I'm developing a Telegram Bot API wrapper for Golang (I know there are already some but I'm doing this for learning). I have a Response struct:
type Response struct {
Ok bool `json:"ok"`
ErrorCode int64 `json:"error_code"`
Description string `json:"description"`
Result interface{} `json:"result"`
}
I can't know the actual type of Result
: a lot can be returned by Telegram servers; I made a struct for each one, but I don't know which one will be in Result
. When Unmarshal
ing a JSON from an HTTP response into the Response
struct, everything is loaded correctly, except Result
.
In a function where I am sure Result will be an User
(for example), I'm doing user := resp.Result.(*User)
, but I get the following error at runtime: panic: interface conversion: interface {} is map[string]interface {}, not *tgbot.User
. So, Result
is a map[string]interface{}
. How can I transform it into a *User
?
Thanks for any answers.
Make it a json.RawMessage
and unmarshal it in a second step, when you're sure what type it is.
Take a look at the examples at https://golang.org/pkg/encoding/json/#RawMessage.