I have a Review Entity that is related to a User Entity through

#[ORMManyToOne(targetEntity: User::class, inversedBy: 'reviews')]
private User $user;

and when trying to save it like this:

$review = new Review();
$review->setUserId($user->getId());
$this->entityManager->persist($review);
$this->entityManager->flush();

I receive this error:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'user_id' cannot be null

Although I’m calling the $review->setUserId($user->getId());.

I know I can fix it by calling $review->setUser($user); as well, but I want to understand why? I mean when dd the Entity, I see the user_id is not null.

AppEntityDatabaseReview {#825
  -id: null
  -user_id: 1