从node.js应用程序调用时,Mongoose Model.save()会挂起

Question

我正在尝试学习node和mongo,以便构建一个简单的Web应用程序/自学一些关于Web应用程序的内容.但是,当我调用Model.save()时,似乎永远不会执行continuation函数,并且不会保存数据.

这是我到目前为止所拥有的:

/* app.js */

var express = require('express')
  , app = express()
  , routes = require('./routes')
  , http = require('http')
  , path = require('path')
  , mongoose = require('mongoose')
  , db 
  , Track
  , models = require('./models.js');

app.configure(function(){
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'ejs');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(express.cookieParser('secretstuff'));
  app.use(express.session());
  app.use(app.router);
  app.use(require('less-middleware')({ src: __dirname + '/public' }));
  app.use(express.static(path.join(__dirname, 'public')));
  app.use(function(err, req, res, next){
    console.error(err.stack);
    res.send(500, 'Something broke!');
  });
});

models.defineModels(mongoose, function(){
  app.Track = Track = mongoose.model('Track');
  db = mongoose.createConnection('localhost','nextrak')
});

app.get('/', routes.index);

app.get('/dbTest', function(req, res){
  console.log("Here goes...");
  var t = new Track({
    name: "TestTrack",
    artist: "Artist",
    tags: ["test"],
    next: ["track1","track2"]
  });
  console.log("Test Track:");
  console.log(t);

  t.save(function(){
    if(err)
      console.log("Error! Couldn't complete dbTest successfully.");
    else
      console.log("Aw yiss, got dbTest working");
  })
});

http.createServer(app).listen(app.get('port'), function(){
  console.log("Express server listening on port " + app.get('port'));
});


/*models.js*/

function defineModels(mongoose, cont){
  var Schema = mongoose.Schema;
  Track = new Schema({
    'name': { type: String, index: true },
    'artist': String,
    'tags': [String],
    'next': [String],
  });
  mongoose.model('Track', Track);
  cont();
}

exports.defineModels = defineModels;

不会抛出任何错误,并且mongo日志表明我启动应用程序时会启动5个新连接.不显示新日志([clientcursormon]日志除外).当我在Chrome中加载/ dbTest时,应用程序打印出以下内容:

开始...

  Test Track:
    { name: 'TestTrack',
      artist: 'Basik',
      _id: 5031606aa11cf95815000001,
      next: [ 'track1', 'track2' ],
      tags: [ 'test' ] }

Mongo似乎配置正确.当我有节点运行Mongoose引导您完成的简单"入门"脚本时,一切正常.

谁能指出我做错了什么？

Answer 1

您尚未为Mongoose创建默认使用的连接.替换这个:

db = mongoose.createConnection('localhost','nextrak')

有了这个:

db = mongoose.connect('localhost', 'nextrak');

结合其他尼特:

1. 您将Track在models.js中设置为全局变量
2. 您需要err在t.save回调中添加一个参数.