CODEWITHSUNDEEP
xcodecore-dataadditionrecord
Recycled Steel
Recycled Steel

Reputation: 2272

Core Data, adding multiple items to Entity in same instance

My code sets up it's Entity, Context etc and then saves a record, that all works fine. Then I want to save a NEW record but the code overwrites the original record.

How can I write more than one item in the same instance?

AppDelegate *appdelagate = [[UIApplication sharedApplication]delegate];
context = [appdelagate managedObjectContext];
NSEntityDescription *entitydesc = [NSEntityDescription entityForName:@"UserData" inManagedObjectContext:context];
NSManagedObject *userData = [[NSManagedObject alloc]initWithEntity:entitydesc insertIntoManagedObjectContext:context];
            [userData setValue:@"Bob" forKey:@"userCD"];
            [userData setValue:@"Tall" forKey:@"dataCD"];
            // Store in the DB
            [context save:&error];

SOME HOW MOVE TO NEXT RECORD

    [userData setValue:@"John" forKey:@"userCD"];
    [userData setValue:@"Short" forKey:@"dataCD"];
    // Store in the DB
    [context save:&error];

I am thinking I need to release the userData and declare again... I am also thinking I am missing a great deal and should stop thinking in terms of SQL.

Thanks

Upvotes: 0

Views: 2371

Answers (1)

Martin R
Martin R

Reputation: 539745

That is because you change the attributes of the first userData object instead of creating a new one:

NSManagedObject *userData;
// Create first object:
userData = [[NSManagedObject alloc]initWithEntity:entitydesc insertIntoManagedObjectContext:context];
[userData setValue:@"Bob" forKey:@"userCD"];
[userData setValue:@"Tall" forKey:@"dataCD"];
[context save:&error];
// [userData release];  only if you don't compile with ARC

// Create second object:
userData = [[NSManagedObject alloc]initWithEntity:entitydesc insertIntoManagedObjectContext:context];
[userData setValue:@"John" forKey:@"userCD"];
[userData setValue:@"Short" forKey:@"dataCD"];
[context save:&error];
// [userData release];  only if you don't compile with ARC

Upvotes: 2

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