Laravel中使用FormRequest进行表单验证方法及问题汇总

<?php// ... use Validator;class CommentController{  public function postStoreComment(Request $request)  {    $validator = Validator::make($request->all(), [      'comment' => 'required', // 只是实例，就写个简单的规则，你的网站要是这么写欢迎在评论里贴网址    ]);    if ($validator->fails()) {      return redirect()        ->back()        ->withErrors($validator)        ->withInput();    }  }

<?phpnamespace App/Http/Requests;use App/Http/Requests/Request; // 可以看到，这个基类是在我们的项目中的，这意味着我们可以修改它class StoreCommentRequest extends Request{  /**   * Determine if the user is authorized to make this request.   *   * @return bool   */  public function authorize() // 这个方法可以用来控制访问权限，例如禁止未付费用户评论…  {    return false; // 注意！这里默认是false，记得改成true  }  /**   * Get the validation rules that apply to the request.   *   * @return array   */  public function rules() // 这个方法返回验证规则数组，也就是Validator的验证规则  {    return [      //    ];  }}

<?php// ...  public function rules()  {    return [    ];  }// ...

<?php// ...  // 之前：public function postStoreComment(Request $request)  public function postStoreComment(/App/Http/Requests/StoreCommentRequest $request)  {    // ...  }// ...

<?phpnamespace Illuminate/Validation;use Illuminate/Support/ServiceProvider;use Illuminate/Contracts/Validation/ValidatesWhenResolved;class ValidationServiceProvider extends ServiceProvider{  /**   * Register the service provider.   *   * @return void   */  public function register()  {    $this->registerValidationResolverHook(); // 看我看我看我    $this->registerPresenceVerifier();    $this->registerValidationFactory();  }  /**   * Register the "ValidatesWhenResolved" container hook.   *   * @return void   */  protected function registerValidationResolverHook() // 对，就是我  {    // 这里可以看到对`ValidatesWhenResolved`的实现做了一个监听    $this->app->afterResolving(function (ValidatesWhenResolved $resolved) {      $resolved->validate(); // 然后调用了它的`validate`方法进行验证    });  }// ...

<?php namespace Illuminate/Foundation/Http;use Illuminate/Http/Request;use Illuminate/Http/Response;use Illuminate/Http/JsonResponse;use Illuminate/Routing/Redirector;use Illuminate/Container/Container;use Illuminate/Contracts/Validation/Validator;use Illuminate/Http/Exception/HttpResponseException;use Illuminate/Validation/ValidatesWhenResolvedTrait;use Illuminate/Contracts/Validation/ValidatesWhenResolved; // 是你use Illuminate/Contracts/Validation/Factory as ValidationFactory;// 我们`app/Http/Requests/Request`便是继承于这个`FormRequest`类class FormRequest extends Request implements ValidatesWhenResolved // 就是你{  use ValidatesWhenResolvedTrait; // 这个我们待会儿也要看看  // ...

<?phpnamespace Illuminate/Validation;use Illuminate/Contracts/Validation/ValidationException;use Illuminate/Contracts/Validation/UnauthorizedException;/** * Provides default implementation of ValidatesWhenResolved contract. */trait ValidatesWhenResolvedTrait{  /**   * Validate the class instance.   *   * @return void   */  public function validate() // 这里实现了`validate`方法  {    $instance = $this->getValidatorInstance(); // 这里获取了`Validator`实例    if (! $this->passesAuthorization()) {      $this->failedAuthorization(); // 这是调用了访问授权的失败处理    } elseif (! $instance->passes()) {      $this->failedValidation($instance); // 这里调用了验证失败的处理，我们主要看这里    }  }  // ...

<?php// ...  /**   * Handle a failed validation attempt.   *   * @param /Illuminate/Contracts/Validation/Validator $validator   * @return mixed   */  protected function failedValidation(Validator $validator)  {    throw new HttpResponseException($this->response( // 这里抛出了传说中的异常      $this->formatErrors($validator)    ));  }

<?php  // ...  /**   * Run the route action and return the response.   *   * @param /Illuminate/Http/Request $request   * @return mixed   */  public function run(Request $request)  {    $this->container = $this->container ?: new Container;    try {      if (! is_string($this->action['uses'])) {        return $this->runCallable($request);      }      if ($this->customDispatcherIsBound()) {        return $this->runWithCustomDispatcher($request);      }      return $this->runController($request);    } catch (HttpResponseException $e) { // 就是这里      return $e->getResponse(); // 这里直接返回了Response给客户端    }  }  // ...

<?php// ...  // 132行：  if ($this->ajax() || $this->wantsJson()) { // 对AJAX请求的处理    return new JsonResponse($errors, 422);  }  return $this->redirector->to($this->getRedirectUrl()) // 对普通表单提交的处理                  ->withInput($this->except($this->dontFlash))                  ->withErrors($errors, $this->errorBag);// ...