When trying to implement (copy & paste really...) the <a href="https://github.com/

Here's an example: <a href="https://github.com/hekmekk/enumeratum-json4s-type-mismatch

enumeratum-json4s ValueEnum example broken? about enumeratum HOT 4 CLOSED

lloydmeta commented on July 17, 2024

enumeratum-json4s ValueEnum example broken?

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Comments (4)

hekmekk commented on July 17, 2024 1

I see. Completely overlooked the imports -.-
Thanks 👍

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lloydmeta commented on July 17, 2024

Strange, I just threw the example into Ammonite (Scala 2.12.4) and it seem to work fine.

Can you put up a small repo?

Loading...
Welcome to the Ammonite Repl 1.0.3
(Scala 2.12.4 Java 1.8.0_152)
If you like Ammonite, please support our development at www.patreon.com/lihaoyi
@ import $ivy.`com.beachape::enumeratum-json4s:1.5.13`
import $ivy.$

@ import enumeratum.values._
import enumeratum.values._

@ {
  sealed abstract class Device(val value: Short) extends ShortEnumEntry
  case object Device
    extends ShortEnum[Device] /* nothing extra here */  {
    case object Phone   extends Device(1)
    case object Laptop  extends Device(2)
    case object Desktop extends Device(3)
    case object Tablet  extends Device(4)

    val values = findValues
  }
  }
defined class Device
defined object Device

@ import org.json4s.DefaultFormats

import org.json4s.DefaultFormats

@

@ implicit val formats = DefaultFormats + Json4s.serializer(Device)
formats: org.json4s.Formats = org.json4s.Formats$$anon$3@3c3357c7

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hekmekk commented on July 17, 2024

Here's an example: https://github.com/hekmekk/enumeratum-json4s-type-mismatch

Thanks for that quick reaction. Hope it's just me missing smth.

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lloydmeta commented on July 17, 2024

Ah, ok this is caused by using the wrong Json4s.serializer. There are 2, one for Enum and another for ValueEnum.

I know it can get confusing when you are mixing Enum with ValueEnum, but for various reasons, those two things aren't exactly the same thing, even though we try hard to make their APIs align 😅

See hekmekk/enumeratum-json4s-type-mismatch#1 for how you might fix this in your project.

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