Set FOSRestBundle Exception _format

Question

I am using FOSRestBundle in my Symfony 2.3 project.

I am not able to set _format for response exceptions. In my config.yml I have:

twig:
    exception_controller: 'FOS\RestBundle\Controller\ExceptionController::showAction'

Default return is HTML format, but is it possible to set _format = json to return exceptions?

I have more than one bundle, but only one is RestBundle, so other bundles need to set in normal way.

Answer 1

You can write your routes manually and set _format there like this:

acme_demo.api.user:
    type: rest
    pattern: /user/{username_canonical}.{_format}
    defaults: { _controller: 'AcmeDemoBundle:User:getUser', username_canonical: null, _format: json }
    requirements:
        _method: GET

Edit: Or you can write your own exception handler and do with exceptions whatever you need to do:

// src/Acme/DemoBundle/EventListener/AcmeExceptionListener.php
namespace Acme\DemoBundle\EventListener;

use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;

class AcmeExceptionListener
{
    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        // do whatever tests you need - in this example I filter by path prefix
        $path = $event->getRequest()->getRequestUri();
        if (strpos($path, '/api/') === 0) {
            return;
        }

        $exception = $event->getException();
        $response = new JsonResponse($exception, 500);

        // HttpExceptionInterface is a special type of exception that
        // holds status code and header details
        if ($exception instanceof HttpExceptionInterface) {
            $response->setStatusCode($exception->getStatusCode());
            $response->headers->replace($exception->getHeaders());
        }

        // Send the modified response object to the event
        $event->setResponse($response);
    }
}

And register it as a listener:

# app/config/config.yml
services:
    kernel.listener.your_listener_name:
        class: Acme\DemoBundle\EventListener\AcmeExceptionListener
        tags:
            - { name: kernel.event_listener, event: kernel.exception, method: onKernelException }

How to create an Event Listener