class.ilDclTextRecordQueryObject.php

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<?php

class ilDclTextRecordQueryObject extends ilDclRecordQueryObject {

        public function applyCustomSorting(ilDclBaseFieldModel $field, array $all_records_ids, $direction = 'asc') {
                $sort_array = array();
                foreach ($all_records_ids as $id) {
                        $url_field = ilDclCache::getRecordFieldCache(new ilDclBaseRecordModel($id), $field);
                        $sort_array[$id] = $url_field->getSortingValue();
                }
                switch (strtolower($direction)) {
                        case 'asc':
                                asort($sort_array);
                                break;
                        case 'desc':
                                arsort($sort_array);
                                break;
                }
                return array_keys($sort_array);
        }
}