From: Adriano Nagel <anr@...>
Date: 2010-05-20T10:29:03+09:00
Subject: define_method inside instance_eval

Hi,

I'm trying to create a class macro that, when called, defines a class
method that returns the array passed to the class macro.

For example, I'd have something like this in an included module:

def status_field(*args)
  instance_eval { define_method(:status_all) { args } }
end

(I've put a complete example at http://gist.github.com/407035).

I was under the impression that methods created inside instance_eval
would be defined inside the singleton class, but apparently
define_method seems to ignore that (why?).

So I used the string form of instance_eval and produced this eyesore:

instance_eval %{
  def status_all
    "#{args.join(' ')}".split
  end
}

I must be missing something. Any hints on how to solve this problem
properly? I'd also like to avoid using eval on strings.

Thanks!

--
Adriano
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