javascript - Express APP如何将用户重定向到/:id path from server side

Question

我正在学习 Node.js，我发现将用户重定向到 :id 路径时遇到了一些麻烦。我想在那里打印他的用户名。因此，为了进行概述，它是一个带有表单的登录页面，我在其中请求别名和电子邮件。当用户单击提交时，我想将他移至/:id 路径以打印其用户名。我的代码如下:

var express  = require("express"),
    app      = express(),
    request  = require("request"),
    mongoose = require("mongoose"),
    bodyParser = require("body-parser");

app.set("view engine", "ejs")
app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended: true}));

mongoose.connect("mongodb://localhost/Scape_Room", {useNewUrlParser: true, useUnifiedTopology: true});
var userSchema = new mongoose.Schema({
    email: String,
    alias: String,
});

var user = mongoose.model ("user",userSchema);

app.get("/", function(req, res){
    res.render("index")
})

app.post("/newuser", function(req,res){
    var name = req.body.name;
    var email = req.body.email;
    var newUser = {name:name, email:email}
    user.create(newUser, function(err,newlyUser){
        if(err){
           console.log(err)
           } else {
               res.redirect("/start/:id")
           }
    })
})

app.get("/start/:id", function(req,res){
    user.findById(req.params.id, function(err, foundUser){
        if(err){
            console.log(err)
        } else{
            res.render("startPoint", {user:foundUser})
        }
    })
})

app.listen(3000, function(err){
        console.log("Server listening")
})

错误如下:{ CastError: Cast to ObjectId failed for value ":id"at path "_id"for model "user"

我试过:- 将路径更改为 :_id- 添加 start/到 route

Answer 1

当您使用 redirect() 方法时，您必须传递一个真实的路由 url 而不是一个 id。

const express = require("express")
const request = require("request");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const app = express();

app.set("view engine", "ejs")
app.use(express.static("public"));

mongoose.connect("mongodb://localhost/Scape_Room", { useNewUrlParser: true, useUnifiedTopology: true });

const userSchema = new mongoose.Schema({
  email: String,
  alias: String,
});

const user = mongoose.model("user", userSchema);

app.get("/", function (req, res) {
  res.render("index");
});

app.post("/newuser", function (req, res) {
  const { name, email } = req.body;
  if (!name || !email) {
    return res.end();
  }

  const newUser = { name: name, email: email }
  user.create(newUser, function (err, newlyUser) {
    if (err) {
      console.log(err);
      return res.end();
    }

    if (!newlyUser) {
      console.log("Couldn't save user!");
      return res.end();
    }

    if (!newlyUser.id) {
      console.log("No user id found");
      return res.end();
    }

    res.redirect(`/start/${newlyUser.id}`);
  });
});

app.get("/start/:id", function (req, res) {
  user.findById(req.params.id, function (err, user) {
    if (err) {
      console.log(err);
    } else {
      res.render("startPoint", { user });
    }
  })
})

app.listen(3000, function (err) {
  console.log("Server listening")
});