Heroku 上的 Node.js Express 应用程序无法使用 Mongoose 连接到 MongoLab 数据库

Question

我正在尝试让我的 node.js Express 应用程序使用 Mongoose 连接到 Heroku 上的 MongoLab 数据库。我已经使用 app.configure 将我的数据库 URI 设置为 production 上的 MongoLab URI，正如您在 Heroku 日志中看到的那样，它肯定设置了 dbURI 到 MongoLab URI。我肯定已经将我的 NODE_ENV 设置为 production。我的问题是什么？

app.js:

var express = require('express');
var mongoose = require('mongoose')
  , dbURI = 'localhost';
var app = express();

app.configure('production', function () {
    console.log("production!");
    dbURI = 'mongodb://brad.ross.35:Brad1234@ds031347.mongolab.com:31347/heroku_app6861425';
    console.log(dbURI);
});

mongoose.connect(dbURI, 'test');
mongoose.connection.on('error', console.error.bind(console, 'connection error:'));

var postSchema = new mongoose.Schema({
    body: String
});

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

app.configure(function () {
    //app.use(express.logger());
    app.use(express.bodyParser());
    app.use(express.static(__dirname + '/static'));
});

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

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

app.post('/result', function(request, response) {
    var post = new Post({body: request.body.text});
    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 {
            console.log("error!");
            response.render('result', {posts: []});
        }
    });
});

app.get('/result', function (request, response) {
    Post.find(function (err, posts) {
        if (!err) {
            console.log("found!");
            console.log(posts);
            response.render('result', {posts: posts});
        } else {
            console.log("error!");
            response.render('result', {posts: []});
        }
    });
});

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

Heroku 日志:

2012-08-21T16:52:21+00:00 heroku[web.1]: State changed from crashed to starting
2012-08-21T16:52:22+00:00 heroku[slugc]: Slug compilation finished
2012-08-21T16:52:23+00:00 heroku[web.1]: Starting process with command `node app.js`
2012-08-21T16:52:24+00:00 app[web.1]: production!
2012-08-21T16:52:24+00:00 app[web.1]: mongodb://brad.ross.35:PASSWORD@ds031347.mongolab.com:31347/heroku_app6861425
2012-08-21T16:52:24+00:00 app[web.1]: connection error: [Error: failed to connect to [ds031347.mongolab.com:31347/heroku_app6861425:27017]]
2012-08-21T16:52:25+00:00 heroku[web.1]: State changed from starting to up

Answer 1

传递 URI 时，无需单独传递数据库名称(这会使 mongoose 感到困惑)。

就这样

var uri = 'mongodb://brad.ross.35:Brad1234@ds031347.mongolab.com:31347/heroku_app6861425'
mongoose.connect(uri)

要使用测试数据库，请更改您的 uri:

var uri = 'mongodb://brad.ross.35:Brad1234@ds031347.mongolab.com:31347/test'