Re: Query annotation with date difference

Hi Yoann,

I am not sure exactly but believes you are on the right way.

Try improve your expression with ExpressionWrapper, as said here.

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.duriaud@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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