Dataweave in Mule - Change value Array of Objects - mule

Question

I get a payload as input in the message transform component. It is an Array with Objcts:
[
{
"enterprise": "Samsung",
"description": "This is the Samsung enterprise",
},
{
"enterprise": "Apple",
"description": "This is the Apple enterprise ",
}
]
I have a variable that replaces the description and the output that I want is:
[
{
"enterprise": "Samsung",
"description": "This is the var value",
},
{
"enterprise": "Apple",
"description": "This is the var value",
}
]
I tried to use:
%dw 2.0
output application/java
---
payload map ((item, index) -> {
description: vars.descriptionValue
})
But it returns:
[
{
"description": "This is the var value",
},
{
"description": "This is the var value",
}
]
Is possible to replace only the description value keeping the rest of the fields? Avoiding adding the other fields in the mapping.

Answer 1

There are many ways to do this.
One way to do it is to first remove the original description field and then add the new one
%dw 2.0
output application/java
---
payload map ((item, index) ->
item - "description" ++ {description: vars.descriptionValue}
)
Otherwise you can use mapObject to iterate over the key-value pairs of each object and with pattern matching add a case for when the key is description.
I prefer this second way of doing it when I want to do many replacements.
%dw 2.0
output application/java
fun process(obj: Object) = obj mapObject ((value, key) -> {
(key): key match {
case "description" -> vars.descriptionValue
else -> value
}
})
---
payload map ((item, index) ->
process(item)
)