可以使用此等级库：

• • 无论Purchase或cancel是否为数组，此操作都有效**

[
  {
    "operation": "cardinality",
    "spec": {
      "*": "MANY"
    }
  },
  {
    "operation": "shift",
    "spec": {
      "ProductLine": {
        "*": {
          "*": {
            "@1": "[&2].&3",
            "@(3,Purchase[&1])": "[&2].Purchase",
            "@(3,Cancel[&1])": "[&2].Cancel"
          }
        }
      }
    }
  }
]

首先，将数组中的所有值更改为数组，然后可以在ProductLine上循环，并从Purchase和Cancel中获取其他字段。

• • 更新：**以下答案是与Barbaros Özhan合作获得的。特别感谢。

[
  {
    "operation": "cardinality",
    "spec": {
      "*": "MANY"
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "@": "[#2].&2"
        }
      }
    }
  }
]

我们可以在不同的（outer）级别选择Purchase，例如

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "@": "[#2].&2" 
        }
      },
      "Purchase": "[#].&"// at two level less than the inner object
    }
  }
]

站点http://jolt-demo.appspot.com/的*演示

编辑：考虑到属性的数组不确定性，您也可以使用以下规范

[
  { //reform two separate objects
    "operation": "shift",
    "spec": {
      "@": "orj",
      "*": "non_array.&.@0[]"
    }
  },
  { // in order to keep the non-array values as the first component of the newly formed array(s) 
    "operation": "sort"
  },
  {
    "operation": "shift",
    "spec": {
      "*": { //the topmost level 
        "*": { //level for the keys
          "*": "&1[]" //match keys and values to convert non-arrays to arrays
        }
      }
    }
  },
  {// pick the first component for the non-array(s)
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "*": "=firstElement"
      }
    }
  },
  { // apply the original spec after having got individual array values
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "@": "[#2].&2"
        }
      }
    }
  },
  { //get rid of the attributes with null values
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": "=recursivelySquashNulls"
    }
  }
]

或者另一个直接的选择是在应用基数规范之后使用原始规范，例如

[
  {
    "operation": "cardinality",
    "spec": {
      "*": "MANY"
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "@": "[#2].&2"
        }
      }
    }
  }
]