I'm using this code to populate the dropdown menu in a meta box.
$parents = get_posts( array( 'post_type' => 'jhk_story', 'orderby' => 'ID', 'order' => 'ASC', 'numberposts' => -1, 'exclude' => array(121, 131, 138), ) );
This post_type contains the parents of a post_type 'jhk_frames', which are the only child. So, the children contain in their post_parent field the post_ID of their parent. The parent contains in their post_parent field still the default zero.
My question is: how do I select only the posts in the post_type 'jhk_story' that have a child?
Next step is to put the id's of these posts in the 'exclude' array. The values you see right now are put there by me, just for example (and a check that is works).
Any help will be appreciated greatly.