Hi,
I'm having trouble implementing a NSEntityMigrationPolicy. Has anyone
used subclasses of NSEntityMigrationPolicy in macruby successfully?
I've narrowed it down to the empty macruby implementation, which looks
like this:
{{{
class V3RecipeIngredientToIngredient < NSEntityMigrationPolicy
def createDestinationInstancesForSourceInstance(source,
entityMapping:mapping, manager:manager, error:error)
return true
end
def createRelationshipsForDestinationInstance(dInstance,
entityMapping:mapping, manager:manager, error:error)
true
end
end
}}}
when I run this (and do a addPersistentStoreWithType with
NSMigratePersistentStoresAutomaticallyOption) I get:
#<Class:0x10145fc80>: An error occured during persistent store
migration.
userInfo: {"NSUnderlyingException"=>#<_NSCoreDataException:0x8002d8840>}
the _NSCoreDataException does not seem to have any message or other
chain of errors.
the corresponding Objective C empty implementation works fine:
{{{
- (BOOL)createDestinationInstancesForSourceInstance:
(NSManagedObject*)source
entityMapping:
(NSEntityMapping*)mapping
manager:
(NSMigrationManager*)manager
error:(NSError**)error
{
return YES;
}
}}}
Is there any way to get more detail on how/why it is failing?
Cheerio,
Michael Johnston
[email protected]
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