From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-02-12T19:27:32+09:00
Subject: Re: String to symbol

On Fri, Feb 12, 2010 at 11:12 AM, Sergey Sheypak
<serega.sheypak@gmail.com> wrote:
>
>> I referred to passing strings to #initialize.  This certainly works.
>> But the more dramatic issue persists (see above).
> Seems like I got it here:
> http://www.ruby-forum.com/topic/204068
>
> Is there any opportunity to add attributes to instance, not to class?

Send the define method to the singleton class of the object, instead
of sending it to the class:

irb(main):001:0> class Task
irb(main):002:1> def initialize options
irb(main):003:2> options.each_pair do |k,v|
irb(main):004:3* (class << self; self; end).send(:define_method, k, Proc.new{v})
irb(main):005:3> end
irb(main):006:2> end
irb(main):007:1> end
=> nil
irb(main):008:0> t = Task.new(:id => 1)
=> #<Task:0xb7d4aca8>
irb(main):009:0> t.id
=> 1
irb(main):010:0> t2 = Task.new(:id => 2)
=> #<Task:0xb7d3ecdc>
irb(main):012:0> t.id
=> 1
irb(main):013:0> t2.id
=> 2

Jesus.