feat: refactor cart and purchase handling to support polymorphic buyable types and improve code readability

app/Domains/Cart/Services/CartService.php

@@ -2,10 +2,14 @@
 
 namespace App\Domains\Cart\Services;
 
-use App\Domains\Cart\Models\Cart;
 use App\Domains\Auth\Models\User;
+use App\Domains\Bundle\Models\Bundle;
+use App\Domains\Cart\Models\Cart;
+use App\Domains\Catalog\Models\ProductVariant;
 use App\Domains\Tenant\Models\Tenant;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
 use Illuminate\Support\Str;
 use Symfony\Component\HttpFoundation\Cookie;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
@@ -93,9 +97,16 @@ class CartService
     protected function loadCart(Cart $cart): Cart
     {
         return $cart->fresh()->load([
-            'items.variant.product',
-            'items.variant.definitions.productAttribute.attribute',
-            'items.variant.attachments',
+            'items.buyable' => function (MorphTo $morphTo): void {
+                $morphTo->morphWith([
+                    ProductVariant::class => [
+                        'product',
+                        'definitions.productAttribute.attribute',
+                        'attachments',
+                    ],
+                    Bundle::class => ['items.variant'],
+                ]);
+            },
         ]);
     }
 
@@ -104,7 +115,7 @@ class CartService
      */
     protected function resolveIdentity(Request $request, bool $generateGuestToken = false): ?array
     {
-        $user = $request->user() ?? \Illuminate\Support\Facades\Auth::guard('sanctum')->user();
+        $user = $request->user() ?? Auth::guard('sanctum')->user();
 
         if ($user instanceof User) {
             return [
@@ -201,5 +212,4 @@ class CartService
 
         return Cart::query()->firstOrCreate($attributes, ['status' => 'active']);
     }
-
 }