functionTest.js

var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var ObjectId = require('mongodb').ObjectID;
var url = require('./credentials').mongoDBUrl

var insertDocument = function(db) {
  db.collection('users').insertOne(
    {
      NRIC: 'S9526187D',
      Name: 'Russell',
      Usage: [
        { page_id: 0, time_spent: 5 },
        { page_id: 1, time_spent: 7 }
      ],
      Feature: {
        age: 35,
        gender: 'male',
        income: 100000,
        race: 'chinese',
        job_industry: 'software',
        education_level: 'degree'
      },
      Recommendation: [0, 1, 2]
    },
    function(err, result) {
      assert.equal(err, null);
      console.log('Inserted a document into the users collection.');
    }
  );
};

var findFamilies = function(db) {
  db.collection('users')
    .find({ NRIC: 'S9526187D' })
    .toArray(function(err, result) {
      console.log(result[0].Usage);
    });
};

var updateFamilies = function(db) {
  db.collection('users').update(
    { NRIC: 'S9526187D', 'Usage.page_id': 1 },
    {
      $set: { 'Usage.$.time_spent': 25 }
    },
    function(err, results) {
      console.log(results);
    }
  );
};

var removeFamilies = function(db) {
  db.collection('users').deleteMany({ NRIC: 'S9474355I' });
};

MongoClient.connect(url, function(err, client) {
  assert.equal(null, err);
  var db = client.db('neumorphic');

  insertDocument(db);
  // findFamilies(db);
  //removeFamilies(db);
  // updateFamilies(db)
  client.close();
});