I am trying to generate encoders and decoders for two case classes:
object EventBusCases {
case class ValuationRequest(function: RequestValue = ALL_DAY_VALS, interval: RequestValue = IntraDayIntervals.MIN_5)
implicit val requestDecoder: Decoder[ValuationRequest] = deriveDecoder[ValuationRequest]
implicit val requestEncoder: Encoder[ValuationRequest] = deriveEncoder[ValuationRequest]
case class ValuationResponse(values: List[Valuation], function: RequestValue)
implicit val responseDecoder: Decoder[ValuationResponse] = deriveDecoder[ValuationResponse]
implicit val responseEncoder: Encoder[ValuationResponse] = deriveEncoder[ValuationResponse]
}
I keep getting errors like this one, but for both cases:
could not find Lazy implicit value of type io.circe.generic.encoding.DerivedAsObjectEncoder[eventbus.eventBusCases.ValuationResponse]
I decided to also try and derive encoders and decoders for the custom classes inside these ones, such as "Valuation", but I just get the same error on those ones.
I am using Circe 0.12.3
and Scala 2.12.8
and these are my Circe related Scala dependencies:
"com.beachape" %% "enumeratum" % "1.5.14",
"com.beachape" %% "enumeratum-circe" % "1.5.22",
"io.circe" %% "circe-core" % "0.12.3",
"io.circe" %% "circe-generic" % "0.12.3",
"io.circe" %% "circe-parser" % "0.12.3"
So, the way I found to make this work was to implement Encoders and Decoders to both ValuationRequest and ValuationResponse, as well as to all custom types contained in them.
For ValuationRequest and ValuationResponse, I basically added this bit to the same file containing both case classes:
object derivation {
implicit val encodeResponse: Encoder[ValuationResponse] = Encoder.instance {
case response @ ValuationResponse(_,_) => response.asJson
}
implicit val decodeResponse: Decoder[ValuationResponse] =
List[Decoder[ValuationResponse]](
Decoder[ValuationResponse].widen
).reduceLeft(_ or _)
implicit val encodeRequest: Encoder[ValuationRequest] = Encoder.instance {
case response @ ValuationRequest(_,_) => response.asJson
}
implicit val decodeRequest: Decoder[ValuationRequest] =
List[Decoder[ValuationRequest]](
Decoder[ValuationRequest].widen
).reduceLeft(_ or _)
}