否则数据编织映射

Question

`输入：-

{"id":
{
 "items" : [
{
"merchant_ref": "icici",
"transaction_tag": "sdfhisdb",
"transaction_type": "balance_inquiry",
"method": "valuelink",
"order_number": "123",
"amount": "1000",
"currency_code": "CAD",
"token": {
  "token_type": "",
  "token_data": {
    "type": "",
    "value": "",
    "cardholder_name": "",
    "exp_date": ""
  }
},
{
"merchant_ref": "icici",
"transaction_tag": "sdfhisdb",
"transaction_type": "balance_inquiry",
"method": "valuelink",
"order_number": "123",
"amount": "2000",
"currency_code": "",
"token": {
  "token_type": "",
  "token_data": {
    "type": "",
    "value": "",
    "cardholder_name": "",
    "exp_date": ""
  }
},  
{
"merchant_ref": "icici",
"transaction_tag": "sdfhisdb",
"transaction_type": "authorize",
"method": "token",
"order_number": "123",
"amount": "3000",
"currency_code": "",
"token": {
  "token_type": "",
  "token_data": {
    "type": "",
    "value": "",
    "cardholder_name": "",
    "exp_date": ""
  }
}

] } }`

输出：- 没有任何 Null B，因为我需要在这个没有 Null B 的输出的基础上做另一个映射

<A>
  <B>
    <merchant_ref>icici</merchant_ref>
    <transaction_tag>sdfhisdb</transaction_tag>
    <transaction_type>balance_inquiry</transaction_type>
    <method>valuelink</method>
    <order_number>123</order_number>
    <amount>1000</amount>
    <currency_code>CAD</currency_code>
    <token>
      <token_type></token_type>
      <token_data>
        <type></type>
        <value></value>
        <cardholder_name></cardholder_name>
        <exp_date></exp_date>
      </token_data>
    </token>
  </B>
  <B>
    <merchant_ref>icici</merchant_ref>
    <transaction_tag>sdfhisdb</transaction_tag>
    <transaction_type>balance_inquiry</transaction_type>
    <method>valuelink</method>
    <order_number>123</order_number>
    <amount>2000</amount>
    <currency_code></currency_code>
    <token>
      <token_type></token_type>
      <token_data>
        <type></type>
        <value></value>
        <cardholder_name></cardholder_name>
        <exp_date></exp_date>
      </token_data>
    </token>
  </B>
</A>

尝试使用下面的数据编织检查 xml 的内容，但得到的输出为空 B，如请建议如何避免这种情况。因为我需要为每个元素做另一个从 xml 到 xml 的点对点映射，但是映射正在创建一个额外的映射，其中 B 也为 null。

请建议如何避免这种情况

%dw 1.0
%output application/xml
---

A: payload.id.*items mapObject
{
 
       B:$  when $.method=="valuelink"      
      
      otherwise {
       
      }
     }

Answer 1

下面应该可以。请注意，B:$ 由 () 封装，这意味着仅当 'when' 条件为真时，才将此属性包含在输出中。

%dw 1.0
%output application/xml
---
{
    A: payload.A.*B mapObject {
        (B:$) when $.method == 'valuelink'
    }
}

否则数据编织映射

dataweave mapping when otherwise

xml

mule

anypoint-studio

dataweave