def delete(self, uid):
"""
@apiDescription 删除评分
@api {delete} /shop/([0-9]+)/foods/grades/? 删除评分
@apiGroup grade
@apiPermission user
"""
gid = int(self.get_argument("gid"))
uid = self.get_current_user()
Grade.delete(self.orm_session, uid, gid)
self.write({})
