum(F(cost)))")
self.assertEqual(repr(Value(1)), "Value(1)")
self.assertEqual(
repr(ExpressionList(F('col'), F('anothercol'))),
'ExpressionList(F(col), F(anothercol))'
)
self.assertEqual(
repr(ExpressionList(OrderBy(F('col'), descending=False))),
'ExpressionList(OrderBy(F(col), descending=False))'
)
def test_functions(self):
self.assertEqual(repr(Coalesce('a', 'b')), "Coalesce(F(a), F(b))")
self.assertEqual(repr(Concat('a', 'b')), "Concat(ConcatPair(F(a), F(b)))")
self.assertEqual(repr(Length('a')), "Length(F(a))")
self.assertEqual(repr(Lower('a')), "Lower(F(a))")
self.assertEqual(repr(Substr('a', 1, 3)), "Substr(F(a), Value(1), Value(3))")
self.assertEqual(repr(Upper('a')), "Upper(F(a))")
def test_aggregates(self):
self.assertEqual(repr(Avg('a')), "Avg(F(a))")
self.assertEqual(repr(Count('a')), "Count(F(a))")
self.assertEqual(repr(Count('*')), "Count('*')")
self.assertEqual(repr(Max('a')), "Max(F(a))")
self.assertEqual(repr(Min('a')), "Min(F(a))")
self.assertEqual(repr(StdDev('a')), "StdDev(F(a), sample=False)")
self.assertEqual(repr(Sum('a')), "Sum(F(a))")
self.assertEqual(repr(Variance('a', sample=True)), "Variance(F(a), sample=True)")
def test_distinct_aggregates(self):
self.assertEqual(repr(Count('a', distinct=True)), "Count(F(a), distinct=True)")
self.assertEqual(repr(Count('*', distinct=True)), "Count('*', distinct=True)")
def test_filtered_aggregates(self):
filter = Q(a=1)
self.assertEqual(repr(Avg('a', filter=filter)), "Avg(F(a), filter=(AND: ('a', 1)))")
self.assertEqual(repr(Count('a', filter=filter)), "Count(F(a), filter=(AND: ('a', 1)))")
self.assertEqual(repr(Max('a', filter=filter)), "Max(F(a), filter=(AND: ('a', 1)))")
self.assertEqual(repr(Min('a', filter=filter)), "Min(F(a), filter=(AND: ('a', 1)))")
self.assertEqual(repr(StdDev('a', filter=filter)), "StdDev(F(a), filter=(AND: ('a', 1)), sample=False)")
self.assertEqual(repr(Sum('a', filter=filter)), "Sum(F(a), filter=(AND: ('a', 1)))")
self.assertEqual(
repr(Variance('a', sample=True, filter=filter)),
"Variance(F(a), filter=(AND: ('a', 1)), sample=True)"
)
self.assertEqual(
repr(Count('a', filter=filter, distinct=True)), "Count(F(a), distinct=True, filter=(AND: ('a', 1)))"
)
class CombinableTests(SimpleTestCase):
bitwise_msg = 'Use .bitand() and .bitor() for bitwise logical operations.'
def test_negation(self):
c = Combinable()
self.assertEqual(-c, c * -1)
def test_and(self):
with self.assertRaisesMessage(NotImplementedError, self.bitwise_msg):
Combinable() & Combinable()
def test_or(self):
with self.assertRaisesMessage(NotImplementedError, self.bitwise_msg):
Combinable() | Combinable()
def test_reversed_and(self):
with self.assertRaisesMessage(NotImplementedError, self.bitwise_msg):
object() & Combinable()
def test_reversed_or(self):
with self.assertRaisesMessage(NotImplementedError, self.bitwise_msg):
object() | Combinable()
|
7df1fdf7f7baff1ce6f829d538f25b603f513dcc676a8378cfc6de0374c34018 | import datetime
from operator import attrgetter
from django.core.exceptions import FieldError
from django.db import models
from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
from django.test.utils import isolate_apps
from django.utils import translation
from .models import (
Article, ArticleIdea, ArticleTag, ArticleTranslation, Country, Friendship,
Group, Membership, NewsArticle, Person,
)
