PM2        | App [Lerative] with id [0] and pid [27744], exited with code [1] via signal [SIGINT]
PM2        | Starting execution sequence in -fork mode- for app name:Lerative id:0
PM2        | App name:Lerative id:0 online
0|Lerative | ObjectParameterError: Parameter "obj" to Document() must be an object, got function (req, res, next) {
0|Lerative |     app.handle(req, res, next);
0|Lerative |   }
0|Lerative |     at new ObjectParameterError (/home/ec2-user/lerative-backend/node_modules/mongoose/lib/error/objectParameter.js:23:11)
0|Lerative |     at model.Document (/home/ec2-user/lerative-backend/node_modules/mongoose/lib/document.js:54:11)
0|Lerative |     at model.Model (/home/ec2-user/lerative-backend/node_modules/mongoose/lib/model.js:55:12)
0|Lerative |     at new model (/home/ec2-user/lerative-backend/node_modules/mongoose/lib/model.js:3901:13)
0|Lerative |     at model (/home/ec2-user/lerative-backend/node_modules/mongoose/lib/model.js:3899:16)
0|Lerative |     at module.exports (/home/ec2-user/lerative-backend/api/models/index.js:5:5)
0|Lerative |     at NativeConnection.<anonymous> (/home/ec2-user/lerative-backend/server.js:30:28)
0|Lerative |     at Object.onceWrapper (events.js:254:19)
0|Lerative |     at NativeConnection.emit (events.js:159:13)
0|Lerative |     at /home/ec2-user/lerative-backend/node_modules/mongoose/lib/connection.js:860:13
0|Lerative |     at connectCallback (/home/ec2-user/lerative-backend/node_modules/mongoose/node_modules/mongodb/lib/mongo_client.js:515:5)
0|Lerative |     at /home/ec2-user/lerative-backend/node_modules/mongoose/node_modules/mongodb/lib/mongo_client.js:430:11
0|Lerative |     at _combinedTickCallback (internal/process/next_tick.js:131:7)
0|Lerative |     at process._tickDomainCallback (internal/process/next_tick.js:218:9)

mongoose.Promise = global.Promise;
mongoose.connect(mongoURL, { useMongoClient : true});
// configure app to use bodyParser()
// this will let us get the data from a POST
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

var port = process.env.PORT || 3000; // set our PORT


// REGISTER ROUTES
// all of our routes will be prefixed with /api

// START THE server
// ============================================================
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
    require('./api/models')(app, db);
    require('./api/routes')(app, db);
    app.listen(port, () => {
        console.log('We are live on ' + port);
    });
});

var mongoose = require('mongoose');

var Schema = mongoose.Schema;

var userSchema = Schema({
    firstName: { type:String, required: [true, 'First name is empty.']},
    lastName : { type:String, required: [true, 'Last name is empty.']},
    username : { type:String, required: [true, 'Username is empty.']},
    password : { type:String, required: [true, 'Password is empty.']},
    mail     : { type:String, required: [true, 'Mail is empty.']},
    created_at: { type: Date, default: new Date() },
    updated_at: { type: Date, default: new Date() },
    interests: [],
    readingLists: [],
    library: {},
    contributions: []
});



module.exports = mongoose.model('User', userSchema,'User');

// routes/user_routes.js

const User = require("../models/user_model");
const ObjectID = require('mongodb').ObjectID;

module.exports = function(app, db) {

    // GET USER WITH ID
    app.get('/user/:id', (req, res) => {
        const id = { '_id' : new ObjectID(req.params.id) };
        User.findById(req.params.id, (err, user) => {
            if (err) {
                res.status(500).send(err); // 500 means database error
            }
            if (user) {
                res.status(200).send(user); // 200 means success
            }else {
                res.status(404).send("No user found with this ID.");
            }
        });
    });

    // POST -- CREATE NEW USER
    app.post('/user', (req, res) => {
        let newUser = new User(req.body);
        newUser.save((err, createdUser) => {
            if (err) {
                res.status(500).send(err);
            }else {
                // This createdUser is the same one we saved, but after Mongo
                // added its additional properties like _id.
                res.status(200).send(createdUser);
            }
        });
    });

    // DELETE EXISTING USER
    app.delete('/user/:id', (req, res) => {
        const id = { '_id' : new ObjectID(req.params.id) };
        User.findByIdAndRemove(req.params.id, (err, user) => {
            if (err) {
                res.status(500).send(err);
            }else {
                res.status(200).send({ 'message' : req.params.id + 'successfully deleted.' });
            }
        });
    });

    // PUT - UPDATE EXISTING USER
    app.put('/user/:id', (req, res) => {
        const id = { '_id' : new ObjectID(req.params.id) };
        User.findByIdAndUpdate(id, req.body, (err, user) => {
            if (err) {
                res.status(500).send(err);
            }else {
                res.status(200).send(req.body);
            }
        });
    });
};