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Deprecation Guide for Using @each as a leaf node in a dependent key

Using @each at the end of a computed key is deprecated and will not work in Ember 2.0

invalid: Ember.computed('myObject.@each', function () {
  //no longer valid for monitoring changes to arrays

When defining dependent keys for computed properties, ember 2.0+ will treat @each and [] differently.

@each will monitor specific properties within an array of objects.

eachProp: Ember.computed('myObj.posts.@each.title', function () {
  //fired whenever one of the blog post titles is changed.

[] will monitor mutations to the array.

arrProp: Ember.computed('myObj.posts.[]', function () {
  //fired whenever a blog post is added or removed