toggle models in collection

var Engines = Backbone.Collection.extend({
    model: FilterItem,
    initialize: function() {
        this.on('change:selected', this.toggleSelected, this);
    },
    toggleSelected: function(model) {
        if (model.changed.selected) {
            this.without(model).forEach(function(unSelectedModel) {
                unSelectedModel.set('selected', false);
            });
        }
    }
});