New Twiddle

adapters.application.js

import ActiveModelAdapter from 'active-model-adapter';

export default ActiveModelAdapter.extend({
	shouldBackgroundReloadRecord() {
    return false;
  }
});

adapters.post.js

import Adapter from 'ember-data/adapter';

export default Adapter.extend({
  findRecord() {
		return new Promise(() => { /* never resolve */ });
  }
});

components.my-blog.js

import Ember from 'ember';

let COMPUTED = 0;

export default Ember.Component.extend({
  commentsLoaded: Ember.computed('[email protected]', function() {    
    let count = ++COMPUTED;
    
    document.getElementById('computed').innerText = count;
    
    return this.get('posts').every(post => post.get('commentsLoaded'));
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

models.blog.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';

export default Model.extend({
  posts: hasMany({ async: true })
});

models.comment.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';

export default Model.extend({
});

models.post.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';
import Ember from 'ember';

export default Model.extend({
  comments: hasMany({ async: true }),
  commentsLoaded: Ember.computed.alias('comments.isSettled'),
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return Promise.resolve().then(() => {
      this.store.pushPayload('blog', {
	      blog: {
          id: 'blog-0',
          post_ids: [
            'post-0',
            'post-1',
            'post-2',
            'post-3',
						'post-4',
						'post-5',
						'post-6',
						'post-7',
						'post-8',
						'post-9',
						'post-10',
            // uncomment this last one to trigger an infinite re-render assertion
						// 'post-11'
          ]
        }
      });
    }).then(() => {
      return this.store.findRecord('blog', 'blog-0');
    });
  }
});

templates.application.hbs

<p>Uncomment the last post id in application route to see the bug.</p>

<div>Computed: <span id="computed">0</span></div>

<MyBlog @posts={{this.model.posts}} />

templates.components.my-blog.hbs

Comments: {{#if this.commentsLoaded}}loaded!{{else}}loading...{{/if}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.5",
    "ember-template-compiler": "3.4.5"
  },
  "addons": {
    "ember-data": "3.4.1",
    "active-model-adapter": "2.2.0"
  }
}