Show custom posts by category - but sort by subcategory WordPress

Ivaylo Draganov answers:

Hello,

I think I've cracked that. It's possible to query by custom taxonomies - it's just has not been documented yet. OK, I hope I've understood the question right. Here we go.

I've used the default TwentyTen theme with a custom taxonomy called "Catalog" and post type called "Products".

1) Put this in functions.php

// register custom post types and taxonomies
function register_custom_post_types() {

// register custom post type
$labels = array(
'name' => 'Products',
'singular_name' => 'Product'
);

$args = array(
'labels' => $labels,
'public' => true,
'capability_type' => 'post',
);

register_post_type('products', $args);

// register taxonomy
$labels = array(
'name' => 'Catalogs',
'singular_name' => 'Catalog',
);

register_taxonomy('catalog', array('products'), array(
'hierarchical' => true,
'labels' => $labels,
'public' => true
)
);

}
add_action('init', 'register_custom_post_types');


2) Put this in your taxonomy-catalog.php

<?php
// taxonomy-catalog.php

// set variables
$term = get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) );
$tax = get_query_var( 'taxonomy' );

get_header(); ?>

<div id="container">
<div id="content" role="main">

<h1 class="page-title"><?php echo $term->name; ?></h1>
<?php

// if term has children
if (get_term_children($term->term_id, $tax) != null) {

// get child terms
$term_children = get_terms(
$tax,
array(
'child_of' => $term->term_id,
)
);

// loop through them
foreach ($term_children as $term_child) {

// print title
echo '<h2>' . $term_child->name . '</h2>';

// change query
query_posts(array(
'catalog' => $term_child->slug,
)
);

// loop through posts
if (have_posts()) : ?>

<ul>

<?php while (have_posts()) : the_post(); ?>

<li <?php post_class(); ?>>

<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>

</li>

<?php endwhile; ?>

</ul>

<?php endif;

}

// if term has no chilren
} else {

// loop through posts
if (have_posts()) : ?>

<ul>

<?php while (have_posts()) : the_post(); ?>

<li <?php post_class(); ?>>

<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>

</li>

<?php endwhile; ?>

</ul>

<?php endif;

}

?>

</div><!-- #content -->
</div><!-- #container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>


3) Enjoy

Please check out the result on my test site:
http://test.druuf.com/wordpress/?catalogs=pants (parent category)
http://test.druuf.com/wordpress/?catalogs=baggy-style (child category)

Achim Baur comments:

Awesome, you've really cracked it. Thanks a bunch!