Created
October 26, 2017 15:46
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Golangで再帰型のJSONをパースする方法
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package main | |
import ( | |
"encoding/json" | |
"fmt" | |
) | |
type Field struct { | |
FieldA int `json:"field_a"` | |
FieldB int `json:"field_b"` | |
Fields *Field `json:"fields"` // Pointer型にしないと invalid recursive type Field のエラーになる | |
} | |
func main() { | |
j1 := ` | |
{ | |
"field_a": 100, | |
"field_b": 200 | |
}` | |
var f1 Field | |
json.Unmarshal([]byte(j1), &f1) | |
fmt.Printf("%v\n", f1) // {100 200 <nil>} | |
j2 := ` | |
{ | |
"field_a": 100, | |
"field_b": 200, | |
"fields": { | |
"field_a": 300, | |
"field_b": 400 | |
} | |
}` | |
var f2 Field | |
json.Unmarshal([]byte(j2), &f2) | |
fmt.Printf("%v\n", f2) // {100 200 0x4211aa2e0} | |
fmt.Printf("%v\n", *f2.Fields) // {300 400 <nil>} | |
} |
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