zend-framework2 - 手动触发 404 错误

Question

我一直在努力手动触发 dispatch.error来自另一个 Controller 监听器。
目标是在路由参数无效的情况下引发 404 错误并使其被标准 Zend\Mvc\View\Http\RouteNotFoundStrategy“捕获”。所以404页面被渲染。

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，调试它们给了我:

CALLED Zend\Mvc\View\Http\RouteNotFoundStrategy::detectNotFoundError (The error is : error-controller-not-found)

CALLED Zend\Mvc\View\Http\RouteNotFoundStrategy::prepareNotFoundViewModelCALLED Zend\Mvc\View\Http\RouteNotFoundStrategy::injectNotFoundReason

但是，在给我一个 404 之后返回响应没有 body 。

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

如果我不返回响应，调度会继续，我会收到 500错误

RuntimeException 'foo not set'

如何手动触发 404 错误并正确呈现 404 模板？

Answer 1

我认为你不能，也不应该。当你在 Controller 中时，路由器已经完成了它的工作，所以回到 Zend\Mvc\View\Http\RouteNotFoundStrategy不管用。

你应该做的就是把路由中需要的参数设置好，路由器会帮你做检查。

如果您已经考虑过这一点，但仍想对请求处理错误使用 404 响应，请查看实际的 DispatchListener 如何处理它:

$event->setError($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();
}