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本文介紹了如何在 Laravel 5.1 中強制 FormRequest 返回 json?的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我正在使用 FormRequest 來驗證從我的 API 調用中發送的智能手機應用程序.所以，我希望 FormRequest 在驗證失敗時總是返回 json.

I'm using FormRequest to validate from which is sent in an API call from my smartphone app. So, I want FormRequest alway return json when validation fail.

看到如下Laravel框架的源碼，如果reqeust是Ajax或者wantJson，FormRequest的默認行為是返回json.

I saw the following source code of Laravel framework, the default behaviour of FormRequest is return json if reqeust is Ajax or wantJson.

//IlluminateFoundationHttpFormRequest class
/**
 * Get the proper failed validation response for the request.
 *
 * @param  array  $errors
 * @return SymfonyComponentHttpFoundationResponse
 */
public function response(array $errors)
{
    if ($this->ajax() || $this->wantsJson()) {
        return new JsonResponse($errors, 422);
    }

    return $this->redirector->to($this->getRedirectUrl())
                                    ->withInput($this->except($this->dontFlash))
                                    ->withErrors($errors, $this->errorBag);
}

我知道我可以在請求標頭中添加 Accept= application/json.FormRequest 將返回 json.但是我想提供一種更簡單的方法來通過默認支持 json 來請求我的 API，而無需設置任何標頭.所以，我試圖在 IlluminateFoundationHttpFormRequest 類中找到一些強制 FormRequest 響應 json 的選項.但是我沒有找到任何默認支持的選項.

I knew that I can add Accept= application/json in request header. FormRequest will return json. But I want to provide an easier way to request my API by support json in default without setting any header. So, I tried to find some options to force FormRequest response json in IlluminateFoundationHttpFormRequest class. But I didn't find any options which are supported in default.

我試圖覆蓋我的應用程序請求抽象類，如下所示:

I tried to overwrite my application request abstract class like followings:

<?php

namespace Laravel5CgHttpRequests;

use IlluminateFoundationHttpFormRequest;
use IlluminateHttpJsonResponse;

abstract class Request extends FormRequest
{
    /**
     * Force response json type when validation fails
     * @var bool
     */
    protected $forceJsonResponse = false;

    /**
     * Get the proper failed validation response for the request.
     *
     * @param  array  $errors
     * @return SymfonyComponentHttpFoundationResponse
     */
    public function response(array $errors)
    {
        if ($this->forceJsonResponse || $this->ajax() || $this->wantsJson()) {
            return new JsonResponse($errors, 422);
        }

        return $this->redirector->to($this->getRedirectUrl())
            ->withInput($this->except($this->dontFlash))
            ->withErrors($errors, $this->errorBag);
    }
}

我添加了 protected $forceJsonResponse = false; 來設置我們是否需要強制響應 json.并且，在從 Request 抽象類擴展的每個 FormRequest 中.我設置了那個選項.

I added protected $forceJsonResponse = false; to setting if we need to force response json or not. And, in each FormRequest which is extends from Request abstract class. I set that option.

例如:我創建了一個 StoreBlogPostRequest 并為此 FormRequest 設置了 $forceJsoResponse=true 并使其響應為 json.

Eg: I made an StoreBlogPostRequest and set $forceJsoResponse=true for this FormRequest and make it response json.

<?php

namespace Laravel5CgHttpRequests;

use Laravel5CgHttpRequestsRequest;

class StoreBlogPostRequest extends Request
{

    /**
     * Force response json type when validation fails
     * @var bool
     */

     protected $forceJsonResponse = true;
    /**
     * 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()
    {
        return [
            'title' => 'required|unique:posts|max:255',
            'body' => 'required',
        ];
    }
}

解決方案 2:添加中間件并強制更改請求標頭

我構建了一個如下所示的中間件:

Solution 2: Add an Middleware and force change request header

I build a middleware like followings:

namespace Laravel5CgHttpMiddleware;

use Closure;
use SymfonyComponentHttpFoundationHeaderBag;

class AddJsonAcceptHeader
{
    /**
     * Add Json HTTP_ACCEPT header for an incoming request.
     *
     * @param  IlluminateHttpRequest  $request
     * @param  Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $request->server->set('HTTP_ACCEPT', 'application/json');
        $request->headers = new HeaderBag($request->server->getHeaders());
        return $next($request);
    }
}

這是工作.但我想知道這個解決方案好嗎?在這種情況下，是否有任何 Laravel 方式可以幫助我?

It 's work. But I wonder is this solutions good? And are there any Laravel Way to help me in this situation ?

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如何在 Laravel 5.1 中強制 FormRequest 返回 json?

問題描述

解決方案 2:添加中間件并強制更改請求標頭

Solution 2: Add an Middleware and force change request header

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