Symfony - Doctrine - Select query with a user (but can be anonymous user) - php

Question

I'm using symfony 3, and I'm storing some data to database.
For this, the user does not have to be logged in.
Now I've created a select query with $this->getUser();. But the User can be NULL. When I execute this query, it does not select any rows.
return $this->createQueryBuilder('product')
->where('product.user = :user')
->andWhere('product.product = :product')
->andWhere('product.cartId = :uniqueCartId')
->setParameters([
'product' => $product,
'user' => $user,
'uniqueCartId' => $uniqueCartId
])
->getQuery()
->execute();
$user = $this->getUser();
I already tried this:
if(!$user instanceof User) $user = NULL;
But that does not work.
If I remove the User check, it works.
Any ideas?

Answer 1

I guess you should bind the where clause if there is an user object like
$parameters=array(
'product' => $product,
'uniqueCartId' => $uniqueCartId
);
$user = $this->getUser();
$query = $this->createQueryBuilder('product')
->where('product.product = :product')
->andWhere('product.cartId = :uniqueCartId');
if($user != null){ /* if($user instanceof User) */
$parameters['user'] = $user;
$query = $query->andWhere('product.user = :user');
}else{
/* $query = $query->andWhere('product.user IS NULL'); Not necessary */
}
$query->setParameters($parameters)
->getQuery()
->execute();