[4.2.x] Fixed #34320 -- Make sure constraints names are obtained from truncated columns names.

Backport of 6bdc3c58b6 from main

tests/schema/tests.py

@@ -13,6 +13,7 @@ from django.db import (
     OperationalError,
     connection,
 )
+from django.db.backends.utils import truncate_name
 from django.db.models import (
     CASCADE,
     PROTECT,
@@ -2072,6 +2073,36 @@ class SchemaTests(TransactionTestCase):
         with self.assertRaises(IntegrityError):
             NoteRename.objects.create(detail_info=None)
 
+    @isolate_apps("schema")
+    def test_rename_field_with_check_to_truncated_name(self):
+        class AuthorWithLongColumn(Model):
+            field_with_very_looooooong_name = PositiveIntegerField(null=True)
+
+            class Meta:
+                app_label = "schema"
+
+        self.isolated_local_models = [AuthorWithLongColumn]
+        with connection.schema_editor() as editor:
+            editor.create_model(AuthorWithLongColumn)
+        old_field = AuthorWithLongColumn._meta.get_field(
+            "field_with_very_looooooong_name"
+        )
+        new_field = PositiveIntegerField(null=True)
+        new_field.set_attributes_from_name("renamed_field_with_very_long_name")
+        with connection.schema_editor() as editor:
+            editor.alter_field(AuthorWithLongColumn, old_field, new_field, strict=True)
+
+        new_field_name = truncate_name(
+            new_field.column, connection.ops.max_name_length()
+        )
+        constraints = self.get_constraints(AuthorWithLongColumn._meta.db_table)
+        check_constraints = [
+            name
+            for name, details in constraints.items()
+            if details["columns"] == [new_field_name] and details["check"]
+        ]
+        self.assertEqual(len(check_constraints), 1)
+
     def _test_m2m_create(self, M2MFieldClass):
         """
         Tests M2M fields on models during creation