Немного поправил слой моделей базы данных

ComputerShopContracts/BindingModels/RequestBindingModel.cs

@@ -13,7 +13,7 @@ namespace ComputerShopContracts.BindingModels
 
 		public int UserId { get; set; }
 
-		public int AssemblyId { get; set; }
+		public int? AssemblyId { get; set; }
 
 		public DateTime DateMake { get; set; } = DateTime.Now;
 

ComputerShopContracts/ViewModels/ComponentViewModel.cs

@@ -7,12 +7,12 @@ namespace ComputerShopContracts.ViewModels
 	{
 		public int Id { get; set; }
 
-		public int UserId { get; }
+		public int UserId { get; set; }
 
 		[DisplayName("Название комплектующей")]
-		public string ComponentName { get; } = string.Empty;
+		public string ComponentName { get; set; } = string.Empty;
 
 		[DisplayName("Стоимость")]
-		public double Cost { get; }
+		public double Cost { get; set; }
 	}
 }

ComputerShopContracts/ViewModels/RequestViewModel.cs

@@ -22,7 +22,7 @@ namespace ComputerShopContracts.ViewModels
 		public string UserLogin { get; set; } = string.Empty;
 
 		//id сборки
-		public int AssemblyId { get; set; }
+		public int? AssemblyId { get; set; }
 
 
 		//!!!МБ НАДО БУДЕТ ПРИВЯЗЫВАТЬ НАЗВАНИЕ СБОРКИ И Т.Д. ДЛЯ ОТЧЁТОВ

ComputerShopDataModels/Models/IRequestModel.cs

@@ -17,7 +17,7 @@ namespace ComputerShopDataModels.Models
 		/// <summary>
 		/// ID сборки
 		/// </summary>
-		int AssemblyId { get; }
+		int? AssemblyId { get; }
 
 		Dictionary<int, IOrderModel> RequestOrders { get; }
 

ComputerShopDatabaseImplement/ComputerShopDatabase.cs

@@ -17,12 +17,23 @@ namespace ComputerShopDatabaseImplement
             AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
             AppContext.SetSwitch("Npgsql.DisableDateTimeInfinityConversions", true);
         }
+		public virtual DbSet<User> Users { get; set; }
+
+		public virtual DbSet<Component> Components { get; set; }
+
+		public virtual DbSet<Assembly> Assemblies { get; set; }
+
+		public virtual DbSet<AssemblyComponent> AssemblyComponents { get; set; }
+
+		public virtual DbSet<Product> Products { get; set; }
+
+		public virtual DbSet<ProductComponent> ProductComponents { get; set; }
+
 
 		public virtual DbSet<Order> Orders { get; set; }
 		public virtual DbSet<Request> Requests { get; set; }
 		public virtual DbSet<Shipment> Shipments { get; set; }
 		public virtual DbSet<ShipmentOrder> ShipmentOrders { get; set; }
 		public virtual DbSet<RequestOrder> RequestOrders { get; set; }
-
 	}
 }

ComputerShopDatabaseImplement/Models/Assembly.cs

@@ -0,0 +1,65 @@
+using ComputerShopContracts.BindingModels;
+using ComputerShopDataModels.Models;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ComputerShopDatabaseImplement.Models
+{
+	public class Assembly : IAssemblyModel
+	{
+		public int Id { get; private set; }
+
+		[Required]
+		public int UserId { get; private set; }
+
+		[Required]
+		public string AssemblyName { get; private set; } = string.Empty;
+
+		[Required]
+		public double Cost { get; private set; }
+
+		[Required]
+		public string Category { get; private set; } = string.Empty;
+
+		[ForeignKey("ComponentId")]
+		public virtual List<AssemblyComponent> Components { get; set; } = new();
+
+		private Dictionary<int, (IComponentModel, int)>? _assemblyComponents;
+
+		[NotMapped]
+		public Dictionary<int, (IComponentModel, int)> AssemblyComponents
+		{
+			get
+			{
+				if (_assemblyComponents == null)
+				{
+					_assemblyComponents = Components.ToDictionary(
+						AsmComp => AsmComp.ComponentId, 
+						AsmComp => (AsmComp.Component as IComponentModel, AsmComp.Count)
+					);
+				}
+
+				return _assemblyComponents;
+			}
+		}
+
+		public static Assembly Create(ComputerShopDatabase Context, AssemblyBindingModel Model)
+		{
+			return new()
+			{
+				Id = Model.Id,
+				UserId = Model.UserId,
+				AssemblyName = Model.AssemblyName,
+				Cost = Model.Cost,
+				Category = Model.Category,
+				Components = Model.AssemblyComponents.Select(x => new AssemblyComponent
+				{
+					Component = Context.Components.First(y => y.Id == x.Key),
+					Count = x.Value.Item2
+				}).ToList(),
+			};
+		}
+
+		// TODO: Update(), ViewModel, UpdateComponents()
+	}
+}

