Express Node.js應用程序使用Mongoose丟失與MongoLab數據庫的連接

Question

因此，在嘗試了一大堆事情之後，我使用Heroku與MongoLab服務器建立了連接。唯一的問題是我真的去我的網站之前，它給了我一個Process exited with status 1（下面的完整日誌）。該應用程序在我的本地服務器上運行得很好。以下是app.js代碼。該應用程序本身在brads-testing.herokuapp.com。

app.js：

//requires and start up app 
var express = require('express'); 
var mongoose = require('mongoose') 
    , dbURI = 'localhost/test'; 
var app = express(); 

//configures app for production, connects to mongoLab databse rather than localhost 
app.configure('production', function() { 
    //app.use(express.logger()); 
    console.log("production!"); 
    dbURI = 'mongodb://USERNAME:PASSWORD@ds037387.mongolab.com:37387/test'; 
}); 

//configures app for general stuff needed 
app.configure(function() { 
    //app.use(express.logger()); 
    app.use(express.bodyParser()); 
    app.use(express.static(__dirname + '/static')); 
}); 

//tries to connect to database. If it does, connected set to true. If not, connected stays false 
var connected = false; 
mongoose.connect(dbURI); 
mongoose.connection.on('open', function() { 
    console.log("connected!"); 
    connected = true; 
    //creates new schema for object post and saves it to the database 
    var postSchema = new mongoose.Schema({ 
     body: String 
    }); 

    var Post = mongoose.model('Post', postSchema); 

    app.set('views', __dirname + '/views'); 
    app.set('view engine','jade'); 

    app.get('/', function(request, response) { 
     response.render('index'); 
    }); 

    app.post('/result', function(request, response) { 
    if (connected) { 
     var post = new Post({body: request.body.text}); 
     console.log(post); 
     post.save(function (err) { 
      if (err) { 
       console.log("error!"); 
      } else { 
       console.log("saved!"); 
      } 
     }); 

     Post.find(function (err, posts) { 
      if (!err) { 
       console.log("found!"); 
       console.log(posts); 
       response.render('result', {posts: posts}); 
      } else { 
       connected = false; 
       var error = "The server had an issue sending/executing the query..." 
       response.render('result_error', {error: error}); 
      } 
     }); 
     } else { 
     var error = "The server didn't end up connecting..." 
     response.render('result_error', {error: error}); 
     } 
    }); 

    app.get('/result', function (request, response) { 
     if (connected) { 
     Post.find(function (err, posts) { 
      if (!err) { 
       console.log("found!"); 
       console.log(posts); 
       response.render('result', {posts: posts}); 
      } else { 
       connected = false; 
       var error = "The server had an issue sending/executing the query..." 
       response.render('result_error', {error: error}); 
      } 
     }); 
     } else { 
      var errorText = "The server didn't end up connecting..." 
      response.render('result_error', {error: errorText}); 
     } 
    }); 

    app.listen(process.env.PORT || 5000); 

}); 
mongoose.connection.on('error', console.error.bind(console, 'connection error:')); 

終端登錄：

2012-08-22T19:19:26+00:00 heroku[web.1]: Starting process with command `node app.js` 
2012-08-22T19:19:26+00:00 heroku[web.1]: Stopping all processes with SIGTERM 
2012-08-22T19:19:28+00:00 app[web.1]: production! 
2012-08-22T19:19:28+00:00 app[web.1]: connected! 
2012-08-22T19:19:28+00:00 heroku[web.1]: State changed from starting to up 
2012-08-22T19:19:29+00:00 heroku[web.1]: Process exited with status 1 

悲哀的是，所述connected!消息和Process exited with status 1是種可互換的。有時候一個先到另一個，有時候卻是相反的。希望有人能幫助。

Answer 1

這將是很高興獲得更多的日誌信息。我代稱，這裏有一些東西在自己的環境中嘗試：

• 某些驅動程序已知不與MongoDB中的所有版本。 MongoLab正在運行2.0.x，這是目前最新的穩定代碼行。但是，當我們處於2.2.x GA版本的尖端時，有一些驅動程序，特別是一些驅動程序版本，需要2.2.x的最新開發版本。我不確定Mongoose是否是其中之一，但您應該嘗試在本地運行您的MongoLab實例正在運行的相同版本。

• MongoLab數據庫以auth模式運行，並且用戶僅被授予對其自己的數據庫的權限（出於明顯的安全原因）。這意味着某些命令（例如列出所有數據庫）將失敗。因此，請嘗試以auth模式運行本地數據庫並以非管理員用戶身份進行身份驗證。