Connect Mongoose to MongoDB on startup

server.js

@@ -12,6 +12,17 @@ var init = require('./config/init')(),
 // Avoids DEPTH_ZERO_SELF_SIGNED_CERT error for self-signed certs
 process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
 
+mongoose.connect(config.mongoUri, {
+    useNewUrlParser: true,
+    useUnifiedTopology: true
+});
+mongoose.connection.on('error', function (err) {
+    console.error('MongoDB connection error:', err.message);
+});
+mongoose.connection.once('open', function () {
+    console.log('MongoDB connected');
+});
+
 /**
  * Main application entry file.
  * Please note that the order of loading is important.