英文:
JSON decode specific field golang
问题
我有一个简单的函数，从特定的URI获取JSON响应。该函数接受httpRequest和interface{}作为参数，其中interface{}是我想要将JSON响应解组到的结构体的指针。
func (c *Client) SendRequest(req *http.Request, v interface{}) error {
...
return json.NewDecoder(resp.Body).Decode(&v)
}
JSON响应的示例是：
{
"data": {
"id": "9da7a204-544e-5fd1-9a12-61176c5d4cd8"
}
}
结构体的示例是：
type User struct {
ID string `json:"id,omitempty"`
}
现在的问题是data对象。由于该对象未包含在我的结构体中，解码操作会失败。我想直接解码data对象的内容，而不使用临时结构体，但我不知道如何做到。
英文:
I have this simple function, which gets a JSON response from a specific URI. The function accepts the httpRequest and an interface{}, which is a pointer to the struct in which I want to unmarshal my JSON response.
func (c *Client) SendRequest(req *http.Request, v interface{}) error {
...
return json.NewDecoder(resp.Body).Decode(&v)
}
An example of JSON response is:
{
"data": {
"id": "9da7a204-544e-5fd1-9a12-61176c5d4cd8"
}
}
An example of struct is:
type User struct {
ID string `json:"id;omitempty"`
}
Now, the problem is the data object. With this object, the Decode operation fails, as the object it is not included in my struct. I would like to Decode the content of data object directly, without using a temporary struct, but I don't understand how to do it.
答案1
得分: 2
使用一个包含User结构体的结构体进行解组。请参考下面的Response结构体。
type User struct {
ID string `json:"id,omitempty"`
}
type Response struct {
Data User `json:"data"`
}
解组后，如果r是你的Response实例，你可以通过r.Data访问你的User。
由于在编译时你不知道类型，你也可以将字段的类型设置为interface{}。
type Response struct {
Data interface{} `json:"data"`
}
r := Response{
Data: &User{},
}
json.NewDecoder(resp.Body).Decode(&r)
然后通过以下方式获取你的用户实例：
userNew, _ := r.Data.(*User)
附注：你的代码中的json标签有一个拼写错误。请将;替换为,。
英文:
Use a struct that contains a User struct to unmarshal into. See Response struct below.
type User struct {
ID string `json:"id;omitempty"`
}
type Response struct {
Data User `json:"data"`
}
After unmarshaling if r is your Response instance you can access your User by r.Data
Since you don't know the type at compile time you can use interface{} as the type of the field too.
type Response struct {
Data interface{} `json:"data"`
}
r := Response{
Data: &User{},
}
json.NewDecoder(resp.Body).Decode(&r)
And then get your user instance by
userNew, _ := r.Data.(*User)
P.S: You have a typo on your code at json tag. Replace ; by ,
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