Question

我是Scala + Play的新手。我正在尝试从创建对象mongodb的其他项目中导入代码，但在此之前，代码使用带有隐含的Json验证器。我的对象由两种类型组成：Valunit和CreateDatumRequest。该错误在“隐式val createDatumRequestFmt = Json.format [CreateDatumRequest]”行上，但是说明了上一行中的Valunit对象。

No implicit format for Map[String,Option[nl.amc.ebioscience.rosemary.models.core.Valunit]] available.

@Singleton
class DataController @Inject() (securityService: SecurityService) extends Controller with JsonHelpers {
.....
  case class CreateDatumRequest(
      name: String,
      parent: Option[Datum.Id],
      remarks: Option[String],
      category: Tag.Id, // Datum Category tag
      dict: Map[String, Option[Valunit]]) {

    def validate(workspaceId: Tag.Id): Either[String, Map[DefaultModelBase.Id, BaseEntity]] = {
........
}
  object CreateDatumRequest {
    implicit val valunitFmt = Json.format[Valunit]
    implicit val createDatumRequestFmt = Json.format[CreateDatumRequest]
  }
......
}

Answer 1

尝试为dict: Map[String, Option[Valunit]])定义阅读。您可以在此处阅读更多内容。https://www.playframework.com/documentation/2.5.x/ScalaJsonCombinators#complex-reads

验证Json时出错：没有Map的隐式格式

1 个答案: