test/app/Http/Requests/System/PermissionSaveRequest.php

<?php

namespace App\Http\Requests\System;

use App\Http\Requests\Request;
use Illuminate\Validation\Rule;

class PermissionSaveRequest extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {

        if (!$this->ajax()) {
            return [];
        }

        $addition = [];
        if ($this->route('id') == 0) { //添加时验证
            $addition['parent_id'] = 'required|numeric';
        }

        return [
                'title' => 'required',
                'rule' => 'nullable',
                'icon' => 'nullable',
                'type' => ['required', Rule::in([1, 2])],
                'sort' => 'required|numeric',
            ] + $addition;
    }


    public function attributes()
    {
        return [
            'title' => '权限名称',
            'type' => '权限类型',
            'rule' => '权限标识',

            'icon' => '图标',
            'parent_id' => '父ID',
            'sort' => '排序',
        ];
    }
}