Sorry, I did not specify.
I have been using 'Postgresql' with 'psycopg2 v.2.6.2'.
They gave me those results.
Also here is a sql query given from log:
SELECT "test_app_entity"."id", "test_app_entity"."due_date",
"test_app_entity"."interval", (("test_app_entity"."due_date" -
'2016-08-03T21:31:58.325549+00:00'::timestamptz) /
"test_app_entity"."interval") AS "ratio" FROM "test_app_entity";
args=(datetime.datetime(2016, 8, 3, 21, 31, 58, 325549, tzinfo=<UTC>),)
That is all that I can say at the moment.
On Thu, Aug 4, 2016 at 12:20 AM, Yoann Duriaud <yoann.duri...@gmail.com>
wrote:
> Thanks, unfortunately not so great on my side:
>
> I added in the query (forgetting the division for now):
>
> .annotate(ratio=ExpressionWrapper(F('due_date')-timezone.now(),
> DateTimeField()))
>
>
> which leads to the following statement in the query:
>
> ("contentstatus"."due_date" - 2016-08-03 21:05:10.743799+00:00) AS "ratio"
>
>
> This is not a valid SQL statement (at least for SQLite) and leads to the
> following error message when the query is evaluated:
>
> Exception Type:
>
> TypeError
> Exception Value:
>
>
> expected string or bytes-like object
>
>
> Any idea what I get this behavior?
>
> Yoann
>
>
> Le samedi 30 juillet 2016 22:41:21 UTC+2, Yoann Duriaud a écrit :
>>
>> 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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