TypeError: Cannot read property 'length' of undefined

[IteshAmbre]

[Aadesh-singh]

im getting the same error, did you find the answer

[iam-amanxz]

you can do something like => if (post?.likes?.length > 0) to get rid of that error

[Troy-Peng-97]

you can do something like => if (post?.likes?.length > 0) to get rid of that error

fix my issue!

[ThayGiaoTien]

thank a lot! <3

[MrBeech]

I just ran into this error too and your suggested solution has the disadvantage that the likes got reset. If you want to keep your likes after editing change the /server/controllers/posts.js file like this:

export const updatePost = async (req, res) => {

const { id } = req.params;
const { title, message, creator, selectedFile, tags, likes } = req.body;

if (!mongoose.Types.ObjectId.isValid(id)) return res.status(404).send(`No post with id: ${id}`);

const updatedPost = { creator, title, message, tags, selectedFile, likes, _id: id };

await PostMessage.findByIdAndUpdate(id, updatedPost, { new: true });

res.json(updatedPost);

}