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ComputerHardwareStore/ComputerHardwareStoreContracts/BindingModels/PurchaseBindingModel.cs

@@ -8,7 +8,7 @@ namespace ComputerHardwareStoreContracts.BindingModels
         public int VendorId { get; set; }
         public double Cost { get; set; }
         public DateTime DateCreate { get; set; }
-        public Dictionary<int, (IBuildModel, int)> PurchaseBuild { get; set; } = new();
-        public Dictionary<int, (IProductModel, int)> PurchaseProduct { get; set; } = new();
+        public Dictionary<int, (IBuildModel, int)> PurchaseBuilds { get; set; } = new();
+        public Dictionary<int, (IProductModel, int)> PurchaseProducts { get; set; } = new();
     }
 }

ComputerHardwareStore/ComputerHardwareStoreContracts/ViewModels/PurchaseViewModel.cs

@@ -13,8 +13,8 @@ namespace ComputerHardwareStoreContracts.ViewModels
         public int VendorId { get; set; }
         [DisplayName("Сумма")]
         public double Sum { get; set; }
-        public Dictionary<int, (IBuildModel, int)> PurchaseBuild { get; set; } = new();
+        public Dictionary<int, (IBuildModel, int)> PurchaseBuilds { get; set; } = new();
 
-        public Dictionary<int, (IProductModel, int)> PurchaseProduct { get; set; } = new();
+        public Dictionary<int, (IProductModel, int)> PurchaseProducts { get; set; } = new();
     }
 }

ComputerHardwareStore/ComputerHardwareStoreDataModels/Models/IPurchaseModel.cs

@@ -5,7 +5,7 @@
         int VendorId { get; }
         double Cost { get; }
         DateTime DateCreate { get; }
-        public Dictionary<int, (IBuildModel, int)> PurchaseBuild { get; }
-        public Dictionary<int, (IProductModel, int)> PurchaseProduct { get; }
+        public Dictionary<int, (IBuildModel, int)> PurchaseBuilds { get; }
+        public Dictionary<int, (IProductModel, int)> PurchaseProducts { get; }
     }
 }

ComputerHardwareStore/ComputerHardwareStoreDatabaseImplement/ComputerHardwareStoreDBContext.cs

@@ -37,5 +37,8 @@ namespace ComputerHardwareStoreDatabaseImplement
         public virtual DbSet<BuildComponent> BuildComponents { set; get; }
         public virtual DbSet<Comment> Comments { set; get; }
         public virtual DbSet<Vendor> Vendors { set; get; }
+        public virtual DbSet<Purchase> Purchases { set; get; }
+        public virtual DbSet<PurchaseBuild> PurchaseBuilds { set; get; }
+        public virtual DbSet<PurchaseProduct> PurchaseProducts { set; get; }
     }
 }

