Symfony2 return value of flush metode - php

Question

Ok i got stuck and no info in documentation about this (correct me if i am wrong)
Example: i have update metod in controller, some form and if forim is valid i use flush method to make changes. How can i check if changes were made in DB so i can send flash message if changes were made "Success" or if query is not executed if there is some error i send flash message "Failed to make changes to DB"
Here is example of my code but i think that flush returns void or null so this is not the way to go, maybe it returns some exceptions on failure i dont know..
/**
* #Route("createpost", name="createpost")
*/
public function createPostAction(Request $request) {
if (!$this->get('security.authorization_checker')->isGranted('ROLE_ADMIN')) {
throw $this->createAccessDeniedException();
}
$post = new Post();
$form = $this->createForm(new PostForm(), $post);
$form->handleRequest($request);
if($form->isValid()) {
$user = $this->getUser();
$author = $user->getUsername();
//$post->setPublishDate(new \DateTime);
$post->setAuthor($author);
$em = $this->getDoctrine()->getManager();
$em->persist($post);
$pom = $em->flush();
return $this->render('success/success.html.twig', array(
'test' => var_dump($pom)
));
if($pom) {
$this->addFlash(
'notice',
'You have successfully created post'
);
}
return $this->redirectToRoute('home', array(), 301);
}
return $this->render(
'create/post.html.twig', array(
'form' => $form->createView()
));
}

Answer 1

You can do it like this:
...
if($form->isValid()) {
$user = $this->getUser();
$author = $user->getUsername();
//$post->setPublishDate(new \DateTime);
$post->setAuthor($author);
$em = $this->getDoctrine()->getManager();
$em->persist($post);
$em->flush();
if(null != $post->getId()) {
$this->addFlash(
'notice',
'You have successfully created post'
);
return $this->render('success/success.html.twig', array(
'test' => var_dump($pom)
));
}
// This line never be called
return $this->redirectToRoute('home', array(), 301);
}
...
However, you don't need to check if flush worked properly or not, it throws an exception if something goes wrong..
Update for the comment:
if($form->isValid()) {
try {
$user = $this->getUser();
$author = $user->getUsername();
//$post->setPublishDate(new \DateTime);
$post->setAuthor($author);
$em = $this->getDoctrine()->getManager();
$em->persist($post);
$em->flush();
if(null != $post->getId()) {
$this->addFlash(
'notice',
'You have successfully created post'
);
return $this->render('success/success.html.twig', array(
'test' => var_dump($pom)
));
}
} catch (SOMEEXCEPTION $e) {
return $this->redirectToRoute('home', array(), 301);
}
}

Answer 2

Change
return $this->render('success/success.html.twig', array(
'test' => var_dump($pom)
));
if($pom) {
$this->addFlash(
'notice',
'You have successfully created post'
);
}
To
if($pom) {
$this->addFlash(
'notice',
'You have successfully created post'
);
}
return $this->render('success/success.html.twig', array(
'test' => var_dump($pom)
));
You need to add flash before returning the response