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 80
    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
🔎 See on GitHub

bin()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 90
    def bin
      directory "bin" 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 97
    def bin_when_updating
      bin_yarn_exist = File.exist?("bin/yarn")

      bin

      if options[:api] && !bin_yarn_exist
        remove_file "bin/yarn"
      end
    end
🔎 See on GitHub

config()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 107
    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
🔎 See on GitHub

config_target_version()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 244
    def config_target_version
      defined?(@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 125
    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 assets_config_exist
          remove_file "config/initializers/assets.rb"
        end

        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 62
    def configru
      template "config.ru"
    end
🔎 See on GitHub

credentials()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 181
    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
🔎 See on GitHub

database_yml()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 188
    def database_yml
      template "config/databases/#{options[:database]}.yml", "config/database.yml"
    end
🔎 See on GitHub

db()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 192
    def db
      directory "db"
    end
🔎 See on GitHub

gemfile()

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

gitignore()

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

lib()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 196
    def lib
      empty_directory "lib"
      empty_directory_with_keep_file "lib/tasks"
      empty_directory_with_keep_file "lib/assets"
    end
🔎 See on GitHub

log()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 202
    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 172
    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

package_json()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 76
    def package_json
      template "package.json"
    end
🔎 See on GitHub

public_directory()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 206
    def public_directory
      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

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

storage()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 210
    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 227
    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 215
    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
🔎 See on GitHub

tmp()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 233
    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
🔎 See on GitHub

vendor()

📝 Source code 
# File railties/lib/rails/generators/rails/app/app_generator.rb, line 240
    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 70
    def version_control
      if !options[:skip_git] && !options[:pretend]
        run "git init", capture: options[:quiet]
      end
    end
🔎 See on GitHub