ComputerShopDatabaseImplement/Models/AssemblyComponent.cs

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace ComputerShopDatabaseImplement.Models
+{
+	public class AssemblyComponent
+	{
+		public int Id { get; set; }
+
+		[Required]
+		public int AssemblyId { get; set; }
+
+		[Required]
+		public int ComponentId { get; set; }
+
+		[Required]
+		public int Count { get; set; }
+
+		public virtual Assembly Assembly { get; set; } = new();
+
+		public virtual Component Component { get; set; } = new();
+	}
+}

ComputerShopDatabaseImplement/Models/Component.cs

@@ -0,0 +1,50 @@
+using ComputerShopContracts.BindingModels;
+using ComputerShopContracts.ViewModels;
+using ComputerShopDataModels.Models;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ComputerShopDatabaseImplement.Models
+{
+	public class Component : IComponentModel
+	{
+		public int Id { get; private set; }
+
+		[Required]
+		public int UserId { get; private set; }
+
+		[Required]
+		public string ComponentName { get; private set; } = string.Empty;
+
+		[Required]
+		public double Cost { get; private set; }
+
+		[ForeignKey("ComponentId")]
+		public virtual List<AssemblyComponent> AssemblyComponents { get; set; } = new();
+
+		public static Component Create(ComponentBindingModel Model)
+		{
+			return new()
+			{
+				Id = Model.Id,
+				UserId = Model.UserId,
+				ComponentName = Model.ComponentName,
+				Cost = Model.Cost,
+			};
+		}
+
+		public void Update(ComponentBindingModel Model)
+		{
+			ComponentName = Model.ComponentName;
+			Cost = Model.Cost;
+		}
+
+		public ComponentViewModel ViewModel => new()
+		{
+			Id = Id,
+			UserId = UserId,
+			ComponentName = ComponentName,
+			Cost = Cost,
+		};
+	}
+}

ComputerShopDatabaseImplement/Models/Order.cs

@@ -5,6 +5,7 @@ using ComputerShopDataModels.Models;
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -16,7 +17,6 @@ namespace ComputerShopDatabaseImplement.Models
 	{
 		public int Id { get; set; }
 
-		//!!!ТУТ МБ СДЕЛАТЬ КАК FOREIGN KEY
 		[Required]
 		public int UserId { get; private set; }
 
@@ -32,13 +32,20 @@ namespace ComputerShopDatabaseImplement.Models
 		//!!!мб не нужен
 		public virtual User User { get; set; }
 
+		//!!!ПРОВЕРМТЬ, ЧТО ПАРВИЛЬНЫЕ ВНЕШНИЕ КЛЮЧИ
+
+		[ForeignKey("OrderId")]
+		public virtual List<RequestOrder> RequestOrders { get; set; } = new();
+
+		[ForeignKey("OrderId")]
+		public virtual List<ShipmentOrder> ShipmentOrders { get; set; } = new();
+
 		public static Order? Create(OrderBindingModel model)
 		{
 			if (model == null)
 			{
 				return null;
 			}
-			using var context = new ComputerShopDatabase();
 			return new Order()
 			{
 				Id = model.Id,
@@ -56,7 +63,7 @@ namespace ComputerShopDatabaseImplement.Models
 				return;
 			}
 			using var context = new ComputerShopDatabase();
-			//!!!МБ НАДО БУДЕТ ОБНОВЛЯТЬ ПОЛЬЗОВАТЕЛЯ, НО ОН ПО СУТИ НЕ ДОЛЖЕН ОБНОВЯЛТЬСЯ ПОСЛЕ СОЗДАНИЯ
+			//!!!МБ НАДО БУДЕТ ОБНОВЛЯТЬ ПОЛЬЗОВАТЕЛЯ, НО ОН ПО СУТИ НЕ ДОЛЖЕН ОБНОВЛЯТЬСЯ ПОСЛЕ СОЗДАНИЯ
 			Status = model.Status;
 			context.SaveChanges();
 		}

ComputerShopDatabaseImplement/Models/Product.cs

@@ -0,0 +1,66 @@
+using ComputerShopContracts.BindingModels;
+using ComputerShopDataModels.Models;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ComputerShopDatabaseImplement.Models
+{
+	public class Product : IProductModel
+	{
+		public int Id { get; set; }
+
+		[Required]
+		public int UserId { get; set; }
+
+		[Required]
+		public string ProductName { get; set; } = string.Empty;
+
+		[Required]
+		public double Cost { get; set; }
+
+		[Required]
+		public int Warranty { get; set; }
+
+		public int? ShipmentId { get; set; }
+
+		[ForeignKey("ComponentId")]
+		public virtual List<ProductComponent> Components { get; set; } = new();
+
+		private Dictionary<int, (IComponentModel, int)>? _productComponents;
+
+		[NotMapped]
+		public Dictionary<int, (IComponentModel, int)> ProductComponents
+		{
+			get
+			{
+				if (_productComponents == null)
+				{
+					_productComponents = Components.ToDictionary(
+						ProdComp => ProdComp.ComponentId,
+						ProdComp => (ProdComp.Component as IComponentModel, ProdComp.Count)
+					);
+				}
+
+				return _productComponents;
+			}
+		}
+
+		public static Product Create(ComputerShopDatabase Context, ProductBindingModel Model)
+		{
+			return new()
+			{
+				Id = Model.Id,
+				UserId = Model.UserId,
+				ProductName = Model.ProductName,
+				Cost = Model.Cost,
+				Warranty = Model.Warranty,
+				Components = Model.ProductComponents.Select(x => new ProductComponent
+				{
+					Component = Context.Components.First(y => y.Id == x.Key),
+					Count = x.Value.Item2
+				}).ToList(),
+				ShipmentId = Model.ShipmentId,
+			};
+		}
+	}
+}

