text: 
  from django.conf import settings
  from django.db import models
  from django.core.files.storage import default_storage
  from django.contrib.auth.models import User
  
  class MyFileField(models.FileField): 
      pass 
  
  class Member(models.Model):
      name = models.CharField(max_length=100)
      birthdate = models.DateTimeField(blank=True, null=True)
      gender = models.CharField(max_length=1, blank=True, choices=[('M','Male'), ('F', 'Female')])
  
      def __unicode__(self):
          return self.name
  
  class Band(models.Model):
      name = models.CharField(max_length=100)
      members = models.ManyToManyField(Member)
  
      def __unicode__(self):
          return self.name
  
  class Album(models.Model):
      band = models.ForeignKey(Band)
      name = models.CharField(max_length=100)
      cover_art = models.FileField(upload_to='albums')
      backside_art = MyFileField(upload_to='albums_back', null=True)
  
      def __unicode__(self):
          return self.name
  
  class HiddenInventoryManager(models.Manager):
      def get_query_set(self):
          return super(HiddenInventoryManager, self).get_query_set().filter(hidden=False)
  
  class Inventory(models.Model):
     barcode = models.PositiveIntegerField(unique=True)
     parent = models.ForeignKey('self', to_field='barcode', blank=True, null=True)
     name = models.CharField(blank=False, max_length=20)
     hidden = models.BooleanField(default=False)
  
     # see #9258
     default_manager = models.Manager()
     objects = HiddenInventoryManager()
  
     def __unicode__(self):
        return self.name
  
  class Event(models.Model):
      band = models.ForeignKey(Band, limit_choices_to=models.Q(pk__gt=0))
      start_date = models.DateField(blank=True, null=True)
      start_time = models.TimeField(blank=True, null=True)
      description = models.TextField(blank=True)
      link = models.URLField(blank=True)
      min_age = models.IntegerField(blank=True, null=True)
  
  class Car(models.Model):
      owner = models.ForeignKey(User)
      make = models.CharField(max_length=30)
      model = models.CharField(max_length=30)
  
      def __unicode__(self):
          return u"%s %s" % (self.make, self.model)
  
  class CarTire(models.Model):
      """
      A single car tire. This to test that a user can only select their own cars.
      """
      car = models.ForeignKey(Car)
  
  __test__ = {'WIDGETS_TESTS': """
  >>> from datetime import datetime
  >>> from django.utils.html import escape, conditional_escape
  >>> from django.core.files.uploadedfile import SimpleUploadedFile
  >>> from django.contrib.admin.widgets import FilteredSelectMultiple, AdminSplitDateTime
  >>> from django.contrib.admin.widgets import AdminFileWidget, ForeignKeyRawIdWidget, ManyToManyRawIdWidget
  >>> from django.contrib.admin.widgets import RelatedFieldWidgetWrapper
  >>> from django.utils.translation import activate, deactivate
  >>> from django.conf import settings
  
  
  Calling conditional_escape on the output of widget.render will simulate what
  happens in the template. This is easier than setting up a template and context
  for each test.
  
  Make sure that the Admin widgets render properly, that is, without their extra
  HTML escaped.
  
  >>> w = FilteredSelectMultiple('test', False)
  >>> print conditional_escape(w.render('test', 'test'))
  <select multiple="multiple" name="test" class="selectfilter">
  </select><script type="text/javascript">addEvent(window, "load", function(e) {SelectFilter.init("id_test", "test", 0, "%(ADMIN_MEDIA_PREFIX)s"); });</script>
  <BLANKLINE>
  
  >>> w = FilteredSelectMultiple('test', True)
  >>> print conditional_escape(w.render('test', 'test'))
  <select multiple="multiple" name="test" class="selectfilterstacked">
  </select><script type="text/javascript">addEvent(window, "load", function(e) {SelectFilter.init("id_test", "test", 1, "%(ADMIN_MEDIA_PREFIX)s"); });</script>
  <BLANKLINE>
  
  >>> w = AdminSplitDateTime()
  >>> print conditional_escape(w.render('test', datetime(2007, 12, 1, 9, 30)))
  <p class="datetime">Date: <input value="2007-12-01" type="text" class="vDateField" name="test_0" size="10" /><br />Time: <input value="09:30:00" type="text" class="vTimeField" name="test_1" size="8" /></p>
  >>> activate('de-at')
  >>> settings.USE_L10N = True
  >>> print conditional_escape(w.render('test', datetime(2007, 12, 1, 9, 30)))
  <p class="datetime">Datum: <input value="01.12.2007" type="text" class="vDateField" name="test_0" size="10" /><br />Zeit: <input value="09:30:00" type="text" class="vTimeField" name="test_1" size="8" /></p>
  >>> deactivate()
  >>> settings.USE_L10N = False
  
