Flowdock

Notes posted by npearson72

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December 10, 2012
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@drewyoung1

Including module in a class does not automatically over-write methods defined with the same name.

Ex:

module Mod

def exit(code = 0)
  puts "Exiting with code #{code}"
  super
end

end

class OriginalClass

include Mod
def exit
  puts "Original message"
end

end

OriginalClass.new.exit 99

Produces:

exit': wrong number of arguments (1 for 0) (ArgumentError)

if you use this construct, the alias_method will work similar to super:

module Mod

alias_method :super_exit, :exit
def self.included base
  base.instance_eval do
    def exit(code = 0)
      puts "Exiting with code #{code}"
      super_exit
    end
  end
end

end