Symfony2 - how to clear / edit a flash message

Question

I am setting a flash message in my controller when rendering a twig template. If there is a post action, I would like to redirect to the same page, but change the flash message.

if ($request->isMethod('POST')) {
    ...
    ...

    $this->get('session')->getFlashBag()->clear(); // Does not work
    $this->get('session')->getFlashBag()->all();   // Does not work

    $request->getSession()->getFlashBag()->set('user-notice', $flash_message2);

    return $this->redirect($request->headers->get('referer'));
}


$this->get('session')->getFlashBag()->set('user-notice', $flash_message1);

return $this->render(....

But the problem is that the displayed flash messages is the $flash_message1, and should be $flash_message2.

When trying to use add instead of set, I can see them both. I tryied to use the Symfony2 clear() and all() functions: http://api.symfony.com/2.3/Symfony/Component/HttpFoundation/Session/Flash/FlashBagInterface.html but nothing changed.

Any idea? Thank you !!!

Ormandy

could you please include the method's relevant code completely and maybe add how your attempt with clear() and set() looked? – Brooke

problem is that the displayed flash messages is the 1st one. ... what message gets returned if you send a POST request? ... $flash_message or $flash_message 2 ? – Brooke

When using the post, flashMessage2 needs to be displayed, but instead of this one, the flashMessage1 is displayed. – Ormandy

Answer 1

Use...

$flashBag = $this->get('session')->getFlashBag();
$flashBag->get('user-notice'); // gets message and clears type
$flashBag->set('user-notice', $flash_message2);

... after your isPost() condition.

Freespoken

Ahhh, I know what's the problem. When I am using redirect, I am redirecting to the same page, so even if I set the flashMessage2, an the end the flashMessage1 will be set because I am redirecting to the same page. Any idea on how to fix that ? – Ormandy

Thanks, but this did not fixed teh problem. The $flashBag->has('user-notice') is allwaays false. – Ormandy

have you cleared your cache and your browser cache ? Updated my answer - just use get() to clear the message. It has to be unset afterwards ... see FlashBag Line 97. – Brooke

Yes, both caches are cleared. About your new answer, the problem is how to know if I have to set the 1st or 2nd message. In both cases, I am comming from an redirect, so not from post. Should I use a simple render instead of redirect ? – Ormandy

Answer 2

To clear all flash messages use the following code:

$this->get('session')->getFlashBag()->clear();

Papistry

Why was this downvoted ? An explanation would help people like me, reading this, understand what's going on. – Heavyarmed

Upvoted, there's absolutely no reason this should be downvoted. The only thing to note is that this clears the ENTIRE flashbag and not a specific one like 'user-notice'. – Portly

Answer 3

One easy way to delete all flash messages is as follows:

// clear all messages from FlashBag
$flashBag = $this->get('session')->getFlashBag();
foreach ($flashBag->keys() as $type) {
    $flashBag->set($type, array());
}

This works just fine in Symfony 2.4, and probably all other recent versions.

Itemize

That is not easy! The easy way is this: $this->get('session')->getFlashBag()->clear(); – Strow

@Trix There used to be an issue with exactly what you suggested two years ago. Have another look at the question: Milos is asking what to do when it does not work that way. – Itemize