Question

我正在创建一个对象注册（一个Mongoose Schema），我需要在Id中使用以下行设置User：registrationId: registration._id});

但是，Id仍为null，即使它是回调函数？当我检查数据库时注册有ID和Id当然，但不在回调中。如何在Id中设置Registration的{{1}}？

Edit2：改为最小的例子。这打印出两次User。

null

编辑：这是架构（我遗漏了一些不需要的字段）：

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);
  });
};

问题和解决方案：问题是客户端发送属性_id = null，这就是为什么MongoDB / Mongoose没有更新ID。

Answer 1

您的代码中必定还有其他内容正在影响这一点。这个例子对我有用：

'use strict';

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

mongoose.connect('mongodb://localhost/createid');

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

});

var Registration = mongoose.model('Registration', RegistrationSchema);

var reg = {
    userId: '1234',
    tripId: '2345',
    firstnameContact: 'Timothy',
    lastnameContact: 'Strimple',
    emailContact: 'tim@tstrimple.com'
};

Registration.create(reg, function(err, registration) {
    if(err) { throw err; }
    console.log(registration._id);
});

我将一个有效的ID写入控制台。

Answer 2

从req.body中删除_id修复了我的问题。

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

Mongoose对象id为null

2 个答案: