swift
Core Data merge conflict between contexts
Core Data.*NSMergeConflict.*for NSManagedObject
Fixes
- 1.Set mergePolicy on the managed object context: NSMergeByPropertyObjectTrumpMergePolicy
- 2.Use NSPersistentContainer's automatic merge configuration
- 3.Refresh the object: context.refresh(object, mergeChanges: true)
ioscore-dataconcurrency
Related Errors
swift3 fixes
SwiftUI preview crash
SwiftUI.*Previews.*crashed.*The preview process was terminated
- •Clean build folder: Cmd+Shift+K, then rebuild
- •Check for force-unwrapped optionals or fatalError in preview code
swift3 fixes
Swift Combine publisher cancelled unexpectedly
Swift.*Combine.*Cancelled.*sink received completion.*failure
- •Store the AnyCancellable in a Set to prevent premature deallocation
- •Use .store(in: &cancellables) to retain the subscription
swift3 fixes
Core Data model incompatible with persistent store
CoreData.*NSInternalInconsistencyException.*model.*incompatible.*store
- •Add a migration mapping model for schema changes
- •Use lightweight migration: addPersistentStore with NSMigratePersistentStoresAutomaticallyOption