处理 json 响应 Observable swift

Question

我有一个使用 SwiftyJSON 并且可以工作的应用程序。但是，我现在想扩展项目并重构代码，但我遇到了一些问题，因为我现在切换到 Codable，我需要能够从任何路径而不是硬编码路径映射 JSON。目前我的 jsonResponse 看起来像这样

/// handle the network response and map to JSON
    /// - returns: Observable<JSON>
    func handleResponseMapJSON() -> Observable<Result<JSON, ORMError>> {

        return self.map { representor in

            guard let response = representor as? Moya.Response else {
                return .failure(ORMError.ORMNoRepresentor)
            }

            guard ((200...299) ~= response.statusCode) else {
                return .failure(ORMError.ORMNotSuccessfulHTTP)
            }

            guard let json = JSON.init(rawValue: response.data),
                json != JSON.null,
                let code = json["code"].int else {
                    return .failure(ORMError.ORMParseJSONError)
            }

            guard code == BizStatus.BizSuccess.rawValue else {
                let message: String = {
                    let json = JSON.init(data: response.data)
                    guard let msg = json["status"].string else { return "" }
                    return msg
                }()
                log(message, .error)
                return .failure(ORMError.ORMBizError(resultCode: "\(code)", resultMsg: message))
            }

            return .success(json["result"])

        }
    }

如何消除硬编码json[""] 值的通道。任何帮助表示赞赏

Answer 1

我建议你试试这样的：

protocol ResponseType: Codable {
    associatedtype ResultType
    var status: String { get }
    var code: Int { get }
    var result: ResultType { get }
}

func handleResponseMap<T, U>(for type: U.Type) -> (Any) -> Result<T, ORMError> where U: ResponseType, T == U.ResultType {
    return { representor in
        guard let response = representor as? Moya.Response else {
            return .failure(.ORMNoRepresentor)
        }
        guard ((200...299) ~= response.statusCode) else {
            return .failure(.ORMNotSuccessfulHTTP)
        }
        return Result {
            try JSONDecoder().decode(U.self, from: response.data)
            }
            .mapError { _ in ORMError.ORMParseJSONError }
            .flatMap { (response) -> Result<T, ORMError> in
                guard response.code == BizStatus.BizSuccess.rawValue else {
                    log(response.status, .error)
                    return Result.failure(ORMError.ORMBizError(resultCode: "\(response.code)", resultMsg: response.status))
                }
                return Result.success(response.result)
        }
    }
}

然后你可以直接映射到你的 Codable 类型：

let result = self.map(handleResponseMap(for: MyResponse.self))

在上面，结果将是Observable<Result<ResultType, ORMError>>

Answer 2

我想对PrimitiveSequenceType 进行扩展，将其视为Single

import Foundation
import RxSwift
import Moya

 public extension PrimitiveSequenceType where TraitType == SingleTrait, ElementType == Response {
    func map<T>(_ type: T.Type, using decoder: JSONDecoder? = nil) -> PrimitiveSequence<TraitType, T> where T: Decodable {
        return self.map { data -> T in
            let decoder = decoder ?? JSONDecoder()
            return try decoder.decode(type, from: data.data)
        }
    }
}

你可以像这样简单地使用它：

return  PokeAPIEndPoints.shared.provider.rx
        .request(.specieDetails(id: specieId))
        .filterSuccessfulStatusCodes()
        .map(SpecieDetails.self)