emberjs/ember.js — pull request #3257 by kumavis (2013-08-29 21:24:50+00:00)
Title: SortableMixin - Pass in propertyName to sortFunction

We're doing some complex sorting based on the key and having access to the `propertyName` would be really useful.

For example, sorting `dueDate` should be ascending (earliest first), but `updatedAt` should be descending (latest first).