Okay, I have another question related to this.
Now that I have max_order defined, I want to do a query on it (give me
the users whose max_order==5). My code is
max_orders_by_user =
select([func.max(orders.c.order_id).label('order_id')],
group_by=[orders.c.user_id]).alias('max_orders_by_user')
errr, the relations that mapper setup can feed into select_by would
include all the attributes you have on Order, which does not include
max_order_id. youve got two relations that both point to an Order
relation, so select_by is more or less out at that point since it can
only be given order_id,
Jonathan Ellis wrote:
o2 = orders.select().alias('o2')
max_orders = orders.select(orders.c.order_id==max_order_id).alias('max_orders')
youre not really showing me what you did there fully so its hard for me
to tell how you got that result.
- I take it SA doesn't really support subselects
Jonathan Ellis wrote:
Hmm, another undocumented option... :) How is a viewonly relation on
the class different from a relation on a non_primary mapper?
oh theyre both documented. a non_primary mapper means, you load
instances from the DB using an alternate table/selectable. once those
