Just completed the section on Dynamic Filtering, which works fine. The 'Add' button keeps adding the same records. Mistakenly, I was under the impression that the SceneDelegate code:

let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy

avoids writing duplicate data. Obvioulsy, it only merges what is in the cache, before saving. Anyone have some ready made code that validates additions against the DB first? Regards.

I tried to find the lesson in 100 Days of SwiftUI and wasn't able to find it. Could you please give me a link or the code snippet which adds the object? Because I doubt it's the same object but it's everytime a new instance of the object with the same property values.

Have you seen these articles here: https://www.hackingwithswift.com/books/ios-swiftui/ensuring-core-data-objects-are-unique-using-constraints https://www.hackingwithswift.com/read/38/6/how-to-make-a-core-data-attribute-unique-using-constraints

Thank you Hatsushira.