15 files changed, 160 insertions, 160 deletions

diff --git a/guides/Rakefile b/guides/Rakefile
index 00577377d7..ced8131f82 100644
--- a/guides/Rakefile
+++ b/guides/Rakefile
@@ -1,7 +1,7 @@
 namespace :guides do
 
   desc 'Generate guides (for authors), use ONLY=foo to process just "foo.md"'
-  task :generate => 'generate:html'
+  task :generate => "generate:html"
 
   namespace :generate do
 
@@ -19,8 +19,8 @@ namespace :guides do
       unless `convert` =~ /convert/  
         abort "Please install ImageMagick`"
       end
-      ENV['KINDLE'] = '1'
-      Rake::Task['guides:generate:html'].invoke
+      ENV["KINDLE"] = "1"
+      Rake::Task["guides:generate:html"].invoke
     end
   end
 
@@ -76,4 +76,4 @@ Examples:
   end
 end
 
-task :default => 'guides:help'
+task :default => "guides:help"
diff --git a/guides/bug_report_templates/action_controller_gem.rb b/guides/bug_report_templates/action_controller_gem.rb
index e22c9327a4..960d269d90 100644
--- a/guides/bug_report_templates/action_controller_gem.rb
+++ b/guides/bug_report_templates/action_controller_gem.rb
@@ -1,30 +1,30 @@
 begin
-  require 'bundler/inline'
+  require "bundler/inline"
 rescue LoadError => e
-  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
   raise e
 end
 
 gemfile(true) do
-  source 'https://rubygems.org'
+  source "https://rubygems.org"
   # Activate the gem you are reporting the issue against.
-  gem 'rails', '5.0.0'
+  gem "rails", "5.0.0"
 end
 
-require 'rack/test'
-require 'action_controller/railtie'
+require "rack/test"
+require "action_controller/railtie"
 
 class TestApp < Rails::Application
   config.root = File.dirname(__FILE__)
-  config.session_store :cookie_store, key: 'cookie_store_key'
-  secrets.secret_token    = 'secret_token'
-  secrets.secret_key_base = 'secret_key_base'
+  config.session_store :cookie_store, key: "cookie_store_key"
+  secrets.secret_token    = "secret_token"
+  secrets.secret_key_base = "secret_key_base"
 
   config.logger = Logger.new($stdout)
   Rails.logger  = config.logger
 
   routes.draw do
-    get '/' => 'test#index'
+    get "/" => "test#index"
   end
 end
 
@@ -32,11 +32,11 @@ class TestController < ActionController::Base
   include Rails.application.routes.url_helpers
 
   def index
-    render plain: 'Home'
+    render plain: "Home"
   end
 end
 
-require 'minitest/autorun'
+require "minitest/autorun"
 
 # Ensure backward compatibility with Minitest 4
 Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)
@@ -45,7 +45,7 @@ class BugTest < Minitest::Test
   include Rack::Test::Methods
 
   def test_returns_success
-    get '/'
+    get "/"
     assert last_response.ok?
   end
 
diff --git a/guides/bug_report_templates/action_controller_master.rb b/guides/bug_report_templates/action_controller_master.rb
index 8322707495..cd0a3be85c 100644
--- a/guides/bug_report_templates/action_controller_master.rb
+++ b/guides/bug_report_templates/action_controller_master.rb
@@ -1,28 +1,28 @@
 begin
-  require 'bundler/inline'
+  require "bundler/inline"
 rescue LoadError => e
-  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
   raise e
 end
 
 gemfile(true) do
-  source 'https://rubygems.org'
-  gem 'rails', github: 'rails/rails'
+  source "https://rubygems.org"
+  gem "rails", github: "rails/rails"
 end
 
-require 'action_controller/railtie'
+require "action_controller/railtie"
 
 class TestApp < Rails::Application
   config.root = File.dirname(__FILE__)
-  config.session_store :cookie_store, key: 'cookie_store_key'
-  secrets.secret_token    = 'secret_token'
-  secrets.secret_key_base = 'secret_key_base'
+  config.session_store :cookie_store, key: "cookie_store_key"
+  secrets.secret_token    = "secret_token"
+  secrets.secret_key_base = "secret_key_base"
 
   config.logger = Logger.new($stdout)
   Rails.logger  = config.logger
 
   routes.draw do
-    get '/' => 'test#index'
+    get "/" => "test#index"
   end
 end
 
