From: Robert Klemme <shortcutter@...>
Date: 2007-08-18T18:09:57+09:00
Subject: Re: Problem with Array#delete

On 18.08.2007 08:34, Matthew B Gardner wrote:
> Sorry, I only meant the code I posted as an example of what is happening -- 
> the actual code would be a little hard to gather and format, but I will do so 
> if the following isn't enough information:
> 
> ruby -v #=> ruby 1.8.4 (2005-12-24) [i486-linux]
> 
> Ok, I threw this code in to gather some info, and following it is the 
> printout:
> 
> p world.characters.class
> p world.characters.size
> world.characters.each do |ch|
> 	p ch.class
> 	p ch.object_id
> end
> world.characters.delete(self)
> p world.characters
> 
> Array
> 2
> Character
> -607336504
> Character
> -607410834
> []
> 
> Do I need to format up the code, or is there something telling from the 
> information here?


The crucial bit is missing: how did you define ==, eql? and hash in your 
class?  Did you define them?  If not, using Struct might help because 
that gives you those methods for free:

YourClass = Struct.new :name, :other_field do
   def method_you_need
   end
end

Then eql?, == and hash will be implemented in terms of "name" and 
"other_field".

Kind regards

	robert