apisongcan/application/index/validate/RoleValidate.php

<?php
// +----------------------------------------------------------------------
// | snake
// +----------------------------------------------------------------------
// | Copyright (c) 2016~2022 http://baiyf.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: NickBai <1902822973@qq.com>
// +----------------------------------------------------------------------
namespace app\index\validate;

use think\Validate;

class RoleValidate extends Validate
{
    protected $rule = array(
        'role_name'   => 'require|unique:role',
    );
    protected $message = array(
        'role_name.require'    => '角色已经存在',
    );
}