@@ -30,18 +30,18 @@ class TestController < ActionController::Base
   include Rails.application.routes.url_helpers
 
   def index
-    render plain: 'Home'
+    render plain: "Home"
   end
 end
 
-require 'minitest/autorun'
-require 'rack/test'
+require "minitest/autorun"
+require "rack/test"
 
 class BugTest < Minitest::Test
   include Rack::Test::Methods
 
   def test_returns_success
-    get '/'
+    get "/"
     assert last_response.ok?
   end
 
diff --git a/guides/bug_report_templates/active_record_gem.rb b/guides/bug_report_templates/active_record_gem.rb
index 46fd2f1aae..e18302fe65 100644
--- a/guides/bug_report_templates/active_record_gem.rb
+++ b/guides/bug_report_templates/active_record_gem.rb
@@ -1,26 +1,26 @@
 begin
-  require 'bundler/inline'
+  require "bundler/inline"
 rescue LoadError => e
-  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
   raise e
 end
 
 gemfile(true) do
-  source 'https://rubygems.org'
+  source "https://rubygems.org"
   # Activate the gem you are reporting the issue against.
-  gem 'activerecord', '5.0.0'
-  gem 'sqlite3'
+  gem "activerecord", "5.0.0"
+  gem "sqlite3"
 end
 
-require 'active_record'
-require 'minitest/autorun'
-require 'logger'
+require "active_record"
+require "minitest/autorun"
+require "logger"
 
 # Ensure backward compatibility with Minitest 4
 Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)
 
 # This connection will do for database-independent bug reports.
-ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
+ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
 ActiveRecord::Base.logger = Logger.new(STDOUT)
 
 ActiveRecord::Schema.define do
diff --git a/guides/bug_report_templates/active_record_master.rb b/guides/bug_report_templates/active_record_master.rb
index 6fd401bd50..7265a671b0 100644
--- a/guides/bug_report_templates/active_record_master.rb
+++ b/guides/bug_report_templates/active_record_master.rb
@@ -1,22 +1,22 @@
 begin
-  require 'bundler/inline'
+  require "bundler/inline"
 rescue LoadError => e
-  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
   raise e
 end
 
 gemfile(true) do
-  source 'https://rubygems.org'
-  gem 'rails', github: 'rails/rails'
-  gem 'sqlite3'
+  source "https://rubygems.org"
+  gem "rails", github: "rails/rails"
+  gem "sqlite3"
 end
 
-require 'active_record'
-require 'minitest/autorun'
-require 'logger'
+require "active_record"
+require "minitest/autorun"
+require "logger"
 
 # This connection will do for database-independent bug reports.
-ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
+ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
 ActiveRecord::Base.logger = Logger.new(STDOUT)
 
 ActiveRecord::Schema.define do
diff --git a/guides/bug_report_templates/generic_gem.rb b/guides/bug_report_templates/generic_gem.rb
index 2aaaf10615..a94848e25b 100644
--- a/guides/bug_report_templates/generic_gem.rb
+++ b/guides/bug_report_templates/generic_gem.rb
@@ -1,18 +1,18 @@
 begin
-  require 'bundler/inline'
+  require "bundler/inline"
 rescue LoadError => e
-  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
   raise e
 end
 
 gemfile(true) do
-  source 'https://rubygems.org'
+  source "https://rubygems.org"
   # Activate the gem you are reporting the issue against.
-  gem 'activesupport', '5.0.0'
+  gem "activesupport", "5.0.0"
 end
 
-require 'active_support/core_ext/object/blank'
-require 'minitest/autorun'
+require "active_support/core_ext/object/blank"
+require "minitest/autorun"
 
 # Ensure backward compatibility with Minitest 4
 Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)
diff --git a/guides/bug_report_templates/generic_master.rb b/guides/bug_report_templates/generic_master.rb
index 70cf931f34..d3a7ae4ac4 100644
--- a/guides/bug_report_templates/generic_master.rb
+++ b/guides/bug_report_templates/generic_master.rb
@@ -1,18 +1,18 @@
 begin
-  require 'bundler/inline'
+  require "bundler/inline"
 rescue LoadError => e
-  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
   raise e
 end
 
 gemfile(true) do
-  source 'https://rubygems.org'
-  gem 'rails', github: 'rails/rails'
+  source "https://rubygems.org"
+  gem "rails", github: "rails/rails"
 end
 
