Full-Stack React Projects - Second Edition

The Comment API

To implement the add comment API, we will set up a PUT route as follows to update the post.

mern-social/server/routes/post.routes.js:

router.route('/api/posts/comment')    .put(authCtrl.requireSignin, postCtrl.comment)

The comment controller method, which is defined in the following code, will find the relevant post to be updated by its ID and push the comment object that's received in the request body to the comments array of the post.

mern-social/server/controllers/post.controller.js:

const comment = async (req, res) => {  let comment = req.body.comment  comment.postedBy = req.body.userId  try {    let result = await Post.findByIdAndUpdate(req.body.postId,                                    {$push: {comments: comment}},                                    {new: true}) .populate('comments.postedBy', ...