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")
  8. var features: [Landmark] {
  9. landmarks.filter { $0.isFeatured }
  10. }
  12. var categories: [String: [Landmark]] {
  13. Dictionary(
  14. grouping: landmarks,
  15. by: { $0.category.rawValue }
  16. )
  17. }
  18. }
  20. func load<T: Decodable>(_ filename: String) -> T {
  21. let data: Data
  23. guard let file = Bundle.main.url(forResource: filename, withExtension: nil)
  24. else {
  25. fatalError("Couldn't find \(filename) in main bundle.")
  26. }
  28. do {
  29. data = try Data(contentsOf: file)
  30. } catch {
  31. fatalError("Couldn't load \(filename) from main bundle:\n\(error)")
  32. }
  34. do {
  35. let decoder = JSONDecoder()
  36. return try decoder.decode(T.self, from: data)
  37. } catch {
  38. fatalError("Couldn't parse \(filename) as \(T.self):\n\(error)")
  39. }
  40. }