symfony2 redirect in constructor

Question

I want to do a redirect in the constructor in a specific sutiation. I tried to do it like this:

return new \\Symfony\\Component\\HttpFoundation\\RedirectResponse         


        

Answer 1

Bad idea to redirect from controller directly. I would rather throw some custom exception.

class FooController{
    public function __construct(){
        if ( some_test ){
            throw RedirectionException(); // name it however you like
        }
    }
}

Then, in Symfony, setup the ExceptionListener which will evaluate class-type of Exception thrown and redirect you application to another URL, if necessary. This service will most likely depend on @routing service to generate alternate URL destination.

Service config:

services:
    kernel.listener.your_listener_name:
        class: Your\Namespace\AcmeExceptionListener
        tags:
            - { name: kernel.event_listener, event: kernel.exception, method: onKernelException }

Listener class:

class AcmeExceptionListener
{
    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        // You get the exception object from the received event
        $exception = $event->getException();

        if ( $exception instanceof RedirectionException ){
            $response = new RedirectResponse();

            $event->setResponse($response);
        }
    }
}

This way to can maintain single error handling and redirection logic. Too complicated?