prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Bug in project document category API
  ## Test plan
  
  The project_document_category should not give an error. E.g. `http://rsr.localdev.akvo.org/rest/v1/project_document_category/` should load.
  ## Issue description
  
  The project document category API gives an error. See http://sentry.support.akvo-ops.org/rsr/test/group/879/, or on the Test server: http://rsr.test.akvo.org/rest/v1/project_document_category/.
  
  
  </issue>
  <code>
  [start of akvo/rest/views/project_document.py]
  1 # -*- coding: utf-8 -*-
  2 
  3 # Akvo RSR is covered by the GNU Affero General Public License.
  4 # See more details in the license.txt file located at the root folder of the Akvo RSR module.
  5 # For additional details on the GNU license please see < http://www.gnu.org/licenses/agpl.html >.
  6 
  7 
  8 from akvo.rsr.models import ProjectDocument, ProjectDocumentCategory
  9 
  10 from ..serializers import ProjectDocumentSerializer, ProjectDocumentCategorySerializer
  11 from ..viewsets import PublicProjectViewSet
  12 
  13 
  14 class ProjectDocumentViewSet(PublicProjectViewSet):
  15     """
  16     """
  17     queryset = ProjectDocument.objects.all()
  18     serializer_class = ProjectDocumentSerializer
  19 
  20 
  21 class ProjectDocumentCategoryViewSet(PublicProjectViewSet):
  22     """
  23     """
  24     queryset = ProjectDocumentCategory.objects.all()
  25     serializer_class = ProjectDocumentCategorySerializer
  26     filter_fields = ('document__project', 'document', 'category', )
  27
  [end of akvo/rest/views/project_document.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/akvo/rest/views/project_document.py b/akvo/rest/views/project_document.py
  --- a/akvo/rest/views/project_document.py
  +++ b/akvo/rest/views/project_document.py
  @@ -24,3 +24,4 @@
       queryset = ProjectDocumentCategory.objects.all()
       serializer_class = ProjectDocumentCategorySerializer
       filter_fields = ('document__project', 'document', 'category', )
  +    project_relation = 'document__project__'
  
verification_info: {"golden_diff": "diff --git a/akvo/rest/views/project_document.py b/akvo/rest/views/project_document.py\n--- a/akvo/rest/views/project_document.py\n+++ b/akvo/rest/views/project_document.py\n@@ -24,3 +24,4 @@\n     queryset = ProjectDocumentCategory.objects.all()\n     serializer_class = ProjectDocumentCategorySerializer\n     filter_fields = ('document__project', 'document', 'category', )\n+    project_relation = 'document__project__'\n", "issue": "Bug in project document category API\n## Test plan\n\nThe project_document_category should not give an error. E.g. `http://rsr.localdev.akvo.org/rest/v1/project_document_category/` should load.\n## Issue description\n\nThe project document category API gives an error. See http://sentry.support.akvo-ops.org/rsr/test/group/879/, or on the Test server: http://rsr.test.akvo.org/rest/v1/project_document_category/.\n\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n\n# Akvo RSR is covered by the GNU Affero General Public License.\n# See more details in the license.txt file located at the root folder of the Akvo RSR module.\n# For additional details on the GNU license please see < http://www.gnu.org/licenses/agpl.html >.\n\n\nfrom akvo.rsr.models import ProjectDocument, ProjectDocumentCategory\n\nfrom ..serializers import ProjectDocumentSerializer, ProjectDocumentCategorySerializer\nfrom ..viewsets import PublicProjectViewSet\n\n\nclass ProjectDocumentViewSet(PublicProjectViewSet):\n    \"\"\"\n    \"\"\"\n    queryset = ProjectDocument.objects.all()\n    serializer_class = ProjectDocumentSerializer\n\n\nclass ProjectDocumentCategoryViewSet(PublicProjectViewSet):\n    \"\"\"\n    \"\"\"\n    queryset = ProjectDocumentCategory.objects.all()\n    serializer_class = ProjectDocumentCategorySerializer\n    filter_fields = ('document__project', 'document', 'category', )\n", "path": "akvo/rest/views/project_document.py"}]}