Deferreds  page     

Models (and also views) work with jQuery.Deferred. If you properly fill out a model's service API, asynchronous requests done via the model will return a jQuery.Deferred.

findAll example

The following example, requests tasks and people and waits for both requests to be complete before alerting the user:

var tasksDef = Task.findAll(),
    peopleDef = People.findAll();

$.when(tasksDef,peopleDef).done(function(taskResponse, peopleResponse){
  alert("There are "+taskRespone[0].length+" tasks and "+
        peopleResponse[0].length+" people.");
});

Note taskResponse[0] is an Array of tasks.

save and destroy example

Calls to save and jQuery.Model.destroy also return a deferred. The deferred is resolved to the newly created, destroyed, or updated model instance.

The following creates a task, updates it, and destroys it:

var taskD = new Task({name: "dishes"}).save();

taskD.done(function(task){

  var taskD2 = task.update({name: "all the dishes"})

  taskD2.done(function(task){

     var taskD3 = task.destroy();

     taskD3.done(function(){
       console.log("task destroyed");
     })

  })

});