Ticket #13428: allow_relation_example.diff

docs/topics/db/multi-db.txt

@@ -256 +256 @@
         def allow_relation(self, obj1, obj2, **hints):
             "Allow any relation between two objects in the db pool"
             db_list = ('master','slave1','slave2')
-            if obj1 in db_list and obj2 in db_list:
+            if obj1._state.db in db_list and obj2._state.db in db_list:
                 return True
             return None