我想注册一个用户。我将数据保存到数据库，但是之后出现错误
无法读取null的属性“ firstname”。本来以为主体可以为空，但是当我键入console.log（req.body）;时，它显示了保存的数据。我认为问题是我注册后该会话已关闭，但我不知道如何解决。 如果有人可以帮忙，我会很高兴！ 有人
var express = require("express");
var app = express();
var path = require("path");
const https = require("https");
const fs = require("fs");
var mongoose = require("mongoose");
mongoose.connect("mongodb://localhost/WeSports");
var connection = mongoose.connection;
var bodyParser = require("body-parser");
var passport = require("passport");
var LocalStrategy = require("passport-local");
var User = require("./models/user.js");
const multer = require("multer");
const storage = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, "./uploads/");
},
filename: function(req, file, cb) {
cb(null, new Date().toISOString() + file.originalname);
}
});
const fileFilter = (req, file, cb) => {
// reject a file
if (file.mimetype === "image/jpeg" || file.mimetype === "image/png") {
cb(null, true);
} else {
cb(null, false);
}
};
const upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 5
},
fileFilter: fileFilter
});
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use("/uploads", express.static("uploads"));
app.use(
require("express-session")({
secret: "Logged in",
resave: false,
saveUninitialized: false
})
);
connection.once("open", function() {
connection.db.collection("user-data", function(err, collection) {
if (err) {
console.error("An error occurred connecting to MongoDB: ", err);
} else {
collection.find({}).toArray(function(err, data) {
if (err) {
console.error("An error occurred connecting to MongoDB: ", err);
} else {
console.log(data); // it will print your collection data
}
});
}
});
});
app.set("view engine", "ejs");
app.use(passport.initialize());
app.use(passport.session());
passport.use(new LocalStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());
app.use("/", express.static(path.join(__dirname, "public")));
app.get("/", function(req, res) {
var tagline = "Hello";
res.render("Login", {
tagline: tagline
});
});
app.post("/insert", upload.single("picture"), function(req, res) {
var user = {
picture: req.file.path,
firstname: req.body.firstname,
name: req.body.name,
city: req.body.city,
birthday: req.body.birthday,
phonenumber: req.body.phonenumber,
email: req.body.email,
aboutme: req.body.aboutme
};
var data = new User(user);
data.save();
console.log(req.body);
User.register(
new User({
picture: req.file.path,
username: req.body.username,
firstname: req.body.firstname,
name: req.body.name,
city: req.body.city,
birthday: req.body.birthday,
phonenumber: req.body.phonenumber,
_id: req.body.email,
aboutme: req.body.aboutme
}),
req.body.password,
function(err, User) {
if (err) {
console.log(err);
return res.render("SignIn");
} //user stragety
passport.authenticate("local")(req, res, function() {
res.redirect("/profile/" + req.body.email); //once the user sign
up;
});
}
);
console.log(req.body);
});
app.get("/SignIn", function(req, res) {
User.find().then(function(doc) {
res.render("SignIn", { user: doc });
});
});
app.post(
"/",
passport.authenticate("local", {
failureRedirect: "/"
}),
(req, res) => {
User.findOne({ username: req.body.username }, function(err, obj) {
console.log(obj);
console.log(obj._id);
res.redirect("dashboard/" + obj._id);
});
}
);
var isLoggedIn = function(req, res, next) {
if (req.isAuthenticated()) {
return next();
}
res.redirect("/");
};
/*function(req, res){
res.send("User is "+ req.user.id);
});*/
app.param("id", function(req, res, next, _id) {
User.findById(_id, function(err, doc) {
if (err) res.json(err);
else {
req.userId = doc;
next();
}
});
});
/* app.get('dashboard', (req, res, next) => {
upload.findOne({_id: req.params.id}, (err, image) => {
if (err) return res.sendStatus(404);
fs.createReadStream(path.resolve('./uploads', image.filename)).pipe(res);
});
});*/
app.get("/dashboard/:id", isLoggedIn, function(req, res) {
res.render("dashboard", { user: req.userId });
});
app.get("/profile/:id", isLoggedIn, function(req, res) {
res.render("profile", { user: req.userId });
});
/*app.get('/loggedin/:id', isLoggedIn, function(req, res){
res.render("/profile/"+req.body.email);
});
*/
app.get("/Users", function(req, res) {
User.find().then(function(doc) {
res.render("Users", { user: doc });
});
});
//app.get("/Profil",isLoggedIn, function(req, res){
//if (req.session && req.session.username !== true) {
// User.find()
//.then(function(doc) {
//res.render('Profil', {items: doc});
// });
// }
// console.log( req.sessionID);
//});
/*app.post("/", passport.authenticate("local",{
successRedirect:"/Profil",
failureRedirect:"/"
})*/
是的，没错，我使用multipart / form-data，因为我想上传并显示图像。我没有上传图片就尝试过。它可以，但是现在我不知道如何实现上传图片。
<form action='/insert' method='post' enctype="multipart/form-data" class="inhalte-werden-zentriert">
<!--Einleitung des Formulars-->
<p>add profile picture:<br>
<label for="file"></label>
<input class="button" type="file" name="picture" accept="image/png,
image/jpeg" />
</p>
<label for="username"></label>
</br>
<input type="text" name="username" placeholder="username" required autofocus="autofocus" pattern="[a-zA-Z]{2,}" id="username"><br>
<label for="firstname"></label>
</br>
<input type="text" autofocus name="firstname" placeholder="firstname" pattern="[a-zA-Z]{2,}" id="firstname"><br>
<!--Definition des einzeiligen Eingabefelds "Vorname" mit Platzhalter und
Autofokus + verpflichtendes Feld-->
<label for="name"></label>
</br>
<input type="text" name="name" placeholder="name" id="name" required pattern="[a-zA-Z]{2,}"><br>
<!--Definition des einzeiligen Eingabefelds "Nachname" mit Platzhalter +
verpflichtendes Feld-->
<label for="city"></label>
</br>
<input type="text" name="city" placeholder="city" id="city" required pattern="[a-zA-Z]{2,}"><br>
<!--Definition des einzeiligen Eingabefelds "Wohnort" mit Platzhalter-->
<label for="birthday"></label>
</br>
<input type="date" name="birthday" id="birthday" placeholder="TT.MM.JJJJ" required><br>
<label for="phonenumber"></label>
</br>
<input type="tel" pattern="[0-9]{1,}" name="phonenumber" id="phonenumber" placeholder="phonenumber"><br>
<!--Definition des einzeiligen Eingabefelds "Telefonnummer" mit Platzhalter
und Zahlen im Bereich von 0-9-->
<label for="email"></label>
</br>
<input type="email" name="email" id="email" placeholder="email" required>
<br>
<!--Definition des einzeiligen Eingabefelds "eMail" mit Platzhalter +
verpflichtendes Feld-->
<label for="password"></label>
</br>
<input type="password" id="password" name="password" placeholder="password" required><br>
<label for="aboutme"></label>
</br>
<textarea name="aboutme" id="aboutme" rows="6" cols="30" placeholder="aboutme" required></textarea><br>
<!--Textbereich mit 6 Reihen und 30 Spalten + Platzhalter-->
<input class="abschicken" type="submit" value="Save" />
<!--einzeiliges Eingabefeld "Abschicken"-->
</form>