Symfony 5 - refresh user session without relogging - symfony

Question

Is there any way to refresh User session? I have my controller with change locale form, once it submitted i want to refresh that session with new set locale. I already tried to use session migrate() ,but unsuccessfully.
Any ideas?
Part of my controller
/**
* #route("/changeLocale", name="changeLocale")
*/
public function changeLocale(Request $request, Session $session)
{
$form = $this->createFormBuilder(null)
->add('locale', ChoiceType::class, [
'choices' => [
'Français' => 'fr_FR',
'Czech' => 'cs_CZ',
'English(US)' => 'en_US'
]
])
->add('save', SubmitType::class)
->getForm()
;
$form->handleRequest($request);
if ($form->isSubmitted()) {
$em = $this->getDoctrine()->getManager();
$locale = $form->getData()['locale'];
$user = $this->getUser();
$user->setLocale($locale);
$em->persist($user);
$em->flush();
$session->migrate();
}
return $this->render('admin/dashboard/locale.html.twig', [
'form' => $form->createView()
]);
}

Answer 1

That's the wrong way.
When you authenticate, you save the locale of your user entity in the session. Right? If you have a LocaleSubscriber that saves the locale in your session, recreating your session won't work. The locale is only saved in the session at authentication.
If you change the locale, you just need to update the session.
if ($form->isSubmitted()) {
$em = $this->getDoctrine()->getManager();
$locale = $form->getData()['locale'];
$user = $this->getUser();
$user->setLocale($locale);
$em->persist($user);
$em->flush();
// Update the session
$request->getSession()->set('_locale', $locale);
}