update sets

src/plugins/vis_type_timelion/server/series_functions/worldbank_indicators.js

@@ -53,20 +53,25 @@ export default new Datasource('worldbank_indicators', {
     });
 
     const countries = config.country.split(':');
-    const seriesLists = _.map(countries, function (country) {
+    const seriesListSets = _.map(countries, function (country) {
       const code = 'country/' + country + '/indicator/' + config.indicator;
       const wbArgs = [code];
       wbArgs.byName = { code: code };
       return worldbank.timelionFn(wbArgs, tlConfig);
     });
 
-    return Promise.all(seriesLists, function (seriesList) {
-      return seriesList.list[0];
-    }).then(function (list) {
-      return {
-        type: 'seriesList',
-        list: list,
-      };
-    });
+    return Promise.all(seriesListSets)
+      .then((seriesLists) => {
+        return seriesLists.reduce((acc, seriesList) => {
+          acc.push(seriesList.list[0]);
+          return acc;
+        }, []);
+      })
+      .then(function (list) {
+        return {
+          type: 'seriesList',
+          list: list,
+        };
+      });
   },
 });