decoding a [String: Int] dictionary from JSON - json

Question

Using the quicktype.io I reflected the following JSON...
{
"message": "The data were fetched successfully.",
"data": {
"date": "2022-07-22",
"day": 149,
"resource": "https://www.someWebsite.com",
"stats": {
"personnel_units": 39000,
"tanks": 1704,
"armoured_fighting_vehicles": 3920,
"artillery_systems": 863,
"mlrs": 251,
"aa_warfare_systems": 113,
"planes": 221,
"helicopters": 188,
"vehicles_fuel_tanks": 2803,
"warships_cutters": 15,
"cruise_missiles": 167,
"uav_systems": 713,
"special_military_equip": 72,
"atgm_srbm_systems": 4
},
"increase": {
"personnel_units": 150,
"tanks": 0,
"armoured_fighting_vehicles": 8,
"artillery_systems": 4,
"mlrs": 0,
"aa_warfare_systems": 0,
"planes": 0,
"helicopters": 0,
"vehicles_fuel_tanks": 22,
"warships_cutters": 0,
"cruise_missiles": 0,
"uav_systems": 3,
"special_military_equip": 0,
"atgm_srbm_systems": 0
}
}
}
into the classic Swift struct ...
struct DataModel: Codable {
var message: String
var data: ObjectsModel
}
struct ObjectsModel: Codable {
var date: String
var day: Int
var resource: String
var stats, increase: [String: Int]
}
My issue is about stats and increase properties.
I simply cannot find a way to either set the CodingKeys for the keys that come in those properties or set the decoding strategy to convert them to CamelCase.
Calling decoder.keyDecodingStrategy = .convertFromSnakeCase doesn't seem to work and the keys are still displayed in SnakeCase...

Answer 1

As much as I understand, you need a new struct for both stats and increase, or it would be a better approach.
struct DictionaryItem: Codable {
let personnelUnits: Int
let tanks: Int
let armouredFightingVehicles: Int
enum CodingKeys: String, CodingKey {
case personnelUnits = "personnel_units"
case tanks
...
}
That way you can use it defining increases and stats as DictionaryItem