-require 'active_support'
-require 'active_support/core_ext/object/blank'
-require 'minitest/autorun'
+require "active_support"
+require "active_support/core_ext/object/blank"
+require "minitest/autorun"
 
 class BugTest < Minitest::Test
   def test_stuff
diff --git a/guides/rails_guides.rb b/guides/rails_guides.rb
index 367ed0b12e..557d23f78c 100644
--- a/guides/rails_guides.rb
+++ b/guides/rails_guides.rb
@@ -10,7 +10,7 @@ begin
   $:.unshift ap_lib if File.directory?(ap_lib)
 rescue LoadError
   # Guides generation from gems.
-  gem "actionpack", '>= 3.0'
+  gem "actionpack", ">= 3.0"
 end
 
 require "rails_guides/generator"
diff --git a/guides/rails_guides/generator.rb b/guides/rails_guides/generator.rb
index 48ac90fca4..fdd525a594 100644
--- a/guides/rails_guides/generator.rb
+++ b/guides/rails_guides/generator.rb
@@ -49,18 +49,18 @@
 #
 # ---------------------------------------------------------------------------
 
-require 'set'
-require 'fileutils'
+require "set"
+require "fileutils"
 
-require 'active_support/core_ext/string/output_safety'
-require 'active_support/core_ext/object/blank'
-require 'action_controller'
-require 'action_view'
+require "active_support/core_ext/string/output_safety"
+require "active_support/core_ext/object/blank"
+require "action_controller"
+require "action_view"
 
-require 'rails_guides/markdown'
-require 'rails_guides/indexer'
-require 'rails_guides/helpers'
-require 'rails_guides/levenshtein'
+require "rails_guides/markdown"
+require "rails_guides/indexer"
+require "rails_guides/helpers"
+require "rails_guides/levenshtein"
 
 module RailsGuides
   class Generator
@@ -81,12 +81,12 @@ module RailsGuides
     end
 
     def set_flags_from_environment
-      @edge     = ENV['EDGE']     == '1'
-      @warnings = ENV['WARNINGS'] == '1'
-      @all      = ENV['ALL']      == '1'
-      @kindle   = ENV['KINDLE']   == '1'
-      @version  = ENV['RAILS_VERSION'] || 'local'
-      @lang     = ENV['GUIDES_LANGUAGE']
+      @edge     = ENV["EDGE"]     == "1"
+      @warnings = ENV["WARNINGS"] == "1"
+      @all      = ENV["ALL"]      == "1"
+      @kindle   = ENV["KINDLE"]   == "1"
+      @version  = ENV["RAILS_VERSION"] || "local"
+      @lang     = ENV["GUIDES_LANGUAGE"]
     end
 
     def register_kindle_mime_types
@@ -113,18 +113,18 @@ module RailsGuides
     end
 
     def generate_mobi
-      require 'rails_guides/kindle'
+      require "rails_guides/kindle"
       out = "#{output_dir}/kindlegen.out"
       Kindle.generate(output_dir, mobi, out)
       puts "(kindlegen log at #{out})."
     end
 
     def mobi
-      "ruby_on_rails_guides_#@version%s.mobi" % (@lang.present? ? ".#@lang" : '')
+      "ruby_on_rails_guides_#@version%s.mobi" % (@lang.present? ? ".#@lang" : "")
     end
 
     def initialize_dirs(output)
-      @guides_dir = File.join(File.dirname(__FILE__), '..')
+      @guides_dir = File.join(File.dirname(__FILE__), "..")
       @source_dir = "#@guides_dir/source/#@lang"
       @output_dir = if output
         output
@@ -132,7 +132,7 @@ module RailsGuides
         "#@guides_dir/output/kindle/#@lang"
       else
         "#@guides_dir/output/#@lang"
-      end.sub(%r</$>, '')
+      end.sub(%r</$>, "")
     end
 
     def create_output_dir_if_needed
@@ -151,18 +151,18 @@ module RailsGuides
 
       if kindle?
         Dir.entries("#{source_dir}/kindle").grep(GUIDES_RE).map do |entry|
-          next if entry == 'KINDLE.md'
+          next if entry == "KINDLE.md"
           guides << "kindle/#{entry}"
         end
       end
 
