我正在尝试将POST请求传递给使用Play开发的REST API! (2.5)我想使用Scala Graph的对象(来自图核心依赖)。 看起来这个图已经有了基于lift-json的JSON序列化/反序列化方法,但是我不知道如何插入"插入"进入Play Json库。到目前为止,我使用了隐式转换器(使用Reads / Writes方法),但我想避免为图形部分编写自己的方法,因为它已经是库本身的一部分。
例如,我们说我有这段代码:
import java.util.UUID
import scalax.collection.Graph
case class Task(
id: UUID,
status: String)
case class Stuff(
id: UUID = UUID.randomUUID(),
name: String,
tasks: Option[Graph[Task, DiEdge]])
implicit val stuffWrites: Writes[Stuff] = (
(JsPath \ "id").write[UUID] and
(JsPath \ "name").write[String]
)(unlift(Stuff.unapply))
implicit val stuffReads: Reads[Stuff] = (
(JsPath \ "id").read[UUID] and
(JsPath \ "name").read[String]
)(Stuff.apply _)
implicit val taskWrite: Writes[Task] = (
(JsPath \ "id").write[UUID] and
(JsPath \ "status").write[String]
)(unlift(Task.unapply))
implicit val taskReads: Reads[Task] = (
(JsPath \ "id").read[UUID] and
(JsPath \ "status").read[String]
)(Task.apply _)
我错过了序列化图表和育儿的部分。我应该从头开始重写所有内容,还是可以依赖scalax.collection.io.json中的方法toJson / fromJson?
答案 0 :(得分:1)
由于我努力工作,我想我会分享代码:
class UUIDSerializer extends Serializer[UUID] {
private val UUIDClass = classOf[UUID]
def deserialize(implicit format: Formats): PartialFunction[(TypeInfo, JValue), UUID] = {
case (TypeInfo(UUIDClass, _), json) => json match {
case JString(id) => UUID.fromString(id)
case x => throw new MappingException("Can't convert " + x + " to UUID")
}
}
def serialize(implicit format: Formats): PartialFunction[Any, JValue] = {
case x: UUID => JString(x.toString)
}
}
val extraSerializers = new UUIDSerializer :: Nil
implicit val formats = Serialization.formats(NoTypeHints) ++ extraSerializers
val taskDescriptor = new NodeDescriptor[Task](typeId = "Tasks", customSerializers=extraSerializers) {
def id(node: Any) = node match {
case Task(id, _) => id.toString
}
}
val quickJson = new Descriptor[Task](
defaultNodeDescriptor = taskDescriptor,
defaultEdgeDescriptor = Di.descriptor[Task]()
)
implicit val tasksWrites = new Writes[Graph[Task, DiEdge]] {
def writes(graph: Graph[Task, DiEdge]): JsValue = {
val json = graph.toJson(quickJson)
Json.parse(json.toString)
}
}
implicit val tasksReads = new Reads[Graph[Task, DiEdge]] {
def reads(json: JsValue): JsResult[Graph[Task, DiEdge]] = {
try {
val graph = Graph.fromJson[Task, DiEdge](json.toString, quickJson)
JsSuccess(graph)
}
catch {
case e: Exception =>
JsError(e.toString)
}
}
}
implicit def stuffModelFormat = Jsonx.formatCaseClass[Stuff]
答案 1 :(得分:0)
您可以尝试为您指定格式的案例类编写随播对象。
示例:
object Task {
implicit val taskModelFormat = Json.format[Task]
}
object Stuff {
implicit val staffModelFormat = Json.format[Stuff]
}
代替上述implicits
。使用此解决方案,编译器将为您解析已知的格式化程序,您可能只需要指定缺失/未知类型而不是整个结构。