Get the latest representation of the current model.

def refresh(self):
        """Get the latest representation of the current model."""
        client = self._get_client()
        endpoint = self._endpoint.format(
            resource_id=self.resource_id or "",
            parent_id=self.parent_id or "",
            grandparent_id=self.grandparent_id or "")
        response = client.get_resource(endpoint)
        self._reset_model(response)