CoreData - how to save data correctly?

Question

Objective-C

Good day, there was a problem when saving data, from the beginning:
There is JSON: (Data about the user - the name of the entity "Client")

{
    "area_residence" = "\U041a\U0438\U0435\U0432";
    "b_day" = "1991-12-29";
    comment = "";
    email = "[email protected]";
    gender = 1;
    id = 4142;
    "last_visit" = "2014-06-11 15:30:21";
    marital = 0;
    name = "\U0410\U043b\U0435\U043a\U0441\U0430\U043d\U0434\U0440";
}

I save data:

for (NSDictionary *dictionary in data) {
        NSManagedObject *managedObject = [NSEntityDescription insertNewObjectForEntityForName:@"Client" inManagedObjectContext:managedObjectContext];

        for (NSString *key in [dictionary allKeys]) {
            if ([managedObject respondsToSelector:NSSelectorFromString(key)]) {
                if (!) {
                    [managedObject setValue:[dictionary objectForKey:key] forKey:key];
                }
            }
        }

        [managedObjectContext insertObject:managedObject];
    }

    [managedObjectContext save:&error];

Saving is successful, but the task has not changed much, and now you need to store in the Client entity and the user's nationality, which looks like:

nationality =     {
        id = 216;
        ar = Ukraine;
        de = Ukraine;
         en = Ukraine;
         fr = Ukraine;
         ru = "\U0423\U043a\U0440\U0430\U0438\U043d\U0430";
         ua = "\U0423\U043a\U0440\U0430\U0438\U043d\U0430";
    };

JSON in full:

{
    "area_residence" = "\U041a\U0438\U0435\U0432";
    "b_day" = "1991-12-29";
    comment = "";
    email = "a[email protected]";
    gender = 1;
    id = 4142;
    "last_visit" = "2014-06-11 15:30:21";
    marital = 0;
    name = "\U0410\U043b\U0435\U043a\U0441\U0430\U043d\U0434\U0440";
    nationality =     {
        id = 216;
        ar = Ukraine;
        de = Ukraine;
         en = Ukraine;
         fr = Ukraine;
         ru = "\U0423\U043a\U0440\U0430\U0438\U043d\U0430";
         ua = "\U0423\U043a\U0440\U0430\U0438\U043d\U0430";
        };
    }

And so the entity "Client":

The entity "Nationality":

General screen:

When I restart, I get an error:

2014-06-15 15:26:50.092 CoreDataEntity[3444:60b] -[__NSCFDictionary managedObjectContext]: unrecognized selector sent to instance 0x8d77720
2014-06-15 15:26:50.094 CoreDataEntity[3444:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary managedObjectContext]: unrecognized selector sent to instance 0x8d77720'

Apparently, the object cannot be written to 'NSManagedObject':

[managedObject setValue:[dictionary objectForKey:key] forKey:key];

How then can you proceed so that you can quickly and painlessly record data? Thank you in advance!

Answer 1

well, you set the dictionary in the relationship. set the condition not to check that this is a relationship, write the second loop and set the field values

Answer 2

- (void)parseData:(NSArray*)data
{
    for (NSDictionary *clientDictionary in data) {
        
        NSManagedObject *managedObject = [NSEntityDescription insertNewObjectForEntityForName:@"Client" inManagedObjectContext:managedObjectContext];
        //Вытаскиваете нужное нужное значение, добавляете его в объект
        ...
        [managedObject setValue:simpleValue forKey:key];

        NSDictionary* dictNational = [clientDictionary  objectForKey:@"nationality"];
        NSManagedObject *natObject = [NSEntityDescription insertNewObjectForEntityForName:@"nationality" inManagedObjectContext:managedObjectContext];
        //Аналогично парсите dictNational в natObject
       ...
       [natObject setValue:simpleValue forKey:key];

       [managedObject setValue: natObject forKey:@"nationality"];
    }
    [managedObjectContext save:&error];
}

Answer 3

https://vk.com/videos-58860049?z=video-58860049_16...