Multiple Permalinks for custom post type post

Question

is there a way to have multiple permalinks for a custom post type post?

For example:

The normal permalink url is called:

https://www.example.com/test-subject/test-title

I also want the post is reachable under the following urls:

https://www.example.com/test-subject/post_id

https://www.example.com/ts/post_id

I know that I can manual add in the .htaccess, but I add the post inside my plugin. So what is the best method to add these urls to a post and make them accessable?

I need some suggestions, not code solution.

Answer 1

Yes this is possible using add_rewrite_rule(), something along the lines of

add_rewrite_rule(
    'test-subject/(\d+)/?',
    'index.php?post_type=CPT_slug&post_id=$matches[1]'
);
add_rewrite_rule(
    'ts/(\d+)/?',
    'index.php?post_type=CPT_slug&post_id=$matches[1]'
);

It might be a bit trickier though, since test-subject/test-title and test-subject/post_id are quite similar. Adding the post_id-rule with the 3rd argument as 'top' might help.