Awesome reply, thanks Tim!
We also have this documented (though for spray-json instead of play-json) in
our docs here:
http://doc.akka.io/docs/akka-stream-and-http-experimental/2.0-M1/scala/http/common/json-support.html
Hope this helps!
--
Cheers,
Konrad 'ktoso’ Malawski
Akka @ Typesafe
On 22 November 2015 at 20:39:50, Tim Harper (timchar...@gmail.com) wrote:
On Saturday, November 21, 2015 at 1:13:01 AM UTC-7, Dennis O wrote:
Hi,
Beginner question on Akka-http 2.
I have a GET route that will expose a value that I need to get from a model.
Inside that model, I have Slick returning a Future.
What is the "Akka-native" way to do this, i.e. Slick giving Future in the
model -> return to router/controller -> expose as Json?
If you don't need to do any additional processing, then the idiomatic way to do
this would be to return the Future to your routes, then just complete.
First, you need to decide on a Json library. I really like PlayJson.
Add your JSON library to build.sbt:
libraryDependencies ++= Seq(
"de.heikoseeberger" %% "akka-http-json4s" % "1.2.1",
"com.typesafe.play" %% "play-json" % "2.4.3"
)
case class User(id: Int, email: String)
object Users {
def get(id: Int): Future[User] = {
// ...
}
}
object JsonFormats {
// Create a read/write serializer for the User case class
implicit val userFormat = Json.format[User]
}
class HttpService {
import JsonFormats._
import de.heikoseeberger.akkahttpplayjson.PlayJsonSupport._
val route =
path("user" / IntValue) { userId =>
val user: Future[User] = Users.get(userId)
complete(user)
}
}
Just like that. The import de.heikoseeberger.akkahttpplayjson.PlayJsonSupport._
tells akka-http to use Play-Json to look for implicit PlayJson formats in
scope, and use them to output Json. Importing JsonFormats._ makes the User Json
format visible to de.heikoseeberger.akkahttpplayjson.PlayJsonSupport.
And also, do we actually need a Future in this case? Won't a standard/blocking
return be appropriate as front-end is waiting for endpoint return anyways (and
btw., waiting with a Promise of its own = in Angular)?
Using a Future in Scala prevents Scala from blocking a thread. It's orthogonal
to whether or not the client is blocking or not.
Thanks!
Dennis
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