Javascript 我似乎无法引用2个模式来填充

这些是我想要参考的两个模式。 我希望ListingScheme用户id引用userScheme的_id。这是2天的工作，请帮助

var userScheme = new Schema({
email: { type: String },
password: { type: String },
fullName: { type: String },
coverPhoto: { type: String},
profilePhoto: { type: String},
fbUserID: { type: String},
profileExtraInfo: { type: Array},
listings: {type: Schema.Types.ObjectId, ref: "Listings"}

var listingsScheme = new Schema({
category: { type: String, index: true }, 
title: { type: String },
description: { type: String },
attributes: { type: Array },
nrViews: {type: Number },
photos: { type: Array },
location: { type: Array, index: '2d' },
created: { type: Date, index: true },
updated: { type: Date },
active: { type: Boolean, index: true } ,
userId : { type: Schema.Types.ObjectId, ref : 'User' } ,
fullName : { type: String },
profilePhoto : { type : String},
followers : {type : String},

---

除了语法错误之外，代码应该可以正常工作

记住使用复数模型名（您有'User'=>'users'）

别忘了为你的模式建模

不要忘记使用.populate（'userId'）方法

不要忘记连接服务器（发生的频率比您想象的要高）

确保您的文档确实相互连接

测试代码：

var mongoose  = require('mongoose');

//  connect with database.
mongoose.connect('mongodb://localhost:27017/temp');

var userScheme = new mongoose.Schema({
  email: { type: String },
  password: { type: String },
  fullName: { type: String },
  coverPhoto: { type: String},
  profilePhoto: { type: String},
  fbUserID: { type: String},
  profileExtraInfo: { type: Array},
  listings: {type: mongoose.Schema.Types.ObjectId, ref: "Listings"}
});

var listingsScheme = new mongoose.Schema({
  category: { type: String, index: true }, 
  title: { type: String },
  description: { type: String },
  attributes: { type: Array },
  nrViews: {type: Number },
  photos: { type: Array },
  location: { type: Array, index: '2d' },
  created: { type: Date, index: true },
  updated: { type: Date },
  active: { type: Boolean, index: true } ,
  userId : { type: mongoose.Schema.Types.ObjectId, ref : 'User' } ,
  fullName : { type: String },
  profilePhoto : { type : String},
  followers : {type : String}
});

//  don't forget to 'model' your scheme.
var users    = mongoose.model('User', userScheme);
var listings = mongoose.model('listings', listingsScheme);

//  create mock user.
var user = new users({
  email:'test'
});

//  create mock listing with the user_id attached to property userId.
var listing = new listings({
  userId:user._id
});

//  save the created user and listing.
user.save();
listing.save();

//  find ONE document in the collection 'listings'.
//  populate the userId.
//  execute the function and let mongoose call your callback.
listings.findOne().populate('userId').exec(function(err, doc)
{
  //  ensure there are no errors.
  if(!err && doc)
  {
    //  print the doc we found.
    //  should give userdoc inside userId property.
    console.log(doc);
  }
});

//  clear collections.
//users.remove({});
//listings.remove({});

---

Runnable link:

我已经按照你说的做了所有的事情，但是当我使用Listings.find（queryString）、populate（userId）时，它仍然不起作用。你看到了什么？您是否获得没有嵌入用户文档的列表？Try:

Listings.find（）.populate（'userId'）.exec（回调）