Pull API request into nested struct-CodePudding

I'm currently pulling an API response into a struct.

I'm fine with a normal response of say:

  [ 
    {"date":"2021-10-04","user":"Test","url":"Anonymous"]},
    {"date":"2021-10-04","user":"Test","url":"Anonymous"]},
    {"date":"2021-10-04","user":"Test","url":"Anonymous"]},
  ]

However when I get data like this:

  "urls": [
    {"date":"2021-10-04","user":"Test","url":"Anonymous"]},
    {"date":"2021-10-04","user":"Test","url":"Anonymous"]},
    {"date":"2021-10-04","user":"Test","url":"Anonymous"]},
  ]

I cant seem to parse it to the struct.

It seems like a stupid question as its basically the same.

Here is what I am doing:

   type urls struct {
    Urls struct {
        Date   string `json:"date"`
        User   string `json:"user"`
        Urls   string `json:"urls"`
    } `json:"urls"`
   }

   type url []urls

and within the function:

   resp, err := http.Get("https://url")
   if err != nil {
        fmt.Println("No response from request")
   }
   defer resp.Body.Close()
   body, err := ioutil.ReadAll(resp.Body) // response body is []byte
   var u url
   _ = json.Unmarshal(body, &u)

Unfortunately this isnt working and u is empty.

With the first response I can have a struct like this and it works fine:

  type urls struct {
       Date   string `json:"date"`
       User   string `json:"user"`
       Urls   string `json:"urls"`
  }

CodePudding user response：

I think what I'm trying to say is a combination of the above and plus a little bit of my experience.

Your Urls field is an array in JSON, but not in the struct you declared.
You should not ignore the error returned by json.Unmarshal(body, &u) .
The Json you posted is not grammatically correct. I modified your Json string slightly, it could be:

{
"urls": [
    {"date":"2021-10-04","user":"Test","url":"Anonymous"},
    {"date":"2021-10-04","user":"Test","url":"Anonymous"},
    {"date":"2021-10-04","user":"Test","url":"Anonymous"}
  ]
}

And to Go struct should be:

type URL struct {
    SubURLs []struct {
        Date string `json:"date"`
        User string `json:"user"`
        URL  string `json:"url"`
    } `json:"urls"`
}

Next, I introduce you to one possible way when you are dealing with JSON to Go structs: You can paste your Json on this website, and then you can get its corresponding Go structure, and you can also correct your Json by the way.