"sync" (model_or_collection, response, options) â when a model or collection has been successfully synced with the server.

listenToOnceobject.listenToOnce(other, event, callback) Just like

"change" (model, options) â when a model's attributes have changed.

"remove" (model, collection, options) â when a model is removed from a collection.

"route" (route, params) â Fired by the router when any route has been matched.

"update" (collection, options) â single event triggered after any number of models have been added or removed from a collection.

"add" (model, collection, options) â when a model is added to a collection.

"error" (model_or_collection, response, options) â when a model's or collection's request to the server has failed.

"destroy" (model, collection, options) â when a model is destroyed.

"sort" (collection, options) â when the collection has been re-sorted.