Объекты, переданные в поле выбора, должны управляться

Я создаю новый объект и привязываю его к форме. Пользователь заполняет форму и переходит на страницу предварительного просмотра. Я сохраняю ответы пользователя в сеансе.

Проблема возникает, когда я пытаюсь перезагрузить объект из сеанса, когда пользователь вернется, чтобы изменить форму. Я получаю, что сущности, переданные в поле выбора, должны управляться ошибкой.

У кого-нибудь есть идея, где я могу ошибиться? Вот код для контроллеров.

public function previewdealAction(Request $request){

    $session = $this->getRequest()->getSession();
    $coupon = $session->get('coupon');
    $form = $this->createForm(new CouponType(), $coupon);

    if ($request->getMethod() == 'POST') {

        //bind the posted form values
        $form->bindRequest($request);

        //once a valid form is submitted ...
        if ($form->isValid()){
           //Proceed to Previewing deal
            $file = $coupon->getImage();
            $file->upload();
            $session->set('coupon', $coupon);

            $repository = $this->getDoctrine()
            ->getRepository('FrontendUserBundle:Coupon');
            $coupons = $repository->findAll();

            return $this->render('FrontendHomeBundle:Merchant:dealpreview.html.twig', array('coupon'=>$coupon, 'coupons'=>$coupons));

        }
    }

}
public function builddealAction(Request $request){

    $em = $this->get('doctrine')->getEntityManager();
    $user = $this->container->get('security.context')->getToken()->getUser();

    //check for a coupon session variable
    $session = $this->getRequest()->getSession();

    $coupon = $session->get('coupon');

    //If coupon is not set
    if($coupon == NULL){
        $coupon = new Coupon();
        $date = new \DateTime(date("Y-m-d H:i:s"));
        $coupon->setStartdate($date);
        $coupon->setPosterid($user);
        $session->set('coupon', $coupon);
    }

    $form = $this->createForm(new CouponType(), $coupon);
    return $this->render('FrontendHomeBundle:Merchant:builddeal.html.twig', array(
        'form' => $form->createView(),
    ));
}

-

namespace Frontend\HomeBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class CouponType extends AbstractType {

public function buildForm(FormBuilder $builder, array $options) {
    $builder->add('couponname', 'text');
    $builder->add('description', 'textarea');
    $builder->add('price', 'money', array('currency' => 'USD'));
    $builder->add('originalprice', 'money', array('currency' => 'USD'));
    $builder->add('maxlimit', 'integer');
    $builder->add('maxper', 'integer');
    $builder->add('startdate', 'date', array(
        'years' => array(2011, 2012, 2013, 2014),

    ));
    $builder->add('duration', 'choice', array(
        'choices'   => array(
            '3'   => 3,
            '7'   => 7,
            '14' => 14,
            '30'   => 30,
            '60'   => 60,
            '90'   => 90,
            ),
        'expanded'  => false,
        'multiple'  => false,
        ));
    $builder->add('expirationdate', 'choice', array(
        'choices'   => array(
            '30'   => 30,
            '60'   => 60,
            '90' => 90,
            '180'   => 180,
            ),
        'expanded'  => false,
        'multiple'  => false,
        ));
    $builder->add('tip', 'integer');
    $builder->add('salestax', 'choice', array(
       'choices'   => array(
            'included'   => 'Sales tax is included and will be remitted BY YOU at the appropriate tax jurisdiction',
            'exempt'   => 'Sales tax is exempt according to seller\ tax jurisdiction',
            'collected' => 'Sales tax will be collected BY YOU at time of deal redemption',
            ),
        'expanded'  => true,
        'multiple'  => false,
    ));
    $builder->add('signature', 'text');
    $builder->add('city', 'entity', array(
        'class' => 'Frontend\\UserBundle\\Entity\\Cities',
        'expanded' => false,
        'multiple' => false,

    ));
    $builder->add('category', 'entity', array(
        'class' => 'Frontend\\UserBundle\\Entity\\Category',
        'expanded' => false,
        'multiple' => false,
    ));
    $builder->add('address', new AddressType());
    $builder->add('image', new DocumentType());
    $builder->add('maxper', 'choice', array(
        'choices'   => array(
            '1'   => 1,
            '2'   => 2,
            '3' => 3,
            '4'   => 4,
            '5'   => 5,
            '6'   => 6,
            '7' => 7,
            '8'   => 8,
            '9'   => 9,
            '10'   => 10,
            ),
        'expanded'  => false,
        'multiple'  => false,
        ));

}

public function getDefaultOptions(array $options) {
    return array(
        'data_class' => 'Frontend\UserBundle\Entity\Coupon',
    );
}
public function getName()
{
    return 'user';
}

}

heres класс типа купона

Ответы

// an array of form data from session
$entity = $data['my_entity'];

// merge() returns the managed entity
$entity = $this->getDoctrine()->getEntityManager()->merge($entity);

// update the form data array
$data['my_entity'] = $entity;

// Create form with form data 
$form = $this->createForm(new MyFormType(), $data);

if ($this->get('session')->has('filters')) {
    $filters = $this->get('session')->get('filters');
    foreach ($filters as $key => $filter) {
        if (is_object($filter)) {
            $filters[$key] = $em->merge($filter);
        }
    }
    $filterForm = $this->createForm(new FilterType(), $filters);
}

private function manageObjects(&$data_array)
{
    foreach ($data_array as $key => &$value)
        if (is_object($value))
            $data_array[$key] = $this->container->get('doctrine.orm.entity_manager')->merge($value);
        else if (is_array($value))
            $this->manageObjects($value);
}

 /**
 * Merge objects
 * Allow to manage object by doctrine when using stored (eg. in session data values)
 * @param $data_array - list of form fields
 * @return mixed
 */
public function manageObjects($data_array)
{
    foreach ($data_array as $key => $value) {
        // for multi choices
        if ($value instanceof ArrayCollection) {
            $data_array[$key] = $this->manageObjects($value);
        } 
        //ommit dateTime object
        elseif ($value instanceof \DateTime) {

        } 
        elseif (is_object($value)) {
            $data_array[$key] = $this->getService('doctrine.orm.entity_manager')->merge($value);
        }
    }
    return $data_array;
}