swift-codable-hash.swift

import Foundation

enum Gender : String, Codable {
  case M, F
}
struct User : Codable {
    let name: String
    let email: String
    let gender: Gender
    let verified: Bool
    let age: Int
}
struct Group : Codable {
  let subject: String
  let deleted: Bool
  let users: [String: User]
}
let dataString = """
{
  "subject": "Sports",
  "deleted":  false,
  "users": {
    "483b06db3118831bfffd7b4c": {
      "name": "john",
      "email": "john@gmail.com",
      "gender": "M",
      "verified": true,
      "age": 22
    },
    "b1078c872c79d0da818fc968": {
      "name": "mary",
      "email": "mary@gmail.com",
      "gender": "F",
      "verified": false,
      "age": 23
    }
  }
}
"""

let data : Data? = dataString.data(using: .utf8)
let decoder = JSONDecoder()

let response = try decoder.decode(Group.self, from: data!)
print(response)