How to store user's locale in database. FOSUserBundle, Symfony2.0.9

10.parameters.ini

# symfony2/app/config/parameters.ini
locale="undefined"
fallback_locale="en"

11.config.yml

framework:
    ...
    translator:      { fallback: %fallback_locale% }
    session:
        default_locale: %locale%

20.User.php

<?php
// symfony2/src/Application/Sonata/UserBundle/Entity/User.php

class User extends BaseUser
{
//...
    /**
     * @ORM\Column(name="locale", type="string", length=5, nullable="true")
     *
     */
    protected $locale;

    public function getLocale()
    {
        return $this->locale;
    }

    /**
     * @param string $locale
     */
    public function setLocale($locale)
    {
        $this->locale = $locale;
    }
}

30.services.yml

# symfony2/src/Application/Sonata/UserBundle/Resources/config/services.yml
services:
    application_sonata_user.security.interactive_login_listener:
        class: Application\Sonata\UserBundle\EventListener\UserListener
        tags:
            - { name: kernel.event_listener, event: security.interactive_login, method: setLocaleForAuthenticatedUser }

    application_sonata_user.security.kernel_request_listener:
        class: Application\Sonata\UserBundle\EventListener\UserListener
        tags:
            - { name: kernel.event_listener, event: kernel.request, method: setLocaleForUnauthenticatedUser }

40.UserListener.php

<?php
// symfony2/src/Application/Sonata/UserBundle/EventListener/UserListener.php

namespace Application\Sonata\UserBundle\EventListener;
use Symfony\Component\Security\Http\Event\InteractiveLoginEvent,
    Symfony\Component\HttpKernel\Event\GetResponseEvent,
    Symfony\Component\HttpKernel\HttpKernelInterface;


class UserListener
{
    /**
     * kernel.request event. If a guest user doesn't have an opened session, locale is equal to
     * "undefined" as configured by default in parameters.ini. If so, set as a locale the user's
     * preferred language.
     *
     * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
     */
    public function setLocaleForUnauthenticatedUser(GetResponseEvent $event)
    {
        if (HttpKernelInterface::MASTER_REQUEST !== $event->getRequestType()) {
            return;
        }
        $request = $event->getRequest();
        if ('undefined' == $request->getLocale()) {
            $request->setLocale($request->getPreferredLanguage());
        }
    }

    /**
     * security.interactive_login event. If a user chose a locale in preferences, it would be set,
     * if not, a locale that was set by setLocaleForUnauthenticatedUser remains.
     *
     * @param \Symfony\Component\Security\Http\Event\InteractiveLoginEvent $event
     */
    public function setLocaleForAuthenticatedUser(InteractiveLoginEvent $event)
    {
        /** @var \Application\Sonata\UserBundle\Entity\User $user  */
        $user = $event->getAuthenticationToken()->getUser();

        if ($user->getLocale()) {
            $event->getRequest()->setLocale($user->getLocale());
        }
    }
}