How to make route work? Laravel Sluggable (Cviebrock) with category id-CodePudding

I'm new to Laravel, could you push me into the right direction?

I need to render blog post on url like this site.com/posts/1/slugged-url-of-the-post/, where 1 is the category_id.

I have no problem with site.com/posts/slugged-url-of-the-post/, but absolutely stuck with adding one more parameter to the route and making it work. The database is okay, and I have no problems with displaying the post category_id as a text value, for example, in the posts.show blade file.

Please, help?

routes/web.php

Route::get('/posts/{post}', function( App\Models\Post $post) {

// need to make this work:
// Route::get('/posts/{category_id}/{post}' ...

  return view('posts.show')->with('post', $post);
});

app/Models/Post.php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Cviebrock\EloquentSluggable\Sluggable;
use Cviebrock\EloquentSluggable\SluggableScopeHelpers;

class Post extends Model
{
    use HasFactory, Sluggable, SluggableScopeHelpers;

    public function sluggable(): array
    {
        return [
            'slug' => [
                'source' => 'title',
            ],
            
        ];
    }

    public function getRouteKeyName(): string
    {
        return 'slug';
    }

}

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