server.js

var express       = require('express');
var app           = express();
var bodyParser    = require('body-parser');

//get data from a POST
app.use(bodyParser.urlencoded({ extended: true}));
app.use(bodyParser.json());

var port = process.env.PORT || 8080;

var router = express.Router();

router.use(function(req, res, next) {
  console.log('Something is happening.');
  next();
});

router.get('/', function(req, res){
  res.json({message: 'hooray! welcome to our api!'});
})

router.route('/bears')
    // create a bear (accessed at POST http://localhost:8080/api/bears)
    .post(function(req, res) {

        var bear = new Bear();      // create a new instance of the Bear model
        bear.name = req.body.name;  // set the bears name (comes from the request)

        // save the bear and check for errors
        bear.save(function(err) {
            if (err)
                res.send(err);

            res.json({ message: 'Bear created!' });
        });

    })

    .get(function(req, res) {
        Bear.find(function(err, bears) {
            if (err)
                res.send(err);

            res.json(bears);
        });
    });

router.route('/bears/:bear_id')

    // get the bear with that id (accessed at GET http://localhost:8080/api/bears/:bear_id)
    .get(function(req, res) {
        Bear.findById(req.params.bear_id, function(err, bear) {
            if (err)
                res.send(err);
            res.json(bear);
        });
    })

    .put(function(req, res) {

        // use our bear model to find the bear we want
        Bear.findById(req.params.bear_id, function(err, bear) {

            if (err)
                res.send(err);

            bear.name = req.body.name;  // update the bears info

            // save the bear
            bear.save(function(err) {
                if (err)
                    res.send(err);

                res.json({ message: 'Bear updated!' });
            });

        });
    })

    .delete(function(req, res) {
        Bear.remove({
            _id: req.params.bear_id
        }, function(err, bear) {
            if (err)
                res.send(err);

            res.json({ message: 'Successfully deleted' });
        });
    });

app.use('/api', router);

app.listen(port);
console.log('Magic happens on port ' + port);

var mongoose = require('mongoose');
mongoose.connect('mongodb://127.0.0.1:27017');

var Bear = require('./app/models/bear');