如何在mongodb中设置整数的默认值? [英] How do I set default value of an integer in mongodb?

问题描述

我是mongodb和node.js的新手.让我知道，创建用户后如何设置默认值.

I'm new to mongodb and node.js. Let me know, how do I set default value after creating the user.

这是我当前的代码:

// CREATE USER
app.post("/user/create", function (req, res) {
    var user = new User({
        username: req.body.username,
        password: req.body.password,
        email: req.body.email,
        //changes made
        win: req.body.win,
        lose: req.body.lose,
        draw: req.body.draw
    });
    user.save(function (err, user) {
        if (err)
            res.json(err)
        //res.end('Registration '+user.username +' Ok!');
        req.session.loggedIn = true;
        res.redirect('/user/' + user.username);
    });
});

我希望在创建用户后将我的赢，输，平局字段设置为0.在我的用户架构中，它们被声明为数字".

I want that my win, lose, draw fields are set to 0 after creating a user. In my user schema they are declared as 'Numbers'.

推荐答案

在使用Mongoose时，您可以将默认值设置为Schema定义的一部分:

As you're using Mongoose, you can set the default as part of the Schema definition:

var userSchema = new Schema({ 
    win: { type: Number, default: 0 }
});

在此处中记录了这些选项.如果将默认值设置为一个函数，它将在实例化Model时执行，这也很酷.例如，如果它是:default: Date.now，则在创建模型时将调用Date.now()函数.

The options are documented here. It's also cool that if you set the default to a function, it will execute when the Model is instantiated. For example, if it were: default: Date.now, it will call the Date.now() function when a model is created.

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