#25177: Filter reference field on model to a date difference raise a TypeError
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Reporter: MounirMesselmeni | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by jarshwah):
This ticket seems really familiar, but I can't seem to find a duplicate at
the moment. I'll keep hunting for it. In the mean time, there's a
workaround for what you want to do:
{{{
Product.objects.annotate(days=ExpressionWrapper(F('start_date')-F('signed_date'),
output_field=DurationField())).filter(days__lte=2)
}}}
That works on Postgres at least, I'm not sure how other backends handle
it.
I think `Combinable._combine()` may need special handling for `date -
date` producing durations though.
--
Ticket URL: <https://code.djangoproject.com/ticket/25177#comment:2>
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