java - 使用 JOLT 解析器无法获得预期的输出

Question

我有以下input：

[
  {
    "ownerId": "XTV7I728",
    "vehicleId": "999",
    "engines": [
      {
        "engineId": "1",
        "engineName": "Standard Engine",
        "engineHp": 300
      },
      {
        "engineId": "2",
        "engineName": "Custom Engine",
        "engineHp": 450
      }
    ]
  }
]

我需要如下expected输出：

    [{
      "ownerId": "XTV7I728",
      "vehicleId": "999",
      "engines":{
      "engineId": "1",
      "engineName": "Standard Engine",
      "engineHp": 300
}
    },
    {
      "ownerId": "XTV7I728",
      "vehicleId": "999",
"engines":{
      "engineId": "2",
      "engineName": "Custom Engine",
      "engineHp": 450
    }
}] 

我在下面尝试过，spec但它抛出了一个错误：

[{
  "ownerId": "ownerId",
  "*": {
    "vehicleId": "vehicleId",
    "engineId": "engineId",
    "engineHp": "engineHp"
  }
}]

Error：

Error running the Transform.

JOLT Chainr 'operation' must implement Transform or ContextualTransform at index:0.  

请让我知道我哪里出错了。

标签： javajolt

Answer 1

您必须指定操作（如果使用链规范），然后指定执行spec对象树的实际“行走”的部分。这应该有效：

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "engines": {
          "*": {
            "@(2,ownerId)": "[#2].ownerId",
            "@(2,vehicleId)": "[#2].vehicleId",
            "*": "[#2].&"
          }
        }
      }
    }
  }
]