Symfony2 Data Transformer on hidden field

Question

I\'ve searched and not found anyone with this problem.

I\'ve created my own Data Transformer as set out in the Cookbook and it all seems right but i get the error:

Answer 1

I just created an input type hidden:

$builder->add('child_id', 'hidden', array('mapped' => false))

In the newAction I did fill with the parent id:

$childForm->get('parent_id')->setData($parentEntity->getId());

And finally in createAction I did put:

$child->setParent($em->getReference('MyBundle:Parent', $form["child_id"]->getData()))

PS: I understand that you wanted to create your Data Transformer, but if your problem is persist object with parent id, it will help you.