fix carton

lib/domain/entities/carton.dart

@@ -60,6 +60,7 @@ class Carton {
   //for mix box
   String mixBoxType;
   List<Carton> mixCartons;
+  List<String> mixCartonIDs;
 
   int get amount => rate != null && weight != null ? rate * weight : 0;
 
@@ -172,10 +173,11 @@ class Carton {
       this.cartonSizeID,
       this.cartonSizeName,
       this.mixBoxType,
-      this.mixCartons});
+      this.mixCartons,
+      this.mixCartonIDs});
 
   Map<String, dynamic> toMap() {
-    List _cargoTypes = cargoTypes.map((c) => c.toMap()).toList();
+    List _cargoTypes = cargoTypes?.map((c) => c.toMap())?.toList() ?? [];
     List _packages = packages?.map((c) => c.toJson())?.toList();
     List _mixCartons = mixCartons?.map((c) => c.toJson())?.toList();
     return {
@@ -246,6 +248,7 @@ class Carton {
       senderID: map['sender_id'],
       senderFCSID: map['sender_fcs_id'],
       senderName: map['sender_name'],
+      mixCartonIDs: List<String>.from(map['mix_carton_ids'] ?? []),
     );
   }