diff --git a/app/common/model/StockOrderItems.php b/app/common/model/StockOrderItems.php
index f45c532..34d6934 100644
--- a/app/common/model/StockOrderItems.php
+++ b/app/common/model/StockOrderItems.php
@@ -45,7 +45,14 @@ class StockOrderItems extends Model
         'id', 'order_id', 'product_code', 'sku_id', 'sku_snapshot', 
         'model_snapshot', 'quantity', 'color_interior_code', 'color_interior_snapshot', 
         'color_exterior_code', 'color_exterior_snapshot', 'remark', 'vin', 'created_at', 'updated_at',
-        'mileage', 'unique_id'
+        'mileage', 'unique_id', 'attachment'
+    ];
+
+    /**
+     * 字段类型转换：attachment 以 JSON 数组存取（写自动 json_encode、读自动 decode）
+     */
+    protected $casts = [
+        'attachment' => 'array',
     ];
 
     /**
diff --git a/app/common/service/StockOrdersService.php b/app/common/service/StockOrdersService.php
index 3f72586..cab4fcb 100644
--- a/app/common/service/StockOrdersService.php
+++ b/app/common/service/StockOrdersService.php
@@ -644,6 +644,8 @@ class StockOrdersService
         foreach ($vehList as $veh) {
             $veh['order_id'] = $order->id;
             $veh['unique_id'] = $this->generateVehicleUniqueId($veh);
+            // 车辆附件：归一化数组（由模型 attachment=>'array' cast 自动序列化为 JSON 落库）
+            $veh['attachment'] = is_array($veh['attachment'] ?? null) ? array_values($veh['attachment']) : [];
             
             $item = StockOrderItems::create($veh);
             
@@ -667,7 +669,7 @@ class StockOrdersService
      */
     private function generateVehicleUniqueId(array $veh): string
     {
-        $keysToRemove = ['remark', 'modify_list', 'order_id'];
+        $keysToRemove = ['remark', 'modify_list', 'order_id', 'attachment'];
         $array = array_diff_key($veh, array_flip($keysToRemove));
         $uniqueIdStr = json_encode($array);
         return md5($uniqueIdStr);