Created
October 27, 2017 06:07
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途中の一部のstructだけ構造体にマッピングしたい場合
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package main | |
import ( | |
"encoding/json" | |
"fmt" | |
"reflect" | |
) | |
type Field struct { | |
FieldA int `json:"field_a"` | |
FieldB int `json:"field_b"` | |
Fields *OtherField `json:"fields"` // Pointer型にしないと invalid recursive type Field のエラーになる | |
} | |
type OtherField struct { | |
FieldX string `json:"field_x"` | |
FieldY string `json:"field_y"` | |
} | |
func main() { | |
j := ` | |
{ | |
"field_a": 100, | |
"field_b": 200, | |
"fields": { | |
"field_x": "hoge", | |
"field_y": "fuga" | |
} | |
}` | |
var f map[string]interface{} | |
json.Unmarshal([]byte(j), &f) | |
fmt.Printf("%f %f\n", f["field_a"], f["field_b"]) // 100.000000 200.000000 | |
f2, _ := f["fields"].(map[string]interface{}) | |
fmt.Printf("%s %s\n", f2["field_x"], f2["field_y"]) // hoge fuga | |
// もし途中の一部のstructだけ構造体にマッピングしたい場合 | |
fmt.Println(reflect.TypeOf(f2)) // map[string]interface {} | |
tmp, _ := json.Marshal(f2) | |
field := OtherField{} | |
json.Unmarshal(tmp, &field) | |
fmt.Printf("%s %s\n", field.FieldX, field.FieldY) // hoge fuga | |
} |
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