AddBameFieldOnlyForCreateNewTaskSusbscriber.php

AddBameFieldOnlyForCreateNewTaskSusbscriber.php

<?php
namespace JuanLuis\LabBundle\Form\EventListener;

use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class AddNameFieldOnlyForCreateNewTaskSubscriber implements EventSubscriberInterface
{
    public static function getSubscribedEvents()
    {
       return array(FormEvents::PRE_SET_DATA => array('preSetData', 0));
    }

    public function preSetData(FormEvent $event)
    {
        $task = $event->getData();
        $form = $event->getForm();

        if(!$task || null === $task->getId()){
            $form->add('name', 'text',
                array(
                    'max_length' => 100
                )
            );
        }
    }
}