How to select specific data in Core Data?

Question

I have a sample program that use Core Data and load an sqlite database in it. And I am displaying all the values using this code

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Name"
                                          inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];

for (Name *name in fetchedObjects) {
    NSLog(@"ID: %@", name.nameId);
    NSLog(@"First Name: %@", name.first);
    NSLog(@"Middle Name: %@", name.middle);
    NSLog(@"Last Name: %@", name.last);
}

This code works fine, my problem here is that I can't select a specific data/record. Example I want to select the record with the ID = 1.

Thanks!

Answer 1

You have to use predicates (with NSPredicate) before your request execution.

Something like that :

NSPredicate *predicateID = [NSPredicate predicateWithFormat:@"nameID == %d",-1];
[fetchRequest setPredicate:predicateID];