`Codable` 프로토콜을 사용하여 부분적으로 직렬화 된 json 문자열을 부분적으로 디코딩 할 수 있습니까?

Question

어떻게 Codable 프로토콜을 사용하여 부분적으로 이중 직렬화 된 JSON 문자열을 디코딩 할 수 있습니까? 당신이 당신의 이중 인코딩 된 JSON를 해결할 수없는 경우

class Person : Codable { 
     var name : String? 
     var hobby : String? 
    } 
    class Family : Codable { 
     var person: String? 
     var person_: Person? 
    } 
    class PerfectFamily : Codable { 
     var person: Person? 
    } 

    let jsonString = "{\"person\":\"{\\\"name\\\":\\\"Mike\\\",\\\"hobby\\\":\\\"fishing\\\"}\"}" 
    do { 
     // I could do this. 
     let family = try JSONDecoder().decode(Family.self, from: Data(jsonString.utf8)) 
     family.person_ = try JSONDecoder().decode(Person.self, from: Data(family.person!.utf8)) 
     print(family) 

     // However I want to write more simply like this. Do you have some idea? 
     let perfectFamily = try JSONDecoder().decode(PerfectFamily.self, from: Data(jsonString.utf8)) // error 
     print(perfectFamily) 

    } catch { 
     print(error) 
    } 

Answer 1

당신은 당신의 PerfectFamily 클래스에 사용자 지정 디코더 방법을 제공 할 수 있지만 구조체 사용하는 것이 좋습니다 :

---

struct Person: Codable { 
    let name: String 
    let hobby: String 
} 

---

struct PerfectFamily: Codable { 
    let person: Person 
    init(from decoder: Decoder) throws { 
     let container = try decoder.singleValueContainer() 
     let person = try container.decode([String: String].self)["person"] ?? "" 
     self.person = try JSONDecoder().decode(Person.self, from: Data(person.utf8)) 
    } 
} 

을

---

let json = "{\"person\":\"{\\\"name\\\":\\\"Mike\\\",\\\"hobby\\\":\\\"fishing\\\"}\"}" 

do { 
    let person = try JSONDecoder().decode(PerfectFamily.self, from: Data(json.utf8)).person 
    print(person) // "Person(name: "Mike", hobby: "fishing")\n" 
} catch { 
    print(error) 
}