1. Rubocop, Simplecov, Mutant, Brakeman, Reek, Rspec

   Rails_best_practices integrations
2. Git hooks to run tools post/pre commit
   bin/setup script to copy hooks and database file
3. Changed default layout
   3.1 Split main Gemfile into context-specific Gemfiles
       3.1.1 Added a test to verify that context specific gemfiles have
              gems locked at the same version as a global one
   3.2 Divided application into three parts
       - Domain logic
       - Representations
       - Oters
   3.3 Changed `application.paths` to match changed application layout
   3.4 Changed ApplicationRecord and ApplicationController to be
       concerns
       3.4.1 Configured Draper to work without ApplicationController
   3.5 Moved `database.yml` to domain logic folder
   3.6 Moved `routes.rb` to representations folder
   3.7 Added ability to run context tests in isolation
   3.8 Moved Factories definitions to domain logic folder

samples/domain_driven_rails_architecture_pattern/.gitignore

@@ -7,10 +7,6 @@
 # Ignore bundler config.
 /.bundle
 
-# Ignore the default SQLite database.
-/db/*.sqlite3
-/db/*.sqlite3-journal
-
 # Ignore all logfiles and tempfiles.
 /log/*
 /tmp/*
@@ -29,3 +25,16 @@
 
 # Ignore master key for decrypting credentials and more.
 /config/master.key
+
+# Elastic Beanstalk Files
+.elasticbeanstalk/*
+!.elasticbeanstalk/*.cfg.yml
+!.elasticbeanstalk/*.global.yml
+
+# SimpleCov
+/coverage/*
+
+# RSpec
+spec/examples.txt
+representations/spec/examples.txt
+domain/spec/examples.txt

samples/domain_driven_rails_architecture_pattern/.rspec

@@ -0,0 +1 @@
+--require spec_helper

samples/domain_driven_rails_architecture_pattern/.rubocop.yml

@@ -0,0 +1,89 @@
+inherit_from: .rubocop_todo.yml
+
+Metrics/LineLength:
+  Max: 120
+
+AllCops:
+  Exclude:
+    - 'vendor/**/*'
+    - 'spec/fixtures/**/*'
+    - 'tmp/**/*'
+  TargetRubyVersion: 2.5
+
+Naming/PredicateName:
+  # Method define macros for dynamically generated method.
+  MethodDefinitionMacros:
+    - define_method
+    - define_singleton_method
+    - def_node_matcher
+    - def_node_search
+
+Style/FrozenStringLiteralComment:
+  EnforcedStyle: always
+
+Style/FormatStringToken:
+  # Because we parse a lot of source codes from strings. Percent arrays
+  # look like unannotated format string tokens to this cop.
+  Exclude:
+    - spec/**/*
+
+Layout/EndOfLine:
+  EnforcedStyle: lf
+
+Layout/ClassStructure:
+  Enabled: true
+  Categories:
+    module_inclusion:
+      - include
+      - prepend
+      - extend
+  ExpectedOrder:
+      - module_inclusion
+      - constants
+      - public_class_methods
+      - initializer
+      - instance_methods
+      - protected_methods
+      - private_methods
+
+Layout/IndentHeredoc:
+  EnforcedStyle: powerpack
+
+# Trailing white space is meaningful in code examples
+Layout/TrailingWhitespace:
+  AllowInHeredoc: true
+
+Lint/AmbiguousBlockAssociation:
+  Exclude:
+    - 'spec/**/*.rb'
+
+Lint/InterpolationCheck:
+  Exclude:
+    - 'spec/**/*.rb'
+
+Lint/UselessAccessModifier:
+  MethodCreatingMethods:
+    - 'def_matcher'
+    - 'def_node_matcher'
+
+Metrics/BlockLength:
+  Exclude:
+    - 'Rakefile'
+    - '**/*.rake'
+    - 'spec/**/*.rb'
+
+Metrics/ModuleLength:
+  Exclude:
+    - 'spec/**/*.rb'
+
+Layout/SpaceInsideParens:
+  Enabled: false
+
+Layout/SpaceInsideReferenceBrackets:
+  Enabled: false
+
+Layout/SpaceInsideStringInterpolation:
+  Enabled: false
+
+Layout/SpaceInsidePercentLiteralDelimiters:
+  Enabled: false

samples/domain_driven_rails_architecture_pattern/.rubocop_todo.yml

@@ -0,0 +1,7 @@
+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2018-10-12 06:49:56 +0300 using RuboCop version 0.59.2.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.

samples/domain_driven_rails_architecture_pattern/Gemfile

@@ -1,62 +1,71 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 ruby '2.5.1'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.2.1'
-# Use sqlite3 as the database for Active Record
-gem 'sqlite3'
-# Use Puma as the app server
-gem 'puma', '~> 3.11'
+# Use postgresql as the database for Active Record
+# gem 'pg', '>= 0.18', '< 2.0'
 # Use SCSS for stylesheets
-gem 'sass-rails', '~> 5.0'
-# Use Uglifier as compressor for JavaScript assets
-gem 'uglifier', '>= 1.3.0'
-# See https://github.com/rails/execjs#readme for more supported runtimes
-# gem 'mini_racer', platforms: :ruby
-
-# Use CoffeeScript for .coffee assets and views
-gem 'coffee-rails', '~> 4.2'
-# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
-gem 'turbolinks', '~> 5'
+# gem 'sass-rails'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
-gem 'jbuilder', '~> 2.5'
-# Use Redis adapter to run Action Cable in production
-# gem 'redis', '~> 4.0'
+# gem 'jbuilder'
 # Use ActiveModel has_secure_password
 # gem 'bcrypt', '~> 3.1.7'
 
-# Use ActiveStorage variant
-# gem 'mini_magick', '~> 4.8'
-
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
 
 # Reduces boot times through caching; required in config/boot.rb
-gem 'bootsnap', '>= 1.1.0', require: false
+# gem 'bootsnap', require: false
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
-  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
+  # gem 'byebug', platforms: %i[mri mingw x64_mingw]
 end
 
 group :development do
   # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
-  gem 'web-console', '>= 3.3.0'
-  gem 'listen', '>= 3.0.5', '< 3.2'
-  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
-  gem 'spring'
-  gem 'spring-watcher-listen', '~> 2.0.0'
+  # gem 'web-console'
 end
 
 group :test do
   # Adds support for Capybara system testing and selenium driver
-  gem 'capybara', '>= 2.15'
-  gem 'selenium-webdriver'
+  gem 'capybara'
+  # gem 'selenium-webdriver'
   # Easy installation and use of chromedriver to run system tests with Chrome
-  gem 'chromedriver-helper'
+  # gem 'chromedriver-helper'
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
-gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+gem 'tzinfo-data', platforms: %i[mingw mswin x64_mingw jruby]
+
+########################################################################
+#                                                                      #
+#                                                                      #
+#                         Custom Gems                                  #
+#                                                                      #
+#                                                                      #
+########################################################################
+
+%w[ representations/Gemfile domain/Gemfile ].each do |custom_gemfile|
+  eval_gemfile custom_gemfile
+end
+
+group :development do
+  gem 'brakeman'
+  gem 'rails_best_practices'
+  gem 'reek'
+  gem 'rubocop', require: false
+  gem 'rubocop-git'
+end
+
+group :development, :test do
+  gem 'mutant-rspec'
+  gem 'pry-byebug'
+  gem 'rspec-rails'
+  gem 'simplecov'
+end