Swift Core Data - Request with distinct results

Question

how I can call es request with distinct values in swift?

This is my code:

let appDelegate: AppDelegate = UIApplication.sharedApplication().delegate a         


        

Answer 1

You need to set

request.resultType = NSFetchRequestResultType.DictionaryResultType

It returns dictionaries, but the distinct filter should work.

If you do not want to go down that route, filter in memory (also recommended). Do a normal fetch and then

let distinct = NSSet(array: results.valueForKeyPath("docID") as [String])

With Swift 2.0 I prefer

let distinct = NSSet(array: results.map { $0.docID })