restfulscala / halselhof   0.3.0


A HAL toolkit based on Play-JSON

Scala versions: 2.12 2.11 2.10


A HAL library based on Play-JSON.

Build Status


To use this library, add the following settings to your build definition:

resolvers += "restful-scala" at ""

libraryDependencies += "org.restfulscala" %% "halselhof" % "0.3.0"

libraryDependencies += "" %% "play-json" % "2.6.3"

You need to add the play-json dependency explicitly, as HALselhof assumed it is being provided by your application. If you use this library with the Play framework, play-json should already be on your classpath.

Standalone Example

// Test data which should be reflected in the resource state
case class TestData(total: Int, currency: String, status: String)

// a generated play.api.libs.json.Writes
implicit val testWrites = Json.writes[TestData]

// transfer the resource state into a full HAL resource
val data = TestData(20, "EUR", "shipped")
val resource: HalResource = data.asResource ++
 HalLink("self", "/orders") ++
 HalLink("next", "/orders?page=2") ++
 HalLink("find", "/orders{?id}", templated = true)

// transfer the resource to the Play JSON AST
val json = resource.json


Play Framework Integration

// within a Play Controller HAL resources can be serialized directly and are supported within content negotiation
import play.api.hal._
import play.api.mvc.hal._

def halOrJson = Action { implicit request =>
  render {
    case Accepts.Json() => Ok(Json.obj("foo" -> "bar"))
    case AcceptHal() => Ok(Hal.state(Json.obj("foo" -> "bar")) ++ HalLink("self", "/foo"))

Release Notes

  • 0.3.0: Update to Play 2.6, cross-building for Scala 2.11 and 2.12
  • 0.2.0: Update to Play 2.5, dropping support for Scala 2.10
  • 0.1.0: First release of the library


Tobias Neef, Mike Mazur, Daniel Westheide, Aristotelis Dossas