使用 dwl 2.0 展平具有可变深度的嵌套数组

Question

我有以下数据：

{
  "currencyCode": "GBP",
  "type": "New",
  "orderLines": [
    {
      "currencyCode": "EUR",
      "id": "8023O000000Cc8pQAC",
      "orderLines": [
        {
          "currencyCode": "EUR",
          "id": "8023O000000Cc8qQAC",
          "parentId": "8023O000000Cc8pQAC",
          "orderLines": []
        },
        {
          "currencyCode": "EUR",
          "id": "8023O000000Cc8rQAC",
          "parentId": "8023O000000Cc8pQAC",
          "orderLines": []
        }
      ]
    },
    {
      "currencyCode": "EUR",
      "id": "8023O000000Cc8vQAC",
      "orderLines": [
        {
          "currencyCode": "EUR",
          "id": "8023O000000Cc8wQAC",
          "parentId": "8023O000000Cc8vQAC",
          "orderLines": []
        }
      ]
    }
  ]
}

注意：orderLines 数组可以是任意深度

我想要这样的输出：

{
  "currencyCode": "GBP",
  "type": "New",
  "orderLines": [
    {
      "currencyCode": "EUR",
      "id": "8023O000000Cc8pQAC",
      "orderLines": []
    },
    {
        "currencyCode": "EUR",
        "id": "8023O000000Cc8qQAC",
        "parentId": "8023O000000Cc8pQAC",
        "orderLines": []
    },
    {
        "currencyCode": "EUR",
        "id": "8023O000000Cc8rQAC",
        "parentId": "8023O000000Cc8pQAC",
        "orderLines": []
    },
    {
      "currencyCode": "EUR",
      "id": "8023O000000Cc8vQAC",
      "orderLines": []
    },  
    {
      "currencyCode": "EUR",
      "id": "8023O000000Cc8wQAC",
      "parentId": "8023O000000Cc8vQAC",
      "orderLines": []
    }
  ]
}

Answer 1

您可以使用执行以下操作的递归函数来完成此操作：

如果关卡中没有元素returns []
递归地获取每个级别的orderLines（没有子字段）
追加下一级的orderLines

像这样：

%dw 2.0
output application/json

fun getNextLevel(orders: Array) = flatten(orders.orderLines)

fun removeChildren(orders: Array) = 
    orders map ((value) -> 
        value - "orderLines"
    )

fun getOrders(orders: Array) = do {
    orders match {
        case [] -> []
        else -> removeChildren(orders) ++ getOrders(getNextLevel(orders))
    }

}
---
{
  "currencyCode": payload.currencyCode,
  "type": payload."type",
  "orderLines": getOrders(payload.orderLines)
}

使用 dwl 2.0 展平具有可变深度的嵌套数组

flattening of nested arrays with variable depth with dwl 2.0

dataweave

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