Two level CPT-onomy rewrite rule

Hey there,
I would first like to say thank you for the good work, I’m running my first project on wordpress and find your plugin both useful and easy to use 🙂

Here’s what I’m trying to do:

I have three CPT:

– Companies
– Company categories
– Samples

Company categories are CPTonomy for companies,
Companies are CPTonomy for Samples

I want to be able to use this URL:
site/samples/{company-category-name}

To reach an archive page of samples which displays only samples linked to companies linked to this particular company-category.

Kind of using the taxonomy’s taxonomy of a custom post (things start to be complicated over here :D)

Here is part of my function.php:

add_filter('rewrite_rules_array', 'mmp_rewrite_rules');

function mmp_rewrite_rules($rules) {

    $newRules                               = array();
    $newRules['companies/(.+)/(.+?)$'] = 'index.php?companies=$matches[2]';
    $newRules['companies/(.+)/?$']          = 'index.php?post_type=companies&company_categories=$matches[1]&cpt_onomy_archive=1';
    $newRules['companies/?$']          = 'index.php?post_type=companies'; 

    $newRules['samples/(.+)/(.+?)$'] = 'index.php?samples=$matches[2]';
    $newRules['samples/(.+)/?$']          = 'index.php?post_type=samples&company_categories=$matches[1]&cpt_onomy_archive=1';
    $newRules['samples/?$']          = 'index.php?post_type=samples';

    return array_merge($newRules, $rules);
}

function filter_post_type_link($link, $post)
{
    if ($post->post_type != 'companies' && $post->post_type != 'samples'){
        return $link;
    }

    if($post->post_type == 'samples'){
	    if ($cats = get_the_terms($post->ID, 'companies')){
	    	$cat = array_pop($cats);

	    	if ($cats = get_the_terms($cat->term_id, 'company_categories')){
	        	$link = str_replace('%company_categories%', array_pop($cats)->slug, $link);
	    	}

	    }
	}

    if($post->post_type == 'companies'){
	    if ($cats = get_the_terms($post->ID, 'company_categories')){
	        $link = str_replace('%company_categories%', array_pop($cats)->slug, $link);
	    }
	}

    return $link;
}

add_filter('post_type_link', 'filter_post_type_link', 10, 2);

I tried to change the query_var of the companies CPT by “category_name” and to use this line:
$newRules['samples/(.+)/?$'] = 'index.php?post_type=samples&companies=$matches[1]&cpt_onomy_archive=1';

but I still got Page not found on site/samples/{company-category-name} AND also on company page (which I did not before). So the solution seems to be somewhere…

Do you got some of your magic for me ?

Thank you very much !

https://ww.wp.xz.cn/plugins/cpt-onomies/