What do I need to do to get Hash.from_xml() to work?

ruby xml hash activesupport

Just require 'active_support' doesn't do very much, you have to pull in the pieces sort of by hand. If you want all of ActiveSupport:

require 'active_support/all'

or if you just want the Hash extensions:

require 'active_support/core_ext/hash'

CodeHunter