Opened 7 years ago

Last modified 20 months ago

#20024 new Bug

QuerySet.exclude() does not work with lists containing a 'None' element.

Reported by:… Owned by: nobody
Component: Database layer (models, ORM) Version: 1.4
Severity: Normal Keywords:
Cc: Carsten Fuchs Triage Stage: Accepted
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by Luke Plant)

For example:

Entry.objects.exclude(foo__in=[None, 1])

It is supposed to return all items whose foo field is not None or 1, but it actually returns an empty query set.

Change History (6)

comment:1 Changed 7 years ago by Anssi Kääriäinen

Triage Stage: UnreviewedAccepted
Type: UncategorizedBug

This is a known failure (tested in queries/, test_col_not_in_list_containing_null()).

This is somewhat hard to fix as SQL's "somecol NOT IN lst_containing_null" is weird - it will always return False (well, technically UNKNOWN but this doesn't matter here), and this is what causes the bug.

It would be possible to check for presence of None in the given list. If present, remove it and add in a proper IS NULL check instead. But then a query like .exclude(somecol__in=qs_containig_null) would work differently from .exclude(somecol__in=list(qs_containig_null)). I guess that could be classified as known abstraction leak.

comment:2 Changed 7 years ago by Aymeric Augustin

Let's not be too smart... NULL in SQL is nowhere near as consistent as None in Python because of SQL's tri-valued boolean logic; we cannot hide this.

comment:3 Changed 7 years ago by Luke Plant

Description: modified (diff)

comment:4 Changed 5 years ago by Tim Graham

#13768 is a duplicate.

comment:5 Changed 5 years ago by Tim Graham

Summary: 'exclude' does not work with lists containing a 'None' element.QuerySet.exclude() does not work with lists containing a 'None' element.

comment:6 Changed 20 months ago by Carsten Fuchs

Cc: Carsten Fuchs added
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