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  • Generates html and text templates for mailers by default.

    Kassio Borges

  • Move secret_key_base from config/initializers/secret_token.rb to config/secrets.yml.

    secret_key_base is now saved in Rails.application.secrets.secret_key_base and it fallbacks to the value of config.secret_key_base when it is not present in config/secrets.yml.

    config/initializers/secret_token.rb is not generated by default in new applications.

    Guillermo Iguaran

  • Generate a new secrets.yml file in the config folder for new applications. By default, this file contains the application's secret_key_base, but it could also be used to store other secrets such as access keys for external APIs.

    The secrets added to this file will be accessible via Rails.application.secrets. For example, with the following secrets.yml:

      secret_key_base: 3b7cd727ee24e8444053437c36cc66c3
      some_api_key: SOMEKEY

    Rails.application.secrets.some_api_key will return SOMEKEY in the development environment.

    Guillermo Iguaran

  • Add ENV['DATABASE_URL'] support in rails dbconsole. Fixes #13320.

    Huiming Teo

  • Add Application#message_verifier method to return a message verifier.

    This verifier can be used to generate and verify signed messages in the application.

    message = Rails.application.message_verifier(:sensitive_data).generate('my sensible data')
    # => 'my sensible data'

    It is recommended not to use the same verifier for different things, so you can get different verifiers passing the name argument.

    message = Rails.application.message_verifier(:cookies).generate('my sensible cookie data')

    See the ActiveSupport::MessageVerifier documentation for more information.

    Rafael Mendonça França

  • The Spring application preloader is now installed by default for new applications. It uses the development group of the Gemfile, so will not be installed in production.

    Jon Leighton

  • Uses .railsrc while creating new plugin if it is available. Fixes #10700.

    Prathamesh Sonpatki

  • Remove turbolinks when generating a new application based on a template that skips it.


    Skips turbolinks adding `add_gem_entry_filter { |gem| != "turbolinks" }`
    to the template.

    Lauro Caetano

  • Instrument an load_config_initializer.railties event on each load of configuration initializer from config/initializers. Subscribers should be attached before load_config_initializers initializer completed.

    Registering subscriber examples:

    # config/application.rb
    module RailsApp
      class Application < Rails::Application
        ActiveSupport::Notifications.subscribe('load_config_initializer.railties') do |*args|
          event =*args)
          puts "Loaded initializer #{event.payload[:initializer]} (#{event.duration}ms)"
    # my_engine/lib/my_engine/engine.rb
    module MyEngine
      class Engine < ::Rails::Engine
        config.before_initialize do
          ActiveSupport::Notifications.subscribe('load_config_initializer.railties') do |*args|
            event =*args)
            puts "Loaded initializer #{event.payload[:initializer]} (#{event.duration}ms)"

    Paul Nikitochkin

  • Support for Pathnames in eager load paths.

    Mike Pack

  • Fixed missing line and shadow on service pages(404, 422, 500).

    Dmitry Korotkov

  • BACKTRACE environment variable to show unfiltered backtraces for test failures.


    $ BACKTRACE=1 ruby -Itest ...
    # or with rake
    $ BACKTRACE=1 bin/rake

    Yves Senn

  • Removal of all javascript stuff (gems and files) when generating a new application using the --skip-javascript option.

    Robin Dupret

  • Make the application name snake cased when it contains spaces

    The application name is used to fill the database.yml and session_store.rb files ; previously, if the provided name contained whitespaces, it led to unexpected names in these files.

    Robin Dupret

  • Added --model-name option to ScaffoldControllerGenerator.


  • Expose MiddlewareStack#unshift to environment configuration.

    Ben Pickles

  • rails server will only extend the logger to output to STDOUT in development environment.

    Richard Schneeman

  • Don't require passing path to app before options in rails new and rails plugin new

    Piotr Sarnacki

  • rake notes now searches *.less files

    Josh Crowder

  • Generate nested route for namespaced controller generated using rails g controller. Fixes #11532.


    rails g controller admin/dashboard index
    # Before:
    get "dashboard/index"
    # After:
    namespace :admin do
      get "dashboard/index"

    Prathamesh Sonpatki

  • Fix the event name of action_dispatch requests.

    Rafael Mendonça França

  • Make config.log_level work with custom loggers.

    Max Shytikov

  • Changed stylesheet load order in the stylesheet manifest generator. Fixes #11639.

    Pawel Janiak

  • Added generated unit test for generator generator using new test:generators rake task.

    Josef Šimánek

  • Removed update:application_controller rake task.

    Josef Šimánek

  • Fix rake environment to do not eager load modules

    Paul Nikitochkin

  • Fix rake notes to look into *.sass files

    Yuri Artemev

  • Removed deprecated Rails.application.railties.engines.

    Arun Agrawal

  • Removed deprecated threadsafe! from Rails Config.

    Paul Nikitochkin

  • Remove deprecated ActiveRecord::Generators::ActiveModel#update_attributes in favor of ActiveRecord::Generators::ActiveModel#update.

    Vipul A M

  • Remove deprecated config.whiny_nils option.

    Vipul A M

  • Rename commands/plugin_new.rb to commands/plugin.rb and fix references

    Richard Schneeman

  • Fix rails plugin --help command.

    Richard Schneeman

  • Omit turbolinks configuration completely on skip_javascript generator option.

    Nikita Fedyashev

  • Removed deprecated rake tasks for running tests: rake test:uncommitted and rake test:recent.

    John Wang

  • Clearing autoloaded constants triggers routes reloading. Fixes #10685.

    Xavier Noria

  • Fixes bug with scaffold generator with --assets=false --resource-route=false. Fixes #9525.

    Arun Agrawal

  • Rails::Railtie no longer forces the Rails::Configurable module on everything that subclasses it. Instead, the methods from Rails::Configurable have been moved to class methods in Railtie and the Railtie has been made abstract.

    John Wang

  • Changes repetitive th tags to use colspan attribute in index.html.erb template.

    Sıtkı Bağdat

Please check 4-0-stable for previous changes.

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