檢查play.api.libs.json.Json中是否存在密鑰

Question

contains類似play.api.libs.json.Json功能

val data=Map("id" -> "240190", "password" -> "password","email" -> "email@domain.com")

data.contains("email")//true


val info=Json.obj("id" -> "240190", "password" -> "password","email" -> "email@domain.com")

現在如何檢查info包含email ？

Answer 1

info.keys.contains("email")

.keys為您提供了一個帶有鍵值的Set ，然后您可以調用contains方法，我不確定是否有更直接的方法。

Answer 2

(info \ "email").asOpt[String].isEmpty

因為asOpt會返回Optional，我們可以進行isEmpty簡單檢查，這樣可以做我們想要的。

Answer 3

(info \ "email").asOpt[String] match {
  case Some(data) => println("here is the value for the key email represented by variable data" + data)
  case None => println("email key is not found") 
}