节点没有多次连接到Mongo

Question

尝试设置MEAN服务器，遵循本教程:https://hackhands.com/mongodb-crud-mvc-way-with-passport-authentication/

使用git:https://github.com/Hitman666/MEAN_MVC_3rdTutorial

第一次我连接到数据库，它工作得很好。在CTRL+C之后，然后再次运行"node server"，我得到这个错误:

c:mean2node_modulesmongoosenode_modulesmongodblibmongodbconnectionbase.js:246 throw message;^ TypeError:无法读取未定义的属性'length' at processResults (c:mean2node_modulesmongoosenode_modulesmongodblibmongodbdb.js:1581:31) at c:mean2node_modulesmongoosenode_modulesmongodblibmongodbdb.js:1619:20 at c:mean2node_modulesmongoosenode_modulesmongodblibmongodbdb.js: 157:7 at c:mean2node_modulesmongoosenode_modulesmongodblibmongodbdb.js:1890:9 at Server.Base。_callHandler (c:mean2node_modulesmongoosenode_modulesmongodblibmongodbconnectionbase.js:448:41) at c:mean2node_modulesmongoosenode_modulesmongodblibmongodbconnectionserver.js:481:18 at MongoReply。parseBody (c:mean2node_modulesmongoosenode_modulesmongodblibmongodbresponsesmongo_reply.js:68:5) at null。(c:mean2node_modulesmongoosenode_modulesmongodblibmongodbconnectionserver.js:439:20) at emit (events.js:107:17) at null。(c: 非常刻薄 node_modules 猫鼬 node_modules 连接mongodb lib mongodb connection_pool.js: 201:13)

相关代码块:

development.js:

var port = 1337;
module.exports = {
    port: port,
    db: 'mongodb://localhost/todos'
};

mongoose.js:

var config = require('./config'),
mongoose = require('mongoose');
module.exports = function() {
    var db = mongoose.connect(config.db);
    return db;
};

config.js:

module.exports = require('./env/' + process.env.NODE_ENV + '.js');

server.js:

process.env.NODE_ENV = process.env.NODE_ENV || 'development';
var config = require('./config/config'),
    mongoose = require('./config/mongoose'),
    express = require('./config/express'),
var db = mongoose(),
    app = express();
app.listen(config.port);
module.exports = app;
console.log(process.env.NODE_ENV  + ' server running at http://localhost:' + config.port);

同样值得注意的是，如果我再次执行db.dropDatabase()然后再执行"node server"，它会正常工作。

Answer 1

问题是"npm install mongoose"没有安装正确版本的mongoose。有一次我编辑了这个包。

Answer 2

在终止应用程序之前，我使用了这个小代码片段来关闭与MongoDB的连接:

process.on('SIGINT', function() {
    mongoose.close(function(){
        process.exit();
    });
});