CREATE FUNCTION _api.post_delete() RETURNS TRIGGER LANGUAGE plpgsql VOLATILE AS $BODY$ DECLARE _user_id INTEGER; BEGIN _user_id = _api.get_user_id(); IF OLD.user_id <> _user_id THEN PERFORM _api.raise_deny(); END IF; DELETE FROM admin.post WHERE user_id = _user_id AND id = OLD.id; END $BODY$; GRANT EXECUTE ON FUNCTION _api.post_delete() TO rest_user; GRANT DELETE ON TABLE api.post TO rest_user; GRANT DELETE ON TABLE admin.post TO rest_user; CREATE TRIGGER api_post_delete_trgr INSTEAD OF DELETE ON api.post FOR EACH ROW EXECUTE PROCEDURE _api.post_delete();