Of course, that's only if you add or delete one record at a time. On Wednesday, January 15, 2014 12:09:11 AM UTC-5, Anthony wrote: > > db.thing._after_insert.append(lambda f,id: db(db.person.id >> ==f['owner_id']).update(total_items=len(db(db.thing.owner_id==f['owner_id']).select()))) >> from pprint import pprint >> db.thing._before_delete.append(lambda s: db(db.person.id >> ==s.select().first()['owner_id']).update(total_items=db(db.thing.owner_id==s.select().first()['owner_id']).count())) >> > > Note, to simplify, you can do .update(total_items=db.person.total_items + > 1) and .update(total_items=db.person.total_items - 1). > > Anthony >
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