# Note that these tests are testing internal implementation details.
# ForeignObject is not part of public API.
class MultiColumnFKTests(TestCase):
@classmethod
def setUpTestData(cls):
# Creating countries
cls.usa = Country.objects.create(name="United States of America")
cls.soviet_union = Country.objects.create(name="Soviet Union")
# Creating People
cls.bob = Person.objects.create(name='Bob', person_country=cls.usa)
cls.jim = Person.objects.create(name='Jim', person_country=cls.usa)
cls.george = Person.objects.create(name='George', person_country=cls.usa)
cls.jane = Person.objects.create(name='Jane', person_country=cls.soviet_union)
cls.mark = Person.objects.create(name='Mark', person_country=cls.soviet_union)
cls.sam = Person.objects.create(name='Sam', person_country=cls.soviet_union)
# Creating Groups
cls.kgb = Group.objects.create(name='KGB', group_country=cls.soviet_union)
cls.cia = Group.objects.create(name='CIA', group_country=cls.usa)
cls.republican = Group.objects.create(name='Republican', group_country=cls.usa)
cls.democrat = Group.objects.create(name='Democrat', group_country=cls.usa)
def test_get_succeeds_on_multicolumn_match(self):
# Membership objects have access to their related Person if both
# country_ids match between them
membership = Membership.objects.create(
membership_country_id=self.usa.id, person_id=self.bob.id, group_id=self.cia.id)
person = membership.person
self.assertEqual((person.id, person.name), (self.bob.id, "Bob"))
def test_get_fails_on_multicolumn_mismatch(self):
# Membership objects returns DoesNotExist error when the there is no
# Person with the same id and country_id
membership = Membership.objects.create(
membership_country_id=self.usa.id, person_id=self.jane.id, group_id=self.cia.id)
with self.assertRaises(Person.DoesNotExist):
getattr(membership, 'person')
def test_reverse_query_returns_correct_result(self):
# Creating a valid membership because it has the same country has the person
Membership.objects.create(
membership_country_id=self.usa.id, person_id=self.bob.id, group_id=self.cia.id)
# Creating an invalid membership because it has a different country has the person
Membership.objects.create(
membership_country_id=self.soviet_union.id, person_id=self.bob.id,
group_id=self.republican.id)
with self.assertNumQueries(1):
membership = self.bob.membership_set.get()
self.assertEqual(membership.group_id, self.cia.id)
self.assertIs(membership.person, self.bob)
def test_query_filters_correctly(self):
# Creating a to valid memberships
Membership.objects.create(
membership_country_id=self.usa.id, person_id=self.bob.id, group_id=self.cia.id)
Membership.objects.create(
membership_country_id=self.usa.id, person_id=self.jim.id,
group_id=self.cia.id)
# Creating an invalid membership
Membership.objects.create(membership_country_id=self.soviet_union.id,
person_id=self.george.id, group_id=self.cia.id)
self.assertQuerysetEqual(
Membership.objects.filter(person__name__contains='o'), [
self.bob.id
],
attrgetter("person_id")
)
def test_reverse_query_filters_correctly(self):
timemark = datetime.datetime.utcnow()
timedelta = datetime.timedelta(days=1)
# Creating a to valid memberships
Membership.objects.create(
membership_country_id=self.usa.id, person_id=self.bob.id,
group_id=self.cia.id, date_joined=timemark - timedelta)
Membership.objects.create(
membership_country_id=self.usa.id, person_id=self.jim.id,
group_id=self.cia.id, date_joined=timemark + timedelta)
# Creating an invalid membership
Membership.objects.create(
membership_country_id=self.soviet_union.id, person_id=self.george.id,
group_id=self.cia.id, date_joined=timemark + timedelta)
self.assertQuerysetEqual(
Person.objects.filter(membership__date_joined__gte=timemark), [
'Jim'
],
attrgetter('name')
)
def test_forward_in_lookup_filters_correctly(self):
Membership.objects.create(membership_country_id=self.usa.id, person_id=self.bob.id,
group_id=self.cia.id)
Membership.objects.create(membership_country_id=self.usa.id, person_id=self.jim.id,
group_id=self.cia.id)
