CODEWITHSUNDEEP
core-dataswiftui
Shawn
Shawn

Reputation: 443

Created Core Data Entity on child context faulted in SwiftUI body

Why wouldn't I be able to use this draft object within the view's body?

I've also tried:

extension NSManagedObjectContext {
    public func newChildContext() -> NSManagedObjectContext {
        let moc = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
        moc.parent = self
        return moc
    }
}

struct InternalContentView: View {
    private var context: NSManagedObjectContext

    @State private var draft: PlayerEntity

    init(context: NSManagedObjectContext) {
        self.context = context

        let childContext = context.newChildContext()
        draft = PlayerEntity.create(context: childContext)

        print("draft: \(draft)")
        print("draft id: \(draft.id?.uuidString ?? "unknown id")")
        print("draft is faulted: \(draft.isFault)")
    }

    var body: some View {
        printv("draft: \(draft)")
        printv("draft id: \(draft.id?.uuidString ?? "unknown id")")
        printv("draft is faulted: \(draft.isFault)")
        Text("")
    }
}

The output is:

draft: <PlayerEntity: 0x600001de6170> (entity: PlayerEntity; id: 0x600003e4fc60 <x-coredata:///PlayerEntity/t54BF6346-6299-479F-AD02-AC61AC056CCF2>; data: {
    email = nil;
    games =     (
    );
    id = "51BDEE17-DCA4-4EB9-8A56-0780ACFF55B3";
    "name_" = nil;
    teams =     (
    );
})
draft id: 51BDEE17-DCA4-4EB9-8A56-0780ACFF55B3
draft is faulted: false

draft: <PlayerEntity: 0x600001de6170> (entity: PlayerEntity; id: 0x600003e4fc60 <x-coredata:///PlayerEntity/t54BF6346-6299-479F-AD02-AC61AC056CCF2>; data: <fault>)
draft id: unknown id
draft is faulted: true

Upvotes: 0

Views: 201

Answers (1)

Joakim Danielson
Joakim Danielson

Reputation: 52033

Right now your child context only lives within the init but you will need to have access to it outside as well (or rather at least until you call save() on it)

So make it a property instead

struct InternalContentView: View {
    private var context: NSManagedObjectContext
    private var childContext: NSManagedObjectContext
    ...
  
    init() {
        self.context = context
        childContext = context.newChildContext()

Upvotes: 1

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