/**
* @param \Symfony\Component\OptionsResolver\OptionsResolverInterface $resolver
*
* @return void
*/
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
parent::setDefaultOptions($resolver);
$resolver->setRequired('action');
$resolver->setRequired('fields');
$resolver->setDefaults(['attr' => ['class' => 'form-inline']]);
}