Hi,

I was creating a billing table that needs to be updated on repeated cycles 
as more information becomes available for a month, so I was following an 
Add Only scheme where I only add new rows, so we can keep track of the 
history of the month.  Now, when I show them a list of bills for the year, 
I only want to show them the most up to date for each month, so initially, 
I was doing something like:

session.query(Bill).filter_by(account_id=id).order_by(Bill.timestamp.desc()).group_by(Bill.date_begin)

Unfortunately, this doesn't compile a query in the read order or something 
comparable.  Second, I tried:

stmt = 
session.query(Bill).filter_by(account_id=id).order_by(Bill.timestamp.desc()).subquery()
session.query(stmt).group_by(Bill.date_begin)

This does get me the correct result, however, the problem is, for backwards 
compatibility, this does not actually return a list of Bill objects, but 
instead, it returns a list of KeyedTuples.  Is there a way to achieve what 
I want with sqlalchemy?

Thanks,
Jon

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