Ticket #31190: test-31190.diff

tests/generic_relations/tests.py

@@ -564 +564 @@
         for tag in tags:
             self.assertSequenceEqual(tag.content_object.tags.all(), [tag])
 
+    def test_prefetch_related_custom_object_id(self):
+        tiger = Animal.objects.create(common_name='tiger')
+        cheetah = Animal.objects.create(common_name='cheetah')
+        Comparison.objects.create(
+            first_obj=cheetah, other_obj=tiger, comparative='faster',
+        )
+        Comparison.objects.create(
+            first_obj=tiger, other_obj=cheetah, comparative='cooler',
+        )
+        qs = Comparison.objects.prefetch_related('first_obj__comparisons')
+        for comparison in qs:
+            self.assertSequenceEqual(comparison.first_obj.comparisons.all(), [comparison])
+
 
 class ProxyRelatedModelTest(TestCase):
     def test_default_behavior(self):