使用 Jolt 将来自 3 个嵌套列表的数据展平为一个列表

Question

实际要求是获取每个 json 对象中的父 ID，如所需输出中所述。输入包含层次结构中的子数组。各自的父 ID 即。如果 id = A_B 那么它的 parent_id 应该是 A。 Jolt 规格尝试过：

[{
        "operation": "shift",
        "spec": {
          "children": {
            "*": {

              "id2": "&",
              "name": "&",
              "path": "&",
              "@": "[&1]",
              "@(2,id)": "[&1].parent_id",
              "children": {
                "*": {
                  "@": "[&1]",
                  "@(3,id2)": "[&1].parent_id2"
                }
              }
            }
          }
        }
      }]

#

输入

#

{
  "categories": [
    {
      "id": "A",
      "name": "firstName",
      "path": "firstPath",
      "children": [
        {
          "id": "A_B",
          "name": "secondName",
          "path": "secondPath",
          "children": [
            {
              "id": "A_B_C",
              "name": "thirdName",
              "path": "thirdPath"
            }
          ]
        }
      ]
    }
  ]
}

#

需要此 OUTPUT

#

[{
  "id": "A",
  "name": "firstName",
  "path": "firstPath",
  "parentId": "0"
},
{
  "id": "A_B",
  "name": "secondName",
  "path": "secondPath",
  "parentId": "A"
},
{
  "id": "A_B_C",
  "name": "thirdName",
  "path": "thirdPath",
  "parentId": "A_B"
}]

Answer 1

规范：运行每个步骤单独查看它在做什么。

[
  {
    // bootstrap the root level to have "parentId": "0"
    "operation": "default",
    "spec": {
      "categories[]": {
        "0": {
          "parentId": "0"
        }
      }
    }
  },
  {
    // Build the "data" object you want, but you have to do it 
    //  maintaining the 3 levels of nested lists as the input
    //  so that the lookups will work.
    "operation": "shift",
    "spec": {
      "categories": {
        "*": {
          "*": "root[&1].data.&",
          "children": {
            "*": {
              "*": "root[&3].firstLevel[&1].data.&",
              "@(2,id)": "root[&3].firstLevel[&1].data.parent_id",
              "children": {
                "*": {
                  "*": "root[&5].firstLevel[&3].secondLevel[&1].data.&",
                  "@(2,id)": "root[&5].firstLevel[&3].secondLevel[&1].data.parent_id"
                }
              }
            }
          }
        }
      }
    }
  },
  {
    // Lastly, accumulate all the finished "data" elements from the 
    //  3 nested arrays  into a single top level array.
    "operation": "shift",
    "spec": {
      "root": {
        "*": {
          "data": "[]",
          "firstLevel": {
            "*": {
              "data": "[]",
              "secondLevel": {
                "*": {
                  "data": "[]"
                }
              }
            }
          }
        }
      }
    }
  }]

使用 Jolt 将来自 3 个嵌套列表的数据展平为一个列表

Flattening data from 3 nested lists, into a single list using Jolt

json

jolt