xtu_mall/app/admin/validate/user/UserGroup.php

<?php
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// | 模型验证
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namespace app\admin\validate\user;

use think\Validate;

class UserGroup extends Validate
{
    //定义验证规则
    protected $rule = [
        'name|会员组名称' => 'unique:user_group|require|chsDash|length:1,20',
        'point|积分'   => 'require|number',
    ];
}