Symfony form many-to-many without collection - php

Question

I have 2 entities, User and Account. An Account can be own by multiple users and a User can own multiple Account. So I have this entity UserHasAccount that is handling this relation, plus some few fields that have personalised values for each User - Account relation, such as position, showInMenu, showInSideBar.
In the settings of the account, when a user is logged in I want to display those options but only for the current logged user.
So I end up with 2 form type:
AccountEditType:
class AccountEditType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', null, array(
'label' => 'account.form.name',
'translation_domain' => 'AcmeAccountBundle',
))
->add('timezone', 'genemu_jqueryselect2_timezone', array(
'label' => 'account.form.timezone',
'translation_domain' => 'AcmeAccountBundle',
))
->add('accountUser', new UserAccountEditType($options['user']))
;
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\AccountBundle\Entity\Account',
'user' => null,
'validation_groups' => array('AcmeUpdateAccount'),
'cascade_validation' => true,
));
}
public function getName()
{
return 'acme_account_edit_settings';
}
}
UserAccountEditType:
class UserAccountEditType extends AbstractType
{
protected $user;
public function __construct($user)
{
$this->user = $user;
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('showInMenu', null, array(
'label' => 'account.user_account.form.show_in_menu',
'translation_domain' => 'AcmeUserBundle',
'required' => false,
))
;
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\UserBundle\Entity\UserHasAccount',
));
}
public function getName()
{
return 'acme_general_account_user';
}
}
The problem is that Account.accountUser is a collection of user and so I cannot use UserAccountEditType which is mapping only one relation (not the collection). If I leave it like this I have the following error:
The form's view data is expected to be an instance of class Acme\UserBundle\Entity\UserHasAccount, but is an instance of class Doctrine\ORM\PersistentCollection
How can I possibly select one of the relation in the form type?
Cheers,
Maxime