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dabd/tagged.scala

Created April 4, 2016 10:07
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tagged.scala
implicit def taggedStringFormat[T]: Format[String @@ T] = new Format[String @@ T] {
def reads(json: JsValue): JsResult[String @@ T] = json match {
case JsString(v) => JsSuccess(tag[T](v))
case unknown => JsError(s"String value expected, got: $unknown")
}
def writes(v: String @@ T): JsValue = JsString(v)
}
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