promise.js

                                p.then(function() { 
                                        var deferred = Q.defer(); 
                                        org.updateInfo(doc._id, {}, deferred.makeNodeResolver()); 
                                        
                                        return deferred.promise;  
                                      }).then(function(doc) { 
                                           res.json(doc); 
                                      }).fail(function(err) { 
                                        msg.result = false; 
                                        msg.code = 500; 
                                        msg.message = err.message; 
                                        res.status(500).json(msg); 
                                });