DataWeave 2.0 If else 条件

Question

我是 Dataweave 的新手，试图根据以下实现简单的 if else 条件

if (vars.country == "USA")
  { currency: "USD" }
else { currency: "EUR" }

这很好用。但是，当我尝试使用如下所示的其他 json 变量时，它失败了

%dw 2.0
output application/json encoding="UTF-8"
---
Name: "ABC",
if (vars.country == "USA")
  { currency: "USD" }
else { currency: "EUR" }

Answer 1

完成它的几种方法:

使用与您所拥有的类似的表达式，当对象中有多个字段时，您必须将对象括在 {} 中

%dw 2.0
output application/json encoding="UTF-8"
---
{
  Name: "ABC",
  (if (vars.country == "USA")
     currency: "USD" 
   else  
     currency: "EUR")
}

使用++ 函数连接对象，heres the documentation

%dw 2.0
output application/json encoding="UTF-8"
---
{Name: "ABC"} ++ (
    if (vars.country == "USA")
        {currency: "USD"}
    else
        {currency: "EUR"}
)

最后，使用 conditional elements特征

%dw 2.0
output application/json encoding="UTF-8"
---
{
    Name: "ABC",
    (currency: "USD") if (vars.country == "USA"),
    (currency: "EUR") if not (vars.country == "USA")
}

选择你喜欢的。