private function appendPreviousAttachements(DOMElement $field_node, $artifact_id, $submitted_on, $old_value)
{
$previous_attachements = array_filter(explode(',', $old_value));
foreach ($previous_attachements as $attachement) {
$dar = $this->dao->searchFileBefore($artifact_id, $attachement, $submitted_on);
if ($dar && $dar->rowCount() == 1) {
$row_file = $dar->current();
$field_node->appendChild($this->getNodeValueForFile($row_file['id']));
}
}
}
