Exercise Files

Ch05/05_Solution/Common/Models/HPlusSportsDbContext.cs

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+using System.Collections.Generic;
+using System.Data.Entity;
+using System.Linq;
+using HPlusSports.Models;
+
+namespace HPlusSports
+{
+    public class HPlusSportsDbContext : DbContext
+    {
+        public DbSet<Category> Categories { get; set; }
+        public DbSet<Image> Images { get; set; }
+        public DbSet<Product> Products { get; set; }
+        public DbSet<Review> Reviews { get; set; }
+        public DbSet<ShoppingCart> ShoppingCarts { get; set; }
+        public DbSet<ShoppingCartItem> ShoppingCartItems { get; set; }
+
+        public HPlusSportsDbContext()
+            : this("HPlusSports")
+        {
+        }
+
+        public HPlusSportsDbContext(string connectionName)
+            : base(connectionName)
+        {
+        }
+
+        public Product FindProductBySku(string sku)
+          => Products.FirstOrDefault(x => x.SKU == sku);
+
+        public ProductRating GetProductRating(string sku)
+        {
+            var reviews = Reviews.Where(x => x.SKU == sku);
+
+            return new ProductRating
+            {
+                SKU = sku,
+                Rating = reviews.Average(x => (double?)x.Rating),
+                ReviewCount = reviews.Count(),
+            };
+        }
+
+        public IQueryable<ProductRating> GetProductRatings(IEnumerable<string> skus)
+        {
+            return
+              Reviews
+                .Where(x => skus.Distinct().Contains(x.SKU))
+                .GroupBy(x => x.SKU)
+                .Select(reviews => new ProductRating
+                {
+                    SKU = reviews.Key,
+                    Rating = reviews.Average(x => x.Rating),
+                    ReviewCount = reviews.Count(),
+                });
+        }
+    }
+}