Custom post type archive category page results in 404

Question

I've created a custom post type:

register_post_type('campaign',
   array(
      'labels' => array(
         'name' => __("Campaigns"),
         'singular_name' => __("Campaign"),
      ),
      'rewrite' => array(
         'slug' => 'campaigns',
         'with_front' => FALSE,
      ),
      'public' => TRUE,
      'has_archive' => TRUE,
      'supports' => array('title', 'editor', 'thumbnail'),
      'publicly_queryable' => TRUE,
   )
);

And a custom taxonomy for categories:

register_taxonomy( 'campaign_category', 'campaign', 
   array( 
      'hierarchical' => TRUE, 
      'label' => 'Categories', 
      'query_var' => TRUE, 
      'rewrite' => array(
          'slug' => 'category',
          'with_front' => FALSE,
          'hierarchical' => FALSE,
      ),
   ) 
);

Because the post type was created with has_achive set to TRUE I can browse to the /campaigns URL and my archive-campaign.php template is triggered. So far so good.

However, when I try to access a category, /campaigns/category/fashion, I get a 404.

The category with the correct slug exists and I've re-saved my permalinks each time I've made a chance to any of the rewriting rules.

Any suggestions would be much appreciated.

Answer 1

Two things:

1. You shouldn't be using 'category' as a slug, since it's already built into WP and thus is reserved (http://codex.wordpress.org/Function_Reference/register_taxonomy#Reserved_Terms)

2. Pretending for a moment that it isn't reserved, the base URL structure wouldn't contain the post type in front of it.

EDIT

1. I just realized you didn't set the archive slug itself. Instead of has_archive = true, set it to has_archive = 'campaigns' (to match your other slug). That should set your permalinks to match.

Answer 2

You have to se up your taxonomy slug as "%campaign_category%" and replace it in a function later.

Here I explain how I did it (I applied it to the category itself because I wanted to also delete the category slug from the url, but will understand)

Removed slug from CPT, now How/where do I hook the filter to the taxonomy term archive pages link?

Let me know if your different case breaks the other links too. This solutions worked for others but I think it breaks in my site because some other reasons, e.g. multisite installation.