From: Brian Candler <b.candler@...>
Date: 2009-12-10T00:21:26+09:00
Subject: Re: DRB class in array

Sausheong Chang wrote:
> I have a slightly different problem. I have an array stored in the 
> object:
> 
> class Room
>   include DRb::DRbUndumped
>   attr_accessor :name
>   attr_accessor :game
>   attr_accessor :observers
> 
>   def initialize(name=nil)
>     @game = nil
>     @observers = []
>     @name = name
>   end
> end
> 
> And the object is stored at the 'server'. At the 'client' I got the 
> object and is able to modify the @name instance variable at the 
> 'server'. However when I tried to add objects to the @observers array it 
> doesn't seem to appear at the 'server'. What could be wrong?

Try this:

  @observers = [].extend DRb::DRbUndumped

I think the same thing is happening one level down: although the Room 
instance stays where it is, when you make a call across the net to 
room.observers the return value is a *copy* of this array.

Another solution is to remove the attr_accessor for observers 
completely, and instead implement separate methods for what the client 
really needs to do - e.g. add an observer, remove an observer, iterate 
across observers.
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