Thank you! Literally the only answer on the internet! Is that change documented anywhere? I watched the SwiftData WWDC videos and didn't notice them mention that, but maybe I missed it. Also, could you please give a simple example of what you mean by "set that optional attribute to explicitly point to the data model that will contain the area you 'many' items"? It sounds like there needs to also be a property on the child object pointing to the parent, but I'm not sure how to do that properly.