#26517: Empty Querset Using Empty Queryset in ExpressionWrapper
-------------------------------------+-------------------------------------
Reporter: srkunze | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by srkunze):
I did some further analysis:
{{{
MyModel.objects.annotate(editable=ExpressionWrapper(Q(pk__in=MyModel.objects.none()),
output_field=BooleanField())
}}}
{{{
MyModel.objects.annotate(editable=ExpressionWrapper(Q(pk__in=MyModel.objects.filter(pk=-1)),
output_field=BooleanField())
}}}
Both results differ.
{{{MyModel.objects.none()}}} forces the outer query to return an empty
QuerySet.
--
Ticket URL: <https://code.djangoproject.com/ticket/26517#comment:2>
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