What you need to do is not too difficult. Symfony lets you explicitly specify which controller handles your exceptions. So in your config.yml you can specify an exception controller in your branch setup:
since symfony 2.2
twig: exception_controller: my.twig.controller.exception:showAction services: my.twig.controller.exception: class: AcmeDemoBundle\Controller\ExceptionController arguments: [@twig, %kernel.debug%]
before Symfony 2.1:
twig: exception_controller: AcmeDemoBundle\Controller\ExceptionController::showAction
Then you can create a custom showAction that displays a custom error page based on the route:
<?php namespace AcmeDemoBundle\Controller; use Symfony\Component\HttpKernel\Exception\FlattenException; use Symfony\Component\HttpKernel\Log\DebugLoggerInterface; use Symfony\Component\HttpFoundation\Response; use Symfony\Bundle\TwigBundle\Controller\ExceptionController as BaseExceptionController; class ExceptionController extends BaseExceptionController { public function showAction(FlattenException $exception, DebugLoggerInterface $logger = null, $format = 'html') { if ($this->container->get('request')->get('_route') == "abcRoute") { $appTemplate = "backend"; } else { $appTemplate = "frontend"; } $template = $this->container->get('kernel')->isDebug() ? 'exception' : 'error'; $code = $exception->getStatusCode(); return $this->container->get('templating')->renderResponse( 'AcmeDemoBundle:Exception:' . $appTemplate . '_' . $template . '.html.twig', array( 'status_code' => $code, 'status_text' => Response::$statusTexts[$code], 'exception' => $exception, 'logger' => null, 'currentContent' => '', ) ); } }
Obviously, you should probably set up an if statement where it checks the current route according to your needs, but that should do it.
You might want to add code that defaults to regular Twig error pages if you do not have a specific error template. For more information, check out the code in
Symfony\Bundle\TwigBundle\Controller\ExceptionController
and
Symfony\Component\HttpKernel\EventListener\ExceptionListener