如何增加猫鼬中的数字值? [英] How do I increment a Number value in Mongoose?

问题描述

StackOverflow的人们，我在想这个问题，我该如何增加
猫鼬的数值?我尝试了下面的代码，尽管无法正常工作.我正在尝试在提交表单时将值增加1.下面是我的代码:

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)
});

非常感谢您的宝贵帮助！

Thanks so much for your valuable help!

推荐答案

您可以将$inc用于此目的.

You can use $inc for this purpose.

尝试一下:

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

有关$ inc的更多信息，请阅读 MongoDB $ inc文档

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

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