Question

I’d like to add a unique ID field to my managed object entity model.

I know that Core Data doesn’t use ID relationships but this is different. I need a way of passing thread safe data to a different thread so that the new thread can then fetch the managed object from that data.

It can be in any format but ideally just a single object/variable/value.

I could add a CFUUID to the object as an NSString but I’m not sure if this is ideal? Should I be doing something else?

Any alternatives are welcome, or even just confirmation that CFUUID is the way to go.

Answer 1

as @Carl Veazey mention it:
The NSManagedObjectID is exactly what are you searching for!

and here ist a short snippet:

  NSManagedObject *objectInMainContext = ....;

  NSManagedObjectID *objectID = objectInMainContext.objectID;
  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    NSManagedObjectContext *newThreadContext = [[NSManagedObjectContext alloc] initWithConcurrencyType: ... ];    
    [newThreadContext objectWithID: objectID];
    ....
    ....
  });