How does this skill handle Realm's threading model?

It provides specific patterns for converting Realm's manual thread-local instances and DispatchQueue logic into SwiftData's actor-based concurrency and background ModelContexts.

Does it provide a timeline for the migration process?

The guide includes a standard 4-phase migration plan covering planning, development, data migration, and production rollout, typically spanning 4 to 8 weeks.

Can this skill help with complex database relationships?

Yes, it covers one-to-many and many-to-many relationship mapping, including how to translate RealmSwiftCollection types into native Swift arrays with automatic inverse management.

Why is the migration from Realm to SwiftData critical now?

Realm Device Sync is scheduled for deprecation on September 30, 2025. Apps using this service must migrate to an alternative like SwiftData with CloudKit to maintain data synchronization.

Realm to SwiftData Migration Guide

Name: Realm to SwiftData Migration Guide
Author: CharlesWiltgen

byCharlesWiltgen

•

233

Mobile Development

Guides developers through migrating from Realm database to SwiftData with pattern mappings, threading conversion, and CloudKit sync strategies.

About

The axiom-realm-migration-ref skill provides a comprehensive reference and implementation framework for transitioning iOS and Apple platform applications from Realm to SwiftData. Designed to address the critical Realm Device Sync deprecation deadline of September 2025, it offers side-by-side code comparisons, automated threading conversions using Swift actors, and detailed schema migration phases for production-grade apps. Whether you are handling simple data stores or complex relational schemas with CloudKit synchronization, this skill ensures a safe and modern transition to Apple's native persistence framework.

Key Features

Multi-phase migration strategies for transitioning production user data safely
CloudKit synchronization setup and monitoring guides to replace Realm Device Sync
Comprehensive timeline planning to meet the September 2025 deprecation deadline
Detailed mapping of Realm threading models to modern Swift 6 actor-based concurrency
233 GitHub stars
Side-by-side Realm and SwiftData code comparisons for models, relationships, and indexes

Use Cases

Modernizing legacy iOS apps by replacing Realm with native SwiftData persistence
Executing a data migration strategy before the Realm Device Sync sunset date
Refactoring manual background threading to Swift 6 strict concurrency for local storage

About

Key Features

Multi-phase migration strategies for transitioning production user data safely
CloudKit synchronization setup and monitoring guides to replace Realm Device Sync
Comprehensive timeline planning to meet the September 2025 deprecation deadline
Detailed mapping of Realm threading models to modern Swift 6 actor-based concurrency
233 GitHub stars
Side-by-side Realm and SwiftData code comparisons for models, relationships, and indexes

Use Cases

Modernizing legacy iOS apps by replacing Realm with native SwiftData persistence
Executing a data migration strategy before the Realm Device Sync sunset date
Refactoring manual background threading to Swift 6 strict concurrency for local storage