possible fix for #1909

src/database/mongo/list.js

@@ -4,17 +4,16 @@ module.exports = function(db, module) {
 	var helpers = module.helpers.mongo;
 
 	module.listPrepend = function(key, value, callback) {
+		callback = callback || function() {};
 		value = helpers.valueToString(value);
 
 		module.isObjectField(key, 'array', function(err, exists) {
-			if(err) {
-				if(typeof callback === 'function') {
-					return callback(err);
-				}
+			if (err) {
+				return callback(err);
 			}
 
-			if(exists) {
-				db.collection('objects').update({_key:key}, {'$set': {'array.-1': value}}, {upsert:true, w:1 }, helpers.done(callback));
+			if (exists) {
+				db.collection('objects').update({_key:key}, {$push: {array: {$each: [value], $position: 0}}}, {upsert:true, w:1 }, callback);
 			} else {
 				module.listAppend(key, value, callback);
 			}

src/messaging.js

@@ -87,7 +87,7 @@ var db = require('./database'),
 	Messaging.getMessages = function(fromuid, touid, isNew, callback) {
 		var uids = sortUids(fromuid, touid);
 
-		db.getSortedSetRange('messages:uid:' + uids[0] + ':to:' + uids[1], -((meta.config.chatMessagesToDisplay || 50) - 1), -1, function(err, mids) {
+		db.getSortedSetRevRange('messages:uid:' + uids[0] + ':to:' + uids[1], 0, (meta.config.chatMessagesToDisplay || 50) - 1, function(err, mids) {
 			if (err) {
 				return callback(err);
 			}
@@ -96,6 +96,8 @@ var db = require('./database'),
 				return callback(null, []);
 			}
 
+			mids.reverse();
+
 			getMessages(mids, fromuid, touid, isNew, callback);
 		});