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