Sonata admin form collection - symfony

Question

How to limit the number of embedded form with the type "sonata_type_collection" ?
$formMapper->add('phones', 'sonata_type_collection',
array(
'required' => true,
'by_reference' => false,
'label' => 'Phones',
),
array(
'edit' => 'inline',
'inline' => 'table'
)
I would like limit to last five phones, I found only this solution for now, limit the display in the template twig "edit_orm_one_to_many", but i don't like that.

Answer 1

I found a solution by rewriting the edit action in the controller,
such in the documentation sonataAdminBundle I created my admin controller class:
class ContactAdminController extends Controller
{
public function editAction($id = null)
{
// the key used to lookup the template
$templateKey = 'edit';
$em = $this->getDoctrine()->getEntityManager();
$id = $this->get('request')->get($this->admin->getIdParameter());
// $object = $this->admin->getObject($id);
// My custom method to reduce the queries number
$object = $em->getRepository('GestionBundle:Contact')->findOneAllJoin($id);
if (!$object)
{
throw new NotFoundHttpException(sprintf('unable to find the object with id : %s', $id));
}
if (false === $this->admin->isGranted('EDIT', $object))
{
throw new AccessDeniedException();
}
$this->admin->setSubject($object);
/** #var $form \Symfony\Component\Form\Form */
$form = $this->admin->getForm();
$form->setData($object);
// Trick is here ###############################################
// Method to find the X last phones for this Contact (x = limit)
// And set the data in form
$phones = $em->getRepository('GestionBundle:Phone')->findLastByContact($object, 5);
$form['phones']->setData($phones);
// #############################################################
if ($this->get('request')->getMethod() == 'POST')
{
$form->bindRequest($this->get('request'));
$isFormValid = $form->isValid();
// persist if the form was valid and if in preview mode the preview was approved
if ($isFormValid && (!$this->isInPreviewMode() || $this->isPreviewApproved()))
{
$this->admin->update($object);
$this->get('session')->setFlash('sonata_flash_success', 'flash_edit_success');
if ($this->isXmlHttpRequest())
{
return $this->renderJson(array(
'result' => 'ok',
'objectId' => $this->admin->getNormalizedIdentifier($object)
));
}
// redirect to edit mode
return $this->redirectTo($object);
}
// show an error message if the form failed validation
if (!$isFormValid)
{
$this->get('session')->setFlash('sonata_flash_error', 'flash_edit_error');
}
elseif ($this->isPreviewRequested())
{
// enable the preview template if the form was valid and preview was requested
$templateKey = 'preview';
}
}
$view = $form->createView();
// set the theme for the current Admin Form
$this->get('twig')->getExtension('form')->renderer->setTheme($view, $this->admin->getFormTheme());
return $this->render($this->admin->getTemplate($templateKey), array(
'action' => 'edit',
'form' => $view,
'object' => $object,
));
}
}