解码二级响应主体以构造

Question

I have 2 structs:

type List struct {
    ListID string `json:"listid"`
    Name string `json:"name"`
    Users []User `json:"users"`
}

type User struct {
    Email string `json:"email"`
    Name string `json:"name"`
}

I am calling an endpoint and successfully getting a response which has the structure below:

{
 "Results":[
  {"Email": "[e-mail]", "Name": "test1" "State": "Active",…},
  {"Email": "[e-mail]", "Name": "test2" "State": "Active",…},
  {"Email": "[e-mail]", "Name": "test3", "State": "Active",…}
 ],
 "SomeOtherStuff": "email"
}

I am trying to decode the JSON response to my struct like this:

err = json.NewDecoder(response.Body).Decode(&list.Users)

But there is no "Results" attribute in my struct to map to. How can I map only the Results key of the response to my array of User structs ?

Answer 1

To get your data there are at least two options:

Decode into map[string]interface{}

m := create(map[string]interface{})
err = json.NewDecoder(response.Body).Decode(&m)

Then use the m["results"] key to get at your users.

Or you could Decode into a container struct then assign list.Users = container.Results.

type Container struct {
    Results []User `json:"Results"`
    SomeOtherStuff string `json:"SomeOtherStuff"`
}

To get an idea of structs for arbitrary json look at json2go.