New Twiddle

controllers.application.js

import Ember from 'ember';
import EmberObject, { computed, get } from '@ember/object';

export DateLogs = Ember.Object.extend({
  model: null,

  foodLogs: computed('model.foodLogs', function() {
    return get(this, 'model.foodLogs')
  }),

  foodLogLength: computed('foodLogs.[]', function() {
    return get(this, 'foodLogs.length');
  })
});

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  dateLogs: computed(function() {
  	return Ember.A([
    	EmberObject.create({
      	foodLogs: Ember.A([])
      }),
      
      EmberObject.create({
      	foodLogs: Ember.A([])
      })
    ]);
  }),
  
  foodLogs: computed(function() {
    const dateLogs = get(this, 'dateLogs');
  	let obj = EmberObject.create({
    	dateLogs: dateLogs.map((dateLog) => {
    		return DateLogs.create({ dateLog });
      }),
      
      foodLogsLength: computed('[email protected]', function() {
      	return get(this, 'dateLogs').mapBy('foodLogLength').reduce((acc, len) => {
        	return acc + len;
        }, 0)
      })
    })
    
    return obj;
  }),
  
  foodLogs2: computed('foodLogs.[]', function() {
  	return get(this, 'foodLogs');
  }),
  
  actions: {
  	insert(foodLogs) {
    	foodLogs.pushObject(1);
    },
    
    pop(foodLogs) {
    	foodLogs.popObject();
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{log foodLogs2}}

{{#each dateLogs as |dateLog|}}
	{{#each dateLog.foodLogs as |foodLog|}}
  	<span>Food Log {{foodLog}}</span><br>
  {{/each}}
{{/each}}

<button {{action "insert" dateLogs.0.foodLogs}}>Insert</button>
<button {{action "pop" dateLogs.0.foodLogs}}>Pop</button>

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": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}