req.isAuthenticated（）如果使用store for cookie则返回false

Question

我有一些会话中间件

var session = require('express-session');
var config = require('config');

module.exports = session({
    secret: config.secret,
    resave: true, 
    saveUninitialized: true, 
    cookie: {
        secure: false,
        httpOnly : true,
        maxAge : 30 * 24 * 60 * 60 * 1000 //30days
    }
});

我还有授权用户的检查功能

var isAuthenticated = function (req, res, next) {
    console.log('----------------' + req.isAuthenticated()) // true
    if (req.isAuthenticated()) {
        res.locals.login = req.isAuthenticated();
        return next();
    } else {
        res.render('permissionDenied', {title: 'Permission denied'});
    }
};

一切都好。现在我可以登录我的网站并显示授权用户的其他选项卡。但是当我使用商店pg进行会话时

var pgSession = require('connect-pg-simple')(session);
module.exports = session({
    store: new pgSession({
        conString : config.databaseString
    }),
    secret: 'SECRET',
    resave: true, //don't save session if unmodified
    saveUninitialized: true, // create session until something stored
    expires: date.toUTCString(),
    cookie: {
        secure: false,
        httpOnly : true,
        maxAge : 30 * 24 * 60 * 60 * 1000 //30days
    }
});

我的isAuthenticated()总是返回false！

请告诉我它可能是什么？