  >>> band = Band.objects.create(pk=1, name='Linkin Park')
  >>> album = band.album_set.create(name='Hybrid Theory', cover_art=r'albums\hybrid_theory.jpg')
  
  >>> w = AdminFileWidget()
  >>> print conditional_escape(w.render('test', album.cover_art))
  Currently: <a target="_blank" href="%(STORAGE_URL)salbums/hybrid_theory.jpg">albums\hybrid_theory.jpg</a> <br />Change: <input type="file" name="test" />
  >>> print conditional_escape(w.render('test', SimpleUploadedFile('test', 'content')))
  <input type="file" name="test" />
  
  >>> rel = Album._meta.get_field('band').rel
  >>> w = ForeignKeyRawIdWidget(rel)
  >>> print conditional_escape(w.render('test', band.pk, attrs={}))
  <input type="text" name="test" value="1" class="vForeignKeyRawIdAdminField" /><a href="../../../admin_widgets/band/?t=id" class="related-lookup" id="lookup_id_test" onclick="return showRelatedObjectLookupPopup(this);"> <img src="%(ADMIN_MEDIA_PREFIX)simg/admin/selector-search.gif" width="16" height="16" alt="Lookup" /></a>&nbsp;<strong>Linkin Park</strong>
  
  >>> m1 = Member.objects.create(pk=1, name='Chester')
  >>> m2 = Member.objects.create(pk=2, name='Mike')
  >>> band.members.add(m1, m2)
  
  >>> rel = Band._meta.get_field('members').rel
  >>> w = ManyToManyRawIdWidget(rel)
  >>> print conditional_escape(w.render('test', [m1.pk, m2.pk], attrs={}))
  <input type="text" name="test" value="1,2" class="vManyToManyRawIdAdminField" /><a href="../../../admin_widgets/member/" class="related-lookup" id="lookup_id_test" onclick="return showRelatedObjectLookupPopup(this);"> <img src="%(ADMIN_MEDIA_PREFIX)simg/admin/selector-search.gif" width="16" height="16" alt="Lookup" /></a>
  >>> w._has_changed(None, None)
  False
  >>> w._has_changed([], None)
  False
  >>> w._has_changed(None, [u'1'])
  True
  >>> w._has_changed([1, 2], [u'1', u'2'])
  False
  >>> w._has_changed([1, 2], [u'1'])
  True
  >>> w._has_changed([1, 2], [u'1', u'3'])
  True
  
  # Check that ForeignKeyRawIdWidget works with fields which aren't related to
  # the model's primary key.
  >>> apple = Inventory.objects.create(barcode=86, name='Apple')
  >>> pear = Inventory.objects.create(barcode=22, name='Pear')
  >>> core = Inventory.objects.create(barcode=87, name='Core', parent=apple)
  >>> rel = Inventory._meta.get_field('parent').rel
  >>> w = ForeignKeyRawIdWidget(rel)
  >>> print w.render('test', core.parent_id, attrs={})
  <input type="text" name="test" value="86" class="vForeignKeyRawIdAdminField" /><a href="../../../admin_widgets/inventory/?t=barcode" class="related-lookup" id="lookup_id_test" onclick="return showRelatedObjectLookupPopup(this);"> <img src="%(ADMIN_MEDIA_PREFIX)simg/admin/selector-search.gif" width="16" height="16" alt="Lookup" /></a>&nbsp;<strong>Apple</strong>
  
  # see #9258
  >>> hidden = Inventory.objects.create(barcode=93, name='Hidden', hidden=True)
  >>> child_of_hidden = Inventory.objects.create(barcode=94, name='Child of hidden', parent=hidden)
  >>> print w.render('test', child_of_hidden.parent_id, attrs={})
  <input type="text" name="test" value="93" class="vForeignKeyRawIdAdminField" /><a href="../../../admin_widgets/inventory/?t=barcode" class="related-lookup" id="lookup_id_test" onclick="return showRelatedObjectLookupPopup(this);"> <img src="%(ADMIN_MEDIA_PREFIX)simg/admin/selector-search.gif" width="16" height="16" alt="Lookup" /></a>&nbsp;<strong>Hidden</strong>
  """ % {
      'ADMIN_MEDIA_PREFIX': settings.ADMIN_MEDIA_PREFIX,
      'STORAGE_URL': default_storage.url(''),
  }}
  