How to make a simple Json Post with Stpray

[Maatary Okouya]

I'M GETTING THE FOLLOWING ERROR

[error] ...../IdeaProjects/PoolpartyConnector/src/main/scala/org/iadb/poolpartyconnector/thesaurusoperation/ThesaurusCacheService.scala:172: could not find implicit value for evidence parameter of type spray.httpx.marshalling.Marshaller[spray.json.JsValue]

[error]     val request            = Post(s"$thesaurusapiEndpoint/$coreProjectId/suggestFreeConcept?", suggestionJsonBody)

For the following code: 

override def createSuggestedFreeConcept(suggestedPrefLabel: String, lang: String, scheme: String, b: Boolean): String = {

  import system.dispatcher
  import spray.json._

  val pipeline      = addCredentials(BasicHttpCredentials("admin", "admin")) ~> sendReceive


  val label              = LanguageLiteral(suggestedPrefLabel, lang)
  val suggestion         = SuggestFreeConcept(List(label), b, Some(List(scheme)), None, None,None, None)
  val suggestionJsonBody = suggestion.toJson

  val request            = Post(s"$thesaurusapiEndpoint/$coreProjectId/suggestFreeConcept?", suggestionJsonBody)

  val res                = pipeline(request)

  getSuggestedFromFutureHttpResponse(res) match {

    case None => ""
    case Some(e) => e

  }

[Maatary Okouya]

How can create a json HttpEntity that comes with a marshaller ?

[Age Mooij]

If you want Marshallers for raw spray-json AST nodes (i.e. JsObject and JsArray), you need the following imports:

import spray.json.DefaultJsonProtocol._

import spray.httpx.SprayJsonSupport._

DefaultJsonProtocol contains RootJsonFormats for JsObject and JsArray while SprayJsonSupport contains Marshallers for anything that has an implicit RootJsonFormat.

If the value that you are trying to marshal is typed as JsValue (instead of as JsObject or JsArray) than marshalling will fail since JsValue cannot be proven to produce valid Json since a JSON string, boolean, etc. are not valid documents.

In general you don't need to convert to Json yourself, just supply a matching implicit RootJsonFormat and the Marshallers in SprayJsonSupport will do the rest. 

Hope this helps

Age

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[Maatary Okouya]

Many thanks for the detail answer