Laravel FormRequest 閉包驗證獲取其他字段值

Laravel 有個很好用的 FormRequest , 可以把表單驗證的代碼從控制器層剝離，增加代碼的可讀性。

除了自帶的表單驗證規則外，很多時候我們需要自定義閉包規則，這有可能會用到其他字段的輸入值。

具體代碼如下：

<?php

namespace App\Http\Requests;

use App\Models\LaunchChannelContactWay;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Http\Request;

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){//自定義驗證閉包
                            $unique=LaunchChannelContactWay::query()
                                ->where('launch_channel_id',$value)
                                ->where('activity_name',$this->input('activity_name'))//獲取activity_name字段值
                                ->count();
                            if($unique>0){
                                $fail('渠道活動配置已存在');
                            }
                    }],                   
                ];
                break;           
            default:
                $rules = [];
                break;
        }
        return $rules;
    }
}

Enjoy it !