How to get old and new value of property of NSPropertyDescription

Question

I have a CoreData stack set up, able to retrieve the edit history for specific objects and so forth. I can even identify which property changed. However I'm struggling with getting the old and new value of the property. See my code below. Is this even possible? If so, how?

func apply(_ changeItem: NSPersistentHistoryChange) {
    switch changeItem.changeType {
    case .update:
        guard let updatedProperties = changeItem.updatedProperties else { break }

        updatedProperties.forEach { (property) in
            // Get old and new value here
        }
    case .insert:
        // ...
    }
    // ...

}

Answer 1

Problem I was facing:

• I couldn't identify the record to update in the destination store.

Workaround:

• Use an identifier field in the Entity
• That way you can query based on the identifier and update destination store with the new values
• identifier will not / should not change after insertion