update() and update_record() should accept callables:
def txn(record):
attrs = {}
if record.name == 'bob':
attrs['count'] = record.count + 1
elif record.name == 'alice':
attrs['count'] = record.count - 1
return attrs
#complex transactions
(db.posts.id>0).update(txn)
# simple transactions
(db.posts.id>0).update(count=lambda v: v+1)
The benefit of a complex transaction is that the developer can control
the order attributes are assigned and make complex decisions in side
the transaction. Simple transactions can use the shorthand notation
and put the callable inline.
Robin
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