手动触发404错误

Question

我一直在努力从另一个控制器监听器中手动触发dispatch.error。

目标是提出一个404错误，其中路由参数无效，并使其被标准Zend\Mvc\View\Http\RouteNotFoundStrategy“抓住”，以便呈现404页面。

public function FooController extends AbstractActionController 
{ 
    protected $foo; 

    public function getEventManager() 
    { 
     $em = parent::getEventManager(); 

     // Attach with higher priority than dispatched indexAction 
     $em->attach('dispatch', array($this, 'getFooFromRouteParam'), 10); 
    } 

    public function indexAction() 
    { 
     $foo = $this->getFoo(); // Error 500 (not 400) 
    } 

    public function getFooFromRouteParam(EventInterface $event) 
    { 
     $id = $this->params('id', false); 

     if (! empty($id)) { 

      $foo = $this->aDatabaseService->loadFromTheDatabase($id); 

      if ($foo instanceof Foo) { 

       $this->setFoo($foo); 
       return; 
      } 
     } 

     $response = $event->getResponse(); 

     $response->setStatusCode(404); 
     $event->setError(\Zend\Mvc\Application::ERROR_ROUTER_NO_MATCH); 

     $event->getApplication() 
       ->getEventManager() 
       ->trigger('dispatch.error', $event); 

     //return $response; 
    } 

    public function getObjectFoo() 
    { 
     if (null == $this->foo) { 
      throw new \RuntimeException('foo not set'); 
     } 
     return $this->foo; 
    } 

    public fucntion setObjectFoo(Foo $object) 
    { 
     $this->foo = $object; 
    } 
} 

事件被正确触发，调试他们给了我：

CALLEDZend\Mvc\View\Http\RouteNotFoundStrategy::detectNotFoundError（错误是：error-controller-not-found）

CALLEDZend\Mvc\View\Http\RouteNotFoundStrategy::prepareNotFoundViewModel CALLEDZend\Mvc\View\Http\RouteNotFoundStrategy::injectNotFoundReason

但是，返回后的回应给我一个404没有身体。

return $response; // ends execution with 404 but no body, just white screen. 

如果我不回调度继续响应，我得到一个500错误

RuntimeException的“富不设置”

我如何可以手动触发一个404错误，正确渲染404模板？

Answer 1

终于成功地找出问题。

Zend\Mvc\Controller\AbstractController方法预计将返回一个Response它将停止执行控制器的事件。

这是dispatch方法的相关部分。

$result = $this->getEventManager()->trigger(MvcEvent::EVENT_DISPATCH, $e, 
    function ($test) { 
     return ($test instanceof Response); 
    } 
); 

if ($result->stopped()) { 
    return $result->last(); 
} 

return $e->getResult(); 

我需要什么做的是回到我的结果（这是错误的视图模型）和手动停止事件传播（以确保剩余的控制器操作未执行）

// Set the event's 'error' vars 
$event->setError(Application::ERROR_EXCEPTION); 
$event->setParam('exception', new \Exception('A custom error message here')); 

// Trigger the dispatch.error event 
$event->getApplication() 
     ->getEventManager() 
     ->trigger(MvcEvent::EVENT_DISPATCH_ERROR, $event); 

// The missing piece! Required to ensure the remaining dispatch 
// listeners are not triggered 
$event->stopPropagation(true); 

// Contains the view model that was set via the ExceptionStrategy 
return $event->getResult(); 

Answer 2

我不认为你可以，也不应该。当你在控制器中时，路由器已经完成了它的工作，所以回到Zend\Mvc\View\Http\RouteNotFoundStrategy将不起作用。

你应该做的是使路由中所需的参数，所以路由器会为你做检查。

如果您已经考虑过这个，但是仍然要使用请求处理错误404响应，看看实际DispatchListener如何处理这个吧：

$event->setError($application::ERROR_EXCEPTION) 
     ->setController($controllerName) 
     ->setParam('exception', $exception); 

$events = $application->getEventManager(); 
$results = $events->trigger(MvcEvent::EVENT_DISPATCH_ERROR, $event); 
$return = $results->last(); 
if (! $return) { 
    $return = $event->getResult(); 
} 

Answer 3

对于Zend框架3

TRIGER 404 manuely在控制器并把它在错误监听：

public function articleAction() 
{ 
    // For eg. if we can not found article fetched by url_slug 
    if(!$article){ 
     $this->getResponse()->setStatusCode(404); 
     $this->getEvent()->setName(MvcEvent::EVENT_DISPATCH_ERROR); 
     $this->getEvent()->getApplication()->getEventManager()->triggerEvent($this->getEvent()); 

     return false; 
    } 

    return ['article' => $article]; 
}