Multiple NSURLSession dependent download tasks - swift

Question

I wanted to learn some NSURLSession basics and I was wondering how to handle multiple requests from an API. Like if you ask for a user resource on Github's api, it has an avatar_url, and then wanted to use that avatar_url to make another request. I have this so far:
let reposEndpoint = URL(string: "users/crystaltwix", relativeTo: baseURL)
var reposRequest = URLRequest(url: reposEndpoint!)
reposRequest.allHTTPHeaderFields = [
"accept": "application/vnd.github.v3+json",
"content-type": "application/json"
]
session?.dataTask(with: reposRequest) { data, response, error in
guard let response = response, let data = data else {
print("something went wrong")
return
}
print("response: \(response)")
// print("data: \(data)")
let decoder = JSONDecoder()
do {
let user = try decoder.decode(User.self, from: data)
print(user)
// avatar URL
let avatarURL = URL(string: user.avatarURL)
let avatarEndpoint = URLRequest(url: avatarURL!)
self.session?.dataTask(with: avatarEndpoint) { data, response, error in
guard let response = response, let data = data else {
print("something went wrong inner")
return
}
let avatarImage = UIImage(data: data)
let userModel = UserModel(login: user.login, avatar: avatarImage!, name: user.name, bio: user.bio)
}
} catch let error {
print("Error: \(error.localizedDescription)")
print(error)
completion(nil, nil, error)
}
}.resume()
struct User: Codable {
let login: String
let avatarURL: String
let name: String
let bio: String
private enum CodingKeys: String, CodingKey {
case login
case avatarURL = "avatar_url"
case name
case bio
}
}
So the first request to the user works and I make my URLRequest with the user.avatarURL fine, but then in the next
self.session?.dataTask(with: avatarEndpoint) { // nothing happens here }
No request is made there. What's the best way to handle this scenario?

Answer 1

I see your code, i think you forgot to call resume method in second request.
self.session?.dataTask(with: avatarEndpoint) { data, response, error in
guard let response = response, let data = data else {
print("something went wrong inner")
return
}
let avatarImage = UIImage(data: data)
let userModel = UserModel(login: user.login, avatar: avatarImage!, name: user.name, bio: user.bio)
}.resume()
resume method means start requesting.