NPM啓動帶來的誤差

Question

我下面這個教程：https://thinkster.io/mean-stack-tutorial

我在那裏我開始用MongoDB的工作

要啓動MongoDB的我用這個命令的一部分：sudo mongod &

我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 routes = require('./routes/index'); 
var users = require('./routes/users'); 
var mongoose = require('mongoose'); 
require('./models/Posts'); 
require('./models/Comments'); 

mongoose.connect('mongodb://localhost/news'); 

var app = express(); 

// view engine setup 
app.set('views', path.join(__dirname, 'views')); 
app.set('view engine', 'ejs'); 

// 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('/', routes); 
app.use('/users', users); 

// catch 404 and forward to error handler 
app.use(function(req, res, next) { 
    var err = new Error('Not Found'); 
    err.status = 404; 
    next(err); 
}); 

// error handlers 

// development error handler 
// will print stacktrace 
if (app.get('env') === 'development') { 
    app.use(function(err, req, res, next) { 
    res.status(err.status || 500); 
    res.render('error', { 
     message: err.message, 
     error: err 
    }); 
    }); 
} 

// production error handler 
// no stacktraces leaked to user 
app.use(function(err, req, res, next) { 
    res.status(err.status || 500); 
    res.render('error', { 
    message: err.message, 
    error: {} 
    }); 
}); 


module.exports = app; 

和我的index.js文件（路徑）：

var express = require('express'); 
var router = express.Router(); 

var mongoose = require('mongoose'); 
var Post = mongoose.model('Post'); 
var Comment = mongoose.model('Comment'); 

/* GET home page. */ 
router.get('/', function(req, res, next) { 
    res.render('index', { title: 'Express' }); 
}); 

router.get('/posts', function(req, res, next){ 
    var post = new Post(req.body); 

    Post.save(function(err, posts){ 
     if(err){return next(err);} 

     res.json(posts); 
    }); 
}); 


module.exports = router; 

然後當我在終端上鍵入npm start我得到這些錯誤：

jsantana@jsantana-Inspiron-3521:~/Documents/mean/flapper_news/flapper-news$ npm start 

> flapper-news@0.0.0 start /home/jsantana/Documents/mean/flapper_news/flapper-news 
> node ./bin/www 


/home/jsantana/Documents/mean/flapper_news/flapper-news/node_modules/mongoose/lib/index.js:333 
     throw new mongoose.Error.MissingSchemaError(name); 
    ^
MissingSchemaError: Schema hasn't been registered for model "Post". 
Use mongoose.model(name, schema) 
    at Mongoose.model (/home/jsantana/Documents/mean/flapper_news/flapper-news/node_modules/mongoose/lib/index.js:333:13) 
    at Object.<anonymous> (/home/jsantana/Documents/mean/flapper_news/flapper-news/routes/index.js:5:21) 
    at Module._compile (module.js:425:26) 
    at Object.Module._extensions..js (module.js:432:10) 
    at Module.load (module.js:356:32) 
    at Function.Module._load (module.js:311:12) 
    at Module.require (module.js:366:17) 
    at require (module.js:385:17) 
    at Object.<anonymous> (/home/jsantana/Documents/mean/flapper_news/flapper-news/app.js:8:14) 
    at Module._compile (module.js:425:26) 
    at Object.Module._extensions..js (module.js:432:10) 
    at Module.load (module.js:356:32) 
    at Function.Module._load (module.js:311:12) 
    at Module.require (module.js:366:17) 
    at require (module.js:385:17) 
    at Object.<anonymous> (/home/jsantana/Documents/mean/flapper_news/flapper-news/bin/www:7:11) 

npm ERR! Linux 3.16.0-51-generic 
npm ERR! argv "/home/jsantana/local/bin/node" "/home/jsantana/local/bin/npm" "start" 
npm ERR! node v5.0.0 
npm ERR! npm v3.3.6 
npm ERR! code ELIFECYCLE 
npm ERR! flapper-news@0.0.0 start: `node ./bin/www` 
npm ERR! Exit status 1 
npm ERR! 
npm ERR! Failed at the flapper-news@0.0.0 start script 'node ./bin/www'. 
npm ERR! This is most likely a problem with the flapper-news 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 their info via: 
npm ERR!  npm owner ls flapper-news 
npm ERR! There is likely additional logging output above. 

npm ERR! Please include the following file with any support request: 
npm ERR!  /home/jsantana/Documents/mean/flapper_news/flapper-news/npm-debug.log 

下面是一個包含文件夾結構，github上： https://github.com/jsantana90/meanstacktutorial

問題

如何解決這個錯誤？我對MEAN堆棧和MongoDB很陌生。

謝謝您的時間！

Answer 1

您必須首先定義路線

之前，需要你的貓鼬型號不正確，你有這樣的順序：

var routes = require('./routes/index'); 
var users = require('./routes/users'); 
var mongoose = require('mongoose'); 
require('./models/Posts'); 
require('./models/Comments'); 

mongoose.connect('mongodb://localhost/news'); 

試試這個順序：

var mongoose = require('mongoose'); 

mongoose.connect('mongodb://localhost/news'); 

require('./models/Posts'); 
require('./models/Comments'); 

var routes = require('./routes/index'); 
var users = require('./routes/users');