Open Radar

 
Summary: As suggested, I tried to implement a simple example of an app that uses two persistent stores do separate the data between local and cloud. The first thing that I did is implement the example with one persistent store using the iCloud options dictionary. That worked fine. 

After that I changed the code to first insert a local (with no options dictionary) persistent store and then used the same code used before to try (depending on the value of the cloudURL object) to insert the cloud persistent store. The persistent store is added successfully. 

When I'm creating a new managed object, I check if the persistent store coordinator has two persistent stores. If it has, I'm using the method assignObject:toPersistentStore: to assign this new object to the cloud persistent store. Based on the ~/Library/Mobile Documents folder on my Mac, that is working. 

The problem comes on the other device. It should receive the NSPersistentStoreDidImportUbiquitousContentChangesNotification, but instead the same two error always appear on the console. And they reappear repeatedly  after a few seconds:

2011-11-01 20:34:54.023 iCloudTest2[975:2403] CoreData: Ubiquity: Error importing transaction log: <PFUbiquityTransactionLog: 0x1f3d60>
	transactionLogLocation: <PFUbiquityLocation: 0x1f0ab0>: /private/var/mobile/Library/Mobile Documents/9GW85QW7HW~br~com~fernandodeperto~iCloudTest2/test_6/mobile.1FBC53AA-0881-5362-8C0D-32DC21BC92B5/br.com.fernandodeperto.iCloudTest2.6/shjumhMHJj17_m8uQXaO6Cr~lALxJF8ETR7T5q56_MY=/796CDC9D-0064-46E9-BEF8-377873C4CE7E.1.cdt
	transactionNumber: 1
, exception: -[__NSCFDictionary setObject:forKey:]: attempt to insert nil key

2011-11-01 20:34:54.032 iCloudTest2[975:2403] -[_PFUbiquityRecordsImporter operation:failedWithError:](839): CoreData: Ubiquity:  Import operation ecountered an error: Error Domain=NSCocoaErrorDomain Code=134060 "The operation couldn’t be completed. (Cocoa error 134060.)" UserInfo=0x15d630 {exception=-[__NSCFDictionary setObject:forKey:]: attempt to insert nil key} while trying to import the log file at the URL: <PFUbiquityTransactionLog: 0x1f3d60>
	transactionLogLocation: <PFUbiquityLocation: 0x1f0ab0>: /private/var/mobile/Library/Mobile Documents/9GW85QW7HW~br~com~fernandodeperto~iCloudTest2/test_6/mobile.1FBC53AA-0881-5362-8C0D-32DC21BC92B5/br.com.fernandodeperto.iCloudTest2.6/shjumhMHJj17_m8uQXaO6Cr~lALxJF8ETR7T5q56_MY=/796CDC9D-0064-46E9-BEF8-377873C4CE7E.1.cdt
	transactionNumber: 1

Steps to Reproduce: During the persistent store coordinator setup: insert a local persistent store; insert a cloud persistent store. On the MasterViewController, while adding a new managed object: check if the persistent store coordinator has two persistent stores; if it has, use the assignObject:toPersistentStore: method to assign it to the cloud persistent store; save the context.

Expected Results: The second device should receive the NSPersistentStoreDidImportUbiquitousContentChangesNotification and then the managed object should appear on the MasterViewController's table view.

Actual Results: The second device generates the same two errors repeatedly (check above).

Regression:

Notes: The local and cloud persistent stores are both being saved on the application's document directory but with different file names