Query builder on entity form generate bulk select on OneToOne relation - symfony

Question

For better understanding, I will simply put the context.
I have a User entity who has a BankAccount relation.
Here, my User class:
/**
* User
*
* #ORM\Table(name="fos_user")
* #ORM\Entity(repositoryClass="AppBundle\Repository\UserRepository")
*/
class User extends BaseUser
{
// [...]
/**
* #ORM\OneToOne(targetEntity="AppBundle\Entity\BankAccount", mappedBy="customer")
*/
private $bankAccount;
// [...]
}
And my bank Account class:
/**
* BankAccount
*
* #ORM\Table(name="bank_account")
* #ORM\Entity
* #DoctrineAssert\UniqueEntity({"iban"})
* #DoctrineAssert\UniqueEntity({"mandateRef"})
* #ORM\HasLifecycleCallbacks
*/
class BankAccount
{
// [...]
/**
* #var User
*
* #ORM\OneToOne(targetEntity="AppBundle\Entity\User", inversedBy="bankAccount")
* #ORM\JoinColumn(name="customer_id", referencedColumnName="id", onDelete="CASCADE")
*/
private $customer;
// [...]
}
I want to create a filter form who will be a basic entity type for user with some orderBy statement. I will so use the query_builder options:
->add('customer', null, array(
'query_builder' => function (UserRepository $er) {
return $er->createQueryBuilder('u')
->select('u')
->orderBy('u.firstname, u.lastname, u.username')
;
},
'property' => 'fullnameWithUsername',
))
This will generate a lot a BankAccount selects made by doctrine, for each user:
If I deactivate the query builder, no more additional select but we have a left join on user select:
So the solution could be to manually add the join statement on my query builder as described here but I think it's quite ugly and by the way, I absolutely don't need the user's bank account for this form.
So my question is: How can I tell Doctrine to not always try to get user's bank account relation?
Note: I already try all fetch options on both entities, not working.
Thanks for your help!

Answer 1

If you change that OneToOne relationship to be a OneToMany (even though it really isn't), Doctrine will stop loading the bank account entity.
It's dirty, but far as I know there's no other way to stop it happening.