realm-persistence

Implement thread-safe Realm access patterns for iOS Swift Concurrency apps.

3|2|Updated Jan 18, 2026
One-click install
npx skills add https://github.com/dagba/ios-mcp --skill realm-persistence
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: realm-persistence
Source: https://github.com/dagba/ios-mcp/tree/main/skills/realm-persistence
Command: npx skills add https://github.com/dagba/ios-mcp --skill realm-persistence

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Realm's thread-confinement model conflicts with Swift Concurrency, leading to crashes and hard-to-debug issues. This skill provides safe patterns (Actor-based fresh Realm, @MainActor usage, and proper autorelease pools) to write robust Realm code for iOS apps.

Core Features & Use Cases

  • Actor + Fresh Realm: Create a new Realm per operation inside an actor to prevent cross-thread access.
  • @MainActor Pattern: For UIKit apps with small datasets, perform reads/writes on the main thread using a single Realm instance.
  • Background Thread with Autorelease Pool: Safely run Realm work on background threads by wrapping in an autorelease pool.
  • DTO Pattern for Codable APIs: Use DTOs to keep Realm models separate from network or persistence APIs.

Quick Start

Use the realm-persistence skill to implement a thread-safe Realm usage pattern by using a fresh Realm per operation within an Actor.

Frequently Asked Questions about realm-persistence

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

FAQPage Schema
How do I fix Realm threading crashes when using Swift Concurrency?▼

Fix Realm threading crashes in Swift Concurrency by applying safe patterns like creating a fresh Realm per operation inside actors, using @MainActor for simple workflows, and wrapping background tasks in autorelease pools.

What is the best way to access Realm from a Swift actor?▼

The best way to access Realm from a Swift actor is creating a fresh Realm instance per operation inside the actor, which enforces thread confinement and prevents cross-thread access violations.

Can I use Realm on the @MainActor for simple iOS workflows?▼

Yes, you can use Realm on the @MainActor for simple iOS workflows, particularly in UIKit apps with small datasets, by performing reads and writes on the main thread using a single Realm instance.

How do I run Realm batch writes safely on a background thread?▼

Run Realm batch writes safely on a background thread by wrapping the operations in an explicit autorelease pool, ensuring proper memory management and preventing threading conflicts.

Why does my Realm model conflict with my Codable network API?▼

Realm models conflict with Codable APIs because persistence schemas and network DTOs have different requirements; using a separate DTO pattern keeps Realm models isolated from network or persistence APIs.

Does this Realm concurrency pattern require any external dependencies?▼

No, this Realm concurrency pattern requires no external dependencies, relying solely on native Swift Concurrency features like actors, @MainActor, and autorelease pools to ensure thread-safe database access.