iso8601_serializer.rb Ruby on Rails 5.1.2 iso8601_serializer.rb activesupport/lib/active_support/duration/iso8601_serializer.rb on GitHub Last modified: 2017-07-12 08:38:53 -0700 Required Files active_support/core_ext/object/blank active_support/core_ext/hash/transform_values Namespace MODULE ActiveSupport CLASS ActiveSupport::Duration