Making the Locale "Sticky" during a User's Session
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Making the Locale "Sticky" during a User's Session
Prior to Symfony 2.1, the locale was stored in a session attribute called _locale.
Since 2.1, it is stored in the Request, which means that it's not "sticky"
during a user's request. In this article, you'll learn how to make the locale
of a user "sticky" so that once it's set, that same locale will be used for
every subsequent request.
Creating a LocaleListener
To simulate that the locale is stored in a session, you need to create and
register a new event listener.
The listener will look something like this. Typically, _locale is used
as a routing parameter to signify the locale, though it doesn't really matter
how you determine the desired locale from the request:
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// src/Acme/LocaleBundle/EventListener/LocaleListener.php
namespace Acme\LocaleBundle\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;
}
// try to see if the locale has been set as a _locale routing parameter
if ($locale = $request->attributes->get('_locale')) {
$request->getSession()->set('_locale', $locale);
} else {
// if no explicit locale has been set on this request, use one from the session
$request->setLocale($request->getSession()->get('_locale', $this->defaultLocale));
}
}
public static function getSubscribedEvents()
{
return array(
// must be registered before the default Locale listener
KernelEvents::REQUEST => array(array('onKernelRequest', 17)),
);
}
}Then register the listener:
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services:
acme_locale.locale_listener:
class: Acme\LocaleBundle\EventListener\LocaleListener
arguments: ["%kernel.default_locale%"]
tags:
- { name: kernel.event_subscriber }That's it! Now celebrate by changing the user's locale and seeing that it's sticky throughout the request. Remember, to get the user's locale, always use the Request::getLocale method:
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// from a controller...
use Symfony\Component\HttpFoundation\Request;
public function indexAction(Request $request)
{
$locale = $request->getLocale();
}
