fix(#10298): update device_by_user to use built-in reduce [DO NOT MERGE]

api/src/services/export/user-devices.js

@@ -13,7 +13,7 @@ const getBrowser = (userAgent) => {
 };
 
 module.exports = async () => {
-  const { rows } = await db.medicUsersMeta.query('users-meta/device_by_user', { group: true });
+  const { rows } = await db.medicUsersMeta.query('users-meta/device_by_user', { group_level: 2 });
   return rows.map(doc => {
     const [user, deviceId] = doc.key;
     const date = doc.value.date;

api/tests/mocha/services/export-data.spec.js

@@ -437,6 +437,7 @@ describe('Export Data Service', () => {
           user: 'min-data'
         }
       ]);
+      db.medicUsersMeta.query.calledOnceWith('users-meta/device_by_user', { group_level: 2 }).should.equal(true);
     });
   });
 

ddocs/users-meta-db/users-meta/views/device_by_user/map.js

@@ -12,9 +12,10 @@ function(doc) {
       var string = number.toString();
       return string.length === 2 ? string : '0' + string;
     };
+    const date = doc.metadata.year + '-' + pad(doc.metadata.month) + '-' + pad(doc.metadata.day);
 
-    emit([doc.metadata.user, doc.metadata.deviceId], {
-      date: doc.metadata.year + '-' + pad(doc.metadata.month) + '-' + pad(doc.metadata.day),
+    emit([doc.metadata.user, doc.metadata.deviceId, date], {
+      date: date,
       id: doc._id,
       device: {
         userAgent: doc.device && doc.device.userAgent,

ddocs/users-meta-db/users-meta/views/device_by_user/reduce

@@ -0,0 +1 @@
+_last