nested dictionary keys values in array using codable in swift 4

Question

I have the json in below structure

{
    "message": null,
    "data": {
        "admin": {
            "UserId": 1,
            "CUSTOMER_PROFILING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "RISK_ASSESSMENT": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "LINK_ANALYSIS": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "BENCH_MARKING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "SUSPICIOUS_TRANSACTION_REPORTING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "THRESHOLD_TRANSACTION_REPORTING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            }
        },
        "vinoth59": {
            "UserId": 15,
            "CUSTOMER_PROFILING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "RISK_ASSESSMENT": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "LINK_ANALYSIS": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "BENCH_MARKING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "SUSPICIOUS_TRANSACTION_REPORTING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "THRESHOLD_TRANSACTION_REPORTING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            }
        },
        "ba_user": {
            "UserId": 16,
            "CUSTOMER_PROFILING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "RISK_ASSESSMENT": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "LINK_ANALYSIS": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "BENCH_MARKING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "SUSPICIOUS_TRANSACTION_REPORTING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            },
            "THRESHOLD_TRANSACTION_REPORTING": {
                "id": 0,
                "total": 0,
                "high": 0,
                "low": 0,
                "medium": 0
            }
        }
    },
    "status": true
}

and my codable class look like below

struct UserRiskReportBase : Codable {
    let message : String?
    let data : [String:UserRiskReport]?
    let status : Bool?

    enum CodingKeys: String, CodingKey {

        case message = "message"
        case data = "data"
        case status = "status"
    }

    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        message = try values.decodeIfPresent(String.self, forKey: .message)
        data = try values.decodeIfPresent([String:[String:BenchMarking]].self, forKey: .data)
        status = try values.decodeIfPresent(Bool.self, forKey: .status)
    }

}
struct UserRiskReport: Codable {
    let userID: Int
    let customerProfiling, riskAssessment, linkAnalysis, benchMarking: BenchMarking
    let suspiciousTransactionReporting, thresholdTransactionReporting: BenchMarking

    enum CodingKeys: String, CodingKey {
        case userID = "UserId"
        case customerProfiling = "CUSTOMER_PROFILING"
        case riskAssessment = "RISK_ASSESSMENT"
        case linkAnalysis = "LINK_ANALYSIS"
        case benchMarking = "BENCH_MARKING"
        case suspiciousTransactionReporting = "SUSPICIOUS_TRANSACTION_REPORTING"
        case thresholdTransactionReporting = "THRESHOLD_TRANSACTION_REPORTING"
    }
    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        userID = try values.decodeIfPresent(Int.self, forKey: .userID)!
        customerProfiling = try values.decodeIfPresent(BenchMarking.self, forKey: .customerProfiling)!
        benchMarking = try values.decodeIfPresent(BenchMarking.self, forKey: .benchMarking)!
        riskAssessment = try values.decodeIfPresent(BenchMarking.self, forKey: .riskAssessment)!
        suspiciousTransactionReporting = try values.decodeIfPresent(BenchMarking.self, forKey: .suspiciousTransactionReporting)!
        linkAnalysis = try values.decodeIfPresent(BenchMarking.self, forKey: .linkAnalysis)!
        thresholdTransactionReporting = try values.decodeIfPresent(BenchMarking.self, forKey: .thresholdTransactionReporting)!

    }
}

struct BenchMarking : Codable {
    let id : Int?
    let total : Int?
    let high : Int?
    let low : Int?
    let medium : Int?

    enum CodingKeys: String, CodingKey {

        case id = "id"
        case total = "total"
        case high = "high"
        case low = "low"
        case medium = "medium"
    }

    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        id = try values.decodeIfPresent(Int.self, forKey: .id)
        total = try values.decodeIfPresent(Int.self, forKey: .total)
        high = try values.decodeIfPresent(Int.self, forKey: .high)
        low = try values.decodeIfPresent(Int.self, forKey: .low)
        medium = try values.decodeIfPresent(Int.self, forKey: .medium)
    }
}

I am able get the first level keys

let dec = JSONDecoder()
                    dec.keyDecodingStrategy = .convertFromSnakeCase
                    let alertList = try dec.decode(UserRiskReportBase.self, from:response.data!)

