Problem parsing null values in json

[Thomas Fisher]

Hi everyone. Having a problem with play.api.data.FormUtils. It seems to filter out nulls when turning JsValues into a map. For example:

scala> myJson

res30: play.api.libs.json.JsObject = {"tommy":"test","null":null}

scala> fromJson("", myJson)

res32: Map[String,String] = Map(tommy -> test)

seems like the offending line is in https://github.com/playframework/playframework/blob/master/framework/src/play/src/main/scala/play/api/data/Form.scala#L384

    case JsNull => Map.empty

Does anyone have any recommendations?

[James RopR]

Personally, I like to know when I get a value out of a map, that it's not going to be null, this is one thing that makes Scala maps so much better than Java maps.  Putting nulls into maps undermines this.

The json support in Play's form API is just a convenience so that you can share data types for forms and maps.  There's no such thing as a null in a form, so it gets ignored.  If you want to handle proper json data types, use Play's json Reads/Writes APIs.

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James RopR
Software Engineer

Typesafe – Build reactive apps!
Twitter: @jroper