Lets say I have two struct that are related like this:
type SecretUser struct { UserInfo `json:"userInfo"` Password string `json:"password"` } type UserInfo struct { FirstName string `json:"firstName"` LastName string `json:"lastName"` Email string `json:"email"` } And I receive a JSON in this form:
{ "firstName": "nice", "lastName":"guy", "email":"[email protected]", "password":"abc123" } I want to unmarshall this JSON into a SecretUser. Is there a better way than doing it like this?
func (u *User) UnmarshalJSON(data []byte) error { var objmap map[string]*json.RawMessage var password string var err error err = json.Unmarshal(data, &objmap) if err != nil { return err } if err := json.Unmarshal(data, &u.UserInfo); err != nil { return err } err = json.Unmarshal(*objmap["password"], &password) if err != nil { return err } u.Password = password return nil } Basically, I partially unmarshall the JSON into a UserInfo struct and then read it again to extract the password. I don't want to create another struct for just unmarshalling this JSON cleanly or use an external library (unless it's part of the standard). Is there a more clean/efficient way of doing this, without reading the JSON twice or setting every field manually from a map?
