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