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Ruby on Rails 5.2 Release Notes

Highlights in Rails 5.2:

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 in the main Rails repository on GitHub.

1 Upgrading to Rails 5.2

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 5.1 in case you haven't and make sure your application still runs as expected before attempting an update to Rails 5.2.

2 Major Features

2.1 Active Storage

README

2.2 Redis Cache Store

Pull Request

2.3 HTTP/2 Early hints support

Pull Request

2.4 Credentials

Pull Request

2.5 Default Content Security Policy

Pull Request

3 Incompatibilities

ToDo

4 Railties

Please refer to the Changelog for detailed changes.

4.1 Removals

ToDo

4.2 Notable changes

ToDo

5 Action Cable

Please refer to the Changelog for detailed changes.

5.1 Notable changes

ToDo

6 Action Pack

Please refer to the Changelog for detailed changes.

6.1 Removals

ToDo

6.2 Deprecations

ToDo

6.3 Notable changes

ToDo

7 Action View

Please refer to the Changelog for detailed changes.

7.1 Removals

ToDo

7.2 Deprecations

ToDo

7.3 Notable changes

ToDo

8 Action Mailer

Please refer to the Changelog for detailed changes.

8.1 Notable changes

ToDo

9 Active Record

Please refer to the Changelog for detailed changes.

ToDo

9.1 Deprecations

ToDo

9.2 Notable changes

ToDo

10 Active Model

Please refer to the Changelog for detailed changes.

10.1 Removals

ToDo

10.2 Notable changes

ToDo

11 Active Support

Please refer to the Changelog for detailed changes.

11.1 Removals

ToDo

11.2 Deprecations

ToDo

11.3 Notable changes

ToDo

12 Active Job

Please refer to the Changelog for detailed changes.

12.1 Removals

ToDo

12.2 Notable changes

ToDo

13 Credits

See the full list of contributors to Rails for the many people who spent many hours making Rails, the stable and robust framework it is. Kudos to all of them.

Feedback

You're encouraged to help improve the quality of this guide.

Please contribute if you see any typos or factual errors. To get started, you can read our documentation contributions section.

You may also find incomplete content or stuff that is not up to date. Please do add any missing documentation for master. Make sure to check Edge Guides first to verify if the issues are already fixed or not on the master branch. Check the Ruby on Rails Guides Guidelines for style and conventions.

If for whatever reason you spot something to fix but cannot patch it yourself, please open an issue.

And last but not least, any kind of discussion regarding Ruby on Rails documentation is very welcome on the rubyonrails-docs mailing list.