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POPlay 2.1 Json serialization of traits
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  1. POPlay 2.1 Json serialization of traits
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    copied!<p>The experimental "Inception" feature in Play 2.1 (Json.format[...]) only works for case classes (see <a href="https://stackoverflow.com/questions/14145432/play-2-1-json-serialization-for-traits">here</a>). How can I write my custom format implicit for a trait. I have the following construct:</p> <pre><code>sealed trait Plan { def id: String def name: String def apps: Int def users: Int def testruns: Int def price: Int def prio: Int } </code></pre> <p>And the following case classes which are extending the trait Plan.</p> <pre><code>case class Start( id: String = "start", name: String = "Start", apps: Int = 1, users: Int = 1, testruns: Int = 10, price: Int = 99, prio: Int = 30) extends Plan case class Pro( id: String = "pro", name: String = "Pro", apps: Int = 2, users: Int = 5, testruns: Int = 25, price: Int = 299, prio: Int = 20) extends Plan case class Premium( id: String = "premium", name: String = "Premium", apps: Int = -1, users: Int = -1, testruns: Int = -1, price: Int = 799, prio: Int = 10) extends Plan </code></pre> <p>Now I need to write my custom implicit format val in the Plan companion object. I tried:</p> <pre><code>object Plan { implicit val planFormats = ( (__ \ "id").format[String] and (__ \ "name").format[String] and (__ \ "apps").format[Int] and (__ \ "users").format[Int] and (__ \ "testruns").format[Int] and (__ \ "price").format[Int] and (__ \ "prio").format[Int] )(Plan.apply, unlift(Plan.unapply)) } </code></pre> <p>However, a trait hasn't an apply or unapply method. What is the correct way to provide an implicit val for the json serialization in Play 2.1? </p>
 

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