Full-Stack React Projects - Second Edition

The Unlike API

The unlike API will be implemented similar to the like API, with its own route. This will be declared as follows.

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

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

The unlike method in the controller will find the post by its ID and update the likes array by removing the current user's ID using $pull instead of $push. The unlike controller method will look as follows.

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

const unlike = async (req, res) => {  try {    let result = await Post.findByIdAndUpdate(req.body.postId,                                 {$pull: {likes: req.body.userId}},                                 {new: true})    res.json(result)  } catch(err) {    return res.status(400).json({ error: errorHandler.getErrorMessage(err) ...