Mongoose 5.0.16，获取无法读取未定义的属性“替换”

Question

我创建了一个新的 Node、Express、Mongo 应用程序，但在设置 MongoDB 时突然出现 Mongoose 错误。

Server Listening to Port: 9001 
C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\auth\scram.js:130
username = username.replace('=', '=3D').replace(',', '=2C');
                   ^

TypeError：无法读取未定义的“替换”属性

 at executeScram (C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\auth\scram.js:130:24)
 at C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\auth\scram.js:299:7
 at _combinedTickCallback (internal/process/next_tick.js:73:7)
 at process._tickCallback (internal/process/next_tick.js:104:9) [nodemon] app crashed - waiting for file changes before starting...

我设置 MongoDB 的代码是：

const session    = require('express-session');
const mongoose   = require('mongoose');
const mongoStore = require('connect-mongo')(session);

// Local connection
let mongoConnectionLocal = { 
    'url': `mongodb://${process.env.MongoDBLocalUser}:${process.env.MongoDBLocalPassword}@127.0.0.1:27017/my-database`
};    

mongoose.connect(mongoConnectionLocal.url, {auth:{authdb:"admin"}}, err => { if(err) { console.log(err); }});

这太奇怪了，因为这段代码适用于 Mongoose 4.13.2 及更低版本（我尝试卸载 5.0.16 版本，然后安装 4.13.2 版本，它可以正常工作）。 Mongoose 实现 MongoDB 连接有什么变化吗？

更新：有人说使用默认值，使用默认值会产生这个错误：

 default: mongoose.connect(mongoConnectionLocal.url, err => { if(err) { console.log(err); }});

{ MongoError: Authentication failed.
at C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\connection\pool.js:598:61
at authenticateStragglers (C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\connection\pool.js:516:16)
at Connection.messageHandler (C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\connection\pool.js:552:5)
at emitMessageHandler (C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\connection\connection.js:309:10)
at Socket.<anonymous> (C:\Users\Sarwin\Desktop\Sarwin\Projects\SchoolProject\node_modules\mongoose\node_modules\mongodb-core\lib\connection\connection.js:452:17)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at Socket.Readable.push (_stream_readable.js:134:10)
at TCP.onread (net.js:551:20)
name: 'MongoError',
message: 'Authentication failed.',
ok: 0,
errmsg: 'Authentication failed.',
code: 18,
codeName: 'AuthenticationFailed' }
(node:20124) UnhandledPromiseRejectionWarning: Unhandled promise rejection 
(rejection id: 1): MongoError: Authentication failed.

Answer 1

已通过删除连接 URI 中的用户名和密码解决此问题

不要以这种方式建立猫鼬连接，

const session    = require('express-session');
const mongoose   = require('mongoose');
const mongoStore = require('connect-mongo')(session);

// Local connection
let mongoConnectionLocal = { 
    'url':`mongodb://${process.env.MongoDBLocalUser}:${process.env.MongoDBLocalPassword}@127.0.0.1:27017/my-database`
};    

mongoose.connect(mongoConnectionLocal.url, {auth:{authdb:"admin"}}, err => { if(err) { console.log(err); }});

创建一个选项并在那里设置数据库用户名和密码，

var options = {
  auth: {authdb: 'admin'},
  user: process.env.MongoDBLocalUser,
  pass: process.env.MongoDBLocalPassword,
}

let mongoConnectionLocal = { 
    'url': `mongodb://127.0.0.1:27017/my-database`
}; 

mongoose.connect(mongoConnectionOnline.url, options, err => { if(err) { console.log(err); }}); 

而且它有效。

注意：有人在评论中说我使用了错误的凭据，但我对新旧版本的 mongoose 使用了相同的凭据，并且两者都有效。

其他人也遇到了这个问题。见：MongoDB Auth Fails to find username on Bitnami MEAN Stack Image

[参考]https://github.com/Automattic/mongoose/issues/4891