code: def make_value_from_datastore(self, value):
      
  
      if value is None:
        return None
      _json = json.loads(value, cls=JsonDecoder)
      if self.data_type == dict:
        return _json
      return self.data_type.from_json(_json)
docs: Convert value from datastore representation.
  
      Args:
        value: datastore value.
  
      Returns:
        value to store in the model.