Fixed #24146 -- Allowed model._meta.get_field() to be used after apps.models_ready

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/admin_checks/tests.py b/tests/admin_checks/tests.py
index 864609a6c7..7e1902105f 100644
--- a/tests/admin_checks/tests.py
+++ b/tests/admin_checks/tests.py
@@ -667,3 +667,20 @@ class SystemChecksTestCase(TestCase):
             )
         ]
         self.assertEqual(errors, expected)
+
+    def test_list_filter_works_on_through_field_even_when_apps_not_ready(self):
+        """
+        Ensure list_filter can access reverse fields even when the app registry
+        is not ready; refs #24146.
+        """
+        class BookAdminWithListFilter(admin.ModelAdmin):
+            list_filter = ['authorsbooks__featured']
+
+        # Temporarily pretending apps are not ready yet. This issue can happen
+        # if the value of 'list_filter' refers to a 'through__field'.
+        Book._meta.apps.ready = False
+        try:
+            errors = BookAdminWithListFilter.check(model=Book)
+            self.assertEqual(errors, [])
+        finally:
+            Book._meta.apps.ready = True