wip: form refactoring

src/Form/Service/ParticipantFieldOptionsProvider.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Form\Service;
 
+use App\Form\Model\BookingCreateDto;
 use App\Form\Model\BookingDtoInterface;
 use App\Form\ParticipantFieldHandler\Condition\FieldConditionInterface;
 
@@ -26,6 +27,8 @@ use App\Form\ParticipantFieldHandler\Condition\FieldConditionInterface;
  */
 class ParticipantFieldOptionsProvider implements FieldStateProviderInterface
 {
+    use FormTraversalTrait;
+
     /** @var array<string, callable> Field option providers indexed by field name */
     private array $fieldOptionProviders = [];
 
@@ -120,7 +123,7 @@ class ParticipantFieldOptionsProvider implements FieldStateProviderInterface
      */
     private function registerFieldOptionProviders(): void
     {
-        // Room assignment field provider
+        // Room assignment field provider (only available for create workflow)
         $this->fieldOptionProviders['assignedRoomId'] = fn (BookingDtoInterface $bookingDto, int $participantIndex) => [
             'label' => 'Zimmer',
             'placeholder' => 'Bitte wählen',
@@ -128,11 +131,13 @@ class ParticipantFieldOptionsProvider implements FieldStateProviderInterface
             // - Shows only available rooms for this participant
             // - Excludes rooms already assigned to other participants
             // - Respects room capacity and booking constraints
-            'choice_loader' => $this->roomChoiceLoaderFactory->create(
-                $bookingDto->participants,
-                $bookingDto->getSelectedRooms(),
-                $participantIndex
-            ),
+            'choice_loader' => $bookingDto instanceof BookingCreateDto
+                ? $this->roomChoiceLoaderFactory->create(
+                    $bookingDto->participants,
+                    $bookingDto->getSelectedRooms(),
+                    $participantIndex
+                )
+                : null,
         ];
 
         // Future field providers would be added here, for example: