Dataweave XML to JSON根據xml中的屬性創建密鑰對值

Question

我正在嘗試使用dataweave以特定格式創建json。

xml在某些元素中有屬性，我需要用它來在json文件中創建一個未定義的鍵。

XML

<Ingredients> 
<Ingredient>225g/8oz unsalted butter, softened, plus extra for greasing</Ingredient> 
<Ingredient>175g/6oz dried cranberries</Ingredient> 
</Ingredients> 
<Ingredients Section="FOR THE FRUIT"> 
<Ingredient>150ml/¼pt cloudy apple juice</Ingredient> 
<Ingredient>50g/2oz unsalted butter</Ingredient> 
</Ingredients> 
<Ingredients Section="TO FEED THE CAKE (each time)"> 
<Ingredient>2 tbsp dark rum</Ingredient> 
<Ingredient>1 tbsp maple syrup</Ingredient> 
</Ingredients> 

JSON的輸出應該是這樣的。訣竅是當Section = null時，應該使用Ungrouped，否則使用Section的值。

JSON

{ 
    "ingredients": { 
     "Ungrouped": { 
      "position": 0, 
      "list": [{ 
       "position": 1, 
       "description": "225g/8oz unsalted butter, softened, plus extra for greasing" 
      }, { 
       "position": 2, 
       "description": "225g/8oz light muscovado sugar" 
      }] 
     }, 
     "FOR THE FRUIT": { 
      "position": 1, 
      "list": [{ 
       "position": 1, 
       "description": "150ml/¼pt cloudy apple juice" 
      }, { 
       "position": 2, 
       "description": "50g/2oz unsalted butter" 
      }] 
     }, 
     "TO FEED THE CAKE (each time)":{ 
      "position":2, 
      "list": [{ 
       "position": 1, 
       "description": "2 tbsp dark rum" 
      }, 
      { 
       "position": 2, 
       "description": "1 tbsp maple syrup" 
      }] 
     } 
    } 
} 

這裏是我的數據編織的開始。我還沒有取得進一步的進展，因爲我能夠設置未分組部分至關重要。

Dataweave

%dw 1.0 
%input payload application/xml 
%output application/json 
--- 
{ 
recipe: { 
"ingredients": { (payload.Recipe.*Ingredients.@Section map 
'Ungrouped':{ 
    position : $$+0 
    } when $ == null otherwise 

'$':{ 
    position : $$+0 
    } 
)} 
} 
} 

我希望我已經涵蓋了一切。請讓我知道，如果我沒有，因爲這是我在stackoverflow上的第一篇文章。

Answer 1

如果沒有其他Ingredients沒有Section，那麼你可以做：

%dw 1.0 
%output application/json 
%var addPosition = (list) -> list map { 
    "position": $$+1, 
    "description" : $ 
} 
--- 
recipe: ingredients: {(
    ("Ungrouped" + payload.Recipe.*Ingredients.@Section) map { 
    "$" : { 
     "position": $$, 
     "list": addPosition(payload.Recipe.*Ingredients[$$].*Ingredient) 
    } 
    } 
)}