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