Exercise Files

Ch05/05_Challenge/HPlusSports/Common/Services/ProductUpdateService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using HPlusSports.Requests;
+
+namespace HPlusSports.Services
+{
+    public class ProductUpdateService
+    {
+        private readonly HPlusSportsDbContext _context;
+
+        public ProductUpdateService(HPlusSportsDbContext context)
+        {
+            _context = context;
+        }
+
+        public UpdateProductResponse Update(UpdateProductRequest request)
+        {
+            var existing = _context.Products.Find(request.Id);
+
+            if (existing == null)
+            {
+                return new UpdateProductResponse
+                {
+                    Success = false,
+                    Message = $"Couldn't update product #\"{request.Id}\": product not found!",
+                };
+            }
+
+            var hasPriceChanged = existing.Price != request.Price;
+
+            existing.CategoryId = request.CategoryId;
+            existing.Description = request.Description;
+            existing.MSRP = request.MSRP;
+            existing.Name = request.Name;
+            existing.Price = request.Price;
+            existing.SKU = request.SKU;
+            existing.Summary = request.Summary;
+            existing.LastUpdated = DateTime.UtcNow;
+            existing.LastUpdatedUserId = request.LastUpdatedUserId;
+
+            _context.SaveChanges();
+
+            if (hasPriceChanged)
+            {
+                var cartsToUpdate =
+                  _context.ShoppingCarts
+                    .Include("Items")
+                    .Where(cart => cart.Items.Any(x => x.SKU == request.SKU));
+
+                foreach (var cart in cartsToUpdate)
+                {
+                    foreach (var cartItem in cart.Items.Where(x => x.SKU == request.SKU))
+                    {
+                        cartItem.Price = request.Price;
+                    }
+
+                    cart.Recalculate();
+                }
+            }
+
+            _context.SaveChanges();
+
+            return new UpdateProductResponse
+            {
+                Success = true,
+                Message = $"Successfully updated \"{request.Name}\"",
+            };
+        }
+    }
+}