对成员 'save(_:completionHandler:)' 的不明确引用以及 CloudKit 保存尝试

Question

在更新参考列表并在此代码块的第一行收到错误后，我试图保存回 CloudKit。

Error: Ambiguous reference to member 'save(_:completionHandler:)'

CKContainer.default().publicCloudDatabase.save(establishment) { [unowned self] record, error in
  DispatchQueue.main.async {
    if let error = error {
      print("error handling to come")
    } else {
      print("success")
    }
  }
}

这位于一个功能中，用户将在其中遵循给定位置（机构）。我们正在获取现有机构及其关注者记录，检查所选用户是否在其中，如果不在列表中，则将其附加到列表中（如果关注者列表为空，则创建它）。

Edit, in case helpful
//Both of these are passed in from the prior view controller
  var establishment: Establishment?
  var loggedInUserID: String?

@objc func addTapped() {
    // in here, we want to take the logged in user's ID and append it to the list of people that want to follow this establishment
    // which is a CK Record Reference
    let userID = CKRecord.ID(recordName: loggedInUserID!)
    var establishmentTemp: Establishment? = establishment
    var followers: [CKRecord.Reference]? = establishmentTemp?.followers

    let reference = CKRecord.Reference(recordID: userID, action: CKRecord_Reference_Action.none)
    if followers != nil {
      if !followers!.contains(reference) {
        establishmentTemp?.followers?.append(reference)
      }
    } else {
      followers = [reference]
      establishmentTemp?.followers = followers
      establishment = establishmentTemp
    }

[这是粘贴在问题顶部的 CKContainer.default..... 保存块所在的位置]

我查看了 'ambiguous reference' 上的各种帖子，但无法找出问题的根源。试图明确设置 establisthmentTemp 和追随者的类型以防出现问题（基于其他相关帖子的解决方案）但没有成功。作为一个相对缺乏经验的新手，我怕是没思路了！

感谢帮助。

Answer 1

记录我想出的解决方案：

两个问题的组合：

我试图保存 CK 记录的更新版本而不是更新
我没有将 CK 记录传递给 save() 调用 - 而是一个自定义对象

(I believe point two was the cause of the 'ambiguous reference to member' error)

我通过将保存尝试（问题中的第一段代码）替换为：

解决了这个问题

//first get the record ID for the current establishment that is to be updated
let establishmentRecordID = establishment?.id
//then fetch the item from CK

CKContainer.default().publicCloudDatabase.fetch(withRecordID: establishmentRecordID!) { updatedRecord, error in
  if let error = error {
    print("error handling to come")
  } else {

//then update the 'people' array with the revised one
    updatedRecord!.setObject(followers as __CKRecordObjCValue?, forKey: "people")
    //then save it    
    CKContainer.default().publicCloudDatabase.save(updatedRecord!) { savedRecord, error in
    }
  }
}

对成员 'save(_:completionHandler:)' 的不明确引用以及 CloudKit 保存尝试

Ambiguous reference to member 'save(_:completionHandler:)' with CloudKit save attempt

swift

cloudkit