I am using the json4s library to convert maps in scala to json but keep running into a basic error when operating on Map[Char,Int]:
Here is the code sample that is giving me problems.
import org.json4s.jackson.JsonMethods._
import org.json4s.JsonDSL.WithDouble._
val myMap = Map('a' -> 123)
render(myMap)
error: No implicit view available from (Char, Int) => org.json4s.JsonAST.JValue.
Question: What is the correct way to convert a Map that is made of [Char, Int] to a Json object using Json4s?
The keys of a JSON object are always strings, and furthermore, there is no equivalent of Char
in JSON. See json.org for the specification.
You could convert the keys of your Map[Char, Int]
before rendering:
myMap.map { case(k, v) => (k.toString, v) }
Also you could consider to use
``println(scala.util.parsing.json.JSONObject(m))```
From Scala 2.10
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