interface to json Marshal to add object id

[RoboTamer]

I can't figure out how to pass an interface to json Marshal to add the object id to the json file.

Actually it does add the id but not the rest of the fields.

I don't get an error

Below is a sample of what I been playing with. 

http://play.golang.org/p/jqO8pTvZFX

Copy of Playground code:

package main

import (

"encoding/json"

"fmt"

)

var merchants map[uint]Var = make(map[uint]Var)

var count uint

type Var interface{}

type Merchant struct {

Name string

}

type jsonObject struct {

Id uint

Var

}

func (v *Merchant) Add(name string) error {

v.Name = name

count++

merchants[count] = v

j := new(jsonObject)

j.Id = count

j.Var = *v

json, err := json.Marshal(&j)

if err != nil {

return err

}

fmt.Printf("\nJson: %s\n", json)

return nil

}

func main() {

fmt.Println("Hello, playground")

m := new(Merchant)

err := m.Add("Gopher Land")

if err != nil {

println(err.Error())

}

}

[Kyle Lemons]

The JSON package elides embedded fields (for now).  I believe this is slated to come back in Go 1.1

[RoboTamer]

Solution:

http://play.golang.org/p/LfpmU7rctO