我试图将格式拆分为多个元组,以便它可以处理案例类中超过22个字段的情况。然而,我遇到了一个错误“值and不是play.api.libs.json.Format的成员”。我该如何合并一个案例类的多个格式?
val fields1to2: Format[(Int, String)] = (
(__ \ "a").format[Int] and
(__ \ "b").format[String]
).tupled
val fields3to4: Format[(Boolean, List[Int])] = (
(__ \ "c").format[Boolean] and
(__ \ "d").format[List[Int]]
).tupled
implicit val hugeCaseClassReads: Format[Huge] = (
fields1to2 and fields3to4 // "value and is not a member of play.api.libs.json.Format"
) {
case ((a, b), (c, d)) =>
Huge(a, b, c, d)
}