Fixed #9546: GenericRelations inherited from base models no longer query using the wrong content type.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10373 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/contenttypes/generic.py

@@ -203,7 +203,7 @@ class ReverseGenericRelatedObjectsDescriptor(object):
             join_table = qn(self.field.m2m_db_table()),
             source_col_name = qn(self.field.m2m_column_name()),
             target_col_name = qn(self.field.m2m_reverse_name()),
-            content_type = ContentType.objects.get_for_model(self.field.model),
+            content_type = ContentType.objects.get_for_model(instance),
             content_type_field_name = self.field.content_type_field_name,
             object_id_field_name = self.field.object_id_field_name
         )

tests/regressiontests/generic_relations_regress/models.py

@@ -0,0 +1,22 @@
+from django.db import models
+from django.contrib.contenttypes import generic
+from django.contrib.contenttypes.models import ContentType
+
+class Link(models.Model):
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+    content_object = generic.GenericForeignKey()
+
+    def __unicode__(self):
+        return "Link to %s id=%s" % (self.content_type, self.object_id)
+
+class Place(models.Model):
+    name = models.CharField(max_length=100)
+    links = generic.GenericRelation(Link)
+    
+    def __unicode__(self):
+        return "Place: %s" % self.name
+    
+class Restaurant(Place): 
+    def __unicode__(self):
+        return "Restaurant: %s" % self.name

tests/regressiontests/generic_relations_regress/tests.py

@@ -0,0 +1,19 @@
+from django.test import TestCase
+from django.contrib.contenttypes.models import ContentType
+from models import Link, Place, Restaurant
+
+class GenericRelationTests(TestCase):
+    
+    def test_inherited_models_content_type(self):
+        """
+        Test that GenericRelations on inherited classes use the correct content
+        type.
+        """
+        
+        p = Place.objects.create(name="South Park")
+        r = Restaurant.objects.create(name="Chubby's")        
+        l1 = Link.objects.create(content_object=p)
+        l2 = Link.objects.create(content_object=r)
+        self.assertEqual(list(p.links.all()), [l1])
+        self.assertEqual(list(r.links.all()), [l2])
+