Silex Route Helpers

app_bootstrap.php

<?php

use Silex\Application;
use Demo\Entity\Post;
use Demo\Controller\PostController;

$app = new Application;
$app['route_class'] = 'CustomRoute';
$app['dispatcher']->addSubscriber(new TemplateRenderingListener($app));

/**
 * Todo:
 *     * Custom Controller Resolver as per http://davedevelopment.co.uk/2012/10/03/Silex-Controllers-As-Services.html
 *     * Setup Twig
 *     * Setup Doctrine ORM
 */

$app['findOr404Factory'] = $app->protect(function($type, $message = null) use ($app) {

    if (null === $message) {
        $lastNamespace = strrpos($type, "\\");

        if ($lastNamespace !== false) {
            $message = substr($type, strrpos($type, "\\") + 1) . " Not Found";
        } else {
            $message = "$type Not Found";
        }
    }

    return function($id) use ($app, $type, $message) {

        $obj = $app['em']->getRepository($type)->find($id);

        if (null === $obj) {
            return $app->abort(404, $message);
        }

        return $obj;
    };
});

/**
 * Routes
 */
$app->get("/posts/{post}", "posts.controller:viewAction")
    ->convert("post", $app['findOr404Factory']("Demo\Entity\Post"))
    ->template("post/edit.html.twig");

src_Demo_Controller_PostController.php

<?php

namespace Demo\Controller;

use Demo\Entity\User;


class PostController
{
    public function viewAction(Post $post)
    {
        /** Do something clever */
        return array("post" => $post);
    }
}

src_Demo_CustomRoute.php

<?php

namespace Demo;

use Silex\Route;

class CustomRoute extends Route
{
    public function template($path)
    {
        $this->setOption('_template', $path);
        return $this;
    }
}

src_Demo_EventListener_TemplateRenderingListener.php

<?php

namespace Demo\EventListener;

use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Response;

class TemplateRenderingListener implements EventSubscriberInterface
{
    protected $app;

    public function __construct(Application $app)
    {
        $this->app = $app;
    }

    public function onKernelView(GetResponseForControllerResultEvent $event)
    {
        $response = $event->getControllerResult();
        if (!is_array($response)) {
            return;
        }

        $request = $event->getRequest();
        $routeName = $request->attributes->get('_route');
        if (!$route = $this->app['routes']->get($routeName)) {
            return;
        }

        if (!$template = $route->getOption('_template')) {
            return;
        }

        $output = $this->app['twig']->render($template, $response);
        $event->setResponse(new Response($output));
    }

    public static function getSubscribedEvents()
    {
        return array(
            KernelEvents::VIEW => array('onKernelView', -10),
        );
    }
}