8000 Enum singleton cases should be optionally serialized to string. · Issue #2033 · circe/circe · GitHub

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Enum singleton cases should be optionally serialized to string. #2033

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liewhite opened this issue Oct 9, 2022 · 1 comment

liewhite commented

enum E {
  case E1
  case E2
}

val e: E = E.E1
println(e.asJson) // expect "E1"  json string here, but current is {"E1":{}}

In most situations, serializing singleton cases to empty object is meaningless. Actually, we want a string const here.

shannonbarnes commented

I found this technique in source code to accomplish this behavior:

import io.circe.derivation.ConfiguredEnumCodec
import io.circe.derivation.Configuration
import io.circe.syntax.*

given Configuration = Configuration.default

enum E derives ConfiguredEnumCodec {
  case E1
  case E2
}

val e: E = E.E1
println(e.asJson) // got "E1"

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