Set form values after bind

FormType.php

class FormType extends AbstractType
{
	// ....

	public function buildForm(FormBuilderInterface $builder, array $options)
	{
		$builder->add('field')
			->add(....)
			->addEventListener(FormEvents::POST_BIND, array($this, 'postBind'));
	}

	public function postBind(FormEvent $e)
	{
		//data is ur entity object here
		$data = $e->getForm()->getData();
		$data->setSomeAdditionalField('someAdditionalData');
	}

        // ....
}