Compilation error on nested case classes with the same type

[dbronecki]

The following code:

import pl.iterators.kebs.json.KebsSpray
import spray.json.{DefaultJsonProtocol, JsonFormat}

class KebsTest {
  import ThingProtocol._

  case class Thing(thingId: String, parent: Option[Thing])

  val t = Thing("child", Some(Thing("parent", None)))

  implicitly[JsonFormat[Thing]].write(t)
}

object ThingProtocol extends DefaultJsonProtocol with KebsSpray

Gives error:

[error] (...)/KebsTest.scala:13: diverging implicit expansion for type routers.ThingProtocol.JF[Option[KebsTest.this.Thing]]
[error] starting with macro method jsonFlatFormat in trait KebsSpray
[error]   implicitly[JsonFormat[Thing]].write(t)
[error]             ^
[error] one error found

[marcin-rzeznicki]

I fixed this issue in 938a9c9 . The fix involves new macro - jsonFormatRec[T] which materializes correct recursive lazy RootJsonFormat[T]. Could you please test it? Please check out tests if you want to see how to use it. Thanks!

[dbronecki]

It's working fine. Thanks!

[marcin-rzeznicki]

Thank you!