Make your Rails 5 upgrade easier with Rubocop

Rubocop will only run these rules once the TargetRailsVersion is 5.0 or higher, so I recommend using these rules to ‘autofix’ deprecations after upgrading to Rails 5.0

There’s been quite a bit written about how to upgrade Rails, which we found very useful:

But none of these guides mention that Rubocop has some great cops to make your upgrade quicker and easier. We found we could

Why use Rubocop during the upgrade?
Rubocop offers two benefits:

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Rubocop will only run these rules once the TargetRailsVersion is 5.0 or higher, so I recommend using these rules to ‘autofix’ deprecations after upgrading the Rails gem to 5.0.

Go about your Rails upgrade as described in the Rails Guides and other blog posts. You should be able to get the tests passing without having to touch the things that we’re about to ‘autofix’ with Rubocop (although you will see a lot of Deprecation Warnings in your test output)!

First, add an ApplicationRecord class to your app:

Now automatically update all ActiveRecord models to inherit from that class:

Now review and merge 🎉

Now rinse and repeat with ActiveJob:

You should now have vastly fewer Deprecation warnings in your test output:

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