node.js - MongoDB 在保存时消失属性

Question

嗨，我正在使用 MongoDB + Mongoose，我的应用程序中发生了一些奇怪的魔法。我将我的架构定义为

var schema = mongoose.Schema({
  username: {type: mongoose.Schema.ObjectId, ref: 'Profile' , required:true},
  user: {type: mongoose.Schema.ObjectId, ref: 'Profile' , required:true},
  message: String
});

当我保存文档时，新条目已保存并存储。它在用户名中包含一条消息和一个关于个人资料的引用，但缺少用户字段。

如果我将其重命名为 userId ，也会发生同样的情况:/注册了一个预保存监听器:在保存之前我的回调中已丢失

没有错误，我不知道如何处理这种情况。请帮忙。会称其为团队，但我买不起

编辑:完整架构

var mongoose = require('mongoose');

var schema = mongoose.Schema({
  username: {type: mongoose.Schema.ObjectId, ref: 'Profile' , required:true},
  user: {type: mongoose.Schema.ObjectId, ref: 'Profile' , required:true},
    message: String
});

var autoPopulate = function(next) {
  this.populate('user');
  this.populate('username');
    next();
  };

  var autoReduce = function(next) {
    if(this.username){
          this.username = this.username._id;
    }
    if(this.user){
          this.user= this.user._id;
    }
    next();
  };

schema.
    pre('findOne', autoPopulate).
    pre('find', autoPopulate).
    pre('save', autoReduce);


    module.exports = mongoose.model('News',schema);

请求正文

{
        "message": "Hi",
        "username": {
            "_id": "5a736607bee0360014fb28e6",
            "name": "Juventus Florin"
        },
        "user": {
            "_id": "5a736607bee0360014fb28e6",
            "name": "Juventus Florin"
        }
    }

代码

  app.put("/api/news", function(request, response) {

            response.header("Content-Type", "application/json");
            var payload = request.body;
            new News(payload).save(function(err) {
                 if(err){
                        response.status(500).send({"message": "This is an error!", "error":err, "payload":payload});
                 }else{
                        response.status(200).send(payload);
                 }
             });
        });

保存后有一个新条目，看起来像(用户名已填充)

{
        "message": "Hi",
        "username": {
            "_id": "5a736607bee0360014fb28e6",
            "name": "Juventus Florin"
        },
        "_id":"5a736607bee0360014fb278h"

    }

Answer 1

解决方案:对于一对一的引用，无需

this.user = this.user._id;

仅适用于一对多引用。删除了预保存监听器 autoReduce 并且它可以工作