Lecture 329:- Deleting a Comment (Authorized)

To delete a comment, we first need to create a route for handling the deletion of comments. In the routes folder, create a new file called commentRoutes.js and add the following code:

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const express = require('express'); const router = express.Router({ mergeParams: true }); const { ensureAuthenticated } = require('../config/auth'); const Post = require('../models/Post'); const Comment = require('../models/Comment'); // Delete a comment router.delete('/:commentId', ensureAuthenticated, async (req, res) => {  try {    const { commentId } = req.params;    const { postId } = req.params;    // Find the comment by id and remove it    const deletedComment = await Comment.findByIdAndRemove(commentId);    // Find the post that the comment belongs to and remove the comment id from its comments array    const post = await Post.findByIdAndUpdate(postId, {      $pull: { comments: commentId },    });    res.status(200).json({ message: 'Comment deleted successfully' });  } catch (error) {    console.error(error);    res.status(500).json({ message: 'Server Error' });  } }); module.exports = router;

In this file, we first import the necessary modules and models. Then, we define a DELETE route for deleting a comment. We use the ensureAuthenticated middleware to ensure that the user is logged in before allowing them to delete a comment.

In the route handler, we extract the commentId and postId from the request parameters. We use findByIdAndRemove to find and remove the comment by its id. We then use findByIdAndUpdate to find the post that the comment belongs to and remove the comment id from its comments array using $pull. Finally, we send a JSON response indicating that the comment was deleted successfully.

Now we need to add this route to our app. In the app.js file, add the following code:

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const commentRoutes = require('./routes/commentRoutes'); app.use('/posts/:postId/comments', commentRoutes);

This tells our app to use the commentRoutes for URLs that match the pattern /posts/:postId/comments/*, where * can be any string.

With this in place, we can now delete comments by sending a DELETE request to /posts/:postId/comments/:commentId, where :postId is the id of the post that the comment belongs to and :commentId is the id of the comment to be deleted.