#25937: Failure when using expressions.DateTime on NULL values and aggregating
-------------------------------------+-------------------------------------
Reporter: Thomas Recouvreux | Owner: Cheryl
| Yang
Type: Bug | Status: assigned
Component: Database layer | Version: 1.9
(models, ORM) |
Severity: Normal | Resolution:
Keywords: aggregate timezone | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
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Comment (by Aaron McMillin):
Here's a possible workaround for the failing case:
{{{
Potato.objects.annotate(
time=Coalesce(
DateTime('removed', 'month', timezone.UTC()),
Value(datetime.min),
).values('time').annotate(c=Count('pk'))
}}}
This replaces the NULL times with an easy to spot sentinel. if you were
already using `datetime.min`, you'll have to come up with something else.
--
Ticket URL: <https://code.djangoproject.com/ticket/25937#comment:10>
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