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Hope this helps you, two months later :) Best way of doing this is binding a class that implements the EventSubscriberInterface to the pre-bind event in the form object. Using this methods you don't have to edit the controller of the admin generator. <a href="http://www.rjguevara.com/2013/02/symfony-2-ignorar-campos-vacios-en.html" rel="nofollow">Suscriber Listener Ignore Empty fields</a>, the link is in spanish, but I can translated to you, basically you create a class that implements the EventSubscriberInterface interface, the blog post gives you the class: <pre><code>namespace Acme\TestBundle\Admin; use Symfony\Component\Form\FormEvent; use Symfony\Component\Form\FormEvents; use Symfony\Component\Form\FormFactoryInterface; use Symfony\Component\EventDispatcher\EventSubscriberInterface; class IgnoreBlankFieldListener implements EventSubscriberInterface { private $factory; private $name; public function __construct(FormFactoryInterface $factory, $name) { $this->factory = $factory; $this->name = $name; } public static function isNotEmpty($var ) { if(is_array($var)) { $notempty = false; foreach( $var as $v ) { $notempty = $notempty || !IgnoreBlankFieldListener::isNotEmpty($v); } return $notempty; } else return !empty ($var); } public static function isEmpty( $var ) { return IgnoreBlankFieldListener::isNotEmpty($var); } public function preBind(FormEvent $event){ $data = $event->getData(); $data_name = $data[$this->name]; if( IgnoreBlankFieldListener::isEmpty($data_name) ) { $form = $event->getForm(); unset( $data[$this->name] ); $event->setData($data); $form->remove($this->name); } } public static function getSubscribedEvents() { return array(FormEvents::PRE_BIND => 'preBind'); } } </code></pre> Then, you suscribe this class to the form, you do this in the buildForm part of the ClassType definition: <pre><code>public function buildForm(FormBuilder $builder, array $options) { //initial code // $subscriber = new IgnoreBlankFieldListener($builder->getFormFactory(), 'password'); $builder->addEventSubscriber($subscriber); } </code></pre> More info in <a href="http://symfony.com/doc/2.0/cookbook/form/dynamic_form_modification.html" rel="nofollow">Symfony docs</a>
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