I am trying to fetch a record with CloudKit and it fails with the following error: "Fetching asset failed" I confirmed (via the CloudKit Dashboard) that the record exists in my public database and the default zone and the default container (not a custom container). Here is my code:
CKContainer *container = [CKContainer defaultContainer];
CKDatabase *publicDatabase = [container publicCloudDatabase];
CKRecordID *artworkRecordID = [[CKRecordID alloc] initWithRecordName:#"1C0DCC08-71D3-4C47-A417-DB92D2EECB67"];
[publicDatabase fetchRecordWithID:artworkRecordID completionHandler:^(CKRecord *artworkRecord, NSError *error) {
if (error) {
// Error handling for failed fetch from public database
}
else {
// Display the fetched record
}
}];
I had a user get this because they weren’t signed in to iCloud in their iPhone Settings.
As you can see in your screenshot the error code is 4 which is a network error
See xcdoc://?url=developer.apple.com/library/ios/documentation/CloudKit/Reference/CloudKit_constants/index.html#//apple_ref/c/tdef/CKErrorCode
Try switching to 3G or WiFi to see if there is different behavior.
If you go to your app settings, is mobile data enabled?
Can you run the code from the simulator?
Related
So I'm having a really weird problem, I suppose I either dont understand how CloudKit works under the hood or I encountered a bug in CloudKit.
So, the issue looks like this:
App initial state:
I have 5 "Package" records, lets call them A, B, C, D, E.
User action
The user will delete "Package" record E and at some later point in time he will press a refresh button which will fetch all current "Package" records from the cloud.
The problem
When the user presses the refresh button, the app will basically look at the existing locally stored "Package" records, and will create a CKQuery with a predicate that should fetch any other records that do not exist locally. The next step is basically calling the [database performQuery: inZoneWithID:completionHandler:] method.
The surprise shows up when I get the results, which contain the "Package" record E that the user previously deleted.
This doesnt seem to be right to me...
The steps I took to debug:
Right after deleting the "Package" record E, I created a CKFetchRecordsOperation and tried to fetch the deleted record. The result was as expected: I got a "Record not found". I'm cool here.
Thinking there might be some delays on the server side, I put a dispatch_after block and launched the same fetch operation I did in point 1 but just after 30 seconds. The result was still as expected: I got the "Record not found" error.
Performed the same test as I did in point 2 but with a delay of 100 seconds and ... surprise, the CKFetchRecordsOperation operation returned the deleted record E package. The weird thing is that somethings it will still return an error, but sometimes will just plainly return the deleted object.
And now the really weird part: This does not happen with record A, B, C and D, the single difference between all theses records are their names. This does not make any sense.
I filled a bug report and the reply I got was this:
This is correct behavior. Queries are eventually consistent so the deletes may not immediately be reflected when querying. Fetching the deleted record by ID via a CKFetchRecordsOperation should return a CKErrorUnknownItem right away.
While this is partially true, this does not seems to be the case with what I'm seeing.
Code
Deleting the record E with name DS2000330803AS, the check CKFetchRecordsOperation operation returns an error with Record not found. All good here.
CKContainer *container = [CKContainer defaultContainer];
CKDatabase *privateDB = [container privateCloudDatabase];
CKRecordID *recordID = [[CKRecordID alloc] initWithRecordName: #"DS2000330803AS"];
CKModifyRecordsOperation *operation = [[CKModifyRecordsOperation alloc] initWithRecordsToSave: nil recordIDsToDelete: #[recordID]];
operation.database = privateDB;
[operation setModifyRecordsCompletionBlock:^(NSArray<CKRecord *> * _Nullable savedRecords,
NSArray<CKRecordID *> * _Nullable deletedRecordIDs,
NSError * _Nullable error) {
CKFetchRecordsOperation *fetchOperation = [[CKFetchRecordsOperation alloc] initWithRecordIDs:#[recordID]];
fetchOperation.database = privateDB;
[fetchOperation setPerRecordCompletionBlock:^(CKRecord * _Nullable record, CKRecordID * _Nullable recordID, NSError * _Nullable error){
NSLog(#"Error: %#", error.localizedDescription);
}];
}];
Placing a NSTimer in my VC just to test the Record deletion, this piece of code will return the deleted record:
[NSTimer scheduledTimerWithTimeInterval:100 repeats:NO block:^(NSTimer * _Nonnull timer) {
CKContainer *container = [CKContainer defaultContainer];
CKDatabase *privateDB = [container privateCloudDatabase];
CKRecordID *recordID = [[CKRecordID alloc] initWithRecordName:#"DS2000330803AS"];
CKFetchRecordsOperation *fetchOperation = [[CKFetchRecordsOperation alloc] initWithRecordIDs: #[recordID]];
fetchOperation.database = privateDB;
[fetchOperation setPerRecordCompletionBlock:^(CKRecord * _Nullable record, CKRecordID * _Nullable recordID, NSError * _Nullable error){
NSLog(#"Error: %#", error.localizedDescription);
}];
[privateDB addOperation: fetchOperation];
}];
The piece of code that fetches all the existing records by pressing a refresh button which the user can press at any time. I simplified this code a bit to just expose the problem, basically the performQuery returns the DS2000330803AS record, and for the sake of testing my sanity, I'm adding a CKFetchRecordsOperation to fetch the record again, which of course does return it without any issues.
