-class AddIndexToCollectionsAndMetadata < ActiveRecord::Migration
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
+class AddIndexToCollectionsAndMetadata < ActiveRecord::Migration[4.2]
def up
add_index :collections, :uuid, :unique => true
add_index :metadata, :uuid, :unique => true