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class HNStoriesFeed : ObservableObject{ | |
@Published var storyItems = [StoryItem]() | |
var urlBase = "https://hacker-news.firebaseio.com/v0/topstories.json?print=pretty" | |
var cancellable : Set<AnyCancellable> = Set() | |
private var topStoryIds = [Int]() { | |
didSet { | |
fetchStoryById(ids: topStoryIds.prefix(10)) | |
} | |
} | |
init() { | |
fetchTopStories() | |
} | |
func fetchStoryById<S>(ids: S) where S: Sequence, S.Element == Int{ | |
Publishers.MergeMany(ids.map{FetchItem(id: $0)}) | |
.collect() | |
.receive(on: DispatchQueue.main) | |
.sink(receiveCompletion: { | |
if case let .failure(error) = $0 { | |
print(error) | |
} | |
}, receiveValue: { | |
self.storyItems = self.storyItems + $0 | |
}) | |
.store(in: &cancellable) | |
} | |
func fetchTopStories(){ | |
URLSession.shared.dataTaskPublisher(for: URL(string: "\(urlBase)")!) | |
.map{$0.data} | |
.decode(type: [Int].self, decoder: JSONDecoder()) | |
.sink(receiveCompletion: { completion in | |
switch completion { | |
case .failure(let error): | |
print("Something went wrong: \(error)") | |
case .finished: | |
print("Received Completion") | |
} | |
}, receiveValue: { value in | |
self.topStoryIds = value | |
}) | |
.store(in: &cancellable) | |
} | |
} |
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