我能够使用可转换键值将 json 数组中的最后一个 guest 字典值作为字典保存到核心数据中，但是其他 guest 字典值未保存。 Guest 现在也在实体上，但我希望将 guest 保存为字典，因为此任务不需要复杂的关系。我确定我正在查看 json，reservation.guest 的值类型 = [AnyHashable: Any]?任何建议都会对我的 json 响应有帮助 https://pastebin.com/J28myW66 , 谢谢

注意:HTTP 请求使用 Alamofire。也没有包括我的整个类(class)，因为这是它的主要部分。 Reservation 和 Guest 都是 NSManagedObject 类

    let managedObjectContext = CoreDataManager.shared.persistentContainer.viewContext

    let reservationEntityDescription = NSEntityDescription.entity(forEntityName: "Reservation", in: managedObjectContext)
    let guestEntityDescription = NSEntityDescription.entity(forEntityName: "Guest", in: managedObjectContext)

    let reservation = Reservation(entity: reservationEntityDescription!, insertInto: managedObjectContext)
    let guest = Guest(entity: guestEntityDescription!, insertInto: managedObjectContext)


    let url = "\(serverEndpoint)\(path)"

    manager?.request(
        url
        ).responseJSON { responseData in

            if(responseData.result.error != nil) {

                print(responseData.response)
            }
            else if responseData.result.value != nil{


                let json = JSON(responseData.result.value!)

               let content = json["data"]

                    var reservationArray: [String] = []
                    if let dates = content.array {
                        for item in dates {
                            if let str = item["date_time"].string {
                                reservationArray.append(str)
                                print(reservationArray)
                            }
                        }

                    }

                    for (key,obj) in content {

                        let guestData = obj["guest"]
                        let guestDict = guestData.dictionaryObject!

                        reservation.guest = guestDict
                        reservation.id = obj["id"].stringValue
                        reservation.dateTime = obj["date_time"].date
                        reservation.startTime = obj["start_time"].time 
                        reservation.numOfPeople = obj["number_of_people"].intValue as NSNumber?
                        reservation.status = obj["status"].stringValue
                        reservation.tables = obj["tables"].arrayObject as! [NSString]?
                        reservation.reservationCollections = reservationArray as [NSString]?

                        guest.id = guestData["id"].stringValue
                        guest.email = guestData["email"].stringValue
                        guest.name = guestData["full_name"].stringValue
                        guest.phone = guestData["phone"].stringValue
                        guest.notes = guestData["notes"].stringValue

                    }
                     print("Reservation to be saved\(reservation)")
                     print("Guest to be saved: \(guest)")
             }
       }

               do {
                    try reservation.managedObjectContext?.save()

                    } catch let error as NSError {

                        fatalError(error.localizedDescription)

                    }

                do {
                    try guest.managedObjectContext?.save()

                } catch let error as NSError {

                    fatalError(error.localizedDescription)

                }

câu trả lời hay nhất

当您的代码开始时，您创建Guest của一个 实例和Reservation của一个 实例:

let reservation = Reservation(entity: reservationEntityDescription!, insertInto: managedObjectContext)
let guest = Guest(entity: guestEntityDescription!, insertInto: managedObjectContext)

在那之后，您再也不会创建任何其他实例。在你的循环中，你为这个实例赋值:

reservation.guest = guestDict
reservation.id = obj["id"].stringValue
...

guest.id = guestData["id"].stringValue
guest.email = guestData["email"].stringValue
...

但是因为只有一个实例，所以只有最后一次循环被保存。第一次通过循环时，您将值分配给 guest Và reservation。每隔一段时间，您都会用新值覆盖以前的值。

如果你想为每一次循环都保存一个新的实例，你需要每次都创建新的实例。在循环内移动 let guest = ... Và let reservation = ... 行。

关于ios - 将 json 字典保存到核心数据 Swift 3，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43577417/