Scala Play Framework Json Serializer error

Question

Trying to convert class to Json. Here is my class, it includes other two classes:

case class GoodEdit(good: Good, data: List[(String, Option[GoodText])])
case class Good(
  id: Long,
  partnumber: Option[String] = None
)
case class GoodText(
  goodid: Long,
  languageid: Long,
  title: String,
  description: Option[String] = None)

And here are my writers:

object GoodWriters {
  implicit val goodWrites = new Writes[Good] {
    def writes(good: Good) = Json.obj(
      "id" -> good.id,
      "partnumber" -> good.partnumber
    )
  }

  implicit val goodTextWrites = new Writes[GoodText] {
    def writes(goodText: GoodText) = Json.obj(
      "goodid" -> goodText.goodid,
      "languageid" -> goodText.languageid,
      "title" -> goodText.title,
      "description" -> goodText.description
    )
  }

  implicit val GoodEditWrites = new Writes[GoodEdit] {
    def writes(goodEdit: GoodEdit) = Json.obj(
      "good" -> Json.toJson(goodEdit.good),
      "data" -> Json.toJson(
        for ((lang, goodTextOpt) <- goodEdit.data ) yield Json.obj(lang -> goodTextOpt)
      )
    )
  }

Then, in controller I try it to use like this:

  Action {
    import jwriters.GoodWriters._
    GoodEditAggregate.get(id).map{
      a => Ok(Json.toJson(a))
    }.getOrElse(Ok(Json.toJson(Json.obj("status" -> "error","message" -> "Can't find good with this id"))))
  }

And compilator complaining on this part: Ok(Json.toJson(a))

No Json serializer found for type GoodEdit. Try to implement an implicit Writes or Format for this type

Can't understand what is wrong. I've imported writers for objects already

Do you have another Writes implementations imported\defined in the same context? It could be ambiguous implicits — Odomontois
– Odomontois, Commented Oct 24, 2015 at 11:46

Murat Mustafin · Accepted Answer · 2015-10-25 19:58:24Z

0

Try to Import Goodwrites globally

edited Oct 25, 2015 at 19:58

answered Oct 24, 2015 at 13:18

Murat Mustafin

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3 Comments

sergeda Over a year ago

Can you show how correctly write goodEdit.data.toMap? goodwriters object is in another file already.

Murat Mustafin Over a year ago

"data" -> Json.toJson(goodEdit.data.toMap) where you had for expression. Your code have no errors, It runs correctly on my play app 2.4, I think the problem is in imports, try to import GoodWriters globaly

sergeda Over a year ago

Thanks. I've imported GoodWriters globaly and now everything fine. Please make it as answer

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