如何使用嵌套 "map"

Question

我想根据一些嵌套属性映射一个 json，但我似乎犯了一个愚蠢的错误。

我的输入：

[
  {
    "productNo": "00011111",
    "items": [
      {
        "color": "000000000006000060",
      },
      {
        "color": "000000000006000061",
      }
    ]
  },      
  {
    "productNo": "00022222",
    "items": [
      {
        "color": "000000000006000060"
      },
      {
        "color": "000000000006000061"
      }
    ]
  }
]

我的改造：

%dw 2.2
output application/json

---
payload map ( prod , indexOfProd ) -> { 
        (prod.items map (prodItem, indexOfProdItem) -> {
            PNR: prod.productNo,
            Color: color.quantity       
        })
            
}

我的结果：

[
  {
    "PNR": 00011111,
    "Color": "000000000006000060",
    "PNR": 00011111,
    "Color": "000000000006000061"
  },
  {
    "PNR": 00022222,
    "Color": "000000000006000060",
    "PNR": 00022222,
    "Color": "000000000006000061"
  }
]

我的预期结果/我想要得到的：

[
  {
    "PNR": 00011111,
    "Color": "000000000006000060"
  },
  {
    "PNR": 00011111,
    "Color": "000000000006000061"
  },
  {
    "PNR": 00022222,
    "Color": "000000000006000060"
  },
  {
    "PNR": 00022222,
    "Color": "000000000006000061"
  }
]

任何提示为什么它不根据颜色变化分离结果？

Answer 1

您可以使用以下数据编织表达式：

%dw 2.0
output application/json
---
flatten(payload map (item, index) -> item.items map (subItem, subIndex) -> {
    "PNR": item.productNo,
    "Color": subItem.color
})

Answer 2

使用您现有解决方案 Martin 的另一种变体。

%dw 2.0
output application/json

---
flatten (payload map ( prod , indexOfProd ) -> { 
        temp: (prod.items map (prodItem, indexOfProdItem) -> {
            PNR: prod.productNo,
            Color: prodItem.color     
        })
            
}.temp)

如何使用嵌套 "map"

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dataweave

mulesoft