ugh

shit.swift

    func fetchOrder(type: FeedType) {
        DispatchQueue.global(qos: .userInitiated).async {
            let context = PersistenceController.shared.container.newBackgroundContext()

            self.orderCancellable = self.ref.child(type.hackerNewsEndpoint).observeSingleEventPublisher(of: .value)
                .compactMap {
                    $0.value as? [Int]
                }
                .flatMap { orders -> Publishers.Sequence<[Int], Never> in
                    
                    // this may be a bad idea
                    DispatchQueue.main.async {
                        self.order = orders
                    }
                    
                    return orders.publisher
                }
                .flatMap { id in
                    self.ref.child("item").child(String(id)).observeSingleEventPublisher(of: .value)
                }
                .compactMap {
                    $0.value as? NSDictionary
                }
                .map {
                    processItemDict($0, context: context)
                }
                .sink(receiveCompletion: { completion in
                    switch completion {
                    case .finished:
                        do {
                            try context.save()
                        } catch {
                            print(error)
                        }
                    case .failure(let error):
                        print(error)
                    }
                }) { _ in
                    // values come out of this end, though they don't really need to
                }
        }
    }