Detach models from the relationship.

def detach(self, ids=None, touch=True):
        """
        Detach models from the relationship.
        """
        if isinstance(ids, orator.orm.model.Model):
            ids = ids.get_key()

        if ids is None:
            ids = []

        query = self._new_pivot_query()

        if not isinstance(ids, list):
            ids = [ids]

        if len(ids) > 0:
            query.where_in(self._other_key, ids)

        if touch:
            self.touch_if_touching()

        results = query.delete()

        return results