On Feb 12, 2009, at 6:42 PM, Chris Withers wrote:
> > Hi All, > > With the model from my previous post, I'm looking to find the latest > Record for a particular Unit. > > Someone on #sqlalchemy suggested this: > > unit = session.query(Unit).filter(Unit.id==3).first() > > record = unit.records.order_by(Record.date.desc()).first() > > ...however, this gives me: > > AttributeError: 'InstrumentedList' object has no attribute 'order_by' > > How should I be looking to do this? the most straightforward, assuming you'd like to keep this in SQL, would be: session .query(Record).with_parent(unit).order_by(Record.date.desc()).first() alternatively, to do exactly what you stated above, i.e. unit.records.order_by()... etc., you can use a "dynamic" relation which establishes relations as Query objects. use lazy="dynamic" for this and see the examples in the "Large Collections" portion of the documentation. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