-      ENV.key?('ONLY') ? select_only(guides) : guides
+      ENV.key?("ONLY") ? select_only(guides) : guides
     end
 
     def select_only(guides)
-      prefixes = ENV['ONLY'].split(",").map(&:strip)
+      prefixes = ENV["ONLY"].split(",").map(&:strip)
       guides.select do |guide|
-        guide.start_with?('kindle'.freeze, *prefixes)
+        guide.start_with?("kindle".freeze, *prefixes)
       end
     end
 
@@ -171,10 +171,10 @@ module RailsGuides
     end
 
     def output_file_for(guide)
-      if guide.end_with?('.md')
-        guide.sub(/md\z/, 'html')
+      if guide.end_with?(".md")
+        guide.sub(/md\z/, "html")
       else
-        guide.sub(/\.erb\z/, '')
+        guide.sub(/\.erb\z/, "")
       end
     end
 
@@ -191,9 +191,9 @@ module RailsGuides
     def generate_guide(guide, output_file)
       output_path = output_path_for(output_file)
       puts "Generating #{guide} as #{output_file}"
-      layout = kindle? ? 'kindle/layout' : 'layout'
+      layout = kindle? ? "kindle/layout" : "layout"
 
-      File.open(output_path, 'w') do |f|
+      File.open(output_path, "w") do |f|
         view = ActionView::Base.new(source_dir, :edge => @edge, :version => @version, :mobi => "kindle/#{mobi}", :lang => @lang)
         view.extend(Helpers)
 
@@ -236,7 +236,7 @@ module RailsGuides
 
     def check_fragment_identifiers(html, anchors)
       html.scan(/<a\s+href="#([^"]+)/).flatten.each do |fragment_identifier|
-        next if fragment_identifier == 'mainCol' # in layout, jumps to some DIV
+        next if fragment_identifier == "mainCol" # in layout, jumps to some DIV
         unless anchors.member?(fragment_identifier)
           guess = anchors.min { |a, b|
             Levenshtein.distance(fragment_identifier, a) <=> Levenshtein.distance(fragment_identifier, b)
diff --git a/guides/rails_guides/helpers.rb b/guides/rails_guides/helpers.rb
index 5bf73da16c..4dd7bf4def 100644
--- a/guides/rails_guides/helpers.rb
+++ b/guides/rails_guides/helpers.rb
@@ -1,4 +1,4 @@
-require 'yaml'
+require "yaml"
 
 module RailsGuides
   module Helpers
@@ -7,7 +7,7 @@ module RailsGuides
       result = content_tag(:dt, link)
 
       if options[:work_in_progress]
-        result << content_tag(:dd, 'Work in progress', :class => 'work-in-progress')
+        result << content_tag(:dd, "Work in progress", :class => "work-in-progress")
       end
 
       result << content_tag(:dd, capture(&block))
@@ -19,30 +19,30 @@ module RailsGuides
     end
 
     def documents_flat
-      documents_by_section.flat_map {|section| section['documents']}
+      documents_by_section.flat_map {|section| section["documents"]}
     end
 
     def finished_documents(documents)
-      documents.reject { |document| document['work_in_progress'] }
+      documents.reject { |document| document["work_in_progress"] }
     end
 
     def docs_for_menu(position=nil)
       if position.nil?
         documents_by_section
-      elsif position == 'L'
+      elsif position == "L"
         documents_by_section.to(3)
       else
         documents_by_section.from(4)
       end
     end
 
-    def author(name, nick, image = 'credits_pic_blank.gif', &block)
+    def author(name, nick, image = "credits_pic_blank.gif", &block)
       image = "images/#{image}"
 
