#24705: Exception when negating Q object in annotate
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Reporter: karyon | 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 martsberger):
I am seeing this issue as well and the suggested workaround:
> For the moment, as a workaround, you can stop negating the clause and
switch the "then" and "default" values to then=True, default=False I
think.
Doesn't work for more complex Q objects. For example, a negated Q & a non-
negated Q.
{{{#!python
queryset =
SomeModel.objects.annotate(value=Case(When(Q(some__field=some_value) &
~Q(another__field=another_value))))
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/24705#comment:4>
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