string.rb

class String
  class TextHelperSingleton
    def self.instance; @instance ||= new end
    include ActionView::Helpers::TextHelper
  end
  
  def method_missing(method, *args, &block)
    if TextHelperSingleton.instance.respond_to?(method)
      self.class.send(:define_method, method, &block) do
        TextHelperSingleton.instance.send(method, self, *args, &block)
      end
      send(method, *args, &block)
    else
      super
    end
  end
end