#26517: Empty Querset Using Empty Queryset in ExpressionWrapper
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Reporter: srkunze | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.8
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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We use the ExpressionWrapper + annotate to annotate specific boolean
values to all queried instances like this (minimal working example):
{{{
editable_ones = ..... # another queryset
result =
MyModel.objects.annotate(editable=ExpressionWrapper(Q(pk__in=editable_child_folders),
output_field=BooleanField())
}}}
As soon as {{{editable_ones}}} is empty, {{{result}}} is also empty.
Reading the docs, I guess this is not desired behavior
(https://docs.djangoproject.com/en/1.9/ref/models/querysets/#annotate).
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Ticket URL: <https://code.djangoproject.com/ticket/26517>
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