SwiftData Migration

소개

SwiftData schema migrations require precision to avoid data loss, especially when dealing with type changes and complex relationships. This skill provides expert guidance on navigating the architectural constraints of willMigrate and didMigrate through two-stage migration patterns. It equips developers with the blueprints for defining VersionedSchema snapshots, maintaining many-to-many relationships, and utilizing prefetching to optimize performance during the migration process, ensuring robust data transitions on real devices.

주요 기능

• Comprehensive VersionedSchema snapshot definitions
• 60 GitHub stars
• Performance optimization using relationship prefetching
• Two-stage migration patterns for property type transformations
• Workarounds for the willMigrate/didMigrate architectural limitation
• Relationship preservation for one-to-many and many-to-many structures

사용 사례

• Restructuring complex many-to-many relationships during app updates
• Converting model property types while preserving existing user data
• Ensuring migration safety on real devices compared to simulators