selector syntax has_parent for page reference field

[sujag]

I'm having trouble by finding the right syntax for accessing ancestors of a page Reference field in a selector. I need to find all pages with a given template that include a page reference to  some descendants of a given page.

Working query is

  $regionEvents = $pages->find("template=veranstaltung,selectLocation.parent=$page,eventTime>$curYearStart")->sort('selectLocation');

but after changing site structure I need to find not only references to direct children, but also to grandchildren.

I tried "selectLocation.has_parent=$page" but this throws an error "Unknown subfield: has_parent"

Is this simply a syntax problem or do I need another way to find the pages I need?

 

[ottogal]

Perhaps this old thread can be helpful?

 

[sujag]

Thanks, this gave me indeed the necessary hint.

a two step query seems to do, what I'm after

$regionLocations = $pages->find("has_parent=$page");
$regionEvents = $pages->find("template=veranstaltung,selectLocation=$regionLocations,eventTime>$curYearStart")->sort('selectLocation');