class S3RegionSiteSetting def self.valid_value?(val) all_values.include? val end def self.all_values @all_values ||= ['', 'us-east-1', 'us-west-1', 'us-west-2', 'ap-southeast-1', 'ap-southeast-2', 'ap-northeast-1', 'sa-east-1'].sort end end