[Rails] Rails 3.2 Extending String Core Classe as per Rails doc

[Erwin]

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 ?





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