From: Brian Candler <b.candler@...>
Date: 2011-10-21T00:22:43+09:00
Subject: Re: Call method on attribute update

Jason Lillywhite wrote in post #1027518:
> Hello,
>
> I have an attribute in my class called @yn. If I change the value of @yn
> by doing this:
>
> foo.yn = 100.0
>
> How do I cause another method in the class to automatically run?

class Foo
  attr_accessor :yn

  # This is the general way to wrap a method call
  alias :old_yn= :yn=
  def yn=(val)
    self.old_yn = val
    puts "Yay!"
  end
end

foo = Foo.new
foo.yn = 123

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