scala 纯配置枚举

rfbsl7qr 于 5个月前发布在 Scala

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纯配置无法解析conf中的大写字母

sealed trait Occupation extends Product with Serializable

  object Occupation {
    case class Employed(job: String) extends Occupation

    object Employed {
      implicit val employedReader = deriveReader[Employed]
    }

    case object Unemployed extends Occupation {
      implicit val unemployedReader = deriveReader[Unemployed.type]
    }

    case object Student extends Occupation {
      implicit val studentReader = deriveReader[Student.type]
    }

    implicit val occupationReader = deriveReader[Occupation]
  }

  case class WorkingPerson(name: String, surname: String, occupation: Occupation)

  val res = ConfigSource.string("{ name: Isaac, surname: Newton, occupation.type: student }").load[WorkingPerson]

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它可以工作，但我需要像'StudenT'这样的枚举值，如果我这样做，我会得到“ConvertFailure（UnexpectedValueForFieldCoproductHint（Unquoted（“student”））”

scala

来源：https://stackoverflow.com/questions/77585768/pure-config-enum

1条答案

按热度按时间

6rvt4ljy1#

如果你想改变how the field is being read，你需要提供一个hint。
对于密封族，PureConfig提供了一种自定义转换的方法，而无需替换默认的ConfigReader。通过在该密封族的作用域中放置CoproductHint的示例，我们可以自定义如何消除歧义。例如，如果type与case类选项的某个字段冲突，我们可以使用另一个字段。

import pureconfig.generic.FieldCoproductHint
implicit val animalConfHint = new FieldCoproductHint[AnimalConf]("kind")

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FieldCoproductHint也可以用不同的方式写类名。首先，在隐式作用域中定义一个新的FieldCoproductHint：

implicit val animalConfHint = new FieldCoproductHint[AnimalConf]("type") {
  override def fieldValue(name: String) = name.dropRight("Conf".length)
}

型
在本例中，需要添加FieldCoproductHint[Occupation]

implicit val occupationConfHint = new FieldCoproductHint[Occupation]("type") {
  override def fieldValue(name: String) = name
}

型
我创建了一个working example in scastie
你真的需要使用半自动推导吗？你可以得到相同的结果，只是使用自动的。
这里是working example in scatsie

build.sbt个

libraryDependencies += "com.github.pureconfig" %% "pureconfig" % "0.14.0"

型

main.scala个

import pureconfig._
import pureconfig.generic.FieldCoproductHint
import pureconfig.generic.auto._

sealed trait Occupation extends Product with Serializable

implicit val occupationConfHint = new FieldCoproductHint[Occupation]("type") {
  override def fieldValue(name: String) = name
}

object Occupation {
  case class Employed(job: String) extends Occupation
  case object Unemployed extends Occupation
  case object StudenT extends Occupation
}

case class WorkingPerson(name: String, surname: String, occupation: Occupation)

val res = ConfigSource.string("{ name: Isaac, surname: Newton, occupation.type: StudenT }").load[WorkingPerson]
println(res)

型

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scala 纯配置枚举

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