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 code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 102
def app
  directory "app"

  empty_directory_with_keep_file "app/assets/images"

  keep_file  "app/controllers/concerns"
  keep_file  "app/models/concerns"
end
🔎 See on GitHub

bin()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 111
def bin
  exclude_pattern = Regexp.union([(/thrust/ if skip_thruster?), (/rubocop/ if skip_rubocop?), (/brakeman/ if skip_brakeman?), (/bundler-audit/ if skip_bundler_audit?)].compact)
  directory "bin", { exclude_pattern: exclude_pattern } do |content|
    "#{shebang}\n" + content
  end
  chmod "bin", 0755 & ~File.umask, verbose: false
end
🔎 See on GitHub

bin_when_updating()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 119
def bin_when_updating
  bin
end
🔎 See on GitHub

cifiles()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 86
def cifiles
  empty_directory ".github/workflows"
  template "github/ci.yml", ".github/workflows/ci.yml"
  template "github/dependabot.yml", ".github/dependabot.yml"
end
🔎 See on GitHub

config()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 123
def config
  empty_directory "config"

  inside "config" do
    template "routes.rb" unless options[:update]
    template "application.rb"
    template "environment.rb"
    template "bundler-audit.yml" unless skip_bundler_audit?
    template "cable.yml" unless options[:update] || skip_action_cable?
    template "ci.rb"
    template "puma.rb"
    template "storage.yml" unless options[:update] || skip_active_storage?

    directory "environments"
    directory "initializers"
    directory "locales" unless options[:update]
  end
end
🔎 See on GitHub

config_target_version()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 272
def config_target_version
  @config_target_version || Rails::VERSION::STRING.to_f
end
🔎 See on GitHub

config_when_updating()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 142
def config_when_updating
  action_cable_config_exist       = File.exist?("config/cable.yml")
  active_storage_config_exist     = File.exist?("config/storage.yml")
  ci_config_exist                 = File.exist?("config/ci.rb")
  bundle_audit_config_exist       = File.exist?("config/bundler-audit.yml")
  rack_cors_config_exist          = File.exist?("config/initializers/cors.rb")
  assets_config_exist             = File.exist?("config/initializers/assets.rb")
  asset_app_stylesheet_exist      = File.exist?("app/assets/stylesheets/application.css")
  csp_config_exist                = File.exist?("config/initializers/content_security_policy.rb")

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

  config

  if !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 !ci_config_exist
    template "config/ci.rb"
  end

  if skip_asset_pipeline? && !assets_config_exist
    remove_file "config/initializers/assets.rb"
  end

  if skip_asset_pipeline? && !asset_app_stylesheet_exist
    remove_file "app/assets/stylesheets/application.css"
  end

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

  if !skip_bundler_audit? && !bundle_audit_config_exist
    template "config/bundler-audit.yml"
  end

  if options[:api]
    unless csp_config_exist
      remove_file "config/initializers/content_security_policy.rb"
    end
  end
end
🔎 See on GitHub

configru()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 66
def configru
  template "config.ru"
end
🔎 See on GitHub

credentials()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 199
def credentials
  return if options[:pretend] || options[:dummy_app]

  require "rails/generators/rails/credentials/credentials_generator"
  Rails::Generators::CredentialsGenerator.new([], quiet: true).add_credentials_file
end
🔎 See on GitHub

credentials_diff_enroll()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 206
def credentials_diff_enroll
  return if options[:skip_decrypted_diffs] || options[:dummy_app] || options[:pretend]

  @generator.shell.mute do
    rails_command "credentials:diff --enroll", inline: true, shell: @generator.shell
  end
end
🔎 See on GitHub

database_yml()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 214
def database_yml
  template database.template, "config/database.yml"
end
🔎 See on GitHub

db()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 218
def db
  directory "db"
end
🔎 See on GitHub

devcontainer()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 276
def devcontainer
  devcontainer_options = {
    database: options[:database],
    redis: options[:skip_solid] && !(options[:skip_action_cable] && options[:skip_active_job]),
    kamal: !options[:skip_kamal],
    system_test: depends_on_system_test?,
    active_storage: !options[:skip_active_storage],
    dev: options[:dev],
    node: using_node?,
    app_name: app_name,
    skip_solid: options[:skip_solid],
    pretend: options[:pretend]
  }
  Rails::Generators::DevcontainerGenerator.new([], devcontainer_options).invoke_all
end
🔎 See on GitHub

dockerfiles()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 78
def dockerfiles
  template "Dockerfile"
  template "dockerignore", ".dockerignore"

  template "docker-entrypoint", "bin/docker-entrypoint"
  chmod "bin/docker-entrypoint", 0755 & ~File.umask, verbose: false
end
🔎 See on GitHub

gemfile()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 62
def gemfile
  template "Gemfile"
end
🔎 See on GitHub

gitattributes()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 74
def gitattributes
  template "gitattributes", ".gitattributes"
end
🔎 See on GitHub

gitignore()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 70
def gitignore
  template "gitignore", ".gitignore"
end
🔎 See on GitHub

lib()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 222
def lib
  empty_directory "lib"
  empty_directory_with_keep_file "lib/tasks"
end
🔎 See on GitHub

log()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 227
def log
  empty_directory_with_keep_file "log"
end
🔎 See on GitHub

master_key()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 191
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
end
🔎 See on GitHub

node_version()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 58
def node_version
  template "node-version", ".node-version"
end
🔎 See on GitHub

public_directory()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 231
def public_directory
  return if options[:update] && options[:api]

  directory "public", "public", recursive: false
end
🔎 See on GitHub

rakefile()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 46
def rakefile
  template "Rakefile"
end
🔎 See on GitHub

readme()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 50
def readme
  copy_file "README.md", "README.md"
end
🔎 See on GitHub

rubocop()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 92
def rubocop
  template "rubocop.yml", ".rubocop.yml"
end
🔎 See on GitHub

ruby_version()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 54
def ruby_version
  template "ruby-version", ".ruby-version"
end
🔎 See on GitHub

script()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 237
def script
  empty_directory_with_keep_file "script"
end
🔎 See on GitHub

storage()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 241
def storage
  empty_directory_with_keep_file "storage"
  empty_directory_with_keep_file "tmp/storage"
end
🔎 See on GitHub

system_test()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 257
def system_test
  empty_directory_with_keep_file "test/system"

  template "test/application_system_test_case.rb"
end
🔎 See on GitHub

test()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 246
def test
  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
🔎 See on GitHub

tmp()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 263
def tmp
  empty_directory_with_keep_file "tmp"
  empty_directory_with_keep_file "tmp/pids"
end
🔎 See on GitHub

vendor()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 268
def vendor
  empty_directory_with_keep_file "vendor"
end
🔎 See on GitHub

version_control()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 96
def version_control
  if !options[:skip_git] && !options[:pretend]
    run git_init_command, capture: options[:quiet], abort_on_failure: false
  end
end
🔎 See on GitHub