如何创建泛型方法来解析嵌套的json?

import com.codahale.jerkson.Json

case class ApiResult[T](
                         private val content: Option[String],
                         private val error: Option[Throwable]
                       ) {
  def getRaw: String = this.content.getOrElse("null")

  def get()(implicit m: Manifest[T]): T = {
       Json.parse[T](this.content.get)
  }
  def either(implicit m: Manifest[T]): Either[Throwable, T] = error match {
    case None    => Right(get)
    case Some(e) => Left(e)
  }

}

现在我有了一个singleton,它有一系列方法来访问另一个服务的路由。

object PurchasesTrait extends ApiResource {

def getData(payload: String): ApiResult[ProductPurchaseResponse] = 
r[ProductPurchaseResponse](POST, Url.core + "reports/productspurchased", payload)

 }
}

我有两个案例课,

case类QualifyingProductSummary(upcCode:String,description:Option[String],purchase:Option[Double]) 案例类ProductPurchaseResponse(qualifyingProducts:列表[合格产品],计数:Int)

purchaseTrait.getData(payload) will give me the ApiResult(json, Nnone) 

{"qualifyingProductSummary":[{"upcCode":"6410077902","description":"Mini-Wheats Original","purchase":15.2},{"upcCode":"6410044886","description":"Corn Pops","purchase":13.7},{"upcCode":"041570055830","description":"Unsweetened Vanilla Beverage ","purchase":13.5},{"upcCode":"626027087802","description":"Organic Almond Milk Original","purchase":12.5}],"totalQualifyingProducts":19}

val data = purchaseTrait.getData(payload).either 

当我使用ApiResult中的任何一个时,要从它中获取数据,

它无法在中解析它 因为 合格产品 我希望泛型方法也对其他嵌套的JSON执行相同的操作。