RestKit合并上下文函数是零属性

Question

所以我创建了一个对象

MyObject *object = [mainManagedObjectContext insertNewObjectForEntityForName:@"MyObject"];

SomeOtherObject *someOtherObject = [s_mainManagedObjectContext insertNewObjectForEntityForName:@"MyObject"];

// in case you're wondering the inverse relationship of someOtherObject's relation ship to myObject is one to many
// so this should remove the idea that setting someOtherObjects.relationship to something else was causing the property to nil
object.oneToOneRelationShip = someOtherObject;

// simply used for debuggin
[object addObserver:self forKeyPath:@"oneToOneRelationShip" options:NSKeyValueObservingOptionInitial context:nil];

然后我使用对象管理器发布对象来发布这个东西

NSMutableURLRequest *request = [objectManager requestWithObject:object method:method path:path parameters:parameters];
[objectManager managedObjectRequestOperationWithRequest:request managedObjectContext:mainManagedObjectContext success:^{ 
    NSLog(@"blah");
}];

现在发生这种情况之后，RestKit开始运行操作对象，这些操作对象最终会调用save，这会对此调用起作用

-(void)handleManagedObjectContextDidSaveNotification:(NSNotification *)notification {
...
    [self.mergeContext mergeChangesFromContextDidSaveNotification:notification];
...

这是我的KVO观察员代码向我发出的信号，我做了一个改变

object.oneToOneRelationShip == nil

我相信我通过在发布对象之前保存到持久性存储来解决我的问题，但有人可以向我解释为什么会发生这种情况。难道我做错了什么？这个bug对我来说很混乱。我在主要背景下创建对象，所以我不知道这个问题是如何发生的。