How to get dynamic segment id inside a hook in the Ember REST adapter

Assuming we have URL like /posts/awesome-post/comments (which is /posts/1/comments which is /posts/:post_id/comments)

We have comment adapter

export default DS.RESTAdapter.extend({
  pathForType(modelName) {
    // how to get :post_id here?
  }
});

How to get Awesome Post's id (:post_id) inside pathForType hook in the comment adapter?