Hello guys, I'm getting strange error using ktor-s...

# ktor

[Ivan Pavlov]

Hello guys, I'm getting strange error using ktor-serialization:1.4.0

kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 15: Expected '[, kind: SEALED'
JSON input: {
    "place":{
        "type":"point",
        "lon":22.0,
        "lat":56.7
    }
}

Routing looks like that:

post("/") {
  val body = call.receive<AddVisitDataDto>()
  call.respond(body.toString())
}

My model:

@kotlinx.serialization.Serializable
data class AddVisitDataDto(
    val place: PlaceDto
)

@kotlinx.serialization.Serializable
sealed class PlaceDto {
    @kotlinx.serialization.Serializable
    @SerialName("external")
    data class External(val externalId: String) : PlaceDto()
    @kotlinx.serialization.Serializable
    @SerialName("point")
    data class Point(val lon: Double, val lat: Double) : PlaceDto()
}

When I change receiving to the following code it works fine:

val text = call.receiveText()
val body = Json.decodeFromString<AddVisitDataDto>(text)

I tried to add @Polymorphic to place property but it only changes error to
kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 15: Expected '[, kind: OPEN'

Am I doing something wrong?

[Ivan Pavlov]

Also serialization works like this:

{
"place": [
  "point",
  {
    "lon": 22.0,
    "lat": 56.7
    }
]
}