Fixed #30876 -- Moved classproperty() decorator to the django.utils.functional.

tests/utils_tests/test_functional.py

@@ -1,7 +1,7 @@
 from unittest import mock
 
 from django.test import SimpleTestCase
-from django.utils.functional import cached_property, lazy
+from django.utils.functional import cached_property, classproperty, lazy
 
 
 class FunctionalTests(SimpleTestCase):
@@ -218,3 +218,39 @@ class FunctionalTests(SimpleTestCase):
         with mock.patch.object(__proxy__, '__prepare_class__') as mocked:
             lazified()
             mocked.assert_not_called()
+
+    def test_classproperty_getter(self):
+        class Foo:
+            foo_attr = 123
+
+            def __init__(self):
+                self.foo_attr = 456
+
+            @classproperty
+            def foo(cls):
+                return cls.foo_attr
+
+        class Bar:
+            bar = classproperty()
+
+            @bar.getter
+            def bar(cls):
+                return 123
+
+        self.assertEqual(Foo.foo, 123)
+        self.assertEqual(Foo().foo, 123)
+        self.assertEqual(Bar.bar, 123)
+        self.assertEqual(Bar().bar, 123)
+
+    def test_classproperty_override_getter(self):
+        class Foo:
+            @classproperty
+            def foo(cls):
+                return 123
+
+            @foo.getter
+            def foo(cls):
+                return 456
+
+        self.assertEqual(Foo.foo, 456)
+        self.assertEqual(Foo().foo, 456)