Exercise Files

Ch03/03_Solution/Common/Models/HPlusSportsDbContext.SeedData.cs

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+using System;
+using System.Collections.Generic;
+using System.Data.Entity;
+using System.IO;
+using System.Linq;
+using System.Xml;
+using System.Xml.Linq;
+using HPlusSports.Models;
+using System.Text.RegularExpressions;
+
+namespace HPlusSports
+{
+    public class HPlusSportsDbContextInitializer
+        : DropCreateDatabaseIfModelChanges<HPlusSportsDbContext>
+    {
+        protected override void Seed(HPlusSportsDbContext context)
+        {
+            new SeedData().Populate(context);
+        }
+    }
+
+    internal class SeedData
+    {
+        static readonly Random Random = new Random(1);
+
+        public const string TestUserId = "demo@hplussports.com";
+
+        static readonly IList<string> UserIds =
+          Enumerable.Range(0, 10)
+            .Select(x => $"user{x}")
+            .Concat(new[] { TestUserId })
+            .ToArray();
+
+        public void Populate(HPlusSportsDbContext context)
+        {
+            var doc = ReadTestData();
+            Populate(context, doc);
+        }
+
+        internal void Populate(HPlusSportsDbContext context, XDocument doc)
+        {
+            var categories = doc.Descendants("Categories").Descendants("Category")
+              .Select(x => new Category
+              {
+                  Key = ToKey(x.Element("Name").Value),
+                  Name = x.Element("Name").Value,
+                  Image = new Image { Url = x.Element("ImageUrl").Value },
+              })
+              .ToArray();
+
+            context.Images.AddRange(categories.Select(x => x.Image));
+            context.SaveChanges();
+
+            context.Categories.AddRange(categories);
+            context.SaveChanges();
+
+            var products = doc.Descendants("Product")
+              .Select(x =>
+              {
+                  var product = new Product
+                  {
+                      CategoryId = categories.First(cat => cat.Name == x.Element("Category").Value).Id,
+                      Name = x.Element("Name").Value,
+                      Description = StripHtml(x.Element("Description").Value),
+                      MSRP = double.Parse(x.Element("MSRP").Value),
+                      Price = double.Parse(x.Element("Price").Value),
+                      SKU = x.Element("SKU").Value,
+                      Summary = x.Element("Summary").Value,
+                      LastUpdated = DateTime.UtcNow,
+                      LastUpdatedUserId = "admin@hplussports.com",
+                      ThumbnailImage = new Image { Url = x.Element("ThumbnailImageUrl").Value },
+                  };
+
+                  product.Images.Add(new Image { Url = x.Element("ImageUrl").Value });
+
+                  return product;
+              })
+              .ToArray();
+
+            context.Products.AddRange(products);
+            context.SaveChanges();
+
+            var reviews = context.Products.SelectMany(GenerateReviews);
+            context.Reviews.AddRange(reviews);
+            context.SaveChanges();
+        }
+
+        IEnumerable<Review> GenerateReviews(Product product)
+        {
+            return Enumerable.Range(0, Random.Next(10))
+              .Select(i =>
+                new Review
+                {
+                    SKU = product.SKU,
+                    UserId = UserIds[Random.Next(0, UserIds.Count)],
+                    Rating = Random.Next(3, 5),
+                });
+        }
+
+        private static string ToKey(string val)
+        {
+            return val
+              .Replace(" ", "-")
+              .Replace("--", "-")
+              .Replace("--", "-")
+              .ToLowerInvariant();
+        }
+
+        private static XDocument ReadTestData()
+        {
+            var set = new XmlReaderSettings
+            {
+                ConformanceLevel = ConformanceLevel.Fragment
+            };
+
+            using (var stream = typeof(SeedData).Assembly.GetManifestResourceStream("HPlusSports.TestData.xml"))
+            using (var reader = new StreamReader(stream))
+            {
+                return XDocument.Parse(reader.ReadToEnd());
+            }
+        }
+
+        private static string StripHtml(string source)
+        {
+            return
+                Regex.Replace(
+                    Regex.Replace(
+                        source.Replace("<h2>Description</h2>", ""),
+                        "<[^>]*>", 
+                        ""
+                    ),
+                    "&#[^;]*;",
+                    ""
+                )
+                .Trim();
+        }
+    }
+}