Example model implementation code for the blog post "Flapjack" on O'Reilly's engineering blog.

Pancake.swift

extension Pancake: DataObject {
    // The type of your primary key, if you have one of your own.
    public typealias PrimaryKeyType = String
    // The name of the entity as Core Data knows it.
    public static var representedName: String {
        return "Pancake"
    }
    // The key path to your model's primary key.
    public static var primaryKeyPath: String {
        return #keyPath(identifier)
    }
    // An array of sorting criteria.
    public static var defaultSorters: [SortDescriptor] {
        return [
            SortDescriptor(#keyPath(flavor), ascending: true, caseInsensitive: true),
            SortDescriptor(#keyPath(radius), ascending: false)
        ]
    }
}