将包含动态键的REST API返回的JSON映射到Golang中的结构

问题描述：

I'm calling a REST API from my Go program which takes n number of hotel ids in the request and returns their data as a JSON. The response is like the following when say I pass 2 ids in the request, 1018089108070373346 and 2017089208070373346 :

{
 "data": {
  "1018089108070373346": {
    "name": "A Nice Hotel",
    "success": true
   },
  "2017089208070373346": {
    "name": "Another Nice Hotel",
    "success": true
   }
  }
}

Since I'm new to Golang I using a JSON Go tool available at http://mholt.github.io/json-to-go/ to get the struct representation for the above response. What I get is:

type Autogenerated struct {
    Data struct {
        Num1017089108070373346 struct {
            Name string `json:"name"`
            Success bool `json:"success"`
        } `json:"1017089108070373346"`
        Num2017089208070373346 struct {
            Name string `json:"name"`
            Success bool `json:"success"`
        } `json:"2017089208070373346"`
    } `json:"data"`
}

I cannot use the above struct because the actual id values and the number of ids I pass can be different each time, the JSON returned will have different keys. How can this situation be mapped to a struct ?

Thanks

我正在从Go程序中调用REST API，该程序需要 n em>个酒店请求中的id，并以JSON形式返回其数据。当我说我在请求中传递2个ID 1018089108070373346和2017089208070373346时，响应如下所示： p>

  {
“ data”：{
“ 1018089108070373346”：{\  n“名称”：“一家不错的酒店”，
“成功”：是
}，
“ 2017089208070373346”：{
“名称”：“另一家不错的酒店”，
“成功”：是
  } 
} 
} 
  code>  pre> 
 
 由于我是Golang的新手，因此我使用了 http://mholt.github.io/json-to-go/ 以获得上述响应的结构表示。 我得到的是： p> 
 
 
  type自动生成的结构{
数据结构{
 Num1017089108070373346结构{
 Name string`json：“ name”`
 Success bool`json  ：“ success”`
}`json：“ 1017089108070373346”`
 Num2017089208070373346 struct {
 Name string`json：“ name”`
 Success bool`json：“ success”`
}`json：“ 2017089208070373346  “`
}`json：” data“`
} 
  code>  pre> 
 
 我无法使用上述结构，因为实际的id值和我通过的id数 每次可以不同，返回的JSON将具有不同的密钥。 如何将这种情况映射到结构？ p> 
 
 
谢谢 p> 
  div>

答

Use a map:

type Item struct {
    Name string `json:"name"`
    Success bool `json:"success"`
} 
type Response struct {
    Data map[string]Item `json:"data"`
}

Run it on the playground

答

Here is some sample code that utilizes Mellow Marmots answer and shows how to iterate over the items in the response.

test.json

{
 "data": {
  "1018089108070373346": {
    "name": "A Nice Hotel",
    "success": true
   },
  "2017089208070373346": {
    "name": "Another Nice Hotel",
    "success": true
   }
  }
}

test.go

package main

import (
    "encoding/json"
    "fmt"
    "os"
)

// Item struct
type Item struct {
    Name    string `json:"name"`
    Success bool   `json:"success"`
}

// Response struct
type Response struct {
    Data map[string]Item `json:"data"`
}

func main() {
    jsonFile, err := os.Open("test.json")
    if err != nil {
        fmt.Println("Error opening test file
", err.Error())
        return
    }

    jsonParser := json.NewDecoder(jsonFile)
    var filedata Response
    if err = jsonParser.Decode(&filedata); err != nil {
        fmt.Println("Error while reading test file.
", err.Error())
        return
    }

    for key, value := range filedata.Data {
        fmt.Println(key, value.Name, value.Success)
    }
}

Which outputs:

1018089108070373346 A Nice Hotel true
2017089208070373346 Another Nice Hotel true

将包含动态键的REST API返回的JSON映射到Golang中的结构

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