Sending post with json using spray? - scala

Question

Sorry I can't manage to make this work: I need to add some json to a post, so following the documentation: http://spray.io/documentation/1.1-M8/spray-httpx/request-building/ :
import scala.util.{Success, Failure}
import akka.actor.{Props, ActorSystem}
import spray.can.client.DefaultHttpClient
import spray.client.HttpConduit
import spray.httpx.SprayJsonSupport
import spray.http._
import spray.json.JsonParser._
import spray.json._
import HttpMethods._
import HttpHeaders._
import MediaTypes._
import spray.httpx.RequestBuilding._
import scala.concurrent.ExecutionContext.Implicits.global
...
val req = HttpRequest(method = POST, uri = "/api/1.0/users/ping.json", entity = HttpEntity(`application/json`,"""{ "key"="whatever" }"""))
and it never compiles:
overloaded method value apply with alternatives:
[error] (optionalBody: Option[spray.http.HttpBody])spray.http.HttpEntity <and>
[error] (buffer: Array[Byte])spray.http.HttpEntity <and>
[error] (string: String)spray.http.HttpEntity
[error] cannot be applied to (spray.http.MediaType, String)
[error] val req = HttpRequest(method = POST, uri = "/api/1.0/users/ping.json", entity = HttpEntity(`application/json`,"""{ "key"="whatever"}"""))

Answer 1

Had the same problem and found the solution here:
https://github.com/spray/spray-json/blob/master/src/main/scala/spray/json/AdditionalFormats.scala#L30-41
This finally worked for me:
import spray.httpx.SprayJsonSupport
import spray.json.AdditionalFormats
object Client extends SprayJsonSupport with AdditionalFormats {
val email = "..."
val password = "..."
val pipeline = sendReceive
pipeline(Post("http://something.com/login", s"""{
"email": "$email",
"password": "$password"
}""".asJson.asJsObject))
}

Answer 2

Sorry, but you question is a bit cumbersome, for me at least. If you want to make a POST request in Spray with some Json as HttpEntity, then you should try to do it with Spray-Clients pipelining, it's drop dead simple.
You need to create a simple pipe:
val pipe: HttpRequest => Future[HttpResponse] = sendReceive
and then build a request:
import spray.json.SprayJsonSupport._
pipe(Post("/api/1.0/users/ping", """{ "key"="whatever" }""".asJson))
This will return you a Future with HttpResponse, if you want some specific result, let's say, for example, some confirmation code, then add unmarshall step to your pipe:
val pipe: HttpRequest => Future[ConfCode] = sendReceive ~> unmarshal[ConfCode]

Answer 3

That is what i tried too, but it doesn't work it is telling me that I am missing an implicit:
val pipeline = sendReceive(conduit)
val responseF = pipeline(Post("/api/1.0/users/ping.json", """{ "key": "whatever" }""".asJson))
responseF onComplete { ...
but i always get :
could not find implicit value for evidence parameter of type spray.httpx.marshalling.Marshaller[spray.json.JsValue]
[error] val responseF = pipeline(Post("/api/1.0/users/ping.json", """{ "key": "whatever" }""".asJson))
also the import you have in your previous snapshot does not work.... Am i using a bad version of the library? My sbt settings are:
val sprayVersion = "1.1-M7"
val akkaVersion = "2.1.1"
"io.spray" %% "spray-json" % "1.2.5",
"com.typesafe.akka" %% "akka-actor" % akkaVersion,
"com.typesafe.akka" %% "akka-slf4j" % akkaVersion,
"io.spray" % "spray-client" % sprayVersion,