Data not shown when directly accessing a URL in nested Ember Route

Question

I have a nested route setup as I would like to have my templates nested as well. The route setup looks like this:

...

      this.route('posts', function() {
        this.route('post', {path: ':post_id'}, function() {
          this.route('comments',  {path: 'comments'}, function() {
            this.route('comment',  {path: ':comment_id'});
          });
        });
      });

...

Potentially, my URL could look something like this: /posts/:post_id/comments/:comment_id

If I navigate via {{link-to}} then I have no problem, however, if I go directly to a specific URL via the browser, that's when things going wrong. Imagine that my comments page lists the comments associated with the post (post_id) I'm looking at. The problem is going there directly, like typing in /posts/123/comments/56 doesn't load the list of comments, only the comment itself. Here is how my routes are setup:

// routes/posts.js
...
model() {
    return this.get('store').findAll('post');
}
...

// routes/posts/post.js
...
model(params) {
    return this.get('store').findRecord('post', params.post_id);
}
...

// routes/posts/post/comments.js
...
model(params) {
    let post=this.modelFor('posts/post');
    return post.get('comments');

}
...

// routes/posts/post/comments/comment.js
...
model(params) {


    return this.store.findRecord('comment', params.comment_id);

}
...

If I type in /posts/123/comments/56 , no list is displayed from the comments.js template.

If I type in /posts/123/comments , only the first comment is displayed from the comments.js.

I'm not sure what I'm doing wrong though I feel like it has something to do with modelFor. How do I properly populate/hydrate the post's comments list when I go directly to a comment in that post URL rather than navigating there via link-to?

UPDATE 1: Here are the models:

// post.js
export default DS.Model.extend({
    title: DS.attr("string"),
    articles: DS.hasMany('comment', {async: true})
});
// comment.js
export default DS.Model.extend({
    title: DS.attr("string")
});

I've connected it to mirage.

Here is a sample of the comments fixture:

[
    {
        id: 1,
        title: "Apple"
    },
...

and the posts fixture:

[
    {
        id: 1,
        title: "A post with fruits for comments",
        commentIds: [1, 2]
    },
...

UPDATE 2:

I've added my template code for templates/posts/post/comments.js

Comments.js!
{{outlet}}
<ol>
    {{#each model as |comment|}}
        <li>{{#link-to "posts.post.comments.comment" comment}} {{comment.title}}{{/link-to}}</li>
    {{/each}}
</ol>

I've also updated the comment.js route above, reducing its complexity.

Answer 1

Based on your router definitions - the URL /post/123/comments/56 does not exists. Your router defines URL with the following structure /posts/56/comment/123 (notice singular comment not comments) - your route name is comments however you told ember that the path it should resolve is comment - singular. So, try accessing /post/123/comment/56 instead of comments. Also, no reason to call this.modelFor('posts/post') from nested comments route - all you should need is modeFor('post'). And the last thing, inside the comment route you should only need to look for a give comment no need to resolve the parent model - you already have a unique comment_id - store.findRecord('comment', comment_id) should work.