Add %post_id% to slug of custom post type and prevent the "unique slug" thing that WP does?

Question

I have a custom post type called "equipment". I would like the permalink structure to be:

example.com/equipment/%post_id%-slug

I specifically want it to use a dash and not a slash (i.e. - "id-slug" not "id/slug"). Every possible solution I've found from googling has used slashes and I just can't get it to work with a dash.

I also want to prevent WordPress from adding on the additional number if there's two posts with the same title. Example:

example.com/equipment/45-awesomeness
and
example.com/equipment/46-awesomeness-2

I think the solution is to use add_rewrite_rule, but I'm a bit confused with the regex stuff.

The following code did work to replace the post name with the id in the slug:

function equipment_links($post_link, $post = 0) {
    if($post->post_type === 'equipment') {
        return home_url('equipment/' . $post->ID . '');
    }
    else{
        return $post_link;
    }
}
add_filter('post_type_link', 'equipment_links', 1, 3);


function equipment_rewrites_init(){
    add_rewrite_rule('equipment/([0-9]+)?$', 'index.php?post_type=equipment&p=$matches[1]', 'top');
}
add_action('init', 'equipment_rewrites_init');

It did return a url of "example.com/equipment/123", but I would like to tack on "-post_name" to the end of that "123".

Answer 1

I don't have much experience with coding rewrites, but could you just add $post->post_name into your return statement?

return home_url('equipment/' . $post->ID . '-' . $post->post_name );

There are a few other ways to change the permalinks that I have used that may also help you:

1. The easiest way to change your permalink structure is probably to use a custom structure by going to the admin menu, settings > permalinks. Select custom structure and set it to /%post_id%-%postname%/
2. If you are looking to edit the permalink structure for the specific post type without touching any code or another post type, I would suggest downloading a plugin like "Custom Post Type Permalinks" or "Simple Post Type Permalinks" both by Toro_Unit.

In regards to the unique identifier, you want to remove at the end.. I don't have that answer. However, if you are willing to use a .htacess rewrite instead of php, you may want to give this a try:

https://stackoverflow.com/questions/14635438/remove-trailing-number-from-url-via-htaccess