詢問用範例

Go-MarshalJSON-Problem.go

package math

type A struct {
	FieldA1 int32
	FieldA2 int32
}

func (this A) MarshalJSON() ([]byte, error) {
	m := make(map[string]interface{}, 3)
	m["FieldA1"] = this.FieldA1
	m["FieldA2"] = this.FieldA2
	m["FieldATotal"] = this.FieldA1 + this.FieldA2
	
	return json.Marshal(m)
}

type B strcut{
	A
	FieldB1 int32
	FieldB2 int32
}

func (this B) MarshalJSON() ([]byte, error) {
	m := make(map[string]interface{}, 3)
  
	// 有沒有更優雅的做法？More elegant
	m["FieldA1"] = this.A.FieldA1
	m["FieldA2"] = this.A.FieldA2
	m["FieldATotal"] = this.A.FieldA1 + this.A.FieldA2
	
	m["FieldBTotal"] = this.FieldB1 + this.FieldB2
	
	return json.Marshal(m)
}