Get information from the req.contents including from an Array

How to get info from the req you added to.

//Pull out the item with that id add it to the req.contents hash then go to next function...

var mariaItem = function (req, res, next) {
        Item.findOne({ _id: "5099803df3f4948bd2f98391"}, function (err, result){
            //res.json(result);
            //var firstOne = res.json(result);
            //{ field: { $in: [<value1>, <value2>, ... <valueN> ] } } 
            //Group.find({_id: {$in: req.contents.item.groups}}, function (err, groups) {
             req.contents = {};
             req.contents.result = result;
            next();
        });
    };
//Out of te Users, find the one whose id matches the sellerId that is in the req hash (req.contents.result.seller.sellerId)
//And add that result to the req hash and then go to the next function...

var mariaS = function (req, res, next) {
        User.findOne({_id: req.contents.result.seller.sellerId}, function (err, result){
            req.contents.seller = result;
            next();
            //res.json(req.contents);
        });
    };
//Out of the Group find the group id the matches from the array groups that is in the req.contents etc hash add it 
//And show everything that is in the req.contents now (in json)

var mariaG = function (req, res, next) {
        Group.find({_id: {$in: req.contents.result.groups}}, function (err, result){
            req.contents.groups = result;
            res.json(req.contents);
        }); 
    }; 

app.get('/maria/item',
        mariaItem,
        //mariaTwo,
        mariaS,
        mariaG
        // mariaShowIt
        );