Hi, I have a very cursed json response that I want...

# serialization

[solonovamax]

Hi, I have a very cursed json response that I want to deserialize that looks (roughly) like this (I can send a real-world example json response if you'd like, but there's a lot of other stuff in there I don't care about, and it makes the json very annoying to read as there are several tens of thousands of lines of garbage if you format the json):

{
  "player": {
    "foo": "abcd",
    "bar": "abcd",
    "selected_killstreak_0": "data",
    "selected_killstreak_1": "data",
    "selected_killstreak_2": "data",
    "selected_killstreak_3": "data"
  }
}

and, I would like to deserialize it into a class that looks like the following:

@Serializable
data class Player(
    val foo: String,
    val bar: String,
    val selectedKillStreaks: List<String>
                 )

is this possible? Or, would I have to deserialize it into a class like this:

@Serializable
data class Player(
    val foo: String,
    val bar: String,
    @SerialName("selected_killstreak_0")
    val selectedKillstreak0: String,
    @SerialName("selected_killstreak_1")
    val selectedKillstreak1: String,
    @SerialName("selected_killstreak_2")
    val selectedKillstreak2: String,
    @SerialName("selected_killstreak_3")
    val selectedKillstreak3: String,
                 )

(note: in some cases there will always be a known number of items in the form name_[n], where [n] is the index, however in other cases there are an arbitrary number of items in that same form. I would like to ideally be able to deserialize for an arbitrary length)

yes, I know that this json is very cursed, but there's nothing I can do about it

[Adam S]

that’s pretty cursed! KxS can handle it though, by using a JsonTransformingSerializer

[Adam S]

main.kt.cpp

main.kt.cpp

[solonovamax]

also btw, the selected_killsteak_n values aren't necessarily in order. sometimes they can be in the order, selected_killstreak_2, selected_killstreak_3, selected_killstreak_1, selected_killstreak_0 (because why not!)

[solonovamax]

also, this pattern of name_[n] occurs many times in the json I want to decode, and I'd prefer to avoid having to re-write this every time I need to deserialized a cursed list like this

would there be any way to make it a json transforming serializer for List<T> (it's not always string, and sometimes can be an object) so that I can just do smth like

// ...
@SerialName("selected_killstreak_")
@Serializable(CursedListDeserializer::class)
val selectedKillstreak: List<String>,
// ...

[Adam S]

you could stick a selectedKillStreaks.sortedBy { it.key } in there somewhere to make the sorting work

[Adam S]

you can play around with the PlayerSerializer above to try and make it more generic/reusable. You could make it an abstract class, and the subclasses could re-use the code.

[ephemient]

or if this happens all over your input data, perhaps you could use a custom format