Pass path parameters automatically - symfony

Question

I'm building a site where the user can choose a country, state and city he wants.
Once he selects these parameters he goes to a page like this: en.example.com/spain/madrid/madrid/
The problem is, every time I want to build a new url, I must pass these 3 variables and I was wondering if I could do something to make them just like the _locale variable which symfony itself passes it to the parameters.
Thanks

Answer 1

After searching more I found this post: http://blog.viison.com/post/15619033835/symfony2-twig-extension-switch-locale-current-route
I just used the idea and made the changes I needed and this is the final code for my extension
<?php
namespace Comehoy\CoreBundle\Twig\Extension;
use Symfony\Bundle\FrameworkBundle\Routing\Router;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\HttpKernel;
class PathExtension extends \Twig_Extension
{
private $request;
private $router;
public function __construct(Router $router) {
$this->router = $router;
}
public function onKernelRequest(GetResponseEvent $event) {
if ($event->getRequestType() === HttpKernel::MASTER_REQUEST) {
$this->request = $event->getRequest();
}
}
public function getFunctions()
{
return array(
'l10n_path' => new \Twig_Function_Method($this, 'getPath')
);
}
public function getPath($name, $parameters = array())
{
$parameters = array_merge($parameters, [
'country' => $this->request->get('country'),
'state' => $this->request->get('state'),
'city' => $this->request->get('city'),
]);
return $this->generator->generate($name, $parameters, false);
}
public function getName()
{
return 'twig_my_path_extension';
}
}
And as for the configuration its the same as the post
services:
twig.localized_route_extension:
class: Acme\CoreBundle\Twig\PathExtension
tags:
- { name: twig.extension }
- { name: kernel.event_listener, event: kernel.request, method: onKernelRequest }
arguments: [#router]
And for the routes that I use country, state and the city I put them in the prefix to avoid repeating them in each route.
acme_core:
resource: "#AcmeCoreBundle/Controller/"
type: annotation
prefix: /{country}/{state}/{city}
Hope it helps someone else.