The application builder allows you to override elements of the application generator without being forced to reverse the operations of the default generator.

This allows you to override entire operations, like the creation of the Gemfile, README, or JavaScript files, without needing to know exactly what those operations do so you can create another template action.

Methods
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Instance Public methods
app()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 56
def app
  directory 'app'

  keep_file  'app/assets/images'
  empty_directory_with_keep_file 'app/assets/javascripts/channels' unless options[:skip_action_cable]

  keep_file  'app/controllers/concerns'
  keep_file  'app/models/concerns'
end
bin()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 66
def bin
  directory "bin" do |content|
    "#{shebang}\n" + content
  end
  chmod "bin", 0755 & ~File.umask, verbose: false
end
config()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 73
def config
  empty_directory "config"

  inside "config" do
    template "routes.rb"
    template "application.rb"
    template "environment.rb"
    template "secrets.yml"
    template "cable.yml" unless options[:skip_action_cable]
    template "puma.rb"   unless options[:skip_puma]
    template "spring.rb" if spring_install?

    directory "environments"
    directory "initializers"
    directory "locales"
  end
end
config_when_updating()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 91
def config_when_updating
  cookie_serializer_config_exist = File.exist?('config/initializers/cookies_serializer.rb')
  action_cable_config_exist = File.exist?('config/cable.yml')
  rack_cors_config_exist = File.exist?('config/initializers/cors.rb')

  config

  gsub_file 'config/environments/development.rb', /^(\s+)config\.file_watcher/, '\1# config.file_watcher'

  unless cookie_serializer_config_exist
    gsub_file 'config/initializers/cookies_serializer.rb', /json(?!,)/, 'marshal'
  end

  unless action_cable_config_exist
    template 'config/cable.yml'
  end

  unless rack_cors_config_exist
    remove_file 'config/initializers/cors.rb'
  end
end
configru()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 48
def configru
  template "config.ru"
end
database_yml()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 113
def database_yml
  template "config/databases/#{options[:database]}.yml", "config/database.yml"
end
db()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 117
def db
  directory "db"
end
gemfile()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 44
def gemfile
  template "Gemfile"
end
gitignore()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 52
def gitignore
  template "gitignore", ".gitignore"
end
lib()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 121
def lib
  empty_directory 'lib'
  empty_directory_with_keep_file 'lib/tasks'
  empty_directory_with_keep_file 'lib/assets'
end
log()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 127
def log
  empty_directory_with_keep_file 'log'
end
public_directory()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 131
def public_directory
  directory "public", "public", recursive: false
end
rakefile()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 36
def rakefile
  template "Rakefile"
end
readme()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 40
def readme
  copy_file "README.md", "README.md"
end
test()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 135
def test
  empty_directory_with_keep_file 'test/fixtures'
  empty_directory_with_keep_file 'test/fixtures/files'
  empty_directory_with_keep_file 'test/controllers'
  empty_directory_with_keep_file 'test/mailers'
  empty_directory_with_keep_file 'test/models'
  empty_directory_with_keep_file 'test/helpers'
  empty_directory_with_keep_file 'test/integration'

  template 'test/test_helper.rb'
end
tmp()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 147
def tmp
  empty_directory_with_keep_file "tmp"
  empty_directory "tmp/cache"
  empty_directory "tmp/cache/assets"
end
vendor()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 153
def vendor
  vendor_javascripts
  vendor_stylesheets
end
vendor_javascripts()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 158
def vendor_javascripts
  unless options[:skip_javascript]
    empty_directory_with_keep_file 'vendor/assets/javascripts'
  end
end
vendor_stylesheets()

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 164
def vendor_stylesheets
  empty_directory_with_keep_file 'vendor/assets/stylesheets'
end