or_where query

Hi,
Having great fun with new release of CI4!
Great job guys!

I'm trying to run a query that fetches 1 row where either of fields (name or name1) equals "$name".

PHP Code:

return $this->asArray()
                    ->select('id')
                    ->where('name', $name)
                    ->or_where('name1', $name)
                    ->first(); 


Can somebody explain why I get the following error?
Call to a member function first() on null

How can I use or_where?

Thanks!

found the answer here (p. 320) using Query builder :
https://www.procoversfx.com/download/cod...beta.1.pdf
$db = $this->builder();
$query = $db->select('id, nom')
->where('name', $name)
->orWhere('name1', $name)
->get();
return count($query->getResult());