golang recursive json to struct? - json

Question

I used to write python, just started to contact golang
my json for example,children unknow numbers,may be three ,may be ten。
[{
"id": 1,
"name": "aaa",
"children": [{
"id": 2,
"name": "bbb",
"children": [{
"id": 3,
"name": "ccc",
"children": [{
"id": 4,
"name": "ddd",
"children": []
}]
}]
}]
}]
i write struct
type AutoGenerated []struct {
ID int `json:"id"`
Name string `json:"name"`
Children []struct {
ID int `json:"id"`
Name string `json:"name"`
Children []struct {
ID int `json:"id"`
Name string `json:"name"`
Children []struct {
ID int `json:"id"`
Name string `json:"name"`
Children []interface{} `json:"children"`
} `json:"children"`
} `json:"children"`
} `json:"children"`
}
but i think this too stupid。
how to optimize？

Answer 1

You can reuse the AutoGenerated type in its definition:
type AutoGenerated []struct {
ID int `json:"id"`
Name string `json:"name"`
Children AutoGenerated `json:"children"`
}
Testing it:
var o AutoGenerated
if err := json.Unmarshal([]byte(src), &o); err != nil {
panic(err)
}
fmt.Println(o)
(src is your JSON input string.)
Output (try it on the Go Playground):
[{1 aaa [{2 bbb [{3 ccc [{4 ddd []}]}]}]}]
Also it's easier to understand and work with if AutoGenerated itself is not a slice:
type AutoGenerated struct {
ID int `json:"id"`
Name string `json:"name"`
Children []AutoGenerated `json:"children"`
}
Then using it / testing it:
var o []AutoGenerated
if err := json.Unmarshal([]byte(src), &o); err != nil {
panic(err)
}
fmt.Println(o)
Outputs the same. Try this one on the Go Playground.