我已经定义了我的枚举字段:
object ContractTypeEnum extends Enumeration {
type ContractTypeEnum = Value
val Key1 = Value("key1")
val Key2 = Value("key2")
}
并在scala Postgres
中定义了其映射:
trait EnumImplicit {
implicit val ContractTypeEnumMapper = PostgresDriver.createEnumJdbcType("contract_type", ContractTypeEnum)
}
在我的表的案例类中,我将该列定义为:
contractType: Option[ContractTypeEnum.ContractTypeEnum]
并如下创建其Implicit Formatter
:
implicit val contractTypeFormat = new Format[ContractTypeEnum.ContractTypeEnum] {
def reads(json: JsValue) = JsSuccess(ContractTypeEnum.withName(json.as[String]))
def writes(myEnum: ContractTypeEnum.ContractTypeEnum) = JsString(myEnum.toString)
}
我得到的是以下错误:
Error:(61, 92) No apply function found for scala.Enumeration.Value
implicit val optionFormat: Format[ContractTypeEnum] = Format.optionWithNull(Json.format[ContractTypeEnum])
并且下面的读者/作家也被写成:
object ContractJsonModel {
implicit val ContractJsonModelFormat = {
implicit val optionFormat: Format[ContractTypeEnum] = Format.optionWithNull(Json.format[ContractTypeEnum])
Jsonx.formatCaseClass[ContractJsonModel]
}
}
什么是错误,我应该如何解决?
object ContractTypeEnum extends Enumeration {
type ContractTypeEnum = Value
val Key1 = Value("key1")
val Key2 = Value("key2")
implicit val readsMyEnum = Reads.enumNameReads(ContractTypeEnum)
implicit val writesMyEnum = Writes.enumNameWrites
}
Json.formatEnum
。您可以这样写: