#35235: ArrayAgg() doesn't return default when filter contains __in=[].
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Reporter: Per Carlsen | Owner: Sharon Woo
Type: Bug | Status: assigned
Component: contrib.postgres | Version: 5.0
Severity: Normal | Resolution:
Keywords: ArrayAgg | 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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Changes (by Mariusz Felisiak):
* cc: Simon Charette, Nick Pope (added)
* stage: Unreviewed => Accepted
* summary: ArrayAgg inconsistent return value when no results =>
ArrayAgg() doesn't return default when filter contains __in=[].
Comment:
I was able to reproduce the issue with a small models:
{{{#!python
class MyModel(models.Model):
pass
class MyOtherModel(models.Model):
mymodel = models.ForeignKey(MyModel, models.CASCADE)
for filter_value in ([], [-1]):
for default in ([], Value([])):
result = MyModel.objects.annotate(
annotated_ids=ArrayAgg(
"myothermodel__id",
filter=Q(
myothermodel__id__in=filter_value,
),
default=Value([]),
)
).first().annotated_ids
print(result, filter_value, default)
}}}
results
{{{
{} [] []
{} [] Value([])
[] [-1] []
[] [-1] Value([])
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/35235#comment:3>
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