Cloudkit Sync With CoreData Issue with CKModifyOperation

 

Am trying to sync cloudkit and coredata. Have two tables as:

  • Parent
  • Child (Child has a CKReference to Parent. ie Backward reference from child to parent.)

    • Now according to apple this are the steps we must follow.

  • Fetch local changes - Done by maintaining a update variable with every record. say 3-delete, 1-create and 2-update.
  • Upload the local changes to cloud - Here I use CKModifyRecordsOperation and provide the inserted records as one with update value 1 or 3 and 2 as deleted records. (Atomic to avoid inconsistency)
  • Correct the conflicts if any (So here records with greater modification date are chosen and conflicts are resolved.)
  • Fetch server changes (Here any change that are made to server from last change token are fetched with CKFetchChangesOperation)
  • Apply server changes to local()

    • Now say I have 2 devices and have already synced them with following data

  • Parent-1
  • P1-Child1 (references Parent-1)

    • Now in 1 device I delete Parent-1 and P1-Child1 and let it sync to cloud. On cloudkit dashboard i verify that the Parent and child both have been successfully deleted.

    In Device 2, Now I add P1-Child2 another child to previous parent. Consider the above steps

  • LocalChanges :- (P1-Child2)
  • Upload to cloud :- (P1-Child2)
  • Conflicts :- None
  • Fetch changes from cloud :(Inserted :P1-Child2, Deleted:Parent-1,P1-Child1)
  • Apply this to local.

    • P1-Child2 is saved successfully on Cloud without a parent. So now am left with a child record with no parent.

    Can you guys help me in figuring out the right method to solve this. I thought if apple could have given an error on CKModifyOperation as mentioned in its doc then I could know that a parent record does not exist and I can re-save or upload a parent record along with the child.

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