Opened 9 years ago

Last modified 9 years ago

#25772 closed Bug

ArrayField: incorrent len lookup — at Initial Version

Reported by: mrAdm Owned by:
Component: contrib.postgres Version: 1.8
Severity: Normal Keywords:
Cc: Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

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

Change History (0)

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