斯卡拉案件有22个领域，但与斯卡拉play-json的问题2.11.5

Question

我们目前使用scala 2.11.5和我的班级1有22个领域。

case class CreateTransactionRequest(name: Option[String], 
            balance: Option[BigDecimal], 
            amount: BigDecimal, 
            currency: String, 
            dueDate: Option[DateTime], 
            orderDate: DateTime, 
            billing: Option[CreateAddressRequest], 
            shipping: Option[CreateAddressRequest], 
            status: String, 
            email: String, 
            paymentMethod: String, 
            paymentTerm: Option[String], 
            deliveryMethod: Option[String], 
            source: String, 
            attachments: Option[String], 
            agent: Option[String], 
            orders: Option[Set[CreateOrderRequest]], 
            otherCharges: Option[Seq[CreateTransactionOtherChargeRequest]], 
            notes: Option[Seq[CreateNoteRequest]], 
            subscribers: Option[Seq[String]], 
            trackingId: Option[String], 
            acquisition: Option[String]) 

implicit val readsCreateTransactionRequest: Reads[CreateTransactionRequest] = Json.reads[CreateTransactionRequest] 

在环顾四周，我碰到一个解决方案并将其应用

val fields1to12: Reads[(Option[String], Option[BigDecimal], BigDecimal, String, Option[DateTime], DateTime, Option[CreateAddressRequest], Option[CreateAddressRequest], String, String, String, Option[String])] = (
    (__ \ "name").read[Option[String]] and 
    (__ \ "balance").read[Option[BigDecimal]] and 
    (__ \ "amount").read[BigDecimal] and 
    (__ \ "currency").read[String] and 
    (__ \ "dueDate").read[Option[DateTime]] and 
    (__ \ "orderDate").read[DateTime] and 
    (__ \ "billing").read[Option[CreateAddressRequest]] and 
    (__ \ "shipping").read[Option[CreateAddressRequest]] and 
    (__ \ "status").read[String] and 
    (__ \ "email").read[String] and 
    (__ \ "paymentMethod").read[String] and 
    (__ \ "paymentTerm").read[Option[String]] 
).tupled 

    val fields13to22: Reads[(Option[String], String, Option[String], Option[String], Option[Set[CreateOrderRequest]], Option[Seq[CreateTransactionOtherChargeRequest]], Option[Seq[CreateNoteRequest]], Option[Seq[String]], Option[String], Option[String])] = (
    (__ \ "deliveryMethod").read[Option[String]] and 
    (__ \ "source").read[String] and 
    (__ \ "attachments").read[Option[String]] and 
    (__ \ "agent").read[Option[String]] and 
    (__ \ "orders").read[Option[Set[CreateOrderRequest]]] and 
    (__ \ "otherCharges").read[Option[Seq[CreateTransactionOtherChargeRequest]]] and 
    (__ \ "notes").read[Option[Seq[CreateNoteRequest]]] and 
    (__ \ "subscribers").read[Option[Seq[String]]] and 
    (__ \ "trackingId").read[Option[String]] and 
    (__ \ "acquisition").read[Option[String]] 
).tupled 

implicit val readsCreateTransactionRequest: Reads[CreateTransactionRequest] = (fields1to12, fields13to22) { 
    case((name, balance, amount, currency, dueDate, orderDate, billing, shipping, status, email, paymentMethod, paymentTerm), (deliveryMethod, source, attachments, agent, orders, otherCharges, notes, subscribers, trackingId, acquisition)) => 
    CreateTransactionRequest(name, balance, amount, currency, dueDate, orderDate, billing, shipping, status, email, paymentMethod, paymentTerm, deliveryMethod, source, attachments, agent, orders, otherCharges, notes, subscribers, trackingId, acquisition) 
    } 

我相信，我按照从这个link尝试。不幸的是，它不工作，我仍然有错误

有人可以建议一些其他的方式来拆分2234字段Read？

Answer 1

虽然没有提供完整的代码，但是我可以在代码中看到一些问题。首先，你写下面的代码：

(__ \ "billing").read[Option[CreateAddressRequest]] 

这里，CreateAddressRequest不是原始类型。所以，你需要编写一个隐含的Writers for CreateAddressRequest。

然后，您的案例类的最大字段是可选的。玩不能手动序列化/反序列化可选字段。所以，你需要有下面的代码。

implicit def optionFormat[T: Format]: Format[Option[T]] = new Format[Option[T]] { 
    override def reads(json: JsValue): JsResult[Option[T]] = json.validateOpt[T] 

    override def writes(o: Option[T]): JsValue = o match { 
     case Some(t) => implicitly[Writes[T]].writes(t) 
     case None => JsNull 
    } 
    } 

而且，游戏也不能序列化/反序列化日期字段。你需要写写日期也。以下是java.util.Date的示例代码。

implicit object DateFormat extends Format[java.util.Date] { 
    val format = new java.text.SimpleDateFormat("yyyy-MM-dd") 
    def reads(json: JsValue): JsResult[java.util.Date] = JsSuccess(format.parse(json.as[String])) 
    def writes(date: java.util.Date): JsString = JsString(format.format(date)) 
    } 

样品已经解释here