Using Savon and nokogiri to make a Soap Request - ruby-on-rails

Question

A sample request that I am trying to make looks like this:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<GetList xmlns="http://tempuri.org/">
<listRequest i:type="b:NpsListRequest" xmlns:a="http://schemas.datacontract.org/2004/07/Services.List" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:b="http://schemas.datacontract.org/2004/07/Services.List.Strategies">
<a:id>1</a:id>
</listRequest>
</GetList>
</s:Body>
</s:Envelope>
I can replicate that exactly, using Nokogiri, like so:
builder = Nokogiri::XML::Builder.new do |xml|
xml['s'].Envelope('xmlns:s' => "http://schemas.xmlsoap.org/soap/envelope/") {
xml['s'].Body {
xml.GetList('xmlns' => "http://tempuri.org/") {
xml.listRequest('i:type' => "b:NpsListRequest", 'xmlns:a' => "http://schemas.datacontract.org/2004/07/Services.List", 'xmlns:i' => "http://www.w3.org/2001/XMLSchema-instance", 'xmlns:b' => "http://schemas.datacontract.org/2004/07/Services.List.Strategies") {
xml['a'].id(1)
}
}
}
}
end
builder.to_xml
Then, I build my soap_client using Savon:
def soap_client
soap_client = Savon.client(
wsdl: "http://1.1.1.1/Api.svc?wsdl", #PLE
headers: {"Authorization" => "Basic"},
basic_auth: ['user', 'password'],
env_namespace: :soapenv,
namespace_identifier: :ser,
ssl_verify_mode: :none,
log: true,
:pretty_print_xml => true
)
end
Now, I need to make a :get_list call that looks like the above sample request.
soap_client.operations returns this:
[:get_list] So I know I'm authenticated and the client is working correctly.
I can't figure out how to actually make the :get_list call.
I would like something simple where I don't even have to use Nokogiri to build my own xml, like this:
soap_client.call :get_list, message: {id => 1}
But that doesn't seem to be a feasible solution. Any thoughts on how I can pass the XML I'm building using Nokogiri through to the :get_list call for my soap_client? I am open to other suggestions as well.