Backbone collection 0.9.9 - add event not work - backbone.js

Question

Backbone collection 0.9.9 - add event not work
After update backbone to 0.9.9, i have a problem with (add).
(function () {
var Model = Backbone.Model.extend({
initialize: function () {
console.log('initialize Model');
}
});
var Collection = Backbone.Collection.extend({
model: Model,
url: "/json.json",
initialize: function () {
console.log('initialize Collection');
}
});
var View = Backbone.View.extend({
initialize: function () {
console.log('initialize View');
}
});
var collection = new Collection([
{
"id" : "001",
"name" : "Дарья",
"text" : "1 Вопрос - Ответ 1"
}
]);
collection.on('add', function () {
console.log('edd event', this)
});
collection.fetch({
add: true,
//silent: false,
success: function (model) {
console.log('fetch')
}
});
}());
console.log('edd event', this) - not work (
in old versions it works

Answer 1

It would appear that the add option to collection.fetch is no longer supported.
From 0.9.2 source (collection.fetch):
collection[options.add ? 'add' : 'reset'](collection.parse(resp, xhr), options);
From 0.9.9 source (collection.fetch):
var method = options.update ? 'update' : 'reset';
collection[method](resp, options);
if (success) success(collection, resp, options);
So by default collection.fetch will cause a reset on the collection, and the resetevent will be fired. If you pass option update:true, and update will be performed.
According to documentation for the new collection.update method, update will trigger the add events for added models, so the following should work:
collection.fetch({
update: true,
success: function (model) {
console.log('fetch')
}
});
Just test and be aware, that the new update method will also trigger remove and changeevents, if models are removed or changed.

Answer 2

You need to remove the commented out line because it won't propagate the add events otherwise (see line 827 of the backbone.js source). So the following should work
collection.fetch({
add: true,
silent: false,
success: function (model) {
console.log('fetch')
}
});
I'm not sure if that's a change from previous versions :)

Answer 3

From what I gather from checking out the Backbone 0.9.9 source, the add -option does nothing with fetch unless you add in the update - option as well. source
So to do something useful with it do the following:
collection.fetch({
add: true,
update: true, // this is necessary as well
//silent: false,
success: function (model) {
console.log('fetch')
}
});
This is also the cause for your problem. When you fetch, the Collection automatically defaults to the reset -function after fetching. reset silences the add -events and opts to just trigger a reset event as is evident from the Backbone.js source
if (models) this.add(models, _.extend({silent: true}, options));
So use the update option if you want the add -events and do not want to empty the collection before adding the new models. If you must have the reset functionality AND the add event, then you might have to write some custom implementation of reset.