Given the following JSON...
{
"values" : [
"one",
"two",
"three"
]
}
... how do I transform it like this in Scala/Play?
{
"values" : [
{ "elem": "one" },
{ "elem": "two" },
{ "elem": "three" }
]
}
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2 Answers
It's easy with Play's JSON Transformers:
val json = Json.parse(
"""{
| "somethingOther": 5,
| "values" : [
| "one",
| "two",
| "three"
| ]
|}
""".stripMargin
)
// transform the array of strings to an array of objects
val valuesTransformer = __.read[JsArray].map {
case JsArray(values) =>
JsArray(values.map { e => Json.obj("elem" -> e) })
}
// update the "values" field in the original json
val jsonTransformer = (__ \ 'values).json.update(valuesTransformer)
// carry out the transformation
val transformedJson = json.transform(jsonTransformer)
Comments
You can use Play's JSON APIs:
import play.api.libs.json._
val json = Json parse """
{
"values" : [
"one",
"two",
"three"
]
}
"""
val newArray = json \ "values" match {
case JsArray(values) => values.map { v => JsObject(Seq("elem" -> v)) }
}
// or Json.stringify if you don't need readability
val str = Json.prettyPrint(JsObject(Seq("values" -> JsArray(newArray))))
Output:
{
"values" : [ {
"elem" : "one"
}, {
"elem" : "two"
}, {
"elem" : "three"
} ]
}
