Parsing CloudKit Error (CKError) - ios

Question

I'm using CloudKit and I'm checking if a specific zone was already created.
For this example, let's say that a zone isn't set, so CloudKit retrieves me a CKError.
This CKError has a property called partialErrorsByItemID which is of type [AnyHashable : Error]?
Here's the code:
fileprivate func checkIfZonesWereCreated() {
let privateDB = CKContainer.default().privateCloudDatabase
let op = CKFetchRecordZonesOperation(recordZoneIDs: [zoneID1, zoneID2])
op.fetchRecordZonesCompletionBlock = { (dict, err) in
if let err = err as? CKError, let _err = err.partialErrorsByItemID {
print(_err)
/* prints
[AnyHashable(<CKRecordZoneID: 0x60800003cba0; ownerName=__defaultOwner__, zoneName=TestZone>): <CKError 0x60400005a760: "Zone Not Found" (26/2036); server message = "Zone 'TestZone' does not exist"; uuid = ...-2DF4E13F81E2; container ID = "iCloud.com.someContainer">]
*/
// If I iterate through the dictionary
_err.forEach({ (k, v) in
print("key:", k) // prints: key: <CKRecordZoneID: 0x60800002d9e0; ownerName=__defaultOwner__, zoneName=TestZone>
print("value:", v) // prints: value: <CKError 0x60400005a760: "Zone Not Found" (26/2036); server message = "Zone 'TestZone' does not exist"; uuid = ...-2DF4E13F81E2; container ID = "iCloud.com.someContainer
})
return
}
print("dict:", dict)
}
privateDB.add(op)
}
How do I parse this error? I need to access the zoneName ?

Answer 1

The key in _err is a CKRecordZoneID. Once you have that, use the zoneName property to get the zone name.
I would write your code as follows:
fileprivate func checkIfZonesWereCreated() {
let privateDB = CKContainer.default().privateCloudDatabase
let op = CKFetchRecordZonesOperation(recordZoneIDs: [zoneID1, zoneID2])
op.fetchRecordZonesCompletionBlock = { (dict, err) in
if let err = err as? CKError {
switch err {
case CKError.partialFailure:
if let _err = err.partialErrorsByItemID {
for key in _err.keys {
if let zone = key as? CKRecordZoneID {
let name = zone.zoneName
print("Missing zone: \(name)")
}
}
return
}
default:
break
}
}
print("dict:", dict)
}
privateDB.add(op)
}