feat: implement polymorphic relationships for group items to support bundles and product variants

app/Domains/Bundle/Models/Bundle.php

@@ -2,6 +2,7 @@
 
 namespace App\Domains\Bundle\Models;
 
+use App\Domains\Catalog\Models\GroupItem;
 use App\Domains\Shared\Contracts\Buyable;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
@@ -10,6 +11,7 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
 
 #[Fillable([
     'tenant_codigo',
@@ -48,6 +50,14 @@ class Bundle extends Model implements Buyable
         return $this->hasMany(BundleItem::class, 'bundle_id');
     }
 
+    /**
+     * @return MorphMany<GroupItem, $this>
+     */
+    public function groupItems(): MorphMany
+    {
+        return $this->morphMany(GroupItem::class, 'groupable');
+    }
+
     public function getPrice(): float
     {
         return (float) $this->precio;