angular-fullstack 服务器重启后 Mongoose populate() 为空

Question

我有 "Video" 猫鼬模式，它引用了 "owner"，这是对 "User" 模式的引用。我正在使用 Angular-Fullstack Yeoman 生成器

video.model.js:

'use strict';
// load the things we need
var mongoose = require('mongoose'), Schema = mongoose.Schema;

var videoSchema = mongoose.Schema({

    type             : { type: String, enum: ['youtube', 'vimeo', 'local'], required: true },
    owner            : { type: String, ref: 'User', required : true },
    date             : { type: Date, default: Date.now },
    name             : { type: String, required: true },
    sourcemedia      : { type: String, required: true, unique: true}

});

// keep our virtual properties when objects are queried
videoSchema.set('toJSON', { virtuals: true });
videoSchema.set('toObject', { virtuals: true });

用户模式（样板 Yeoman angular-fullstack 代码）：

'use strict';

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var crypto = require('crypto');
var authTypes = ['github', 'twitter', 'facebook', 'google'];

var UserSchema = new Schema({
  name: String,
  email: { type: String, lowercase: true },
  role: {
    type: String,
    default: 'user'
  },
  hashedPassword: String,
  provider: String,
  salt: String,
  facebook: {},
  google: {},
  github: {}
});

/**
 * Virtuals
 */
UserSchema
  .virtual('password')
  .set(function(password) {
    this._password = password;
    this.salt = this.makeSalt();
    this.hashedPassword = this.encryptPassword(password);
  })
  .get(function() {
    return this._password;
  });

// Public profile information
UserSchema
  .virtual('profile')
  .get(function() {
    return {
      'name': this.name,
      'role': this.role
    };
  });

// Non-sensitive info we'll be putting in the token
UserSchema
  .virtual('token')
  .get(function() {
    return {
      '_id': this._id,
      'role': this.role
    };
  });

/**
 * Validations
 */

// Validate empty email
UserSchema
  .path('email')
  .validate(function(email) {
    if (authTypes.indexOf(this.provider) !== -1) return true;
    return email.length;
  }, 'Email cannot be blank');

// Validate empty password
UserSchema
  .path('hashedPassword')
  .validate(function(hashedPassword) {
    if (authTypes.indexOf(this.provider) !== -1) return true;
    return hashedPassword.length;
  }, 'Password cannot be blank');

// Validate email is not taken
UserSchema
  .path('email')
  .validate(function(value, respond) {
    var self = this;
    this.constructor.findOne({email: value}, function(err, user) {
      if(err) throw err;
      if(user) {
        if(self.id === user.id) return respond(true);
        return respond(false);
      }
      respond(true);
    });
}, 'The specified email address is already in use.');

var validatePresenceOf = function(value) {
  return value && value.length;
};

/**
 * Pre-save hook
 */
UserSchema
  .pre('save', function(next) {
    if (!this.isNew) return next();

    if (!validatePresenceOf(this.hashedPassword) && authTypes.indexOf(this.provider) === -1)
      next(new Error('Invalid password'));
    else
      next();
  });

/**
 * Methods
 */
UserSchema.methods = {
  /**
   * Authenticate - check if the passwords are the same
   *
   * @param {String} plainText
   * @return {Boolean}
   * @api public
   */
  authenticate: function(plainText) {
    return this.encryptPassword(plainText) === this.hashedPassword;
  },

  /**
   * Make salt
   *
   * @return {String}
   * @api public
   */
  makeSalt: function() {
    return crypto.randomBytes(16).toString('base64');
  },

  /**
   * Encrypt password
   *
   * @param {String} password
   * @return {String}
   * @api public
   */
  encryptPassword: function(password) {
    if (!password || !this.salt) return '';
    var salt = new Buffer(this.salt, 'base64');
    return crypto.pbkdf2Sync(password, salt, 10000, 64).toString('base64');
  }
};

module.exports = mongoose.model('User', UserSchema);

我有一个控制器，它具有获取一个视频的功能 (exports.show) 和一个获取多个视频的功能 (exports.index)，video.controller.js:

'use strict';

var _ = require('lodash');
var Video = require('./video.model');

// Get list of videos
exports.index = function(req, res) {
  Video.find()
  .populate('owner')
  .exec(function (err, videos) {
    console.log("Pulled videos:", videos);
    if(err) { return handleError(res, err); }
    return res.json(200, videos);
  });
};

// Get a single video
exports.show = function(req, res) {
  Video.findById(req.params.id)
  .populate('owner')
  .exec(function (err, video) {
    if(err) { return handleError(res, err); }
    if(!video) { return res.send(404); }
    return res.json(video);
  });
};

如果将视频添加到数据库并在重新启动服务器之前对其进行查询，则一切都会按预期运行。 populate 函数有效，每个视频都会填充一个 "owner"。一旦服务器重新启动，任何查询的所有所有者都是 null，我不知道为什么。如果我查看 Mongo CLI 中的文档，视频有 "owner" 这是用户的字符串“_id”（这是预期的）。

> mongo
MongoDB shell version: 2.4.12
> db.videos.find()
{ "owner" : "550a11cb5b3bf655884fad40", "type" : "youtube", "name" : "test", "sourcemedia" : "xxxxxxx", "_id" : ObjectId("550a11d45b3bf655884fad41"), "date" : ISODate("2015-03-18T04:00:00Z"), "__v" : 0 }

我尝试使用 Schema.Type.ObjectId 作为视频 "owner" 的类型，但我得到了相同的结果：

    owner            : { type: Schema.Types.ObjectId, ref: 'User', required : true },

为什么我的视频的 "owner" 属性返回 null？

Mongo版本：2.4.12 Mongoose 版本：3.8.24

Answer 1

呸！使用 angular-fullstack 生成器，用户的 table 会在您每次重新启动服务器时自动重新播种。我的填充没有工作，因为每次重新启动时唯一用户 _id 都被擦除。

在 server/config/seed.js 中找到了这条评论，它告诉了我解决方案...

/**
 * Populate DB with sample data on server start
 * to disable, edit config/environment/index.js, and set `seedDB: false`
 */

为了解决我改变了server/config/environment/development.js对象（对我来说在第8行）

seedDB: true

到

seedDB: false

angular-fullstack 服务器重启后 Mongoose populate() 为空

Mongoose populate() is null after server restart in angular-fullstack

mongoose

node.js

angularjs

angular-fullstack