From: "Ara.T.Howard" <ahoward@...>
Date: 2004-07-29T12:21:46+09:00
Subject: Re: Automatically setting attributes

On Thu, 29 Jul 2004, Laughlin, Joseph V wrote:

> How can I do something like the following:
>
> class Foo
>
>    attr_accessor :goo, :moo
>
>    def initalize
>        @attr.each { | attrib| attrib = 0 }
>    end
> end
>
> In case it's not clear, I want to set all attributes of the Foo object
> to zero.  But I can't seem to get the syntax for it correct.
>
> Thanks,
> Joe

   ~ > cat a.rb
   require 'yaml'

   class Klass
     ATTRIBUTES =
       %w(
         foo
         bar
         foobar
       )

     ATTRIBUTES.each{|a| attr a, true}

     def initialize
       attributes.each{|a| send "#{ a }=", 0}
     end

     def attributes
       ATTRIBUTES
     end

     def to_yaml(*args,&block)
       attributes.inject({}) do |h,a|
         h[a] = send a
         h
       end.to_yaml(*args,&block)
     end
   end

   obj = Klass.new
   y obj


   ~ > ruby a.rb
   ---
   foobar: 0
   foo: 0
   bar: 0


cheers.


-a
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