node.js 如何在 mongodb 中设置整数的默认值？
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How do I set default value of an integer in mongodb?
提问by cor03rock
I'm new to mongodb and node.js. Let me know, how do I set default value after creating the user.
我是 mongodb 和 node.js 的新手。让我知道，如何在创建用户后设置默认值。
Here is my current code:
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);
});
});
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'.
我希望在创建用户后我的赢、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”。
回答by WiredPrairie
As you're using Mongoose, you can set the default as part of the Schemadefinition:
当您使用 Mongoose 时，您可以将默认值设置为Schema定义的一部分：
var userSchema = new Schema({
win: { type: Number, default: 0 }
});
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.
这些选项记录在此处。如果您将默认值设置为函数，它将在实例化模型时执行，这也很酷。例如，如果它是：default: Date.now，它将Date.now()在创建模型时调用该函数。
