ModelData.swift


  1. import Foundation
  2. import Combine
  4. final class ModelData: ObservableObject {
  5. @Published var landmarks: [Landmark] = load("landmarkData.json")
  6. var hikes: [Hike] = load("hikeData.json")
  7. @Published var profile = Profile.default
  9. var features: [Landmark] {
  10. landmarks.filter { $0.isFeatured }
  11. }
  13. var categories: [String: [Landmark]] {
  14. Dictionary(
  15. grouping: landmarks,
  16. by: { $0.category.rawValue }
  17. )
  18. }
  19. }
  21. func load<T: Decodable>(_ filename: String) -> T {
  22. let data: Data
  24. guard let file = Bundle.main.url(forResource: filename, withExtension: nil)
  25. else {
  26. fatalError("Couldn't find \(filename) in main bundle.")
  27. }
  29. do {
  30. data = try Data(contentsOf: file)
  31. } catch {
  32. fatalError("Couldn't load \(filename) from main bundle:\n\(error)")
  33. }
  35. do {
  36. let decoder = JSONDecoder()
  37. return try decoder.decode(T.self, from: data)
  38. } catch {
  39. fatalError("Couldn't parse \(filename) as \(T.self):\n\(error)")
  40. }
  41. }