Access parent component in source function

controllers.application.js

import Ember from 'ember';
import myTemplate from '../templates/suggestion-template'

export default Ember.Controller.extend({
  suggestionTemplate: myTemplate,
  
  getDisplayString : function(suggestion) {
    if(typeof suggestion === "string")
      return suggestion;
    return suggestion.text;
  },
  updateValue: function(newValue){
    this.set('searchInput', getDisplayString(newValue))
	},
  actions: {
suggestSource: function(query, syncResults, asyncResults) {
    // this should be the this controller
    // but it seems to be the
    // jquery typeahead component
    console.log("this", this);
    if(query == 'test')
      syncResults([{id: 2, text: "testing is fun!"}]);
	  else
      syncResults([{id: 1, text: "test"}]);
    },
  }
});

templates.application.hbs

{{aupac-typeahead 
    action=(action updateValue) 
    class='form-control' 
    source=(action 'suggestSource')
    placeholder='Search...' 
    allowFreeInput=true
    display=getDisplayString
    transformSelection=getDisplayString
    suggestionTemplate=suggestionTemplate
    }}
{{outlet}}

templates.suggestion-template.hbs

{{model.text}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.1",
    "ember-template-compiler": "2.6.0"
  },
  "addons": {
  	"ember-aupac-typeahead": "2.0.7"
  }
}