給定以下結(jié)構(gòu)類型，StructA并且StructB嵌入在CompleteStructtype StructA struct { A int `json:"a_a"` B int `json:"a_b"` C int `json:"a_c"`}type StructB struct { A int `json:"b_a"` B int `json:"b_b"`}type CompleteStruct struct { Name string `json:"name"` StructA StructB}這s是一個(gè)新結(jié)構(gòu)。s := CompleteStruct{Name: "Example", StructA: StructA{ A: 1, B: 2, C: 3, }, StructB: StructB{ A: 4, B: 5, },}你如何轉(zhuǎn)化s為下面的json。[ { "name": "Example", "field": "a_a", "value": 1 }, { "name": "Example", "field": "a_b", "value": 2 }, { "name": "Example", "field": "a_c", "value": 3 }, { "name": "Example", "field": "b_a", "value": 4 }, { "name": "Example", "field": "b_b", "value": 5 }]注意：實(shí)際上，CompleteStruct將包含 10 個(gè)或更多嵌入式結(jié)構(gòu)，每個(gè)嵌入式結(jié)構(gòu)將包含 10 個(gè)或更多字段。所以我想要一個(gè)不需要單獨(dú)輸入每個(gè)字段的解決方案，我認(rèn)為這將需要使用反射
2 回答
慕哥9229398
TA貢獻(xiàn)1877條經(jīng)驗(yàn) 獲得超6個(gè)贊
不反思是解決不了的。簡(jiǎn)單示例：
func (u *CompleteStruct) MarshalJSON() ([]byte, error) {
type Result struct {
Name string `json:"name"`
Field string `json:"field"`
Value any `json:"value"`
}
var res []Result
val := reflect.ValueOf(u).Elem()
for i := 0; i < val.NumField(); i++ {
field := val.Field(i)
switch field.Kind() {
case reflect.Struct:
for i := 0; i < field.NumField(); i++ {
tp := field.Type().Field(i)
field := field.Field(i)
res = append(res, Result{
Name: u.Name,
Field: tp.Tag.Get("json"),
Value: field.Interface(),
})
}
}
}
return json.Marshal(res)
}
烙印99
TA貢獻(xiàn)1829條經(jīng)驗(yàn) 獲得超13個(gè)贊
這應(yīng)該給你你想要的結(jié)構(gòu)：
package main
import (
"encoding/json"
"os"
"reflect"
)
type StructA struct {
A int `json:"a_a"`
B int `json:"a_b"`
C int `json:"a_c"`
}
type StructB struct {
A int `json:"b_a"`
B int `json:"b_b"`
}
type CompleteStruct struct {
Name string `json:"name"`
StructA
StructB
}
func main() {
s := CompleteStruct{Name: "Example",
StructA: StructA{
A: 1,
B: 2,
C: 3,
},
StructB: StructB{
A: 4,
B: 5,
},
}
flat(s)
json.NewEncoder(os.Stdout).Encode(results)
}
type resp struct {
Name string `json:"name"`
Field string `json:"field"`
Value any `json:"value"`
}
var globalName string
var results []resp
func flat(s interface{}) {
st := reflect.TypeOf(s)
for i := 0; i < st.NumField(); i++ {
field := st.Field(i)
if field.Type.Kind() == reflect.Struct {
flat(reflect.ValueOf(s).Field(i).Interface())
} else {
name := field.Tag.Get("json")
if name == "name" {
globalName = reflect.ValueOf(s).Field(i).String()
continue
}
results = append(results, resp{Name: globalName, Field: name, Value: reflect.ValueOf(s).Field(i).Interface()})
}
}
}
go run ./main.go | jq '.'
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