feat(entry): add validation for single non-replaced variant in EntryResource and update tests

app/Domains/FiestaFutbolInfantil/Resources/EntryResource.php

@@ -5,6 +5,7 @@ namespace App\Domains\FiestaFutbolInfantil\Resources;
 use App\Domains\Catalog\Models\CatalogItem;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
+use Illuminate\Validation\ValidationException;
 
 /** @mixin CatalogItem */
 class EntryResource extends JsonResource
@@ -12,14 +13,27 @@ class EntryResource extends JsonResource
     /** @return array<string, mixed> */
     public function toArray(Request $request): array
     {
+        $variants = $this->variants->whereNull('replaced_by_variant_id');
+
+        if ($variants->count() !== 1) {
+            throw ValidationException::withMessages([
+                'entries' => [sprintf(
+                    'La entrada %s tiene %d variantes sin reemplazar (IDs: %s). Se esperaba una.',
+                    $this->id,
+                    $variants->count(),
+                    $variants->pluck('id')->implode(', '),
+                )],
+            ]);
+        }
+
+        $variant = $variants->first();
+
         return [
             'id' => $this->id,
             'title' => $this->nombre,
             'description' => $this->descripcion,
-            'variants' => $this->variants
-                ->whereNull('replaced_by_variant_id')
-                ->values()
-                ->toArray(),
+            'event_date_ids' => $variant->selectedEventDates()->pluck('id')->values(),
+            'stock' => $variant->inventory->real_stock,
             'price' => $this->precio,
         ];
     }