7 files changed, 61 insertions, 5 deletions
diff --git a/django/db/models/base.py b/django/db/models/base.py
index d53da600d7..7ac02f8a50 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -709,9 +709,17 @@ class Model(AltersData, metaclass=ModelBase):
 
     def _is_pk_set(self, meta=None):
         pk_val = self._get_pk_val(meta)
+
+        def _is_set(value):
+            return (
+                value is None
+                # Empty value when db_default is used.
+                or isinstance(value, DatabaseDefault)
+            )
+
         return not (
-            pk_val is None
-            or (isinstance(pk_val, tuple) and any(f is None for f in pk_val))
+            _is_set(pk_val)
+            or (isinstance(pk_val, tuple) and any(_is_set(f) for f in pk_val))
         )
 
     def get_deferred_fields(self):
diff --git a/tests/basic/tests.py b/tests/basic/tests.py
index ed655833e2..a81724b70f 100644
--- a/tests/basic/tests.py
+++ b/tests/basic/tests.py
@@ -554,6 +554,7 @@ class ModelTest(TestCase):
         cases = [
             Article(),
             Article(id=None),
+            PrimaryKeyWithDbDefault(),
         ]
         for case in cases:
             with self.subTest(case=case):
diff --git a/tests/composite_pk/models/__init__.py b/tests/composite_pk/models/__init__.py
index 5996ae33b0..ec5e914b41 100644
--- a/tests/composite_pk/models/__init__.py
+++ b/tests/composite_pk/models/__init__.py
@@ -1,8 +1,9 @@
-from .tenant import Comment, Post, Tenant, TimeStamped, Token, User
+from .tenant import Comment, Post, PostDbDefault, Tenant, TimeStamped, Token, User
 
 __all__ = [
     "Comment",
     "Post",
+    "PostDbDefault",
     "Tenant",
     "TimeStamped",
     "Token",
diff --git a/tests/composite_pk/models/tenant.py b/tests/composite_pk/models/tenant.py
index 65eb0feae8..4aff6d360e 100644
--- a/tests/composite_pk/models/tenant.py
+++ b/tests/composite_pk/models/tenant.py
@@ -55,6 +55,12 @@ class Post(models.Model):
     id = models.UUIDField(default=uuid.uuid4)
 
 
+class PostDbDefault(models.Model):
+    pk = models.CompositePrimaryKey("tenant_id", "id")
+    tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE, default=1)
+    id = models.IntegerField(db_default=1)
+
+
 class TimeStamped(models.Model):
     pk = models.CompositePrimaryKey("id", "created")
     id = models.SmallIntegerField(unique=True)
diff --git a/tests/composite_pk/tests.py b/tests/composite_pk/tests.py
index 264a1bb7c2..4284f9d627 100644
--- a/tests/composite_pk/tests.py
+++ b/tests/composite_pk/tests.py
@@ -17,7 +17,7 @@ from django.db.models import CompositePrimaryKey
 from django.forms import modelform_factory
 from django.test import TestCase
 
-from .models import Comment, Post, Tenant, TimeStamped, Token, User
+from .models import Comment, Post, PostDbDefault, Tenant, TimeStamped, Token, User
 
 
 class CommentForm(forms.ModelForm):
@@ -64,6 +64,12 @@ class CompositePKTests(TestCase):
         self.assertIsNone(user.id)
         self.assertIs(user._is_pk_set(), False)
 
+    def test_pk_not_set_db_default(self):
+        post = PostDbDefault(tenant=self.tenant)
+        self.assertEqual(post.tenant_id, self.tenant.pk)
+        self.assertIsNotNone(post.id)
+        self.assertIs(post._is_pk_set(), False)
+
     def test_hash(self):
         self.assertEqual(hash(User(pk=(1, 2))), hash((1, 2)))
         self.assertEqual(hash(User(tenant_id=2, id=3)), hash((2, 3)))
diff --git a/tests/inline_formsets/models.py b/tests/inline_formsets/models.py
index a090387c42..ccada27e4c 100644
--- a/tests/inline_formsets/models.py
+++ b/tests/inline_formsets/models.py
@@ -1,4 +1,5 @@
 from django.db import models
+from django.db.models.functions import UUID4
 
 
 class School(models.Model):
@@ -21,6 +22,27 @@ class Child(models.Model):
         ]
 
 
+class ParentUUIDPk(models.Model):
+    uuid = models.UUIDField(primary_key=True, db_default=UUID4(), editable=False)
+
+    class Meta:
+        required_db_features = {
+            "supports_uuid4_function",
+            "supports_expression_defaults",
+        }
+
+
+class ChildUUIDPk(models.Model):
+    parent = models.ForeignKey(ParentUUIDPk, models.CASCADE)
+    name = models.CharField(max_length=100)
+
+    class Meta:
+        required_db_features = {
+            "supports_uuid4_function",
+            "supports_expression_defaults",
+        }
+
+
 class Poet(models.Model):
     name = models.CharField(max_length=100)
 
diff --git a/tests/inline_formsets/tests.py b/tests/inline_formsets/tests.py
index eaabc350b4..78456ec514 100644
--- a/tests/inline_formsets/tests.py
+++ b/tests/inline_formsets/tests.py
@@ -1,7 +1,7 @@
 from django.forms.models import ModelForm, inlineformset_factory
 from django.test import TestCase, skipUnlessDBFeature
 
-from .models import Child, Parent, Poem, Poet, School
+from .models import Child, ChildUUIDPk, Parent, ParentUUIDPk, Poem, Poet, School
 
 
 class DeletionTests(TestCase):
@@ -113,6 +113,18 @@ class DeletionTests(TestCase):
             obj.save()
         self.assertEqual(school.child_set.count(), 1)
 
+    @skipUnlessDBFeature("supports_uuid4_function", "supports_expression_defaults")
+    def test_add_form_uuid_pk(self):
+        ChildFormSet = inlineformset_factory(ParentUUIDPk, ChildUUIDPk, fields=["name"])
+        data = {
+            "child_set-TOTAL_FORMS": "1",
+            "child_set-INITIAL_FORMS": "1",
+            "child_set-MAX_NUM_FORMS": "0",
+            "child_set-0-name": "child",
+        }
+        formset = ChildFormSet(data)
+        self.assertIs(formset.is_valid(), False)
+
 
 class InlineFormsetFactoryTest(TestCase):
     def test_inline_formset_factory(self):