Core data, NSArrayContainer Arraycontent of many arrays

Question

Hello

I've got three entities in my application so far: tag, feed and story

A tag has got a to-many relationship to feeds and feeds has got a to-many relationship to story.

I've got an NSArrayController for each entity, one named tags, one named feeds and one named stories. They all share the same 'managedObjectContext' which they get from the file's owner. the content set of the AC named feeds is bound to 'tags' controler key: selection, key path: feeds

I want the content set of the third array to be bound to all of the stories in all of the feeds in the selected tag: i tried to use the key path: "@unionOfArrays.stories" but couldn't get it to work.

Any idea how i would go about this?

Answer 1

You can try @distinctUnionOfSets.stories. All Core Data 1-n relationships are implemented as sets.