ff select options debugging

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  change(e) {
    this.sendAction('action', this.get(`options.${e.target.selectedIndex}`));
  },
  
  didReceiveAttrs() {
    Ember.run.scheduleOnce('afterRender', () => {
      this.$('select')[0].value = this.get('options').indexOf(this.get('value'));
    });
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
	optionsA: Ember.computed(function() {
    return [{
      name: 'A'
    }, {
      name: 'B'
    }, {
      name: 'C'
    }, {
      name: 'Create New' 
    }];
  }),
  
	init() {
    this.set('selectedValue', this.get('optionsA.2')); 
  },
  
  actions: {   
    update(newValue) {
      if (newValue.name === 'Create New') {
        const newThing = { name: 'I am new' };
        const original = this.get('optionsA');
        const newArray = original.slice();
        newArray.splice(original.length - 1, 0, newThing);
        this.set('optionsA', newArray);
        this.set('selectedValue', newThing);
      } else {
        this.set('selectedValue', newValue); 
      }
    }
  }
});

helpers.eq.js

import Ember from 'ember';

export function eq([a, b]) {
  return a === b;
}

export default Ember.Helper.helper(eq);

helpers.index-of.js

import Ember from 'ember';

export function indexOf([haystack, needle]) {
  return haystack.indexOf(needle);
}

export default Ember.Helper.helper(indexOf);

helpers.to-string.js

import Ember from 'ember';

export function toString([value]) {
  return String(value);
}

export default Ember.Helper.helper(toString);

templates.application.hbs

{{my-component options=optionsA value=selectedValue action=(action "update")}}

value: {{selectedValue.name}}

templates.components.my-component.hbs

<select>
	{{#each options key="name" as |option index|}}
  	<option value={{index}} selected={{eq option value}}>
    	{{option.name}} (selected: {{eq option value}})
    </option>
  {{/each}}
</select>

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"
  }
}