Node.js 中间件不适用于第二个模型，即医生，但它适用于管理员。在这里，我创建了一个两用户模型，一个是管理员，一个是医生

我试图建立一个两个用户登录系统一个是管理员，第二个是医生。在这里，我创建了一个中间件，它可以很好地用于第一个中间件，即admin，但如果是doctor，它会一次又一次地将我重定向到登录页面，尽管我的密码和用户名是正确的。 请有人告诉我如何为两个模型身份验证创建中间件

    'use strict';
    var express = require("express"),
        app = express(),
        bodyParser = require("body-parser"),
        passport = require("passport"),
        LocalStrategy = require("passport-local"),
        mongoose = require('mongoose');


    var Admin = require("./models/admin");
    var Doctor = require("./models/doctor");


    var http = require('http');
    var port = process.env.PORT || 1337;


    //Set up default mongoose connection
    var mongoDB = 'mongodb://localhost:27017/seeddb';
    mongoose.connect(mongoDB, { useNewUrlParser: true });
    app.use(bodyParser.urlencoded({ extended: true }));
    app.set("view engine", "ejs");
    app.use(express.static(__dirname + "/public", { redirect: false }));

    //PASSPORT CONFIGURTION
    app.use(require("express-session")({
        secret: "Rockey is the best",`enter code here`
        resave: false,
        saveUninitialized: false,
    }));

    app.enable('trust proxy');

    app.use(passport.initialize());
    app.use(passport.session());
    app.use(require('flash')());
    //=========================================================

    //Admin Authentication
    passport.use('adminLocal', new LocalStrategy(Admin.authenticate()));
    passport.serializeUser(Admin.serializeUser());
    passport.deserializeUser(Admin.deserializeUser());

    //Doctor Authentication
    passport.use('doctorLocal', new LocalStrategy(Doctor.authenticate()));
    passport.serializeUser(Doctor.serializeUser());
    passport.deserializeUser(Doctor.deserializeUser());


    //=========================================================

    app.use(function (req, res, next) {    // to pass currentUser to each routes
        res.locals.currentUser = req.user;
        next();
    });

    //========================================================
    //Landing route
    //========================================================
    app.get('/', function (req, res) {
        res.render("clinic/landing");
    });

    //=========================================================
    //Admin routes
    //=========================================================
    app.get('/admin-login', function (req, res) {
        res.render("admin/login");
    });

    //Sign Up
    app.post('/admin-signup', function (req, res) {
        var newAdmin = new Admin({ username: req.body.username });
        Admin.register(newAdmin, req.body.password, function (err, admin) {
            if (err) {
                console.log(err);
                return res.redirect("/admin-login");
            }
            passport.authenticate("adminLocal")(req, res, function () { //local can be twitter fb for authentication
                console.log("Successfully signup Login to continue");
                res.redirect("/admin-login");
            });
        });
    });
    //Admin sign in
    // process the login form
    app.post('/admin-login', function (req, res, next) {
        passport.authenticate('adminLocal', { failureFlash: true }, function (err, admin, info) {
            if (err) { return next(err); }
            if (!admin) { return res.redirect('/admin-login'); }
            req.logIn(admin, function (err) {
                if (err) { return next(err); }
                return res.redirect('/admin/' + admin._id);
            });
        })(req, res, next);
    });

    //Admin home
    app.get('/admin/:id', isLoggedIn, function (req, res) {
        Admin.findById(req.params.id, function (err, admin) {
            if (err) {
                console.log(err);
            } else {
                Doctor.find({}).exec(function (err, doctors) {
                    if (err) throw err;
                    res.render("admin/adminhome", {"doctors" : doctors, admin: admin });
                });
            }
        });
    });

    //===============================================
    //Doctor routes
    //===============================================

    //Doctor login
    app.get('/doctor-login', function (req, res) {
        Admin.findById(req.params.id, function (err, admin) {
            if (err) {
                console.log(err);
            } else {
                res.render("doctors/login");
            }
        });

    });


    app.post('/doctor-signup', function (req, res) {
        var newDoctor = new Doctor({
            username: req.body.username,
            fname: req.body.fname,
            lname: req.body.lname,
            email: req.body.email,
            exp: req.body.exp,
            dept: req.body.dept,
            address: req.body.address,
            hospInfo: req.body.hospInfo,
            desc: req.body.description,
        });

        Doctor.register(newDoctor, req.body.password, function (err, doctor) {
            if (err) {
                console.log(err);
                return res.redirect("back");
            }
            passport.authenticate("doctorLocal")(req, res, function (){ //local can be twitter fb for authentication
                console.log("Doctor signup successfully Done");
                res.redirect("/doctor-login");
            });
        });
    });

    //Doctor sign in
    // process the login form
    app.post('/doctor-login', function (req, res, next) {
        passport.authenticate('doctorLocal', { failureFlash: true }, function (err, doctor, info) {
            if (err) { return next(err); }
            if (!doctor) { console.log("No doc found"); return res.redirect('/doctor-login'); }
            req.logIn(doctor, function (err) {
                if (err) { return next(err); }
                return res.redirect('/doctor/' + doctor._id);
            });
        })(req, res, next);
    });

    //doctor home
    app.get('/doctor/:id', isLoggedIn, function (req, res) {
        Doctor.findById(req.params.id, function (err, doctor) {
            if (err) {
                console.log(err);
            } else {
                res.render("doctors/doctorhome", { doctor: doctor });
            }
        });
    });


    // //middleware to check whether it is logged in or not
    function isLoggedIn(req, res, next) {
        if (req.isAuthenticated()) {
            return next();
        }
        res.redirect("back");
    }

---

请提供一个代码示例来演示这个问题抱歉，因为我刚刚接触堆栈溢出，我当时不知道如何添加代码，现在我编辑并添加了示例代码您的注释标志已被拒绝。请阅读。