From: James Edward Gray II <james@...>
Date: 2006-12-12T07:14:31+09:00
Subject: Re: best way to dynamically create new instance methods

On Dec 11, 2006, at 2:28 PM, Dan Tenenbaum wrote:

> What I want create_method() to do (simplified here) is, given the
> argument "baz", add a method to the current instance of Foo that would
> look like this if it were a traditional method (that is, not  
> dynamically
> created):
>
> def baz(*args)
>   args[0]
> end

 >> class Dynamic
 >>   def initialize(name)
 >>     create_method(name)
 >>   end
 >>   private
 >>   def create_method(name)
 >>     class << self; self end.send(:define_method, name) { |*args|  
args.first }
 >>   end
 >> end
=> nil
 >> foo = Dynamic.new(:foo)=> #<Dynamic:0x71dbd4>
 >> bar = Dynamic.new(:bar)
=> #<Dynamic:0x71b3fc>
 >> foo.foo("Hi")
=> "Hi"
 >> foo.bar("Hi")
NoMethodError: undefined method `bar' for #<Dynamic:0x71dbd4>
         from (irb):33
 >> bar.bar("Hi")
=> "Hi"

Hope that helps.

James Edward Gray II