Deprecation Guide for Controller.needs

needs for controllers will be removed in Ember 2.0. You can migrate away from this using Ember.inject.controller.

Lets say you have a post controller like this:

import Ember from 'ember';

export default Ember.Controller.extend({
  needs: ['comments'],
  newComments: Ember.computed.alias('controllers.comments.newest')
});

You can upgrade to Ember.inject.controller like this:

import Ember from 'ember';

export default Ember.Controller.extend({
  comments: Ember.inject.controller(),
  newComments: Ember.computed.alias('comments.newest')
});