Adding an "update" event to Backbone.Collection instances when a model is saved

backbone_sync_update.js

Backbone.Model.prototype.save = (function(original) {
  return function(attrs, options) {
    var me = this;
    options = options || {};
    var origSuccess = options.success;
    var wasNew = this.isNew();
    options.success = function(model, response) {
      if (me.collection && !wasNew) { me.collection.trigger("update", me); }
      if (origSuccess) { origSuccess(model, response); }
    };
    original.call(this, attrs, options);
  };
})(Backbone.Model.prototype.save);