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From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Fri, 20 Dec 2024 08:43:14 +0100
Subject: Refs #35844 -- Fixed
OtherModelFormTests.test_prefetch_related_queryset() test on Python 3.14+.
https://github.com/python/cpython/commit/5a23994a3dbee43a0b08f5920032f60f38b63071
Origin: backport, https://github.com/django/django/pull/18953.patch
Bug-Debian: https://bugs.debian.org/1122185
Last-Update: 2025-12-17
---
django/utils/version.py | 1 +
tests/model_forms/tests.py | 7 ++++++-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/django/utils/version.py b/django/utils/version.py
index 71ec70b..0144a05 100644
--- a/django/utils/version.py
+++ b/django/utils/version.py
@@ -18,6 +18,7 @@ PY310 = sys.version_info >= (3, 10)
PY311 = sys.version_info >= (3, 11)
PY312 = sys.version_info >= (3, 12)
PY313 = sys.version_info >= (3, 13)
+PY314 = sys.version_info >= (3, 14)
def get_version(version=None):
diff --git a/tests/model_forms/tests.py b/tests/model_forms/tests.py
index 8268032..0254393 100644
--- a/tests/model_forms/tests.py
+++ b/tests/model_forms/tests.py
@@ -23,6 +23,7 @@ from django.forms.models import (
from django.template import Context, Template
from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
from django.test.utils import isolate_apps
+from django.utils.version import PY314
from .models import (
Article,
@@ -2947,7 +2948,11 @@ class OtherModelFormTests(TestCase):
return ", ".join(c.name for c in obj.colours.all())
field = ColorModelChoiceField(ColourfulItem.objects.prefetch_related("colours"))
- with self.assertNumQueries(3): # would be 4 if prefetch is ignored
+ # CPython < 3.14 calls ModelChoiceField.__len__() when coercing to
+ # tuple. Python 3.14+ doesn't call __len__() and so .count()
+ # isn't called on the QuerySet. The following would trigger an extra
+ # query if prefetch were ignored.
+ with self.assertNumQueries(2 if PY314 else 3):
self.assertEqual(
tuple(field.choices),
(
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