archive.php | Wordpress theme file part | Show just one category (parent category alone, or child categories alone)

gistfile1.aw

<?php $cat_obj = $wp_query->get_queried_object(); ?>

<?php 
if( $cat_obj->parent ) { 
	// CATEGORIA FILL / Child category only
	while ( have_posts() ) : the_post(); ?>

		<?php include('post.php'); ?>

<?php endwhile; ?>
				
<?php } else { ?>
	
<?php 
	// CATEGORIA PARE / Parent category only
	while ( have_posts() ) : the_post(); ?>
	<?php 

	        // Controlem que sempre sigui una categoria pare / a parent has no parent
		$category = get_the_category();			
		if ($category[0]->category_parent == 0) :	?>

			<?php include('post.php'); ?>

		<?php endif; ?>

<?php endwhile; ?>
	
<?php } ?>