In Rails 3 a couple of constants/methods were set deprecated. However, there are still plugins which use them. This ends normally in the annoying log message:
DEPRECATION WARNING: RAILS_ROOT is deprecated. Please use ::Rails.root.to_s. (called from <top (required)> at /Users/heli/hemju/programming/workspace/rubymine/linguist/config/application.rb:12)
So what to do when you want to get rid of them? Find them, (optional) create a patch, and report them to the plugin maintainer. One easy way to find deprecated elements is to override them and let them throw an exception or set them to nil. So in the above case, I would add RAILS_ROOT = nil to an initializer. At the next startup there will probably be an exception thrown and you know exactly where to find the deprecated method. Now start patching.
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