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CarCenterDatabaseImplement/Models/Account.cs

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+using CarCenterContracts.BindingModels;
+using CarCenterContracts.Extensions;
+using CarCenterContracts.ViewModels;
+using CarCenterDataModels;
+using System.ComponentModel.DataAnnotations;
+
+namespace CarCenterDatabaseImplement.Models
+{
+    public class Account : IAccountModel
+    {
+        [Required]
+        public int ClientByCarId { get; private set; }
+
+        [Required]
+        public DateOnly DateOfAccount { get; private set; }
+
+        [Required]
+        public double Price { get; private set; }
+
+        public int Id { get; private set; }
+
+        [Required]
+        public ClientByCar? ClientByCar { get; private set; }
+
+        public static Account Create(AccountBindingModel model) => model.CastWithCommonProperties<Account, AccountBindingModel>();
+
+        public static implicit operator AccountViewModel(Account? model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException("Возникла ошибка при попытки получить View-модель из null-объекта", nameof(model));
+            }
+            var res = model.CastWithCommonProperties<AccountViewModel, Account>();
+            res.ClientByCar = model.ClientByCar;
+            res.Client = model.ClientByCar?.Client;
+            res.Car = model.ClientByCar?.Car;
+            return res;
+        }
+    }
+}

CarCenterDatabaseImplement/Models/ClientByCar.cs

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+using System.ComponentModel.DataAnnotations;
+using CarCenterDataModels.ProxyModels;
+
+namespace CarCenterDatabaseImplement.Models
+{
+    public class ClientByCar : ClientByCarModel
+    {
+        [Required]
+        public Client? Client { get; private set; }
+        [Required]
+        public Car? Car { get; private set; }
+
+        [Required]
+        public List<Account>? Accounts { get; private set; }
+    }
+}