public function attributeLabels()
{
return ['id' => 'ID', 'order_sn' => '订单编号', 'user_id' => '买家', 'store_id' => '营业点', 'school_id' => '学校', 'status' => '订单状态', 'payment' => '支付方式', 'fee' => '费用', 'real_fee' => '实付款', 'preferential' => '优惠', 'down_val' => '满减优惠金额', 'gift_val' => '满送优惠礼品', 'book_time' => '送达时间', 'remark' => '备注', 'cancelled_msg' => '取消说明', 'created_at' => '创建时间', 'updated_at' => '更新时间'];
}