server.js

// set up ======================================================================
var express = require('express');
var app = express(); 
var mongoose = require('mongoose'); 				
var port = 3000;
var bodyParser = require('body-parser');
var methodOverride = require('method-override');

// Connection URL. This is where your mongodb server is running.
var url = 'mongodb://localhost:27017/db';

// configuration ===============================================================


// Use connect method to connect to the Server
mongoose.connect(url);

app.use(express.static('./public')); 
//app.use(bodyParser.json()); // parse application/json
//app.use(bodyParser.json({type: 'application/vnd.api+json'})); // parse application/vnd.api+json as json
app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({limit: '50mb', 'extended': 'true'}));
app.use(methodOverride('X-HTTP-Method-Override')); // override with the X-HTTP-Method-Override header in the request


// routes ======================================================================
var Participant = mongoose.model('Participant', {
	name: Number,
	appearance: {
		age: String,
		gender: String,
		glasses: String,
		ethnicity: String
	},
	images: [ 
	{
		imageName: String,
		trueValence: Number,
		trueArousal: Number,
		samValence: Number,
		samArousal: Number,
		inputs: [
		{
			timestamp: Number,
			emotions: {
				joy: Number,
				anger: Number,
				contempt: Number,
				disgust: Number,
				engagement: Number,
				fear: Number,
				sadness: Number,
				surprise: Number,
				valence: Number,
			}
		}
		]
	}
	]
});
var Images = mongoose.model('Images', {
	participantId: Number,
	imageName: String,
	trueValence: Number,
	trueArousal: Number,
	samValence: Number,
	samArousal: Number,
	inputs: [
	{
		timestamp: Number,
		emotions: {
			joy: Number,
			anger: Number,
			contempt: Number,
			disgust: Number,
			engagement: Number,
			fear: Number,
			sadness: Number,
			surprise: Number,
			valence: Number,
		}
	}
	]
});

function getAll(res) {
    Participant.find(function (err, all) {

        // if there is an error retrieving, send the error. nothing after res.send(err) will execute
        if (err) {
            res.send(err);
        }

        res.json(all); // return all todos in JSON format
    });
};

app.post('/api/newUser', function (req, res) {

	var previosParticipantId = 0;
	Participant.findOne().sort('-name').select('name').exec(function (err, participant) {
		if (err)
			res.send(err);
		console.log("participant: " + participant);
		if (!participant) {
		} else {
			previosParticipantId = participant.name;
			console.log("id: " + previosParticipantId);
		}

		console.log("prev id: " + previosParticipantId);
		var newId = previosParticipantId+1;
		console.log("new id: " + newId);
		Participant.create({
	            name: newId,
	            appearance: req.body.appearance,
	            images: []
	        }, function (innerErr, participant) {
	            if (innerErr)
	                res.send(innerErr);

	            res.json(participant);
	        });
	    });
	});
	

// POST method route
app.post('/api/saveNewImage', function (req, res) {
	Images.create({ 
		participantId: req.body.participantId,
		imageName: req.body.imageName,
    	trueValence: req.body.trueValence,
    	trueArousal: req.body.trueArousal,
    	samValence: req.body.samValence,
    	samArousal: req.body.samArousal,
		inputs: req.body.inputs
	}, function(err, doc) {
		if (err)
			res.send(err);

	    res.sendStatus(200);
	    //getAll(res);
	});
})

app.get('*', function (req, res) {
	res.sendFile(__dirname + '/public/index.html');
});

// listen (start app with node server.js) ======================================
app.listen(port);
console.log("App listening on port " + port);