docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'deployment') and self.deployment is not None:
              _dict['deployment'] = self.deployment
          if hasattr(self, 'user_id') and self.user_id is not None:
              _dict['user_id'] = self.user_id
          return _dict