在Golang中解析JSON的类型模型。

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英文:

Json unmarshal type model in golang

问题

我有一个返回类似下面的响应的 RESTful 服务:

"Basket" : {
  "Count": 1,
  "Fruits": [
    {
      "Name":"Mango", 
      "Season":"Summer"
    },
    {
      "Name":"Fig", 
      "Season":"Winter"
    }
  ]
}

我正在尝试创建一个 Go 语言模型来解组内容。以下是我尝试过的代码:

type Response struct {
    Count   int
    Fruits []Fruit
}

type Fruit struct {
    Name string
    Season string
}

但是,当我在测试代码中对 Response 对象进行编组时,我没有看到类似的 JSON 结构。(https://play.golang.org/p/EGKqfbwFvW)
编组后的数据总是出现如下形式:

{
  "Count":100,
  "Fruits":[
    {"Name":"Mango","Season":"Summer"},
    {"Name":"Fig","Season":"Winter"}
  ]
}

请注意,原始 JSON 中的 Fruits 是一个数组 [],而不是 {[]}。我该如何在 golang 中为这个响应建模?

英文:

I have a RESTful service that returns response similar to show below:

"Basket" : {
  "Count": 1,
  "Fruits": {[
    {
      "Name":"Mango", 
      "Season":"Summer"
    },
    {
      "Name":"Fig", 
      "Season":"Winter"}
  ]}
}

I am trying to create Go lang model to unmarshal the contents. Following is the code I have tried:

type Response struct {
    Count   int
    Fruits []Fruit
}

type Fruit struct {
    Name string
    Season string
}

But when I marshal the Response object in my test code I don't see similar json. (https://play.golang.org/p/EGKqfbwFvW)
Marshalled data always appears as :

{
  "Count":100,
  "Fruits":[
    {"Name":"Mango","Season":"Summer"},
    {"Name":"Fig","Season":"Winter"}
  ]
}

Notice the Fruits appearing as array [] and not {[]} in original json. How can I model structs in golang for this response?

答案1

得分: 2

你的模型是完全正确和有效的,但是 JSON 对象不正确。"Fruits"没有名称,如果它应该是键值对,或者它应该被包裹在[]而不是{}中。

JSON 对象应该像这样格式化:

{
  "Basket" : {
    "Count": 1,
    "Fruits": [
      {
        "Name":"Mango", 
        "Season":"Summer"
      },
      {
        "Name":"Fig", 
        "Season":"Winter"
      }
    ]
  }
}

实际上,无效的 JSON 不应该起作用 链接

英文:

Your model is totally correct and valid, but the JSON object is not. "Fruits" doesn't have name if it should be key value pair or it should be wrapped in [] not {}.

JSON obj should be formatted like this:

{
  "Basket" : {
    "Count": 1,
    "Fruits": [
      {
        "Name":"Mango", 
        "Season":"Summer"
      },
      {
        "Name":"Fig", 
        "Season":"Winter"
      }
    ]
  }
}

And actually invalid json shouldn't work https://play.golang.org/p/yoW7t4NfI7

答案2

得分: 1

我会将'Baskets'作为'Response'中的一个结构体,并创建一个'BasketsData'结构体,并为其添加一些标签。

type Fruit struct {
    Name   string `json:"Name"`
    Season string `json:"Season"`
}

type BasketData struct {
    Count  int     `json:"Count"`
    Fruits []Fruit `json:"Fruits"`
}

type Response struct {
    Basket BasketData `json:"Basket"`
}

这样,当你进行编组时,你将得到一个顶级的JSON响应。

fruitmania := []Fruit{{Name: "Mango", Season: "Summer"},
                     {Name: "Fig", Season: "Winter"}}
basket := Response{BasketData{Count: 100, Fruits: fruitmania}}

b, _ := json.Marshal(basket)
fmt.Println(string(b))

请查看以下链接以了解更多信息:
https://play.golang.org/p/TuUwBLs_Ql

英文:

I would make 'Baskets' a struct within 'Response', create a 'BasketsData' struct, and give it all some labels.

type Fruit struct {
	Name   string `json:"Name"`
	Season string `json:"Season"`
}

type BasketData struct {
	Count  int     `json:"Count"`
	Fruits []Fruit `json:"Fruits"`
}

type Response struct {
	Basket BasketData `json:"Basket"`
}

This way you will get a top level JSON response when you marshall it.

fruitmania := []Fruit{{Name: "Mango", Season: "Summer"},
                       {Name: "Fig", Season: "Winter"}}
basket := Response{BasketData{Count: 100, Fruits: fruitmania}}

b, _ := json.Marshal(basket)
fmt.Println(string(b))

checkit-checkit out:
https://play.golang.org/p/TuUwBLs_Ql

huangapple
  • 本文由 发表于 2017年2月2日 07:52:53
  • 转载请务必保留本文链接:https://go.coder-hub.com/41992035.html
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