objectIDs(forRelationshipNamed:)
Returns the object IDs for all of the managed objects that are in the named relationship.
Declaration
func objectIDs(forRelationshipNamed key: String) -> [NSManagedObjectID]Returns the object IDs for all of the managed objects that are in the named relationship.
func objectIDs(forRelationshipNamed key: String) -> [NSManagedObjectID]