code: def _warn_deprecated_outside_JSONField(self):  # pylint: disable=invalid-name
          
          if not isinstance(self, JSONField) and not self.warned:
              warnings.warn(
                  "Deprecated. JSONifiable fields should derive from JSONField ({name})".format(name=self.name),
                  DeprecationWarning,
                  stacklevel=3
              )
              self.warned = True
docs: Certain methods will be moved to JSONField.
  
          This warning marks calls when the object is not
          derived from that class.