Missing argument for parameter 'from' in call - SwiftUI - ios

Question

I'm building a SwiftUI app that retrieves an array of movies by genre from The Movie Database API.
Once the user selects a movie, I make a second API to get details for that specific movie. I'm using #Published to notify the view of changes however I am getting the I get the error "Missing argument for parameter 'from' in call" whenever I call an instance of the Model.
Here's the Model:
import Foundation
// MARK: - MovieList
struct MovieList: Codable {
let page: Int
let totalResults: Int
let totalPages: Int
let movie: [Movie]
enum CodingKeys: String, CodingKey {
case page
case totalResults = "total_results"
case totalPages = "total_pages"
case movie = "results"
}
}
// MARK: - Movie
struct Movie: Codable {
let popularity: Double
let voteCount: Int
let video: Bool
let posterPath: String?
let id: Int
let adult: Bool
let backdropPath: String?
let title: String
let voteAverage: Double
let overview: String
let releaseDate: String?
let runTime: Int?
enum CodingKeys: String, CodingKey {
case popularity
case voteCount = "vote_count"
case video
case posterPath = "poster_path"
case id, adult
case backdropPath = "backdrop_path"
case title
case voteAverage = "vote_average"
case overview
case releaseDate = "release_date"
case runTime = "runtime"
}
}
And here's the View Model:
import Foundation
class DetailViewModel: ObservableObject {
#Published var fetchedMovie = Movie() // getting error here
func getMovieDetails(id: Int) {
WebService().getMovieDetails(movie: id) { movie in
if let movieDetails = movie {
self.fetchedMovie = movieDetails
}
}
}
}
And here's the network call:
func getMovieDetails(movie: Int, completion: #escaping (Movie?) -> ()) {
guard let url = URL(string: "https://api.themoviedb.org/3/movie/\(movie)?api_key=5228bff935f7bd2b18c04fc3633828c0") else {
fatalError("Invalid URL")
}
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
let task = session.dataTask(with: url) { data, response, error in
// Check for errors
guard error == nil else {
print ("error: \(error!)")
return
}
// Check that data has been returned
guard let data = data else {
print("No data")
return
}
do {
let decoder = JSONDecoder()
let movieDetails = try decoder.decode(Movie.self, from: data)
DispatchQueue.main.async {
completion(movieDetails)
}
} catch let err {
print("Err", err)
}
}
// execute the HTTP request
task.resume()
}
}
And the View code:
import SwiftUI
struct MovieDetailView: View {
#ObservedObject private var detailVM = DetailViewModel() // error here: Missing argument for parameter 'movie' in call
var movie: DetailViewModel
var body: some View {
VStack {
URLImage(url: "\(movie.backdropURL)")
.aspectRatio(contentMode: .fit)
Text("\(detailVM.movieRunTime) mins")
Text(movie.movieOverview)
.padding()
Spacer()
}.onAppear {
self.detailVM.getMovieDetails(id: self.movie.id)
}
.navigationBarTitle(movie.movieTitle)
}
}
struct MovieDetailView_Previews: PreviewProvider {
static var previews: some View {
MovieDetailView(movie: DetailViewModel(movie: Movie.example))
}
}
Any help would be greatly appreciated.

Answer 1

You cant initialise Movie object like this ... it needs Decoder object or all member wise intialization ---
You can define your function like this
class DetailViewModel: ObservableObject {
#Published var fetchedMovie : Movie?
func getMovieDetails(id: Int) {
WebService().getMovieDetails(movie: id) { movie in
if let movieDetails = movie {
self.fetchedMovie = movieDetails
}
}
}
}