final

lib/models/order.dart

@@ -14,8 +14,8 @@ class Order {
   int id;
   int userId;
   int businessId;
-  Business businessInfo;
-  CartInfo cartInfo;
+  Business? businessInfo;
+  CartInfo? cartInfo;
   int status;
   double originPrice;
   double discountPrice;
@@ -23,7 +23,7 @@ class Order {
   String consignee;
   String phone;
   String address;
-  Address shippingAddress;
+  Address? shippingAddress;
   int payMethod;
   String remark;
   String orderNum;
@@ -33,11 +33,11 @@ class Order {
   String paymentStatus; // UNPAID, PAID, PARTIALPAID
   double amountPaid;
   List<Fulfillment> fulfillments;
-  String extraData;
+  String? extraData;
   bool hasComment;
   double fee;
   UserPosition shipperPosition;
-  DistanceInfo deliveryDistance;
+  DistanceInfo? deliveryDistance;
 
   Order.fromJson(Map<String, dynamic> json)
       : id = json['id'],
@@ -100,8 +100,10 @@ class Order {
 
   double getSubtotal() {
     double subtotal = 0.0;
-    for (CartLineItem lineItem in cartInfo.productList) {
-      subtotal += lineItem.getTotalPrice();
+    if (cartInfo != null) {
+      for (CartLineItem lineItem in cartInfo!.productList!) {
+        subtotal += lineItem.getTotalPrice();
+      }
     }
     return subtotal;
   }