Sylius\Bundle\ResourceBundle\Form\Type\ResourceChoiceType::configureOptions PHP Method

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(['class' => null])->setNormalizer('class', function () {
            return $this->metadata->getClass('model');
        });
    }

 public function configureOptions(OptionsResolver $resolver)
 {
     parent::configureOptions($resolver);
     $resolver->setDefaults(array('query_builder' => function (EntityRepository $repository) {
         return $repository->createQueryBuilder('o')->orderBy('o.left', 'asc');
     }));
 }