如何从MoyaError获取错误响应 [英] how to get the error response from MoyaError

问题描述

类似于 this ，但这一次我需要检索服务器的JSOn响应.

similar to this but this time i need to retrieve the JSOn response of the server.

这是我现有的代码:

return Observable.create{ observer in
            let _ = self.provider
                .request(.getMerchantDetails(qrId: qrId))
                .filterSuccessfulStatusCodes()
                .mapJSON()
                .subscribe(onNext: { response in
                    observer.onNext(RQRMerchant(json: JSON(response)))
                }, onError: { error in
                    observer.onError(error)
                })
            return Disposables.create()

我的问题是:我可以通过error.localizedDescription获取错误响应代码404，但我也想获取404 HTTP请求的JSON响应.

my question is: I can get the error response code 404 by error.localizedDescription But I also want to get the JSON response of the 404 HTTP request.

推荐答案

我也遇到了同样的问题，对我来说，最简单，最干净的解决方案是扩展MoyaError，以包括已解码错误对象的属性. .在我的情况下，我使用的是Decodable对象，因此您可以为可解码的BackendError编写类似的代码，以表示可能从服务器获取的错误:

I've been faced with the same problem, and for me the easiest and cleanest solution was to extend MoyaError to include a property for the decoded error object. In my case I'm using Decodable objects, so you could write something like this for a decodable BackendError representing the error you may get from your server:

extension MoyaError {
    public var backendError: BackendError? {
        return response.flatMap {
            try? $0.map(BackendError.self)
        }
    }
}

如果您更喜欢直接处理JSON，则可以调用mapJSON方法，而不是映射到Decodable.

If you instead prefer to directly deal with JSON you can invoke the mapJSONmethod instead of mapping to a Decodable.

然后，您只需要执行以下操作即可获取不成功的状态代码的错误信息:

Then you just have to do the following to get the error information for non successful status codes:

onError: { error in
    let backendError = (error as? MoyaError).backendError
}

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