-class AddUniqueNameConstraints < ActiveRecord::Migration
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
+class AddUniqueNameConstraints < ActiveRecord::Migration[4.2]
def change
# Ensure uniqueness before adding constraints.
["collections", "pipeline_templates", "groups"].each do |table|