Savon 
Heavy metal Ruby SOAP client
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Installation
Savon is available through Rubygems and can be installed via:
$ gem install savon
Basic workflow
# Setting up a Savon::Client representing a SOAP service.
client = Savon::Client.new "http://service.example.com?wsdl"
client.wsdl.soap_actions
# => [:create_user, :get_user, :get_all_users]
# Executing a SOAP request to call a "getUser" action.
response = client.request :get_user do
soap.body = { :id => 1 }
end
response.to_hash
# => { :get_user_response => { :first_name => "The", :last_name => "Hoff" } }