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