mingde-bd/application/common/validate/AttendanceMachine.php

<?php
namespace app\common\validate;

use think\Db;
use think\Validate;

class AttendanceMachine extends Validate{

    protected $rule = [
        'sn|设备编号'  =>  'require|max:30|checkUnique',
//        'org_id|所属项目'  =>  'require|gt:0',
    ];


    protected function checkUnique($value,$rule,$data=[])
    {
        $info = Db::name('attendance_machine')
            ->where('sn',$value)
            ->where('del',0)
            ->find();
        if($data['id'] <= 0 && $info){
            return '设备编号已被使用';
        }
        if($info && $data['id'] > 0 && $info['id'] != $data['id']){
            return '设备编号已被使用';
        }
        return true;
    }

}