Integrating Symfony Routing and Twig using Symfony Twig Bridge - symfony

Question

I use in my code Twig and Symfony routing which I would like to integrate with Twig using Symfony Twig Bridge.
I have them both installed and what I need to do is to add to Twig extensions Symfony\Bridge\Twig\Extension\RoutingExtension which requires Symfony\Component\Routing\Generator\UrlGenerator.
UrlGenerator requires 2 arguments:
routes collection
request context
So in my yaml services file I have:
router:
class: Symfony\Component\Routing\Router
arguments:
- '#yaml.file.loader'
- '%routing.file%'
- { 'cache_dir' : '%cache.dir%' }
- '#request.context'
twig:
class: Twig_Environment
calls:
- ['addExtension', ['#twig.extensions.debug']]
- ['addExtension', ['#twig.extensions.translate']]
- ['addExtension', ['#twig.extensions.routing']]
arguments:
- '#twig.loader'
- '%twig.options%'
twig.extensions.routing:
class: Symfony\Bridge\Twig\Extension\RoutingExtension
public: false
arguments:
- '#twig.url.generator'
And finally UrlGenerator:
twig.url.generator:
class: Symfony\Component\Routing\Generator\UrlGenerator
public: false
arguments:
- '#router'
- '#request.context'
Unfortunatelly #router is not route collection type. It has method getRouteCollection which allows to get data required by UrlGenerator and it works if I add extension manually eg. from controller. But I don't want to split services definition between different files and prefer to keep them in yaml services definition.
So the question is: how to pass as an argument to UrlGenerator not the raw object Router but result of getRouteCollection?

Answer 1

There are multiple ways to do this:
Using Symfony expression language
If you have Symfony Expression Language component installed, you can do this in your service definition:
twig.url.generator:
class: Symfony\Component\Routing\Generator\UrlGenerator
public: false
arguments:
- "#=service('router').getRouteCollection()"
- "#request.context"
Using factory
If for some reason you don't want to use Symfony Expression Language, you can do it using a factory class which is responsible for instantiating your url generator.
class UrlGeneratorFactory
{
private $router;
private $requestContext;
public function __construct($router, $requestContext)
{
$this->router = $router;
$this->requestContext = $requestContext;
}
public function create()
{
return new UrlGenerator($this->router->getRouteCollection(), $this->requestContext);
}
}
And in your yaml set url generator definition to:
twig.url.generator.factory:
class: UrlGeneratorFactory
arguments: ["#router", "#request.context"]
twig.url.generator:
class: Symfony\Component\Routing\Generator\UrlGenerator
factory: ["#twig.url.generator.factory", create]