Symfony 2 Service "app.locale_listener" must implement interface. but it is implemented

Question

I am using Symfony2 and i wanted to add multilanguage support to my site. I have the bundle symfony/symfony. However, when i do as the documentation says for the setting of the locale variable. I get the following error. my class looks like

<?php
// src/AppBundle/EventListener/LocaleListener.php
namespace AppBundle\EventListener;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
class LocaleListener implements EventSubscriberInterface
{
private $defaultLocale;

public function __construct($defaultLocale = 'en')
{
    $this->defaultLocale = $defaultLocale;
}

public function onKernelRequest(GetResponseEvent $event)
{
    $request = $event->getRequest();
    if (!$request->hasPreviousSession()) {
        return;
    }

    if ($locale = $request->attributes->get('_locale')) {
        $request->getSession()->set('_locale', $locale);
    } else {
        $request->setLocale($request->getSession()->get('_locale', $this->defaultLocale));
    }
}

static public function getSubscribedEvents()
{
    return array(
        // must be registered before the default Locale listener
        KernelEvents::REQUEST => array(array('onKernelRequest', 17)),
    );
}
}

and the service.yml

 app.locale_listener:
        class: AppBundle\EventListener\LocaleListener
        arguments: ['%kernel.default_locale%']
        tags:
            - { name: kernel.event_subscriber }`

if any of you have a suggestion as to how to solve this, i'd be glad to hear it.

EDIT: I now fixed the problem, I noticed after a while that the class already existed somewhere else in the vendor folder. That class worked and looked identical to mine. So I inserted my code and that solved it.

score 0 · Answer 1 · answered Jul 01 '16 at 11:44

You don't have to user a listener to use multi-language. You have translations, you can set the locale variable on the routing. And set a default value.

Example in my app/config/routing.yml:

blog_bundle:
    resource: "@BlogBundle/Resources/config/routing.yml"
    prefix:   /{_locale}/blog
    requirements:
        _locale: fr|en|it|es
    defaults: { _locale: fr}

Joe · Answer 2 · 2016-07-01T14:13:09.367

It looks like the Method Signature of your getSubscribedEvents isn't identical to the interface declaration.

Try switching static public function getSubscribedEvents() to public static function getSubscribedEvents()

public static function getSubscribedEvents()
{
    return array(
        // must be registered before the default Locale listener
        KernelEvents::REQUEST => array(array('onKernelRequest', 17)),
    );
}

Edit in regard to Stans answer: If it is ok for you to always carry the local in all of your routes that is the correct way. Just add _locale to the route and symfony will automatically set it in the request. If you don't want it in your routes and set it based of a cookie value or something like your current TLD the Subscriber Method is the correct one.

Thanks for the comment, I didn't see that I had them switched. And I do not want to have the _locale in my route. So like you said, I'll have to use this method. I have now tried to switch the static and public, but it didn't matter. I still get the same error. — gemina, Jul 04 '16 at 08:16

Symfony 2 Service "app.locale_listener" must implement interface. but it is implemented

2 Answers2