Upgrading to Rails 4 in an existing application can be quite a switch. I decided to make the jump and handle any complications as they come. After about an hour or so I was mostly up and running, with a few issues here and there with gems I am using and their various versions.
Resources
As is often the case, the Railscast on the subject proved invaluable. There is also a robust compilation of Rails 4 links being maintained here.
RubyMine
If you use RubyMine, you may run across an error when trying to start your development server.
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When a new Rails 4 application is created, it generates a ‘bin’ folder. Creating a new, blank Rails 4 application and copying its ‘bin’ folder into the existing project will resolve the error and allow the server to be started in RubyMine.
Gems
One gem that gave me a few errors was simple form. I updated my Gemfile to:
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However, when loading my forms in the browser, I received another error:
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After doing some digging I found that this was actually related to the client_side_validations gem, which I was no longer using and safely removed this from the project. If you need this gem, there is a branch for Rails 4 which should help.
Looking forward to implementing the great additions in Rails 4.