CloudKit CKModifyRecordsOperation给了我一个"保护数据不匹配"

Question

我正在尝试使用CloudKit上传一些记录更改.我正在使用CKModifyRecordsOperation来批量上传设备上已更改的记录.记录都在自定义区域中

由于某种原因,操作不断回来,并告诉我""保护数据不匹配"

这是代码:

- (void)updloadLocalChangesWithCompletionBlock:(void (^)(NSError *error))completionBlock
{
   // Initialize the data
   NSArray *localChanges = self.localChanges;
   NSArray *localDeletions = self.localDeletions;

   // Initialize the database and modify records operation
   CKDatabase *database = [CKContainer defaultContainer].privateCloudDatabase;
   CKModifyRecordsOperation *modifyRecordsOperation = [[CKModifyRecordsOperation alloc] initWithRecordsToSave:localChanges recordIDsToDelete:localDeletions];
   modifyRecordsOperation.savePolicy = CKRecordSaveAllKeys;

   NSLog(@"CLOUDKIT Changes Uploading: %d", localChanges.count);

   // Add the completion block
   modifyRecordsOperation.modifyRecordsCompletionBlock = ^(NSArray *savedRecords, NSArray *deletedRecordIDs, NSError *error) {
       if (error) {
           NSLog(@"[%@] Error pushing local data: %@", self.class, error);
       }

       [self.localChanges removeObjectsInArray:savedRecords];
       [self.localDeletions removeObjectsInArray:deletedRecordIDs];

       completionBlock(error);
   };

   // Start the operation
   [database addOperation:modifyRecordsOperation];
}

这是它给我的错误:

[CloudKitSyncManager] Error Uploading Changes: <CKError 0x156654a0: "Partial Failure" (2/1011); "Failed to modify some records"; partial errors: {
    default-00001:(ZoneName:UserRecordID) = <CKError 0x1550b5a0: "Server Record Changed" (14/2037); "Error saving record <CKRecordID: 0x18080430; default-00001:(ZoneName:UserRecordID)> to server: Protection data didn't match">
}>

Answer 1

如果使用savePolicyof CKRecordSaveIfServerRecordUnchanged,则需要预先获取远程CKRecord(并更新该特定实例)CKModifyRecordsOperation.如果您CKRecord通过CKRecordID匹配分配"本地" 并向上引用它initWithRecordName:,则CloudKit无法将远程更改标记与(缺少的)本地更改标记进行比较,因此它会失败,CKErrorServerRecordChanged并且会出现一些模糊的错误消息:"保护数据没有不匹配.

但是,如果CKRecord根本不存在远程,则服务器记录肯定没有更改,并且保存操作可以继续.此行为是"Save If Not Exists"用例的基础(SQL:INSERT over PRIMARY KEY).如果您分配一个"本地" CKRecord和使用savePolicy的CKRecordSaveIfServerRecordUnchanged,它会插入,但从来没有进行更新.

如果你使用savePolicyof CKRecordSaveAllKeys和CKRecordZoneID ownerNameof CKOwnerDefaultName,你应该能够通过"本地"分配保存(SQL:UPDATE,必要时使用INSERT),通过CKRecord网络保存(预取)行程.

如果没有网络上的(验证)行程,可能无法完成"Save If Exists"用例(SQL:UPDATE over PRIMARY KEY).

一个问题:无法将CKRecordSaveIfServerRecordUnchangedINSERT和CKRecordSaveAllKeysUPDATE同时转换为一个原子事务,因为CloudKit事务CKModifyRecordsOperation跨越多个CKRecord/ CKRecordID实例只跨越一个事务.从哲学上讲,"事务"应该能够跨越多个"操作"(SQL:查询),而不仅仅是多个"记录"(SQL:行).

Answer 2

你的self.localChanges阵列究竟是什么？CKRecord我假设,但您是根据从CloudKit下载的相同CKRecord对象上传的修改记录吗？

当我尝试使用我的本地更改上传新分配的CKRecord并期望它覆盖服务器的副本时,我有一个类似的(虽然不是确切的)错误消息.我通过下载我的项目的远程副本,将更新应用于CloudKit提供给我的CKRecord实例,然后上传它来修复它.