Profile: petranL

Problem: I have a View that shows Pages (a hierarchical post type). I would like to show a random Page, filtered by a post ancestor. Any descendant Pages of that ancestor should be shown by the View.

Solution: Use a custom shortcode to generate a comma-separated list of all the descendant post IDs:

function get_all_descendent_pages($atts) {
  global $post;
  $all_wp_pages = get_pages();
  $descendent_pages = get_page_children( $post->ID, $all_wp_pages );
  $ids = array();
  foreach( $descendent_pages as $dp ) {
    array_push( $ids, $dp->ID );
  }
  return implode(',', $ids);
}
add_shortcode("get-all-descendent-pages", "get_all_descendent_pages");

Place this shortcode on your ancestor Page:

[get-all-descendent-pages] //results: 123,456,789

Add this shortcode in Toolset > Settings > Front-end Content > Third-party shortcode arguments.

Use the custom shortcode to supply the value of a post IDs shortcode attribute for your View:

[wpv-view name="anderen-lezen-ook-nz" ids="[get-all-descendent-pages]"]

Change the View's Query Filter to filter by post ID, set by a shortcode attribute "ids".