Helps you more easily upgrade to Rails 4. A work in progress, I'm simply shipping something of a minimum viable product to attract others to contribute.

Inspired by rails_upgrade which helped upgrade applications from Rails 2 to Rails 3.

Written in part to complement the book Upgrading to Rails 4.

Upgrade to Ruby 1.9.3 if your application does not already use it. Rails 4 requires Ruby 1.9.3, and rails4_upgrade uses 1.9-only syntax and semantics.

Add to Gemfile:

gem 'rails4_upgrade', github: 'alindeman/rails4_upgrade'

Run rake rails4:check:

$ rake rails4:check ** GEM COMPATIBILITY CHECK ** +--------------------+----------------------+ | Dependency Path | Rails Requirement | +--------------------+----------------------+ | draper 0.18.0 | actionpack ~> 3.2 | | draper 0.18.0 | activesupport ~> 3.2 | | simple_form 2.0.4 | actionpack ~> 3.0 | | simple_form 2.0.4 | activemodel ~> 3.0 | +--------------------+----------------------+ 

I'm open to accepting pull requests that improve the functionality of the gem.

If there's an upgrade procedure that can be automated or semi-automated, let's discuss it. Open an issue.

Ideas:

• Recommending versions of gems that may be compatible with Rails 4
• Removing deprecated configuration options
• Adding newly required or recommended configuration options