Define method to keep track on attribute history

attr_history.rb

class Class
  def attr_accessor_with_history attr_name
    attr_name = attr_name.to_s # make sure it's a string
    attr_reader attr_name # create the attribute's getter
    attr_reader attr_name+"_history" # create bar_history getter
    class_eval %Q{
      def #{attr_name}=(value)
        @#{attr_name}_history.nil? ? @#{attr_name}_history = [#{attr_name}, value] : @#{attr_name}_history << value
        @#{attr_name} = value
      end
    } 
  end
end

class Resto
  attr_accessor_with_history :adresse
end