nodejs在学习使用jade模板、express框架及与mongodb数据库进行交互，做一个用户验证网站时遇到问题？

Question

网站能够正常连接数据库，各项配置应该均正确，但是在注册用户时无法保存至数据库并出现了如下问题，不太明白哪里undefined了。

E:\code\user-auth-example\node_modules\mongodb\lib\utils.js:98
    process.nextTick(function() { throw err; });
                                  ^

TypeError: Cannot read property 'email' of undefined
    at E:\code\user-auth-example\server.js:38:34
    at E:\code\user-auth-example\node_modules\mongodb\lib\collection.js:525:5
    at E:\code\user-auth-example\node_modules\mongodb\lib\collection.js:703:5
    at handleCallback (E:\code\user-auth-example\node_modules\mongodb\lib\utils.js:95:56)
    at executeCommands (E:\code\user-auth-example\node_modules\mongodb\lib\bulk\ordered.js:398:12)
    at resultHandler (E:\code\user-auth-example\node_modules\mongodb\lib\bulk\ordered.js:425:5)
    at E:\code\user-auth-example\node_modules\mongodb-core\lib\connection\pool.js:455:18
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)
    

然后下面是代码，比较多，package.json, express按照书上的方法用的是旧版本:

{
    "name":"user-auth-example",
    "version":"0.0.1",
    "dependencies":{
        "express":"2.5.8",
        "mongodb":"2.2.24",
        "jade":"0.31.2"
    }
}

server.js:

var express=require('express'),Db = require('mongodb').Db,Server = require('mongodb').Server

app=express.createServer();

var db = new Db('test01', new Server('localhost', 27017));

db.open(function(err,client){
    if(err)
        throw err;
    console.log('\033[96m  + \033[39m connected to mongodb');
    app.users=db.collection('users');
    app.listen(3000,function(){
        console.log('\033[96m  + \033[39m app listening on *:3000');
    });
});

app.use(express.bodyParser());
app.use(express.cookieParser());
app.use(express.session({secret:'my secret'}));

app.set('view engine','jade');
app.set('view options',{layout:false});

app.get('/',function(req,res){
    res.render('index',{authenticated:false});
});

app.get('/login/:signupEmail?', function (req, res) {
  res.render('login', { signupEmail: req.params.signupEmail });
});

app.get('/signup',function(req,res){
    res.render('signup');
});
app.post('/signup', function (req, res, next) {
  app.users.insert(req.body.user, {safe:true}, function(err,doc) {
    if (err) return next(err);
    res.redirect('/login/'+doc[0].email);
  });
});

四个放在当前目录下views文件夹的jade，laydout.jade:

doctype 5
html
  head
    title MongoDB example
  body
    h1 My first MongoDB app
    hr
    block body

index.jade:

include layout
block body
if (authenticated)
  p Welcome back, #{me.name}
  a(href="/logout") Logout
else
  p Welcome new visitor!
  ul
    li: a(href="/login") Login
    li: a(href="/signup") Signup

login.jade:

include layout
block body
if (signupEmail)
  p Congratulations on signingup! Please login below.
form(action="/login", method="POST")
  fieldset
    legend Log in
    p
      label Email
      input(name="user[email]", type="text", value=signupEmail)
    p
      label Password
      input(name="user[password]", type="password")
    p
      button Submit
    p
      a(href="/") Go back

signup.jade:

include layout
block body
form(action="/signup", method="POST")
  fieldset
    legend Sign up
    p
      label First
      input(name="user[first]", type="text")
    p
      label Last
      input(name="user[last]", type="text")
    p
      label Email
      input(name="user[email]", type="text")
    p
      label Password
      input(name="user[password]", type="password")
    p
      button Submit
    p
      a(href="/") Go back
      

最后吐槽一下Smashing Node.js这本书，真的太多错误了。然后若有大神能够回答此问题真的感激不敬！

Answer 1

insert方法的RESULT不是你插入的doc，详细你可以查看官方api：链接描述

api建议使用insertOne不建议使用insert

Answer 2

app.post('/signup', function (req, res, next) {
  app.users.insert(req.body.user, {safe:true}, function(err,doc) {
    if (err) return next(err);
    res.redirect('/login/'+doc[0].email);
  });
});

上面你的注册代码，其中
.insert(req.body.user, {safe:true},...

insert中插入出了问题，req.body.user,键名呢

Answer 3

你最好看下这个app.users.insert方法，返回的是什么

Answer 4

建议你如果想要一个比较全面的node教程可以去看这个nswbmw/N-blog一起学 Node.js