app
        .filter('objects2string', function () {
            return function (input, param, delimiter, empty) {
                if (angular.isUndefined(input)) {
                    return input;
                }
                param = param || 'name';
                delimiter = delimiter || ', ';
                empty = empty || '~';
                if (input === null) {
                    return '';
                }

                return input.map(function (item) {
                    return item[param] || empty;
                }).join(delimiter);
            };
        });