core-data

Core Data 知识路由 Skill：按任务把 NSManagedObject 子类化与 Codegen、NSPersistentContainer 装载、NSManagedObjectContext CRUD、NSFetchRequest 取数、NSDeleteRule 逆关系等主题分发到 knowledge/core-data/ 的 Knowledge Contract。

caglarbaranbora

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最近更新 2026-10-18 16:48:04

分类：开发依赖：纯提示词应用场景：代码生成 / 调试排错 / 概念解释

安装技能

复制下面的话术发给你的 Agent，它会通过 secure-skills 检索并安装该技能。

执行命令安装此 skill： npx secure-skills-cli add caglarbaranbora/apple-agent-kit/core-data

Metadata

name: core-data
description: Route Core Data implementation tasks to the correct Knowledge Contracts -- subclassing NSManagedObject and choosing an .xcdatamodeld Codegen mode (Class Definition/Manual-None/Category+Extension) with @NSManaged properties, standing up NSPersistentContainer via loadPersistentStores(completionHandler:) and viewContext with NSPersistentStoreDescription store options, NSManagedObjectContext CRUD (insertNewObject(forEntityName:into:)/init(context:), delete(_:), save(), perform(_:)/performAndWait(_:), parent), fetching with NSFetchRequest<T>/NSPredicate/NSSortDescriptor/context.fetch(_:)/@FetchRequest, and NSDeleteRule referential integrity. Use when writing @NSManaged public var, NSEntityDescription.insertNewObject(forEntityName:into:), Task(context:), NSPersistentContainer(name:), container.loadPersistentStores { }, container.viewContext, NSPersistentStoreDescription, context.insert(_:)/delete(_:)/save(), context.perform { }/performAndWait { }, context.parent, NSFetchRequest<Item>(entityName:), NSPredicate(format:), NSSortDescriptor(keyPath:ascending:), @FetchRequest(sortDescriptors:)/@FetchRequest(fetchRequest:), or choosing .cascadeDeleteRule/.nullifyDeleteRule/.denyDeleteRule/.noActionDeleteRule and inverseRelationship. v1 is Core Data only -- no NSPersistentCloudKitContainer/CloudKit sync, no lightweight or mapping-model migration (NSMigrationManager, versioned/mapping models), no NSFetchedResultsController, no multi-context concurrency beyond a basic parent-child relationship, and no SwiftData interop (@Model/ModelContainer/ModelContext are a separate domain). Triggers on Core Data, NSManagedObject, NSManagedObjectContext, NSPersistentContainer, NSPersistentStoreDescription, NSEntityDescription, NSFetchRequest, NSPredicate, NSSortDescriptor, @FetchRequest, FetchedResults, NSRelationshipDescription, NSDeleteRule, viewContext, xcdatamodeld, Codegen, @NSManaged.
id: skill.core-data.foundations
title: Core Data — Foundations
version: 1.0.0
status: Approved
artifact_type: skill
domain: Core Data
routes: ["knowledge.core-data.model-definition","knowledge.core-data.persistent-container-setup","knowledge.core-data.managed-object-context-crud","knowledge.core-data.fetching-with-nsfetchrequest","knowledge.core-data.relationships-and-delete-rules"]
related: []
last_updated: "2026-08-08T00:00:00.000Z"

Core Data — Foundations Skill

Purpose

Route Core Data implementation tasks to the minimum required Core Data Knowledge Contracts. v1 scope is subclassing NSManagedObject and choosing an .xcdatamodeld Codegen mode with @NSManaged properties, standing up and loading an NSPersistentContainer, performing CRUD through an NSManagedObjectContext with basic thread confinement and a basic parent-child context relationship, fetching with NSFetchRequest/ @FetchRequest, and NSDeleteRule/inverse-relationship referential integrity -- not CloudKit sync, not migration, not NSFetchedResultsController, not advanced multi-context concurrency, and not SwiftData interop.

Routing

Load only the contracts relevant to the task. All paths relative to knowledge/core-data/.

Subclassing NSManagedObject; choosing a Codegen mode (Class Definition/Category+Extension/Manual-None); declaring @NSManaged attribute or relationship properties; or asking what Xcode's generated code does and doesn't synthesize -> model-definition.md
Constructing NSPersistentContainer(name:); calling loadPersistentStores(completionHandler:) and handling its error; reading viewContext; configuring a store via NSPersistentStoreDescription/persistentStoreDescriptions; or injecting a context with .environment(\.managedObjectContext, ...) -> persistent-container-setup.md
Inserting via NSEntityDescription.insertNewObject(forEntityName:into:) or a generated init(context:); calling delete(_:)/save(); checking hasChanges; wrapping work in perform(_:)/ performAndWait(_:); or setting up a basic parent-child context via parent -> managed-object-context-crud.md
Building an NSFetchRequest<T> with a predicate/sortDescriptors; calling context.fetch(_:); or declaring @FetchRequest in a SwiftUI view -> fetching-with-nsfetchrequest.md
Choosing an NSDeleteRule value (.cascadeDeleteRule/ .nullifyDeleteRule/.denyDeleteRule/.noActionDeleteRule); reasoning about what happens to related objects on delete; or diagnosing a relationship missing its inverseRelationship -> relationships-and-delete-rules.md

Never load more than the contracts relevant to the specific question.

Stop Conditions

Stop and report if the requested topic has no matching Knowledge Contract in knowledge/core-data/ — do not guess or fall back to general knowledge.

NSPersistentCloudKitContainer/CloudKit sync — Deferred
Lightweight and mapping-model migration (NSMigrationManager, versioned/mapping models) — Deferred
NSFetchedResultsController — Deferred; do not fabricate its behavior from fetching-with-nsfetchrequest
Multi-context concurrency beyond one parent-child relationship — Deferred
SwiftData interop or migration (@Model, ModelContainer, ModelContext) — owned by swiftdata; do not answer SwiftData questions from Core Data contracts or fabricate a shared API surface