Swift 可编码对象数组

Question

我正在尝试将 Swift 可编码结构呈现给以下 JSON:

{
   "userID": 1000142,
   "emergencyContactData": {"contact": 
       [
           {"firstName": "John"}, 
           {"lastName": "Doe"},
           {"email": "john.doe567@gmail.com"}, 
           {"phone": "12345678901"}
       ]
   }
}

我尝试了以下方法：

struct UserEmergencyContactRequest: Encodable {
    var userID: String
    var ecData: EmergencyContactData
}

struct EmergencyContactData: Encodable {
    var contact: [[String: String]]
}

但是，单个 String:String 字典条目不会呈现为 JSON 对象（没有大括号）。我将如何更改 [String: String] 条目，以便当我将其呈现为 JSON 结构时，单个 String: String 值将包含在一组 JSON 大括号中？

注意：不，我不能改变服务以接受更好的格式，处理遗留服务。

Answer 1

结构正确

我认为问题在于您填充结构的方式（未在您的问题中显示）。

错误

这是我猜您使用的错误代码。

Specifically the error is in the way you are populating the dictionaries value. Infact you are creating a an array with a single dictionary having all the values. Instead you should create an array of dictionaries where each dictionary has 1 single entry.

let dictionaries = [["firstName" : "John", "lastName": "Doe", "email": "john.doe567@gmail.com", "phone": "12345678901"]]
let ecData = EmergencyContactData(contact: dictionaries)
let elm = UserEmergencyContactRequest(userID: "userID", ecData: ecData)

if
    let data = try? JSONEncoder().encode(elm),
    let string = String(data: data, encoding: .utf8) {
    print(string)
}


{"userID":"userID","ecData":{"contact":[{"email":"john.doe567@gmail.com","firstName":"John","lastName":"Doe","phone":"12345678901"}]}}

修复

如上所述，让我们尝试在每个字典中放入 1 个条目。

let dictionaries = [["firstName" : "John"], ["lastName": "Doe"], ["email": "john.doe567@gmail.com"], ["phone": "12345678901"]]

let ecData = EmergencyContactData(contact: dictionaries)
let elm = UserEmergencyContactRequest(userID: "userID", ecData: ecData)

if  let data = try? JSONEncoder().encode(elm),
    let string = String(data: data, encoding: .utf8) {
    print(string)
}

现在我们得到了预期的结果。

{"userID":"userID","ecData":{"contact":[{"firstName":"John"},{"lastName":"Doe"},{"email":"john.doe567@gmail.com"},{"phone":"12345678901"}]}}

Swift 可编码对象数组

Swift Encodable Array of Objects

json

encode

swift

结构正确

错误

修复