编译器:尽管给出了所有参数，但给出了太多参数 [英] Compiler: too many arguments given despite that all are given

问题描述

我想使用 DataResponse 结构作为 JSON()的参数来与用户响应.通过初始化 DataResponse 的实例，我得到了错误消息，给出了太多的参数，但给出了所有必需的参数.

I want to use the struct DataResponse as parameter for JSON() to respond with the user. By initializing an instance of DataResponse I get the error message, that too many arguments are given, but gave all that are necessary.

type DataResponse struct {
    Status int         `json:"status"`
    Data   interface{} `json:"data"`
}

func GetUser(rw http.ResponseWriter, req *http.Request, ps httprouter.Params) {
    user := models.User{}
    // Fetching user from db

    resp := DataResponse(200, user)
    JSON(rw, resp) // rw is the ResponseWriter of net/http
}

编译器将引发以下错误消息:

The following error message is thrown by the compiler:

too many arguments to conversion to DataResponse: DataResponse(200, user)

DataResponse 需要给定两个参数，并且 Data 是一个接口，因此它应该接受 models.User 作为数据类型.

DataResponse requires two parameters that are given and Data is an interface so it should accept models.User as datatype.

推荐答案

resp := DataResponse(200, user)

语法错误.尝试使用花括号进行结构初始化:

The syntax is wrong. Try curly braces for struct initialization:

resp := DataResponse{200, user}
                    ^         ^

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