如何使变量成为猫鼬的唯一键?

问题描述：

例如，如果我有此架构

var userSchema = mongoose.Schema({
    username: String,
    email: String,
    password: String,
    _todo: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Todo'}]
});

我希望用户名是唯一密钥，其他用户不能重复.我该怎么办?

I would like the username to be a unique key that cannot be duplicated by other users. How can I do this?

答

您可以使用unique属性添加约束.这还将为该字段添加一个唯一"索引到您的集合:

You can add a constraint with the unique attribute. This will also add a "unique" index for the field to your collection:

var userSchema = mongoose.Schema({
    username: { type: String, unique: true },
    email: String,
    password: String,
    _todo: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Todo'}]
});

如何使变量成为猫鼬的唯一键?

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