Fixed #12121 -- Modified __reduce__ on a model to avoid an infinite recursion...

        only module-level classes can be pickled by the default path.

        """

        data = self.__dict__

        if not self._deferred:

            return super(Model, self).__reduce__()

        model = self.__class__

        # The obvious thing to do here is to invoke super().__reduce__()

        # for the non-deferred case. Don't do that.

        # On Python 2.4, there is something wierd with __reduce__,

        # and as a result, the super call will cause an infinite recursion.

        # See #10547 and #12121.

        defers = []

        pk_val = None

        if self._deferred:

            for field in self._meta.fields:

                if isinstance(self.__class__.__dict__.get(field.attname),

                        DeferredAttribute):