I'm trying to fetch the top playlists from Apple Music using the charts API and I have the following code:
func fetchPopularPlaylists() async throws -> [MusicItemCollection<Playlist>] {
var request = URLRequest(url: URL(string: "https://api.music.apple.com/v1/catalog/US/charts?types=playlists")!)
let userToken = try await fetchUserToken()
request.httpMethod = "GET"
request.addValue("Bearer \(Self.jwt)", forHTTPHeaderField: "Authorization")
request.addValue(userToken, forHTTPHeaderField: "Music-User-Token")
let dataRequest = MusicDataRequest(urlRequest: request)
let response = try await dataRequest.response()
let decoder = JSONDecoder()
let playlistResponse = try decoder.decode(MyChartsResponse.self, from: response.data)
return playlistResponse.results.playlists
}
And this code works well and as expected, I'm able to populate results. However, I believe that the response is getting decoded incorrectly.
My response model object:
struct MyChartsResponse: Codable {
struct Results: Codable {
let playlists: [MusicItemCollection<Playlist>]
}
let results: Results
}
The charts api however has the response listed in the form of:
{
"results": {
"playlists": [
// playlist entities here
]
}
}
This API response makes it seem like the proper Swift decoding structure is either
struct MyChartsResponse: Codable {
struct Results: Codable {
let playlists: MusicItemCollection<Playlist>
}
let results: Results
}
or
struct MyChartsResponse: Codable {
struct Results: Codable {
let playlists: [Playlist]
}
let results: Results
}
but instead the playlist property has to be Array<MusicItemCollection<Playlist>> in order to decode correctly with no custom decoding. The playlists property is incorrectly getting wrapped in an extraneous collection on decoding which makes extracting it difficult.