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