feat: special treatment of participants with age 0-2 (babies)

src/Form/Model/ParticipantDto.php

@@ -78,7 +78,8 @@ class ParticipantDto
     public array $courses = [];
     public array $additionalServices = [];
 
-    #[Assert\NotNull(message: 'Bitte auswählen', groups: ['strict_required'])]
+    // Note: Ski pass validation is conditional - see ParticipantEditDto::validateSkiPassRequired()
+    // Babies (0-2 years) are exempt from ski pass requirement
     public ?Service $skiPass = null;
 
     public array $board = [];

src/Form/Model/ParticipantEditDto.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Form\Model;
 
+use App\BusProNet\Constants;
 use App\Validator\Constraints as AppAssert;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
@@ -27,6 +28,39 @@ class ParticipantEditDto
     ) {
     }
 
+    /**
+     * Validates that ski pass is selected when required.
+     *
+     * Ski pass is required for all participants in create mode, EXCEPT for babies
+     * (participants aged 0-2 years at travel date). Babies don't qualify for any
+     * ski pass and the field is hidden for them.
+     *
+     * In edit mode, this validation is skipped as the ski pass is readonly.
+     *
+     * This validation only runs when strict_required group is active.
+     */
+    #[Assert\Callback(groups: ['strict_required'])]
+    public function validateSkiPassRequired(ExecutionContextInterface $context): void
+    {
+        // Skip validation in edit mode - ski pass is readonly
+        if (BookingDto::MODE_EDIT === $this->bookingContext->getMode()) {
+            return;
+        }
+
+        // Baby age exemption: skip validation for participants at or under BABY_MAX_AGE
+        $age = $this->participant->getAge($this->bookingContext->travel->dateFrom);
+        if (null !== $age && $age <= Constants::BABY_MAX_AGE) {
+            return;
+        }
+
+        // Ski pass is required for non-baby participants
+        if (null === $this->participant->skiPass) {
+            $context->buildViolation('Bitte auswählen')
+                ->atPath('participant.skiPass')
+                ->addViolation();
+        }
+    }
+
     /**
      * Validates that insurance is selected when required.
      *