How to make codable class to decode json array which doesn't have a key/name?

Question

I'm trying to decode following JSON to my codable object.

[
        {
            "Action": "CREDIT",
            "Status": 1,
            "TransactionDate": "2019-09-20T04:23:19.530137Z",
            "Description": "test"
        },
        {
            "Action": "CREDIT",
            "Status": 1,
            "TransactionDate": "2019-09-20T04:23:19.530137Z",
            "Description": "test"
        },
        {
            "Action": "CREDIT",
            "Status": 1,
            "TransactionDate": "2019-09-20T04:23:19.530137Z",
            "Description": "test"
        }
]

My codable classes be like..

struct UserWalletHistoryList: Codable {
    var historyList: [UserWalletHistory]
}


struct UserWalletHistory: Codable{
    var Action: String?
    var Status: Int?
    var TransactionDate: String?
    var Description: String?
}

but it is not successful. I think it's because of the variable name historyList since there is no such key as historyList in the JSON. Then..., what's it supposed to be?

vadian · Accepted Answer · 2019-09-23 10:35:21Z

6

Delete UserWalletHistoryList

~~struct UserWalletHistoryList: Codable { var historyList: [UserWalletHistory] }~~

and decode an array of UserWalletHistory

JSONDecoder().decode([UserWalletHistory].self, from: data)

and as the JSON provides all keys in all dictionaries declare the struct members as non-optional and add CodingKeys to map the uppercase keys to lowercase member names

struct UserWalletHistory : Codable {
    let action: String
    let status: Int
    let transactionDate: String
    let description: String

    private enum CodingKeys : String, CodingKey { 
        case action = "Action"
        case status = "Status"
        case transactionDate = "TransactionDate"
        case description = "Description" 
    }
}

edited Sep 23, 2019 at 10:35

answered Sep 23, 2019 at 10:25

vadian

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2 Comments

Fattie Over a year ago

I did not know that! I guess you could just use a typedef for the [ ] to keep it similar.

Zin Win Htet Over a year ago

It works @vadian. And the CodingKeys stuff is really useful.

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