updateProducts(productForm, id) {
        const temp = {
            'description': productForm.description,
            'quality': productForm.quality
        };
        return this.httpObj.put(`${this.uri}/products/${id}`, JSON.stringify(temp), {
            headers: new HttpHeaders({
                'Content-Type': 'application/json'
            })
    });
    }

router.put('/:id', function(req, res, next) {
  Products.findByIdAndUpdate(req.params.id, req.body, function (err, post) {
    if (err) return next(err);
    res.json(post);
  });
});