risolvere una promessa usando mongodb e nodejs

Dovrebbe funzionare quanto segue:

var getShows = function () {

    return new Promise(function (resolve, reject) {

        usersdb.find(function (err, users) {
            if (err) return console.error(err);

            var task = function (user) {
                return new Promise(/* ... */);
            };

            var actions = users.map(task);
            Promise.all(actions).then(resolve, reject);
        });

    });

};

getShows().then(function (results) {
    // Prints the result of each task as an array
    console.log(results);
});