Follow the same style guide as Rails

.rubocop-https---raw-githubusercontent-com-rails-rails-master--rubocop-yml

@@ -0,0 +1,221 @@
+AllCops:
+  TargetRubyVersion: 2.4
+  # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
+  # to ignore them, so only the ones explicitly set in this file are enabled.
+  DisabledByDefault: true
+  Exclude:
+    - '**/templates/**/*'
+    - '**/vendor/**/*'
+    - 'actionpack/lib/action_dispatch/journey/parser.rb'
+    - 'railties/test/fixtures/tmp/**/*'
+    - 'node_modules/**/*'
+
+Performance:
+  Exclude:
+    - '**/test/**/*'
+
+Rails:
+  Enabled: true
+
+# Prefer assert_not over assert !
+Rails/AssertNot:
+  Include:
+    - '**/test/**/*'
+
+# Prefer assert_not_x over refute_x
+Rails/RefuteMethods:
+  Include:
+    - '**/test/**/*'
+
+# Prefer &&/|| over and/or.
+Style/AndOr:
+  Enabled: true
+
+# Do not use braces for hash literals when they are the last argument of a
+# method call.
+Style/BracesAroundHashParameters:
+  Enabled: true
+  EnforcedStyle: context_dependent
+
+# Align `when` with `case`.
+Layout/CaseIndentation:
+  Enabled: true
+
+# Align comments with method definitions.
+Layout/CommentIndentation:
+  Enabled: true
+
+Layout/ElseAlignment:
+  Enabled: true
+
+# Align `end` with the matching keyword or starting expression except for
+# assignments, where it should be aligned with the LHS.
+Layout/EndAlignment:
+  Enabled: true
+  EnforcedStyleAlignWith: variable
+  AutoCorrect: true
+
+Layout/EmptyLineAfterMagicComment:
+  Enabled: true
+
+Layout/EmptyLinesAroundBlockBody:
+  Enabled: true
+
+# In a regular class definition, no empty lines around the body.
+Layout/EmptyLinesAroundClassBody:
+  Enabled: true
+
+# In a regular method definition, no empty lines around the body.
+Layout/EmptyLinesAroundMethodBody:
+  Enabled: true
+
+# In a regular module definition, no empty lines around the body.
+Layout/EmptyLinesAroundModuleBody:
+  Enabled: true
+
+Layout/FirstParameterIndentation:
+  Enabled: true
+
+# Use Ruby >= 1.9 syntax for hashes. Prefer { a: :b } over { :a => :b }.
+Style/HashSyntax:
+  Enabled: true
+
+# Method definitions after `private` or `protected` isolated calls need one
+# extra level of indentation.
+Layout/IndentationConsistency:
+  Enabled: true
+  EnforcedStyle: rails
+
+# Two spaces, no tabs (for indentation).
+Layout/IndentationWidth:
+  Enabled: true
+
+Layout/LeadingCommentSpace:
+  Enabled: true
+
+Layout/SpaceAfterColon:
+  Enabled: true
+
+Layout/SpaceAfterComma:
+  Enabled: true
+
+Layout/SpaceAroundEqualsInParameterDefault:
+  Enabled: true
+
+Layout/SpaceAroundKeyword:
+  Enabled: true
+
+Layout/SpaceAroundOperators:
+  Enabled: true
+
+Layout/SpaceBeforeComma:
+    Enabled: true
+
+Layout/SpaceBeforeFirstArg:
+    Enabled: true
+
+Style/DefWithParentheses:
+  Enabled: true
+
+# Defining a method with parameters needs parentheses.
+Style/MethodDefParentheses:
+  Enabled: true
+
+Style/FrozenStringLiteralComment:
+  Enabled: true
+  EnforcedStyle: always
+  Exclude:
+    - 'actionview/test/**/*.builder'
+    - 'actionview/test/**/*.ruby'
+    - 'actionpack/test/**/*.builder'
+    - 'actionpack/test/**/*.ruby'
+    - 'activestorage/db/migrate/**/*.rb'
+
+Style/RedundantFreeze:
+  Enabled: true
+  Exclude:
+    - 'actionpack/lib/action_dispatch/journey/router/utils.rb'
+    - 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'
+
+# Use `foo {}` not `foo{}`.
+Layout/SpaceBeforeBlockBraces:
+  Enabled: true
+
+# Use `foo { bar }` not `foo {bar}`.
+Layout/SpaceInsideBlockBraces:
+  Enabled: true
+  EnforcedStyleForEmptyBraces: space
+
+# Use `{ a: 1 }` not `{a:1}`.
+Layout/SpaceInsideHashLiteralBraces:
+  Enabled: true
+
+Layout/SpaceInsideParens:
+  Enabled: true
+
+# Check quotes usage according to lint rule below.
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+# Detect hard tabs, no hard tabs.
+Layout/Tab:
+  Enabled: true
+
+# Blank lines should not have any spaces.
+Layout/TrailingBlankLines:
+  Enabled: true
+
+# No trailing whitespace.
+Layout/TrailingWhitespace:
+  Enabled: true
+
+# Use quotes for string literals when they are enough.
+Style/UnneededPercentQ:
+  Enabled: true
+
+# Use my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
+Lint/RequireParentheses:
+  Enabled: true
+
+Lint/StringConversionInInterpolation:
+  Enabled: true
+
+Lint/UriEscapeUnescape:
+  Enabled: true
+
+Style/ParenthesesAroundCondition:
+  Enabled: true
+
+Style/RedundantReturn:
+  Enabled: true
+  AllowMultipleReturnValues: true
+
+Style/Semicolon:
+  Enabled: true
+  AllowAsExpressionSeparator: true
+
+# Prefer Foo.method over Foo::method
+Style/ColonMethodCall:
+  Enabled: true
+
+Style/TrivialAccessors:
+  Enabled: true
+
+Performance/FlatMap:
+  Enabled: true
+
+Performance/RedundantMerge:
+  Enabled: true
+
+Performance/StartWith:
+  Enabled: true
+
+Performance/EndWith:
+  Enabled: true
+
+Performance/RegexpMatch:
+  Enabled: true
+
+Performance/UnfreezeString:
+  Enabled: true

