kotlin read only var within a sealed data class structure

Question

I have a sealed class like so:

public sealed class DocumentBody {

    public data class Information(
        val Id: String,
        val name: String,
        val sort: Int = 2
    ) : DocumentBody ()

    public data class Location(
        val name: String,
        val address: String? = null,
        val sort: Int = 3
    ) : DocumentBody()

    public data class Rating(
        val name: String,
        val rating: Int,
        val sort: Int = 3
    ) : DocumentBody()
}

for each one of these I want the sort to be defaulted but also not overwritten. Currently this can be overwritten. How can I achieve this within this model?

Answer 1

Try this:

sealed class DocumentBody(
    val sort: Int
) {
    data class Information(
        val Id: String,
        val name: String
    ) : DocumentBody(sort = 2)

    data class Location(
        val name: String,
        val address: String? = null
    ) : DocumentBody(sort = 3)

    data class Rating(
        val name: String,
        val rating: Int
    ) : DocumentBody(sort = 3)
}