attachments_per_post.php

gistfile1.txt

<?php

function devplus_attachments_wpquery_where( $where ){
    if( is_user_logged_in() ){
        // we spreken over een ingelogde user
        if( isset( $_POST['action'] ) ){
            // library query
            if( $_POST['action'] == 'query-attachments' ){
                $where .= ' AND post_parent != 0';
            }
        }
    }
    return $where;
}
add_filter( 'posts_where', 'attachments_per_post' );