SwiftData subclass model

To create a subclass model in SwiftData, you can start by using the model macro to define your schema. This is a lightweight API that allows you to define your schema with just a few additions to a normal Swift class. Here's a brief overview of the process:

1. Apply the Model Macro: Begin by applying the model macro to your class. This is the fundamental step to make your class a part of the SwiftData model.

2. Define Attributes and Relationships: You can further refine your model by using the attribute macro to specify behaviors on properties and the relationship macro to describe how models relate to one another.

3. Use Index and Unique Macros: To optimize your queries, you can use the index macro to make queries more efficient and the unique macro to ensure that a set of properties has no duplicate entries.

4. Customize the Schema: You can also use the new schema macro to construct compound constraints on persistent models.

For more detailed information, you can refer to the session What’s new in SwiftData (02:11) which covers customizing the schema and using macros in SwiftData.