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Add example about FlashBagAwareSessionInterface #16936

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5 changes: 4 additions & 1 deletion security/access_denied_handler.rst
Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,10 @@ unauthenticated user tries to access a protected resource::
public function start(Request $request, AuthenticationException $authException = null): RedirectResponse
{
// add a custom flash message and redirect to the login page
$request->getSession()->getFlashBag()->add('note', 'You have to login in order to access this page.');
$session = $request->getSession();
if ($session instanceof FlashBagAwareSessionInterface) {
$session->getFlashBag()->add('note', 'You have to login in order to access this page.');
}

return new RedirectResponse($this->urlGenerator->generate('security_login'));
}
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5 changes: 5 additions & 0 deletions session.rst
Original file line number Diff line number Diff line change
Expand Up @@ -163,6 +163,11 @@ if you type-hint an argument with :class:`Symfony\\Component\\HttpFoundation\\Re
// the second argument is the value returned when the attribute doesn't exist
$filters = $session->get('filters', []);

// when the session is flashBag aware, you can add a flash message
if ($session instanceof FlashBagAwareSessionInterface) {
$session->getFlashBag()->add('note', 'This is a flash message.');
}

// ...
}
}
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