Ticket #11116: 11116_model_proxy_delete_with_test.diff

django/db/models/base.py

@@ -538 +538 @@
         # traversing to the most remote parent classes -- those with no parents
         # themselves -- and then adding those instances to the collection. That
         # will include all the child instances down to "self".
-        parent_stack = self._meta.parents.values()
+        parent_stack = filter(None, self._meta.parents.values())
         while parent_stack:
             link = parent_stack.pop()
             parent_obj = getattr(self, link.name)

tests/modeltests/proxy_models/models.py

@@ -275 +275 @@
 [<UserProxy: Bruce>]
 >>> UserProxyProxy.objects.all()
 [<UserProxyProxy: Bruce>]
+>>> u2 = UserProxy.objects.create(name='Try to delete me')
+>>> u2.delete()
 
 # We can still use `select_related()` to include related models in our querysets.
 >>> country = Country.objects.create(name='Australia')