persist and flush objects from a session

Question

I have two controllers, one that record the modified entities and put them in a session:

public function update_accountAction(Request $request)
{   
    Try
    {
        $code = $request->request->get('code'); 
        $name = $request->request->get('name'); 

        $em = $this->getDoctrine()->getManager();
        $repo = $em->getRepository('NRtworksChartOfAccountsBundle:Accounttree');

        $to_change = new Accounttree();
        $to_change = $repo->findOneByCode($code);

        $to_change->setName($name);
        $to_change->setCode($code);

        $session = $this->getRequest()->getSession();
        $entity_to_update = $session->get('entity_to_update');

        $counter = $session->get('number_of_changes');

        $entity_to_update[] = $to_change;  

        $counter = $counter +1;

        $session->set('number_of_changes',$counter);
        $session->set('entity_to_update',serialize($entity_to_update));


        $response = array("code" => 100, "success" => true, "modified" => $entity_to_update);
        return new Response(json_encode($response));
    }
    Catch(Exception $e)
    {
        $response = array("code" => 100, "success" => false, "error" => $e);
        return new Response($response);
    }

}

And another one that loop on the results, and if it's actually one of the desired object persist it. Finally I flush.

public function save_changesAction()
 {
     Try
     {
         $em = $this->getDoctrine()->getManager();

         $session = $this->getRequest()->getSession();

         $entity_to_update = unserialize($session->get('entity_to_update'));


         foreach($entity_to_update as $account)
         {
             if($account->getId())
             {                     
                $em->persist($account); 
                echo $account->getId();
             }
             else
             {
                   echo "error";
             }
         }

         $em->flush();
         $response = array("code" => 100, "success" => true, "modified" => $account->getId());
         return new Response(json_encode($response));
     }
     Catch(Exception $e)
     {
        $response = array("code" => 100, "success" => false, "error" => $e);
        return new Response($response);
     }

}

So the result of this is: ContextErrorException: Notice: Undefined index: 000000007a60b041000000007ae6afd8 in /home/eagle1/www/Symfony24/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php line 2852

I don't understand why, because it seems that I get back a fully functional object (I can execute its functions, access its property and it seems also that the persist is working...

Somebody knows the answer ?

Answer 1

When you pull object from session, it is not managed by doctrine. You have to merge it back to notify entity manager about it.

if($account->getId())
{                     
    $account = $em->merge($account);
    $em->persist($account); 
    echo $account->getId();
 }

Doctrine has manual section for Entities in the Session