我有一个JSON查询的以下响应。如何将字典表示为可编码的?我缩短了JSON响应以节省空间。

{
 "result":[
            {
            "delivery_address": "",
            "made_sla": "true",
            "watch_list": "",
            "upon_reject": "cancel",
            "location": {
                "link": "https://foo.com/api/now/table/cmn_location/753ac76f4fd9320066bfb63ca310c79b",
                "value": "753ac76f4fd9320066bfb63ca310c79b"
             }
          }
    ]
}

struct ResultList : Codable {
   let result: [Result]
}

struct Result : Codable {
    let delivery_address: String
    let made_sla: String
    let watch_list: String
    let upon_reject: String
    let location: Location
}

struct Location: Codable {
    let link: String?
    let value: String?
}

  let decoder = JSONDecoder()
  do {
      let todo = try decoder.decode(ResultList.self, from: responseData)

      print("todo \(todo)")

      } catch {
        print("error trying to convert data to JSON")
        print(error)

      }

我得到以下错误:
"Expected to decode Dictionary<String, Any> but found a string/data instead.", underlyingError: nil))

最佳答案

基于所有的评论,我相信您实际解码的JSON看起来更像这样:

{
    "result": [{
            "delivery_address": "",
            "made_sla": "true",
            "watch_list": "",
            "upon_reject": "cancel",
            "location": {
                "link": "https://foo.com/api/now/table/cmn_location/753ac76f4fd9320066bfb63ca310c79b",
                "value": "753ac76f4fd9320066bfb63ca310c79b"
            }
        },
        {
            "delivery_address": "",
            "made_sla": "true",
            "watch_list": "",
            "upon_reject": "cancel",
            "location": ""

        }
    ]
}

所以有些记录有一个位置,有些记录将位置编码为空字符串。基本上,在很多级别上,这确实是一个混乱的JSON,无论生成什么代码,都应该被修复。坏消息我肯定不会发生。好消息是我们至少可以在本地修复。
我们将不得不手工解码,所以我们不妨在这里清理所有的残局。首先,这些名称与Swift命名约定不匹配。我们可以使用CodingKeys修复这个问题。我们还可以为当前类型错误的字符串提供实数类型(Bool和拒绝枚举)。
enum Rejection: String, Codable {
    case cancel
}
struct Result : Codable {
    let deliveryAddress: String
    let madeSLA: Bool
    let watchList: String
    let uponReject: Rejection
    let location: Location?

    private enum CodingKeys: String, CodingKey {
        case deliveryAddress = "delivery_address"
        case madeSLA = "made_sla"
        case watchList = "watch_list"
        case uponReject = "upon_reject"
        case location
    }
}

现在我们只需要能够解码它。请注意,我将位置设置为可选。显然,它有时不存在,所以您要么需要缺省值,要么需要是可选的。我选择了后者。解码所有这些是非常直接的:
init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)
    deliveryAddress = try container.decode(String.self, forKey: .deliveryAddress)
    madeSLA = try container.decode(String.self, forKey: .madeSLA) == "true"
    watchList = try container.decode(String.self, forKey: .watchList)
    uponReject = try container.decode(Rejection.self, forKey: .uponReject)

    location = try? container.decode(Location.self, forKey: .location)
}

最后一行是你的实际问题。它只是说,如果我们不能将其解码为Location,请将其设置为nil。在这里我们可以更严格一些,首先尝试将其解码为一个位置,然后将其解码为一个字符串,然后检查字符串是否为空,但是对于任何解码失败,在这里使用nil都是合理的。

关于ios - 如何在“可编码”响应中使用字典?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/47145823/

10-09 06:58
查看更多