wp query - How to display grandchildren only of custom post?

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I am trying to display the grandchildren of a custom post type.

The structure is is fairly simple:

Issues
   Issue 1
      Article 1
      Article 2
      Article 3 etc
   Issue 2
      Article 1
      Article 2
      Article 3 etc
   Issue 3 etc etc

Is there a way to display the Articles(grandchildren) in a single WP query specifying the ParentID?

    //displays all posts :(
    $args = array('post_type' => 'magazine',
        'child_of' => array(20321), //Issues (parent postID)
    );

I am trying to display the grandchildren of a custom post type.

The structure is is fairly simple:

Issues
   Issue 1
      Article 1
      Article 2
      Article 3 etc
   Issue 2
      Article 1
      Article 2
      Article 3 etc
   Issue 3 etc etc

Is there a way to display the Articles(grandchildren) in a single WP query specifying the ParentID?

    //displays all posts :(
    $args = array('post_type' => 'magazine',
        'child_of' => array(20321), //Issues (parent postID)
    );

• custom-post-types
• wp-query

Share Improve this question asked Apr 16, 2019 at 14:47 ianhmanianhman 1355 bronze badges 3

• Check this out: wordpress.stackexchange/questions/81645/… – Siddhesh Shirodkar Commented Apr 16, 2019 at 15:11
• @SiddheshShirodkar that displays children and grandchildren. I only want to display the grandchildren. – ianhman Commented Apr 16, 2019 at 15:16
• All you would have to do to make that grandchildren only is return $children before merging $children with $posts – mrben522 Commented Apr 16, 2019 at 16:14

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1 Answer 1

Sorted by: Reset to default 0

Solved my own question after further research and testing :) Ended up using 2 queries passing the result from one query to the other. Hope this helps someone.

    $argsIssues = array( 'post_type' => 'magazine',
        'post_parent__in' => array(20321), //get issue(children) posts from the issues(parent)
        'fields' => 'ids' //query only the postIDs
    );
    $q = get_posts( $argsIssues ); //run $argsIssues query

    $argsArticles = array( 'post_type' => 'magazine',
        'post_parent__in' => $q //get article(grandchildren) posts from issue(children) posts.
    );

    query_posts( $argsArticles ); //run $argsArticles query

    //while loop goes here to display posts from $argsArticles query

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