Ember Model correct way Post and Comments Async

I have a initial page where shows all posts. Post as many comments, but in this initial page I don't wanna show comments. When User click in a post, the application goes to url posts/post/1 in this page I wanna show the comments of post.

My server has this endpoint

My server should provide separates endpoints for /posts and /comments or posts/:id/comments/ ?

what/how is the right way to fetch(fetch or find)?

Model

// Post
export default DS.Model.extend({
  message: DS.attr('string'),
  comments: DS.hasMany('comment'),
});

// Comment
export default DS.Model.extend({
  message: DS.attr('string'),
  post: DS.belongsTo('post'),
});