0
我沿着Udemy教程跟随。到目前为止，一切都运行良好，直到我将应用程序连接到mongodb。应用程序运行正常，连接到数据库，但是当我访问表单页面时，应该会显示数据库中的数据，应用程序崩溃并给我以下错误。Nodejs应用程序在访问表单页面时崩溃
app.js文件
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var appRoutes = require('./routes/app');
var app = express();
mongoose.connect('localhost:27017/node-angular2');
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'hbs');
// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(function (req, res, next) {
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
res.setHeader('Access-Control-Allow-Methods', 'POST, GET, PATCH, DELETE, OPTIONS');
next();
});
app.use('/', appRoutes);
// catch 404 and forward to error handler
app.use(function (req, res, next) {
return res.render('index');
});
module.exports = app;路由器/ app.js
var express = require('express');
var router = express.Router();
var User = require('../models/user');
router.get('/', function (req, res, next) {
User.findOne({}, function(err, doc) {
if (err) {
return res.send('Error!');
}
res.render('node', {email: doc.email});
});
});
router.post('/', function(req, res, next) {
var email = req.body.email;
var user = new User({
firstName: 'Max',
lastName: 'Schwarz',
password: 'super-secret',
email: this.email
});
user.save();
res.redirect('/');
});
module.exports = router;错误日志
> node ./bin/www
events.js:160
throw er; // Unhandled 'error' event
^
TypeError: Cannot read property 'email' of null
at /Users/farooqkhan/Documents/Udemy/node-angular2/routes/app.js:11:39
at Query.<anonymous> (/Users/farooqkhan/Documents/Udemy/node-angular2/node_modules/mongoose/lib/model.js:3381:16)
at /Users/farooqkhan/Documents/Udemy/node-angular2/node_modules/kareem/index.js:259:21
at /Users/farooqkhan/Documents/Udemy/node-angular2/node_modules/kareem/index.js:127:16
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickCallback (internal/process/next_tick.js:98:9)
npm ERR! Darwin 16.1.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "start"
npm ERR! node v6.9.1
npm ERR! npm v3.10.8
npm ERR! code ELIFECYCLE
npm ERR! [email protected] start: `node ./bin/www`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script 'node ./bin/www'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the udemy-nodejs-angular2 package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node ./bin/www
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs udemy-nodejs-angular2
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls udemy-nodejs-angular2
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /Users/farooqkhan/Documents/Udemy/node-angular2/npm-debug.log
第二个例子。
然后我运行了一个mongodb IDE，我从github获得了。它曾经工作正常，但现在当我访问首页时，它也给出了以下错误：
> node app.js
(node:1054) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.
adminMongo listening on host: http://0.0.0.0:1234
GET/302 8.496 ms - 56
/Users/farooqkhan/Documents/mongoIDE/adminMongo/node_modules/mongodb/lib/mongo_client.js:237
throw err
^
TypeError: Cannot read property 'indexOf' of undefined
at module.exports (/Users/farooqkhan/Documents/mongoIDE/adminMongo/node_modules/parse-mongo-url/index.js:10:10)
at new Database (/Users/farooqkhan/Documents/mongoIDE/adminMongo/node_modules/mongojs/lib/database.js:43:20)
at module.exports (/Users/farooqkhan/Documents/mongoIDE/adminMongo/node_modules/mongojs/index.js:5:12)
at /Users/farooqkhan/Documents/mongoIDE/adminMongo/routes/index.js:58:22
at connectCallback (/Users/farooqkhan/Documents/mongoIDE/adminMongo/node_modules/mongodb/lib/mongo_client.js:315:5)
at /Users/farooqkhan/Documents/mongoIDE/adminMongo/node_modules/mongodb/lib/mongo_client.js:234:11
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickCallback (internal/process/next_tick.js:98:9)
npm ERR! Darwin 16.1.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "start"
npm ERR! node v6.9.1
npm ERR! npm v3.10.8
npm ERR! code ELIFECYCLE
npm ERR! [email protected] start: `node app.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script 'node app.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the admin-mongo package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node app.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs admin-mongo
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls admin-mongo
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /Users/farooqkhan/Documents/mongoIDE/adminMongo/npm-debug.log
我不明白这里有什么错。一切都很好，我不知道突然发生了什么。我甚至尝试重新安装MongoDB，但没有任何帮助。
你的'app.js'文件和错误日志的来源只会比错误日志更有用。 – aring
您需要将body-parser模块安装为中间件，以便'req.body'属性正确包含您的表单数据。你必须从你遵循的例子中错过了这一步。 – jfriend00
body-parser是在主app.js文件中导入的。上面的代码是来自routes/app.js – TheLearner