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 与此行：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;
}

Answer 2

您的代码中一定有其他事情正在影响这一点。这个例子对我来说按预期工作：

'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);
});

我得到了一个写到控制台的有效 ID。