问题描述
我写了这段代码
import io.circe._,io.circe.generic.auto._,io.circe.parser._,io.circe.syntax._,io.circe.generic.extras._
implicit val config: Configuration = Configuration.default
case class Company(name: String)
case class Quote(average: Double)
case class Stats(price: Double)
@ConfiguredJsonCodec case class Bulk(company: Company,@JsonKey("advanced-stats") stats: Stats,quote: Quote)
val input = """{"AAPL": {"company": {"name": "Apple"},"advanced-stats": {"price":10},"quote": {"average":10}}}"""
val parsed = decode[Map[String,Bulk]](input)
当我尝试在 ammonite 中执行此操作时出现错误
cmd5.sc:1: macro annotation could not be expanded (you cannot use a macro annotation in the same compilation run that defines it)
@ConfiguredJsonCodec case class Bulk(company: Company,quote: Quote)
当我将此代码复制粘贴到文件中并尝试编译它时,它会出现编译错误
could not find Lazy implicit value of type io.circe.generic.extras.codec.ConfiguredAsObjectCodec
编辑:感谢下面的答案,代码开始在菊石上工作。当我将其复制粘贴到 Scala 文件中时,它仍然无法编译。我用谷歌搜索并将代码更改为
object DefaultValues {
implicit val useDefaultValues = Configuration.default.withDefaults
}
import DefaultValues._
@ConfiguredJsonCodec
case class Bulk(
company: Company,quote: Quote
)
但它仍然说
could not find Lazy implicit value of type io.circe.generic.extras.codec.ConfiguredAsObjectCodec[Bulk]
解决方法
您是否启用了宏注释? Scala 2.13 需要您可以在 Ammonite 中启用的标志:
interp.configureCompiler(_.settings.YmacroAnnotations.value = true)
在使用 Scala 2.12 及更早版本的 Ammonite 的早期版本中,您必须使用
// replace with Scala version appropriate for your Ammonite
// \/
import $plugin.$ivy.`org.scalamacros:paradise_2.12.11:2.1.1`