Fix empty or multiple date values in csv (opensearch-project#293)

Signed-off-by: Zhongnan Su <szhongna@amazon.com>

server/routes/utils/__tests__/savedSearchReportHelper.test.ts

@@ -466,6 +466,59 @@ test('create report for data set with metadata fields', async () => {
   );
 }, 20000);
 
+test('create report with empty/one/multiple(list) date values', async () => {
+  const hits = [
+    hit(
+      { category: 'c1', customer_gender: 'Ma', order_date: [] },
+      { order_date: [] }
+    ),
+    hit(
+      {
+        category: 'c2',
+        customer_gender: 'le',
+        order_date: ['2021-12-16T14:04:55'],
+      },
+      { order_date: ['2021-12-16T14:04:55'] }
+    ),
+    hit(
+      {
+        category: 'c3',
+        customer_gender: 'he',
+        order_date: ['2021-12-17T14:04:55', '2021-12-18T14:04:55'],
+      },
+      { order_date: ['2021-12-17T14:04:55', '2021-12-18T14:04:55'] }
+    ),
+    hit(
+      {
+        category: 'c4',
+        customer_gender: 'te',
+        order_date: '2021-12-19T14:04:55',
+      },
+      { order_date: ['2021-12-19T14:04:55'] }
+    ),
+  ];
+  const client = mockOpenSearchClient(
+    hits,
+    '"category", "customer_gender", "order_date"'
+  );
+  const { dataUrl } = await createSavedSearchReport(
+    input,
+    client,
+    mockDateFormat,
+    ',',
+    undefined,
+    mockLogger
+  );
+
+  expect(dataUrl).toEqual(
+    'category,customer_gender,order_date\n' +
+      'c1,Ma,[]\n' +
+      'c2,le,"[""12/16/2021 2:04:55.000 pm""]"\n' +
+      'c3,he,"[""12/17/2021 2:04:55.000 pm"",""12/18/2021 2:04:55.000 pm""]"\n' +
+      'c4,te,12/19/2021 2:04:55.000 pm'
+  );
+}, 20000);
+
 /**
  * Mock Elasticsearch client and return different mock objects based on endpoint and parameters.
  */
@@ -588,8 +641,9 @@ function mockIndexSettings() {
   `);
 }
 
-function hit(kv: any) {
+function hit(source_kv: any, fields_kv = {}) {
   return {
-    _source: kv,
+    _source: source_kv,
+    fields: fields_kv,
   };
 }

server/routes/utils/dataReportHelpers.ts

@@ -118,11 +118,23 @@ export const getOpenSearchData = (
     for (let data of valueRes.hits) {
       const fields = data.fields;
       // get all the fields of type date and format them to excel format
-      for (let dateType of report._source.dateFields) {
-        if (data._source[dateType]) {
-          data._source[dateType] = moment(fields[dateType][0]).format(
-            dateFormat
-          );
+      for (let dateField of report._source.dateFields) {
+        const dateValue = data._source[dateField];
+        if (dateValue && dateValue.length !== 0) {
+          if (dateValue instanceof Array) {
+            // loop through array
+            dateValue.forEach((element, index) => {
+              data._source[dateField][index] = moment(
+                fields[dateField][index]
+              ).format(dateFormat);
+            });
+          } else {
+            // The fields response always returns an array of values for each field
+            // https://www.elastic.co/guide/en/elasticsearch/reference/master/search-fields.html#search-fields-response
+            data._source[dateField] = moment(fields[dateField][0]).format(
+              dateFormat
+            );
+          }
         }
       }
       delete data['fields'];