iOS7 NSMergeConflict on Single Thread Save

Question

Am having problems with a simple data save on a single threaded app after two rows have been re-ordered.

I\'ve managed to simplify the coding to reproduce the error and

Answer 1

I had similar issues an found a workaround here:

http://prod.lists.apple.com/archives/cocoa-dev/2013/Oct/msg00657.html

In short - add this to your MOC setup:

  [_managedObjectContext setMergePolicy:[[NSMergePolicy alloc] initWithMergeType:NSMergeByPropertyObjectTrumpMergePolicyType]];

This affects OS X 10.9 Mavericks as well when using NSSQLStoreType. I could not repeat the Merge error using NSXMLStoreType.

For Swift 2.x

managedObjectContext.mergePolicy = NSMergePolicy(mergeType: .MergeByPropertyObjectTrumpMergePolicyType)