Ember create a tweet resource relationship

I'm trying create a tweet. As you know, a tweet can be retweeted, lets look at my simplified model:

// # post-twitter model
export default DS.Model.extend({
  message: DS.attr('string'),
  retweet: DS.belongsTo('post-twitter', {async: false}),
});

retweet property means: this tweet has(has-once) a tweet nesthed.

Here is some data example:

{
  "post_twitter":[
    {
      "id":"1",
      "message":"Im a tweet",
      "retweet": "2", // This twitter has a retweet
    },
    {
      "id":"2",
      "message":"stackoverflowww!!!",
    },
  ],
}

When I'm trying render this my browser die in a loop:

// post-tweet component
<div class="post">
  {{post.message}}
  {{#if post.retweet}}
    {{debugger}}
  {{/if}}
  {{yield}}
</div>

While I debugging, post.retweet always is defined! debugging:

post = get('post')
rtw = post.get('retweet')
rtw2 = rtw..get('retweet') // Why? a self reference