sqlalchemy.py 文件源码

def on_delete(self, req, resp, *args, **kwargs):
        try:
            with self.session_scope(self.db_engine) as db_session:
                obj = self.get_object(req, resp, kwargs, for_update=True, db_session=db_session)

                self.delete(req, resp, obj, db_session)
        except (IntegrityError, ProgrammingError) as err:
            # This should only be caused by foreign key constraint being violated
            if isinstance(err, IntegrityError) or err.orig.args[1] == self.VIOLATION_FOREIGN_KEY:
                raise HTTPConflict('Conflict', 'Other content links to this')
            else:
                raise

        self.render_response({}, req, resp)