Learning Core Data for iOS: A Hands-On Guide to Building Core Data Applications

Deleting Managed Objects

Deleting a managed object is as easy as calling deleteObject or deleteObjects on a containing context. Note that the deletion isn’t permanent until you also call save: on the context. The code involved is shown in Listing 2.9.

Listing 2.9 AppDelegate: demo (Deleting)

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NSFetchRequest *request =[NSFetchRequest fetchRequestWithEntityName:@"Item"];NSArray *fetchedObjects =[_coreDataHelper.context executeFetchRequest:request error:nil];for (Item *item in fetchedObjects) {    NSLog(@"Deleting Object '%@'", item.name);    [_coreDataHelper.context deleteObject:item];}

Update Grocery Dude as follows to delete all the objects:

1. Replace all code in the demo method with the code from Listing 2.9 ...