-      result = tag(:img, :src => image, :class => 'left pic', :alt => name, :width => 91, :height => 91)
+      result = tag(:img, :src => image, :class => "left pic", :alt => name, :width => 91, :height => 91)
       result << content_tag(:h3, name)
       result << content_tag(:p, capture(&block))
-      content_tag(:div, result, :class => 'clearfix', :id => nick)
+      content_tag(:div, result, :class => "clearfix", :id => nick)
     end
 
     def code(&block)
diff --git a/guides/rails_guides/indexer.rb b/guides/rails_guides/indexer.rb
index 89fbccbb1d..be1c3fab80 100644
--- a/guides/rails_guides/indexer.rb
+++ b/guides/rails_guides/indexer.rb
@@ -1,5 +1,5 @@
-require 'active_support/core_ext/object/blank'
-require 'active_support/core_ext/string/inflections'
+require "active_support/core_ext/object/blank"
+require "active_support/core_ext/string/inflections"
 
 module RailsGuides
   class Indexer
@@ -34,7 +34,7 @@ module RailsGuides
             return level_hash
           elsif level == current_level
             index = counters.join(".")
-            idx ||= '#' + title_to_idx(title)
+            idx ||= "#" + title_to_idx(title)
 
             raise "Parsing Fail" unless @result.sub!(matched, "h#{level}(#{idx}). #{index} #{title}")
 
@@ -58,7 +58,7 @@ module RailsGuides
     end
 
     def title_to_idx(title)
-      idx = title.strip.parameterize.sub(/^\d+/, '')
+      idx = title.strip.parameterize.sub(/^\d+/, "")
       if warnings && idx.blank?
         puts "BLANK ID: please put an explicit ID for section #{title}, as in h5(#my-id)"
       end
diff --git a/guides/rails_guides/kindle.rb b/guides/rails_guides/kindle.rb
index 081afcb09f..3686e195e0 100644
--- a/guides/rails_guides/kindle.rb
+++ b/guides/rails_guides/kindle.rb
@@ -4,10 +4,10 @@ unless `which kindlerb`
   abort "Please gem install kindlerb"
 end
 
-require 'nokogiri'
-require 'fileutils'
-require 'yaml'
-require 'date'
+require "nokogiri"
+require "fileutils"
+require "yaml"
+require "date"
 
 module Kindle
   extend self
@@ -18,7 +18,7 @@ module Kindle
       puts "=> Using output dir: #{output_dir}"
       puts "=> Arranging html pages in document order"
       toc = File.read("toc.ncx")
-      doc = Nokogiri::XML(toc).xpath("//ncx:content", 'ncx' => "http://www.daisy.org/z3986/2005/ncx/")
+      doc = Nokogiri::XML(toc).xpath("//ncx:content", "ncx" => "http://www.daisy.org/z3986/2005/ncx/")
       html_pages = doc.select {|c| c[:src]}.map {|c| c[:src]}.uniq
      
       generate_front_matter(html_pages)
@@ -49,14 +49,14 @@ module Kindle
 
     fdoc = Nokogiri::HTML(html)
     fdoc.search("h3").each do |h3|
-      h3.name = 'h4'
+      h3.name = "h4"
     end
     fdoc.search("h2").each do |h2| 
-      h2.name = 'h3'
-      h2['id'] = h2.inner_text.gsub(/\s/, '-')
+      h2.name = "h3"
+      h2["id"] = h2.inner_text.gsub(/\s/, "-")
     end
     add_head_section fdoc, "Front Matter"
-    File.open("frontmatter.html",'w') {|f| f.puts fdoc.to_html}
+    File.open("frontmatter.html","w") {|f| f.puts fdoc.to_html}
     html_pages.unshift "frontmatter.html"
   end
 
