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**DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON http://guides.rubyonrails.org.**
Ruby on Rails 5.2 Release Notes
===============================
Highlights in Rails 5.2:
* Active Storage
* Redis Cache Store
* HTTP/2 Early hints support
* Credentials
* Default Content Security Policy
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/5-2-stable) in the main Rails
repository on GitHub.
--------------------------------------------------------------------------------
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.
Major Features
--------------
### Active Storage
[README](https://github.com/rails/rails/blob/d3893ec38ec61282c2598b01a298124356d6b35a/activestorage/README.md)
### Redis Cache Store
[Pull Request](https://github.com/rails/rails/pull/31134)
### HTTP/2 Early hints support
[Pull Request](https://github.com/rails/rails/pull/30744)
### Credentials
[Pull Request](https://github.com/rails/rails/pull/30067)
### Default Content Security Policy
[Pull Request](https://github.com/rails/rails/pull/31162)
Incompatibilities
-----------------
ToDo
Railties
--------
Please refer to the [Changelog][railties] for detailed changes.
### Removals
ToDo
### Notable changes
ToDo
Action Cable
-----------
Please refer to the [Changelog][action-cable] for detailed changes.
### Notable changes
ToDo
Action Pack
-----------
Please refer to the [Changelog][action-pack] for detailed changes.
### Removals
ToDo
### Deprecations
ToDo
### Notable changes
ToDo
Action View
-------------
Please refer to the [Changelog][action-view] for detailed changes.
### Removals
ToDo
### Deprecations
ToDo
### Notable changes
ToDo
Action Mailer
-------------
Please refer to the [Changelog][action-mailer] for detailed changes.
### Notable changes
ToDo
Active Record
-------------
Please refer to the [Changelog][active-record] for detailed changes.
ToDo
### Deprecations
ToDo
### Notable changes
ToDo
Active Model
------------
Please refer to the [Changelog][active-model] for detailed changes.
### Removals
ToDo
### Notable changes
ToDo
Active Storage
--------------
Please refer to the [Changelog][active-support] for detailed changes.
### Notable changes
ToDo
Active Support
--------------
Please refer to the [Changelog][active-support] for detailed changes.
### Removals
ToDo
### Deprecations
ToDo
### Notable changes
ToDo
Active Job
-----------
Please refer to the [Changelog][active-job] for detailed changes.
### Removals
ToDo
### Notable changes
ToDo
Credits
-------
See the
[full list of contributors to Rails](http://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/5-2-stable/railties/CHANGELOG.md
[action-pack]: https://github.com/rails/rails/blob/5-2-stable/actionpack/CHANGELOG.md
[action-view]: https://github.com/rails/rails/blob/5-2-stable/actionview/CHANGELOG.md
[action-mailer]: https://github.com/rails/rails/blob/5-2-stable/actionmailer/CHANGELOG.md
[action-cable]: https://github.com/rails/rails/blob/5-2-stable/actioncable/CHANGELOG.md
[active-record]: https://github.com/rails/rails/blob/5-2-stable/activerecord/CHANGELOG.md
[active-model]: https://github.com/rails/rails/blob/5-2-stable/activemodel/CHANGELOG.md
[active-storage]: https://github.com/rails/rails/blob/5-2-stable/activestorage/CHANGELOG.md
[active-support]: https://github.com/rails/rails/blob/5-2-stable/activesupport/CHANGELOG.md
[active-job]: https://github.com/rails/rails/blob/5-2-stable/activejob/CHANGELOG.md
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