在dataweave中保留数据库输出排序

Question

我有一个要求，要求 dataweave 输出按特定顺序排列。

这是我必须处理的数据库输出

[
  {
    "order": "Order 2",
    "inv": 6150579.00000,
    "dio": 31,
    "week": "2020-06-01T00:00:00"
  },
  {
    "order": "Order 2",
    "inv": 6318049.21000,
    "dio": 33,
    "week": "2020-06-08T00:00:00"
  },
  {
    "order": "Order 1",
    "inv": 6306077.76000,
    "dio": 45,
    "week": "2020-06-01T00:00:00"
  },
  {
    "order": "Order 1",
    "inv": 6047050.75000,
    "dio": 43,
    "week": "2020-06-08T00:00:00"
  },
]

在数据库查询中，我写了条件，以便根据特定的顺序条件对其进行排序。在这种情况下，例如订单“12345 - 订单 1”必须首先出现在输出中。

但是当我使用 groupBy 条件转换 dataweave 中的输出时，排序顺序已更改

payload map {

       "order" : $.order,
       "inv" : $.inv,
       "dio" : $.dio,
       "week" : $.week
} groupBy $.order

输出：

{
  "Order 1": [
    {
      "order": "Order 1",
      "inv": 6306077.76000,
      "dio": 45,
      "week": "2020-06-01T00:00:00"
    },
    {
      "order": "Order 1",
      "inv": 6047050.75000,
      "dio": 43,
      "week": "2020-06-08T00:00:00"
    }
  ],
  "Order 2": [
    {
      "order": "Order 2",
      "inv": 6150579.00000,
      "dio": 31,
      "week": "2020-06-01T00:00:00"
    },
    {
      "order": "Order 2",
      "inv": 6318049.21000,
      "dio": 33,
      "week": "2020-06-08T00:00:00"
    }
  ]
}

您看到订单 1 值排在第一位。

这是我编造的例子。实际上我有数百个数据。在这种情况下，按 $$ 排序也是错误的。

Answer 1

groupBy() 不保证任何顺序。如果没有明确提及，您不应该假设任何操作都会保留顺序。您必须明确订购输出：

%dw 2.0
output application/json
---
payload map {

       "order" : $.order,
       "inv" : $.inv,
       "dio" : $.dio,
       "week" : $.week
} groupBy $.order 
mapObject (($$): $ orderBy -$.inv ) // order inside each group by inv descending order
orderBy $$ // order the groups by key

更新：根据评论，我更改了脚本以按相反顺序按 inv 属性对每个组进行排序。

更新 2：我还按键排序了每个组，所以 'Order 1' 在 'Order 2' 之上。

输出：

{
  "Order 1": [
    {
      "order": "Order 1",
      "inv": 6306077.76000,
      "dio": 45,
      "week": "2020-06-01T00:00:00"
    },
    {
      "order": "Order 1",
      "inv": 6047050.75000,
      "dio": 43,
      "week": "2020-06-08T00:00:00"
    }
  ],
  "Order 2": [
    {
      "order": "Order 2",
      "inv": 6318049.21000,
      "dio": 33,
      "week": "2020-06-08T00:00:00"
    },
    {
      "order": "Order 2",
      "inv": 6150579.00000,
      "dio": 31,
      "week": "2020-06-01T00:00:00"
    }
  ]
}

在dataweave中保留数据库输出排序

Preserve the database output sort in dataweave

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