NSValueTransformer + MagicalRecord + Mogenerator

Question

I can't get my NSValueTransformer implementation to get called upon calling save:(NSErrro **) on my ManagedObjectContext.

I've already tried to fix this problem by wring my own ManagedObject-Class and not relying on Mogenerator, without any success.

Here is a screenshot of my entity configuration:

Here is my NSValueTransformer-Subclass (non of the breakpoints will be hit):

And here is how i create the model and save the context. I've also tried to use the MR_create and MR_saveToPersistentStoreCoordinator-Methodes for crating and saving but without any success.

Why does core data not execute my NSValueTransformer code when saving the entity to the persistent store coordinator?

Answer 1

Turns out that it's super important that the NSManagedObjectContext is directly connected to the NSPersistentStoreCoordinator. There seems to be a difference between using [NSMangedObjectContext MR_default] and the following expression:

NSPersistentStoreCoordinator *coordinator = [NSPersistentStoreCoordinator MR_defaultStoreCoordinator];
NSManagedObjectContext *context = [NSManagedObjectContext MR_contextWithStoreCoordinator:coordinator];

I've modified the above code so it uses the other NSManagedObjectContext, now my NSValueTransformer will be hit.

Session *session = [self getSession];
[session MR_deleteEntityInContext:context];

session = [Session sessionWithFirstName:firstName surname:surname response:jsonResponse andContext:context];
[context MR_saveToPersistentStoreWithCompletion:nil];

So my problem is solved - in case somebody knows why I can't use [NSManagedObjectContext MR_default] I would be very interested!