Explains SwiftData class inheritance for modeling IS-A relationships.
npx skills add https://github.com/ano4l/SiteRent --skill swiftdata-inheritance-ano4l
Please help me install this Agent Skill. Skill: swiftdata-inheritance Source: https://github.com/ano4l/SiteRent/tree/main/skills/swiftdata/inheritance Command: npx skills add https://github.com/ano4l/SiteRent --skill swiftdata-inheritance-ano4l
Designing and maintaining SwiftData model hierarchies where derived types share common properties but differ in specialized fields; without a clear inheritance approach, migrations are error-prone and queries across types become cumbersome.
Create a minimal SwiftData model that defines a base class with @Model and two subclasses to illustrate querying across the hierarchy.
High-intent search queries and answers about installing and using this skill.
Model class inheritance in SwiftData by declaring a base class with @Model and creating subclasses for specialized fields. You annotate subclasses to establish an IS-A relationship, querying across the type hierarchy while sharing common base properties.
Use SwiftData inheritance when derived types share common properties but need specialized fields and polymorphic querying. Enums or protocols are better when you need variant cases without deep schema relationships or complex migration paths.
Query across a SwiftData model hierarchy by targeting the base class in your fetch descriptor. This allows you to retrieve instances of both the base model and its annotated subclasses, filtering by specialized fields where needed.
Common SwiftData migration pitfalls involve schema changes to base and derived models that break existing data. You must follow best practices for schema evolution, avoiding deep hierarchies and ensuring safe migrations to prevent error-prone data loss.
Configure polymorphic relationships in SwiftData by defining them on the base model class. You maintain correct inverse references by ensuring subclasses inherit the relationship configuration, preserving referential integrity across the hierarchy.
SwiftData enforces specific API patterns for subclass initialization, requiring proper base model declaration and model container setup. You must follow these constraints to ensure subclass annotations and relationship configurations function correctly.
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