ComputerHardwareStore/ComputerHardwareStoreDatabaseImplement/Models/Purchase.cs

@@ -0,0 +1,151 @@
+
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.ViewModels;
+using ComputerHardwareStoreDataModels.Models;
+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ComputerHardwareStoreDatabaseImplement.Models
+{
+    public class Purchase : IPurchaseModel
+    {
+        public int Id { get; private set; }
+        [Required]
+        public int VendorId { get; set; }
+        [Required]
+        public double Cost { get; set; }
+        [Required]
+        public DateTime DateCreate { get; set; } = DateTime.Now;
+        private Dictionary<int, (IBuildModel, int)>? _purchaseBuilds = null;
+        [NotMapped]
+        public Dictionary<int, (IBuildModel, int)> PurchaseBuilds
+        {
+            get
+            {
+                if (_purchaseBuilds == null)
+                {
+                    _purchaseBuilds = Builds
+                        .ToDictionary(op => op.BuildId, op => (op.Build as IBuildModel, op.Count));
+                }
+                return _purchaseBuilds;
+            }
+        }
+
+        [ForeignKey("PurchaseId")]
+        public virtual List<PurchaseBuild> Builds { get; set; } = new();
+        private Dictionary<int, (IProductModel, int)>? _purchaseProducts = null;
+        [NotMapped]
+        public Dictionary<int, (IProductModel, int)> PurchaseProducts
+        {
+            get
+            {
+                if (_purchaseProducts == null)
+                {
+                    _purchaseProducts = Products
+                        .ToDictionary(op => op.ProductId, op => (op.Product as IProductModel, op.Count));
+                }
+                return _purchaseProducts;
+            }
+        }
+        [ForeignKey("PurchaseId")]
+        public virtual List<PurchaseProduct> Products { get; set; } = new();
+
+        public static Purchase Create(ComputerHardwareStoreDBContext context, PurchaseBindingModel model)
+        {
+            return new Purchase()
+            {
+                Id = model.Id,
+                Cost = model.Cost,
+                DateCreate = model.DateCreate,
+                Builds = model.PurchaseBuilds.Select(x =>
+                new PurchaseBuild
+                {
+                    Build = context.Builds.First(y => y.Id == x.Key),
+                    Count = x.Value.Item2
+                }).ToList(),
+                Products = model.PurchaseProducts.Select(x =>
+                new PurchaseProduct
+                {
+                    Product = context.Products.First(z => z.Id == z.Key),
+                    Count = x.Value.Item2
+                }).ToList()
+            };
+        }
+        public void Update(PurchaseBindingModel model)
+        {
+            Cost = model.Cost;
+
+        }
+        public PurchaseViewModel GetViewModel => new()
+        {
+            Id = Id,
+            Cost = Cost,
+            DateCreate = DateCreate,
+            PurchaseBuilds = PurchaseBuilds,
+            PurchaseProducts = PurchaseProducts
+        };
+
+        public static void UpdateBuilds(ComputerHardwareStoreDBContext context, PurchaseBindingModel model)
+        {
+            var productBuilds = context.PurchaseBuilds
+                .Where(pc => pc.PurchaseId == model.Id)
+                .ToList();
+            if (productBuilds.Count != 0 && productBuilds.Count > 0)
+            {
+                // удалили те, которых нет в модели
+                context.PurchaseBuilds
+                    .Where(pc => !model.PurchaseBuilds.ContainsKey(pc.BuildId))
+                    .ExecuteDelete();
+                // обновили количество у существующих записей
+                productBuilds
+                    .ForEach(updateBuild =>
+                    {
+                        updateBuild.Count = model.PurchaseBuilds[updateBuild.BuildId].Item2;
+                        model.PurchaseBuilds.Remove(updateBuild.BuildId);
+                    });
+            }
+            // добавили новые
+            context.PurchaseBuilds
+                .AddRange(model.PurchaseBuilds.Values
+                .Select(val => new PurchaseBuild()
+                {
+                    PurchaseId = model.Id,
+                    BuildId = val.Item1.Id,
+                    Count = val.Item2
+                }));
+            context.SaveChanges();
+        }
+
+        public static void UpdateProducts(ComputerHardwareStoreDBContext context, PurchaseBindingModel model)
+        {
+            var productProducts = context.PurchaseProducts
+                .Where(pc => pc.PurchaseId == model.Id)
+                .ToList();
+            if (productProducts.Count != 0 && productProducts.Count > 0)
+            {
+                // удалили те, которых нет в модели
+                context.PurchaseProducts
+                    .Where(pc => !model.PurchaseProducts.ContainsKey(pc.ProductId))
+                    .ExecuteDelete();
+                // обновили количество у существующих записей
+                productProducts
+                    .ForEach(updateProduct =>
+                    {
+                        updateProduct.Count = model.PurchaseProducts[updateProduct.ProductId].Item2;
+                        model.PurchaseProducts.Remove(updateProduct.ProductId);
+                    });
+            }
+            // добавили новые
+            context.PurchaseProducts
+                .AddRange(model.PurchaseProducts.Values
+                .Select(val => new PurchaseProduct()
+                {
+                    PurchaseId = model.Id,
+                    ProductId = val.Item1.Id,
+                    Count = val.Item2
+                }));
+            context.SaveChanges();
+        }
+    }
+}

ComputerHardwareStore/ComputerHardwareStoreDatabaseImplement/Models/PurchaseBuild.cs

@@ -0,0 +1,18 @@
+
+using System.ComponentModel.DataAnnotations;
+
+namespace ComputerHardwareStoreDatabaseImplement.Models
+{
+    public class PurchaseBuild
+    {
+        public int Id { get; set; }
+        [Required]
+        public int PurchaseId { get; set; }
+        [Required]
+        public int BuildId { get; set; }
+        [Required]
+        public int Count { get; set; }
+        public virtual Purchase Purchase { get; set; } = new();
+        public virtual Build Build { get; set; } = new();
+    }
+}

ComputerHardwareStore/ComputerHardwareStoreDatabaseImplement/Models/PurchaseProduct.cs

@@ -0,0 +1,18 @@
+
+using System.ComponentModel.DataAnnotations;
+
+namespace ComputerHardwareStoreDatabaseImplement.Models
+{
+   public class PurchaseProduct
+   {
+        public int Id { get; set; }
+        [Required]
+        public int PurchaseId { get; set; }
+        [Required]
+        public int ProductId { get; set; }
+        [Required]
+        public int Count { get; set; }
+        public virtual Purchase Purchase { get; set; } = new();
+        public virtual Product Product { get; set; } = new();
+   }
+}