Установка отношений при импорте базовых данных?

If the Department objects have already been saved to a persistent store, then you can bring them into another managed object context. Since your objects will all have to live in the same persistent store anyway (as cross-store relationships are not allowed), you should be able to simply fetch the ones you need into importMoc.

For example:

foreach (NSDictionary *record in employeeRecords) {
    NSManagedObject *employee = [NSEntityDescription insertNewObjectForEntityForName:@"Employee" inManagedObjectContext:importMoc];
    // Configure employee however you do that

    NSString *managerID = [record objectForKey:@"someKeyThatUniquelyIdentifiesTheManager"];
    NSFetchRequest *managerFetchRequest = [[NSFetchRequest alloc] init];
    [managerFetchRequest setEntity:[NSEntity entityForName:@"Manager" inManagedObjectContext:importMoc]];
    [managerFetchRequest setPredicate:[NSPredicate predicateWithFormat:@"managerProperty == %@", managerID]];
    NSArray *managers = [importMoc executeFetchRequest:managerFetchRequest error:nil]; // Don't be stupid like me and catch the error ;-)
    [managerFetchRequest release];

    if ([managers count] != 1) {
        // You probably have problems if this happens
    }

    [employee setValue:[managers objectAtIndex:0] forKey:@"manager"];
}

You could also just do a single fetch request to get all of the managers into importMoc and then filter that array to locate the right one each time. That would probably be a lot more efficient. In other words, don't do what I just told you to do above :-)

1 / предположим, что запись X сотрудника имеет имя Y и идентификатор отдела 15 (т.е. она ссылается на отдел с идентификатором 15 через отношение)

2 / загрузить отдел с идентификатором отдела 15 из управляемого объекта context

3 / создать сотрудника, который ссылается на объект, созданный в (2)

, т.е. (примечание: только пример кода, вероятно, не будет компилироваться):

NSEntityDescription * departmentED = [NSEntityDescription entityForName:@"Department" inManagedObjectContext:moc];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(id == %@)", deptId];

NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:departmentED];
[request setPredicate:predicate];

NSError *error = nil;
NSArray *array = [moc executeFetchRequest:request error:&error];

/* create employee */

NSEntityDescription * employeeED = [NSEntityDescription entityForName:@"Employee" inManagedObjectContext:moc];
NSManagedObject * employeeMO = [[[NSManagedObject alloc] initWithEntity:employeeED insertIntoManagedObjectContext:moc] autorelease];

/* set employee department to department instance loaded above */
[receiptObject setValue:[array objectAtIndex:0] forKey:@"department"];