问题
I'm trying to access the RAILS_ROOT constant in a file residing in the /lib directory, but I'm not able to (uninitialized constant error). Is there something that I need to require to be able to do this?
回答1:
Yes, you should require the environment.rb:
require File.dirname(__FILE__) + '/../config/environment.rb'
puts RAILS_ROOT
And Rails.root instead.
来源：https://stackoverflow.com/questions/2933225/rails-root-require