[3.0.x] Fixed #31155 -- Fixed a system check for the longest choice when a named group contains only non-string values.

Regression in b6251956b69512bf230322bd7a49b629ca8455c6.

Thanks Murat Guchetl for the report.
Backport of 6f7998adc784032f4b8918ca2eea27537ea4cbbe from master

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/invalid_models_tests/test_ordinary_fields.py b/tests/invalid_models_tests/test_ordinary_fields.py
index 2ef0907a6a..6f91a74e92 100644
--- a/tests/invalid_models_tests/test_ordinary_fields.py
+++ b/tests/invalid_models_tests/test_ordinary_fields.py
@@ -1,4 +1,5 @@
 import unittest
+import uuid
 
 from django.core.checks import Error, Warning as DjangoWarning
 from django.db import connection, models
@@ -768,3 +769,20 @@ class TextFieldTests(TestCase):
                 id='fields.W162',
             )
         ])
+
+
+@isolate_apps('invalid_models_tests')
+class UUIDFieldTests(TestCase):
+    def test_choices_named_group(self):
+        class Model(models.Model):
+            field = models.UUIDField(
+                choices=[
+                    ['knights', [
+                        [uuid.UUID('5c859437-d061-4847-b3f7-e6b78852f8c8'), 'Lancelot'],
+                        [uuid.UUID('c7853ec1-2ea3-4359-b02d-b54e8f1bcee2'), 'Galahad'],
+                    ]],
+                    [uuid.UUID('25d405be-4895-4d50-9b2e-d6695359ce47'), 'Other'],
+                ],
+            )
+
+        self.assertEqual(Model._meta.get_field('field').check(), [])