Model.create({ success: function(){...}})とか書きたくないので関数追加した．もっと綺麗にできればいいんだけど無理そう．

backbone-collection-create-deferred.js

// Return Backbone.sync's retval instead of the saved model
// to use the deferred object ($.ajax: jsdeferred.jquery.js).
Backbone.Collection.prototype.createDeferred = function(model, options) {
    var coll = this;
    options || (options = {});
    model = this._prepareModel(model, options);
    if (!model) return false;
    return model.save(null, options);
};

// var collection = Backbone.Collection.extend();
// collection.createDeferred(this.newAttributes())
//     .next(function(response) {
//         var models = _(response).map(function(row) {
//             return new SomeModel(row);
//         });
//         // do something...
//     }).error(function(e) {
//         console.error(e);
//     });