/src/Oro/Bundle/AddressBundle/Resources/public/js/address/collection.js

/*global define*/
define(['underscore', 'backbone', 'oroaddress/js/address/model'
    ], function (_, Backbone, AddressModel) {
    'use strict';

    /**
     * @export  oroaddress/js/address/collection
     * @class   oroaddress.address.Collection
     * @extends Backbone.Collection
     */
    return Backbone.Collection.extend({
        model: AddressModel,

        initialize: function () {
            this.on('change:active', this.onActiveChange, this);
        },

        onActiveChange: function (item) {
            // Only 1 item allowed to be active
            if (item.get('active')) {
                var activeItems = this.where({active: true});
                _.each(activeItems, function (activeItem) {
                    if (activeItem.get('id') !== item.get('id')) {
                        activeItem.set('active', false);
                    }
                });
                this.trigger('activeChange', item);
            }
        }
    });
});