From 184df1723c05cd98d8807d83b99ff8cde4eec61f Mon Sep 17 00:00:00 2001
From: ralcaraz <ralcarazerhs@gmail.com>
Date: Mon, 26 Sep 2022 18:20:49 -0700
Subject: [PATCH 1/2] Added optimization

---
 BenchmarkService.cs | 43 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 40 insertions(+), 3 deletions(-)

diff --git a/BenchmarkService.cs b/BenchmarkService.cs
index d0a958d..4ed9546 100644
--- a/BenchmarkService.cs
+++ b/BenchmarkService.cs
@@ -1,4 +1,5 @@
-using BenchmarkDotNet.Attributes;
+using System;
+using BenchmarkDotNet.Attributes;
 using Microsoft.EntityFrameworkCore;
 using OptimizeMePlease.Context;
 using System.Collections.Generic;
@@ -88,9 +89,45 @@ public List<AuthorDTO> GetAuthors()
         [Benchmark]
         public List<AuthorDTO> GetAuthors_Optimized()
         {
-            List<AuthorDTO> authors = new List<AuthorDTO>();
+            using var dbContext = new AppDbContext();
+
+            var bookCutoffDate = new DateTime(1900, 1, 1);
+
+            var youngSerbianAuthorQuery = dbContext
+                .Authors
+                .Where(x => x.Country == "Serbia" && x.Age == 27)
+                .OrderByDescending(x => x.BooksCount)
+                .Take(2)
+                .Select(x => new AuthorDTO
+                {
+                    UserCreated = x.User.Created,
+                    UserEmailConfirmed = x.User.EmailConfirmed,
+                    UserFirstName = x.User.FirstName,
+                    UserLastActivity = x.User.LastActivity,
+                    UserLastName = x.User.LastName,
+                    UserEmail = x.User.Email,
+                    UserName = x.User.UserName,
+                    UserId = x.User.Id,
+                    RoleId = dbContext.UserRoles.Where(y => y.UserId == x.UserId).Select(u => u.RoleId).FirstOrDefault(),
+                    BooksCount = x.BooksCount,
+                    AllBooks = dbContext.Books
+                        .Where(b => b.Published < bookCutoffDate)
+                        .Where(b => b.AuthorId == x.Id)
+                        .Select(y => new BookDto
+                        {
+                            Id = y.Id,
+                            Name = y.Name,
+                            Published = y.Published,
+                            ISBN = y.ISBN,
+                            PublisherName = y.Publisher.Name
+                        }).ToList(),
+                    AuthorAge = x.Age,
+                    AuthorCountry = x.Country,
+                    AuthorNickName = x.NickName,
+                    Id = x.Id
+                });
 
-            return authors;
+            return youngSerbianAuthorQuery.ToList();
         }
     }
 }

From edd32c93a5e03f7bc107ff6d58cdf7c0bd9e1730 Mon Sep 17 00:00:00 2001
From: ralcaraz <ralcarazerhs@gmail.com>
Date: Mon, 26 Sep 2022 18:43:27 -0700
Subject: [PATCH 2/2] Added missing property in final query

---
 BenchmarkService.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/BenchmarkService.cs b/BenchmarkService.cs
index 4ed9546..7ba996b 100644
--- a/BenchmarkService.cs
+++ b/BenchmarkService.cs
@@ -119,7 +119,8 @@ public List<AuthorDTO> GetAuthors_Optimized()
                             Name = y.Name,
                             Published = y.Published,
                             ISBN = y.ISBN,
-                            PublisherName = y.Publisher.Name
+                            PublisherName = y.Publisher.Name,
+                            PublishedYear = y.Published.Year
                         }).ToList(),
                     AuthorAge = x.Age,
                     AuthorCountry = x.Country,