How to perform sorting in mongoose (from http://stackoverflow.com/a/15081087)

mongoose-sorting.js

Room.find({}).sort('-date').exec(function(err, docs) { ... });
Room.find({}).sort({date: -1}).exec(function(err, docs) { ... });
Room.find({}).sort({date: 'desc'}).exec(function(err, docs) { ... });
Room.find({}).sort({date: 'descending'}).exec(function(err, docs) { ... });
Room.find({}, null, {sort: {date: -1}}, function(err, docs) { ... });
Room.find({}, null, {sort: [['date', -1]]}, function(err, docs) { ... });