PlayFramework:如何转换JSON数组的每个元素 [英] PlayFramework: how to transform each element of a JSON array

问题描述

给出以下JSON ...

Given the following JSON...

{
  "values" : [
     "one",
     "two",
     "three"
  ]
}

...如何在Scala/Play中将其转换为这样?

... how do I transform it like this in Scala/Play?

{
  "values" : [
     { "elem": "one" },
     { "elem": "two" },
     { "elem": "three" }
  ]
}

推荐答案

您可以使用Play的JSON API:

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))))

输出:

{
  "values" : [ {
    "elem" : "one"
  }, {
    "elem" : "two"
  }, {
    "elem" : "three"
  } ]
}

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