Ticket #7252: inheritance_manager_fix.diff

a/django/db/models/manager.py

@@ -138 +138 @@
-    def __get__(self, instance, type=None):
-        if instance != None:
-            raise AttributeError, "Manager isn't accessible via %s instances" % type.__name__
+        if type is not None and self.manager.model != type:
+            self.manager.model = type
-        return self.manager
-
-class EmptyManager(Manager):