WordPress Custom Type permalink containing Taxonomy slug

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I’m trying to create a permalink pattern for a Custom Type, that includes one of its taxonomies. The taxonomy name is known from the start (so I’m not trying to add or mix all of its taxonomies, just a specific one), but the value will by dynamic, of course.

Normally, the Custom Type permalink is built using the rewrite arg with the slug param, but I don’t see how I could add a dynamic variable in there.

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http://codex.wordpress.org/Function_Reference/register_post_type

I’m guessing a custom solution is required, but I’m not sure what the best unintrusive approach would be.

Is there a known practice for this or has anyone built something similar recently? I’m using WP 3.2.1 btw.

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  1. After more searching I managed to create fairly elegant solution using the custom_post_link filter.

    Let’s say you have a project Custom Type with a client Taxonomy. Add this hook:

    function custom_post_link($post_link, $id = 0)
{
  $post = get_post($id);

  if(!is_object($post) || $post->post_type != 'project')
  {
    return $post_link;
  }
  $client = 'misc';

  if($terms = wp_get_object_terms($post->ID, 'client'))
  {
    $client = $terms[0]->slug;

    //Replace the query var surrounded by % with the slug of 
    //the first taxonomy it belongs to.
    return str_replace('%client%', $client, $post_link);
  }

  //If all else fails, just return the $post_link.
  return $post_link;
}

add_filter('post_type_link', 'custom_post_link', 1, 3);

    Then, when registering the Custom Type, set the rewrite arg like this:

    'rewrite' => array('slug' => '%client%')

    I guess I should have dug deeper before asking, but at least we have a complete solution now.