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R8244/node_modules/mongoose/examples/population/population-of-existing-doc.js
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population-of-existing-doc.js
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			var mongoose = require('../../lib');
			var Schema = mongoose.Schema;

			console.log('Running mongoose version %s', mongoose.version);

			/**
			* Console schema
			*/

			var consoleSchema = Schema({
			name: String,
			manufacturer: String,
			released: Date
			});
			var Console = mongoose.model('Console', consoleSchema);

			/**
			* Game schema
			*/

			var gameSchema = Schema({
			name: String,
			developer: String,
			released: Date,
			consoles: [{
			type: Schema.Types.ObjectId,
			ref: 'Console'
			}]
			});
			var 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'
			},
			function(err, nintendo64) {
			if (err) return done(err);

			Game.create({
			name: 'Legend of Zelda: Ocarina of Time',
			developer: 'Nintendo',
			released: new Date('November 21, 1998'),
			consoles: [nintendo64]
			},
			function(err) {
			if (err) return done(err);
			example();
			});
			}
			);
			}

			/**
			* Population
			*/

			function example() {
			Game
			.findOne({name: /^Legend of Zelda/})
			.exec(function(err, ocinara) {
			if (err) return done(err);

			console.log('"%s" console _id: %s', ocinara.name, ocinara.consoles[0]);

			// population of existing document
			ocinara.populate('consoles', function(err) {
			if (err) return done(err);

			console.log(
			'"%s" was released for the %s on %s',
			ocinara.name,
			ocinara.consoles[0].name,
			ocinara.released.toLocaleDateString()
			);

			done();
			});
			});
			}

			function done(err) {
			if (err) console.error(err);
			Console.remove(function() {
			Game.remove(function() {
			mongoose.disconnect();
			});
			});
			}