在 Play Scala 中更新嵌套的 JsObject

Question

我的输入 json 看起来像这样：

{
    "dashboard": {
            "id": 0,
            "originalTitle": "Test dashboard",
            "rows": [
                    {
                            "collapse": false,
                            "editable": true,
                            "height": "250px",
                            "panels": [],
                            "title": "Row"
                    }
            ],
            "schemaVersion": 0,
            "tags": [
                    "T35T-DA5H-80ARD"
            ],
            "timezone": "browser",
            "title": "Test dashboard",
            "version": 0
    },
    "overwrite": true
}

我想通过向列表中添加一个元素来更新 "panels" 字段。我现在能做的是选择 "panels":

的值

val json = Json.parse(dashboardJson).validate[JsObject].get
json.transform(
  (__ \ 'dashboard).json.pickBranch
  (
    (__ \ 'rows).json.pickBranch
    (
      (__ \ 'panels).json.pick
    )
  )
)

这导致：

JsSuccess({"dashboard":{"rows":[]}},/dashboard/rows//panels)

但是当我尝试这样更新它时，它不起作用:

json.transform(
  (__ \ 'dashboard).json.pickBranch
  (
    (__ \ 'rows).json.pickBranch
    (
      (__ \ 'panels).json.update
      (
        __.read[JsObject].map { o => o ++ Json.obj( "bla" -> "blabla" ) }
      )
    )
  )
)

这导致：

JsError(List((/dashboard/rows,List(ValidationError(List(error.expected.jsobject),WrappedArray())))))

知道我做错了什么吗？

Answer 1

您必须遍历每个 JsArray（行和面板）：

import play.api.libs.functional.syntax._
import play.api.libs.json.Json._
import play.api.libs.json.Reads._
import play.api.libs.json._

val t = (
  (__ \ "dashboard" \ "rows").json.update(
    of[JsArray](
      list(
        (__ \ "panels").json.update(
          of[JsArray].map{ case JsArray(arr) => JsArray(arr :+ JsString("sss"))}
        )
      ).map(JsArray)
    )
  )
)

json.transform(t)

scala> JsSuccess({
  "dashboard": {
    "id": 0,
    "originalTitle": "Test dashboard",
    "rows": [
      {
        "collapse": false,
        "editable": true,
        "height": "250px",
        "panels": [
          "sss"
        ],
        "title": "Row"
      }
    ],
    "schemaVersion": 0,
    "tags": [
      "T35T-DA5H-80ARD"
    ],
    "timezone": "browser",
    "title": "Test dashboard",
    "version": 0
  },
  "overwrite": true
},/dashboard/rows)

在 Play Scala 中更新嵌套的 JsObject

Updating a nested JsObject in Play Scala

json

scala

playframework-2.0