Jim Fulton wrote:

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I plan to implement A soon if there are no objections.

Unless someone somehow convinced me to do D, I'll also add an assertion in the Transaction.join method to raise an error if a data manager joins more than once. Option A sounds sensible. It also means I won't have to change anything in the zope.sqlalchemy data manager.

Very cool. I was hoping non-ZODB-data-manager authors were paying attention. :)

If anyone knows of any other, I would appreciate someone forwarding this thread to them.

zope.sendmail and MaildropHost have data managers. I've seen some file-based things that was a data manager and a few others in people's BFG stacks, maybe they can pipe up and/or let the others of those wsgi components know. I'm also likely about to write one, but I'm dumb, so can't comment meaningfully on the options ;-) Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk