From: Hugh Sasse <hgs@...>
Date: 2005-11-04T05:53:19+09:00
Subject: Re: DRb recycled objects.

On Fri, 4 Nov 2005, Kevin Brown wrote:

> I started this as a question but figured out the answer while I was 
> researching, so I'm posting this here for others that may have the same 
> problem.
> 
> The error I received from my code was as follows:
> 
> (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:375:in `_id2ref': 0xdbe53cf6 is 
> recycled object (RangeError)
        [stacktrace]
> 
> This was happening consistantly from the same place in the code.  I finally 
> tracked down the line that was giving me grief, and the issue was that I had 
> a method called Order#id.  When I was running the code without DRb, this 
> worked just fine, but calling id on a DRb proxy object will get you its DRb 
> object id.  I was returning this value, etc.
> 
> I fixed the problem by changing the method name to order_id, so I know how to 

You will now run into a problem when you port this to Rails :-)

[Rails uses the method #{name}_id to reference the primary key in table
"name" (cf Foreign Key)]

> avoid the error, but I would still like a little more explaination as to why 
> exactly this occurred so I can get DRb just that much clearer in my mind. :-)

-------------------------------------------------------------- Object#id
     obj.id    => fixnum
------------------------------------------------------------------------
     Soon-to-be deprecated version of +Object#object_id+.

uniquely identifies an object in the Ruby process.  I'm not sure how
DRb uses it, but probably to make sure the objects are distinct.
> 
> 
Thank you for flagging this up.
        HTH
        Hugh