Add favorite with symfony - php

Question

I am learning symfony.
I try to save favorite when I click on a link and when I click again on the link, I wish I could remove the favorite in DB.
When clicking, I do have a new row in my database.
If I click again, it add a new one and don't erase the row.
This is what i have done in my controller:
public function addFavorite(EntityManagerInterface $manager, PostRepository $postRepository, Post $post)
{
$favorite = $postRepository->findOneBy(['content' => $post,'author' => $this->getUser()
]);
if (is_null($favorite)) {
$favorite = new Favorite();
$favorite
->setPost($post)
->setUser($this->getUser());
$manager->persist($favorite);
$manager->flush();
return $this->render('favorite/index.html.twig');
} else {
$manager->remove($favorite);
$manager->flush();
return $this->render('favorite/index.html.twig');
}
}
From what i understand, the problem is that $favorite is still NULL and i don't understand why...
If someone could help me, thanks !

Answer 1

I think it's because you don't request the good entity. I don't really know your entities, but I think this could be more logical :
public function addFavorite(EntityManagerInterface $manager, FavoriteRepository $favoriteRepository, Post $post)
{
$favorite = $favoriteRepository->findOneBy([
'post' => $post,
'user' => $this->getUser()
]);
if (!$favorite) {
$favorite = new Favorite();
$favorite
->setPost($post)
->setUser($this->getUser());
$manager->persist($favorite);
} else {
$manager->remove($favorite);
}
$manager->flush();
return $this->render('favorite/index.html.twig');
}