How to update FetchRequest with predicate in SwiftUI

Issue #621

Make subview that accepts FetchRequest. Trigger search by setting property

struct SideView: View {
    @Environment(\.managedObjectContext)
    var context

    @State var search: Search?

    var body: some View {
        VStack(alignment: .leading) {
            SearchView(
                onSearch: self.onSearch
            )
            InsideListView(fetchRequest: makeFetchRequest())
        }
    }

    private func makeFetchRequest() -> FetchRequest<Book> {
        let predicate: NSPredicate?
        if let search = search {
            let textPredicate = NSPredicate(format: "string CONTAINS[cd] %@", search.text)
            let appPredicate = NSPredicate(format: "appName == %@", search.app)
            let typePredicate = NSPredicate(format: "type == %@", search.type)

            var predicates: [NSPredicate] = []
            if search.text.count >= 3 {
                predicates.append(textPredicate)
            }

            if search.app != Constants.all {
                predicates.append(appPredicate)
            }

            if search.type != Constants.all {
                predicates.append(typePredicate)
            }

            predicate = NSCompoundPredicate(andPredicateWithSubpredicates: predicates)
        } else {
            predicate = nil
        }

        return FetchRequest<Book>(
            entity: Book.entity(),
            sortDescriptors: [
                NSSortDescriptor(keyPath: \Book.date, ascending: false)
            ],
            predicate: predicate
        )
    }

    private func onSearch(_ search: Search) {
        if search.text.count < 3 && search.type != Constants.all && search.app != Constants.all {
            self.search = nil
        } else {
            self.search = search
        }
    }
}

private struct InsideListView: View {
    @Environment(\.managedObjectContext)
    var context

    var fetchRequest: FetchRequest<Book>

    var body: some View {
        List(items) {
            ForEach
       }
    }

    private var items: FetchedResults<Book> {
        fetchRequest.wrappedValue
    }
}