Core data save error with multiple persistent stores
Core data save error with multiple persistent stores
- Subject: Core data save error with multiple persistent stores
- From: Arthur C. <email@hidden>
- Date: Sun, 16 Nov 2008 21:02:37 +0100
- Importance: Normal
In my application I have two managed object contexts, as I need to be able to save two subsets of my Core Data setup separately.
These are both using one and the same persistent store coordinator; the coordinator has two stores.
I take care that every object instance gets inserted into the right managedObjectContext, by using [NSEntityDescription insertNewObjectForEntityForName: ...]. And it gets assigned to the right persistent store by using
- (void) awakeFromInsert
{
...
[managedObjectContext assignObject:self toPersistentStore: [persistentStoreCoordinator persistentStoreForURL: url]];
}.
There are no relationships between objects in different persistent stores, as it should be.
This seems to work OK on one system, but leads to a strange error on two other systems (for the same program).
When a change has been made to the Core Data objects (e.g. adding an instance), the 'save' action of the managedObjectContext gives an exception (no error screen) saying 'can't reassign object to a different store once it has been saved'.
This means the Core Data stack cannot be saved anymore, which is of course a serious problem.
Do you know what causes this error? Do I need to use a different setup for the managedObjectContext - persistentStoreCoordinator - persistentStores system?
Thanks for your time,
Arthur C.
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