node.js - How do I increment a Number value in Mongoose?

Question

People of StackOverflow, I am burning with the question, how do I increment a
Number value in Mongoose? I have tried the code below, though it is not working. I am trying to increment a value by one on the submission of a form. Below is my code:

app.post('/like', function (req, res) {
    var id = req.body.id;
    var query = {_id: id};
    var post = Meme.findOne(query);
    Meme.findOneAndUpdate(post, post.likes: post.likes+1)
});

Thanks so much for your valuable help!

Answer 1

You can use $inc for this purpose.

Try this:

var id = req.body.id;
Meme.findOneAndUpdate({_id :id}, {$inc : {'post.likes' : 1}}).exec(...);

For more info on $inc, Please read MongoDB $inc documentation