Adding custom serializers to jsonFormats in LiftJsonRequestBody

[Vikas Hazrati]

Hi,

I have a piece of code in which looks like this

class UserServlet extends ScalatraServlet with LiftJsonRequestBody {

I expect Json request coming from the client from which the user object is extracted like this

post("/save") {

    logger.info("Entered the UserServlet")

    parsedBody match {

      case JNothing =>

        halt(400, "Invalid Json")

      case json: JObject => {

        val user = json.extract[User]

        UserDAO.save(user)

      }

      case _ =>

        halt(400, "Unknown Json")

    }

  }

The user object is 

case class User(

  @Key("_id") id: ObjectId = new ObjectId,

  firstName: String,

  lastName: String,

...

...

)

I have a problem when i use ObjectId since there is no serializer for that. In other situations I could have added a serializer like this

 implicit val formats = new net.liftweb.json.DefaultFormats {

    override def dateFormatter = new SimpleDateFormat("dd/MM/yyyy")

  } + new EnumerationSerializer(EnumList) + new ObjectIdSerializer

when i do something similar here I get ambiguous references to Formats since jsonFormats is also present in LiftJsonRequestBody. Is there a way to add custom serializers to jsonFormats in LiftJsonRequestBody? Any other way?

Regards | Vikas

blog.knoldus.com

[Ivan Porto Carerro]

You can override the jsonformats. Or use the liftjsonwithoutformats trait. I can't link atm on a phone

[Ivan Porto Carrero]

https://github.com/scalatra/scalatra/blob/develop/lift-json/src/main/scala/org/scalatra/liftjson/LiftJsonRequestBody.scala#L16

[Vikas Hazrati]

Cool thanks, I believe that is a part of 2.1 correct? I would upgrade and try