问题描述
我正在尝试使用kotlinx.serialization
和kotlin / native来序列化多态类。我正在使用序列化指南中提供的示例:
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,但在linuxX64
上使用kotlin本机编译并运行时,会引发错误:
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#serializerNotRegistered@kotlin.reflect.KClass<*>(){}kotlin.nothing (0x36fa0d)
at kfun:kotlinx.serialization#serializer@kotlin.reflect.KClass<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均正常工作? 如何使其在本机上工作?
解决方法
我从github issues中发现了它的当前限制。
,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)
是的,这是当前限制,您可以签出Polymorphism documentation here并跟踪问题#1077
,您在定义为 SerializersModule 的子类时错过了为 OwnedProject 类声明序列化程序。
val module = SerializersModule {
polymorphic(Project::class) {
subclass(OwnedProject::class,OwnedProject.serializer()) // add here OwnedProject class serializer
}
}