CKContainer *container = [CKContainer defaultContainer];
CKDatabase *privateDB = [container privateCloudDatabase];
NSPredicate *predicate = [NSPredicate predicateWithValue: YES];
CKQuery *query = [[CKQuery alloc] initWithRecordType:#"Package" predicate:predicate];
[privateDB performQuery:query
inZoneWithID:nil completionHandler:^(NSArray<CKRecord *> * _Nullable results, NSError * _Nullable error) {
[results enumerateObjectsUsingBlock:^(CKRecord * _Nonnull record, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(#"Record ID: %#", record.recordID);
CKFetchRecordsOperation *fetchOperation = [[CKFetchRecordsOperation alloc] initWithRecordIDs: #[record.recordID]];
fetchOperation.database = privateDB;
[fetchOperation setPerRecordCompletionBlock:^(CKRecord * _Nullable record, CKRecordID * _Nullable recordID, NSError * _Nullable error){
NSLog(#"Error: %#", error.localizedDescription);
}];
[privateDB addOperation: fetchOperation];
}];
}];
Other notes: I removed and commented pretty much everything related to CloudKit and the above code is the only one that interacts with CloudKit. I'm testing with a single device at the moment.
I know the CKQuery can have a better NSPredicate, but now I try to understand why I have this issue.
P.s. When I added the first implementation of CloudKit to my app, I tried to keep it as simple as possible, without any fancy syncing stuff. It worked just fine for a year, then I started getting reports from my users that they cannot delete some records in production.
Any hints guys on how I should further debug this?
Thank you!
I think you are mixing up record Type and record Name(String of CKRecordID). Name is assigned by CloudKit(Typically) and type is set by you. I would bet it was auto assigned but I would have to see how the record was saved. It would be telling to see a screenshot of your CloudKit Dashboard.
In your block of code in
1) you are trying to delete the record name of some record using the record type. That is why you get the error "Record not found"
2) Same as you are still using Record Type and not record name
3) Fetches the record because it is actually using the assigned record.recordID.
This is my gut on the situation. As far as deleting and refreshing please see my answer on stitching records to keep UI and database in sync.
I setup a CKSubscription with the following code:
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"TRUEPREDICATE"];
CKSubscription *subscription = [[CKSubscription alloc] initWithRecordType:#"RecordTypeName"
predicate:predicate
subscriptionID:#"Subscription1"
options:CKSubscriptionOptionsFiresOnRecordCreation | CKSubscriptionOptionsFiresOnRecordUpdate];
CKDatabase *privateDatabase = [[CKContainer defaultContainer] privateCloudDatabase];
[privateDatabase saveSubscription:subscription completionHandler:^(CKSubscription * _Nullable subscription, NSError * _Nullable error) {
if (error) {
NSLog(#"Failed to subscribe.");
}
}];
In application:didReceiveRemoteNotification: I get notified when a new record is added, but I never get notified when an existing record is updated.
I've tried updating records from both the CloudKit dashboard and from another device signed into the same account.
I'm testing on iOS 9 beta 5.
Its a known bug that update notifications are not working.
