Save a CoreData object in a specific NSPersistentStore

I've the following problem:

I have two or more persistent stores. And I have created an entity in the xcdatamodel named "House". Now I have these two files for the NSManagedObject House.

Now I want to know how do I save an instance of the entity house in a specific persistent store?

So I t开发者_如何学Pythonried to work with [NSEntityDescription insertNewObjectForName:@"House" inManagedObjectContext:context] and [context assignObject: toPersistentStore:]. But it didn't worked until now. Am I on the right way to do it?

Can somebody give me a hint?

Answering my own question:

The problem was that I allocated a completely new persistentStoreCoordinate who coordinates all the stores. So the coordinator wasn't linked to the managedObjectContext.

Could be solved with

__persistentStoreCoordinator = [__managedObjectContext persistentStoreCoordinator];