From: Satsou Sa <moshimoshi.here@...>
Date: 2010-12-30T23:31:06+09:00
Subject: How to hook a callback through inheritance

Hello,

I've got some troubles with Ruby about callbacks (and inheritance). Here
is my code:

  class Lmao
    def initialize
      @str = "HAHAHAHAHAHHAHAHAH"
      @before_laughing = []
    end

    def self.inherited(base)
      base.extend(Callbacks)
    end

    def laughing
      @before_laughing.each {|method| send(method) }
      @str
    end
  end

  module Callbacks
    def before_laughing(*methods)
      @before_laughing = methods
    end
  end

  class Lol < Lmao
    before_laughing :downcase_please

    def downcase_please
      @str.downcase!
    end
  end

  a = Lol.new
  a.laughing # => "HAHAHAHAHAHHAHAHAH"

And as you can see, my before laughing callback don't work... because
the array @before_laughing is empty. I believe this can be fixed by
editing the way I save *methods into an Lol's instance method (from
inside Callbacks). But I don't really see how...

If you know the solution, thanks for your light!

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