def rename_model(self, old_model, new_model):
        """
        Change the label of a model attached to the Bundle

        :parameter str old_model: the current name of the model
            (must exist)
        :parameter str new_model: the desired new name of the model
            (must not exist)
        :return: None
        :raises ValueError: if the new_model is forbidden
        """
        # TODO: raise error if old_feature not found?

        self._check_label(new_model)
        self._rename_label('model', old_model, new_model)