/Javascript/Express/How to Delete Comment from Post on Node, express and Mongoose and Ajax

How to Delete Comment from Post on Node, express and Mongoose and Ajax

// How to Delete Comment from Post on Node, express and Mongoose and Ajax

You need to know both the postId and the commentId to be able to delete the comment from posts collection. Also it would be good to delete the comment inside the comments collection.

So change your delete route to include postId and commentId as req.params. You can delete a comment from posts using the findByIdAndUpdate method and $pull operator.

router.delete("/comments/:postId/:commentId", async function (req, res) {
  try {
    const post = await Post.findByIdAndUpdate(
      req.params.postId,
      {
        $pull: { comments: req.params.commentId },
      },
      { new: true }
    );

    if (!post) {
      return res.status(400).send("Post not found");
    }

    await Comment.findByIdAndDelete(req.params.commentId);

    res.send("Success");
  } catch (err) {
    console.log(err);
    res.status(500).send("Something went wrong");
  }
});
TEST

Let's say we have this post document with 3 comments.

Posts:

{
    "_id" : ObjectId("5e8b10c49ae619486094ed10"),
    "comments" : [
        ObjectId("5e8b104f9ae619486094ed0d"),
        ObjectId("5e8b10599ae619486094ed0e"),
        ObjectId("5e8b105e9ae619486094ed0f")
    ],
    "title" : "Title",
    "description" : "Description...",
    "from" : "From",
    "postImage" : "Post Image",
    "createdAt" : ISODate("2020-04-06T14:21:40.884+03:00")
}
Comments:

{
    "_id" : ObjectId("5e8b105e9ae619486094ed0f"),
    "message" : "Comment 3"
},

{
    "_id" : ObjectId("5e8b10599ae619486094ed0e"),
    "message" : "Comment 2"
},
{
    "_id" : ObjectId("5e8b104f9ae619486094ed0d"),
    "message" : "Comment 1"
}
If we want to delete the comment with _id:5e8b10599ae619486094ed0e, we need to send a DELETE request to our route using url like this:

http://localhost:3000/posts/comments/5e8b10c49ae619486094ed10/5e8b10599ae619486094ed0e
5e8b10c49ae619486094ed10 is the postId, 5e8b10599ae619486094ed0e is the commentId.

Result will be like this:

Posts:

{
    "_id" : ObjectId("5e8b10c49ae619486094ed10"),
    "comments" : [
        ObjectId("5e8b104f9ae619486094ed0d"),
        ObjectId("5e8b105e9ae619486094ed0f")
    ],
    "title" : "Title",
    "description" : "Description...",
    "from" : "From",
    "postImage" : "Post Image",
    "createdAt" : ISODate("2020-04-06T14:21:40.884+03:00")
}
Comments:

{
    "_id" : ObjectId("5e8b105e9ae619486094ed0f"),
    "message" : "Comment 3"
},
{
    "_id" : ObjectId("5e8b104f9ae619486094ed0d"),
    "message" : "Comment 1"
}
Share
Follow
answered Apr 6 '20 at 11:37

SuleymanSah
12.8k55 gold badges1717 silver badges4242 bronze badges
1
@SuleymanSahThank you so much for taking your time to explain to me how it works, i really appreciate it. I did exactly what you said with the code you gave me above, and changed my link to include post id like this ` <a class="delete-comment" href="#" data-id="<%=post.id%>/<%=item._id%>">Delete</a> ` and everything is – Chukwuma Kingsley Apr 6 '20 at 11:58

Similar codes

1 vote201 views1 answer
Nodejs check if express started
Javascript Express
0 vote189 views1 answer
Put route error express
Javascript Express
6 votes183 views3 answers
Express urlencoded
Javascript Express
0 vote203 views1 answer
What regular express will match valid internation number
Javascript Express
0 vote184 views1 answer
Jsdoc for express routes
Javascript Express
2 votes218 views1 answer
What will you write to add the .env file to your express application?
Javascript Express
1 vote262 views1 answer
Run project in visual studio with iis express
Javascript Express
1 vote181 views1 answer
How to filter array objesct in express node js
Javascript Express
57 votes368 views3 answers
Require express
Javascript Express
1 vote201 views1 answer
Javascript express app listen
Javascript Express