ComputerShopDatabaseImplement/Models/ProductComponent.cs

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace ComputerShopDatabaseImplement.Models
+{
+	public class ProductComponent
+	{
+		public int Id { get; set; }
+
+		[Required]
+		public int ProductId { get; set; }
+
+		[Required]
+		public int ComponentId { get; set; }
+
+		[Required]
+		public int Count { get; set; }
+
+		public virtual Product Product { get; set; } = new();
+
+		public virtual Component Component { get; set; } = new();
+	}
+}

ComputerShopDatabaseImplement/Models/Request.cs

@@ -12,6 +12,7 @@ using System.Threading.Tasks;
 namespace ComputerShopDatabaseImplement.Models
 {
 	//!!!ДОБАВИТЬ МЕТОД ПО ПРИВЯЗКЕ СБОРКИ
+	//!!!МБ У Id сделать private set у ВСЕХ МОИХ МОДЕЛЕЙ
 	public class Request : IRequestModel
 	{
 		public int Id { get; set; }
@@ -20,9 +21,11 @@ namespace ComputerShopDatabaseImplement.Models
 
 		public virtual User User { get; set; }
 
-		public int AssemblyId { get; set; }
+		public int? AssemblyId { get; set; }
+
 		[Required]
 		public DateTime DateMake { get; set; }
+
 		[Required]
 		public string ClientFIO { get; set; } = string.Empty;
 
@@ -36,14 +39,17 @@ namespace ComputerShopDatabaseImplement.Models
 				if (_requestOrders == null)
 				{
 					//!!!ТУТ ПРОПИСАТЬ ЛОГИКУ (НЕ ЗНАЮ ПОКА, КАК)
-
+					if (_requestOrders == null)
+					{
+						_requestOrders = Orders.ToDictionary(x => x.OrderId, x => (x.Order as IOrderModel));
+					}
 
 				}
 				return _requestOrders;
 			}
 		}
 
-		[ForeignKey("OrderId")]
+		[ForeignKey("RequestId")]
 		public virtual List<RequestOrder> Orders { get; set; } = new();
 
 		public static Request Create(ComputerShopDatabase context, RequestBindingModel model)

ComputerShopDatabaseImplement/Models/Shipment.cs

@@ -16,7 +16,6 @@ namespace ComputerShopDatabaseImplement.Models
 	{
 		public int Id { get; set; }
 
-		//!!!ТУТ МБ СДЕЛАТЬ КАК FOREIGN KEY
 		[Required]
 		public int UserId { get; private set; }
 
@@ -42,17 +41,16 @@ namespace ComputerShopDatabaseImplement.Models
 				if (_shipmentOrders == null)
 				{
 					//!!!ТУТ ПРОПИСАТЬ ЛОГИКУ (НЕ ЗНАЮ ПОКА, КАК)
-
-
+					_shipmentOrders = Orders.ToDictionary(x => x.OrderId, x => (x.Order as IOrderModel));
 				}
 				return _shipmentOrders;
 			}
 		}
 		//!!!ПРОВЕРИТЬ, ЧТО ТУТ ПРАВИЛЬНО СДЕЛАНО (ЧТО НАЗВАНИЕ ПРАВИЛЬНОЕ У ВНЕШ. КЛЮЧА, ЧТО ПРАВИЛЬНЫЙ ТИП в <>)
-		[ForeignKey("OrderId")]
+		[ForeignKey("ShipmentId")]
 		public virtual List<ShipmentOrder> Orders { get; set; } = new();
 
-		//!!!МБ ТУТ НАДО БУДЕТ ПРИСВАИВАТЬ ORDERS (но вряд ли, потому что по заданию заказы привязываются отдельно)
+
 		//!!!ПРОВЕРИТЬ, ЧТО ПРАВИЛЬНО ПРИСВАИВАЮ ЗНАЧЕНИЕ СПИСКУ ЗАКАЗОВ
 		public static Shipment Create(ComputerShopDatabase context, ShipmentBindingModel model)
 		{
@@ -96,7 +94,6 @@ namespace ComputerShopDatabaseImplement.Models
 			//удаление тех заказов, которых нет в модели
 			if (shipmentOrders != null && shipmentOrders.Count > 0)
 			{
-				
 				//!!!ТУТ МБ НЕ  x.OrderId, а x.ShipmentId, но не факт (вряд ли)
 				context.ShipmentOrders.RemoveRange(shipmentOrders.Where(x => !model.ShipmentOrders.ContainsKey(x.OrderId)));
 				context.SaveChanges();