Symfony2: Redirecting to last route and flash a message?

In Symfony2, you can redirect to the last route using the redirect function and passing in the referer option:

return $this->redirect($this->generateUrl('your_route'), 301, array(), true);

To flash a message, you can use the session service to set a flash message:

$this->get('session')->getFlashBag()->add('notice', 'Your message here');

You can then retrieve the flash message in your template using the flashes function:

{% for message in app.session.flashbag.get('notice') %}
    <div class="flash-notice">
        {{ message }}
    </div>
{% endfor %}

You can also use flash() helper function from Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface

$this->addFlash('notice', 'Your message here');

You can then retrieve the flash message in your template using the flashes function as above.