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express报错“TypeError: Cannot read property 'Store' of undefined”

 
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使用node.js 的express框架配置将session存储到mongodb时出错:

TypeError: Cannot read property 'Store' of undefined

 

express版本:3.3.4

connect-mongo:0.3.3

一开始按照网上的一些资料加载connect-mongo模块的写法为:

//加载模块

var MongoStore= require("connect-mongo");

 

//配置express session

app.use(express.session({

   secret:setting.cookieSecret,

   db: seeting.db

}));

 

启动程序报错:TypeError: Cannot read property 'Store' of undefined

 

经过排查和资料,查看connect-mongo的Readme.md,其中有段描述为:

 

With express:

 

    var express = require('express');

    var MongoStore = require('connect-mongo')(express);

 

    app.use(express.session({

        secret: settings.cookie_secret,

        store: new MongoStore({

          db: settings.db

        })

      }));

 

With connect:

 

    var connect = require('connect');

    var MongoStore = require('connect-mongo')(connect);

 

 

将var MongoStore= require("connect-mongo");修改为:

 var MongoStore = require('connect-mongo')(express);

 

 

重启启动OK,问题解决!

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