#25772: ArrayField: incorrent len lookup
----------------------------------+-----------------
Reporter: mrAdm | Owner:
Type: Bug | Status: new
Component: contrib.postgres | Version: 1.8
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Models:
{{{
NullableIntegerArrayModel.objects.create(field=[])
NullableIntegerArrayModel.objects.create(field=[1])
NullableIntegerArrayModel.objects.create(field=[2, 3])
NullableIntegerArrayModel.objects.create(field=[20, 30, 40])
NullableIntegerArrayModel.objects.create(field=None)
}}}
Queries:
{{{
NullableIntegerArrayModel.objects.filter(field__len=0)
# return: empty queryset
NullableIntegerArrayModel.objects.filter(field__len__lt=2)
# return only one model (field=[1])
}}}
Reason:
PostgreSQL function array_length(ARRAY[]::int4[], 1) return null if array
empty.
The solution is to use a function PostgreSQL: COALESCE ().
{{{
SELECT * FROM ... WHERE COALESCE(array_length("field", 1), 0)=0
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/25772>
Django <https://code.djangoproject.com/>
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