Decoding JSON From API - Swift 5

Question

我不擅长为 JOSN 解码构建结构，所以希望得到一些帮助。我有以下 JSON

{
"computer": {
"location": {
"username": "john.smith",
"realname": "john smith",
"real_name": "johnsmith",
"email_address": "[e-mail]",
"position": "somePosition",
"phone": "123-456-7890",
"phone_number": "123-456-7890",
"department": "",
"building": "",
"room": "someRoom01"
}
}
}

我创建了以下结构来保存它：

struct ComputerRecord: Codable {
public let locationRecord: Location
}
struct Location: Codable {
public let record: Record
}
struct Record: Codable {
public let username: String
public let realname: String
public let real_name: String
public let email_address: String
public let position: String
public let phone: String
public let phone_number: String
public let department: String
public let building: String
public let room: String
}

当我尝试解码它并像这样使用它时(带有完成处理程序的较大函数的一部分)：

do {
let decoder = JSONDecoder()
let computer = try decoder.decode(jssComputerRecord.self, from: data)
if  computer.locationRecord.record.username == nameToCheck {
usernameSet(true, response, error)
} else {
print("In the else")
usernameSet(false, response, error)
}
} catch {
print(error)
usernameSet(false, response, error)
}

​

我遇到了问题并收到此错误：

keyNotFound(CodingKeys(stringValue: "locationRecord", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: "locationRecord", intValue: nil) ("locationRecord").", underlyingError: nil))

我认为这是我构造要解码的结构的方式中的一个错误，就好像我打印数据的字符串版本一样，我得到了上面显示的 JSON。

注意：我已经匿名了记录，但保留了确切的结构。

对此的任何帮助都会很棒。

谢谢

卢德斯(编辑)

Answer 1

最重要的规则是：

结构成员的名称必须与 JSON 键匹配，除非您将键映射到CodingKeys

为了符合命名约定，我添加了snake_case转换

struct ComputerRecord: Codable {
public let computer: Computer
}
struct Computer: Codable {
public let location: Record
}
struct Record: Codable {
public let username: String
public let realname: String
public let realName: String
public let emailAddress: String
public let position: String
public let phone: String
public let phoneNumber: String
public let department: String
public let building: String
public let room: String
}

---

do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let result = try decoder.decode(ComputerRecord.self, from: data)
if result.computer.location.username == nameToCheck {
usernameSet(true, response, error)
} else {
print("In the else")
usernameSet(false, response, error)
}
} catch {
print(error)
usernameSet(false, response, error)
}