Node.js TypeError:无法读取属性'$__'；属于未定义的-猫鼬v5^ 我认为这是async.js的一个问题，但我不知道为什么。

我已经研究这个问题好几个星期了，还没有发现任何结论。我正在学习教程，在创建新用户[创建新的mongodb文档（可能还有子文档）]时遇到问题。让我先从堆栈开始

基线是MongoDB Standalone、Express和NodeJS。在构建此模块时，我使用了此处列出的每个模块的最新版本：

"async": "^3.1.0",
"bcryptjs": "^2.4.3",
"body-parser": "^1.19.0",
"bootstrap": "^4.3.1",
"connect-flash": "^0.1.1",
"cookie-parser": "~1.4.4",
"debug": "~2.6.9",
"express": "~4.16.1",
"express-handlebars": "*",
"express-messages": "^1.0.1",
"express-session": "^1.16.2",
"express-validator": "^5.3.1",
"http-errors": "~1.6.3",
"mongodb": "^3.3.2",
"mongoose": "^5.7.3",
"morgan": "~1.9.1",
"passport": "^0.4.0",
"passport-http": "^0.3.0",
"passport-local": "^1.0.0",
"serve-favicon": "^2.5.0"

当我运行教程中的项目文件时，我使用的是旧版本的Mongoose。。。小于v5.0

我设置了几个陷阱，并将我的问题作为问题儿童深入到以下几行：

// Create Student User
module.exports.saveStudent = function(newUser, newStudent, callback){
    console.log('Made it here');
    bcrypt.hash(newUser.password, 10, function(err, hash){
        console.log('Made it to the hash');
        if(err) throw errl
        // Set hash
        console.log('No errors');
        newUser.password = hash;
        console.log('Student is being saved!');

        //************** Here's the Problem ****************
        async.parallel([newUser.save, newStudent.save], callback);

        console.log('handled async');
    });
}

我从未使用过最后一个console.log语句，因此我可以假设它从未处理过异步。因此，我没有将记录添加到数据库中，而是将其作为错误：

Made it here POST /users/register 302 183.633 ms - 46 Made it to the hash No errors Student is being saved! /Users/zp/Projects/Fortis_PHP/chl/node_modules/mongoose/lib/model.js:433 if (this.$__.saving) {
           ^

TypeError: Cannot read property '$__' of undefined
    at Model.save (/Users/zp/Projects/Fortis_PHP/chl/node_modules/mongoose/lib/model.js:433:12)
    at eachfn (/Users/zp/Projects/Fortis_PHP/chl/node_modules/async/dist/async.js:2952:28)
    at eachOfArrayLike (/Users/zp/Projects/Fortis_PHP/chl/node_modules/async/dist/async.js:504:13)
    at eachOf (/Users/zp/Projects/Fortis_PHP/chl/node_modules/async/dist/async.js:555:16)
    at awaitable(eachOf) (/Users/zp/Projects/Fortis_PHP/chl/node_modules/async/dist/async.js:208:32)
    at awaitify (/Users/zp/Projects/Fortis_PHP/chl/node_modules/async/dist/async.js:2951:9)
    at awaitable() (/Users/zp/Projects/Fortis_PHP/chl/node_modules/async/dist/async.js:208:32)
    at Object.parallel (/Users/zp/Projects/Fortis_PHP/chl/node_modules/async/dist/async.js:3033:16)
    at /Users/zp/Projects/Fortis_PHP/chl/models/user.js:53:15
    at /Users/zp/Projects/Fortis_PHP/chl/node_modules/bcryptjs/dist/bcrypt.js:1353:21
    at Immediate.next (/Users/zp/Projects/Fortis_PHP/chl/node_modules/bcryptjs/dist/bcrypt.js:1233:21)
    at runCallback (timers.js:705:18)
    at tryOnImmediate (timers.js:676:5)
    at processImmediate (timers.js:658:5)

因此，我正在寻找任何关于异步失败的地方以及如何保存记录的想法

在我所做的研究中，我看到其他人也有类似的问题，这似乎是我能找到的最接近的答案

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有人有什么想法吗@强尼，你知道吗