Mule Dataweave：将单个项放入数组（如果不为null）

我正在从一个API调用接收一个有效负载，我需要将一个值转换成一个包含单个元素的数组

假设以下两个示例是我的有效负载：

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

及

我想这样做：

{
    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?
    ]
}

---

但是编辑总是对我说“这行有多个标记”（LoanOptions:line）

当

语句不完整时
。一方面，缺少
否则运算符。另一方面，
此外，在
名称
字段后面需要逗号

此外，还可以删除方括号：

{
    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 []       
}

when语句不完整。一方面，缺少
否则运算符。另一方面，
此外，在
名称
字段后面需要逗号

此外，还可以删除方括号：

{
    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 []       
}

这可能不是一个优雅的解决方案，但却能为您完成这项工作

%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

 }

如果您不想在输入中不存在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
 }

这可能不是一个优雅的解决方案，但却能为您完成这项工作

%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

 }

如果您不想在输入中不存在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
 }

您需要在when标记中添加条件，也需要添加否则的条件。请看下面的代码片段

%dw 1.0

%输出应用程序/json
{
Name:payload.Name，
贷款：
{
ProductName:payload.loanTerms.term为：字符串，
DisplayName:null，
LoantCommons:payload.loanTerms.term，
费率：有效载荷。贷款利率*100，
金额：payload.loantrems.maxApproved
}当（payload.loainterms！=null）和（payload.loainterms！=[]）以及（payload.loainterms！==“”）时
否则无效

    }

您需要在when标记中添加条件，也需要添加否则的条件。请查看下面的代码片段

%dw 1.0

%输出应用程序/json
{
Name:payload.Name，
贷款：
{
ProductName:payload.loanTerms.term为：字符串，
DisplayName:null，
LoantCommons:payload.loanTerms.term，
费率：有效载荷。贷款利率*100，
金额：payload.loantrems.maxApproved
}当（payload.loainterms！=null）和（payload.loainterms！=[]）以及（payload.loainterms！==“”）时
否则无效

    }

这将把loanOptions设置为单个元素，其中我想要一个数组，如果没有，loanOptions将是[]（空数组）。这将把loanOptions设置为单个元素，其中我想要一个数组，如果没有，loanOptions将是[]（空数组）