what's solving your problem is a mutual exclusion (called Mutex). you
can try google/wiki to learn more about threading and mutex.

easy to implement:

class Document < ActiveRecord::Base
  include 'Mutex_m'
  ...

look here and check out the synchronize method:
http://noobkit.com/show/ruby/ruby/standard-library/mutex_m.html

hope this helps.

On 28 Okt., 01:02, shagymoe <[EMAIL PROTECTED]> wrote:
> > What about a find using :first and :order by version descending to limit
> > what you have to process...
>
> I think two queries at the same time would still return the same
> version.
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