Immutable SwiftData Model Properties

How to workaround a Swift 6 language mode warning when using SwiftData

Author

Patrick
September 23, 2024

In Swift 5, we could declare a SwiftData Model with a let property and not receive a warning. 

@Model
class Person {
    let yearOfBirth: Int
}

In Swift 6, we now receive the following warning.

Cannot expand accessors on variable declared with 'let'; this is an error in the Swift 6 language mode

Since we want to keep our codebase warning free whilst still minimising unnecessary public access, we can change the let to a private(set) var. 

@Model
class Person {
    private(set) var yearOfBirth: Int
}