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Doctrine2 findBy relationship object triggers string conversion error
<?php
// $em instanceof EntityManager, $user instanceof ModelsUser
$comments = $em->getRepository('ModelsComment')
    ->findBy(array('user' => $user, 'public' => true));

<?php
// $em instanceof EntityManager, $user instanceof ModelsUser
$comments = $em->getRepository('ModelsComment')
->findBy(array('user' => $user->getId(), 'public' => true));

<?php

namespace AppDomainRepository;

use DoctrineORMEntityRepository,
    AppDomainEntityUser;

class CommentRepository extends EntityRepository
{

    public function findByUser(User $user)
    {
        // add QueryBuilder code here
    }

}

<?php

namespace AppDomainEntity;


/**
 * @Entity(repositoryClass="AppDomainRepositoryCommentRepository")
 */
class Comment
{

    // entity definition

}