Casade?

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  model: {
    label: '1',
    children: [{
      label: '1.1',
      children: [{
        label: '1.1.1',
        children: []
      }, {
        label: '1.1.2',
        children: []
      }]
    }, {
      label: '1.2',
      children: [{
        label: '1.2.1',
        children: []
      }, {
        label: '1.2.2',
        children: []
      }]
    }]
  },
  
  change() {
    let model = this.get('model');
    Ember.A(model.children).popObject();
  }
});

application.template.hbs

{{tree-node model=model}}
<button onclick={{action change}}>Change</button>

components.tree-node.template.hbs

{{model.label}}
{{#each model.children as |child|}}
	{{tree-node model=child}}
{{/each}}

twiddle.json

{
  "version": "0.6.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}