Using Async waterfall

Changed the code from the previous gists to an async waterfall

// SO here I have gone from having to call three different functions to only calling one (mariaView)
// I took //mariaItem,
        //mariaTwo,
        //mariaS,
        //mariaG
// and wrapped them in one function mariaView that then uses async waterfall. 
// This will NOT work with async parallel because parallel does all the functions at the same time, and the 
// second, third and fourth functions need the info from the first function to succeed.  

var mariaView = function (req, res, next){
    async.waterfall([
        function(callback){
            Item.findOne({ _id: "5099803df3f4948bd2f98391"}, function (err, result){
                req.contents = {};
                req.contents.result = result;
                callback();
            });
        },

        function(callback){
            User.findOne({ _id: req.contents.result.seller.sellerId}, function (err, result) {
                req.contents.seller = result;
                callback();
            });
        },
        function(callback){
            Group.find({ _id: {$in: req.contents.result.groups}}, function (err, result){
                req.contents.groups = result; 
                callback();   
            }); 
        }], function(err, something){
             res.json(req.contents);
     }); 
};  

app.get('/maria/item',
        mariaView
        );