Fixed #10743 -- Allowed lookups for related fields in ModelAdmin.list_display.

Co-authored-by: Alex Garcia <me@alexoteiza.com>
Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>
Co-authored-by: Nina Menezes <https://github.com/nmenezes0>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/admin_utils/tests.py b/tests/admin_utils/tests.py
index 067b47198d..56d46324e0 100644
--- a/tests/admin_utils/tests.py
+++ b/tests/admin_utils/tests.py
@@ -137,6 +137,7 @@ class UtilsTests(SimpleTestCase):
             (simple_function, SIMPLE_FUNCTION),
             ("test_from_model", article.test_from_model()),
             ("non_field", INSTANCE_ATTRIBUTE),
+            ("site__domain", SITE_NAME),
         )
 
         mock_admin = MockModelAdmin()
@@ -294,6 +295,17 @@ class UtilsTests(SimpleTestCase):
 
         self.assertEqual(label_for_field(lambda x: "nothing", Article), "--")
         self.assertEqual(label_for_field("site_id", Article), "Site id")
+        # The correct name and attr are returned when `__` is in the field name.
+        self.assertEqual(label_for_field("site__domain", Article), "Site  domain")
+        self.assertEqual(
+            label_for_field("site__domain", Article, return_attr=True),
+            ("Site  domain", Site._meta.get_field("domain")),
+        )
+
+    def test_label_for_field_failed_lookup(self):
+        msg = "Unable to lookup 'site__unknown' on Article"
+        with self.assertRaisesMessage(AttributeError, msg):
+            label_for_field("site__unknown", Article)
 
         class MockModelAdmin:
             @admin.display(description="not Really the Model")