# Creating an invalid membership
Membership.objects.create(
membership_country_id=self.soviet_union.id, person_id=self.george.id,
group_id=self.cia.id)
self.assertQuerysetEqual(
Membership.objects.filter(person__in=[self.george, self.jim]), [
self.jim.id,
],
attrgetter('person_id')
)
self.assertQuerysetEqual(
Membership.objects.filter(person__in=Person.objects.filter(name='Jim')), [
self.jim.id,
],
attrgetter('person_id')
)
def test_double_nested_query(self):
m1 = Membership.objects.create(membership_country_id=self.usa.id, person_id=self.bob.id,
group_id=self.cia.id)
m2 = Membership.objects.create(membership_country_id=self.usa.id, person_id=self.jim.id,
group_id=self.cia.id)
Friendship.objects.create(from_friend_country_id=self.usa.id, from_friend_id=self.bob.id,
to_friend_country_id=self.usa.id, to_friend_id=self.jim.id)
self.assertSequenceEqual(
Membership.objects.filter(
person__in=Person.objects.filter(
from_friend__in=Friendship.objects.filter(to_friend__in=Person.objects.all())
)
),
[m1]
)
self.assertSequenceEqual(
Membership.objects.exclude(
person__in=Person.objects.filter(
from_friend__in=Friendship.objects.filter(to_friend__in=Person.objects.all())
)
),
[m2]
)
def test_select_related_foreignkey_forward_works(self):
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
Membership.objects.create(membership_country=self.usa, person=self.jim, group=self.democrat)
with self.assertNumQueries(1):
people = [m.person for m in Membership.objects.select_related('person').order_by('pk')]
normal_people = [m.person for m in Membership.objects.all().order_by('pk')]
self.assertEqual(people, normal_people)
def test_prefetch_foreignkey_forward_works(self):
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
Membership.objects.create(membership_country=self.usa, person=self.jim, group=self.democrat)
with self.assertNumQueries(2):
people = [
m.person for m in Membership.objects.prefetch_related('person').order_by('pk')]
normal_people = [m.person for m in Membership.objects.order_by('pk')]
self.assertEqual(people, normal_people)
def test_prefetch_foreignkey_reverse_works(self):
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
Membership.objects.create(membership_country=self.usa, person=self.jim, group=self.democrat)
with self.assertNumQueries(2):
membership_sets = [
list(p.membership_set.all())
for p in Person.objects.prefetch_related('membership_set').order_by('pk')]
with self.assertNumQueries(7):
normal_membership_sets = [
list(p.membership_set.all())
for p in Person.objects.order_by('pk')
]
self.assertEqual(membership_sets, normal_membership_sets)
def test_m2m_through_forward_returns_valid_members(self):
# We start out by making sure that the Group 'CIA' has no members.
self.assertQuerysetEqual(
self.cia.members.all(),
[]
)
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
Membership.objects.create(membership_country=self.usa, person=self.jim, group=self.cia)
# Let's check to make sure that it worked. Bob and Jim should be members of the CIA.
self.assertQuerysetEqual(
self.cia.members.all(), [
'Bob',
'Jim'
], attrgetter("name")
)
def test_m2m_through_reverse_returns_valid_members(self):
# We start out by making sure that Bob is in no groups.
self.assertQuerysetEqual(
self.bob.groups.all(),
[]
)
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
Membership.objects.create(membership_country=self.usa, person=self.bob,
group=self.republican)
# Bob should be in the CIA and a Republican
self.assertQuerysetEqual(
self.bob.groups.all(), [
'CIA',
'Republican'
], attrgetter("name")
)
def test_m2m_through_forward_ignores_invalid_members(self):
# We start out by making sure that the Group 'CIA' has no members.
self.assertQuerysetEqual(
self.cia.members.all(),
[]
)
# Something adds jane to group CIA but Jane is in Soviet Union which isn't CIA's country
Membership.objects.create(membership_country=self.usa, person=self.jane, group=self.cia)
# There should still be no members in CIA
self.assertQuerysetEqual(
self.cia.members.all(),
[]
)
def test_m2m_through_reverse_ignores_invalid_members(self):
