解码器未在关键路径解码 json

Question

我正在尝试解码一些 JSON，但它没有解析它。我认为它可能与不正确的 KeyPath 或对象本身有关。但是我想不通。

这是我要解码的 JSON（我想要文档路径中的数组）：

{
    "status": 200,
    "data": {
        "docs": [
            {
                "_id": "60418a6ce349d03b9ae0669e",
                "title": "Note title",
                "date": "2015-03-25T00:00:00.000Z",
                "body": "this is the body of my note.....",
                "userEmail": "myemail@gmail.com"
            }
        ],
        "total": 1,
        "limit": 20,
        "page": 1,
        "pages": 1
    },
    "message": "Notes succesfully Recieved"
}

这是我的解码函数：

extension JSONDecoder {
    func decode<T: Decodable>(_ type: T.Type, from data: Data, keyPath: String) throws -> T {
        let toplevel = try JSONSerialization.jsonObject(with: data)
        if let nestedJson = (toplevel as AnyObject).value(forKeyPath: keyPath) {
            let nestedJsonData = try JSONSerialization.data(withJSONObject: nestedJson)
            return try decode(type, from: nestedJsonData)
        } else {
            throw DecodingError.dataCorrupted(.init(codingPath: [], debugDescription: "Nested json not found for key path \"\(keyPath)\""))
        }
    }
}

我这样称呼它：

let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let notes = try decoder.decode([Note].self, from: data, keyPath: "data.docs")

最后，这是我的笔记结构：

struct Note: Codable {
    var title: String?
    let date: Date?
    var body: String?
    let userEmail: String?
}

Answer 1

问题是我试图将日期解码为 Date 对象而不是 JSON.

中显示的字符串

谢谢@vadian！

解码器未在关键路径解码 json

Decoder not decoding json at keypath

json

swift

jsondecoder