@@ -65,9 +65,9 @@ module Kindle
     html_pages.each_with_index do |page, section_idx|
       FileUtils::mkdir_p("sections/%03d" % section_idx)
       doc = Nokogiri::HTML(File.open(page))
-      title = doc.at("title").inner_text.gsub("Ruby on Rails Guides: ", '')
-      title = page.capitalize.gsub('.html', '') if title.strip == ''
-      File.open("sections/%03d/_section.txt" % section_idx, 'w') {|f| f.puts title}
+      title = doc.at("title").inner_text.gsub("Ruby on Rails Guides: ", "")
+      title = page.capitalize.gsub(".html", "") if title.strip == ""
+      File.open("sections/%03d/_section.txt" % section_idx, "w") {|f| f.puts title}
       doc.xpath("//h3[@id]").each_with_index do |h3,item_idx|
         subsection = h3.inner_text
         content = h3.xpath("./following-sibling::*").take_while {|x| x.name != "h3"}.map(&:to_html)
@@ -75,10 +75,10 @@ module Kindle
         item_path = "sections/%03d/%03d.html" % [section_idx, item_idx] 
         add_head_section(item, subsection)
         item.search("img").each do |img|
-          img['src'] = "#{Dir.pwd}/#{img['src']}"
+          img["src"] = "#{Dir.pwd}/#{img['src']}"
         end
         item.xpath("//li/p").each {|p| p.swap(p.children); p.remove}
-        File.open(item_path, 'w') {|f| f.puts item.to_html}
+        File.open(item_path, "w") {|f| f.puts item.to_html}
       end
     end
   end
@@ -87,21 +87,21 @@ module Kindle
     puts "=> Generating _document.yml"
     x = Nokogiri::XML(File.open("rails_guides.opf")).remove_namespaces!
     cover_jpg = "#{Dir.pwd}/images/rails_guides_kindle_cover.jpg"
-    cover_gif = cover_jpg.sub(/jpg$/, 'gif')
+    cover_gif = cover_jpg.sub(/jpg$/, "gif")
     puts `convert #{cover_jpg} #{cover_gif}`
     document = {
-      'doc_uuid' => x.at("package")['unique-identifier'],
-      'title' => x.at("title").inner_text.gsub(/\(.*$/, " v2"),
-      'publisher' => x.at("publisher").inner_text,
-      'author' => x.at("creator").inner_text,
-      'subject' => x.at("subject").inner_text,
-      'date' => x.at("date").inner_text,
-      'cover' => cover_gif,
-      'masthead' => nil,
-      'mobi_outfile' => mobi_outfile
+      "doc_uuid" => x.at("package")["unique-identifier"],
+      "title" => x.at("title").inner_text.gsub(/\(.*$/, " v2"),
+      "publisher" => x.at("publisher").inner_text,
+      "author" => x.at("creator").inner_text,
+      "subject" => x.at("subject").inner_text,
+      "date" => x.at("date").inner_text,
+      "cover" => cover_gif,
+      "masthead" => nil,
+      "mobi_outfile" => mobi_outfile
     }
     puts document.to_yaml
-    File.open("_document.yml", 'w'){|f| f.puts document.to_yaml}
+    File.open("_document.yml", "w"){|f| f.puts document.to_yaml}
   end
 
   def add_head_section(doc, title)
@@ -110,9 +110,9 @@ module Kindle
     title_node.content = title
     title_node.parent = head
     css = Nokogiri::XML::Node.new "link", doc
-    css['rel'] = 'stylesheet'
-    css['type'] = 'text/css'
-    css['href'] = "#{Dir.pwd}/stylesheets/kindle.css"
+    css["rel"] = "stylesheet"
+    css["type"] = "text/css"
+    css["href"] = "#{Dir.pwd}/stylesheets/kindle.css"
     css.parent = head
     doc.at("body").before head
   end
diff --git a/guides/rails_guides/markdown.rb b/guides/rails_guides/markdown.rb
index 69c7cd5136..6c44353b3b 100644
--- a/guides/rails_guides/markdown.rb
+++ b/guides/rails_guides/markdown.rb
@@ -1,6 +1,6 @@
-require 'redcarpet'
-require 'nokogiri'
-require 'rails_guides/markdown/renderer'
+require "redcarpet"
+require "nokogiri"
+require "rails_guides/markdown/renderer"
 
 module RailsGuides
   class Markdown
@@ -8,7 +8,7 @@ module RailsGuides
       @view = view
       @layout = layout
       @index_counter = Hash.new(0)
-      @raw_header = ''
+      @raw_header = ""
       @node_ids = {}
     end
 
@@ -47,10 +47,10 @@ module RailsGuides
       def dom_id_text(text)
         escaped_chars = Regexp.escape('\\/`*_{}[]()#+-.!:,;|&<>^~=\'"')
 
