preferred_choices实体字段表单永远不会运行

Question

I want to set a form with a "preferred_choices" on top of my select field HTML corresponding to previous submitted datas selected by the user. I want to construct an entity field with a constant list AND a preferred_choices top element if the form is previously submitted.

I never ran correctly this function in symfony2. Can you help me to construct correctly my field form.

Why my preferred_choices options select nothing when the form is construct ? I setting this with correct object setted previously in the code.

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $defaultCQSsearch = new CqsProSansMarque();
    $defaultCQSsearch->setRayLibelle((!array_key_exists('ray_libelle', $options['attr'])) ? null : $options['attr']['ray_libelle']);
    $defaultCQSsearch->setFamLibelle((!array_key_exists('fam_libelle', $options['attr'])) ? null : $options['attr']['fam_libelle']);
    $defaultCQSsearch->setCaeLibelle((!array_key_exists('cae_libelle', $options['attr'])) ? null : $options['attr']['cae_libelle']);

    $builder
        ->add('ray_libelle', 'entity', array(
            'class' => 'ApplicationDriveBundle:CqsProSansMarque',
            'data_class' => 'Application\DriveBundle\Entity\CqsProSansMarque',
            'property' => 'ray_libelle',
            'query_builder' => function(CqsProSansMarqueRepository $er){
                return $er->createQueryBuilder('a')
                ->select('a')
                ->groupBy('a.ray_libelle');
            },
            'preferred_choices' => array($defaultCQSsearch),
            'label' => 'rayon',
            'required' => false,
        ))

Answer 1

preferred_choices option expects an array of values but you are passing an array of object (i.e. $defaultCQSsearch)