mongoose-test.js

const mongoose = require('mongoose');
let Schema     = mongoose.Schema({ name : String });
let Model      = mongoose.model('MyModel', Schema);

mongoose.Promise = Promise;
mongoose.connect('mongodb://localhost/foobar');

Model.create({ name : 'Jack' }).then(d => {
  console.log('Created new document, _id =', d._id);
  // Convert to string and query.
  return Model.find({ _id : d._id.toString() });
}).then(d => {
  if (d) {
    console.log('Found document', d);
  } else {
    console.log('Unable to find document :(');
  }
  mongoose.disconnect();
}).catch(e => console.log('Error', e));