Upgrading to Rails 4 covers each change and guides you through the tweaks you'll need to make for a smooth upgrade.
Upgrading to Rails 4 covers the features you'll want to be aware of when modernizing existing applications.
Upgrading to Rails 4 covers specific scenarios you may encounter with upgrading and what to do when come across them.
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matchmay be affected
vendor/are no longer automatically precompiled
ActionController::Livefor live streaming
bin/and checked into source control (
The source code for the book is open source. After purchasing the book, you'll periodically receive updates (via email) as new content is contributed.
Some chapters in the book use the rails4_upgrade gem, a free/open-source project I started to make certain elements of the upgrade process easier. Check it out and let me know what you think.
Thanks to these folks who are looking over the book's content for technical accuracy and overall flow: