save before flutter upgrade

lib/models/service.dart

@@ -0,0 +1,61 @@
+import 'dart:convert';
+
+class Service {
+  Service({
+    required this.serviceId,
+    required this.code,
+    required this.name,
+    this.description,
+    required this.transactionTypeFk,
+    required this.type,
+    required this.value,
+  });
+
+  int serviceId;
+  String code;
+  String name;
+  String? description;
+  int transactionTypeFk;
+  String? type;
+  num value;
+
+  factory Service.fromJson(String str) => Service.fromMap(json.decode(str));
+
+  factory Service.fromMap(Map<String, dynamic> json) {
+    Service service = Service(
+      serviceId: json["service_id"],
+      code: json['code'],
+      name: json['name'],
+      description: json['description'],
+      transactionTypeFk: json['transaction_type_fk'],
+      type: json['type'],
+      value: json['value'],
+    );
+
+    return service;
+  }
+}
+
+class CustomerService {
+  CustomerService({
+    required this.quantity,
+    required this.createdAt,
+    required this.details,
+  });
+
+  int quantity;
+  DateTime createdAt;
+  Service details;
+
+  factory CustomerService.fromJson(String str) => CustomerService.fromMap(json.decode(str));
+
+  factory CustomerService.fromMap(Map<String, dynamic> json) {
+    CustomerService customerService = CustomerService(
+      quantity: json["quantity"],
+      createdAt: DateTime.parse(json['created_at']),
+      details: Service.fromMap(json),
+    );
+
+    return customerService;
+  }
+}