public/build/static/application.js
function(model, options) {
            model = this._prepareModel(model, options);
            this.add(model, options);
            return model;
        }
function(model, options) {
            model = this._prepareModel(model, options);
            this.add(model, options);
            return model;
        }
function ( model , options ) { model = this . _prepareModel ( model , options ) ; this . add ( model , options ) ; return model ; }
Add a model at the end of the collection.

@method push
@param {Model} model model or data to add
@param {object} [options] options for adding
@return {Model} Return the new added model
Add a model at the end of the collection .