Dataweave Error for Null nodes

Question

I have done coding in dataweava as

%dw 1.0
%input payload application/xml
%output application/xml skipNullOn="everywhere"
---
{((payload.*Order default []) map {
Order:{
    Channel:$.@EnterpriseCode,
    Code:$.@OrderNo,
    Status:$.@Status,
    OrderLines: {
    (($.OrderLines.*OrderLine default []) map {
    OrderLine:{
        EntryNumber:"abc",
        Status:$.@Status,

        (($.OrderStatuses.*OrderStatus default []) map {

        ShipDate:$.@StatusDate

        }) 
    }})}
}

}
)
}

But its giving error when assigning input as

<?xml version="1.0" encoding="UTF-8"?>
<Order EnterpriseCode="111" OrderNo="222" Status="Scheduled">
    <OrderLines>
        <OrderLine PrimeLineNo="2" Status="Shipped" OrderedQty="1000">

        </OrderLine>
    </OrderLines>
</Order>

Any suggestions here? I have tried default [] but its not working. When assigning null node its giving error. I have tried filter as filter ($ != '')

Answer 1

XML input example:

<?xml version="1.0" encoding="UTF-8"?>
<Order EnterpriseCode="111" OrderNo="222" Status="Scheduled">
  <OrderLines>
    <OrderLine PrimeLineNo="2" Status="Shipped" OrderedQty="1000">
       <OrderStatuses>
          <OrderStatus StatusDate="statusDate"></OrderStatus>
          <OrderStatus StatusDate="statusDate"></OrderStatus>
      </OrderStatuses>
    </OrderLine>
    <OrderLine PrimeLineNo="3" Status="Shipped3" OrderedQty="10003" ></OrderLine>
  </OrderLines>
</Order>

Note: In your example there are spaces between OrderLine open tag and close tag, you have to fix it:

<OrderLine PrimeLineNo="3" Status="Shipped3" OrderedQty="10003" ></OrderLine>

Dataweave script:

%input payload application/xml
%output application/xml skipNullOn="everywhere"
---
{
  ((payload.*Order default []) map {
    Order:{
      Channel:$.@EnterpriseCode,
      Code:$.@OrderNo,
      Status:$.@Status,

      OrderLines: {
        (($.OrderLines.*OrderLine default []) map {

          OrderLine:{
            EntryNumber:"abc",
            Status:$.@Status, 

            (($.OrderStatuses.*OrderStatus default []) map ((key,pos) -> {
                ShipDate:key.@StatusDate
            }) when $!='' otherwise {})

          }

        })
      }


    }
  })
}

You can't map a value if it doesn't exist, so you have to use "when/otherwise" to verify the existence of the elements.