node.js - Mongoose findOne 未完成

Question

在尝试调试自己并搜索谷歌后，我的 Mongoose findOne 尚未完成!它到达了终点线，但并没有结束，直到大约 2 分钟后暂停。这是按调用顺序排列的代码

----------------路由

// process the signup form
app.post('/signup', passport.authenticate('local-signup', {
    successRedirect : '/profile', // redirect to the secure profile section
    failureRedirect : '/', // redirect back to the home page if there is an error
    failureFlash : true // allow flash messages
}));

------------ 护照处理

passport.use('local-signup', new LocalStrategy({
        // by default, local strategy uses username and password, we will override with email
        usernameField    : 'email',
        passwordField    : 'password',
        passReqToCallback: true // allows us to pass in the req from our route (lets us check if a user is logged in or not)
    },
    function (req, email, password, done) {

        // asynchronous
        process.nextTick(function () {
            //  Whether we're signing up or connecting an account, we'll need
            //  to know if the email address is in use.
            UserController.findUserByEmail(email, function (existingUser) {
                console.log(existingUser);
                // check to see if there's already a user with that email
                if (existingUser)
                    return done(null, false, req.flash('signupMessage', 'That email is already taken.'));

                //  If we're logged in, we're connecting a new local account.
                if (req.user) {
                    var user = req.user;
                    user.email = email;
                    user.password = encrypt.encrypt(password);
                    user.save(function (err) {
                        if (err)
                            throw err;
                        return done(null, user);
                    });
                }
                //  We're not logged in, so we're creating a brand new user.
                else {
                    console.log("there");
                    // create the user
                    User.createUser(req.body.username, email, req.body.username, password, "0", 1, function (result) {
                        return done(null, result);
                    });
                }

            });
        });

    }));

------------------创建数据客户端(UserController)

exports.findUserByEmail = function(email, callback){
User.findOne({email : email}, function(err, result){
    if(err){
        throw err;
    }else{
        callback(result);
    }
});
};

------------------用户架构

//user Schema
var userSchema = mongoose.Schema({
name : String,
email  : String,
userName : String,
password : String,
IP : String,
//type of user. It can be a user admin 0, user student 1, user presentor (professor) 2, (user     guest 3) ?.
type : Number
});

//instance of my schema
var User = mongoose.model('User', userSchema);

代码运行到 User.findOne() 之前；然后就挂起。添加一些调试语句表明调用了该方法之前的所有内容，但它从未进入回调。它只是坐着等待。

对其他架构的其他查询运行良好，并且返回速度非常快。

我为 Mongoose 添加了一个错误事件监听器，但没有任何结果。

我的 Express 服务器也仅在连接打开后运行，因此排除了这种情况。

如果您能提供任何帮助，我们将不胜感激!

-斯蒂芬

Answer 1

我也遇到了同样的问题。对我来说问题是我正在使用 mongoose.createConnection

let connection = mongoose.createConnection(url, ...)

但随后尝试使用 Mongoose 来创建模型

let Tank = mongoose.model('Tank', yourSchema);

当您使用 createConnection 时，您需要使用该连接 - https://mongoosejs.com/docs/models.html#constructing-documents .

let Tank = connection.model('Tank', yourSchema);