gistfile1.js

/** Context: We are going to create a sharebox system (an User has files & folder objects and can share it to his Team **/

// We have 4 models: File.js, User.js , Folder.js and Team.js
// 1) We first get the Team and we load the users in it
// 2) For each user, we need to add the association (User -> File and User->Folder)

// Loading the Team object
Team
    .findOne(1)
    .populate('users')
    .exec(function exec(error, team) {
        if (error) {
            return sails.services['errorservice'].sendError(404, error, req, res);
        }

        res.json(200);

        var files = [1,2,9,22,23]; // Array containing some file ids as example
        var folders = [1,2,32,21]; // Array containing some folder ids as example
        
        var processUser = function processUser(user, callback) {
            // In parallel, we need to add each file & folder (from the arrays declared above)
            async.parallel(
                [
                    /** Add file association to each user **/
                    function fileJob(next) {
                        async.each(
                            files,
                            function addAssociationFor(file, done) {
                                user.files.add(file);
                                user.save(done);
                            },
                            next
                        );
                    },

                    /** Add folder association to each user **/
                    function folderJob(next) {
                        async.each(
                            folders,
                            function addAssociationFor(folder, done) {
                                user.folders.add(folder);
                                user.save(done);
                            },
                            next
                        );
                    }
                ],
                callback
            );
        };
        
        var processUsers = function processUsers(result, callback) {
            sails.models['user']
                .findOne({id: result.id})
                .populate('files')
                .populate('folders')
                .exec(function(error, user) {
                    if (error) {
                        callback(error);
                    } else {
                        processUser(user, callback);
                    }
                });
        };

        async.each(
            team.users, // Foreach user in this Team
            processUsers,
            function allDone(error) {
                if (error) {
                    return ErrorService.sendError(404, error, req, res);
                } else {
                    return sails.log('Everything has been done here');
                }
            }
        );
    });