使用 Jolt 变换从多个 JSON 数组中提取属性

Question

我的 JSON 对象如下所示：

{
  "array1": [
    {
      "key1": "value1", // common key
      "key2": "value2",
      "key3": "value3"
    },
    {
      "key1": "value1", // common key
      "key2": "value2",
      "key3": "value3"
    }
  ],
  "includes": {
    "array2": [
      {
        "key1": "value1", // common key
        "key4": "value4",
        "key5": "value5"
      },
      {
        "key1": "value1",
        "key4": "value4",
        "key5": "value5"
      }
    ]
  }
}

我需要以下格式的输出 -

[ 
  {
    "key1": "value1",
    "key2": "value2",
    "key3": "value3",
    "key4": "value4", // this comes from joining with array 2 based on key1
    "key5": "value5"  // this comes from joining with array 2 based on key1
  }, 
  {
    "key1": "value1",
    "key2": "value2",
    "key3": "value3",
    "key4": "value4", // this comes from joining with array 2 based on key1
    "key5": "value5"  // this comes from joining with array 2 based on key1
  }
]

我只有从 array1 获取字段的解决方案，但不确定如何根据公共键与 array2 连接，获取所需字段并以所需方式表示它们。

当前转换：

[
  {
    "operation": "shift",
    "spec": {
      "data": {
        "*": {
          "key1": "[&1].key1",
          "key2": "[&1].key2",
          "key3": "[&1].key3"
        }
      }
    }
  }
]

当前不需要的输出：

[ 
  {
    "key1" : "value1",
    "key2" : "value2",
    "key3" : "value3"
  }, 
  {
    "key1" : "value1",
    "key2" : "value2",
    "key3" : "value3"
  } 
]

如有任何帮助，我们将不胜感激。谢谢！

Answer 1

首先，为了获得“不需要的输出”，需要将"data"替换为"*"当前转换规范内的通配符，无需重复每个属性键名称和值分支，仅使用此规范即可

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "*": "[&1].&"
        }
      }
    }
  }
]

如果你再嵌套一层

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "*": {
            "*": "[&1].&"
          }
        }
      }
    }
  }
]

那么，你会得到

[ 
  {
    "key1" : "value1",
    "key4" : "value4",
    "key5" : "value5"
  }, 
  {
    "key1" : "value1",
    "key4" : "value4",
    "key5" : "value5"
  } 
]

我们可以在不同级别的对象上使用"*"和"@"通配符来组合这些对象结果，但在这种情况下，键名 "key1" 的值当然会重复。我们可以通过添加 cardinality transformation 来摆脱重复，并得到您想要的结果，例如

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "*": {
            "*": "[&1].&"
          },
          "@": "[&1]"
        }
      }
    }
  },
  {
    "operation": "cardinality",
    "spec": {
      "*": {
        "*": "ONE"
      }
    }
  }
]

站点 http://jolt-demo.appspot.com/ 上的演示是：

使用 Jolt 变换从多个 JSON 数组中提取属性

Extract properties from multiple JSON arrays using Jolt transformation

transform

jolt