createDB.js

var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/parfum";

MongoClient.connect(url, { useNewUrlParser: true }, function (err, db) {
  if (err) throw err;
  console.log("Database created!");
  db.close();
  MongoClient.connect("mongodb://localhost:27017/", { useNewUrlParser: true }, function (err, db) {
    if (err) throw err;
    var dbo = db.db("parfum");
    dbo.createCollection("teams", function (err, res) {
      if (err) throw err;
      console.log("Collection teams created!");
      dbo.createCollection("teamAttempts", function (err, res) {
        if (err) throw err;
        console.log("Collection teamAttempts created!");
        db.close();


        //testTeam
        MongoClient.connect("mongodb://localhost:27017/", { useNewUrlParser: true }, function (err, db) {
          if (err) throw err;
          var dbo = db.db("parfum");

          var team = { name: "Hony" };
          dbo.collection("teams").insertOne(team, function (err, res) {
            if (err) throw err;
            console.log("added team");
            db.close();
          });

          var teamAttempt0 = {
            teamName: "Hony",
            try: 0,
            originalIngredients: ['Bergamont', 'Fialka', 'Ibišek', 'Ibišek'],
            inputIngredients: ['Kosatec', 'Vanilka', 'Rozmarýn', 'Ibišek'],
            result: { '0': 'miss', '1': 'miss', '2': 'miss', '3': 'critical-hit' }
          };

          var teamAttempt1 = {
            teamName: "Hony",
            try: 0,
            originalIngredients: ['Bergamont', 'Fialka', 'Ibišek', 'Ibišek'],
            inputIngredients: ['Bergamont', 'Fialka', 'Rozmarýn', 'Ibišek'],
            result: { '0': 'miss', '1': 'miss', '2': 'miss', '3': 'critical-hit' }
          };

          dbo.collection("teamAttempts").insertOne(teamAttempt0, function (err, res) {
            if (err) throw err;
            console.log("added teamAttempt0");
            db.close();
          });

          dbo.collection("teamAttempts").insertOne(teamAttempt1, function (err, res) {
            if (err) throw err;
            console.log("added teamAttempt1");
            db.close();
          });
        });
        //end testTeam
      });
    });
  });
});


setTimeout(function () {
  //print data form 
  MongoClient.connect(url, { useNewUrlParser: true }, function (err, db) {
    if (err) throw err;
    var dbo = db.db("parfum");
    dbo.collection('teams').aggregate([
      {
        $lookup:
        {
          from: 'teamAttempts',
          localField: 'name',
          foreignField: 'teamName',
          as: 'attempts'
        }
      }
    ]).toArray(function (err, res) {
      if (err) throw err;
      console.log(JSON.stringify(res));
      db.close();
    });
  });
}, 2000);