ios - 返回大集合时 CKQuery 失败

Question

我正在使用 CloudKit 在应用程序启动时下载文件。我有一个 CKQuery 可以找到所有尚未下载的文件。当只有一两个下载时它工作正常，但是当有大量下载时，它会失败并出现错误:

\"Server Rejected Request\" (15/2000); server message = \"Internal server error\";

这发生在设备或模拟器上。

相关代码

    let container = CKContainer(identifier: "iCloud.quaritate.Agni")
    let publicDB = container.publicCloudDatabase
    let privateDB = container.privateCloudDatabase

    let predicate = NSPredicate(format: "NOT (%@ CONTAINS Name)", downloadedTitles)
    let query = CKQuery(recordType: "List", predicate: predicate)
    publicDB.performQuery(query, inZoneWithID: nil, completionHandler: {
        results, error in
        if error != nil{
            //error getting lists
            NSLog("\(error?.description)")
        }else{
            //got lists
        }
    }

编辑
我已经更新我的代码以使用 CKOperationQueue

func getNewWords(){
    let predicate = NSPredicate(format: "NOT (%@ CONTAINS Name)", downloadedTitles)
    let query = CKQuery(recordType: "List", predicate: predicate)

    let queryOperation = CKQueryOperation(query: query)
    let operationQueue = NSOperationQueue()
    self.executeQueryOperation(queryOperation, onOperationQueue: operationQueue)
}

func executeQueryOperation(queryOperation: CKQueryOperation, onOperationQueue operationQueue: NSOperationQueue) {
    NSLog("Executing query operation")
    let container = CKContainer(identifier: "iCloud.quaritate.Agni")
    let publicDB = container.publicCloudDatabase

    queryOperation.database = publicDB

    queryOperation.recordFetchedBlock = {(record:CKRecord) in
        self.saveRecord(record)
    }

    queryOperation.queryCompletionBlock = {(cursor:CKQueryCursor?, error:NSError?)->Void in
        guard error == nil else{
            NSLog("Query error: \(error?.description)")
            return
        }
        if let queryCursor = cursor { //there are more operations to execute
            let queryCursorOperation = CKQueryOperation(cursor: queryCursor)
            self.executeQueryOperation(queryCursorOperation, onOperationQueue: operationQueue)
        }
    }
    operationQueue.addOperation(queryOperation)
}

但仍然收到相同的错误。

Answer 1

仔细检查 downloadedTitles 不是空数组。如果在这样的查询中发送空数组，服务器将返回此错误。

这是服务器的错误错误 - 我已经提交了一个错误，以便在这种情况下返回更好的错误消息(或者根本没有结果)。