Add benchamark

benchmark/db/schema.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+ActiveRecord::Schema.define(version: 0) do
+
+  create_table(:blogs, force: true) do |t|
+    t.string :name
+  end
+
+  create_table(:posts, force: true) do |t|
+    t.string :title
+    t.integer :blog_id
+    t.integer :author_id
+    t.string :owner_type
+    t.integer :owner_id
+  end
+
+  create_table(:users, force: true) do |t|
+    t.string :name
+  end
+end
+
+class Blog < ActiveRecord::Base
+  has_many :posts
+end
+
+class Post < ActiveRecord::Base
+  belongs_to :blog
+  belongs_to :author, class_name: 'User'
+end
+
+class User < ActiveRecord::Base
+  has_many :posts, foreign_key: :author_id
+end

benchmark/main.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+$LOAD_PATH.push File.expand_path('lib', __dir__)
+
+require 'benchmark/ips'
+
+ENV['RAILS_ENV'] = 'test'
+
+require 'active_record'
+
+ActiveRecord::Base.establish_connection(
+  adapter: 'sqlite3',
+  database: ':memory:'
+)
+
+require_relative './db/schema.rb'
+
+# Setup data
+blog_1 = Blog.create!
+blog_2 = Blog.create!
+100.times do
+  user_1 = User.create!
+  user_2 = User.create!
+  Post.create!(author: user_1, blog: blog_1)
+  Post.create!(author: user_2, blog: blog_2)
+end
+
+Benchmark.ips do |x|
+  x.time = 5
+  x.warmup = 2
+
+  # Use AR's eager loading
+  x.report('AR eager loading: ') do
+    ::Blog.all.includes(posts: :author).each do |blog|
+      blog.posts.each do |post|
+        post.author.id
+      end
+    end
+  end
+
+  require 'goldiloader'
+
+  # Use goldiloader
+  x.report('AR with goldiloader: ') do
+    ::Blog.all.each do |blog|
+      blog.posts.each do |post|
+        post.author.id
+      end
+    end
+  end
+
+  x.compare!
+end

goldiloader.gemspec

@@ -28,6 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'activesupport', '>= 4.2', '< 5.3'
 
   spec.add_development_dependency 'appraisal'
+  spec.add_development_dependency 'benchmark-ips'
   spec.add_development_dependency 'coveralls'
   spec.add_development_dependency 'database_cleaner', '>= 1.2'
   spec.add_development_dependency 'mime-types'