update rate

lib/pages/discount/model/discount_model.dart

@@ -1,3 +1,6 @@
+import 'dart:ffi';
+
+import 'package:fcs/data/services/services.dart';
 import 'package:fcs/domain/entities/discount.dart';
 import 'package:fcs/pages/main/model/base_model.dart';
 
@@ -38,13 +41,6 @@ class DiscountModel extends BaseModel {
     return discountList;
   }
 
-  // List<Discount> get discountByCustomer {
-  //   return invoices.where((e) => e.status == "Avaliable").toList()
-  //     ..sort((e1, e2) {
-  //       return e2.invoiceNumber.compareTo(e1.invoiceNumber);
-  //     });
-  // }
-
   void initUser(user) {
     super.initUser(user);
   }
@@ -53,4 +49,10 @@ class DiscountModel extends BaseModel {
   logout() async {
     // discounts = [];
   }
+
+  Future<void> addDiscount(Discount discount) {}
+
+  Future<void> updateDiscount(Discount discount) {}
+
+  Future<void> deleteCargoType(String id) {}
 }