fix: added merchant_id to printing_order and plate_order

api_v1/views/printing/views.py

@@ -740,9 +740,13 @@ class PlateOrderViewSet(LimitedModelViewSet):
 
     def perform_create(self, serializer):
         """
-        创建时自动绑定创建人（created_by），不允许前端传参控制。
+        创建时自动绑定创建人（created_by）和商户（merchant），不允许前端传参控制。
         """
-        serializer.save(created_by=self.request.user)
+        user = self.request.user
+        merchant = None
+        if hasattr(user, 'employee') and user.employee and user.employee.merchant:
+            merchant = user.employee.merchant
+        serializer.save(created_by=user, merchant=merchant)
     
     @action(detail=True, methods=['post'])
     def invalidate(self, request, pk=None):