read(req, res) {
const article = PostModel.findOne({ _id:
req.params.id })
.then(post => post)
.catch(err => res.json(err));
const comments = CommentModel.find({ post:
req.params.id })
.then(comments => comments)
.catch(err => res.json(err));
const resp = [];
resp.push(article);
resp.push(comments);
res.json(article);
}