MongoDB：錯誤設置集合上的TTL索引：會話

Question

最初，此錯誤消息開始出現很少，但開始出現更經常，現在出現4/5次我運行我的應用程序。

我正在使用Mongo處理會話存儲，據我瞭解，TTL索引用於使會話數據過期。

/home/dan/dev/audio-wave/node_modules/connect-mongo/lib/connect-mongo.js:161 
      throw new Error('Error setting TTL index on collection : ' + s 
       ^
Error: Error setting TTL index on collection : sessions 
at /home/dan/dev/audio-wave/node_modules/connect-mongo/lib/connect-mongo.js:161:23 
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1404:28 
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1542:30 
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:159:22 
at commandHandler (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:678:48) 
at Db._executeQueryCommand (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1802:12) 
at Cursor.nextObject (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:729:13) 
at Cursor.toArray (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:158:10) 
at Cursor.toArray (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/scope.js:10:20) 
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1541:65 

下面是捆綁一起

var sessionStore = new MongoStore({ db: 'audio-drop' }) 
    , cookieParser = express.cookieParser('waytoblue') 
    , SessionSockets = require('session.socket.io') 
    , sockets = new SessionSockets(io, sessionStore, cookieParser); 

app.set('port', process.env.PORT || 3000); 
app.set('views', __dirname + '/views'); 
app.set('view engine', 'ejs'); 
app.use(express.favicon()); 
app.use(express.bodyParser()); 
app.use(express.methodOverride()); 
app.use(express.static(path.join(__dirname, 'public'))); 
app.use(express.logger('dev')); 
app.use(cookieParser); 
app.use(express.session({ 
    store: sessionStore 
})); 

據db.version()從蒙戈外殼的代碼，我跑2.4.9和我使用的connect-mongo版本0.4.0。

似乎有很多人遇到過這個問題，但似乎大多數人都認爲是憑證問題，我的本地mongo沒有通過身份驗證進行安全保護，所以這不成問題。有任何想法嗎？

Answer 1

正如我在評論中所說的，Express會在會話存儲完全連接之前接收連接。解決方案是在允許應用程序開始收聽之前等待連接發生。

您可以通過在創建MongoStore時使用回調或傳入已激活的連接來避免此問題。

例使用connect-mongo的回調

var sessionStore = new MongoStore({ url: 'someConnectionUrl', db: 'audio-drop' }, function(e) { 

    var cookieParser = express.cookieParser('waytoblue'); 
    app.use(cookieParser); 

    app.use(express.session({ 
    store: sessionStore 
    })); 

    app.listen(); 
}); 

簡單的貓鼬例

var mongoose = require('mongoose'); 

mongoose.connect('localhost', function(e) { 
    // If error connecting 
    if(e) throw e; 

    var sessionStore = new MongoStore({ mongoose_connection: mongoose.connection }), 
     cookieParser = express.cookieParser('waytoblue'); 

    app.use(cookieParser); 

    app.use(express.session({ 
    store: sessionStore 
    })); 

    app.listen(); 
}); 

Answer 2

升級連接 - 蒙戈版本0.8.0這爲我工作。

Answer 3

角fullstack例如

It's只是封裝了所有其他的東西了mongoose.connect回調函數內

見我服務器/ app.js

/** 
* Main application file 
*/ 

'use strict'; 

// Set default node environment to development 
process.env.NODE_ENV = process.env.NODE_ENV || 'development'; 

var express = require('express'); 
var mongoose = require('mongoose'); 
var config = require('./config/environment'); 

// Connect to database 
mongoose.connect(config.mongo.uri, config.mongo.options , function(e){ 


// Populate DB with sample data 
    if(config.seedDB) { require('./config/seed'); } 

// Setup server 
    var app = express(); 
    var server = require('http').createServer(app); 
    var socketio = require('socket.io')(server, { 
    serveClient: (config.env === 'production') ? false : true, 
    path: '/socket.io-client' 
    }); 
    require('./config/socketio')(socketio); 
    require('./config/express')(app); 
    require('./routes')(app); 

// Start server 
    server.listen(config.port, config.ip, function() { 
    console.log('Express server listening on %d, in %s mode', config.port, app.get('env')); 
    }); 

// Expose app 
    exports = module.exports = app; 

}); 

希望能幫助到你！！