title: Core Data: How to fetch those managed objects?
body: <p>I have two entities: Department and DepartmentNews. Every Department has one or many DepartmentNews Objects. Inside DepartmentNews, there is an newsTitle attribute, and there is an releaseDate attribute.</p>
  
  <p>I want to fetch all those Department objects and sort them by their associated DepartmentNews newsTitle with the latest releaseDate.</p>
  
  <p>Is it possible to make a predicate for this? Probably with subqueries? How could something like this be done? I'm using the NSFetchedResultsController...</p>