Footnote Incomplete Persons

In a non-EOF system you might be tempted to add a state method to your fetched objects, so that the application programmer knows if an object is incomplete.

@interface Person : NSObject
{
   BOOL             relativesWereFetchedFromDatabase;
   NSMutableArray   *relatives_;
}

- (BOOL) relativesWereFetchedFromDatabase;
- (NSArray *) relatives;
- (void) addToRelatives:(Person *) other;
- (void) removeFromRelatives:(Person *) other;