JSON解码器返回没有与键CodingKeys关联的值，例如IAP收据中的“expires_date”

Question

我在大约 2 个月前实施了Auto-Renewable subscriptions，它们运行良好。

但是，当我现在回来在沙盒中测试它们时，我最终得到了No value with key expires_date found。

我调试并打印出latest_receipt_info，它显然是一个字符串。为什么会这样？我再次查看了收据，Apple 将一些密钥更改为Int，但我的expires 日期仍然保持不变。我哪里错了？

这是我的代码和收据。错误说

"没有与键 CodingKeys 关联的值(stringValue: \"expires_date\", intValue: nil) (\"expires_date\")。"

最新收据

"latest_receipt_info" =     (
                {
            "expires_date" = "2019-02-06 15:50:21 Etc/GMT";
            "expires_date_ms" = 1549468221000;
            "expires_date_pst" = "2019-02-06 07:50:21 America/Los_Angeles";
            "is_in_intro_offer_period" = false;
            "is_trial_period" = false;
            "original_purchase_date" = "2019-03-21 08:37:40 Etc/GMT";
            "original_purchase_date_ms" = 1553157460000;
            "original_purchase_date_pst" = "2019-03-21 01:37:40 America/Los_Angeles";
            "original_transaction_id" = 1000000495291060;
            "product_id" = "com.myApp.myApp.autoRenewableSubscription";
            "purchase_date" = "2019-02-06 15:45:21 Etc/GMT";
            "purchase_date_ms" = 1549467921000;
            "purchase_date_pst" = "2019-02-06 07:45:21 America/Los_Angeles";
            quantity = 1;
            "transaction_id" = 1000000512208509;
            "web_order_line_item_id" = 1000000042609485;
        }

收据信息

struct IAPReceiptInfo: Decodable {

    let expiresDate: String

    private enum CodingKeys: String, CodingKey {
        case expiresDate = "expires_date"
    }
}

struct IAPReceipt: Decodable {

    let latestReceipt: String
    let status: Int
    var receiptInfo = [IAPReceiptInfo]()

    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: Codingkeys.self)
        self.latestReceipt = try container.decode(String.self, forKey: .latestReceipt)
        self.status = try container.decode(Int.self, forKey: .status)
        self.receiptInfo = try container.decode([IAPReceiptInfo].self, forKey: .latestInfos)
    }

    var latestInfo: IAPReceiptInfo? {
        return self.receiptInfo.last
    }

    var IAPLatestReceipt: String {
        return self.latestReceipt
    }

    private enum Codingkeys: String, CodingKey {
        case latestReceipt = "latest_receipt"
        case status
        case latestInfos = "latest_receipt_info"
    }
}

IAPReceiptAPI

    func sendReceiptForToServer(completion pCompletion: @escaping (([IAPReceiptInfo]?, Error?) -> Void)) {
         let receiptData = self.getReceipt?.base64EncodedString()
         let requestReceiptDict = ["receipt": receiptData]
        if receiptData == nil {
            let error = NSError(domain: "No Rec", code: 0, userInfo: nil)
            pCompletion(nil, error)
        }
        do {
            let data = try requestReceiptDict.vyEncode()
            guard let validationUrl = URL(string: "https://us-central1-myApp-a8e27.cloudfunctions.net/receiptValidation") else { return }
            let session = URLSession(configuration: .default)
            var request = URLRequest(url: validationUrl, cachePolicy: .reloadIgnoringLocalCacheData)
            request.setValue("application/json", forHTTPHeaderField: "Content-Type")
            request.httpMethod = "POST"
            request.httpBody = data
            let task = session.uploadTask(with:request, from: data) { (data, response, error) in
                guard let data = data, error == nil else { return }
                do {
                    let receipt = try IAPReceipt.vyDecode(data: data)
                    if let receiptLatestInfo = receipt.latestInfo {
                        pCompletion([receiptLatestInfo], nil)
                    }
                } catch let error {
                    pCompletion(nil, error)
                }
            }
            task.resume()
        } catch let error {
            pCompletion(nil, error)
        }
    }
}

Answer 1

刚刚发现expires_date 已更改，并且在某些情况下可能会丢失，因此必须将其设为optional 并立即使用。

struct IAPReceiptInfo: Decodable {

    let expiresDate: String?

    private enum CodingKeys: String, CodingKey {
        case expiresDate = "expires_date"
    }
}