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How to upgrade to Rails 4.2

Upgrading some Rails apps is as easy as bundle update rails. But what if you have one of the other kind of apps? The ones that are still on Rails 4.0, or even 3.2, because you didn’t feel like dragging them kicking and screaming into the future? Whether you’re facing a quick upgrade or a painful one, these steps will help you get your app to Rails 4.2 as smoothly as possible.

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