颠簸映射字段存在到布尔字段

如何解决颠簸映射字段存在到布尔字段

我需要一个颠簸的规范，将输入中“种类”字段的存在映射到输出中的布尔字段

输入：

{
  "payload": {
    "device_id": "99cbf1618f87","kind": "event"
   }
}

期望的输出：

{
   "device_id": "99cbf1618f87","has_kind": true
}

---

输入：

{
  "payload": {
    "device_id": "99cbf1618f87"
   }
}

期望的输出：

{
   "device_id": "99cbf1618f87","has_kind": false
}

解决方法

使用默认操作，以引入不存在的kind字段。然后移动值。

[
  {
    "operation": "default","spec": {
      "payload": {
        /* 
         * introduce the kind node,where kind does not exists
         * Use the value that will not come as a part of the kind
         * kind node in original json. In this spec,"notexists"
         * is used
         */
        "kind": "notexists"
      }
    }
  },{
    "operation": "shift","spec": {
      "payload": {
        "device_id": "device_id","kind": {
          /*
           * If kind has the value notexists then set the has_kind
           * to false,else set the has_kind to true
           */
          "notexists": {
            "#false": "has_kind"
          },"*": {
            "#true": "has_kind"
          }
        }
      }
    }
  }
]