On Dec 27, 2011, at 8:37 PM, Vlad K. wrote:
>
> Hi all.
>
>
> I need to select some rows where pkey is in a sequence. How do I order by
> that very sequence?
>
>
> images_all =
> session.query(AdImage).filter(AdImage.image_id.in_(images)).order_by( ?
> ).all()
>
>
> Postgresql backend.
typically with case():
order_by(
case([
(Adimage.id == 3, "A"),
(Adimage.id == 1, "B"),
(Adimage.id == 9, "C"),
])
)
unless you can use a simpler transformation on AdImage.id that converts it into
a sortable value.
The above can be generalized:
case([(AdImage.id == value, literal(index)) for index, value in
enumerate(images)])
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