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.

class CustomAppBuilder < Rails::AppBuilder
  def test
    @generator.gem "rspec-rails", group: [:development, :test]
    run "bundle install"
    generate "rspec:install"
  end
end

Methods

Instance Public methods

app()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 79
def app
  directory "app"

  empty_directory_with_keep_file "app/assets/images"

  keep_file  "app/controllers/concerns"
  keep_file  "app/models/concerns"
end

bin()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 88
def bin
  directory "bin" do |content|
    "#{shebang}\n" + content
  end
  chmod "bin", 0755 & ~File.umask, verbose: false
end

bin_when_updating()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 95
def bin_when_updating
  bin

  if options[:skip_javascript]
    remove_file "bin/yarn"
  end
end

config()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 103
def config
  empty_directory "config"

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

    directory "environments"
    directory "initializers"
    directory "locales"
  end
end

config_target_version()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 237
def config_target_version
  defined?(@config_target_version) ? @config_target_version : Rails::VERSION::STRING.to_f
end

config_when_updating()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 121
def config_when_updating
  cookie_serializer_config_exist = File.exist?("config/initializers/cookies_serializer.rb")
  action_cable_config_exist      = File.exist?("config/cable.yml")
  active_storage_config_exist    = File.exist?("config/storage.yml")
  rack_cors_config_exist         = File.exist?("config/initializers/cors.rb")
  assets_config_exist            = File.exist?("config/initializers/assets.rb")
  csp_config_exist               = File.exist?("config/initializers/content_security_policy.rb")

  @config_target_version = Rails.application.config.loaded_config_version || "5.0"

  config

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

  if !options[:skip_action_cable] && !action_cable_config_exist
    template "config/cable.yml"
  end

  if !skip_active_storage? && !active_storage_config_exist
    template "config/storage.yml"
  end

  if options[:skip_sprockets] && !assets_config_exist
    remove_file "config/initializers/assets.rb"
  end

  unless rack_cors_config_exist
    remove_file "config/initializers/cors.rb"
  end

  if options[:api]
    unless cookie_serializer_config_exist
      remove_file "config/initializers/cookies_serializer.rb"
    end

    unless csp_config_exist
      remove_file "config/initializers/content_security_policy.rb"
    end
  end
end

configru()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 61
def configru
  template "config.ru"
end

credentials()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 173
def credentials
  return if options[:pretend] || options[:dummy_app]

  require "rails/generators/rails/credentials/credentials_generator"
  Rails::Generators::CredentialsGenerator.new([], quiet: options[:quiet]).add_credentials_file_silently
end

database_yml()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 180
def database_yml
  template "config/databases/#{options[:database]}.yml", "config/database.yml"
end

db()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 184
def db
  directory "db"
end

gemfile()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 57
def gemfile
  template "Gemfile"
end

gitignore()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 65
def gitignore
  template "gitignore", ".gitignore"
end

lib()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 188
def lib
  empty_directory "lib"
  empty_directory_with_keep_file "lib/tasks"
  empty_directory_with_keep_file "lib/assets"
end

log()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 194
def log
  empty_directory_with_keep_file "log"
end

master_key()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 164
def master_key
  return if options[:pretend] || options[:dummy_app]

  require "rails/generators/rails/master_key/master_key_generator"
  master_key_generator = Rails::Generators::MasterKeyGenerator.new([], quiet: options[:quiet], force: options[:force])
  master_key_generator.add_master_key_file_silently
  master_key_generator.ignore_master_key_file_silently
end

package_json()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 75
def package_json
  template "package.json"
end

public_directory()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 198
def public_directory
  directory "public", "public", recursive: false
end

rakefile()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 45
def rakefile
  template "Rakefile"
end

readme()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 49
def readme
  copy_file "README.md", "README.md"
end

ruby_version()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 53
def ruby_version
  template "ruby-version", ".ruby-version"
end

storage()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 202
def storage
  empty_directory_with_keep_file "storage"
  empty_directory_with_keep_file "tmp/storage"
end

system_test()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 220
def system_test
  empty_directory_with_keep_file "test/system"

  template "test/application_system_test_case.rb"
end

test()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 207
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/channels/application_cable/connection_test.rb"
  template "test/test_helper.rb"
end

tmp()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 226
def tmp
  empty_directory_with_keep_file "tmp"
  empty_directory_with_keep_file "tmp/pids"
  empty_directory "tmp/cache"
  empty_directory "tmp/cache/assets"
end

vendor()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 233
def vendor
  empty_directory_with_keep_file "vendor"
end

version_control()

Source: 

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 69
def version_control
  if !options[:skip_git] && !options[:pretend]
    run "git init", capture: options[:quiet], abort_on_failure: false
  end
end