Reputation: 7225
I get the following error when I serialize a ZonedDateTime
field in a data class:
Type mismatch: inferred type is KClass<ZonedDateTimeSerializer> but KClass<out KSerializer<*>> was expected
Here is my class:
import com.fasterxml.jackson.datatype.jsr310.ser.ZonedDateTimeSerializer
import kotlinx.serialization.Serializable
import java.time.ZonedDateTime
@Serializable
data class MyClass(
@Serializable(ZonedDateTimeSerializer::class)
val time: ZonedDateTime
)
How can I serialize a ZonedDateTime
in Kotlin?
Upvotes: 7
Views: 4963
Reputation: 7225
Here's what I did:
object KZonedDateTimeSerializer : KSerializer<ZonedDateTime> {
override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("ZonedDateTime", PrimitiveKind.STRING)
override fun serialize(encoder: Encoder, value: ZonedDateTime) {
encoder.encodeString(value.toString())
}
override fun deserialize(decoder: Decoder): ZonedDateTime {
val string = decoder.decodeString()
return ZonedDateTime.parse(string)
}
}
Here's for OffsetDateTime. If you don't specify a formatter, the minute is removed if it is zero:
object KOffsetDateTimeSerializer : KSerializer<OffsetDateTime> {
override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("OffsetDateTime", PrimitiveKind.STRING)
override fun serialize(encoder: Encoder, value: OffsetDateTime) {
val format = DateTimeFormatter.ISO_OFFSET_DATE_TIME
val string = format.format(value)
encoder.encodeString(string)
}
override fun deserialize(decoder: Decoder): OffsetDateTime {
val string = decoder.decodeString()
return OffsetDateTime.parse(string)
}
}
Upvotes: 13