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Code Issues 32 Releases Wiki Activity

Fixed #36388 -- Made QuerySet.union() return self when called with no arguments.

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Regression in 9cb8baa0c4fa2c10789c5c8b65f4465932d4d172.
Thank you to Antoine Humeau for the report and Simon Charette for the review.
This commit is contained in:
Colleen Dunlap 2025-05-15 15:41:59 -04:00 committed by Sarah Boyce
parent 1ba5fe19ca
commit 802baf5da5
4 changed files with 13 additions and 0 deletions
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1
AUTHORS
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@ -239,6 +239,7 @@ answer newbie questions, and generally made Django that much better:
Claude Paroz <claude@2xlibre.net> Claude Paroz <claude@2xlibre.net>
Clifford Gama <cliffygamy@gmail.com> Clifford Gama <cliffygamy@gmail.com>
Clint Ecker Clint Ecker
Colleen Dunlap <https://medium.com/@colleen85052>
colin@owlfish.com colin@owlfish.com
Colin Wood <cwood06@gmail.com> Colin Wood <cwood06@gmail.com>
Collin Anderson <cmawebsite@gmail.com> Collin Anderson <cmawebsite@gmail.com>

2
django/db/models/query.py
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@ -1550,6 +1550,8 @@ class QuerySet(AltersData):
if len(qs) == 1: if len(qs) == 1:
return qs[0] return qs[0]
return qs[0]._combinator_query("union", *qs[1:], all=all) return qs[0]._combinator_query("union", *qs[1:], all=all)
elif not other_qs:
return self
return self._combinator_query("union", *other_qs, all=all) return self._combinator_query("union", *other_qs, all=all)
def intersection(self, *other_qs): def intersection(self, *other_qs):

3
docs/releases/5.2.2.txt
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@ -15,3 +15,6 @@ Bugfixes
* Fixed a bug in Django 5.2 where subqueries using ``"pk"`` to reference models * Fixed a bug in Django 5.2 where subqueries using ``"pk"`` to reference models
with a ``CompositePrimaryKey`` failed to raise ``ValueError`` when too many with a ``CompositePrimaryKey`` failed to raise ``ValueError`` when too many
or too few columns were selected (:ticket:`36392`). or too few columns were selected (:ticket:`36392`).
* Fixed a regression in Django 5.2 that caused a crash when no arguments were
passed into ``QuerySet.union()`` (:ticket:`36388`).

7
tests/queries/test_qs_combinators.py
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@ -88,6 +88,13 @@ class QuerySetSetOperationTests(TestCase):
qs3 = qs1.union(qs2) qs3 = qs1.union(qs2)
self.assertNumbersEqual(qs3[:1], [0]) self.assertNumbersEqual(qs3[:1], [0])
def test_union_empty_slice(self):
qs = Number.objects.union()
self.assertNumbersEqual(qs[:1], [0])
qs = Number.objects.union(all=True)
self.assertNumbersEqual(qs[:1], [0])
self.assertNumbersEqual(qs.order_by("num")[0:], list(range(0, 10)))
def test_union_all_none_slice(self): def test_union_all_none_slice(self):
qs = Number.objects.filter(id__in=[]) qs = Number.objects.filter(id__in=[])
with self.assertNumQueries(0): with self.assertNumQueries(0):