Mongoose 深度填充仅返回 ID 而不是整个 Object/Array

Question

这个问题在这里已经被问死了，但似乎没有明确的答案。

所以我有一个数据库，其中用户有很多主题、Post 和评论，一个主题有很多帖子，Post 有很多评论。

添加用户、主题、Posts 和评论工作正常。主题也通过填充其中的帖子来显示。（有轻微的重定向故障）。但我无法在帖子中填充评论。这是我到目前为止所拥有的。

主题控制器中的 Gettopic 方法

  gettopic: function(req, res){
    console.log("get_topic query", req.body._id)
    Topic.findOne({_id: req.body._id}).populate('posts').populate('posts.comments').exec(function (err, topic) {
        if(err){
            console.log("Something went Wrong");
            res.json(err)
        }else{
            console.log(topic);
            res.json(topic);
        }
        })
    }

主题模型

var TopicSchema = new mongoose.Schema({
  topic: String,
  description: String,
  category: String,
  post_count: Number,
  user_name: String,
  _User: {type: Schema.Types.ObjectId, ref: 'User'},
  posts: [{type: Schema.Types.ObjectId, ref: 'Post'}],
  created_at: Date
});

Post 型号

var PostSchema = new mongoose.Schema({
  post: String,
  up_vote: Number,
  down_vote: Number,
  user_name: String,
  _User: {type: Schema.Types.ObjectId, ref: 'User'},
  _Topic: {type: Schema.Types.ObjectId, ref: 'Topic'},
  comments: [{type: Schema.Types.ObjectId, ref: 'Comment'}],
  created_at: Date
});

评论模型

var CommentSchema = new mongoose.Schema({
  comment: String,
  user_name: String,
  _User: {type: Schema.Types.ObjectId, ref: 'User'},
  _Post: {type: Schema.Types.ObjectId, ref: 'Post'},
  created_at: Date
});

查找 Topic.findOne 即使填充 "Posts" 也能正常工作，但在填充评论时，只有 ID 显示，在后端和前端都有 console.log。

如您所见，它尚未完全填充数组，只能将其视为终端中的 [OBJECT] 和 JS 控制台中的 Id。

我做错了什么？

console.log(JSON.stringify(topic.posts,undefined,2))

{
  "_id": "56b3f865fe0aca747e9dae4f",
  "topic": "New topic in new DB",
  "description": "Testing Phase 1",
  "category": "HTML",
  "user_name": "Ani",
  "post_count": 0,
  "__v": 7,
  "posts": [
    {
      "_id": "56b3f880fe0aca747e9dae50",
      "post": "Posting Answer Phase 1",
      "user_name": "Ani",
      "up_vote": 0,
      "down_vote": 0,
      "created_at": "2016-02-05T01:18:56.709Z",
      "__v": 3,
      "comments": [
        "56b40368004a0707806e4b93",
        "56b4046beef00e4c82126269",
        "56b406656171e44383374cf0"
      ]
    },
    {
      "_id": "56b4061a51c0d3f282b89a95",
      "post": "Answer/Post V.2.0",
      "user_name": "Ani",
      "up_vote": 0,
      "down_vote": 0,
      "created_at": "2016-02-05T02:16:58.575Z",
      "__v": 1,
      "comments": [
        "56b4062551c0d3f282b89a96"
      ]
    }

console.log(JSON.stringify(主题,未定义,2))

"posts": [
    {
      "_id": "56b3f880fe0aca747e9dae50",
      "post": "Posting Answer Phase 1",
      "user_name": "Ani",
      "up_vote": 0,
      "down_vote": 0,
      "created_at": "2016-02-05T01:18:56.709Z",
      "__v": 3,
      "comments": [
        "56b40368004a0707806e4b93",
        "56b4046beef00e4c82126269",
        "56b406656171e44383374cf0"
      ]
    },
    {
      "_id": "56b4061a51c0d3f282b89a95",
      "post": "Answer/Post V.2.0",
      "user_name": "Ani",
      "up_vote": 0,
      "down_vote": 0,
      "created_at": "2016-02-05T02:16:58.575Z",
      "__v": 1,
      "comments": [
        "56b4062551c0d3f282b89a96"
      ]
    }

Answer 1

您可以尝试使用 mongoose-deep-populate 深度嵌套对象插件

var deepPopulate = require('mongoose-deep-populate');

Topic.findOne({
        _id: req.body._id
    }).deepPopulate('posts posts.comments').exec(function (err, topic) {
        if (err)
            res.json(err)
        else{
            console.log(topic);
            res.json(topic);
        };
    });

Mongoose 深度填充仅返回 ID 而不是整个 Object/Array

Mongoose deep populate returning only ID not the entire Object/Array

javascript

mongoose

mongodb

node.js

mean-stack