Re: Core data save error with multiple persistent stores
Re: Core data save error with multiple persistent stores
- Subject: Re: Core data save error with multiple persistent stores
- From: Quincey Morris <email@hidden>
- Date: Sun, 16 Nov 2008 12:25:51 -0800
On Nov 16, 2008, at 12:02, Arthur C. wrote:
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?
The example in the documentation:
http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdCreateMOs.html#/
/apple_ref/doc/uid/TP40001654-SW2
does the assignment immediately after the
"insertNewObjectForEntityForName" call, not in "awakeFromInsert".
I'm wondering if undo is what's causing your problem. If not undo,
then some other circumstances that leads to "awakeFromInsert" being
called when the object is not really brand-new.
Have you tried doing it the way Apple's example shows?
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