From ceea86baa36b91d0002911770340a2d7bd4f64b7 Mon Sep 17 00:00:00 2001
From: Jacob Walls <jacobtylerwalls@gmail.com>
Date: Sat, 4 May 2024 17:11:07 -0400
Subject: [PATCH] Fixed #35425 -- Avoided INSERT with force_update and explicit
 pk.

Affected models where the primary key field is defined with a
default or db_default, such as UUIDField.
---
 django/db/models/base.py | 1 +
 tests/basic/tests.py     | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/django/db/models/base.py b/django/db/models/base.py
index e68baf4e576..cd300e47bce 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -1088,6 +1088,7 @@ class Model(AltersData, metaclass=ModelBase):
         if (
             not raw
             and not force_insert
+            and not force_update
             and self._state.adding
             and (
                 (meta.pk.default and meta.pk.default is not NOT_PROVIDED)
diff --git a/tests/basic/tests.py b/tests/basic/tests.py
index bda59d82fa8..38fb9ca2003 100644
--- a/tests/basic/tests.py
+++ b/tests/basic/tests.py
@@ -186,6 +186,12 @@ class ModelInstanceCreationTests(TestCase):
         with self.assertNumQueries(1):
             PrimaryKeyWithDefault().save()
 
+    def test_save_primary_with_default_force_update(self):
+        # An UPDATE attempt is made if explicitly requested.
+        obj = PrimaryKeyWithDefault.objects.create()
+        with self.assertNumQueries(1):
+            PrimaryKeyWithDefault(uuid=obj.pk).save(force_update=True)
+
     def test_save_primary_with_db_default(self):
         # An UPDATE attempt is skipped when a primary key has db_default.
         with self.assertNumQueries(1):