Maintain locale after login in Symfony2

Question

On a multilingual website using Symfony, I've got a page with a login form embedded in the sidebar. Let's say I'm on the spanish version, the current url is mysite.com/es. On this page, $request->getLocale() gives me 'es', everything is fine.

However, if I submit the login form on this page, I get to mysite.com. The 'es' part in the url has disappeared and $request->getLocale() gives me 'en'. How can I make it so that my url and my locale don't change?

My form:

<form id="login-form" method="POST" action="/login-check">
    <input type="text" id="userEmail" name="_username">
    <input type="password" id="userPassword" name="_password">
    <input type="hidden" name="_csrf_token" value="{{ fos_csrf_provider.generateCsrfToken('authenticate') }}">
</form>

My firewall:

main:
    pattern: ^/
    form_login:
        provider: fos_userbundle
        csrf_provider: form.csrf_provider
        login_path: / 
        check_path: /login_check
    logout:
        path: my_site_logout
        target: /
        success_handler: my_site.logout_success_handler
    anonymous:    true
    remember_me:
        key:        %secret%

Answer 1

You are looking for the following: http://symfony.com/doc/current/cookbook/session/locale_sticky_session.html

Sticky locale. I used this in one of my projects.