Return a json dictionary representing this model.

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