现在xcode 4改变了生成的代码，我应该如何将项目添加到Core Data中的列表？

Question

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 really 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?

Answer 1

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!