here’s a patch: http://www.sqlalchemy.org/trac/ticket/2877
it’s quite short. I just don’t like the current contract of SelectBase, which
has many methods that don’t apply here, so might want to rework the base
classes.
On Nov 22, 2013, at 5:06 AM, Chris Withers <ch...@simplistix.co.uk> wrote:
> On 21/11/2013 19:25, Michael Bayer wrote:
>>
>> hoping you’ve already figured it out but otherwise I’m not entirely
>> following what the larger query you’re looking for would look like. I
>> doubt you need text() for anything.
>
> Okay, pseudo code that doesn't work:
>
> positions = something("""
> select instrument_id, sum(quantity) as quantity
> from transaction where
> account_id = :account_id and
> timestamp < :dt and
> group by instrument_id
> having sum(quantity) != 0
> """, dict(dt=date(2013, 1, 1), account_id='foo')).cte('positions')
>
> print session.query(Instrument, positions.c.quantity)\
> .select_from(Instrument)\
> .join(positions, Instrument.id=positions.instrument_id)\
> .all()
>
> (this latter query will likely have more stuff in it, not sure I used
> .select_from(...).join(...) correctly either ;-)
>
> Hope that illustrates what I'm after...
>
> Chris
>
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