/**
* Return the default sort rule for the query
*
* @param string $column An optional column
*
* @return array An array of two values: $column, $direction
*/
protected function getSortDefaults($column = null)
{
$direction = null;
if ($this->query !== null && $this->query instanceof SortRules) {
$sortRules = $this->query->getSortRules();
if ($column === null) {
$column = key($sortRules);
}
if ($column !== null && isset($sortRules[$column]['order'])) {
$direction = strtoupper($sortRules[$column]['order']) === Sortable::SORT_DESC ? 'desc' : 'asc';
}
}
return array($column, $direction);
}
