Swift CloudKit SaveRecord "Error saving record"

cloudkit, ios, ios8, swift

Solution

A record can be saved to iCloud using CKDatabase's convenience method `saveRecord:` or via a CKModifyRecordsOperation. If it's a single record, you can use `saveRecord:` but will need to fetch the record you'd like to modify using `fetchRecordWithID:` prior to saving it back to iCloud. Otherwise, it will only let you save a record with a new RecordID. More here.

database.fetchRecordWithID(recordId, completionHandler: { record, error in
    if let fetchError = error {
            println("An error occurred in \(fetchError)")
        } else {
            // Modify the record
            record.setObject(newName, forKey: "name")
        } 
}


database.saveRecord(aRecord, completionHandler: { record, error in
    if let saveError = error {
            println("An error occurred in \(saveError)")
        } else {
            // Saved record
        } 
}

The code above is only directionally correct but won't work as is because by the time the completionHandler of fetchRecordWithID returns, saveRecord will have fired already. A simple solution would be to nest saveRecord in the completionHandler of fetchRecordWithID. A probably better solution would be to wrap each call in a `NSBlockOperation` and add them to an NSOperationQueue with saveOperation dependent on fetchOperation.

This part of your code would be for a `CKModifyRecordsOperation` and not needed in case you are only updating a single record:

var ops:CKModifyRecordsOperation = CKModifyRecordsOperation()
ops.savePolicy = CKRecordSavePolicy.IfServerRecordUnchanged
database.addOperation(ops)

If you do use a `CKModifyRecordsOperation` instead, you'll also need to set at least one completion block and deal with errors when conflicts are detected with existing records:

let saveRecordsOperation = CKModifyRecordsOperation()

var ckRecordsArray = [CKRecord]()
// set values to ckRecordsArray

saveRecordsOperation.recordsToSave = ckRecordsArray
saveRecordsOperation.savePolicy = .IfServerRecordUnchanged
saveRecordsOperation.perRecordCompletionBlock { record, error in
    // deal with conflicts
    // set completionHandler of wrapper operation if it's the case
}

saveRecordsOperation.modifyRecordsCompletionBlock { savedRecords, deletedRecordIDs, error in
    // deal with conflicts
    // set completionHandler of wrapper operation if it's the case
}

database.addOperation(saveRecordsOperation)

There isn't much sample code yet besides the CloudKitAtlas demo app, which is in Objective-C. Hope this helps.

Problem

Original source

Related problems

• Saving Modified Data in CloudKit