OK I found the solution. Something must have been up with my core data sqlite
file because I trashed the app, tested it again and it worked as expected.
On 8 Feb 2013, at 09:06, Ben <southwestmons...@googlemail.com> wrote:
> I'm confused by the following code. What I'm trying to do is store a
> reference in a DogManagedObject transformable property, to a
> CatManagedObject, then retrieve the Cat from the Dog at a later date.
> However, when I log the output I get a class of 'Dog' rather than 'Cat'.
> Any ideas?
>
> //add the NSData
> NSURL *uri = [[catManagedObject objectID] URIRepresentation];
> NSData *uriData = [NSKeyedArchiver archivedDataWithRootObject:uri];
>
> //selectedInstrument is a transformable property
> dogManagedObject.selectedInstrument = uriData;
>
>
> [_managedObjectContext save:&error];
>
>
>
> //retrive the NSData
>
> NSData * data = (NSData *) dogManagedObject.selectedInstrument;
> NSURL *uri2 = [NSKeyedUnarchiver unarchiveObjectWithData:data];
> NSManagedObjectID *moID = [_persistentStoreCoordinator
> managedObjectIDForURIRepresentation:uri2];
> CatManagedObject * cat = (CatManagedObject *)[_managedObjectContext
> objectWithID:moID];
>
>
>
>
> NSLog(@"log %@", cat);
>
> Ouputs....
>
>
>
> log <DogManagedObject: 0x7853840> (entity: DogManagedObject; id: 0x7853f90
> <x-coredata://D9B53F16-BE02-4125-ACF1-ABF50835F296/DogManagedObject/p1> ;
> data: {
> cats = "<relationship fault: 0x784f670 'cats'>";
> selectedCat = "<62706c69 73743030 d4010203.... etc
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
