diff --git a/app/Endpoint/Api/Http/Resources/ProductSku/ProductSkuShoppingCartResource.php b/app/Endpoint/Api/Http/Resources/ProductSku/ProductSkuShoppingCartResource.php
deleted file mode 100644
index 626b89ca..00000000
--- a/app/Endpoint/Api/Http/Resources/ProductSku/ProductSkuShoppingCartResource.php
+++ /dev/null
@@ -1,28 +0,0 @@
-<?php
-
-namespace App\Endpoint\Api\Http\Resources\ProductSku;
-
-use Illuminate\Http\Resources\Json\JsonResource;
-
-class ProductSkuShoppingCartResource extends JsonResource
-{
-    /**
-     * Transform the resource into an array.
-     *
-     * @param  \Illuminate\Http\Request  $request
-     * @return array|\Illuminate\Contracts\Support\Arrayable|\JsonSerializable
-     */
-    public function toArray($request)
-    {
-        return [
-            'id' => $this->id,
-            'name' => $this->name,
-            'cover' => (string) $this->cover,
-            'sell_price' => $this->sell_price,
-            'vip_price' => (string) $this->vip_price,
-            'specs' => array_values((array) $this->specs),
-            'stock' => (int) $this->saleable_stock,
-            'is_online' => $this->isOnline(),
-        ];
-    }
-}
diff --git a/app/Endpoint/Api/Http/Resources/ShoppingCartItemResource.php b/app/Endpoint/Api/Http/Resources/ShoppingCartItemResource.php
index 17961846..3d39c90f 100644
--- a/app/Endpoint/Api/Http/Resources/ShoppingCartItemResource.php
+++ b/app/Endpoint/Api/Http/Resources/ShoppingCartItemResource.php
@@ -2,7 +2,6 @@
 
 namespace App\Endpoint\Api\Http\Resources;
 
-use App\Endpoint\Api\Http\Resources\ProductSku\ProductSkuShoppingCartResource;
 use Illuminate\Http\Resources\Json\JsonResource;
 
 class ShoppingCartItemResource extends JsonResource
@@ -17,7 +16,27 @@ class ShoppingCartItemResource extends JsonResource
     {
         return [
             'id' => $this->id,
-            'sku' => ProductSkuShoppingCartResource::make($this->whenLoaded('sku')),
+            'sku' => $this->when($this->relationLoaded('sku') && $this->sku, function () {
+                return [
+                    'id' => $this->sku->id,
+                    'name' => $this->sku->name,
+                    'cover' => (string) $this->sku->cover,
+                    'sell_price' => $this->sku->sell_price,
+                    'vip_price' => (string) $this->sku->vip_price,
+                    'specs' => array_values((array) $this->sku->specs),
+                    'stock' => (int) $this->sku->saleable_stock,
+                    'is_online' => $this->sku->isOnline(),
+                ];
+            }, [
+                'id' => $this->id,
+                'name' => $this->name,
+                'cover' => (string) $this->cover,
+                'sell_price' => $this->sell_price,
+                'vip_price' => (string) $this->vip_price,
+                'specs' => array_values((array) $this->specs),
+                'stock' => 0,
+                'is_online' => false,
+            ]),
             'quantity' => $this->quantity,
         ];
     }
diff --git a/app/Models/ShoppingCartItem.php b/app/Models/ShoppingCartItem.php
index d775ac92..5534fbcb 100644
--- a/app/Models/ShoppingCartItem.php
+++ b/app/Models/ShoppingCartItem.php
@@ -33,15 +33,6 @@ class ShoppingCartItem extends Model
      */
     public function sku()
     {
-        return $this->belongsTo(ProductSku::class)->withDefault(function ($sku, $item) {
-            $sku->id = $item->sku_id;
-            $sku->name = $item->name;
-            $sku->cover = $item->cover;
-            $sku->sell_price = $item->sell_price;
-            $sku->vip_price = $item->vip_price;
-            $sku->specs = $item->specs;
-            $sku->stock = 0;
-            $sku->release_at = null;
-        });
+        return $this->belongsTo(ProductSku::class);
     }
 }