/**
* Sets up a multiple columns to search by. Each argument is taken "as-is" (including asc or desc) and concatenated with commas
* Note that this is overrides any previous sortByMultiple() call, and all sortBy() calls. Alternatively, you can pass a single
* array with multiple columns to sort by as its values.
* e.g. $list->sortByMultiple('columna desc', 'columnb asc');
* or $list->sortByMultiple(array('columna desc', 'columnb asc'));
*/
public function sortByMultiple()
{
return parent::sortByMultiple();
}
