Hi Yoann,
I am not sure exactly but believes you are on the right way.
Try improve your expression with ExpressionWrapper, as said here
<https://docs.djangoproject.com/en/1.9/ref/models/expressions/#using-f-with-annotations>
.
Probably the problem is that you use values of different types in your
expression.
Regards
On Sat, Jul 30, 2016 at 11:35 PM, Yoann Duriaud <yoann.duri...@gmail.com>
wrote:
> Hello,
> I would like to annotate a query with the following expression: ([Due
> Date] - [Now])/[Interval]. [Due Date] and [Interval] are fields from the
> database, while [Now] should be "equal" to timezone.now().
>
> So this would look like:
> .annotate(ratio=(F('due_date')-timezone.now())/F('Interval'))
>
> but this does not work. Does someone know how the expression should be
> written (if it is indeed feasible with Django ORM)?
>
> Thanks for your help!
>
> Yoann
>
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