How to use the saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer function in saml

$scope.samlServerSignature = true;
            } else {
                $scope.samlServerSignature = false;

            }
        }
        if ($scope.client.attributes["saml.server.signature.keyinfo.ext"]) {
            if ($scope.client.attributes["saml.server.signature.keyinfo.ext"] == "true") {
                $scope.samlServerSignatureEnableKeyInfoExtension = true;
            } else {
                $scope.samlServerSignatureEnableKeyInfoExtension = false;
            }
        }
        if ($scope.client.attributes['saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer'] === 'NONE') {
            $scope.samlXmlKeyNameTranformer = $scope.xmlKeyNameTranformers[0];
        } else if ($scope.client.attributes['saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer'] === 'KEY_ID') {
            $scope.samlXmlKeyNameTranformer = $scope.xmlKeyNameTranformers[1];
        } else if ($scope.client.attributes['saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer'] === 'CERT_SUBJECT') {
            $scope.samlXmlKeyNameTranformer = $scope.xmlKeyNameTranformers[2];
        }
        if ($scope.client.attributes["saml.assertion.signature"]) {
            if ($scope.client.attributes["saml.assertion.signature"] == "true") {
                $scope.samlAssertionSignature = true;
            } else {
                $scope.samlAssertionSignature = false;
            }
        }
        if ($scope.client.attributes["saml.client.signature"]) {
            if ($scope.client.attributes["saml.client.signature"] == "true") {
                $scope.samlClientSignature = true;
            } else {
                $scope.samlClientSignature = false;

$scope.changeSamlSigKeyNameTranformer = function() {
        $scope.clientEdit.attributes['saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer'] = $scope.samlXmlKeyNameTranformer;
    };