proposal: encoding/json: Create 'unwrapped' tag to embed fields in json message

[CreatureDev]

Allow marshaling/unmarshaling of non-anonymous structs and interfaces to embed fields in json, equivalent to how anonymous structs are embedded

type Foo struct {
    S string
}

type Bar struct {
    I int 
    F Foo `json:",unwrapped"`
}

func main() {
    var b Bar = Bar{F: Foo{S: "abc"}, I: 123}
    e, _ := json.Marshal(b)
    fmt.Println(string(e))
}

expected output

{ "S": "abc", "I": 123}

[CreatureDev]

Same behavior as the @JsonUnwrapped annotation in the jackson Java library

[wallnutkraken]

Embed the struct
https://go.dev/play/p/AFxdLF9sWLf

[CreatureDev]

That doesn't work for interfaces

[CreatureDev]

You are also unable to create an anonymous field using type parameters

type Bar interface{
}

type Foo[T Bar] struct {
    T
}

throws an error
The only viable solution would be using the proposed tag

type Foo[T Bar] struct {
    Data T `json:",unwrapped"`
}

[dsnet]

Duplicate of #6213.

[knight7024]

hey @CreatureDev, I'm at the same problem. Did you resolve it?