#28621: Crash in QuerySet.annotate() with OuterRef
-------------------------------------+-------------------------------------
Reporter: Дилян Палаузов | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.11
(models, ORM) |
Severity: Normal | Resolution:
Keywords: QuerySet.extra | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Ben Davis):
I am also getting this error. Is there a workaround?
`AttributeError: 'ResolvedOuterRef' object has no attribute
'contains_aggregate'`
My query looks like this:
{{{#!python
class ProgramQuerySet(models.QuerySet):
def with_remaining_volunteers_needed(self):
sessions_query = (
Session.objects
.filter(program=OuterRef('id'))
.annotate(needed=OuterRef('volunteers_per_session') -
Count('volunteer_attendances'))
.order_by('-needed')
.values('needed')[:1]
)
return self.annotate(
volunteers_per_session=(F('num_student_seats') *
F('student_volunteer_ratio')),
needed=Subquery(sessions_query,
output_field=models.IntegerField())
)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/28621#comment:6>
Django <https://code.djangoproject.com/>
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