Decoding JSON array of different types in Swift

Question

I\'m trying to decode the following JSON Object

{
    \"result\":[
             {
             \"rank\":12,
             \"user\":{ 
                     \"n         


        

Answer 1

Just for fun:

First you need structs for the users and the representation of the first and second dictionary in the result array. The key "1" is mapped to one

struct User : Decodable {
    let name : String
    let age : Int
}

struct FirstDictionary : Decodable {
    let rank : Int
    let user : User
}

struct SecondDictionary : Decodable {
    let one : [User]

    private enum CodingKeys: String, CodingKey { case one = "1" }
}

---

Now comes the tricky part:

• First get the root container.
• Get the container for result as nestedUnkeyedContainer because the object is an array.
• Decode the first dictionary and copy the values.

• Decode the second dictionary and copy the values.

  struct UserData: Decodable {
  
      let rank : Int
      let user : User
      let oneUsers : [User]
  
     private enum CodingKeys: String, CodingKey { case result }
  
      init(from decoder: Decoder) throws {
          let container = try decoder.container(keyedBy: CodingKeys.self)
          var arrayContainer = try container.nestedUnkeyedContainer(forKey: .result)
          let firstDictionary = try arrayContainer.decode(FirstDictionary.self)
          rank = firstDictionary.rank
          user = firstDictionary.user
          let secondDictionary = try arrayContainer.decode(SecondDictionary.self)
          oneUsers = secondDictionary.one
      }
  }
  

If this code is preferable over traditional manual JSONSerialization is another question.