Fixed #27438 -- Added the diffsettings --default option.

1 files changed, 10 insertions, 2 deletions

diff --git a/django/core/management/commands/diffsettings.py b/django/core/management/commands/diffsettings.py
index 7bae48c218..3a5ebcf845 100644
--- a/django/core/management/commands/diffsettings.py
+++ b/django/core/management/commands/diffsettings.py
@@ -18,16 +18,24 @@ class Command(BaseCommand):
             '--all', action='store_true', dest='all', default=False,
             help='Display all settings, regardless of their value. Default values are prefixed by "###".',
         )
+        parser.add_argument(
+            '--default', dest='default', metavar='MODULE', default=None,
+            help=(
+                "The settings module to compare the current settings against. Leave empty to "
+                "compare against Django's default settings."
+            ),
+        )
 
     def handle(self, **options):
         # Inspired by Postfix's "postconf -n".
-        from django.conf import settings, global_settings
+        from django.conf import settings, Settings, global_settings
 
         # Because settings are imported lazily, we need to explicitly load them.
         settings._setup()
 
         user_settings = module_to_dict(settings._wrapped)
-        default_settings = module_to_dict(global_settings)
+        default = options['default']
+        default_settings = module_to_dict(Settings(default) if default else global_settings)
 
         output = []
         for key in sorted(user_settings):