/**
* Handle a bulk toggle
*
* @param \Cake\ORM\Query|null $query The query to act upon
* @return bool
*/
protected function _bulk(Query $query = null)
{
$field = $this->config('field');
$expression = [new QueryExpression(sprintf('%1$s= NOT %1$s', $field))];
$query->update()->set($expression);
$statement = $query->execute();
$statement->closeCursor();
return $statement->rowCount();
}