Why is real-device migration testing emphasized?

Simulators often delete and rebuild databases during development, which can hide schema migration errors that would cause crashes on real user devices during an update.

When should I use Core Data instead of SwiftData?

Use Core Data if you need to support iOS 16 or earlier, require public CloudKit databases, or need advanced custom migration logic not yet available in SwiftData.

Does it support CloudKit integration?

Yes, it includes implementation patterns for NSPersistentCloudKitContainer, including history tracking and remote change notifications.

How does this skill prevent concurrency crashes?

It enforces the 'Golden Rule' of never passing NSManagedObjects across threads, providing specific patterns for passing objectIDs and performing background context operations.

Can I use this for SwiftUI apps?

Absolutely. The skill provides optimized @FetchRequest patterns and prefetching strategies to avoid common performance bottlenecks like N+1 queries.

Core Data & Persistence for xOS

Name: Core Data & Persistence for xOS
Author: CharlesWiltgen

byCharlesWiltgen

•

233

Mobile Development

Manages Core Data implementation, concurrency patterns, and schema migrations for robust iOS and macOS application persistence.

概要

Axiom Core Data is a specialized skill designed to help developers navigate the complexities of Apple's mature object graph and persistence framework. It provides expert guidance on choosing between Core Data and SwiftData, setting up thread-safe stacks, and implementing complex relationship models while strictly adhering to concurrency rules to prevent crashes. From CloudKit integration to advanced schema migration testing, this skill ensures data integrity and performance across all Apple platforms, providing battle-tested patterns for both modern SwiftUI apps and legacy codebases.

主な機能

Optimized SwiftUI fetching patterns and prefetching logic
Detailed relationship modeling and delete rule guidance
Automated CloudKit sync integration and setup
Schema migration checklists and testing protocols
Advanced concurrency patterns and thread-confinement safety
233 GitHub stars

ユースケース

Managing complex database schema evolutions and migrations
Configuring multi-platform CloudKit synchronization for existing apps
Implementing thread-safe background data imports and processing

概要

主な機能

Optimized SwiftUI fetching patterns and prefetching logic
Detailed relationship modeling and delete rule guidance
Automated CloudKit sync integration and setup
Schema migration checklists and testing protocols
Advanced concurrency patterns and thread-confinement safety
233 GitHub stars

ユースケース

Managing complex database schema evolutions and migrations
Configuring multi-platform CloudKit synchronization for existing apps
Implementing thread-safe background data imports and processing