mongoose save (example from their website not working) - node.js

Question

I have my file to add data to mongo via mongoose :
var mongoose = require('mongoose');
var mongoDB = 'mongodb://myuser:mypass#ds145293.mlab.com:45293/employees';
mongoose.connect(mongoDB);
mongoose.Promise = global.Promise;
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error:'))
db.once('open',function(){
console.log('connected')
var kittySchema = mongoose.Schema({
name: String
});
var Kitten = mongoose.model('Kitten', kittySchema);
var fluffy = new Kitten({ name: 'fluffy' });
fluffy.save(function (err, fluffy) {
if (err) return console.error(err);
console.log('saved');
});
})
mongoose.connection.close()
Copied almost verbatim from mongoose site.I am able to connect to the database but i dont get the 2nd console log.I have a db but no collections.Is this the problem?

Answer 1

Replace mongoose.Schema with new Schema and also I don't think this mongoose.Promise = global.Promise is required.

Answer 2

It cant complete the save before you close the database. There are many options to wait for the save. I like async/await.
edit: sorry that was too quick. Updated example.
var mongoose = require('mongoose');
var mongoDB = 'mongodb://localhost/something';
async function run() {
await mongoose.connect(mongoDB);
console.log('connected')
var kittySchema = new mongoose.Schema({ name: String });
var Kitten = mongoose.model('Kitten', kittySchema);
var fluffy = new Kitten({ name: 'fluffy' });
await fluffy.save();
console.log('saved');
mongoose.connection.close();
}
run();
Or you can just move the close to after you have saved:
var mongoose = require('mongoose');
var mongoDB = 'mongodb://localhost/something';
mongoose.connect(mongoDB);
mongoose.Promise = global.Promise;
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error:'))
db.once('open', function () {
console.log('connected')
var kittySchema = new mongoose.Schema({name: String });
var Kitten = mongoose.model('Kitten', kittySchema);
var fluffy = new Kitten({ name: 'fluffy' });
fluffy.save(function (err, fluffy) {
if (err) return console.error(err);
console.log('saved');
mongoose.connection.close();
});
})