How to add new object to MongoDB array?

Question

MongoDB

There is such a scheme:

var PostSchema = new Schema({
  title: String,
  description: String,
  content: String,
  image: String,
  category: String,
  url: String,
  views: {
    type: Number,
    default: 0
  },
  comments: [
    {
      username: String,
      email: String,
      comment: String
    }
  ]
});

I can't figure out how to correctly add another comment to the comments array.
Tried like this, but it doesn't seem to be even close to what I need.

router.put('/blog/:url/add-comment', (req, res) => {
    let db = req.db
    Post.updateOne({ 'url': req.params.url }, {$push: {comments: {
      'username': req.body.comments.username,
      'email': req.body.comments.email,
      'comment': req.body.comments.comment
    }}})

By the way, if for example I have a separate method for updating the counter of views and there is a form for adding comments, both use the Put method, then each needs a separate route (/post/:url/update-conter, /post/:url/new-comment ) , or is it possible to pass different methods on one route?