feat: add is_default field to product variants and implement default variant management logic in ProductService

app/Domains/Catalog/Models/ProductVariant.php

@@ -13,6 +13,7 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
 #[Fillable([
     'producto_id',
     'stock',
+    'is_default',
 ])]
 class ProductVariant extends Model
 {
@@ -25,6 +26,7 @@ class ProductVariant extends Model
         return [
             'producto_id' => 'integer',
             'stock' => 'integer',
+            'is_default' => 'boolean',
         ];
     }
 

app/Domains/Catalog/Services/ProductService.php

@@ -44,6 +44,7 @@ class ProductService
             // Create default variant with stock
             $this->createVariant($product, [
                 'stock' => $stock,
+                'is_default' => true,
                 'definitions' => [],
             ]);
 
@@ -116,11 +117,14 @@ class ProductService
             $images = $data['images'] ?? [];
             unset($data['images']);
 
-            // If the variant being created has definitions, it is a real variant.
-            // Remove any default variants (those without definitions).
+            // Determine if the variant being created is a default one
             $hasDefinitions = ! empty($data['definitions']);
-            if ($hasDefinitions) {
-                $defaultVariants = $product->variants()->whereDoesntHave('definitions')->get();
+            $isDefault = $data['is_default'] ?? (! $hasDefinitions);
+            $data['is_default'] = $isDefault;
+
+            // If the variant being created is not a default variant, remove any existing default variants
+            if (! $isDefault) {
+                $defaultVariants = $product->variants()->where('is_default', true)->get();
                 foreach ($defaultVariants as $defaultVariant) {
                     $this->deleteVariantAttachments($defaultVariant);
                     $product->deleteVariant($defaultVariant);
@@ -176,6 +180,7 @@ class ProductService
             if ($product->variants()->count() === 0) {
                 $product->createVariant([
                     'stock' => 0,
+                    'is_default' => true,
                     'definitions' => [],
                 ]);
             }