defining custom struct, confused

[Mudasir Mirza]

Hey guys,

I am fairly new to GoLang, still learning.

I am trying to working on a small utility, which fetches details from a third party.

As per their documentation, I will get response something like

{
  "users": [
    [
      {
        "firstName": "string ",
        "lastName": "string",
        "username": "string",
        "email": "string",
        "createdAt": "string",
        "passwordLastUpdated": "string",
        "verified": true,
        "_selfUrl": "string"
      },
      {
        "firstName": "string ",
        "lastName": "string",
        "username": "string",
        "email": "string",
        "createdAt": "string",
        "passwordLastUpdated": "string",
        "verified": true,
        "_selfUrl": "string"
      }
    ]
  ]
}

For this, I created struct type

type V1User struct {
 FirstName             string  `json:"firstName,omitempty"`
 LastName              string  `json:"lastName,omitempty"`
 UserName              string  `json:"username,omitempty"`
 Email                 string  `json:"email,omitempty"`
 CreatedAt             string  `json:"createdAt,omitempty"`
 PasswordLastUpdated   string  `json:"passwordLastUpdated,omitempty"`
 Verified              bool    `json:"verified,omitempty"`
 SelfUrl               string  `json:"_selfUrl,omitempty"`
}


type allUsers struct {
 users   []V1User `json:"users,omitempty"`
}

I am pretty sure I am missing out on something. I am running below code to fetch and decode the data

func (c *Client) getUsers() (users []allUsers, err error) {
 resp, err := c.request(http.MethodGet, "user", nil)
 if err != nil {
 return
 }
 defer resp.Body.Close()
 var result = struct {
 Users []allUsers
 }{}
 err = json.NewDecoder(resp.Body).Decode(&result)
 return result.Users, err
}

and I get error 

fmt.Println(result.Users)  ->  Users:  [{[]}]
fmt.Println(err)   ->   Error:  json: cannot unmarshal array into Go struct field .Users of type main.allUsers

I am still trying to figure out what's wrong here, any help will be appreciated.

[Steven Hartland]

If you look closely they have a strange structure:
 "users": [[{...},{...}]]

You've created:
"users":[{...},{...}]

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[Mudasir Mirza]

Hi Steven,

Thanks for your prompt response. I know that, but I can not figure out how to define that in my struct :(

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Mudasir Mirza

DevOps Manager

Dubizzle

[Mudasir Mirza]

Also as per the API documentation of the vendor, I am suppose to get a response in format

ListUserResponse {

users (Array[V1User], optional),

_selfUrl (string, optional)

}

[silviu...@gmail.com]

Two things:

1) Capitalize users inside allUsers so it can be populated via reflection

2) Use an intermediary type to allow for that slice inside slice

https://play.golang.org/p/RvW7PMSOZlq

[Mudasir Mirza]

Hey,

Thanks allot, that fixed the issue and I really appreciate it.