Core Data (After Adding Unique Constraint) : annotation: repairing missing delete propagation for to-many relationship

Question

This issue started occurring after we added Unique key i.es Constraint.

Frequently updating Meeting managed object deletes the event manage

Answer 1

I hope I can help, having a unique constraint with To-Many Relationship Entities you need to keep some points in mind

• Use Inverse Relationship of every CoreData relation
• Unique Constrains Attributes should never be Optional

When you create NSManagedObjectContext make sure you set MergePolicy.

[_context setMergePolicy: mergePolicy];

• NSMergeByPropertyStoreTrumpMergePolicy

• NSMergeByPropertyObjectTrumpMergePolicy

• NSOverwriteMergePolicy

Also could you try changing the nullify delete rule to no action ?