screen/application/common/model/UserCoupon.php

<?php

namespace app\common\model;

use think\Model;


class UserCoupon extends Model
{
    protected $autoWriteTimestamp=true;
    protected $updateTime=null;

    public function bindGoods(){
        return $this->hasMany(UserCouponGoods::class);
    }

    protected static function init()
    {
        self::beforeWrite(function (self $coupon){
            if($coupon['type']==2){
                unset($coupon['amount_full']);
            }
        });
    }
}