Both parent and child articles in archive page

Question

I used custom post types UI to create a custom post type (kennisbank)

Now within this custom post type I have both parent articles and child articles, as I made this custom post type hierarchical. I like to only display the parent articles on the archive page.

Can anyone explain me how to do this?

Answer 1

I hadn't tried this in practice, but theoretically should be easy.

1. post_parent argument in query set to 0 should limit it to parent items, see Post & Page Parameters.

2. Use pre_get_posts hook to correctly adjust main query, adding that argument.