Relationship slugs witha custom post type

• d-artagnan

• June 19, 2014 at 10:32 pm

I created a custom post type ‘collection’ and a custom post type ‘item’.
I used the ACF relationship so when I add an item, I can select under which collection it should be.

add_action( 'init', 'kc_create_post_type_collection' );
function kc_create_post_type_collection() {
	register_post_type( 'kc_collection',
		array(
			'labels' => array(
				'name' => __( 'Collection' ),
				'singular_name' => __( 'Collection' )
			),
			'capability_type' => 'post',
			'public' => true,
			'has_archive' => true,
			'rewrite' => array('slug' => '/collection'),
			'supports' => array( 'title'),
			'menu_position' => 21,
			'menu_icon' => 'dashicons-tag'
		)
	);
}

add_action( 'init', 'kc_create_post_type_items' );
function kc_create_post_type_items() {
	register_post_type( 'kc_item',
		array(
			'labels' => array(
				'name' => __( 'Items' ),
				'singular_name' => __( 'Item' )
			),
			'capability_type' => 'post',
			'public' => true,
			'has_archive' => true,
			//'rewrite' => array('slug' => '/collection'), ??????
			'supports' => array( 'title'),
			'menu_position' => 21,
			'menu_icon' => 'dashicons-tag'
		)
	);
}

The slug of collection is like http://www.site.com/collection/collection-name
The slug of an item should be something like
http://www.site.com/collection/collection-name/item-name

But how can I create such a slug? Keep in mind that an item can be under more then one collection.

Any ideas? Thanks!

• Twansparant

• August 22, 2016 at 6:52 pm

Did you ever figure this out? I want to achieve exactly the same!

Right now, I have the following setup (I used item & collection to match your example);
In my post type I have the following rewrite set:

'rewrite' => array('slug' => 'item/%collection%'),

And a function that replaces %collection% for the acf value:

function setupItemPermalink($post_link, $id = 0) {
	$post = get_post($id);
	if (is_object($post) && get_post_type($post) == 'item') {
		$collection = get_field('item_collection', $post->ID);
		if ($collection) {
			$collection = get_post($collection[0]); // get first in array
			return str_replace('%collection%' , $collection->post_name, $post_link);
		} else {
			$other = sanitize_title(__('not-in-collection', 'mydomain'));
			return str_replace('%collection%' , $other, $post_link);
		}
	}
	return $post_link;
}
add_filter('post_type_link', 'setupItemPermalink', 1, 3);

This part works! When I use the_permalink for an item, it outputs:
http://www.mydomain.com/item/collection-name/item-slug/

But I’m not sure how I should setup my rewrites?
This is not working:

global $wp_rewrite;
$item_structure = '/item/%collection%/%item%/';
$wp_rewrite->add_rewrite_tag('%item%', '([^/]+)', 'item=');
$wp_rewrite->add_permastruct('item', $item_structure, false);

Any ideas?