I'm trying to create a note-taking like app that uses NSPersistentCloudKitContainer and core data.
The store uses the NSMergeByPropertyObjectTrumpMergePolicy, which is fine for almost every property. For example, if the name of a file is changed on two different devices, then it's fine to use the latest value.
The problem is that the note text cannot be overridden by the latest value if it's changed on two devices at once. It needs to be detected as a conflict so the user can choose which version they want to keep.
I can replicate the behavior by turning off wifi on one device and writing content, then writing content on a different device at the same time. When I turn the wifi back on, whichever device saved the changes last completely overrides the other device's text.
What I'd like to accomplish is detect when there is a conflict of text, then create a duplicate file called "Conflicted Copy." Bonus points if someone can tell me how Apple Notes magically merges text without ever creating a conflict. I really only need a simple solution though that prevents data loss.
Any help in the right direction would be appreciated!