NSBatchDeleteRequest in Swift 3 for iOS 10 only?

Question

So, migrating my code to

Swift 3

has me a bit stuck. It seems

NSBatchDeleteRequest

requires

iOS 10

now? The only way I could make the code build is with the following snippet:

func removeAllChargerData(){

    // Remove all charging data from persistent storage

    let fetchRequest: NSFetchRequest<NSFetchRequestResult> = ChargerPrimary.fetchRequest()

    let entity = NSEntityDescription.entity(forEntityName: "ChargerPrimary", in: self.secondMoc)

    fetchRequest.entity = entity

    let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)



    do {

        try self.secondMoc.execute(deleteRequest)

    } catch {

        let deleteError = error as NSError

        NSLog("\(deleteError), \(deleteError.localizedDescription)")

    }



}

However, a warning shows up indicating that

fetchRequest()

is only available in

iOS 10

and newer. If I define the

fetchRequest

the following way, I get an error because it expect the

fetchRequest

to has a

NSFetchRequestResult

argument type:

let fetchRequest = NSFetchRequest<ChargerPrimary>(entityName: "ChargerPrimary")

Answer 1

You just need to specify the correct type for the generic:

let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "ChargerPrimary")