-class CollectionNameOwnerUniqueOnlyNonExpired < ActiveRecord::Migration
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
+class CollectionNameOwnerUniqueOnlyNonExpired < ActiveRecord::Migration[4.2]
def find_index
indexes = ActiveRecord::Base.connection.indexes('collections')
name_owner_index = indexes.select do |index|