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();
    }
  }

<?php

namespace apphttprequests;

use apphttprequestsrequest; // 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(apphttprequestsstorecommentrequest $request)
  {
    // ...
  }

// ...

<?php

namespace illuminatevalidation;

use illuminatesupportserviceprovider;
use illuminatecontractsvalidationvalidateswhenresolved;

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 illuminatefoundationhttp;

use illuminatehttprequest;
use illuminatehttpresponse;
use illuminatehttpjsonresponse;
use illuminateroutingredirector;
use illuminatecontainercontainer;
use illuminatecontractsvalidationvalidator;
use illuminatehttpexceptionhttpresponseexception;
use illuminatevalidationvalidateswhenresolvedtrait;
use illuminatecontractsvalidationvalidateswhenresolved; // 是你
use illuminatecontractsvalidationfactory as validationfactory;

// 我们`apphttprequestsrequest`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

  // ...

<?php

namespace illuminatevalidation;

use illuminatecontractsvalidationvalidationexception;
use illuminatecontractsvalidationunauthorizedexception;

/**
 * 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 illuminatecontractsvalidationvalidator $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 illuminatehttprequest $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);

// ...