Creating a copy of attribute value of NSManagedObject

Question

I need to create a copy/save/duplicate of listID attribute of NSManagedObject list. The scenario is first delete list from local store and then i send request to server for deleting list objects using their id but when i delete objects from local store there i cannot then access object ids. Following is the code

List *list = (List*)[self.fetchedResultsController objectAtIndexPath:indexPath];

NSString *listID = [list.listID stringValue];
[listsToDelete addObject:listID];

[context deleteObject:[self.fetchedResultsController objectAtIndexPath:indexPath]];

i tried to store object id string value in an array for later use but no avail because if at later i access listToDelete it is nil. Why do i need to do to achieve this?

Answer 1

Based on the limited code you have shown, a few things come to mind:

1) Did you initialize your listsToDelete? I imagine that is an NSMutableArray type. You need to initialize it properly.

IE. NSMutableArray* listsToDelete = [[NSMutableArray alloc] init];

2) Have you tried logging the value of list.listID prior to adding it into your array? Maybe the value was nil to begin with?