On Mar 30, 2010, at 2:47 AM, Kalium wrote:
> Hi,
> I've had a look through the docs and a quick look through the forum
> here, and haven't been able to solve my problem. I'm using 0.4
>
> The following works as expected.
>
> q =
> System.query().join('activity').group_by(model.System.id).add_column(func.max(Activity.id))
>
> The add_column() recognises that the activity table is already joined.
> and thus does not add it to the tables in the 'FROM' clause.
>
>
> However, the following does not work. The only difference is that now
> the joined table (activity) is aliased.
>
> q =
> System.query().join('activity',aliased=True).group_by(model.System.id).add_column(func.max(Activity.id))
>
> add_column() does not recognise the aliased activity table and the
> from clause now looks something like 'FROM system,activity', whereas
> it should be joined.
>
> What are my best solutions?
in 0.4 you'd need to use SQL-level Table and alias() objects to achieve the
desired effect. in 0.5 and above, you'd use aliased(Activity) as your entity.
the "aliased=True" option only affects subsequent filter/order_by/group_by
calls.
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