Golang的继承与Json

Question

There are two structures A & B. B includes A. Also there is a function attached to A. It returns json of the parent object. I expect to see all object fields in json when I call the fonction on instance of B, but I get only fields of A. Please look at the code:

type A struct {
    Foo string
}

type B struct {
    A
    Bar string
}

func (object *A) toJson() []byte {
    res, _ := json.Marshal(&object)
    return res
}


func main() {
    b := B{}
    fmt.Println(string(b.toJson()))
}

I expect to get {"Foo":"", "Bar":""} but the result is {"Foo":""}. The first way is to define two separate functions for both of structures. But is there the second solution with one function? Thank you in advance.

Answer 1

Your methodn toJson() is from A struct. change it to struct B then you will get your expected result.

package main

import (
    "encoding/json"
    "fmt"
)

type A struct {
    Foo string `json:"foo"`
}

type B struct {
    A
    Bar string `json:"bar"`
}

func (object *B) toJson() []byte {
    res, _ := json.Marshal(&object)
    return res
}

func main() {
    c := B{}
    fmt.Println(string(c.toJson()))
}