Express Mongo REST API in ES6 with co and generators mongoose and lodash

box.js

'use strict';

let router = require('express').Router();
const co = require('co');
const mongoose = require('mongoose');
const Box = mongoose.model('Box');
const _ = require('lodash');
// ---

router.route('/')

// ##create
.post(function(req, res) {
  co(function * () {
    let box = new Box(req.body); // create a new instance of the Box model
    try {
      res.json(yield box.save());
    } catch(e) {
      res.json({errors: e});
    }
  });
})

// ## get all
.get(function(req, res) {
  co(function * () {
    try {
      res.json(yield Box.find());
    } catch(e) {
      res.json({errors: e});
    }
  });
});

// ---
router.route('/:_id')

// ## get the box with this id
.get(function(req, res) {
  co(function * () {
    try {
      res.json(yield Box.findById(req.params._id));
    } catch(e) {
      res.json({errors: e});
    }
  });
})

// ## update/patch the box with this id
.put(function(req, res) {
  co(function * () {
    try {
      let box  = yield Box.findById(req.params._id);
      _.assignIn(box, req.body);
      res.json(yield box.save());
    } catch(e) {
      res.json({errors: e});
    }
  });
})

// ## delete the box with this id
.delete(function(req, res) {
  co(function * () {
    try {
      res.json(yield Box.remove({_id: req.params._id }));
    } catch(e) {
      res.json({errors: e});
    }
  });
});

module.exports = router;