Taxonomy template file not working with a taxonomy that contains a slash

Question

I'm trying to get a taxonomy archive template file to work, but with no luck. I think it might have to do with the fact that I declared a slug for the taxonomy like custom_post_type/taxonomy in order to keep the custom post type showing.

Here's how I register the custom post type and the custom taxonomy:

$args = array(
    'labels' => $labels,
    'query_var' => __('color', 'mydomain'),
    'rewrite' => array(
        'slug' => __('houses/color', 'mydomain'),
        'with_front' => true 
    )
);

register_taxonomy('color', null, $args);

$args = array(
    'labels' => $labels,
    'public' => true,
    'capability_type' => 'post',
    'supports' => array('title', 'thumbnail', 'custom-fields'),
    'has_archive' => true,
    'taxonomies' => ['color'],
    'rewrite' => array(
        'slug' => __('houses', 'mydomain'),
        'with_front' => true
    )
);

register_post_type('house', $args);

My template file is called taxonomy-color.php and I expect it to be used when the pages /houses/color/red and /houses/color/green are visited.

Note: my actual custom post type name contains a dash, I don't know if it matters.

Answer 1

You need to register the Custom Taxonomy BEFORE the Custom Post Type that it belongs to in order for the rewrite rule to work. The taxonomy needs to “exist” before the post type in order for WordPress to build the URL correctly.