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?)].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 "cable.yml" unless options[:update] || options[:skip_action_cable]
        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 261
    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 140
    def config_when_updating
      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")
      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 !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 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 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 188
    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 195
    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 203
    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 207
    def db
      directory "db"
    end
🔎 See on GitHub

devcontainer()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 265
    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]
      }

      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 211
    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 216
    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 179
    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
🔎 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 220
    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 226
    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 230
    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 246
    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 235
    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 252
    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 257
    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