javascript - 如何在 Node.js 中发送响应

Question

I am developing an app where I am using Node.js and MongoDB in the backend. The scenario is: The user fills all the details and post it to the server. The data is stored in MongoDB database with one ObjectID. Now I want to send that ObjectID as response to the user.

The code is given below:

router.route('/user')

.post(function(req, res) {

        var user = new User(); // create a new instance of the User model
        user.name = req.body.name; // set the user name (comes from the request)

        user.email = req.body.email; // set the user email (comes from the
                                                                        // request)
        user.age = req.body.age; // set the user age(comes
        user.save(function(err) {
                if (err) {
                        res.send(err);
                }

                res.json({
                        message: 'User Created!',

                });
        });

The User Schema is given below:

var mongoose     = require('mongoose');
var Schema       = mongoose.Schema;

var UserSchema   = new Schema({
        email:                          String,
        name:                           String,
        age:             String,

});

module.exports = mongoose.model('User', UserSchema);

How will I send that ObjectID as response. Please tell me how it can be achieved

Thanks

Answer 1

除了 MongoDB 之外，您似乎还在使用 ODM，例如 Mongoose。您必须检查 ODM 的文档以了解您想要执行的操作。但通常，一旦您获得了想要的 Id 记录，您就会执行以下操作:

user.save(function (err, data) {
  if(err) {
    //handle the error
  } else {
    res.send(200, data._id);
  }
});

在这里，我们利用了每个 Mongo 记录的 ObjectID 都存储为其 _id 属性这一事实。如果您只使用 Mongo 而不是 ODM，您还可以在保存记录后搜索记录并以这种方式获取 _id 属性。

collection.find(/* search criteria */, function (err, data) {
  //same as before
});