[英]How can I decode partially double serialized json string using `Codable` protocol?
如何使用Codable
協議解碼部分雙序列化的 json 字符串?
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)
}
如果您無法修復雙重編碼的 json,您可以向 PerfectFamily 類提供您自己的自定義解碼器方法,但我建議使用結構:
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))
}
}
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)
}
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