.rubocop.yml

@@ -0,0 +1,5 @@
+inherit_from: https://raw.githubusercontent.com/rails/rails/master/.rubocop.yml
+
+AllCops:
+  TargetRubyVersion: 2.2
+  DisabledByDefault: true

Gemfile

@@ -1,16 +1,18 @@
-source 'https://rubygems.org'
+# frozen_string_literal: true
+
+source "https://rubygems.org"
 
 git_source(:github) { |repo| "https://github.com/#{repo}" }
 
-branch = ENV.fetch('BRANCH', 'master')
-gem 'activesupport', github: 'rails/rails', branch: branch
-gem 'activemodel', github: 'rails/rails', branch: branch
-gem 'activejob', github: 'rails/rails', branch: branch
+branch = ENV.fetch("BRANCH", "master")
+gem "activesupport", github: "rails/rails", branch: branch
+gem "activemodel", github: "rails/rails", branch: branch
+gem "activejob", github: "rails/rails", branch: branch
 
 gemspec
 
 platform :mri do
   group :test do
-    gem 'ruby-prof'
+    gem "ruby-prof"
   end
 end

Rakefile

@@ -1,27 +1,29 @@
 #!/usr/bin/env rake
-require 'rake/testtask'
-require 'bundler'
+# frozen_string_literal: true
+
+require "rake/testtask"
+require "bundler"
 Bundler::GemHelper.install_tasks
 
 desc "Default Task"
-task :default => [ :test ]
+task default: [ :test ]
 
 # Run the unit tests
 
 Rake::TestTask.new { |t|
   t.libs << "test"
-  t.pattern = 'test/**/*_test.rb'
+  t.pattern = "test/**/*_test.rb"
   t.warning = true
   t.verbose = true
 }
 
 namespace :test do
   task :isolated do
-    ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))
+    ruby = File.join(*RbConfig::CONFIG.values_at("bindir", "RUBY_INSTALL_NAME"))
     activesupport_path = "#{File.dirname(__FILE__)}/../activesupport/lib"
     Dir.glob("test/**/*_test.rb").all? do |file|
-      sh(ruby, '-w', "-Ilib:test:#{activesupport_path}", file)
-    end or raise "Failures"
+      sh(ruby, "-w", "-Ilib:test:#{activesupport_path}", file)
+    end || raise("Failures")
   end
 end
 

activeresource.gemspec

@@ -1,30 +1,32 @@
+# frozen_string_literal: true
+
 $LOAD_PATH.push File.expand_path("../lib", __FILE__)
-require 'active_resource/version'
+require "active_resource/version"
 
 Gem::Specification.new do |s|
   s.platform    = Gem::Platform::RUBY
-  s.name        = 'activeresource'
+  s.name        = "activeresource"
   s.version     = ActiveResource::VERSION::STRING
-  s.summary     = 'REST modeling framework (part of Rails).'
-  s.description = 'REST on Rails. Wrap your RESTful web app with Ruby classes and work with them like Active Record models.'
-  s.license     = 'MIT'
+  s.summary     = "REST modeling framework (part of Rails)."
+  s.description = "REST on Rails. Wrap your RESTful web app with Ruby classes and work with them like Active Record models."
+  s.license     = "MIT"
 
-  s.author      = 'David Heinemeier Hansson'
-  s.email       = '[email protected]'
-  s.homepage    = 'http://www.rubyonrails.org'
+  s.author      = "David Heinemeier Hansson"
+  s.email       = "[email protected]"
+  s.homepage    = "http://www.rubyonrails.org"
 
-  s.files = Dir['MIT-LICENSE', 'README.rdoc', 'lib/**/*']
-  s.require_path = 'lib'
+  s.files = Dir["MIT-LICENSE", "README.rdoc", "lib/**/*"]
+  s.require_path = "lib"
 
   s.extra_rdoc_files = %w( README.rdoc )
-  s.rdoc_options.concat ['--main',  'README.rdoc']
+  s.rdoc_options.concat ["--main",  "README.rdoc"]
 
-  s.required_ruby_version = '>= 2.2.2'
+  s.required_ruby_version = ">= 2.2.2"
 
-  s.add_dependency('activesupport', '>= 5.0', '< 7')
-  s.add_dependency('activemodel', '>= 5.0', '< 7')
-  s.add_dependency('activemodel-serializers-xml', '~> 1.0')
+  s.add_dependency("activesupport", ">= 5.0", "< 7")
+  s.add_dependency("activemodel", ">= 5.0", "< 7")
+  s.add_dependency("activemodel-serializers-xml", "~> 1.0")
 
-  s.add_development_dependency('rake')
-  s.add_development_dependency('mocha', '>= 0.13.0')
+  s.add_development_dependency("rake")
+  s.add_development_dependency("mocha", ">= 0.13.0")
 end