gistfile1.m

    [theCreatingMOC performBlockAndWait:^{

        // Insert some test data...
        NSManagedObject *thePerson = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:theCreatingMOC];
        [thePerson setValue:@"Steve Jobs" forKey:@"name"];
        
        NSManagedObject *theCompany = [NSEntityDescription insertNewObjectForEntityForName:@"Company" inManagedObjectContext:theCreatingMOC];
        [theCompany setValue:@"Apple" forKey:@"name"];

        [theCompany setValue:[NSSet setWithObject:thePerson] forKey:@"employees"];

		NSError *thePermanentIDError = nil;
		[theCreatingMOC obtainPermanentIDsForObjects:[NSArray arrayWithObject:theCompany] error:&thePermanentIDError];
		NSLog(@"Permanent ID error: %@", thePermanentIDError);
		
        // And save it...
        NSError *theError = NULL;
        [theChildMOC save:&theError];
        NSLog(@"MOC Saved (%@)", theError);
        
        // Store a object URL so we can do our magic in whatever MOC we want...
        theCompanyURL = theCompany.objectID.URIRepresentation;
        NSLog(@"%@", theCompanyURL);
        }];