我正在学习在我的表单应用程序中使用passport-js，并且我在使用此模型将用户保存在数据库中的应用程序中正在使用用户对象，但当我返回已创建的用户对象并尝试使用findOne方法更新该对象时，我遇到了user.findOne is not a function错误。这是我的代码。
事先谢谢你帮我。
user.js看起来像这个
var mongoose = require("mongoose");
var passportLocalMongoose = require("passport-local-mongoose");
var usersSchema = new mongoose.Schema({
username:String,
password:String,
email:String
});
usersSchema.plugin(passportLocalMongoose);
module.exports = mongoose.model("User",usersSchema);
我的signup页面看起来像这个
<!DOCTYPE html>
<html>
<head>
<title></title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link href="https://fonts.googleapis.com/css2?family=Mitr:wght@500&display=swap" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="css/biodata.css">
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
<a class="navbar-brand justify-content-around" id="navbar-home" href="/">Home</a>
<div class="ml-auto" id="navbar-joint">
<a class="navbar-brand" href="/signup">Sign Up</a>
<a class="navbar-brand" href="/logout">Logout</a>
</div>
</nav>
<div class="card" id="signup-card">
<div class="card-body" id="signup-card-body">
<form action="/register" method="POST">
<h3 class="d-flex justify-content-center">SIGN UP</h3>
<div class="form-group">
<input type="text" class="form-control form-control-lg" id="username" name="username" placeholder="Username">
</div>
<div class="form-group">
<input type="email" class="form-control" id="email" name="email" placeholder="Email">
</div>
<div class="form-group">
<input type="password" class="form-control form-control-lg" id="inputPassword" name="inputPassword" placeholder="Password">
</div>
<div class="form-group">
<input type="password" class="form-control form-control-lg" id="confirminputPassword" name="confirminputPassword" placeholder="Confirm Password">
</div>
<div class="form-check">
<input type="checkbox" class="form-check-input" id="exampleCheck1" name="exampleCheck1">
<label class="form-check-label" for="exampleCheck1">I agree</label>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary btn-lg btn-block">Submit</button>
</div>
</form>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>
我的app.js看起来像这个
var express = require("express");
var app = express();
var mongoose = require("mongoose");
var passport = require("passport"),
localStrategy = require("passport-local");
const User = require("./models/User");
var expressSession = require("express-session");
mongoose.connect('mongodb://localhost/users', {useNewUrlParser: true, useUnifiedTopology: true}).catch(function(reason){
console.log('Unable to connect to the mongodb instance. Error: ', reason);
});
app.set('view engine', 'ejs');
var bod = require("body-parser");
app.use(bod.urlencoded({extended:true}));
app.use(passport.initialize());
app.use(passport.session());
app.use(expressSession({
secret:"the key",
resave:false,
saveUninitialized:false
}));
passport.use(new localStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());
app.use(express.static(__dirname + '/resources'));
/*
var usersSchema = new mongoose.Schema({
username:String,
password:String,
email:String
});
var user = mongoose.model("User",usersSchema);
*/
app.get("/", function(req, res) {
res.render("home");
});
app.get("/home", function(req, res) {
res.render("home");
});
//problem method
app.post("/register",function(req,res){
var userName = req.body.username;
var inputPassword = req.body.inputPassword;
var email = req.body.email;
var exampleCheck1 = req.body.exampleCheck1;
var confirminputPassword = req.body.confirminputPassword;
if(exampleCheck1==="on"){
if(inputPassword===confirminputPassword){
User.register( new User({username:userName}),inputPassword, function(err,user){
console.log(user);
// here I tried to cast the returned object into User.js object but it didn't work
// user = new User();
if(err){
console.log(err);
return res.render("signup");
}
//I am trying to update returned object with email, I am not sure if this is the correct way to do it, would welcome suggestions. but at this point the user.findOne is not a function error is thrown.
user.findOne({username:userName},function(err,user){
user.email = email;
user.save();
console.log(user);
});
passport.authenticate("local")(req,res,function(){
res.render("bioform",{userName:userName});
});
});
}else{
console.log("Passwords doesn't match!!!");
res.render("signup");
}
}else{
console.log("Agree to Terms!!!");
res.render("signup");
}
});
//
app.get("/signup", function(req, res) {
res.render("signup");
});
app.listen(3000,function(){
console.log("Server started");
});
您正试图在从passport-local-moongoose调用register返回的对象中调用findOne。
相反，您应该通过User模型调用它：
const User = require("./models/User");
[...]
User.register(new User({ username: userName }), inputPassword, function(err, user) {
[...]
// Use User model instead of the object returned in User.register.
User.findOne({ username: userName }, function(err, user) {
// Your logic here.
});
});