How should I add items to a list in Core Data now that xcode 4 changed the generated code?

I have a core data model with a parent item and child items under it. In Xcode 3, when I generated the NSManagedObjects for this, I had methods called addChildsObject object method on Parent, but this has gone away in Xcode 4 (see Xcode4: Different code generated for custom core data managed objects). My question is this: how should I be adding the children to the parent now? I reall开发者_开发问答y don't want to mess with the generated code, revert to using Xcode3, or add a category to Parent to bring back the missing methods. Is there an approved way, or did Apple just muck up the whole process?

After discovering and reviewing the documentation on Dynamically-Generated Accessor Methods, it appears that Apple still recommends using the now non-existent methods, so it would appear that they have just screwed up by removing them. There is, however, another recommended way of doing this:

NSMutableSet *children = [parent mutableSetValueForKey:@"child"];
[children addObject: child1];
[children removeObject: child2];

This is not fabulous, because it relies on an unchecked string name, but it's the only remaining recommended way to do this without custom implementations. Thanks a lot Apple!