Golang: Multiple structs marshall issue: json format

Question

For the following code, I get the error:

type A struct{
    B_j []B `json:"A"` 
}
type B struct
{
    X string
    Y string

}

func main() {
    xmlFile, _ := os.Open("test.xml")

    b, _ := ioutil.ReadAll(xmlFile)

    var t root
    err2 := xml.Unmarshal(b, &rpc)
    if err2 != nil {
        fmt.Printf("error: %v", err2)
        return
    }

    for _, name := range t.name{
        t := A{B_j : []B{X : name.text, Y: name.type }} // line:#25

        s, _ := json.MarshalIndent(t,"", " ")

    os.Stdout.Write(s)
        }
}

# command-line-arguments
./int2.go:25: undefined: X
./int2.go:25: cannot use name.Text (type string) as type B in array or slice literal
./int2.go:25: undefined: Y
./int2.go:25: cannot use name.type (type string) as type B in array or slice literal

In my output, I am trying to achieve something like this:

{A: {{X:1 ,Y: 2}, {X:2 ,Y: 2}, {X: 2,Y: 2}}}

Struct calling another struct to get the pattern above.

Yesterday you posted question about XML unmarshall issue of your RPC XML. I have analyzed and answered your question. You didn't accepted the answer, simply you replied "Thanks, that's stupid of me" and deleted the SO question. I suggest not to do that going forward, it is not good for the community. — jeevatkm
– jeevatkm, Commented Jun 16, 2017 at 19:25
@jeevatkm : that was definitely an unconscious error from my end. Its back now. Apologies! — Bazinga
– Bazinga, Commented Jun 16, 2017 at 19:27
Thanks, no issues. I just thought to bring it your attention. BTW I hope that answer solved your issue. Please accept the answer in SO. — jeevatkm
– jeevatkm, Commented Jun 16, 2017 at 19:31
Is the quoted file int2.go? Which line is 156? The compiler error is telling you what's wrong, but without any context there's no way for anyone else to help you. — Adrian
– Adrian, Commented Jun 16, 2017 at 19:32

jeevatkm · Accepted Answer · 2017-06-16 20:07:40Z

1

It seems you have problem at this line-

t := A{B_j: []B{X: name.text, Y: name.type }}

You're not creating a slice properly. Try following-

t := A{B_j: []B{{X: name.text, Y: name.type}}}

Let's do it better way-

var bj []B
for _, name := range t.name{
  bj = append(bj, B{X: name.text,Y: name.type})
}

t := A{B_j: bj}
s, _ := json.MarshalIndent(t,"", " ")      
os.Stdout.Write(s)

Sample program with static values https://play.golang.org/p/a2ZDV8lgWP

Note: type is language keyword, do not use it as variable name.

edited Jun 16, 2017 at 20:07

answered Jun 16, 2017 at 19:36

jeevatkm

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3 Comments

Bazinga Over a year ago

That fixed the error, but the output is like this: {A : [ {X: 1, Y:2 } ] } , {A : [ {X: 1, Y:2 } ] }, {A : [ {X: 1, Y:2 } ] } I am trying to produce something like: {A: {{X:1 ,Y: 2}, {X:2 ,Y: 2}, {X: 2,Y: 2}}}

Bazinga Over a year ago

should it be var bj []B ?

jeevatkm Over a year ago

You're welcome, added golang play link for reference.

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