从核心数据swift获取关系4

I have an Artist and album Entity. I am able to retrieve all of the covers from the Album entity. However I cant figure out how to fetch only covers assigned to an specific artist. As far as I understand this should have some kind of Predicate with specific condition to retrieve that. I am trying to work on the core data relationship to retrieve a cover attribute from the Album entity. Please see attached screens from the core data editor. As well as the code I am trying to implement. I have an Artist and album Entity. I am able to