Use only first item in array, when root element is an array

lib/adapter/serialize-test.js

@@ -5,6 +5,21 @@ import soapResponseFlightWithoutHead from '../../tests/helpers/soap5'
 
 import serialize from './serialize'
 
+// Setup
+
+const bossIdVendorSoap = `<?xml version="1.0" encoding="utf-8"?>
+<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
+  <soap:Body>
+    <CardNew xmlns="http://example.com/webservices/">
+      <customerkey>AD0B2E69-4640-FBF4-9CC7-0C713FDF3B11</customerkey>
+      <rfid>04793182CB4884</rfid>
+      <installationid>138</installationid>
+    </CardNew>
+  </soap:Body>
+</soap:Envelope>`
+
+// Tests
+
 test('should return soap string from object', async (t) => {
   const data = {
     GetPaymentMethodsResponse: {
@@ -36,6 +51,31 @@ test('should return soap string from object', async (t) => {
   t.deepEqual(ret, expected)
 })
 
+test('should use only first element when root element is an array', async (t) => {
+  const data = {
+    CardNew: [{
+      customerkey: 'AD0B2E69-4640-FBF4-9CC7-0C713FDF3B11',
+      rfid: '04793182CB4884',
+      installationid: '138'
+    }]
+  }
+  const endpoint = {
+    uri: 'http://api2.test/Economy/InvoiceOrder/V001/InvoiceService.asmx',
+    namespace: 'http://example.com/webservices/',
+    soap: { version: '1.2' }
+  }
+  const request = {
+    method: 'GET',
+    data,
+    endpoint
+  }
+  const expectedData = bossIdVendorSoap
+
+  const ret = await serialize(request)
+
+  t.deepEqual(ret.data, expectedData)
+})
+
 test('should set object at path', async (t) => {
   const data = {
     PaymentMethod: [

lib/adapter/serialize.js

@@ -38,11 +38,12 @@ const prepareProp = (element, props, key, namespaces) => {
   const prefix = extractNamespacePrefix(key)
   if (namespaces[prefix]) {
     const { [prefix]: namespace, ...rest } = namespaces
+    const theElement = (Array.isArray(element[key])) ? element[key][0] : element[key]
     return {
       ...props,
       [key]: prepareObject({
-        ...element[key],
-        _attributes: setAttribute(element[key], generateNamespaceKey(prefix), namespace)
+        ...theElement,
+        _attributes: setAttribute(theElement, generateNamespaceKey(prefix), namespace)
       }, rest)
     }
   }
@@ -60,7 +61,7 @@ const prepareObject = (element, namespaces) => {
     return element
   }
 
-  return Object.keys(element).reduce((el, key) => prepareProp(element, el, key, namespaces), {})
+  return Object.keys(element).reduce((props, key) => prepareProp(element, props, key, namespaces), {})
 }
 
 const prepareData = (data, path, namespace, { prefix = 'soap', version = '1.1' }) => {