check online from users:online zset

src/database/mongo/sorted.js

@@ -321,7 +321,7 @@ module.exports = function(db, module) {
 			return callback();
 		}
 		value = helpers.valueToString(value);
-		db.collection('objects').findOne({_key:key, value: value}, {fields:{_id: 0, score: 1}}, function(err, result) {
+		db.collection('objects').findOne({_key: key, value: value}, {fields:{_id: 0, score: 1}}, function(err, result) {
 			callback(err, result ? result.score : null);
 		});
 	};

src/user.js

@@ -135,7 +135,7 @@ var	async = require('async'),
 	};
 
 	User.isOnline = function(uid, callback) {
-		User.getUserField(uid, 'lastonline', function(err, lastonline) {
+		db.sortedSetScore('users:online', uid, function(err, lastonline) {
 			if (err) {
 				return callback(err);
 			}