CODEWITHSUNDEEP
ioscore-data
Sgillon
Sgillon

Reputation: 147

Core Data Relationship - Add to existing value

I am trying to set a relationship between inputted core data values. I currently have it set up so when I add the value it creates the relationship in the corresponding entity which I can view in a detail view.

What I am trying to achieve is to add the relationship to a existing value within the entity that is held in a string RoutineText. So instead of creating a second identical entry the relationship is added to the new entry. So in the detail view both entries will be viewable.

The current situation when inputing the values The current situation when inputing the values

So instead of it creating:

TestName1 ----> TestName1Detail

TestName1 ----> TestName2Detail

it would create:

TestName1 ----> TestName1Detail + TestName2Detail

   NSManagedObjectContext *context = [self managedObjectContext];

    // Create a new device
    ExcerciseInfo *info = [_fetchedResultsController objectAtIndexPath:indexPath];
    Routines  *routineEntity = [NSEntityDescription insertNewObjectForEntityForName:@"Routines"inManagedObjectContext:context];

    RoutinesDetails *routineEntityDetail = [NSEntityDescription insertNewObjectForEntityForName:@"RoutinesDetails" inManagedObjectContext:context];

    //Create Relationship
    [routineEntity addRoutinedetObject:routineEntityDetail];

    //Add attribute values
    //[routineEntity setValue: RoutineText  forKey:@"routinename"];
    [routineEntityDetail setValue: info.name  forKey:@"image"];

    NSError *error = nil;

    // Save the object to persistent store
    if (![context save:&error]) {
        NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
    }

I hope that is clear. enter image description here

Upvotes: 0

Views: 655

Answers (1)

Jim
Jim

Reputation: 73936

Of course it's acting this way - you're creating a new Routines object:

Routines  *routineEntity = [NSEntityDescription insertNewObjectForEntityForName:@"Routines"inManagedObjectContext:context];

If you want to associate a new RoutinesDetails object with an existing Routines object, you don't create a new Routines object, you use the one you already have.

Given that the preceding comment explicitly states a new object is being created, and that it refers to a completely different object, I'm guessing you've copied and pasted this code instead of writing it. I suggest going through the tutorials instead of trying to make somebody else's code work without understanding what is going on.

Upvotes: 1

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