I want to do something like this:
select ticket.*, (select count(*) from ticket_changes where
ticket_changes.ticket = ticket.id) as count
from ticket
at the ORM layer. My best stab at it was
>>> subquery = select([func.count('*').label('count')], from_obj=ticket_changes)
>>> session.query(Ticket, subquery.c.count).join(subquery).all()
but, .join seems to want to do an actual join in the FROM clause, and
I just want it to go into the SELECT clause as a correlated subq. The
docs don't have any examples of a correlated subquery from the ORM so
I'm starting to think maybe this isn't possible yet.
-Jonathan
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