Parsing Nested JSON in SWIFT 4

Question

I am currently parsing JSON with Decodable in SWIFT 4.

The JSON is formatted as follows:

  {
  "autopayout_from": "1.010",
  "earning_24_hours": "9.74731104",
  "error": false,
  "immature_earning": 0.635593030875,
  "last_payment_amount": "1.91238210",
  "last_payment_date": "Mon, 26 Feb 2018 15:08:02 GMT",
  "last_share_date": "Mon, 26 Feb 2018 16:16:01 GMT",
  "payout_daily": false,
  "payout_request": false,
  "total_hashrate": 109006.86,
  "total_hashrate_calculated": 143855.75,
  "transferring_to_balance": 0.2281390807,
  "wallet": "0xbb76fc2ce36a19da28fd713e350a42f1023e2f7f",
  "wallet_balance": "0.49556201",
  "workers": {
    "10003": {
      "alive": false,
      "hashrate": 0.0,
      "hashrate_below_threshold": false,
      "hashrate_calculated": 0.0,
      "last_submit": "Mon, 26 Feb 2018 13:23:16 GMT",
      "second_since_submit": 10612,
      "worker": "10003"
    },
    "100151": {
      "alive": false,
      "hashrate": 0.0,
      "hashrate_below_threshold": false,
      "hashrate_calculated": 0.0,
      "last_submit": "Mon, 26 Feb 2018 09:30:30 GMT",
      "second_since_submit": 24578,
      "worker": "100151"
    },
    "100205": {
      "alive": true,
      "hashrate": 19.28,
      "hashrate_below_threshold": true,
      "hashrate_calculated": 24.85,
      "last_submit": "Mon, 26 Feb 2018 16:12:02 GMT",
      "second_since_submit": 486,
      "worker": "100205"
    },

I am able to easily parse things such as last_payment_ammount or last_payment_date with my Struct:

struct ticker: Codable{
    let error: Bool
    let wallet: String
    let earning_24_hours: String
    let immature_earning: Double
    let last_payment_amount: String
    let last_payment_date: String
    let total_hashrate: Double
    let total_hashrate_calculated: Double
    let wallet_balance: String
}

What I am really struggling to get my head around is getting the nested stuff.

How can I get for example a list of workers using the "worker" variable for example to maybe put into an array. Or parse the hashrate value for one worker?

Many thanks

Does this answer your question? How to decode a nested JSON struct with Swift Decodable protocol? — Fattie
– Fattie, Commented Sep 13, 2023 at 10:59

Gereon · Accepted Answer · 2018-02-26 18:39:04Z

17

Here's how I would model this:

struct Ticker: Codable {
    let autopayoutFrom, earning24_Hours: String
    let error: Bool
    let immatureEarning: Double
    let lastPaymentAmount, lastPaymentDate, lastShareDate: String
    let payoutDaily, payoutRequest: Bool
    let totalHashrate, totalHashrateCalculated, transferringToBalance: Double
    let wallet, walletBalance: String
    let workers: [String: Worker]

    enum CodingKeys: String, CodingKey {
        case autopayoutFrom = "autopayout_from"
        case earning24_Hours = "earning_24_hours"
        case error
        case immatureEarning = "immature_earning"
        case lastPaymentAmount = "last_payment_amount"
        case lastPaymentDate = "last_payment_date"
        case lastShareDate = "last_share_date"
        case payoutDaily = "payout_daily"
        case payoutRequest = "payout_request"
        case totalHashrate = "total_hashrate"
        case totalHashrateCalculated = "total_hashrate_calculated"
        case transferringToBalance = "transferring_to_balance"
        case wallet
        case walletBalance = "wallet_balance"
        case workers
    }
}

struct Worker: Codable {
    let alive: Bool
    let hashrate: Double
    let hashrateBelowThreshold: Bool
    let hashrateCalculated: Double
    let lastSubmit: String
    let secondSinceSubmit: Int
    let worker: String

    enum CodingKeys: String, CodingKey {
        case alive, hashrate
        case hashrateBelowThreshold = "hashrate_below_threshold"
        case hashrateCalculated = "hashrate_calculated"
        case lastSubmit = "last_submit"
        case secondSinceSubmit = "second_since_submit"
        case worker
    }
}

// usage examples:

let ticker = try JSONDecoder().decode(Ticker.self, from: data)
let workerKeys = ticker.workers.keys // "10003", "100151", "100205"
let workers = ticker.workers.values  // all workers objects

let alive = workers.filter { $0.alive } // all workers where alive==true
let totalHashrate = alive.reduce(0.0) { $0 + $1.hashrateCalculated }

edited Feb 26, 2018 at 18:39

answered Feb 26, 2018 at 16:58

Gereon

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5 Comments

confusedChris Over a year ago

Great stuff thanks, works perfectly with my existing code. I will try and parse out some of the hashrates etc :)

Cesare Over a year ago

@confusedChris remember to upvote and accept the answer :)

confusedChris Over a year ago

@Cesare I will indeed :)

confusedChris Over a year ago

Would you mind posting an example of parsing out some of the worker data please?

confusedChris Over a year ago

absolutely perfect. Thank you so much. makes sense :)

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