[5.1.x] Refs #35405 -- Adjusted deprecation warning stacklevel in FieldCacheMixin.get_cache_name().

Backport of 39abd56a7fb1e2f735040df0fdfc08f57d91a49b from main.

django/db/models/fields/mixins.py

@@ -28,6 +28,7 @@ class FieldCacheMixin:
             f"Override {self.__class__.__qualname__}.cache_name instead of "
             "get_cache_name().",
             RemovedInDjango60Warning,
+            stacklevel=3,
         )
         return cache_name
 

docs/releases/5.1.1.txt

@@ -27,3 +27,7 @@ Bugfixes
 * Adjusted the deprecation warning ``stacklevel`` when using ``OS_OPEN_FLAGS``
   in :class:`~django.core.files.storage.FileSystemStorage` to correctly point
   to the offending call site (:ticket:`35326`).
+
+* Adjusted the deprecation warning ``stacklevel`` in
+  ``FieldCacheMixin.get_cache_name()`` to correctly point to the offending call
+  site (:ticket:`35405`).

tests/model_fields/test_mixins.py

@@ -34,9 +34,10 @@ class FieldCacheMixinTests(SimpleTestCase):
     # RemovedInDjango60Warning.
     def test_get_cache_name_deprecated(self):
         msg = "Override ExampleOld.cache_name instead of get_cache_name()."
-        with self.assertWarnsMessage(RemovedInDjango60Warning, msg):
+        with self.assertWarnsMessage(RemovedInDjango60Warning, msg) as ctx:
             result = ExampleOld().cache_name
         self.assertEqual(result, "example")
+        self.assertEqual(ctx.filename, __file__)
 
     def test_cache_name(self):
         result = Example().cache_name