As per Rails doc ( http://guides.rubyonrails.org/plugins.html#extending-core-classes ) my app being yoodle
I added in yoodle/lib yoodle.rb require "yoodle/core_ext" module Yoodle end in yoodle/lib/my_app/core_ext String.class_eval do def to_squawk "squawk! #{self}".strip end end and I have added in yoodle/config/application.rb config.autoload_paths += Dir["#{config.root}/lib", "#{config.root}/lib/**/"] but running in console > "AAA".to_squawk raises an error NoMethodError: undefined method `to_squawk' for "AAA":String Is there anything else not mentionned in the Rails doc ? -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/FFN6nkjcy_wJ. For more options, visit https://groups.google.com/groups/opt_out.