Created
August 27, 2019 19:38
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Decode flat ADT with circe
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{ | |
"error": "Some error message", | |
"status": 409 | |
} |
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{ | |
"type": "record", | |
"id": 42, | |
"version": 1 | |
} |
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import io.circe._ | |
import io.circe.generic.semiauto._ | |
sealed trait Response | |
final case class Success(`type`: String, id: Int, version: Int) | |
extends Response | |
object Success { | |
implicit val successDecoder: Decoder[Success] = deriveDecoder[Success] | |
} | |
final case class Error(error: String, status: Int) | |
extends Response | |
object Error { | |
implicit val errorDecoder: Decoder[Error] = deriveDecoder[Error] | |
} | |
object Response { | |
implicit def responseDecoder( | |
implicit decodeError: Decoder[Error], | |
decodeSuccess: Decoder[Success] | |
): Decoder[Response] = new Decoder[Response] { | |
override def apply(cursor: HCursor): Result[Response] = | |
if (cursor.downField("error").succeeded) { | |
decodeError(cursor) | |
} else { | |
decodeSuccess(cursor) | |
} | |
} | |
} |
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