Remove Core Data from iCloud fails - ios

Question

I'm trying to remove Core Data from iCloud using [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:options:error:].
But I get strange output:
__93+[NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:options:error:]_block_invoke(1982):
CoreData: Ubiquity: Unable to move content directory to new location:
file:///private/var/mobile/Library/Mobile%20Documents/<UBIQUITY_ID>/
New: file:///private/var/mobile/Library/Mobile%20Documents/OldUbiquitousContent-mobile~C9439AD0-1E87-4977-9C68-0674F5E2E93B
Error Domain=NSCocoaErrorDomain Code=513 "The operation couldn’t be completed.
(Cocoa error 513.)" UserInfo=0x181ab790 {NSSourceFilePathErrorKey=/private/var/mobile/Library/Mobile Documents/<UBIQUITY_ID>,
NSUserStringVariant=(
Move
), NSFilePath=/private/var/mobile/Library/Mobile Documents/<UBIQUITY_ID>,
NSDestinationFilePath=/private/var/mobile/Library/Mobile Documents/OldUbiquitousContent-mobile~C9439AD0-1E87-4977-9C68-0674F5E2E93B,
NSUnderlyingError=0x181aab50 "The operation couldn’t be completed. Operation not permitted"}
What does it mean?
How to avoid it? I'm working on iCloud disable/enable feature. Details HERE
UPDATE:
NSDictionary *iCloudOptions =
[NSDictionary dictionaryWithObjectsAndKeys:kICloudContentNameKey, NSPersistentStoreUbiquitousContentNameKey,
iCloudURL, NSPersistentStoreUbiquitousContentURLKey, nil];
// self.lastICloudStoreURL stores NSPersistentStore.URL after stack setup
BOOL result = [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:self.lastICloudStoreURL
options:iCloudOptions
error:&error];

Answer 1

Normally (before iOS7), you take the ubiquitousContentURL value from [fileManager URLForUbiquityContainerIdentifier:nil];
and pass it as an option called NSPersistentStore UbiquitousContentURLKey, and this is how iCloud know where to keep all of your data in the iCloud account.
In iOS 7 and Mac OS X we don't need to pass a value for that at all, and Apple call URLForUbiquitous ContainerIdentifier automatically under the hood for you.
So the solution looks like this:
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:kICloudContentNameKey, NSPersistentStoreUbiquitousContentNameKey, nil];
NSURL *storeURL = [NSPersistentStore MR_urlForStoreName:[MagicalRecord defaultStoreName]];
BOOL result = [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:storeURL options:options error:&error];
I suggest you to check WWDC 2013 session 207 to get this things clearly.

Answer 2

NSCocoaErrorDomain error 513 is defined in FoundationErrors.h as NSFileWriteNoPermissionError. You don't have the required permissions to write to the location.
This can happen if a managed object context is still using objects that are backed by this store. The context is actively using the file that is being moved, which results in a NSFileCoordinator conflict. Two things are trying to access the file with write permission at the same time.

Answer 3

The removeUbiquitousContentAndPersistentStoreAtURL:options:error: method deletes all of the user's local and cloud data—this is probably not what you want. Instead, migrate your store to a new location on disk and use the NSPersistentStoreRemoveUbiquitousMetadataOption option with the migratePersistentStore:toURL:options:withType:error: method.
See Disabling iCloud Persistence at Removing an iCloud-enabled Persistent Store in the iCloud Programming Guide for Core Data.