I spent most of my time updating app config. For several of my 3.2 apps, I started using strong_parameters, so it wasn't a leap for me. Another app I have on 4.0 is using the https://github.com/rails/protected_attributes to retain the existing attr_accessible behavior until I get time to update.
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3.2 -> 4 is an order of magnitude easier than 2 -> 3.
The upgrade guide is pretty solid, and I imagine it mostly applies for Rails 4.1 as well: http://guides.rubyonrails.org/upgrading_ruby_on_rails.html#u...
I spent most of my time updating app config. For several of my 3.2 apps, I started using strong_parameters, so it wasn't a leap for me. Another app I have on 4.0 is using the https://github.com/rails/protected_attributes to retain the existing attr_accessible behavior until I get time to update.
Hope that helps!