When you're playing with SOAP in Rails, I think you want to use
ActionWebService. See:
http://rails.rubyonrails.com/classes/ActionWebService/Client/Soap.html

For Rails specific questions such as this, try the Rails mailing list,
at http://lists.rubyonrails.org/mailman/listinfo/rails or
http://www.ruby-forum.com/forum/3