在 CoreData 中使用带有子模型的模型

Question

我正在尝试使用 CoreData 实现缓存。

到目前为止，我一直在存储简单的模型，但是我下面有一个模型包含 CodablePartialUser 和 CodableFeedItemType.

等数据类型

这些类型应该如何在 CoreData 中建模？

我应该使用 Data 类型并以数据格式存储它们吗？

由于 CodableFeedItemType 是一个枚举，我是否应该存储原始值并再次在格式之间转换？

struct CodablePartialUser: Equatable, Codable {
  let userID: String
  let firstName: String
  let lastName: String

  init(userID: String, firstName: String, lastName: String) {
    self.userID = userID
    self.firstName = firstName
    self.lastName = lastName
  }
}

enum CodableFeedItemType: String, Codable {
  case recognition = "RECOGNITION"
  case news = "COMPANY_NEWS"
}

struct CodableFeedItem: Codable {

  let id: String
  let type: CodableFeedItemType
  let createdDate: Date
  let createdBy: CodablePartialUser
  let likesCount: Int
  let commentsCount: Int
  let externalID: String
  let title: String?
  let imageURL: URL?

  init(id: String, type: CodableFeedItemType, createdDate: Date, createdBy: CodablePartialUser, likesCount: Int, commentsCount: Int, externalID: String, title: String?, imageURL: URL?) {
    self.id = id
    self.type = type
    self.createdDate = createdDate
    self.createdBy = createdBy
    self.likesCount = likesCount
    self.commentsCount = commentsCount
    self.externalID = externalID
    self.title = title
    self.imageURL = imageURL

  }
}

Answer 1

对于 CodablePartialUser，您可以通过创建一个名为 "CodablePartialUser"

对于 CodableFeedItemType，您可以像这样使用枚举

enum CodableFeedItemType: String, Codable {
    case recognition = "RECOGNITION"
    case news = "COMPANY_NEWS"
}

extension CodableFeedItemEntity {
    var type: CodableFeedItemType {
        get {
            return CodableFeedItemType(rawValue: typeRaw)!
        }
        set {
            typeRaw = newValue.rawValue
        }
    }
}

在 CoreData 中使用带有子模型的模型

Using models with sub models in CoreData

core-data

swift

codable