# We start out by making sure that Jane has no groups.
self.assertQuerysetEqual(
self.jane.groups.all(),
[]
)
# Something adds jane to group CIA but Jane is in Soviet Union which isn't CIA's country
Membership.objects.create(membership_country=self.usa, person=self.jane, group=self.cia)
# Jane should still not be in any groups
self.assertQuerysetEqual(
self.jane.groups.all(),
[]
)
def test_m2m_through_on_self_works(self):
self.assertQuerysetEqual(
self.jane.friends.all(),
[]
)
Friendship.objects.create(
from_friend_country=self.jane.person_country, from_friend=self.jane,
to_friend_country=self.george.person_country, to_friend=self.george)
self.assertQuerysetEqual(
self.jane.friends.all(),
['George'], attrgetter("name")
)
def test_m2m_through_on_self_ignores_mismatch_columns(self):
self.assertQuerysetEqual(self.jane.friends.all(), [])
# Note that we use ids instead of instances. This is because instances on ForeignObject
# properties will set all related field off of the given instance
Friendship.objects.create(
from_friend_id=self.jane.id, to_friend_id=self.george.id,
to_friend_country_id=self.jane.person_country_id,
from_friend_country_id=self.george.person_country_id)
self.assertQuerysetEqual(self.jane.friends.all(), [])
def test_prefetch_related_m2m_forward_works(self):
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
Membership.objects.create(membership_country=self.usa, person=self.jim, group=self.democrat)
with self.assertNumQueries(2):
members_lists = [list(g.members.all())
for g in Group.objects.prefetch_related('members')]
normal_members_lists = [list(g.members.all()) for g in Group.objects.all()]
self.assertEqual(members_lists, normal_members_lists)
def test_prefetch_related_m2m_reverse_works(self):
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
Membership.objects.create(membership_country=self.usa, person=self.jim, group=self.democrat)
with self.assertNumQueries(2):
groups_lists = [list(p.groups.all()) for p in Person.objects.prefetch_related('groups')]
normal_groups_lists = [list(p.groups.all()) for p in Person.objects.all()]
self.assertEqual(groups_lists, normal_groups_lists)
@translation.override('fi')
def test_translations(self):
a1 = Article.objects.create(pub_date=datetime.date.today())
at1_fi = ArticleTranslation(article=a1, lang='fi', title='Otsikko', body='Diipadaapa')
at1_fi.save()
at2_en = ArticleTranslation(article=a1, lang='en', title='Title', body='Lalalalala')
at2_en.save()
self.assertEqual(Article.objects.get(pk=a1.pk).active_translation, at1_fi)
with self.assertNumQueries(1):
fetched = Article.objects.select_related('active_translation').get(
active_translation__title='Otsikko')
self.assertEqual(fetched.active_translation.title, 'Otsikko')
a2 = Article.objects.create(pub_date=datetime.date.today())
at2_fi = ArticleTranslation(article=a2, lang='fi', title='Atsikko', body='Diipadaapa',
abstract='dipad')
at2_fi.save()
a3 = Article.objects.create(pub_date=datetime.date.today())
at3_en = ArticleTranslation(article=a3, lang='en', title='A title', body='lalalalala',
abstract='lala')
at3_en.save()
# Test model initialization with active_translation field.
a3 = Article(id=a3.id, pub_date=a3.pub_date, active_translation=at3_en)
a3.save()
self.assertEqual(
list(Article.objects.filter(active_translation__abstract=None)),
[a1, a3])
self.assertEqual(
list(Article.objects.filter(active_translation__abstract=None,
active_translation__pk__isnull=False)),
[a1])
with translation.override('en'):
self.assertEqual(
list(Article.objects.filter(active_translation__abstract=None)),
[a1, a2])
def test_foreign_key_raises_informative_does_not_exist(self):
referrer = ArticleTranslation()
with self.assertRaisesMessage(Article.DoesNotExist, 'ArticleTranslation has no article'):
referrer.article
def test_foreign_key_related_query_name(self):
a1 = Article.objects.create(pub_date=datetime.date.today())
ArticleTag.objects.create(article=a1, name="foo")
self.assertEqual(Article.objects.filter(tag__name="foo").count(), 1)
self.assertEqual(Article.objects.filter(tag__name="bar").count(), 0)
msg = (
"Cannot resolve keyword 'tags' into field. Choices are: "
"active_translation, active_translation_q, articletranslation, "
"id, idea_things, newsarticle, pub_date, tag"
)
