CODEWITHSUNDEEP
scalaplayframework-2.0
Alan Jurgensen
Alan Jurgensen

Reputation: 853

play 2 json suppress empty elements

I'm using Play 2 case class inception to translate to/from POSO (plain old scala object) and json strings.

on the toJson write transform, I want the empty POSO vals (Strings and Lists) to not even show up in the json string... howto do that?

Upvotes: 2

Views: 1413

Answers (1)

Ryan
Ryan

Reputation: 7247

You can add an implicit function omitEmpty quite easily.

implicit class RichJsObject(original: JsObject) {
  def omitEmpty: JsObject = original.value.foldLeft(original) { 
    case (obj, (key, JsString(st))) if st.isEmpty => obj - key
    case (obj, (key, JsArray(arr))) if arr.isEmpty => obj - key
    case (obj, (_, _)) => obj
  }
}

Then you can call omitEmpty on a JsObject.

scala> Json.obj("x" -> "", "y" -> JsArray()).omitEmpty
res5: play.api.libs.json.JsObject = {}

Upvotes: 2

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