Databases
StackOverflow2013
Postsdbo
POPlay 2.1 Json serialization of traits
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPlay 2.1 Json serialization of traits
    primarykey
    data
    text
    <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>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USMarkus Jura
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POPlay 2.1 Json serialization of traits
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POPlay 2.1 Json serialization of traits
      1. USMarkus Jura
      1. VTFavorite
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload