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我正在尝试将 a 保存CKQuerySubscription到公共数据库 - aCKError返回带有以下信息：

[
    "ServerErrorDescription": subscription is duplicate of 'C82E82EF-F373-4D75-A465-65364D8FEB12',
    "CKErrorDescription": Error saving record subscription with id E30DB4D5-2617-4E0D-8CFE-A14538140029 to server: subscription is duplicate of 'C82E82EF-F373-4D75-A465-65364D8FEB12',
    "NSDebugDescription": CKInternalErrorDomain: 2032,
    "NSUnderlyingError": <CKError 0x1c064ec70: "Server Rejected Request" (2032); server message = "subscription is duplicate of 'C82E82EF-F373-4D75-A465-65364D8FEB12'"; uuid = A5290A31-650C-44FC-B1C1-7BCB181291F8; container ID = "iCloud.com.mycompany.myapp">, 
    "NSLocalizedDescription": Error saving record subscription with id E30DB4D5-2617-4E0D-8CFE-A14538140029 to server: subscription is duplicate of 'C82E82EF-F373-4D75-A465-65364D8FEB12', "errorKey": ck1uc5yob, 
    "RequestUUID": A5290A31-650C-44FC-B1C1-7BCB181291F8, 
    "ContainerID": iCloud.com.mycompany.myapp
]

属性ancestorRecord，clientRecord和对象serverRecord都是。CKErrornil

如何从此错误（即C82E82EF-F373-4D75-A465-65364D8FEB12）中获取服务器上存在的查询的 ID。有没有我想念的财产？

4

1 回答 1

1

有几个选项。我倾向于使用fetchAllSubscriptionsWithCompletion处理程序来提取所有订阅，然后解析我感兴趣的订阅，如下所示：

 [publicDatabase fetchAllSubscriptionsWithCompletionHandler:^(NSArray<CKSubscription *> * _Nullable subscriptions, NSError * _Nullable error)
 {  
     for (CKQuerySubscription *sub in subscriptions)
     {
         NSString *predString = [NSString stringWithFormat:@"%@", sub.predicate];
     }
 }];

但是您也可以使用CKFetchSubscriptionsOperation来拉取所有订阅者，或者根据订阅 ID 拉取特定订阅者。在这种情况下，您将创建操作，配置您感兴趣的订阅 ID，将您的后处理代码添加到完成块，然后运行然后运行该操作。

于 2017-12-08T21:34:06.747 回答