config/packages/translation.yaml

 framework:
-    default_locale: en
+    default_locale: fr
     translator:
         default_path: '%kernel.project_dir%/translations'
         fallbacks:
-            - fr
+            - en
         providers:

src/Form/EtablissementType.php

@@ -8,11 +8,21 @@ use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 use App\Enum\Secteur;
+use Dom\Entity;
+use Symfony\Bridge\Doctrine\Form\Type\EntityType;
+use App\Repository\EtablissementRepository;
 
 class EtablissementType extends AbstractType
 {
+    private EtablissementRepository $etablissementRepository;
+
+    public function __construct(EtablissementRepository $etablissementRepository)
+    {
+        $this->etablissementRepository = $etablissementRepository;
+    }
     public function buildForm(FormBuilderInterface $builder, array $options): void
     {
+        $departements = $this->etablissementRepository->findDistinctDepartements();
         $builder
             ->add('nom')
             ->add('nature')
@@ -23,7 +33,10 @@ class EtablissementType extends AbstractType
             ->add('longitude')
             ->add('latitude')
             ->add('adresse')
-            ->add('departement')
+            ->add('departement', ChoiceType::class, [
+                'choices' => array_combine($departements, $departements),
+                'placeholder' => 'Choisissez un département',
+            ])
             ->add('region')
             ->add('academie')
             ->add('commune')

src/Repository/EtablissementRepository.php

@@ -116,4 +116,13 @@ class EtablissementRepository extends ServiceEntityRepository
             ->getQuery()
             ->getResult();
     }
+    public function findDistinctDepartements(): array
+    {
+        return $this->createQueryBuilder('e')
+            ->select('DISTINCT e.departement')
+            ->where('e.departement IS NOT NULL')
+            ->orderBy('e.departement', 'ASC')
+            ->getQuery()
+            ->getSingleColumnResult(); // pour avoir un tableau simple de chaînes
+    }
 }

templates/etablissement/edit.html.twig

@@ -7,7 +7,7 @@
         <input type="hidden" name="_method" value="PUT"> {# Indique à Symfony d'interpréter la requête comme un PUT #}
         {{ form_widget(form) }}
         <button type="submit" class="btn btn-primary">Modifier</button>
+        <a href="{{ path('app_etablissements') }}" class="btn btn-secondary">Annuler</a>
     {{ form_end(form) }}
 
-    <a href="{{ path('app_etablissements') }}" class="btn btn-secondary">Annuler</a>
 {% endblock %}