Swift -使用decodable将嵌套对象转换为对象数组

Question

我有一个如下格式的JSON，其中有一个学生对象。学生对象中列出了多名学生

Student {
    student1: {
        id: "12",
        name: "jack",
    },
    student2: {
        id: "2323",
        name: "lewis"
    },
    student3: {
        id: "1212",
        name: "pint"
    }
}

我想把它转换成一个学生对象数组，如下所示。我如何使用decodable来做这件事？

struct student: Decodable {
    let name: String
    let id: String
}

Answer 1

也许这就是你想要的：

let json = """
{
  "student": {
      "student1": {
          "id": "12",
          "name": "jack",
      },
      "student2": {
          "id": "2323",
          "name": "lewis"
      },
      "student3": {
          "id": "1212",
          "name": "pint"
      }
  }
}
"""

struct Student: Decodable {
  let id: String
  let name: String
}

struct StudentContainer: Decodable {
  let students: [Student]

  private enum CodingKeys: String, CodingKey {
      case student
  }

  init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)
    let studentsDict = try container.decode([String: Student].self, forKey: .student)
    self.students = studentsDict.map { $0.value }
  }
}

let result = try? JSONDecoder().decode(StudentContainer.self, from: json.data(using: .utf8)!)

Answer 2

抱歉，我读错了一点，所以我再试一次。

要创建一个数组，您可以执行类似以下操作：

struct Students: Codable {
    let students: [Student]
}

struct Student: Codable {
    let name: String
    let id: String
} 

这足以将学生编码到一个数组中。只需使用Students传递JSON数据。

您必须稍微编辑您的JSON，如下所示：

{
    "students": [
        {
            id: "12",
            name: "jack",
        },
        {
            id: "2323",
            name: "lewis"
        },
        {
            id: "1212",
            name: "pint"
        }
    ]
}