with self.assertRaisesMessage(FieldError, msg):
Article.objects.filter(tags__name="foo")
def test_many_to_many_related_query_name(self):
a1 = Article.objects.create(pub_date=datetime.date.today())
i1 = ArticleIdea.objects.create(name="idea1")
a1.ideas.add(i1)
self.assertEqual(Article.objects.filter(idea_things__name="idea1").count(), 1)
self.assertEqual(Article.objects.filter(idea_things__name="idea2").count(), 0)
msg = (
"Cannot resolve keyword 'ideas' into field. Choices are: "
"active_translation, active_translation_q, articletranslation, "
"id, idea_things, newsarticle, pub_date, tag"
)
with self.assertRaisesMessage(FieldError, msg):
Article.objects.filter(ideas__name="idea1")
@translation.override('fi')
def test_inheritance(self):
na = NewsArticle.objects.create(pub_date=datetime.date.today())
ArticleTranslation.objects.create(
article=na, lang="fi", title="foo", body="bar")
self.assertSequenceEqual(
NewsArticle.objects.select_related('active_translation'),
[na]
)
with self.assertNumQueries(1):
self.assertEqual(
NewsArticle.objects.select_related(
'active_translation')[0].active_translation.title,
"foo")
@skipUnlessDBFeature('has_bulk_insert')
def test_batch_create_foreign_object(self):
objs = [Person(name="abcd_%s" % i, person_country=self.usa) for i in range(0, 5)]
Person.objects.bulk_create(objs, 10)
def test_isnull_lookup(self):
Membership.objects.create(membership_country=self.usa, person=self.bob, group_id=None)
Membership.objects.create(membership_country=self.usa, person=self.bob, group=self.cia)
self.assertQuerysetEqual(
Membership.objects.filter(group__isnull=True),
['<Membership: Bob is a member of NULL>']
)
self.assertQuerysetEqual(
Membership.objects.filter(group__isnull=False),
['<Membership: Bob is a member of CIA>']
)
class TestModelCheckTests(SimpleTestCase):
@isolate_apps('foreign_object')
def test_check_composite_foreign_object(self):
class Parent(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
class Meta:
unique_together = (('a', 'b'),)
class Child(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
value = models.CharField(max_length=255)
parent = models.ForeignObject(
Parent,
on_delete=models.SET_NULL,
from_fields=('a', 'b'),
to_fields=('a', 'b'),
related_name='children',
)
self.assertEqual(Child._meta.get_field('parent').check(from_model=Child), [])
@isolate_apps('foreign_object')
def test_check_subset_composite_foreign_object(self):
class Parent(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
c = models.PositiveIntegerField()
class Meta:
unique_together = (('a', 'b'),)
class Child(models.Model):
a = models.PositiveIntegerField()
b = models.PositiveIntegerField()
c = models.PositiveIntegerField()
d = models.CharField(max_length=255)
parent = models.ForeignObject(
Parent,
on_delete=models.SET_NULL,
from_fields=('a', 'b', 'c'),
to_fields=('a', 'b', 'c'),
related_name='children',
)
self.assertEqual(Child._meta.get_field('parent').check(from_model=Child), [])
class TestExtraJoinFilterQ(TestCase):
@translation.override('fi')
def test_extra_join_filter_q(self):
a = Article.objects.create(pub_date=datetime.datetime.today())
ArticleTranslation.objects.create(article=a, lang='fi', title='title', body='body')
qs = Article.objects.all()
with self.assertNumQueries(2):
self.assertEqual(qs[0].active_translation_q.title, 'title')
qs = qs.select_related('active_translation_q')
with self.assertNumQueries(1):
self.assertEqual(qs[0].active_translation_q.title, 'title')
|
81c87ce1c55855d33153f712bb84e1da8ffee54134a305df975ddd298079aba5 | from django.db import models
from django.utils import timezone
class Article(models.Model):
title = models.CharField(max_length=100)
pub_date = models.DateField()
pub_datetime = models.DateTimeField(default=timezone.now)
categories = models.ManyToManyField("Category", related_name="articles")
def __str__(self):
return self.title
class Comment(models.Model):
article = models.ForeignKey(Article, models.CASCADE, related_name="comments")
text = models.TextField()
pub_date = models.DateField()
approval_date = models.DateField(null=True)
def __str__(self):
return 'Comment to %s (%s)' % (self.article.title, self.pub_date)
class Category(models.Model):
name = models.CharField(max_length=255)
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.