Symfony Custom Error Page By Overriding ExceptionController - symfony

Question

what I am trying to do is to have custom error page, not only will they be extending the base layout but also I want extra up selling content in those pages too so changing templates only is not an option
regardless of the reason (404 Not Found or just missing variable) I would like to show my template and my content instead
I have spent hours trying to get this going with no luck
app/console --version
Symfony version 2.5.6 - app/dev/debug
I tried some resources, but couldn't get it working. The name a few:
http://symfony.com/doc/current/reference/configuration/twig.html
http://symfony.com/doc/current/cookbook/controller/error_pages.html
I'm running in dev with no debug, see app_dev.php below:
$kernel = new AppKernel('dev', false);
following the tutorials i got these extra bits
app/config/config.yml
twig:
exception_controller: SomethingAppBundle:Exception:show
in my bundle
<?php
namespace Something\AppBundle\Controller;
use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
use Symfony\Component\HttpKernel\Exception\FlattenException;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
class ExceptionController extends Controller
{
public function showAction( FlattenException $error, DebugLoggerInterface $debug)
{
print_r($error);
}
}
but my error controller does not get executed,
I am on purpose causing error by trying to echo undefined variable in different controller, since it should handle error from entire application

Answer 1

At the beginning you need to create action in the controller:
<?php
namespace AppBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
class ErrorController extends Controller
{
public function notFoundAction()
{
return $this->render('error/404.html.twig');
}
}
Then you need to create a Listener:
<?php
namespace AppBundle\EventListener;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\HttpKernel\HttpKernelInterface;
class NotFoundHttpExceptionListener
{
private $controller_resolver;
private $request_stack;
private $http_kernel;
public function __construct($controller_resolver, $request_stack, $http_kernel)
{
$this->controller_resolver = $controller_resolver;
$this->request_stack = $request_stack;
$this->http_kernel = $http_kernel;
}
public function onKernelException(GetResponseForExceptionEvent $event)
{
if ($event->getException() instanceof NotFoundHttpException) {
$request = new \Symfony\Component\HttpFoundation\Request();
$request->attributes->set('_controller', 'AppBundle:Error:notFound');
$controller = $this->controller_resolver->getController($request);
$path['_controller'] = $controller;
$subRequest = $this->request_stack->getCurrentRequest()->duplicate(array(), null, $path);
$event->setResponse($this->http_kernel->handle($subRequest, HttpKernelInterface::MASTER_REQUEST)); // Simulating "forward" in order to preserve the "Not Found URL"
}
}
}
Now register the service:
#AppBundle/Resources/config/services.yml
services:
kernel.listener.notFoundHttpException:
class: AppBundle\EventListener\NotFoundHttpExceptionListener
tags:
- { name: kernel.event_listener, event: kernel.exception, method: onKernelException, priority: -10 }
arguments: [ #controller_resolver, #request_stack, #http_kernel ]
Not tested this, but rather it should work;)
EDIT:
Tested, it works. On the rendered page, you have a session, so you have access to app.user, his cart, and other matters related to the session.