-        text.downcase.gsub(/\?/, '-questionmark')
-                     .gsub(/!/, '-bang')
-                     .gsub(/[#{escaped_chars}]+/, ' ').strip
-                     .gsub(/\s+/, '-')
+        text.downcase.gsub(/\?/, "-questionmark")
+                     .gsub(/!/, "-bang")
+                     .gsub(/[#{escaped_chars}]+/, " ").strip
+                     .gsub(/\s+/, "-")
       end
 
       def engine
@@ -87,15 +87,15 @@ module RailsGuides
             doc.children.each do |node|
               if node.name =~ /^h[3-6]$/
                 case node.name
-                when 'h3'
+                when "h3"
                   hierarchy = [node]
                   @headings_for_index << [1, node, node.inner_html]
-                when 'h4'
+                when "h4"
                   hierarchy = hierarchy[0, 1] + [node]
                   @headings_for_index << [2, node, node.inner_html]
-                when 'h5'
+                when "h5"
                   hierarchy = hierarchy[0, 2] + [node]
-                when 'h6'
+                when "h6"
                   hierarchy = hierarchy[0, 3] + [node]
                 end
 
@@ -109,7 +109,7 @@ module RailsGuides
 
       def generate_index
         if @headings_for_index.present?
-          raw_index = ''
+          raw_index = ""
           @headings_for_index.each do |level, node, label|
             if level == 1
               raw_index += "1. [#{label}](##{node[:id]})\n"
@@ -119,7 +119,7 @@ module RailsGuides
           end
 
           @index = Nokogiri::HTML.fragment(engine.render(raw_index)).tap do |doc|
-            doc.at('ol')[:class] = 'chapters'
+            doc.at("ol")[:class] = "chapters"
           end.to_html
 
           @index = <<-INDEX.html_safe
diff --git a/guides/rails_guides/markdown/renderer.rb b/guides/rails_guides/markdown/renderer.rb
index 73ca600361..ec858460e8 100644
--- a/guides/rails_guides/markdown/renderer.rb
+++ b/guides/rails_guides/markdown/renderer.rb
@@ -25,7 +25,7 @@ HTML
       def paragraph(text)
         if text =~ /^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO|TODO)[.:]/
           convert_notes(text)
-        elsif text.include?('DO NOT READ THIS FILE ON GITHUB')
+        elsif text.include?("DO NOT READ THIS FILE ON GITHUB")
         elsif text =~ /^\[<sup>(\d+)\]:<\/sup> (.+)$/
           linkback = %(<a href="#footnote-#{$1}-ref"><sup>#{$1}</sup></a>)
           %(<p class="footnote" id="footnote-#{$1}">#{linkback} #{$2}</p>)
@@ -46,14 +46,14 @@ HTML
 
         def brush_for(code_type)
           case code_type
-            when 'ruby', 'sql', 'plain'
+            when "ruby", "sql", "plain"
               code_type
-            when 'erb', 'html+erb'
-              'ruby; html-script: true'
-            when 'html'
-              'xml' # HTML is understood, but there are .xml rules in the CSS
+            when "erb", "html+erb"
+              "ruby; html-script: true"
+            when "html"
+              "xml" # HTML is understood, but there are .xml rules in the CSS
             else
-              'plain'
+              "plain"
           end
         end
 
@@ -68,10 +68,10 @@ HTML
           # asterisk.
           body.gsub(/^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO|TODO)[.:](.*?)(\n(?=\n)|\Z)/m) do
             css_class = case $1
-                        when 'CAUTION', 'IMPORTANT'
-                          'warning'
-                        when 'TIP'
-                          'info'
+                        when "CAUTION", "IMPORTANT"
+                          "warning"
+                        when "TIP"
+                          "info"
                         else
                           $1.downcase
                         end
diff --git a/guides/w3c_validator.rb b/guides/w3c_validator.rb
index e3bb964a60..6eddd08906 100644
--- a/guides/w3c_validator.rb
+++ b/guides/w3c_validator.rb
@@ -26,7 +26,7 @@
 #
 # ---------------------------------------------------------------------------
 
-require 'w3c_validators'
+require "w3c_validators"
 include W3CValidators
 
 module RailsGuides
@@ -62,11 +62,11 @@ module RailsGuides
       guides.delete("./output/layout.html")
       guides.delete("./output/_license.html")
       guides.delete("./output/_welcome.html")
-      ENV.key?('ONLY') ? select_only(guides) : guides
+      ENV.key?("ONLY") ? select_only(guides) : guides
     end
 
     def select_only(guides)
-      prefixes = ENV['ONLY'].split(",").map(&:strip)
+      prefixes = ENV["ONLY"].split(",").map(&:strip)
       guides.select do |guide|
         prefixes.any? {|p| guide.start_with?("./output/#{p}")}
       end