check null safety for delivery

lib/domain/entities/carton.dart

@@ -64,9 +64,8 @@ class Carton {
   // String get packageNumber =>
   //     shipmentNumber + "-" + receiverNumber + " #" + boxNumber;
 
-  double get actualWeight => cargoTypes == null
+  double get actualWeight =>
-      ? 0
+      cargoTypes == null ? 0 : cargoTypes.fold(0, (p, e) => e.weight + p);
-      : cargoTypes.fold(0, (p, e) => e.weight  + p);
 
   int getShipmentWeight(double volumetricRatio) {
     if (length == null ||
@@ -115,8 +114,8 @@ class Carton {
 
     double total = 0;
     cargoTypes.forEach((e) {
-      double r = e.rate -
+      double r =
-          (discountByWeight != null ? (discountByWeight.discount) : 0);
+          e.rate - (discountByWeight != null ? (discountByWeight.discount) : 0);
       double amount = e.weight * r;
       total += amount;
     });
@@ -194,7 +193,8 @@ class Carton {
   }
 
   factory Carton.fromMap(Map<String, dynamic> map, String docID) {
-    var _arrivedDate = (map['arrived_date'] as Timestamp);
+    var _arrivedDate =
+        map['arrived_date'] == null ? null : (map['arrived_date'] as Timestamp);
     var da = map['delivery_address'];
     var _da = da != null ? DeliveryAddress.fromMap(da, da["id"]) : null;
     var cargoTypesMaps =

lib/pages/delivery/model/delivery_model.dart

@@ -4,17 +4,17 @@ import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:fcs/data/services/services.dart';
 import 'package:fcs/domain/constants.dart';
 import 'package:fcs/domain/entities/carton.dart';
-import 'package:fcs/domain/vo/message.dart';
 import 'package:fcs/helpers/paginator.dart';
 import 'package:fcs/pages/main/model/base_model.dart';
 import 'package:logging/logging.dart';
 
 class DeliveryModel extends BaseModel {
   final log = Logger('DeliveryModel');
-  List<Carton> get cartons =>
+  List<Carton> get cartons => _selectedIndex == 1
-      _selectedIndex == 1 ? _cartons : List<Carton>.from(_delivered.values);
+      ? _cartons
+      : List<Carton>.from(_delivered?.values ?? []);
 
-  late Paginator _delivered;
+  Paginator? _delivered;
   int _selectedIndex = 1;
   bool isLoading = false;
   List<Carton> _cartons = [];
@@ -31,9 +31,9 @@ class DeliveryModel extends BaseModel {
     _selectedIndex = 1;
     _loadCartons();
 
-    if (_delivered != null) _delivered.close();
+    if (_delivered != null) _delivered!.close();
     _delivered = _getDelivered();
-    _delivered.load();
+    _delivered!.load();
   }
 
   Future<void> _loadCartons() async {
@@ -57,7 +57,8 @@ class DeliveryModel extends BaseModel {
             _cartons.clear();
             _cartons = snapshot.docs.map((documentSnapshot) {
               var s = Carton.fromMap(
-                  documentSnapshot.data as Map<String, dynamic>, documentSnapshot.id);
+                  documentSnapshot.data as Map<String, dynamic>,
+                  documentSnapshot.id);
               return s;
             }).toList();
             notifyListeners();
@@ -82,10 +83,10 @@ class DeliveryModel extends BaseModel {
   }
 
   Future<void> loadMore() async {
-    if (_delivered.ended || _selectedIndex == 1) return;
+    if (_delivered!.ended || _selectedIndex == 1) return;
     isLoading = true;
     notifyListeners();
-    await _delivered.load(onFinished: () {
+    await _delivered!.load(onFinished: () {
       isLoading = false;
       notifyListeners();
     });
@@ -94,7 +95,7 @@ class DeliveryModel extends BaseModel {
   Future<void> refresh() async {
     if (_selectedIndex == 1) return;
 
-    await _delivered.refresh(onFinished: () {
+    await _delivered!.refresh(onFinished: () {
       notifyListeners();
     });
   }
@@ -106,7 +107,7 @@ class DeliveryModel extends BaseModel {
   @override
   logout() async {
     if (listener != null) await listener!.cancel();
-    if (_delivered != null) _delivered.close();
+    if (_delivered != null) _delivered!.close();
     _cartons = [];
   }
 

lib/pages/fcs_shipment/model/fcs_shipment_model.dart

@@ -58,7 +58,8 @@ class FcsShipmentModel extends BaseModel {
         _fcsShipments.clear();
         _fcsShipments = snapshot.docs.map((documentSnapshot) {
           var s = FcsShipment.fromMap(
-              documentSnapshot.data() as Map<String,dynamic>, documentSnapshot.id);
+              documentSnapshot.data() as Map<String, dynamic>,
+              documentSnapshot.id);
           return s;
         }).toList();
         notifyListeners();

lib/pages/package/package_info.dart

@@ -56,7 +56,7 @@ class _PackageInfoState extends State<PackageInfo> {
     PackageModel packageModel =
         Provider.of<PackageModel>(context, listen: false);
     Package? package =
-        await packageModel.getPackageByTrackingID(pkg!.trackingID!);
+        await packageModel.getPackageByTrackingID(pkg.trackingID!);
     setState(() {
       _package = package;
       multiImgController.setImageUrls = package!.photoUrls;