My SwiftData Review

My SwiftData Review
SwiftDataの評価に関する私見

Transcript

1. kishikawa katsumi My SwiftData Review SwiftDataͷධՁʹؔ͢Δࢲݟ
2. What Is SwiftData? SwiftDataͱ͸ʁ • Introduced at WWDC 2023 • Data persistence framework • Works great with SwiftUI
3. Tech Event Manager Sample App
4. Tech Event Manager Sample App
5. Address Book Sample App
6. Schema Definition
7. Display the Data
8. What Is SwiftData? SwiftDataͱ͸ʁ • Introduced at WWDC 2023 • Data persistence framework • Works great with SwiftUI • Core Data wrapper 🔑
9. What Is SwiftData? SwiftDataͱ͸ʁ • Introduced at WWDC 2023 • Data persistence framework • Works great with SwiftUI • Core Data wrapper 🔑
10. SwiftData Is Just Wrapper of Core Data SwiftData͸Core DataͷϥούʔϥΠϒϥϦͰ͋Δ • Not reworked Core Data • Provides a more user-friendly API for working with Core Data in Swift • Schemas de fi ned in code • No separate mapping fi le (*.xcdatamodeld) • Type safe queries • Eliminate string-based Key Paths
11. SwiftData Simplifies the Core Data API Core DataͷAPI͕ΑΓγϯϓϦʹ࢖͍΍͘͢ • NSPersistentContainer => ModelContainer • NSManagedObjectModel => PersistentModel • NSManagedObjectContext => ModelContext • NSPredicate => #Predicate • NSPersistentStoreCoordinator => 🗑 • *.xcdatamodeld => 🗑
12. Also brings legacy issues طଘͷ໰୊఺΋ͦͷ··࢒͍ͬͯΔ
13. The issue is Core Data ݁ہͷͱ͜Ζɺ૪఺͸Core Data • For those familiar with Core Data, • Core Data is proven, stable, simple and convenient. • For those unfamiliar with Core Data, • Core Data is di ffi cult to control and is a black box
 that causes mysterious errors and crashes.
14. Why argue for and against Core Data? ͳͥCore DataͷධՁ͕෼͔ΕΔͷ͔ • CoreData is not relational database • However, many expect Core Data to be SQLite ORM
15. Core Data Is Not Relational Database (Nor ORM) Core Data͸Relational DatabaseͰ͸ͳ͍ʢORMͰ΋ͳ͍ʣ • CoreData Is Object Graph Manager
16. Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes.
17. Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes.
18. Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes • Support for data stores other than SQLite (Binary, XML, In-Memory) • SwiftData supports SQLite only. Therefore, it is a wrapper for SQLite.
19. Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes • Support for data stores other than SQLite (Binary, XML, In-Memory) • SwiftData supports SQLite only. Therefore, it is a wrapper for SQLite.
20. Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes • Support for data stores other than SQLite (Binary, XML, In-Memory) • SwiftData supports SQLite only. Therefore, it is a wrapper for SQLite. • Completely di ff erent, technically • CoreData is object graph manager • Object graph is groups of objects form a network through their relationships with each other.
 In short, it is a collection of objects.
21. For Relational Database Many to Many Relations Event Attendee
22. For Relational Database Event Attendee Event-Attendee Many to Many Relations
23. For Core Data
24. For Core Data
25. CoreData Is Not Relational Database CoreData Is Object Graph Manager • Many to Many relationships • No foreign key required
26. All Operations Are on Memory
27. All Operations Are on Memory
28. CoreData Is Not Relational Database All Operations Are on Memory
29. CoreData Is Not Relational Database All Operations Are on Memory
30. CoreData Is Not Relational Database Batch Update
31. CoreData Is Not Relational Database Batch Update
32. CoreData Is Not Relational Database Batch Update
33. CoreData Is Not Relational Database Batch Update
34. CoreData Is Not Relational Database Batch Update
35. CoreData Is Not Relational Database Batch Update
36. Available Data Types อଘͰ͖ΔϓϩύςΟͷܕ • Primitive Types • Int, Float, Double, String, Bool • URL, UUID • Codable
37. Codable Composite Type (Core Data)
38. Codable (Composite) Types Are Queryable CodableܕͰอଘͨ͠σʔλΛݕࡧ৚݅ʹͰ͖Δ
39. Codable (Composite) Types Are Queryable CodableܕͰอଘͨ͠σʔλΛݕࡧ৚݅ʹͰ͖Δ
40. Enums Cannot Be Stored Even If Codable Enum͸CodableͰ͋ͬͯ΋อଘͰ͖ͳ͍
41. Available Data Types อଘͰ͖ΔϓϩύςΟͷܕ • Primitive Types • Int, Float, Double, String, Bool • ❌ CGFloat • URL, UUID • Codable • ❌ Enums
42. Auto Save Is Enabled, No Way to Detect Errors Auto Save͕༗ޮͳͱ͖ɺอଘࣦഊΛ஌Δ͢΂͕ͳ͍ • Seems to work correctly, but data is lost on exit • Migration failures silently erase existing data
43. Compiler Is Silent Despite Unsaved Models อଘͰ͖ͳ͍σʔλϞσϧͰ΋ίϯύΠϧ͕௨Δ
44. Compiler silent despite incomplete initialisers ෆ׬શͳΠχγϟϥΠβͰ΋ίϯύΠϧ͕௨Δ (Runtime Error)
47. #Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍
48. #Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍
49. #Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍
50. #Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍
51. #Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍ • Case Insensitive Search • Su ffi x Search • Date formatting and Compare • Max/Min • Composite Unique Constraint
52. Is SwiftData Production Ready? SwiftData͸࣮༻Մೳ͔ʁ • Depends on how familiar you are with Core Data. • No Fine-Grained CoreData Controls • No Faulting • No Parent/Child Context • No Merge Policy • SwiftData Itself Is Also Incomplete
53. Conclusion ݁࿦ • SwiftDataͷ࠾༻͸৻ॏΛཁ͢Δ • Core Dataͷܦݧ͕ඞཁ • ORMΛٻΊ͍ͯΔͳΒORMΛ୳ͦ͏ • ແ੍ݶʹϢʔβʔ͕σʔλΛ࡞੒͢ΔΑ͏ͳ༻్ʹ͸޲͔ͳ͍ • ͍ͭͰ΋σʔλΛফͤΔΩϟογϡͳͲͰࢼͦ͏
54. Tips