Scala As (un)marshalling nested Seq collections with Spray JSON

Question

我正在尝试使用 Spray JSON 将下面的 'Seq' 集合编组到具有定义参数的 'BidRequest' 实体中。 Seq 集合大多是嵌套的，因此一些 'Seq' 参数字段也有需要编组的变量集合类型。然后在计算之后，目的是将结果解组为 'BidResponse'.

的实体

执行此操作的最佳方法是什么？

我正在使用 Akka-HTTP、Akka-Streams、Akka-Actor。

序列集合：


      val activeUsers = Seq(
          Campaign(
              id = 1,
              country = "UK",
              targeting = Targeting(
                  targetedSiteIds = Seq("0006a522ce0f4bbbbaa6b3c38cafaa0f") 
                  ),
                  banners = List(
                      Banner(
                          id = 1,
                          src ="https://business.URLTV.com/wp-content/uploads/2020/06/openGraph.jpeg",
                          width = 300,
                          height = 250
                          )
                        ),
                  bid = 5d
                )
            )

BidRequest 案例class：

case class BidRequest(id: String, imp: Option[List[Impression]], site:Site, user: Option[User], device: Option[Device])

BidResponse 案例 class：

case class BidResponse(id: String, bidRequestId: String, price: Double, adid:Option[String], banner: Option[Banner])

另一种情况class是：


case class Campaign(id: Int, country: String, targeting: Targeting, banners: List[Banner], bid: Double)
case class Targeting(targetedSiteIds: Seq[String])
case class Banner(id: Int, src: String, width: Int, height: Int)

case class Impression(id: String, wmin: Option[Int], wmax: Option[Int], w: Option[Int], hmin: Option[Int], hmax: Option[Int], h: Option[Int], bidFloor: Option[Double])
case class Site(id: Int, domain: String)
case class User(id: String, geo: Option[Geo])
case class Device(id: String, geo: Option[Geo])
case class Geo(country: Option[String])

到目前为止，我已经尝试使用下面的代码，但一直收到类型不匹配错误：

import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._
import spray.json.DefaultJsonProtocol._

implicit val resFormat = jsonFormat2(BidResponse)
implicit val bidFormat = jsonFormat1(BidRequest)
implicit val cFormat = jsonFormat1(Campaign)
implicit val tFormat = jsonFormat1(Targeting)
implicit val bFormat = jsonFormat1(Banner)
implicit val iFormat = jsonFormat1(Impression)
implicit val sFormat = jsonFormat1(Site)
implicit val uFormat = jsonFormat1(User)
implicit val dFormat = jsonFormat1(Device)
implicit val gFormat = jsonFormat1(Geo)

Answer 1

Spray JSON 出现类型错误的原因是因为您需要使用相应的 jsonFormatN 方法，具体取决于案例中的参数数量class.

你的情况：

implicit val resFormat = jsonFormat5(BidResponse)
implicit val bidFormat = jsonFormat5(BidRequest)
implicit val cFormat = jsonFormat1(Campaign)
implicit val tFormat = jsonFormat1(Targeting)
implicit val bFormat = jsonFormat4(Banner)
...

Scala As (un)marshalling nested Seq collections with Spray JSON

Scala Akka (un)marshalling nested Seq collections with Spray JSON

scala

akka

akka-stream

akka-http