How can I remove an Object from a MongoDB array without $pull? - arrays

Question

I'm trying to make a social media app, so I wrote a route that allows users to like posts, but If someone already liked it and pressed "like" again - It should remove the like, right? The point is - I can't use $pull since it uses findByIdAndUpdate, which can only be used if likes have their own separated model, but I don't have it because I think that overworks db a bit.
I use for to cycle trough an array and scan an Id of an Object and validate if it matches an Id of the logged user
const post = await Post.findById(request.params.post_id)
for (let i = 0; i < post.likes.length; i++) {
if (post.likes[i].userId === request.user.id) {
// Remove post.likes.[i] from the database completely
}
}
Here is how post looks like in Mongo documents:
{ "userId": "627eae4ed5b20f818d7a8142", "title": "Simple Post Title", "body": "Whatever",
"likes": [{ "userId": "627eae4ed5b20f818d7a8142", "likedAt": "14:58:20" }], }
If there is something else I need to provide - don't hesitate to ask.

Answer 1

Nevermind guys! I did it, I only needed to update the Post collection, nothing more!
for (let i = 0; i < post.likes.length; i++) {
if (post.likes[i].userId === request.user.id) {
Post
.findByIdAndUpdate(post._id, {
$pull: { likes: post.likes[i] }
}, {
new: true,
runValidators: true
})
.then((updated_post) => {
response.status(200).json({ success: true, updated_post: updated_post })
})
.catch(() => {
return next(
new ErrorResponse(`An error occurred while updating the post`, 400)
)
})
}
}
It does gives me an error, but I think I'll manage
Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client