Appended an _id suffix to all related field names in the rest api

Fixes #1597

openslides/utils/rest_api.py

@@ -1,4 +1,5 @@
 import re
+from collections import OrderedDict
 from urllib.parse import urlparse
 
 from rest_framework.decorators import detail_route, list_route  # noqa
@@ -6,14 +7,16 @@ from rest_framework.metadata import SimpleMetadata  # noqa
 from rest_framework.mixins import DestroyModelMixin, UpdateModelMixin  # noqa
 from rest_framework.response import Response  # noqa
 from rest_framework.routers import DefaultRouter
+from rest_framework.serializers import ModelSerializer as _ModelSerializer
 from rest_framework.serializers import (  # noqa
+    MANY_RELATION_KWARGS,
     CharField,
     DictField,
     Field,
     IntegerField,
     ListField,
     ListSerializer,
-    ModelSerializer,
+    ManyRelatedField,
     PrimaryKeyRelatedField,
     RelatedField,
     SerializerMethodField,
@@ -30,6 +33,83 @@ from .exceptions import OpenSlidesError
 router = DefaultRouter()
 
 
+class IdManyRelatedField(ManyRelatedField):
+    """
+    ManyRelatedField that appends an suffix to the sub-fields.
+
+    Only works together with the IdPrimaryKeyRelatedField and our
+    ModelSerializer.
+    """
+    field_name_suffix = '_id'
+
+    def bind(self, field_name, parent):
+        """
+        Called when the field is bound to the serializer.
+
+        See IdPrimaryKeyRelatedField for more informations.
+        """
+        self.source = field_name[:-len(self.field_name_suffix)]
+        super().bind(field_name, parent)
+
+
+class IdPrimaryKeyRelatedField(PrimaryKeyRelatedField):
+    """
+    Field, that renames the field name to FIELD_NAME_id.
+
+    Only works together the our ModelSerializer.
+    """
+    field_name_suffix = '_id'
+
+    def bind(self, field_name, parent):
+        """
+        Called when the field is bound to the serializer.
+
+        Changes the source so that the original field name is used (removes
+        the _id suffix).
+        """
+        if field_name:
+            # field_name is an empty string when the field is created with the
+            # attribute many=True. In this case the suffix is added with the
+            # IdManyRelatedField class.
+            self.source = field_name[:-len(self.field_name_suffix)]
+        super().bind(field_name, parent)
+
+    @classmethod
+    def many_init(cls, *args, **kwargs):
+        """
+        Method from rest_framework.relations.RelatedField That uses our
+        IdManyRelatedField class instead of
+        rest_framework.relations.ManyRelatedField class.
+        """
+        list_kwargs = {'child_relation': cls(*args, **kwargs)}
+        for key in kwargs.keys():
+            if key in MANY_RELATION_KWARGS:
+                list_kwargs[key] = kwargs[key]
+        return IdManyRelatedField(**list_kwargs)
+
+
+class ModelSerializer(_ModelSerializer):
+    """
+    ModelSerializer that changes the field names of related fields to
+    FIELD_NAME_id.
+    """
+    serializer_related_field = IdPrimaryKeyRelatedField
+
+    def get_fields(self):
+        """
+        Returns all fields of the serializer.
+        """
+        fields = OrderedDict()
+
+        for field_name, field in super().get_fields().items():
+            try:
+                field_name += field.field_name_suffix
+            except AttributeError:
+                pass
+            fields[field_name] = field
+        return fields
+
+
 class PermissionMixin:
     """
     Mixin for subclasses of APIView like GenericViewSet and ModelViewSet.

tests/integration/motions/test_viewset.py

@@ -52,7 +52,7 @@ class CreateMotion(TestCase):
             reverse('motion-list'),
             {'title': 'test_title_Air0bahchaiph1ietoo2',
              'text': 'test_text_chaeF9wosh8OowazaiVu',
-             'category': category.pk})
+             'category_id': category.pk})
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         motion = Motion.objects.get()
         self.assertEqual(motion.category, category)
@@ -69,7 +69,7 @@ class CreateMotion(TestCase):
             reverse('motion-list'),
             {'title': 'test_title_pha7moPh7quoth4paina',
              'text': 'test_text_YooGhae6tiangung5Rie',
-             'submitters': [submitter_1.pk, submitter_2.pk]})
+             'submitters_id': [submitter_1.pk, submitter_2.pk]})
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         motion = Motion.objects.get()
         self.assertEqual(motion.submitters.count(), 2)
@@ -82,7 +82,7 @@ class CreateMotion(TestCase):
             reverse('motion-list'),
             {'title': 'test_title_Oecee4Da2Mu9EY6Ui4mu',
              'text': 'test_text_FbhgnTFgkbjdmvcjbffg',
-             'supporters': [supporter.pk]})
+             'supporters_id': [supporter.pk]})
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         motion = Motion.objects.get()
         self.assertEqual(motion.supporters.get().username, 'test_username_ahGhi4Quohyee7ohngie')
@@ -93,7 +93,7 @@ class CreateMotion(TestCase):
             reverse('motion-list'),
             {'title': 'test_title_Hahke4loos4eiduNiid9',
              'text': 'test_text_johcho0Ucaibiehieghe',
-             'tags': [tag.pk]})
+             'tags_id': [tag.pk]})
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         motion = Motion.objects.get()
         self.assertEqual(motion.tags.get().name, 'test_tag_iRee3kiecoos4rorohth')
@@ -147,7 +147,7 @@ class UpdateMotion(TestCase):
             password='test_password_XaeTe3aesh8ohg6Cohwo')
         response = self.client.patch(
             reverse('motion-detail', args=[self.motion.pk]),
-            {'supporters': [supporter.pk]})
+            {'supporters_id': [supporter.pk]})
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         motion = Motion.objects.get()
         self.assertEqual(motion.title, 'test_title_aeng7ahChie3waiR8xoh')