                    self.userRiskReportList = alertList.data!
                    self.headerArr = Array(alertList.data!.keys)

                    print(self.headerArr)

i get the first level keys like ["admin","vinoth59","ba_user"]. I need to get the second level keys ["CUSTOMER_PROFILING","RISK_ASSESSMENT",.....]. how to achieve using this codable

@JoakimDanielson I am using quicktype.io only. its only generate the above codable strucrure — Ben10
– Ben10, Commented May 15, 2020 at 7:55
Use dec.keyDecodingStrategy = .useDefaultKeys instead of dec.keyDecodingStrategy = . convertFromSnakeCase — udbhateja
– udbhateja, Commented May 15, 2020 at 8:03
@udbhateja if i change that how can access the second level keys — Ben10
– Ben10, Commented May 15, 2020 at 8:08
I removed all custom init methods and used a vanilla decoder JSONDecoder().decode(UserRiskReportBase.self, from: data) and I can access the values — Joakim Danielson
– Joakim Danielson, Commented May 15, 2020 at 8:10
@Ben10 You have added default keys for second level objects, this will work fine. I just checked this and the output is fine. Go ahead and try. — udbhateja
– udbhateja, Commented May 15, 2020 at 8:10

Joakim Danielson · Accepted Answer · 2020-05-15 09:01:48Z

2

The below works for me, note that I have done some simplifications and removed not needed code like init(from:) and I also removed Optional for a lot of properties

struct UserRiskReportBase : Codable {
    let message : String?
    let data : [String:UserRiskReport]
    let status : Bool?
}

struct UserRiskReport: Codable {
    let userID: Int
    let customerProfiling, riskAssessment, linkAnalysis, benchMarking: BenchMarking
    let suspiciousTransactionReporting, thresholdTransactionReporting: BenchMarking

    enum CodingKeys: String, CodingKey, CaseIterable {
        case userID = "UserId"
        case customerProfiling = "CUSTOMER_PROFILING"
        case riskAssessment = "RISK_ASSESSMENT"
        case linkAnalysis = "LINK_ANALYSIS"
        case benchMarking = "BENCH_MARKING"
        case suspiciousTransactionReporting = "SUSPICIOUS_TRANSACTION_REPORTING"
        case thresholdTransactionReporting = "THRESHOLD_TRANSACTION_REPORTING"
    }

    var allKeys: [String] {
        get {
            CodingKeys.allCases.map {$0.rawValue}
        }
    }
}

struct BenchMarking : Codable {
    let id : Int
    let total : Int
    let high : Int
    let low : Int
    let medium : Int
}

do {
    let result = try JSONDecoder().decode(UserRiskReportBase.self, from: data)
    for item in result.data.values {
        print("Report for user: \(item.userID)")
        print(item.customerProfiling)
        print(item.benchMarking)
        //print(...)
    }
} catch {
    print(error)
}

edited May 15, 2020 at 9:01

answered May 15, 2020 at 8:33

Joakim Danielson

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4 Comments

Ben10 Over a year ago

using this method how can form ["CUSTOMER_PROFILING","RISK_ASSESSMENT","LINK_ANALYSIS".....]

Joakim Danielson Over a year ago

You only want the keys?

Ben10 Over a year ago

Yes I want only the keys in array

Joakim Danielson Over a year ago

UserRiskReport.CodingKeys.allCases.map({$0.rawValue}) but you first must make CodingKeys conform to CaseIterable

udbhateja · Accepted Answer · 2020-05-15 08:46:44Z

1

    let dec = JSONDecoder()
    dec.keyDecodingStrategy = .useDefaultKeys
    let alertList = try? dec.decode(UserRiskReportBase.self, from: respData!)
    print("Compelete Data: ", alertList)

    let baUser = alertList?.data["ba_user"] as? UserRiskReport
    print("ba_user", alertList?.data["ba_user"])
    print(baUser?.benchMarking.id)
    print(baUser?.thresholdTransactionReporting.total)

Remember replacing .convertFromSnakeCase with .useDefaultKeys

answered May 15, 2020 at 8:46

udbhateja

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