RestKit error stack trace

apx-restkit-error-stacktrace.txt

2011-08-29 11:14:04.308 APXClient[22687:11f03] -[NSCFString managedObjectContext]: unrecognized selector sent to instance 0xa12a0d0
2011-08-29 11:14:04.310 APXClient[22687:11f03] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString managedObjectContext]: unrecognized selector sent to instance 0xa12a0d0'
*** Call stack at first throw:
(
	0   CoreFoundation                      0x016cb5a9 __exceptionPreprocess + 185
	1   libobjc.A.dylib                     0x0181f313 objc_exception_throw + 44
	2   CoreFoundation                      0x016cd0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
	3   CoreFoundation                      0x0163c966 ___forwarding___ + 966
	4   CoreFoundation                      0x0163c522 _CF_forwarding_prep_0 + 50
	5   APXClient                           0x000b338b -[RKManagedObjectMapping mappableObjectForData:] + 1225
	6   APXClient                           0x000865c8 -[RKObjectMapper objectWithMapping:andData:] + 809
	7   APXClient                           0x00085cdd -[RKObjectMapper mapCollection:atKeyPath:usingMapping:] + 1807
	8   APXClient                           0x00086eb3 -[RKObjectMapper performMapping] + 2260
	9   APXClient                           0x0007907d -[RKObjectLoader mapResponseWithMappingProvider:toObject:error:] + 1230
	10  APXClient                           0x000795e9 -[RKObjectLoader performMapping:] + 989
	11  APXClient                           0x0007966e -[RKObjectLoader performMappingOnBackgroundThread] + 125
	12  Foundation                          0x00eb8cf4 -[NSThread main] + 81
	13  Foundation                          0x00eb8c80 __NSThread__main__ + 1387
	14  libsystem_c.dylib                   0x9669bed9 _pthread_start + 335
	15  libsystem_c.dylib                   0x9669f6de thread_start + 34
)

Here are the specific code block in mappableObjectData that is causing the error. It's failing the test because primaryKeyValue is nil, and falling into the else block. Then the insert into context fails.

    if (primaryKeyAttribute && primaryKeyValue) {                
        object = [objectStore findOrCreateInstanceOfEntity:entity withPrimaryKeyAttribute:primaryKeyAttribute andValue:primaryKeyValue];
        NSAssert2(object, @"Failed creation of managed object with entity '%@' and primary key value '%@'", entity.name, primaryKeyValue);
    } else {
        object = [[[NSManagedObject alloc] initWithEntity:entity
                           insertIntoManagedObjectContext:objectStore.managedObjectContext] autorelease];
    }