I'm writing a little client using Ruby and Savon. The interface changed significantly from version 0.7 to 0.8.x. All my calls don't work anymore :-(. How can I pass on a local member variable. Please see the example, @userName and @userPassword are not defined within the block.

begin
    @response = @authentication_svc.request :wsdl, "AuthenticateUser" do  
        http.headers["SOAPAction"] = "AuthenticateUser"  
        soap.body = "#{@userName}#{@passwd}"  
    end  
rescue Savon::SOAP::Fault => e  
    @last_soap_error = e.message  
end