Access Attr

controllers.application.js

import Ember from 'ember'
import TypeChecker from '../mixins/type-checker'

export default Ember.Controller.extend(TypeChecker, {
  prop: 'controller property'
})

mixins.type-checker.js

import Ember from 'ember'

const { computed } = Ember

export default Ember.Mixin.create({
  isRoute: computed('target',function(){
    const isUndefined = typeof this.get('target') === 'undefined'
    return isUndefined ? true : false
  }),
  isController: computed('target',function(){
    const isUndefined = typeof this.get('target') === 'undefined'
    return isUndefined ? false : true
  }),
  getAttribute(attr){
    let attrYouWant
    if(this.get('isController')){
      attrYouWant = this.get(attr)
    }else{
      attrYouWant = this.controllerFor(this.routeName).get(attr)
    }
    return attrYouWant
  }
})

routes.application.js

import Ember from 'ember'

import TypeChecker from '../mixins/type-checker'

export default Ember.Route.extend(TypeChecker, {
  actions: {
    test(){
      const testProp = this.getAttribute('prop')
      console.log(testProp)
    }
  }
})

templates.application.hbs

<button {{action 'test'}}>Test</button>

twiddle.json

{
  "version": "0.8.0",
  "EmberENV": {
    "LOG_VERSION": false,
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}