example.js

Post.find({})
    .sort('-date')
    .exec(function(err, docs){
        console.log(req.session);
        Category.$where('this.name.length > 0;')
            .exec(function(err, cats){
                Page.find({nav: "true"}, function(err,pages){
                res.render('index', {title: 'Clay Whitley | Blog', docs: docs, cats: cats, pages: pages, loggedin: req.session.loggedIn});
            });
        }); 
    });