#32684: Annotate query with Subquery with None value cannot be reliably filtered
(or excluded)
-------------------------------------+-------------------------------------
Reporter: Gerben | Owner: nobody
Morsink |
Type: Bug | Status: new
Component: Database | Version: 3.1
layer (models, ORM) |
Severity: Normal | Keywords: annotate, Subquery
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Let's say I have the following query
{{{
last_location = Subquery(PersonLocation.objects.filter(
person=OuterRef('id'),
departure_date=None).order_by('-arrival_date').values('location')[:1])
persons1 =
Person.objects_with_inactive.annotate(current_location=last_location)
}}}
Where PersonLocation is the table connecting the Person to a Location (to
keep track of the location history of a person).
And further in the code I do:
{{{
persons2 = persons1.exclude(current_location=location.id)
}}}
This will always return an empty queryset. Even if in persons1 there are
person objects that have `current_location = None` annotated.
This is very counter-intuitive, right?
I'm also not aware of a way to fix this. I tried
`persons1.filter(~Q(current_location=location.id))`, but the result is the
same.
--
Ticket URL: <https://code.djangoproject.com/ticket/32684>
Django <https://code.djangoproject.com/>
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