Scala -解码JSON时忽略case类字段

import io.circe._
import io.circe.generic.semiauto._
import io.circe.parser._

case class MyData(name: String, age: Int)

object MyData {
  implicit val decoder: Decoder[MyData] = deriveDecoder[MyData].map(_.copy())
}

val jsonStr = """{"name": "John", "age": 25, "extraField": "ignore"}"""
val result = decode[MyData](jsonStr)

result match {
  case Right(data) => println(data)
  case Left(error) => println(s"Decoding error: $error")
}

import play.api.libs.json._

case class MyData(name: String, age: Int)

object MyData {
  implicit val reads: Reads[MyData] = (
    (JsPath \ "name").read[String] and
    (JsPath \ "age").read[Int]
  )(MyData.apply _)
}

val jsonStr = """{"name": "John", "age": 25, "extraField": "ignore"}"""
val result = Json.parse(jsonStr).validate[MyData]

result match {
  case JsSuccess(data, _) => println(data)
  case JsError(errors) => println(s"Decoding error: $errors")
}