xtu_mall/app/admin/validate/AdminUser.php

<?php
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// | 登录验证
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namespace app\admin\validate;

use think\Validate;

class AdminUser extends Validate
{

    //定义验证规则
    protected $rule = [
        'username|用户名' => 'unique:admin|require|alphaDash|length:3,20',
        'password|密码'  => 'require|length:3,20|confirm',
        'email|邮箱'     => 'email|unique:admin',
        'mobile|手机'    => 'mobile|unique:admin',
        'group|权限组'    => 'require',
    ];

    // 登录验证场景定义
    public function sceneUpdate()
    {
        return $this->only(['username', 'password', 'email', 'mobile'])
            ->remove('password', 'require');
    }

    //定义验证场景
    protected $scene = [
        'insert' => ['username', 'password', 'email', 'mobile'],

    ];

}