protected function getFilterValues($filter)
{
if (isset($filter['search']) && $filter['search']) {
$search = $filter['search'];
} else {
$search = null;
}
if (isset($filter['column']) && $filter['column']) {
$column = $filter['column'];
} else {
$column = null;
}
if (isset($filter['stageId']) && $filter['stageId']) {
$stageId = $filter['stageId'];
} else {
$stageId = null;
}
return array($search, $column, $stageId);
}