How do I define json writer for custom object in Play + Scala?

Question

Could you please demostrate how I can define json writer for my class in Scala and Play Framework 2.1-RC2 ?

The documentation is quite confusing (and will be significant obstacle for wider adoption of Scala/Play by web-developer community). For example not only it's unclear where exactly following code (taken from here) should be located

implicit val taskWrites = (
  (__ \ "id").write[String] ~
  (__ \ "label").write[Boolean] ~
)(unlift(Task.unapply))

but it's also not compilable if I put it inside object definition. Play gives me following error

not found: value __

Here is my Task.scala

http://pastebin.com/hG8F6Gqk

expert · Accepted Answer · 2013-03-28 06:26:39Z

2

Well, turned out the problem was obvious. I forgot to import play.api.libs.functional.syntax._.

answered Mar 28, 2013 at 6:26

expert

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Roch · Accepted Answer · 2013-06-26 12:09:08Z

1

import play.api.libs.json._
import play.api.libs.functional.syntax._

answered Jun 26, 2013 at 12:09

Roch

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Comments

Ryan · Accepted Answer · 2013-03-28 02:50:07Z

-1

The underscore you're using isn't a standard underscore.

Your underscore: __

ASCII Character #95: _

answered Mar 28, 2013 at 2:50

Ryan

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