Kotlin-无法序列化多态类.找不到序列化器 [英] Kotlin - Cannot serialize polymorphic classes. No serializer found

问题描述

我正在尝试使用带有kotlin/native的 kotlinx.serialization 来序列化多态类.我正在使用序列化指南中提供的示例:

I am trying to serialize polymorphic classes using kotlinx.serialization with kotlin/native. I am using the sample provided in the serialization guide:

val module = SerializersModule {
    polymorphic(Project::class) {
        subclass(OwnedProject::class)
    }
}

val format = Json { serializersModule = module }

@Serializable
abstract class Project {
    abstract val name: String
}
            
@Serializable
@SerialName("owned")
class OwnedProject(override val name: String, val owner: String) : Project()

fun main() {
    val data: Project = OwnedProject("kotlinx.coroutines", "kotlin")
    println(format.encodeToString(data))
} 

此代码在JVM上运行时有效，但是在针对 linuxX64 的kotlin本机编译并运行时，会引发错误:

This code works when run with JVM, but when compiled and run with kotlin native for linuxX64 it throws an error:

Uncaught Kotlin exception: kotlinx.serialization.SerializationException: Serializer for class 'Project' is not found. Mark the class as @Serializable or provide the serializer explicitly.
    at kfun:kotlin.Throwable#<init>(kotlin.String?){} (0x294767)
    at kfun:kotlin.Exception#<init>(kotlin.String?){} (0x28ea25)
    at kfun:kotlin.RuntimeException#<init>(kotlin.String?){} (0x28e725)
    at kfun:kotlin.IllegalArgumentException#<init>(kotlin.String?){} (0x28e925)
    at kfun:kotlinx.serialization.SerializationException#<init>(kotlin.String?){} (0x350185)
    at kfun:kotlinx.serialization.internal#[e-mail]<*>(){}kotlin.Nothing (0x36fa0d)
    at kfun:kotlinx.serialization#[e-mail]<0:0>(){0§<kotlin.Any>}kotlinx.serialization.KSerializer<0:0> (0x3505c8)
    at kfun:kotlinx.serialization.serializer$serializerByKTypeImpl#internal (0x3512d2)
    at kfun:kotlinx.serialization#serializer(kotlin.reflect.KType){}kotlinx.serialization.KSerializer<kotlin.Any?> (0x3503c8)
    ...

我是否错误地理解代码应该在两个平台上都可以正常工作?如何使其在本机上工作?

Do I understand it incorrectly, that the code should be working on both platforms ? How to make it work on native ?

推荐答案

正如我从

As i found out from github issues its current limitation.

这是当前限制，应予以正确记录(cc @qwwdfsad).请尝试format.encodeToString(PolymorphicSerializer(Project :: class)，data).如果是密封课程，它应该可以工作.如果没有，只需使用format.encodeToString(Project.serializer()，data)

It is a current limitation that should be properly documented (cc @qwwdfsad ). Please try format.encodeToString(PolymorphicSerializer(Project::class), data). In case of sealed classes, it should work. If it doesnt, simply use format.encodeToString(Project.serializer(), data)

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