如何按 object 中的字段分組以創建對象數組？

Question

我有一個包含對象數組的輸入有效負載，我需要在其中按id-key進行group-by id-key 形成 2 arrays 對象。 請參閱下面的詳細信息。

輸入有效載荷：

{
  "id": {
    "header_id": "460",
    "id-branch": {
      "branch-name": "genaral motors",
      "req-name": "genaral motors",
      "id-key": "0791",
      "id-lines": {
        "id-key": "0791",
        "productId": "463"
      }
    },
    "id-branch": {
      "branch-name": "genaral motors",
      "req-name": "genaral motors",
      "id-key": "9692",
      "id-lines": {
        "id-key": "9692",
        "productId": "464"
      },
      "id-lines": {
        "id-key": "9692",
        "productId": "465"
      }
    }
  }
}

所需的輸出：

[                      
 {
  "branch-name": "genaral motors",
  "req-name": "genaral motors",
  "type": "dhl",
  "lines-ids": "swr",
  "lines": [
    {
      "productId": "463"
    }
  ]
 },
 {
  "branch-name": "genaral motors",
  "req-name": "genaral motors",
  "type": "dhl",
  "lines-ids": "swr",
  "lines": [
    {
      "productId": "464"
    },
    {
      "productId": "465"
    }
  ]
 }
]

output 必須生成為 object 的數組，該數組將productId分組在相同的 id-key 下。

Answer 1

假設鍵已經按產品 ID 分組，我使用 filterObject() 刪除不需要的鍵，然后使用 pluck() 將值選取到數組中。 之后，我從每個元素中刪除了 output 中未使用的鍵。添加的鍵我假設是文字，因為沒有給出任何指示。 為了清楚起見，我實現了一個 function 來封裝線路的映射。

%dw 2.0
output application/json
fun updateLines(x)=
    x - "id-lines" ++ {lines: x.*"id-lines" map {productId: $.productId}}
---
payload.id
    filterObject ((value, key, index) -> key as String == "id-branch")
    pluck ($) 
    map (updateLines($) - "id-key" ++ { "type": "dhl", "lines-ids": "swr"})

Output：

[
  {
    "branch-name": "genaral motors",
    "req-name": "genaral motors",
    "lines": [
      {
        "productId": "463"
      }
    ],
    "type": "dhl",
    "lines-ids": "swr"
  },
  {
    "branch-name": "genaral motors",
    "req-name": "genaral motors",
    "lines": [
      {
        "productId": "464"
      },
      {
        "productId": "465"
      }
    ],
    "type": "dhl",
    "lines-ids": "swr"
  }
]