*int decode as string has error

[gatspy]

type P struct {
    ID *uint64 `json:"id,string"`
}

func main() {
  var p = P {
    ID: nil,
  }
  js, err  := json.Marshal(p)
  if err!=nil {
    fmt.Println(err.Error())
  }
  fmt.Printf("p = %s\n", js)
}

output as follow:

p = {"id":"null"}

how decode nil pointer to null?

[Sculas]

I'm not sure if I misunderstood your issue, but it seems like it does exactly what it's supposed to do.

You pass in a nil ptr, which evaluates to nil anyway. The string representation of nil is "null", so that's what gets returned. Hence, ID is "null".

So, what's the problem here?