无法在 REST API 之外使用 Mongoose 查询 MongoDB

Question

这快把我逼疯了。 Express 路由器适用于 Mongoose 模型，但我无法在没有路由的其他文件中使用模型。每次我尝试使用导入的模型或猫鼬模式运行文件时，它都会在控制台中返回空白。我在用户路由器文件中以完全相同的方式调用该函数。

///////////////////////////////
//File: test.js (not working)//
///////////////////////////////

var user = require('./user');


user.getUserById({_id:'5c902f4c75d827057cc5ad17'}, function(err, user){
    if(err) return console.error(err);
    console.log(user);
});

////////////////////////////
//User model file: user.js//
////////////////////////////


var mongoose = require('mongoose');
mongoose.Promise = global.Promise;

mongoose.set('debug', true);

var bcrypt = require('bcryptjs');

const moment = require('moment');

var UserSchema = new mongoose.Schema({


    username: { type: String, required: true },
    email: { type: String, required: true },
    firstname: { type: String, required: true },
    lastname: { type: String, required: true },
    password: { type: String, required: true },
    chargeApiId: { type: String, required: false },
    address: { type: String, required: false },
    state: { type: String, required: true },
    county: { type: String, required: true },
    businessname: { type: String, required: false },
    updated_date: { type: String, default: moment(new Date()).format("DD/MM/YYYY HH:mm:ss") },
    activated: {type: Boolean, required: false},
    active_sub: {type: String, required: false},
    lastlogin: { type: String, required: false },
    datecreated: { type: String, required: true }
  });

  var User = mongoose.model('User', UserSchema);

module.exports = User;

module.exports.test = function(id, callback) {
  console.log('test');
  User.findById(id, callback);
}

module.exports.getUserById = function(id, callback) {
  User.findById(id, callback);
  
}

module.exports.getUserByUsername = function(username, callback) {
    const query = {username: username};
    User.findOne(query, callback);
}

// Method to compare password for login
module.exports.comparePassword = function (candidatePassword, res, callback) {
    bcrypt.compare(candidatePassword, res, (err, isMatch) => {
      if (err) { return callback(err); }
      callback(null, isMatch);
    });
  };

//password hashing
module.exports.bcyprtPw = function (password) {

    var salt = bcrypt.genSaltSync(10);
    var hash = bcrypt.hashSync(password, salt);
    console.log(hash);
    return(hash);
}

编辑：我发现这篇文章似乎它可能是猫鼬本身的设置。有关如何解决此问题的任何想法？

How can I interact with MongoDB via Mongoose without Express?

Answer 1

我认为你应该将你的函数从文件 user.js 导出为

module.exports = { User , test, getUserById , ..etc}

并将所需的功能导入为

 const { User , test, getUserById } = require("./user.js");

你也可以参考这个答案。

Declare multiple module.exports in Node.js