deprecation warnings for the global settings

django/conf/__init__.py

@@ -27,6 +27,10 @@ STATICFILES_STORAGE_ALIAS = "staticfiles"
 FORMS_URLFIELD_ASSUME_HTTPS_DEPRECATED_MSG = (
     "The FORMS_URLFIELD_ASSUME_HTTPS transitional setting is deprecated."
 )
+DEFAULT_TABLESPACE_DEPRECATED_MSG = "The DEFAULT_TABLESPACE setting is deprecated."
+DEFAULT_INDEX_TABLESPACE_DEPRECATED_MSG = (
+    "The DEFAULT_INDEX_TABLESPACE setting is deprecated."
+)
 
 
 class SettingsReference(str):
@@ -192,6 +196,18 @@ class Settings:
                 RemovedInDjango60Warning,
             )
 
+        if self.is_overridden("DEFAULT_TABLESPACE"):
+            warnings.warn(
+                DEFAULT_TABLESPACE_DEPRECATED_MSG,
+                RemovedInDjango60Warning,
+            )
+
+        if self.is_overridden("DEFAULT_INDEX_TABLESPACE"):
+            warnings.warn(
+                DEFAULT_INDEX_TABLESPACE_DEPRECATED_MSG,
+                RemovedInDjango60Warning,
+            )
+
         if hasattr(time, "tzset") and self.TIME_ZONE:
             # When we can, attempt to validate the timezone. If we can't find
             # this file, no check happens and it's harmless.
@@ -241,6 +257,16 @@ class UserSettingsHolder:
                 FORMS_URLFIELD_ASSUME_HTTPS_DEPRECATED_MSG,
                 RemovedInDjango60Warning,
             )
+        if name == "DEFAULT_TABLESPACE":
+            warnings.warn(
+                DEFAULT_TABLESPACE_DEPRECATED_MSG,
+                RemovedInDjango60Warning,
+            )
+        if name == "DEFAULT_INDEX_TABLESPACE":
+            warnings.warn(
+                DEFAULT_INDEX_TABLESPACE_DEPRECATED_MSG,
+                RemovedInDjango60Warning,
+            )
         super().__setattr__(name, value)
 
     def __delattr__(self, name):

tests/model_indexes/tests.py

@@ -3,8 +3,15 @@ from unittest import mock
 from django.conf import settings
 from django.db import connection, models
 from django.db.models.functions import Lower, Upper
-from django.test import SimpleTestCase, TestCase, override_settings, skipUnlessDBFeature
+from django.test import (
+    SimpleTestCase,
+    TestCase,
+    ignore_warnings,
+    override_settings,
+    skipUnlessDBFeature,
+)
 from django.test.utils import isolate_apps
+from django.utils.deprecation import RemovedInDjango60Warning
 
 from .models import Book, ChildModel1, ChildModel2
 
@@ -305,9 +312,10 @@ class SimpleIndexesTests(SimpleTestCase):
         )
 
 
-@override_settings(DEFAULT_TABLESPACE=None)
+@ignore_warnings(category=RemovedInDjango60Warning)
 class IndexesTests(TestCase):
     @skipUnlessDBFeature("supports_tablespaces")
+    @override_settings(DEFAULT_TABLESPACE=None)
     def test_db_tablespace(self):
         editor = connection.schema_editor()
         # Index with db_tablespace attribute.
@@ -346,6 +354,7 @@ class IndexesTests(TestCase):
         self.assertIn('"idx_tbls"', str(index.create_sql(Book, editor)).lower())
 
     @skipUnlessDBFeature("supports_tablespaces")
+    @override_settings(DEFAULT_TABLESPACE=None)
     def test_func_with_tablespace(self):
         # Functional index with db_tablespace attribute.
         index = models.Index(