使用 Decodable（嵌套数组）解析不同的 JSON

Question

我正在开发来自 NiceHash api 的应用程序。我必须使用的 JSON 看起来像这样：

 {
    "result":{
        "addr":"37ezr3FDDbPXWrCSKNfWzcxXZnc7qHiasj",
        "workers":[
                    [ "worker1", { "a":"45.7" }, 9, 1, "32", 0, 14 ],
                    [ "worker1", { }, 5, 1, "100000", 0, 22 ],
        ]
        "algo":-1
    },
    "method":"stats.provider.workers"
}

为了解析做了这样的结构

struct Root: Decodable {
    var result: WorkersResult?
    var method: String?
}

struct WorkersResult: Decodable {
    var addr: String?
    var workers: [Workers]?
    var algo: Int?
}

struct Workers: Decodable {
    var worker: [Worker]?
}

struct Worker: Decodable {
    var name: String?
    var hashrate: Hashrate?
    var time: Int?
    var XNSUB: Int?
    var difficult: String?
    var reject: Int?
    var algo: Int?
}

struct Hashrate: Decodable {
    var rate: String?
}

响应等于零，我不明白我做错了什么，我知道问题出在解析工人数组上，因为如果我评论工人，响应等于一些有效数据。感谢您的帮助！

Answer 1

您 JSON 实际上是无效的，因为逗号放错了。运行它通过 JSON 验证器得到我现在的意思。

总之，由于Worker（单数）被编码为一个数组，你需要为它提供一个自定义的解码器。 Workers（复数）是不必要的。

struct Root: Decodable {
    var result: WorkersResult?
    var method: String?
}

struct WorkersResult: Decodable {
    var addr: String?
    var workers: [Worker]?
    var algo: Int?
}

struct Worker: Decodable {
    var name: String?
    var hashrate: Hashrate?
    var time: Int?
    var XNSUB: Int?
    var difficult: String?
    var reject: Int?
    var algo: Int?

    init(from decoder: Decoder) throws {
        var container = try decoder.unkeyedContainer()
        name      = try container.decodeIfPresent(String.self)
        hashrate  = try container.decodeIfPresent(Hashrate.self)
        time      = try container.decodeIfPresent(Int.self)
        XNSUB     = try container.decodeIfPresent(Int.self)
        difficult = try container.decodeIfPresent(String.self)
        reject    = try container.decodeIfPresent(Int.self)
        algo      = try container.decodeIfPresent(Int.self)
    }
}

struct Hashrate: Decodable {
    var rate: String?

    private enum CodingKeys: String, CodingKey {
        case rate = "a"
    }
}

用法：

let jsonData = """
{
    "result":{
        "addr":"37ezr3FDDbPXWrCSKNfWzcxXZnc7qHiasj",
        "workers":[
                    [ "worker1", { "a":"45.7" }, 9, 1, "32", 0, 14 ],
                    [ "worker1", { }, 5, 1, "100000", 0, 22 ]
        ],
        "algo":-1
    },
    "method":"stats.provider.workers"
}
""".data(using: .utf8)!

let r = try JSONDecoder().decode(Root.self, from: jsonData)
print(r)

使用 Decodable（嵌套数组）解析不同的 JSON

Parse different JSON with Decodable (Nested array)

json

swift4

decodable