fixed #3218

src/database/mongo.js

@@ -8,6 +8,7 @@
 		nconf = require('nconf'),
 		session = require('express-session'),
 		_ = require('underscore'),
+		semver = require('semver'),
 		db, mongoClient;
 
 	_.mixin(require('underscore.deep'));
@@ -137,6 +138,7 @@
 			}
 
 			function createIndices() {
+				winston.info('[database] Checking database indices.')
 				async.parallel([
 					async.apply(createIndex, 'objects', {_key: 1, score: -1}, {background: true}),
 					async.apply(createIndex, 'objects', {_key: 1, value: -1}, {background: true, unique: true, sparse: true}),
@@ -164,6 +166,17 @@
 		});
 	};
 
+	module.checkCompatibility = function(callback) {
+		// For MongoDB, we need to ensure that the mongodb package is >= 2.0.0
+		var mongoPkg = require.main.require('./node_modules/mongodb/package.json'),
+			err = semver.lt(mongoPkg.version, '2.0.0') ? new Error('The `mongodb` package is out-of-date, please run `./nodebb setup` again.') : null;
+
+		if (err) {
+			err.stacktrace = false;
+		}
+		callback(err);
+	};
+
 	module.info = function(db, callback) {
 		db.stats({scale:1024}, function(err, stats) {
 			if(err) {