Rails Convention for "Record Pseudo Locking" on Multi-User Systems

We are writing an order processing system, where we will display a list of
orders for clerks to process. Obviously we don't want two people working on
the same order. In other systems we've put a LOCKED_BY column in the
database which is set on entering the edit screen and unset on saving.

But is there a Rails convention, or Rails way, for doing this (before we go
off and write our own code) ?

Thanks

Phil Nelson

race conditions: you want to investigate optimistic and pessimistic
locking and transactions:

http://api.rubyonrails.com/classes/ActiveRecord/Locking.html