class.ilDclFormulaFieldModel.php

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<?php
require_once("./Modules/DataCollection/classes/Fields/Formula/class.ilDclFormulaRecordQueryObject.php");
require_once("./Modules/DataCollection/classes/Helpers/class.ilDclRecordQueryObject.php");

class ilDclFormulaFieldModel extends ilDclBaseFieldModel {

        public function getRecordQuerySortObject($direction = "asc", $sort_by_status = false) {
                // use custom record query object for adding custom sorting
                $sql_obj = new ilDclFormulaRecordQueryObject();
                return $sql_obj;
        }

        public function getValidFieldProperties() {
                return array(ilDclBaseFieldModel::PROP_FORMULA_EXPRESSION);
        }

        public function allowFilterInListView() {
                return false;
        }
}