Dataweave：将单个项目放入数组中，如果不为null

Question

我从API调用接收有效负载，我需要将单个值转换为具有单个元素的数组。

说这两个例子是我的有效载荷：

{
  "name": "Bob",
  "loanTerms": {
    "term": 120,
    "loanRate": 0.0213,
    "maxApproved": 60000
  }
}

和

{
  "name": "Bob",
  "loanTerms": null
}

我想做这样的事情：

{
    Name: payload.name
    LoanOptions: [
        {
            ProductName: payload.loanTerms.term as :string,
            DisplayName: null,
            LoanTermMonth: payload.loanTerms.term,
            Rate: payload.loanTerms.loanRate*100,
            Amount: payload.loanTerms.maxApproved
        } when payload.loanTerms?
    ]
}

但是编辑一直在向我说'＃34;这条线的多个标记＆＃34; （LoanOptions：行）

Answer 1

when 声明不完整。一方面，缺少 otherwise 运算符。另一方面，在 payload.loanTerms? 之后还有其他内容。此外，Name字段后需要逗号。

另外，您可以移除方括号：

{
    Name: payload.name,
    LoanOptions:
        [{
            ProductName: payload.loanTerms.term as :string,
            DisplayName: null,
            LoanTermMonth: payload.loanTerms.term,
            Rate: payload.loanTerms.loanRate*100,
            Amount: payload.loanTerms.maxApproved
        }] when payload.loanTerms != null
        otherwise []       
}

Answer 2

这可能不是一个优雅的解决方案，但可以为您完成工作。

%dw 1.0
%output application/json
---
{
 Name: payload.name,
 (LoanOptions:          
       [{
        ProductName: "abc" as :string,
        DisplayName: null,
        LoanTermMonth: payload.loanTerms.term,
        Rate: payload.loanTerms.loanRate*100,
        Amount: payload.loanTerms.maxApproved

        }]) when payload.loanTerms != null,
 (LoanOptions: null) when payload.loanTerms == null

 }

如果您不希望在输入中没有loanTerms时显示任何内容，则可以删除解决方案中提到的第二个Loanoptions（如下所示）。

%dw 1.0
%output application/json
---
{
 Name: payload.name,
 (LoanOptions:          
   [{
    ProductName: "abc" as :string,
    DisplayName: null,
    LoanTermMonth: payload.loanTerms.term,
    Rate: payload.loanTerms.loanRate*100,
    Amount: payload.loanTerms.maxApproved

    }]) when payload.loanTerms != null
 }

Answer 3

您需要在标记时添加条件以及添加其他条件。看一下下面的代码片段

%dw 1.0

%output application/json

{ Name: payload.name, LoanOptions: { ProductName: payload.loanTerms.term as :string, DisplayName: null, LoanTermMonth: payload.loanTerms.term, Rate: payload.loanTerms.loanRate*100, Amount: payload.loanTerms.maxApproved } when (payload.loanTerms != null) and (payload.loanTerms != []) and (payload.loanTerms != "") otherwise null

    }

}