Adding a new property to a custom class erases all stored data

[Xedart]

Suppose I have a class

class Document: Codable, DefaultsSerializable { 
    var title: String
}

static var documents: DefaultsKey<[Document]> {return .init("documents", defaultValue: [])}

Then I need to add a new property to the class Document:

class Document: Codable, DefaultsSerializable { 
    var title: String
    var modifiedDate: Date
}

When I do so, all previously stored documents are erased. Is there a way to do something about it?

[sunshinejr]

Hey @Xedart, yeah the migration between versions is kinda tricky. There are few ways of fixing this one, though:

• custom Codable initializer in which you would check if there is a value for modifiedDate, if not then you would add a default value (the fallback is that every type in your app would get these default values if they are missing, even the ones that are not stored in the defaults)
• custom DefaultsBridge based on the provided codable one, that would call a different initializer that could migrate your data in it

[Xedart]

@sunshinejr Yup, custom Codable init solved the issue. Thanks!

[sunshinejr]

@Xedart awesome 🚀