Refs #19722 -- Added a test for querying generic relations of a parent class.

Fixed in c9a96075fa.

tests/generic_relations/models.py

@@ -88,6 +88,10 @@ class Vegetable(models.Model):
         return self.name
 
 
+class Carrot(Vegetable):
+    pass
+
+
 @python_2_unicode_compatible
 class Mineral(models.Model):
     name = models.CharField(max_length=150)

tests/generic_relations/tests.py

@@ -10,7 +10,7 @@ from django.test import SimpleTestCase, TestCase
 from django.utils import six
 
 from .models import (
-    AllowsNullGFK, Animal, Comparison, ConcreteRelatedModel,
+    AllowsNullGFK, Animal, Carrot, Comparison, ConcreteRelatedModel,
     ForConcreteModelModel, ForProxyModelModel, Gecko, ManualPK, Mineral,
     ProxyRelatedModel, Rock, TaggedItem, ValuableRock, ValuableTaggedItem,
     Vegetable,
@@ -488,7 +488,16 @@ id="id_generic_relations-taggeditem-content_type-object_id-1-id" /></p>""" % tag
         """
         granite = Rock.objects.create(name='granite', hardness=5)
         TaggedItem.objects.create(content_object=granite, tag="countertop")
-        self.assertEqual(Rock.objects.filter(tags__tag="countertop").count(), 1)
+        self.assertEqual(Rock.objects.get(tags__tag="countertop"), granite)
+
+    def test_subclasses_with_parent_gen_rel(self):
+        """
+        Generic relations on a base class (Vegetable) work correctly in
+        subclasses (Carrot).
+        """
+        bear = Carrot.objects.create(name='carrot')
+        TaggedItem.objects.create(content_object=bear, tag='orange')
+        self.assertEqual(Carrot.objects.get(tags__tag='orange'), bear)
 
     def test_generic_inline_formsets_initial(self):
         """