Change CSRF token after Submission and Validation Form

Question

How change csrf token in Symfony2/3 when form was submitted, validated and saved form's data to server?

// AppController.php
...
public function saveAction(Request $request) {
    $event = new Data();
    $form = $this->createForm(DataForm::class, $event);
    $form->handleRequest($request);
    if ($form->isSubmitted() && $form->isValid()) {
        $creator = $this->getDoctrine()
            ->getRepository('AppBundle:User')
            ->find($this->getUser()->getId());
        $event->setCreator($creator);
        $entityManager = $this->getDoctrine()->getManager();
        $entityManager->persist($event);
        $entityManager->flush();

< SOMETHING HERE to change csrf token. ANY IDEAS? >

        return $this->redirect($this->generateUrl('event_view', ['id' => $event->getId()]));
    }
    $message = ['text' => 'Wrong data to save', 'type' => 'danger'];
    $this->get('session')->set('messages', [$message]);
    return $this->redirect($this->generateUrl('event_create'));
}
...

Answer 1

It should be regenerating the CSRF token automatically. The only reason I could think that you may want to do this would be if you submit the form with ajax and for whatever reason needed to get the next token: In your form type:

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        //...other defaults
        'intention'       => 'data_form_intention',
    ));
}

In your saveAction:

$csrf = $this->get('security.csrf.token_manager');     
$token = $csrf->refreshToken("data_form_intention");