Feature: Enhanced templating for filename format (#7836)

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/documents/tests/test_migration_storage_path_template.py

@@ -0,0 +1,30 @@
+from documents.models import StoragePath
+from documents.tests.utils import TestMigrations
+
+
+class TestMigrateStoragePathToTemplate(TestMigrations):
+    migrate_from = "1054_customfieldinstance_value_monetary_amount_and_more"
+    migrate_to = "1055_alter_storagepath_path"
+
+    def setUpBeforeMigration(self, apps):
+        self.old_format = StoragePath.objects.create(
+            name="sp1",
+            path="Something/{title}",
+        )
+        self.new_format = StoragePath.objects.create(
+            name="sp2",
+            path="{{asn}}/{{title}}",
+        )
+        self.no_formatting = StoragePath.objects.create(
+            name="sp3",
+            path="Some/Fixed/Path",
+        )
+
+    def test_migrate_old_to_new_storage_path(self):
+        self.old_format.refresh_from_db()
+        self.new_format.refresh_from_db()
+        self.no_formatting.refresh_from_db()
+
+        self.assertEqual(self.old_format.path, "Something/{{ title }}")
+        self.assertEqual(self.new_format.path, "{{asn}}/{{title}}")
+        self.assertEqual(self.no_formatting.path, "Some/Fixed/Path")