code design

config.json

@@ -10,12 +10,12 @@
     "http://localhost"
   ],
   "database": {
-    "host": "localhost",
+    "host": "database",
     "port": 27017,
     "name": "webplay"
   },
   "redis": {
-    "host": "localhost",
+    "host": "redis",
     "port": 6379
   },
   "album_cover_files": [

services/database/albums.js

@@ -320,11 +320,9 @@ exports.randomCovers = function (count, size, callback) {
     .toArray((err, result) => {
       let res = [];
       if (result.length > count) {
-        let i = 0;
-        while (i < count) {
+        while (count-- > 0) {
           let rnd = randomNumber(0, result.length);
           res.push(result[rnd]);
-          i++;
         }
         callback(res);
       } else {