Cleaned up readme sample

samples/ReadmeSample/Entities/Order.cs

@@ -12,6 +12,7 @@ namespace ReadmeSample.Entities
         public int Id { get; set; }
         public int UserId { get; set; }
         public DateTime CreatedDate { get; set; }
+        public DateTime? FulfilledDate { get; set; }
 
         public decimal TaxRate { get; set; }
 
@@ -20,6 +21,6 @@ namespace ReadmeSample.Entities
 
         [Projectable] public decimal Subtotal => Items.Sum(item => item.Product.ListPrice * item.Quantity);
         [Projectable] public decimal Tax => Subtotal * TaxRate;
-        [Projectable] public decimal GrandTotal => Subtotal + Tax;
+        [Projectable] public decimal GrandTotal => Subtotal * TaxRate;
     }
 }

samples/ReadmeSample/Extensions/UserExtensions.cs

@@ -11,7 +11,10 @@ namespace ReadmeSample.Extensions
     public static class UserExtensions
     {
         [Projectable]
-        public static Order GetMostRecentOrderForUser(this User user, DateTime? cutoffDate)
+        public static Order GetMostRecentOrderForUser(this User user, bool includeUnfulfilled) => 
-            => user.Orders.Where(x => x.CreatedDate >= cutoffDate).OrderByDescending(x => x.CreatedDate).FirstOrDefault();
+            user.Orders
+                .Where(x => !includeUnfulfilled ? x .FulfilledDate != null : true)
+                .OrderByDescending(x => x.CreatedDate)
+                .FirstOrDefault();
     }
 }

samples/ReadmeSample/Program.cs

@@ -23,7 +23,8 @@ namespace ReadmeSample
             var sampleOrder = new Order {
                 User = sampleUser,
                 TaxRate = .19m,
-                CreatedDate = DateTime.UtcNow,
+                CreatedDate = DateTime.UtcNow.AddDays(-1),
+                FulfilledDate = DateTime.UtcNow,
                 Items = new List<OrderItem> {
                     new OrderItem { Product = sampleProduct, Quantity = 5  }
                 }
@@ -36,7 +37,7 @@ namespace ReadmeSample
             var query = dbContext.Users
                 .Where(x => x.UserName == "Jon")
                 .Select(x => new {
-                    x.GetMostRecentOrderForUser(DateTime.UtcNow.AddDays(-30)).GrandTotal
+                    GrandTotal = x.GetMostRecentOrderForUser(/* includeUnfulfilled: */ false).GrandTotal
                 });
 
             var result = query.First();