wordpress - Custom permalink structure: /%custom-post-type%/%custom-taxonomy%/%post-name%/

Question

I'm trying to create a custom permalink structure that will allow me to accomplish the following.

1. I have a custom post type called "projects"
2. I have a custom taxonomy called "project-category" that is assigned to the CPT "projects"

I want my permalink structure to look like this:

projects/category/project-name

or

/%custom-post-type%/%custom-taxonomy%/%post-name%/

I've been able to succesfully use /%category%/ in permalinks for normal, out-of-the-box WP posts, but not for CPTs.

How would creating such a permalink structure affect the URLs or other pages? Is it possible de define a custom permalink structure and restrict it to a single CPT?

Thanks

Answer 1

Lucky for you, I just had to do this for a client project. I used this answer on the WordPress Stackexchange as a guide:

/**
 * Tell WordPress how to interpret our project URL structure
 *
 * @param array $rules Existing rewrite rules
 * @return array
 */
function so23698827_add_rewrite_rules( $rules ) {
  $new = array();
  $new['projects/([^/]+)/(.+)/?$'] = 'index.php?cpt_project=$matches[2]';
  $new['projects/(.+)/?$'] = 'index.php?cpt_project_category=$matches[1]';

  return array_merge( $new, $rules ); // Ensure our rules come first
}
add_filter( 'rewrite_rules_array', 'so23698827_add_rewrite_rules' );

/**
 * Handle the '%project_category%' URL placeholder
 *
 * @param str $link The link to the post
 * @param WP_Post object $post The post object
 * @return str
 */
function so23698827_filter_post_type_link( $link, $post ) {
  if ( $post->post_type == 'cpt_project' ) {
    if ( $cats = get_the_terms( $post->ID, 'cpt_project_category' ) ) {
      $link = str_replace( '%project_category%', current( $cats )->slug, $link );
    }
  }
  return $link;
}
add_filter( 'post_type_link', 'so23698827_filter_post_type_link', 10, 2 );

When registering the custom post type and taxonomy, be sure to use the following settings:

// Used for registering cpt_project custom post type
$post_type_args = array(
  'rewrite' => array(
    'slug' => 'projects/%project_category%',
    'with_front' => true
  )
);

// Some of the args being passed to register_taxonomy() for 'cpt_project_category'
$taxonomy_args = array(
  'rewrite' => array(
    'slug' => 'projects',
    'with_front' => true
  )
);

Of course, be sure to flush rewrite rules when you're done. Good luck!