хочу каникулы

CarCenterDatabaseImplement/Models/Car.cs

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+using CarCenterContracts.BindingModels;
+using CarCenterContracts.Extensions;
+using CarCenterContracts.ViewModels;
+using CarCenterDataModels;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq.Expressions;
+using CarCenterDataModels.ProxyModels;
+
+namespace CarCenterDatabaseImplement.Models
+{
+    public class Car : ICarModel
+    {
+        public int ImplementerId { get; private set; }
+        public string Name { get; private set; } = string.Empty;
+        public double Price { get; set; }
+
+        public DateOnly DateOfReceipt { get; private set; }
+
+        public DateOnly DateOfPassage { get; private set; }
+
+
+        private Dictionary<int, ClientByCarModel>? _cachedClients = null;
+        [NotMapped]
+        public Dictionary<int, ClientByCarModel> ClientsModel => 
+            _cachedClients ??= Clients.Select(x => (ClientByCarModel)x).ToDictionary(x => x.ClientId, x => x);
+
+        public int Id { get; private set; }
+
+        [Required] 
+        public Implementer? Client { get; private set; }
+        [Required] 
+        public List<ClientByCar> Clients { get; private set; } = new();
+
+        [Required] 
+        public List<RequirementByCar> Requirements { get; private set; } = new();
+
+        public static Car Create(CarBindingModel model) =>
+            model.CastWithCommonProperties<Car, CarBindingModel>();
+
+        public static implicit operator CarViewModel?(Car? model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+
+            model._cachedClients = null;
+            var res = model.CastWithCommonProperties<CarViewModel, Car>();
+            res.DirectorLogin = model.Client?.Login ?? string.Empty;
+            res.RequirementViewModels = model.Requirements?
+                .Select(x => (RequirementViewModel)x.Requirement)
+                .ToList() ?? new();
+            foreach (var clientByCar in model.Clients)
+            {
+                if (clientByCar.Client != null)
+                {
+                    res.ClientViewModels.Add(clientByCar.Client.GetViewModel());
+                }
+                else
+                {
+                    res.ClientViewModels = new();
+                    break;
+                }
+            }
+            return res;
+        }
+
+        public void Update(CarBindingModel model)
+        {
+            Price = model.Price;
+            DateOfPassage = model.DateOfPassage;
+        }
+
+        public void UpdateClients(CarCenterDb context, CarBindingModel model)
+        {
+            var oldClients = context.ClientsByCars.Where(x => x.CarId == model.Id).ToDictionary(x => x.ClientId, x => x);
+            var newClients = model.ClientsModel.ToDictionary(
+                x => x.Key, 
+                x =>
+                {
+                    var res = x.Value.CastWithCommonProperties<ClientByCar, ClientByCarModel>();
+                    res.ClientId = x.Key;
+                    res.CarId = Id;
+                    return res;
+                });
+            context.RemoveRange(oldClients.Where(x => !newClients.ContainsKey(x.Key)).Select(x => x.Value));
+            context.SaveChanges();
+            context.AddRange   (newClients.Where(x => !oldClients.ContainsKey(x.Key)).Select(x => x.Value));
+            oldClients
+                .Where(x => newClients.ContainsKey(x.Key))
+                .Select(x => x.Value).ToList()
+                .ForEach(x => x.DateOfClient = newClients[x.ClientId].DateOfClient);
+            context.SaveChanges();
+            _cachedClients = null;
+        }
+    }
+}

CarCenterDatabaseImplement/Models/Implementer.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 Implementer : IImplementerModel
+    {
+        public int Id { get; set; }
+        [Required]
+        public string FirstName { get; private set; } = string.Empty;
+        [Required]
+        public string LastName { get; private set; } = string.Empty;
+
+        [Required]
+        public string Login { get; private set; } = string.Empty;
+        [Required]
+        public string Password { get; private set; } = string.Empty;
+
+        public string PhoneNumber { get; set; } = string.Empty;
+
+        [Required]
+        public List<Car>? Cars { get; private set; }
+
+        public static Implementer Create(ImplementerBindingModel model)
+        {
+            return model.CastWithCommonProperties<Implementer, ImplementerBindingModel>();
+        }
+
+        public static implicit operator ImplementerViewModel?(Implementer? model) => model?.CastWithCommonProperties<ImplementerViewModel, Implementer>();
+    }
+}

CarCenterDatabaseImplement/Models/RequirementByCar.cs

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+using System.ComponentModel.DataAnnotations;
+using CarCenterDataModels.ProxyModels;
+
+namespace CarCenterDatabaseImplement.Models
+{
+    public class RequirementByCar : RequirementByCarModel
+    {
+        [Required]
+        public Requirement? Requirement { get; private set; }
+        [Required]
+        public Car? Car { get; set; }
+    }
+}