feat: edit selected accommodation of bookings in draft

src/Form/Admin/Groups/AccommodationBookingChangeAccommodationType.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Admin\Groups;
+
+use App\Entity\Groups\Accommodation;
+use App\Entity\Groups\AccommodationBooking;
+use Symfony\Bridge\Doctrine\Form\Type\EntityType;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+/**
+ * Corrects the Gruppenhaus of a draft that was created against the wrong one. It is its own
+ * form rather than a field on AccommodationBookingType because the service choices there are
+ * resolved server-side from the current accommodation — changing it has to rebuild the whole
+ * edit form, which is why this runs as a modal that redirects back to it.
+ *
+ * The field is unmapped, the way the service fields on the edit form are: swapping the house
+ * drops the booked services along with it, so the change goes through
+ * AccommodationBookingService::changeAccommodation() as one transition instead of being
+ * written onto the entity piecemeal by the form.
+ *
+ * @extends AbstractType<AccommodationBooking>
+ */
+class AccommodationBookingChangeAccommodationType extends AbstractType
+{
+    public function buildForm(FormBuilderInterface $builder, array $options): void
+    {
+        $builder
+            ->add('accommodation', EntityType::class, [
+                'class' => Accommodation::class,
+                'mapped' => false,
+                'choice_label' => 'name',
+                'label' => 'Gruppenhaus neu',
+                'data' => $options['current_accommodation'],
+            ])
+        ;
+    }
+
+    public function configureOptions(OptionsResolver $resolver): void
+    {
+        $resolver->setDefaults([
+            'data_class' => AccommodationBooking::class,
+            // Only ever reached for an Entwurf, which is a scratch record the office fills in
+            // over time — the `edit` group would reject it over contact data this form does
+            // not even show.
+            'validation_groups' => ['Default'],
+            'current_accommodation' => null,
+        ]);
+        $resolver->setAllowedTypes('current_accommodation', ['null', Accommodation::class]);
+    }
+}