Mongoose populate()返回空数组,没有错误

Question

我一直试图让这个填充的东西工作,但我遇到了问题,因为我没有得到预期的结果,没有错误可以使用.只是一个空数组.

我的模特看起来像这样.每个自己的文件

var mongoose = require('mongoose');

var upgradeSchema = new mongoose.Schema({
  type: {
    type: String,
    default: "Any"
  },
  ability: String,
  ability_desc: String,
  level: Number,
  tag: String
});

mongoose.model('Upgrade', upgradeSchema);

和另外一个

var mongoose = require( 'mongoose' );
var crypto = require('crypto');
var jwt = require('jsonwebtoken');


var userSchema = new mongoose.Schema({
  email: {
    type: String,
    unique: true,
    required: true
  },
  hero: {
    level: Number,
    name: String,
    type: {
      path: String,
      heroType: String
    },
    upgrades: [{
      type: mongoose.Schema.Types.ObjectId, ref: 'Upgrade'
    }],
    unspent_xp: Number,
    total_xp: Number,
  },
  armyTotal: {
    type: Number,
    default: 0,
    max: 5000
  },
  army:[{
    foc_slot: String,
    unit_name: String,
    unit_cost: Number
  }],
  username: {
    type: String,
    required: true,
    unique: true,
  },
  faction: String,
  name: {
    type: String,
    required: true
  },
  hash: String,
  salt: String,
  roles: {
    type: String,
    default: 'player' }
});

而我正试图这样做

module.exports.profileRead = function(req, res) {


    User
      .findById(req.payload._id)
      .populate('hero.upgrades')
      .exec(function (err, user) {
        if (err){
          console.log(err);
        } else {
          res.status(200).json(user);
          console.log("success");
        }
      });
    }
};

这是用户的示例

{
    "_id" : ObjectId("57b4b56ea03757e12c94826e"),
    "hash" : "76",
    "salt" : "2",
    "hero" : {
        "upgrades" : [ 
            "57b42773f7cac42a21fb03f9"
        ],
        "total_xp" : 0,
        "unspent_xp" : 0,
        "type" : {
            "heroType" : "Psyker",
            "path" : ""
        },
        "name" : "Jon Doe"
    },
    "username" : "michaelzmyers",
    "faction" : "Grey Knights",
    "email" : "email@gmail.com",
    "name" : "Michael Myers",
    "roles" : "player",
    "army" : [],
    "armyTotal" : 625,
    "__v" : 3
}

现在,我已经尝试了一个包含ObjectId的字符串数组,类似于eample,我也尝试过使用ObjectId("STRINGHERE")而没有运气.它们都返回一个空数组.但是,如果我摆脱填充调用(或将填充内容从hero.upgrades更改为英雄或升级),那么它只返回一个字符串数组.我觉得问题在于填充以及我如何使用它.但是,当我在数据库中进行一次升级(测试升级)时,一切正常.现在什么都不行.有什么想法吗？如果需要,我很乐意提供更多代码.

Answer 1

我发现在我的小研究中它会起作用:

User
  .findById(req.payload._id)
  .populate({
       path: 'hero.upgrades',
       model: 'Upgrade'
   })
  .exec(function (err, user) {
    if (err){
      console.log(err);
    } else {
      res.status(200).json(user);
      console.log("success");
    }
  });
}

它看起来当用户正在给嵌套的对象表示法,即像hero.upgrades成populate方法,猫鼬得到了与检测参考模型的问题.