[4.0.x] Refs #21755 -- Fixed createsuperuser crash for required foreign keys passed in options in interactive mode.

Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>

Backport of 4ff500f294 from main

django/contrib/auth/management/commands/createsuperuser.py

@@ -134,12 +134,12 @@ class Command(BaseCommand):
                                 self.stderr.write('Error: This field cannot be blank.')
                                 continue
                             user_data[field_name] = [pk.strip() for pk in input_value.split(',')]
-                        # Wrap any foreign keys in fake model instances
-                        if field.many_to_one:
-                            fake_user_data[field_name] = field.remote_field.model(input_value)
 
-                    if not field.many_to_many and field_name not in fake_user_data:
+                    if not field.many_to_many:
                         fake_user_data[field_name] = user_data[field_name]
+                    # Wrap any foreign keys in fake model instances.
+                    if field.many_to_one:
+                        fake_user_data[field_name] = field.remote_field.model(user_data[field_name])
 
                 # Prompt for a password if the model has one.
                 while PASSWORD_FIELD in user_data and user_data[PASSWORD_FIELD] is None:

tests/auth_tests/test_management.py

@@ -505,6 +505,32 @@ class CreatesuperuserManagementCommandTestCase(TestCase):
 
         test(self)
 
+    @override_settings(AUTH_USER_MODEL='auth_tests.CustomUserWithFK')
+    def test_fields_with_fk_via_option_interactive(self):
+        new_io = StringIO()
+        group = Group.objects.create(name='mygroup')
+        email = Email.objects.create(email='mymail@gmail.com')
+
+        @mock_inputs({'password': 'nopasswd'})
+        def test(self):
+            call_command(
+                'createsuperuser',
+                interactive=True,
+                username=email.pk,
+                email=email.email,
+                group=group.pk,
+                stdout=new_io,
+                stdin=MockTTY(),
+            )
+
+            command_output = new_io.getvalue().strip()
+            self.assertEqual(command_output, 'Superuser created successfully.')
+            u = CustomUserWithFK._default_manager.get(email=email)
+            self.assertEqual(u.username, email)
+            self.assertEqual(u.group, group)
+
+        test(self)
+
     @override_settings(AUTH_USER_MODEL='auth_tests.CustomUserWithM2m')
     def test_fields_with_m2m(self):
         new_io = StringIO()