[CKFetchNotificationChangesOperation sometimes does not return UPDATE, DELETE notifications
[CloudKit push notifications on record update stopped working
[https://forums.developer.apple.com/thread/7288][3]
I building a iOS app using cloudKit. I'm trying to make a batch fetch of the data in cloudKit getting the deltas between the device and cloudKit but it seems like CKFetchRecordChangesOperation doesn't work in public database. Does my only option option is CKQuery to fetch my data ? for example:
CKContainer *container = [CKContainer containerWithIdentifier:containerID];
CKDatabase *publicDatabase = [container publicCloudDatabase];
CKQuery *query = [[CKQuery alloc] initWithRecordType:recordType
predicate:[NSPredicate predicateWithFormat:#"TRUEPREDICATE"]];
CKQueryOperation *queryOp = [[CKQueryOperation alloc] initWithQuery:query];
queryOp.desiredKeys = #[#"record.recordID.recordName"];
queryOp.recordFetchedBlock = ^(CKRecord *record)
{
// do something...
};
queryOp.queryCompletionBlock = ^(CKQueryCursor *cursor, NSError *error)
{
// do something else...
};
queryOp.resultsLimit = CKQueryOperationMaximumResults;
[publicDatabase addOperation:queryOp];
I'll really appreciate your help.
The apple documentation for CKFetchRecordChangesOperation states:
recordZoneID : The zone containing the records you want to fetch. The zone can be a
custom zone. Syncing the default zone is not supported.
This means that it will not work on the public database since than only supports the default zone.
The correct way to achieve the same functionality would be by creating subscriptions for the data you need and retrieve that data using the CKFetchNotificationChangesOperation. Of course you could also just execute some CKQuery commands, but then you would probably often fetch data or execute queries that you don't need.
I have data I'd like to modify in CloudKit. I've found this question (Saving Modified Data in CloudKit) and it points to CKModifyRecordsOperation, but being new to this I'm looking for more guidance. I'm setting my object like so:
[object setValue:number forKey:#"total"];
If I'm only modifying one record and not all do I still call CKModifyRecordsOperation?
Any clues to how this is done?
I've been using [self.cloudManager saveRecord:object]; but with modifying the record this isn't working.
You can fetch, modify, and save changes you make to individual records.
The code snippet below shows how to fetch an Artwork record, changes the date attribute value, and saves it to the database.
// Fetch the record from the database
CKDatabase *publicDatabase = [[CKContainer containerWithIdentifier:containerIdentifier] publicCloudDatabase];
CKRecordID *artworkRecordID = [[CKRecordID alloc] initWithRecordName:#"115"];
[publicDatabase fetchRecordWithID:artworkRecordID completionHandler:^(CKRecord *artworkRecord, NSError *error) {
if (error) {
// Error handling for failed fetch from public database
}
else {
// Modify the record and save it to the database
NSDate *date = artworkRecord[#"date"];
artworkRecord[#"date"]; = [date dateByAddingTimeInterval:30.0 * 60.0];
[publicDatabase saveRecord:artworkRecord completionHandler:^(CKRecord *savedRecord, NSError *saveError) {
// Error handling for failed save to public database
}];
}
}];
Consider to read this article for more detailed information.
I'm trying to request a record from cloudkit with the following code:
CKContainer *myContainer = [CKContainer defaultContainer];
CKDatabase *publicDatabase = [myContainer publicCloudDatabase];
CKDatabase *privateDatabase = [myContainer privateCloudDatabase];
[publicDatabase saveRecord:artworkRecord completionHandler:^(CKRecord *artworkRecord, NSError *error){
if (!error) {
NSLog(#"saved!!!");
CKDatabase *publicDatabase = [[CKContainer containerWithIdentifier:#"Artwork"] publicCloudDatabase];
CKRecordID *artworkRecordID = [[CKRecordID alloc] initWithRecordName:#"115"];
[publicDatabase fetchRecordWithID:artworkRecordID completionHandler:^(CKRecord *artworkRecord, NSError *error) {
if (error) {
NSLog(#"error fetching %#", error);
}
else
{
NSLog(#"loading record %#", artworkRecord );
}
}];
when I make the request I get this error: "errors === <CKError 0x1780533b0: "Internal Error" (1/4000); "Couldn't renew our secure session">"
But the weird thing is I can save more records with no issues.
I'm using a iPad wifi to test this code
I'll really appreciate your help.
This error is incorrectly returned if CloudKit couldn't reach the server to get its configuration. This most commonly happens if you're trying to access a container that hasn't been provisioned by the server or if there's an issue with your network connection.
This was a bug in CloudKit and more recent iOS and OS X releases should provide a better error message in this case.