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你如何使用RootJsonFormat與泛型?通用JSON支持
我必須複製粘貼每一種可能性是這樣的:
trait IDJsonSupport
extends SprayJsonSupport
with DefaultJsonProtocol{
implicit object AddressIDFormat extends RootJsonFormat[ID[Address]] {
override def write(obj: ID[Address]): JsValue = JsNumber(obj.value)
override def read(json: JsValue): ID[Address] = json match {
case JsNumber(id) => new ID[Address](id.toLongExact)
case _ => deserializationError("Address ID expected")
}
}
implicit object CompanyIDFormat extends RootJsonFormat[ID[Company]] {
override def write(obj: ID[Company]): JsValue = JsNumber(obj.value)
override def read(json: JsValue): ID[Company] = json match {
case JsNumber(id) => new ID[Company](id.toLongExact)
case _ => deserializationError("Company ID expected")
}
}
implicit object NoteIDFormat extends RootJsonFormat[ID[Note]] {
override def write(obj: ID[Note]): JsValue = JsNumber(obj.value)
override def read(json: JsValue): ID[Note] = json match {
case JsNumber(id) => new ID[Note](id.toLongExact)
case _ => deserializationError("Note ID expected")
}
}
...
?
此:
implicit object AnyIDFormat extends RootJsonFormat[ID[_]] { ... }
不起作用。
謝謝。我不得不添加TypeTag,它的工作原理! – Etam