code: def _get(self, *args, **kwargs):
          
          is_authenticated = self.get_user().is_authenticated
          if callable(is_authenticated):
              is_authenticated = is_authenticated()
          if is_authenticated is not True:
              return [], False
          return self._message_queryset(), False
docs: Retrieves a list of stored messages. Returns a tuple of the messages
          and a flag indicating whether or not all the messages originally
          intended to be stored in this storage were, in fact, stored and
          retrieved; e.g., ``(messages, all_retrieved)``.