**DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON https://guides.rubyonrails.org.** Ruby on Rails 6.0 Release Notes =============================== Highlights in Rails 6.0: * Action Mailbox * Action Text * Parallel Testing * Action Cable Testing These release notes cover only the major changes. To learn about various bug fixes and changes, please refer to the change logs or check out the [list of commits](https://github.com/rails/rails/commits/6-0-stable) in the main Rails repository on GitHub. -------------------------------------------------------------------------------- Upgrading to Rails 6.0 ---------------------- If you're upgrading an existing application, it's a great idea to have good test coverage before going in. You should also first upgrade to Rails 5.2 in case you haven't and make sure your application still runs as expected before attempting an update to Rails 6.0. A list of things to watch out for when upgrading is available in the [Upgrading Ruby on Rails](upgrading_ruby_on_rails.html#upgrading-from-rails-5-2-to-rails-6-0) guide. Major Features -------------- ### Action Mailbox [Pull Request](https://github.com/rails/rails/pull/34786) [Action Mailbox](https://github.com/rails/rails/tree/6-0-stable/actionmailbox) allows you to route incoming emails to controller-like mailboxes. You can read more about Action Mailbox in the [Action Mailbox Basics](action_mailbox_basics.html) guide. ### Action Text [Pull Request](https://github.com/rails/rails/pull/34873) [Action Text](https://github.com/rails/rails/tree/6-0-stable/actiontext) brings rich text content and editing to Rails. It includes the [Trix editor](https://trix-editor.org) that handles everything from formatting to links to quotes to lists to embedded images and galleries. The rich text content generated by the Trix editor is saved in its own RichText model that's associated with any existing Active Record model in the application. Any embedded images (or other attachments) are automatically stored using Active Storage and associated with the included RichText model. You can read more about Action Text in the [Action Text Overview](action_text_overview.html) guide. ### Parallel Testing [Pull Request](https://github.com/rails/rails/pull/31900) [Parallel Testing](testing.html#parallel-testing) allows you to parallelize your test suite. While forking processes is the default method, threading is supported as well. Running tests in parallel reduces the time it takes your entire test suite to run. ### Action Cable Testing [Pull Request](https://github.com/rails/rails/pull/33659) [Action Cable testing tools](testing.html#testing-action-cable) allow you to test your Action Cable functionality at any level: connections, channels, broadcasts. Railties -------- Please refer to the [Changelog][railties] for detailed changes. ### Removals ### Deprecations ### Notable changes Action Cable ------------ Please refer to the [Changelog][action-cable] for detailed changes. ### Removals ### Deprecations ### Notable changes * The ActionCable javascript package has been converted from CoffeeScript to ES2015, and we now publish the source code in the npm distribution. This allows ActionCable users to depend on the javascript source code rather than the compiled code, which can produce smaller javascript bundles. This change includes some breaking changes to optional parts of the ActionCable javascript API: - Configuration of the WebSocket adapter and logger adapter have been moved from properties of `ActionCable` to properties of `ActionCable.adapters`. - The `ActionCable.startDebugging()` and `ActionCable.stopDebugging()` methods have been removed and replaced with the property `ActionCable.logger.enabled`. Action Pack ----------- Please refer to the [Changelog][action-pack] for detailed changes. ### Removals ### Deprecations ### Notable changes Action View ----------- Please refer to the [Changelog][action-view] for detailed changes. ### Removals ### Deprecations ### Notable changes Action Mailer ------------- Please refer to the [Changelog][action-mailer] for detailed changes. ### Removals ### Deprecations ### Notable changes Active Record ------------- Please refer to the [Changelog][active-record] for detailed changes. ### Removals ### Deprecations ### Notable changes Active Storage -------------- Please refer to the [Changelog][active-storage] for detailed changes. ### Removals ### Deprecations ### Notable changes Active Model ------------ Please refer to the [Changelog][active-model] for detailed changes. ### Removals ### Deprecations ### Notable changes Active Support -------------- Please refer to the [Changelog][active-support] for detailed changes. ### Removals ### Deprecations ### Notable changes Active Job ---------- Please refer to the [Changelog][active-job] for detailed changes. ### Removals ### Deprecations ### Notable changes Ruby on Rails Guides -------------------- Please refer to the [Changelog][guides] for detailed changes. ### Notable changes Credits ------- See the [full list of contributors to Rails](https://contributors.rubyonrails.org/) for the many people who spent many hours making Rails, the stable and robust framework it is. Kudos to all of them. [railties]: https://github.com/rails/rails/blob/6-0-stable/railties/CHANGELOG.md [action-pack]: https://github.com/rails/rails/blob/6-0-stable/actionpack/CHANGELOG.md [action-view]: https://github.com/rails/rails/blob/6-0-stable/actionview/CHANGELOG.md [action-mailer]: https://github.com/rails/rails/blob/6-0-stable/actionmailer/CHANGELOG.md [action-cable]: https://github.com/rails/rails/blob/6-0-stable/actioncable/CHANGELOG.md [active-record]: https://github.com/rails/rails/blob/6-0-stable/activerecord/CHANGELOG.md [active-storage]: https://github.com/rails/rails/blob/6-0-stable/activestorage/CHANGELOG.md [active-model]: https://github.com/rails/rails/blob/6-0-stable/activemodel/CHANGELOG.md [active-support]: https://github.com/rails/rails/blob/6-0-stable/activesupport/CHANGELOG.md [active-job]: https://github.com/rails/rails/blob/6-0-stable/activejob/CHANGELOG.md [guides]: https://github.com/rails/rails/blob/6-0-stable/guides/CHANGELOG.md