node.js - Mongoose 对象 ID 为空

Question

我正在创建一个对象注册(Mongoose 架构)，我需要在 User 中设置它的 Id 使用此行:registrationId:registration._id });

但是，Id 仍然是 null，即使它是回调函数？当我检查数据库时，注册当然有和 Id，但不在回调中。如何在User中设置Registration的Id？

Edit2:更改为最小示例。这会打印出两次 null。

exports.create = function(req, res) {
  Registration.create(req.body, function(err, registration) {
    if(err) { return handleError(res, err); }

    console.log(registration._id);
    console.log(registration.id);

    return res.json(201, registration);
  });
};

编辑:这是架构(我省略了一些不需要的字段):

'use strict';

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

var RegistrationSchema = new Schema({

    isReservation: Boolean,

    //Id of the trip
    tripId: String,

    //socialMutuality
    codeGerechtige: String,
    socialMutualityNumberParent1: String,
    socialMutualityNumberParent2: String,

    //contact
    userId: String,
    firstnameContact: String,
    lastnameContact: String,
    emailContact: String,
    streetContact: String,
    streetNumberContact: String,
    zipcodeContact: String,
    busContact: String,
    cityContact: String,
    phoneContact: String,
    gsmContact: String,
    socialSecurityNumberContact: String,

    //coordinats of person that pays

    //child information

    //emergency contacts
    emergencyContacts: [{
        firstName: String,
        lastName: String,
        phone: String
    }],

    extraInfo: String

});

module.exports = mongoose.model('Registration', RegistrationSchema);

问题与解决方案:问题是客户端发送属性_id = null，这就是MongoDB/Mongoose没有更新id的原因。

Answer 1

从 req.body 中删除 _id 解决了我的问题。

if(req.body._id === null) {
  delete req.body._id;
}