namespace App\Form;

use App\Entity\Category;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\ChoiceList\View\ChoiceView;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\OptionsResolver\OptionsResolver;

class MonFormulaireType extends AbstractType
{

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('categorie', EntityType::class, [
                'label'        => 'Catégorie',
                'class'        => Category::class,
                'choice_label' => 'display_string'
            )
            
            // ...
            
        ;
    }
    
    public function finishView(FormView $view, FormInterface $form, array $options)
    {
        
        // Trier les options du champ 'categorie' selon leur 'label'
        usort(
            $view->children['categorie']->vars['choices'],
            function(ChoiceView $a, ChoiceView $b) {
                return strcasecmp(
                    $a->label,
                    $b->label
                );
            }
        );
        
    }
    
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Category::class,
        ]);
    }
    
}