Use onChange on FetchedResults/@FetchRequest variable or get notified when the variable changes

 

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    @FetchRequest(
        entity: Book.entity(),
        sortDescriptors: [NSSortDescriptor(keyPath: \Book.entity.date, ascending: true)]
    ) var books: FetchedResults<Book.entity>

.onRecevie(books.publisher){ _ in
      ....
}