ruby prepend

prepend.rb

class Car
  def info
    # some long method
    puts "Only some info"
  end
end

module FullInfo
  def enable
    @show_full_info = true
    self
  end

  def info
    if @show_full_info
      puts "Full info"
    else
      super
    end
  end
end

Car.prepend FullInfo

Car.new.enable.info
Car.new.info
puts Car.ancestors.inspect

## Output:
#
# Full info
# Only some info
# [FullInfo, Car, Object, Kernel, BasicObject]