Component template inheritance

components.child-component.js

import Ember from 'ember';
import Parent from './parent-component';

export default Parent.extend({
  foo: 'bar'
});

components.child-with-layout.js

import Ember from 'ember';
import Parent from './parent-component';
import layout from '../templates/components/parent-component';

export default Parent.extend({
  foo: 'bar',
  layout
});

components.grandchild-component.js

import Ember from 'ember';
import MyParent from './child-with-layout';
// causes an error:
// import layout from '../templates/components/child-with-layout';
//works, but requires knowing what your parent is inheriting from:
import layout from '../templates/components/parent-component';

export default MyParent.extend({
  foo: 'baz',
  layout
});

components.parent-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  foo: 'foo'
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
parent: {{parent-component}}
<br>
child: {{child-component}}
<br>
^ i'd expect this to be "parent component template. foo is: baz" instead of blank
<br>
<br>
adding a "layout" makes it work: {{child-with-layout}}
<br>
<br>
but following the same pattern to create a grandchild breaks, so your grandchild needs to know about the existence of it's grandparent: {{grandchild-component}}
<br>
{{outlet}}

templates.components.parent-component.hbs

{{yield}}
parent component template. foo is: {{foo}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}