Cannot execute query update with multiple rows

I'm trying to update multiple rows using this code:

PHP Code:

$directoryId = $this->request->getPostGet('directory_id');
        $where = $this->request->getPostGet('media_ids');
        var_dump($where);
        var_dump($directoryId);
        $result = $this->post->whereIn('id', $where)->update('parent', $directoryId); 


essentially $where contains this:

PHP Code:

array(2) {
  [0]=>
  string(4) "1115"
  [1]=>
  string(4) "1116"
} 


and $directoryId is: 1132

I get:

PHP Code:

Return value must be of type array, string returned 


"oh baby please give a little respect to ..." framework

RTFM

PHP Code:

$userModel
    ->whereIn('id', [1,2,3])
    ->set(['active' => 1])
    ->update();