Basic mongo queries using Node.js / Express

mongo-queries.js

// Connect
function connect() {
var mongoose = require('mongoose');

mongoose
  .connect('mongodb://user:pass@ds123456.mlab.com:1234/project', {
    useNewUrlParser: true
  })
  .then(() => {
    console.log('MongoDB Connected');
  })
  .catch(err => {
    console.log(err);
    console.log('\x1b[31m\x1b[1m MongoDB Not Connected');
  });
}

// Add document
function add_document() {
  
  var Schema = mongoose.Schema,
    ObjectId = Schema.ObjectId;
  
  var ScaleSchema = mongoose.Schema({
    name: String,
    price: Number,
    quantity: Number
  });

  // compile schema to model
  var Scale = mongoose.model('Scale', ScaleSchema, 'music_scales');

  // a document instance
  var scale1 = new Scale({ name: 'Introduction to Mongoose', price: 10, quantity: 25 });

  // save model to database
  scale1.save(function (err, scale) {
    if (err) return console.error(err);
    console.log(scale.name + " saved to music_scale collection.");
  });
}