yanglao/application/api/model/service/PackageOrderDetail.php

<?php

namespace app\api\model\service;

use think\Model;
class PackageOrderDetail extends Model
{
    // 表名
    protected $name = 'service_package_order_detail';

    // 自动写入时间戳字段
    protected $autoWriteTimestamp = 'int';

    // 定义时间戳字段名
    protected $createTime = 'createtime';
    protected $updateTime = 'updatetime';

    public static function getRefundPrice($order)
    {
        return bcsub($order['payprice'],Order::where(['ordertype'=>1,'package_order_id'=>$order['id']])->sum('payprice'),2);
    }

}