通过Mongoose JS的MongoDB-什么是findByID? [英] MongoDB via Mongoose JS - What is findByID?

问题描述

我正在用ExpressJS，PassportJS，MongoDB和MongooseJS编写NodeJS服务器.我只是设法让PassportJS使用通过Mongoose获得的用户数据进行身份验证.

I am writing a NodeJS server with ExpressJS, PassportJS, MongoDB and MongooseJS. I just managed to get PassportJS to use user data obtained via Mongoose to authenticate.

但是要使其正常工作，我必须使用如下所示的"findById"函数.

But to make it work, I had to use a "findById" function like below.

var UserModel = db.model('User',UserSchema);

UserModel.findById(id, function (err, user) { < SOME CODE > } );

UserModel是猫鼬模型.我早些时候声明了架构UserSchema.所以我想UserModel.findById()是猫鼬模型的一种方法?

UserModel is a Mongoose model. I declare the schema, UserSchema earlier. So I suppose UserModel.findById() is a method of the Mongoose model?

问题

findById的作用是什么，并且上面有文档吗?我在Google上搜索了一下，但没有找到任何东西.

What does findById do and is there documentation on it? I googled around a bit but didn't find anything.

推荐答案

findById是Mongoose提供的用于通过其_id查找文档的模型的便捷方法.可以在此处找到它的文档.

findById is a convenience method on the model that's provided by Mongoose to find a document by its _id. The documentation for it can be found here.

示例:

// Search by ObjectId
var id = "56e6dd2eb4494ed008d595bd";
UserModel.findById(id, function (err, user) { ... } );

功能上与调用相同:

UserModel.findOne({_id: id}, function (err, user) { ... });

请注意，猫鼬会将提供的id值转换为架构中定义的_id类型(默认为ObjectId).

Note that Mongoose will cast the provided id value to the type of _id as defined in the schema (defaulting to ObjectId).

这篇关于通过Mongoose JS的MongoDB-什么是findByID?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！