Playframework，将地图转换为json

Question

I have a map (this is in a scala template file)

<Integer, Map<Integer, Double>>

How do i convert this to a json string?

I've tried

@Json.stringify(Json.toJson(moduleId2DecileMap))

This does not work, it complains that it doesn't know what to do with a Map (sigh).

GSON isn't available, as whenever I import GSON playframework bursts, so I need a solution using the in-built play json thing or some other json framework.

OH i was using the wrong import- i had

@import play.api.libs.json._

YOU NEED

@import play.libs.Json

Answer 1

OH i was using the wrong import- i had

@import play.api.libs.json._

YOU NEED

@import play.libs.Json