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swiftdata-architecture

Design testable SwiftData persistence layers for macOS 14 apps.

27|5|Updated Apr 18, 2026
Search Tags:#swift#macos#query-optimization#swiftdata#schema-design#data-persistence#repository-pattern
One-click install
npx skills add https://github.com/bocan/bocan-music --skill swiftdata-architecture-bocan
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swiftdata-architecture
Source: https://github.com/bocan/bocan-music/tree/main/.claude/skills/macos/swiftdata-architecture
Command: npx skills add https://github.com/bocan/bocan-music --skill swiftdata-architecture-bocan

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill eliminates the guesswork and common pitfalls of building SwiftData persistence layers for macOS apps, addressing issues like slow queries, high memory usage, untestable data logic, and fragile schema design.

Core Features & Use Cases

  • Schema Design Guidance: Best practices for @Model classes, relationships, unique constraints, and schema migration for SwiftData.
  • Query & Performance Optimization: Patterns for efficient @Query usage, FetchDescriptor, batch operations, and memory management to avoid UI freezes and crashes with large datasets.
  • Testable Repository Pattern: Protocol-based data abstraction with dependency injection and in-memory mock implementations for unit-testable ViewModels.
  • Use Case: For example, use this Skill to design a normalized schema for a macOS music library app, implement paginated track list queries, and build a testable data layer for tag editing features.

Quick Start

Ask the swiftdata-architecture skill to audit your existing SwiftData implementation for performance bottlenecks, testability gaps, and schema design improvements.

Frequently Asked Questions about swiftdata-architecture

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I optimize slow SwiftData queries in my macOS app?▼

Optimize slow SwiftData queries by applying efficient FetchDescriptor patterns, implementing batch operations, and leveraging background context operations to prevent UI freezes with large datasets.

What is the best way to design a testable SwiftData persistence layer?▼

The best way to design a testable SwiftData layer is implementing the repository pattern with protocol-based data abstraction and dependency injection to support in-memory mock implementations for unit tests.

How does SwiftData schema design handle relationships and migrations?▼

SwiftData schema design manages relationships and migrations through best practices for @Model classes, defining unique constraints, and applying schema migration strategies compatible with macOS 14 and later.

Can I use SwiftData background context operations with SwiftUI?▼

Yes, SwiftData background context operations work with SwiftUI by leveraging modern Swift concurrency to execute data tasks off the main thread, ensuring smooth interface performance.

Why does my SwiftData app freeze when fetching large datasets?▼

Your SwiftData app freezes during large fetches because queries block the main thread; resolving this requires FetchDescriptor batch operations, paginated queries, and background context execution.

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