我正在为Spray框架实现REST api并尝试以漂亮的json格式实现响应
这里有一点代码:
case class Response(msg: String, APIv: String = "", requestNr: String = "")
case class Error(msg: String, errNo: String, exception: String = "")
case class ErrorResponse(error: Error, APIv: String = "", requestNr: String = "")
object Marshallers extends DefaultJsonProtocol with SprayJsonSupport {
implicit val response = jsonFormat3(Response)
implicit val error = jsonFormat3(Error)
implicit val errorResponse = jsonFormat3(ErrorResponse)
}
然后对于get方法我正在使用它:
def getRoute = get {
path("schema" / Segment) { schemaClassShortId : String =>
respondWithMediaType(`application/json`) {
complete(
FakeStorage.service.getSchema(schemaClassShortId) match {
case None => new ErrorResponse(new Error("SchemaClass with ID: ["+schemaClassShortId + "] not found", EC.SchemaClassNotFound))
case Some(schema) => new Response(schema.toString, "APIv-test", "RequestNr-test")
}
)
}
}
}
请注意,case类在构造函数中可能缺少值,例如“Response”类“APIv”或“RequestNr”可能未传递并设置为空 - (“”)
此类会产生拒绝JSON响应:
{
"error": {
"msg": "SchemaClass with ID: [wrongId] not found",
"errNo": "1000",
"exception": ""
},
"APIv": "",
"requestNr": ""
}
但是我想改变两件事:
1)订单
{
"APIv": "",
"error": {
"msg": "SchemaClass with ID: [wrongId] not found",
"errNo": "1000",
"exception": ""
},
"requestNr": ""
}
2)根本不包括空对象
{
"error": {
"msg": "SchemaClass with ID: [wrongId] not found",
"errNo": "1000"
}
}
据我所知,我需要编写自定义Marshaller - 但是我不知道如何做到这一点,因为我对Spray非常新,特别是Scala
请举例说明我的案例?
答案 0 :(得分:1)
如果您想更改json中字段的顺序,只需更改案例类中的顺序。
如果您不想显示空或空的字段,只需使用默认值为None的选项,默认情况下,spray-json不会序列化为None的字段,因此它们不会显示在json中。
case class ErrorResponse(APIv: Option[String] = None, error: Error, requestNr: Option[String] = None)