Hi, I am using kotlinx.serialization ContentNegotiation and my response have the following hierarchy...

# ktor

[Damien]

Hi, I am using kotlinx.serialization ContentNegotiation and my response have the following hierarchy:

sealed class A () 
data class B(val name) : A()
data class C(val name): A()

My endpoint returns a List<A> and according to https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#sealed-classes I would expect the following format:

[
  {
	"type": "com.A",
	"name": "name"
  }
]

And I am getting this format when Log the response object. Unfortunately, I got another response format when calling the endpoint:

[
  [
	"com.A",
	{
	  "name": "name"
	}
  ]
]

Any ideas why this different format appears when responding with call.respond(object)?

[Ivan Pavlov]

I fixed same behavior by configuring arrayPolymorphism parameter for json configuration in install method. Unfortunately I don't have a laptop so I can't easily find a proper code snippet for this case

[Damien]

I added the configuration, but it didn't solve my problem

[Damien]

Now I fixed it. the value must be changed to false, wich is also the default of kotlinx.serialization in normal usage. Thank you for the hint.