CODEWITHSUNDEEP
scalaplayframework-2.0
Dark
Dark

Reputation: 803

Json transformers - new field from 2 existing ones

Using the json API, how can I write a transformer for the following:

{
"name":"John Doe",
"number":22
}

to 

{
"name":"John Doe",
"number":22,
"slug":"John-Doe-22"
}

This is doable using string manipulation, but how do I pick the values from the 2 fields and apply that to them?

Upvotes: 2

Views: 797

Answers (1)

Infinity
Infinity

Reputation: 3441

You can do this: 

val json = Json.obj(
   "name" -> JsString("John Doe"),
   "number" -> JsNumber(22)
)

val transformed = 
   json.transform(
      __.json.update(
        (__ \ 'slug).json.put(JsString(
          (json \ "name").as[String].replace(' ', '-') + "-" + (json \ "number").as[Int]
        ))
      )
   ).get

Ok(transformed.toString())
//{"name":"John Doe","number":22,"slug":"John-Doe-22"}

Here is nice post about play json trasformations.

Upvotes: 2

Related Questions