Deprecation Guide for ArrayController

Just like Ember.ObjectController, Ember.ArrayController will be removed in Ember 2.0 for the same reasons mentioned in 1.11's ObjectController deprecation.

To migrate from an explicitly defined array controller, first convert the class definition to inherit from Ember.Controller.

Before:

import Ember from "ember";

export default Ember.ArrayController.extend({
});

After:

import Ember from "ember";

export default Ember.Controller.extend({
});

Next update any use of {{modelPropertyName}} in templates with {{model.modelPropertyName}}. You should also review any computed property dependent keys, observer keys, and get and set statements on the route and controller. An example of how to make this migration can be found in this PR to the Ghost project.

Opposite to 1.11's ObjectController deprecation, if a controller is not explicitly defined, but instead is being auto-generated by the framework, it will not throw a deprecation message even if the proxying behavior is being used.

Added in PR #11476.