Laravel FormRequest 闭包验证获取其他字段值

Laravel 有个很好用的 FormRequest , 可以把表单验证的代码从控制器层剥离，增加代码的可读性。

除了自带的表单验证规则外，很多时候我们需要自定义闭包规则，这有可能会用到其他字段的输入值。

具体代码如下：

<?php

namespace AppHttpRequests;

use AppModelsLaunchChannelContactWay;
use IlluminateFoundationHttpFormRequest;
use IlluminateHttpRequest;

class LaunchRequest extends FormRequest
{
    /**
     * 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()
    {
        $path = Request::getPathInfo();
        switch ($path){            
            case '/api/add_launch_channel_contact_way':               
                $rules=[
                    'channel_id'=>[
                        'required',
                        'int',
                        'exists:launch_channels,id',
                        function($attribute, $value, $fail){//自定义验证闭包
                            $unique=LaunchChannelContactWay::query()
                                ->where('launch_channel_id',$value)
                                ->where('activity_name',$this->input('activity_name'))//获取activity_name字段值
                                ->count();
                            if($unique>0){
                                $fail('渠道活动配置已存在');
                            }
                    }],                   
                ];
                break;           
            default:
                $rules = [];
                break;
        }
        return $rules;
    }
}

Enjoy it !