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'use strict';const mongoose = require('../../lib');const Schema = mongoose.Schema;
console.log('Running mongoose version %s', mongoose.version);
/** * Console schema */
const consoleSchema = Schema({  name: String,  manufacturer: String,  released: Date});const Console = mongoose.model('Console', consoleSchema);
/** * Game schema */
const gameSchema = Schema({  name: String,  developer: String,  released: Date,  consoles: [{    type: Schema.Types.ObjectId,    ref: 'Console'  }]});const Game = mongoose.model('Game', gameSchema);
/** * Connect to the console database on localhost with * the default port (27017) */
mongoose.connect('mongodb://localhost/console', function(err) {  // if we failed to connect, abort  if (err) throw err;
  // we connected ok  createData();});
/** * Data generation */
function createData() {  Console.create(    {      name: 'Nintendo 64',      manufacturer: 'Nintendo',      released: 'September 29, 1996'    },    {      name: 'Super Nintendo',      manufacturer: 'Nintendo',      released: 'August 23, 1991'    },    {      name: 'XBOX 360',      manufacturer: 'Microsoft',      released: 'November 22, 2005'    },    function(err, nintendo64, superNintendo, xbox360) {      if (err) return done(err);
      Game.create(        {          name: 'Legend of Zelda: Ocarina of Time',          developer: 'Nintendo',          released: new Date('November 21, 1998'),          consoles: [nintendo64]        },        {          name: 'Mario Kart',          developer: 'Nintendo',          released: 'September 1, 1992',          consoles: [superNintendo]        },        {          name: 'Perfect Dark Zero',          developer: 'Rare',          released: 'November 17, 2005',          consoles: [xbox360]        },        function(err) {          if (err) return done(err);          example();        }      );    }  );}
/** * Population */
function example() {  Game    .find({})    .populate({      path: 'consoles',      match: { manufacturer: 'Nintendo' },      select: 'name',      options: { comment: 'population' }    })    .exec(function(err, games) {      if (err) return done(err);
      games.forEach(function(game) {        console.log(          '"%s" was released for the %s on %s',          game.name,          game.consoles.length ? game.consoles[0].name : '??',          game.released.toLocaleDateString()        );      });
      return done();    });}
/** * Clean up */
function done(err) {  if (err) console.error(err);  Console.remove(function() {    Game.remove(function() {      mongoose.disconnect();    });  });}