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Rails 4.0.0 (unreleased)

  • App executables now live in the bin/ directory: bin/bundle, bin/rails, bin/rake. Run rake rails:update:bin to add these executables to your own app. script/rails is gone from new apps.

    Running executables within your app ensures they use your app's Ruby version and its bundled gems, and it ensures your production deployment tools only need to execute a single script. No more having to carefully cd to the app dir and run bundle exec ....

    Rather than treating bin/ as a junk drawer for generated "binstubs", bundler 1.3 adds support for generating stubs for just the executables you actually use: bundle binstubs unicorn generates bin/unicorn. Add that executable to git and version it just like any other app code.

    Jeremy Kemper

  • config.assets.enabled is now true by default. If you're upgrading from a Rails 3.x app that does not use the asset pipeline, you'll be required to add config.assets.enabled = false to your application.rb. If you don't want the asset pipeline on a new app use --skip-sprockets


  • Environment name can be a start substring of the default environment names (production, development, test). For example: tes, pro, prod, dev, devel. Fix #8628.

    Mykola Kyryk

  • Add -B alias for --skip-bundle option in the rails new generators.

    Jiri Pospisil

  • Quote column names in generates fixture files. This prevents conflicts with reserved YAML keywords such as 'yes' and 'no' Fix #8612.

    Yves Senn

  • Explicit options have precedence over ~/.railsrc on the rails new command.

    Rafael Mendonça França

  • Generated migrations now always use the change method.

    Marc-André Lafortune

  • Add app/models/concerns and app/controllers/concerns to the default directory structure and load path. See for usage instructions.


  • The rails/info/routes now correctly formats routing output as an html table.

    Richard Schneeman

  • The public/index.html is no longer generated for new projects. Page is replaced by internal welcome_controller inside of railties.

    Richard Schneeman

  • Add ENV['RACK_ENV'] support to rails runner/console/server.


  • Add db to list of folders included by rake notes and rake notes:custom. Antonio Cangiano

  • Engines with a dummy app include the rake tasks of dependencies in the app namespace. Fix #8229

    Yves Senn

  • Add sqlserver.yml template file to satisfy -d sqlserver being passed to rails new. Fix #6882

    Robert Nesius

  • Rake test:uncommitted finds git directory in ancestors Nicolas Despres

  • Add dummy app Rake tasks when --skip-test-unit and --dummy-path is passed to the plugin generator. Fix #8121

    Yves Senn

  • Add .rake to list of file extensions included by rake notes and rake notes:custom. Brent J. Nordquist

  • New test locations test/models, test/helpers, test/controllers, and test/mailers. Corresponding rake tasks added as well. Mike Moore

  • Set a different cache per environment for assets pipeline through config.assets.cache.

    Guillermo Iguaran

  • Rails.public_path now returns a Pathname object. Prem Sichanugrist

  • Remove highly uncommon config.assets.manifest option for moving the manifest path. This option is now unsupported in sprockets-rails.

    Guillermo Iguaran & Dmitry Vorotilin

  • Add config.action_controller.permit_all_parameters to disable StrongParameters protection, it's false by default.

    Guillermo Iguaran

  • Remove config.active_record.whitelist_attributes and config.active_record.mass_assignment_sanitizer from new applications since MassAssignmentSecurity has been extracted from Rails.

    Guillermo Iguaran

  • Change rails new and rails plugin new generators to name the .gitkeep files as .keep in a more SCM-agnostic way.

    Change --skip-git option to only skip the .gitignore file and still generate the .keep files.

    Add --skip-keeps option to skip the .keep files.

    Derek Prior & Francesco Rodriguez

  • Fixed support for DATABASE_URL environment variable for rake db tasks. Grace Liu

  • rails dbconsole now can use SSL for MySQL. The database.yml options sslca, sslcert, sslcapath, sslcipher, and sslkey now affect rails dbconsole. Jim Kingdon and Lars Petrus

  • Correctly handle SCRIPT_NAME when generating routes to engine in application that's mounted at a sub-uri. With this behavior, you should not use default_url_options[:script_name] to set proper application's mount point by yourself. Piotr Sarnacki

  • config.threadsafe! is deprecated in favor of config.eager_load which provides a more fine grained control on what is eager loaded José Valim

  • The migration generator will now produce AddXXXToYYY/RemoveXXXFromYYY migrations with references statements, for instance

    rails g migration AddReferencesToProducts user:references supplier:references{polymorphic}

    will generate the migration with:

    add_reference :products, :user, index: true
    add_reference :products, :supplier, polymorphic: true, index: true

    Aleksey Magusev

  • Allow scaffold/model/migration generators to accept a polymorphic modifier for references/belongs_to, for instance

    rails g model Product supplier:references{polymorphic}

    will generate the model with belongs_to :supplier, polymorphic: true association and appropriate migration.

    Aleksey Magusev

  • Set config.active_record.migration_error to :page_load for development Richard Schneeman

  • Add runner to Rails::Railtie as a hook called just after runner starts. José Valim & kennyj

  • Add /rails/info/routes path, displays same information as rake routes Richard Schneeman & Andrew White

  • Improved rake routes output for redirects Łukasz Strzałkowski & Andrew White

  • Load all environments available in config.paths["config/environments"]. Piotr Sarnacki

  • Remove Rack::SSL in favour of ActionDispatch::SSL. Rafael Mendonça França

  • Remove Active Resource from Rails framework. Prem Sichangrist

  • Allow to set class that will be used to run as a console, other than IRB, with Rails.application.config.console=. It's best to add it to console block. Piotr Sarnacki


    # it can be added to config/application.rb
    console do
      # this block is called only when running console,
      # so we can safely require pry here
      require "pry"
      config.console = Pry
  • Add convenience hide! method to Rails generators to hide current generator namespace from showing when running rails generate. Carlos Antonio da Silva

  • Rails::Plugin has gone. Instead of adding plugins to vendor/plugins use gems or bundler with path or git dependencies. Santiago Pastorino

  • Set config.action_mailer.async = true to turn on asynchronous message delivery Brian Cardarella

Please check 3-2-stable for previous changes.

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