How to generate an URL for a controller in Symfony? - symfony

Question

I know how to generate an URL for a route. However now I need to generate an URL for a controller or for a controller with a method. I checked the sourced of UrlGenerator but did not find any relevant information. No information in Symfony docs as well.
The method of the controller has an associate url. This url will be used in controller but I need the generator to be a service.

Answer 1

Basically you need to:
1. Add a route to the controller
<?php
declare(strict_types=1);
namespace App\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
final class BlogController extends AbstractController
{
/**
* #Route(path="blog", name="blog")
*/
public function __invoke(): Response
{
return $this->render('blog/blog.twig');
}
}
2. Generate url route for a route
See Symfony docs
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
class SomeService
{
/**
* #var UrlGeneratorInterface
*/
private $urlGenerator;
public function __construct(UrlGeneratorInterface $urlGenerator)
{
$this->urlGenerator = $urlGenerator;
}
public function go()
{
// ...
// generate a URL with no route arguments
$signUpPage = $this->urlGenerator->generateUrl('sign_up');
// generate a URL with route arguments
$userProfilePage = $this->urlGenerator->generateUrl('user_profile', [
'username' => $user->getUsername(),
]);
// generated URLs are "absolute paths" by default. Pass a third optional
// argument to generate different URLs (e.g. an "absolute URL")
$signUpPage = $this->urlGenerator->generateUrl('sign_up', [], UrlGeneratorInterface::ABSOLUTE_URL);
// when a route is localized, Symfony uses by default the current request locale
// pass a different '_locale' value if you want to set the locale explicitly
$signUpPageInDutch = $this->urlGenerator->generateUrl('sign_up', ['_locale' => 'nl']);
}
}

Answer 2

So, here is the service. At least an example of how it could implemented. SF4
namespace App\Route;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\RouterInterface;
class UrlGenerator
{
/**
* #var RouteCollection
*/
private $collection;
public function __construct(RouterInterface $router)
{
$this->collection = $router->getRouteCollection();
}
public function generate(string $controllerClass, string $method): string
{
foreach ($this->collection as $item) {
$defaults = $item->getDefaults();
$controllerPath = $defaults['_controller'];
$parts = explode('::', $controllerPath);
if ($parts[0] !== $controllerClass) {
continue;
}
if ($parts[1] !== $method) {
continue;
}
return $item->getPath();
}
throw new \RuntimeException(
'Route for such combination of controller and method is absent'
);
}
}
Poorly tested but working solution.