class.ilDclFormulaRecordQueryObject.php

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<?php

class ilDclFormulaRecordQueryObject extends ilDclRecordQueryObject
{
    public function applyCustomSorting(
        ilDclBaseFieldModel $field,
        array $all_records,
        string $direction = 'asc'
    ): array {
        $sort_array = array();
        foreach ($all_records as $id) {
            $formula_field = ilDclCache::getRecordFieldCache(new ilDclBaseRecordModel($id), $field);
            $sort_array[$id] = $formula_field->getValue();
        }
        switch (strtolower($direction)) {
            case 'asc':
                asort($sort_array);
                break;
            case 'desc':
                arsort($sort_array);
                break;
        }

        return array_keys($sort_array);
    }
}