/**
 * @var DoctrineCommonCollectionsCollection
 *
 * @ORMManyToMany(targetEntity="BackendCoreBundleEntityBackendUser")
 * @ORMJoinTable(name="supplier_manager",
 *   joinColumns={
 *     @ORMJoinColumn(name="supplier_id", referencedColumnName="supplier_id")
 *   },
 *   inverseJoinColumns={
 *     @ORMJoinColumn(name="user_id", referencedColumnName="user_id")
 *   }
 * )
 */
private $managers;

$builder
        ->add('name', 'text')
        ->add('contact', 'text')
        ->add('phone', 'text')
        ->add('email', 'email')
        ->add('webSite', 'text', array(
            'required' => false
        ))
        ->add('description', 'textarea', array(
            'required' => false
        ))
        ->add('managers', 'entity', array(
            'class' => 'BackendCoreBundle:BackendUser',
            'choices' => $this->options['granted_users_obj'], //object type is array
            'multiple' => true,
            'choice_label' => 'printname',
            'required' => false
        ))
        ->add('btnSave', 'submit', array('label'  => 'Сохранить и продолжить'));