Post type tree loop

Hi NelutuO.

Do you have any code to show?

I’m a beginner so what I have is very basic and may not help to much.
I have a basic loop and two variables that I thought may hold the key.

<?php $loop= new WP_Query( array( 'post_type'=> 'post-type', 'posts_per_page' => -1 ) ); ?>
<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
    <?php echo $id = get_the_ID(); ?>
     -
    <?php echo $parent = $post->post_parent; ?>

    <?php the_title(); echo "<br />"; ?>

<?php endwhile; wp_reset_query(); ?>

What I was trying to do but didn’t managed is this:

display the pages that have the parent equal to zero
check if the page is a parent
if it is -> loop and display the child pages

I don’t know if WP_Query can display the pages that have a specific parent (wich we know since we have its id) and I don’t know if a WP_Query can be used inside another WP_Query

Use this:

$loop = new WP_Query( array( 'post_type' => 'your_post_type', 'post_parent' => 0 , 'posts_per_page' => -1 ) );
while ( $loop->have_posts() ) : $loop->the_post();
    //parent page title
    the_title();
    $parent_page_id = $post->ID;
    $child_pages = get_pages( array( 'child_of' => $parent_page_id , 'post_type' => 'your_post_type', 'posts_per_page' => -1 ) );
    if ( $child_pages != false ) {
        foreach( $child_pages as $page ) {
             //child page title
            echo  $page->post_title;
        }
     }
endwhile;