json - Play Framework, JSON 重载方法值 [申请]

Question

我已经多次使用 Json Write 和 Read，但是这次出现了一个愚蠢的错误，我在那里找不到任何拼写错误..请在这里帮助我.. ^^

Overloaded method value [apply] cannot be applied to (models.Expense_PIheader => (String, java.util.Date, String, String, Integer))

这是我的案例类:

case class Expense_PIheader(pi_id: String, pi_due_date: Date, supplier_id: String, staff_id: String, status: Integer)

这是我的 JSON:

object Expense_PIheader {
    implicit val ExpensePIheaderWrites: Writes[Expense_PIheader] = (
        (JsPath \ "pi_id").write[String] and
        (JsPath \ "pi_due_date").write[Date] and
        (JsPath \ "supplier_id").write[String] and
        (JsPath \ "staff_id").write[String] and
        (JsPath \ "status").write[Int] 
    )(unlift(Expense_PIheader.unapply))

    implicit val ExpensePIheaderReads: Reads[Expense_PIheader] = (
        (JsPath \ "pi_id").read[String] and
        (JsPath \ "pi_due_date").read[Date] and
        (JsPath \ "supplier_id").read[String] and
        (JsPath \ "staff_id").read[String] and
        (JsPath \ "status").read[Int] 
    )(Expense_PIheader.apply _)
}

Answer 1

您的案例类有一个类型为Integer 的status 字段。

写入和读取需要一个Int 类型的status 字段。

更改一个或另一个以使类型匹配并且它将起作用。