Ticket #16458: models_equality-16458.diff

django/db/models/base.py

@@ -382 +382 @@
         return '%s object' % self.__class__.__name__
 
     def __eq__(self, other):
-        return isinstance(other, self.__class__) and self._get_pk_val() == other._get_pk_val()
+        return (isinstance(other, self.__class__) or isinstance(self, other.__class__)) and \
+                (self._get_pk_val() == other._get_pk_val())
 
     def __ne__(self, other):
         return not self.__eq__(other)