%dw 2.0
output application/json
fun reduceMapFor(data) = data reduce (($$ splitBy ":")[0] ++ "," ++ ($ splitBy ":")[0])
---
payload.results map() ->
{
email: $.profile.email,
name: $.profile.firstName,
tags: reduceMapFor($.data.interests.tags[0]),
(contenttypes: reduceMapFor($.data.interests.contenttypes[0])) if(sizeOf($.data.interests.contenttypes[0]) > 0)
}
Define a Function that Flattens Data in a List
DataWeave 2.1 is compatible with Mule 4.1. Standard Support for Mule 4.1 ended on November 2, 2020, and this version of Mule will reach its End of Life on November 2, 2022, when Extended Support ends. Deployments of new applications to CloudHub that use this version of Mule are no longer allowed. Only in-place updates to applications are permitted. MuleSoft recommends that you upgrade to the latest version of Mule 4 that is in Standard Support so that your applications run with the latest fixes and security enhancements. |
When presented with nested structures of data, you might need to reduce (or "flatten") the data in them to produce a simpler output. This DataWeave example flattens the data in the interests
and contenttypes
arrays with the function that is defined in the header, and it only outputs contenttypes
when it is not empty.
The example uses these functions:
-
map
to go through a set elements in the input. -
reduce
to flatten the arrays. -
if
to conditionally display a field. -
splitBy
to parse the input.
{
"results": [
{
"profile": {
"firstName": "john",
"lastName": "doe",
"email": "johndoe@demo.com"
},
"data": {
"interests": [
{
"language": "English",
"tags": [
"digital-strategy:Digital Strategy",
"innovation:Innovation"
],
"contenttypes": []
}
]
}
},
{
"profile": {
"firstName": "jane",
"lastName": "doe",
"email": "janedoe@demo.com"
},
"data": {
"interests": [
{
"language": "English",
"tags": [
"tax-reform:Tax Reform",
"retail-health:Retail Health"
],
"contenttypes": [
"News",
"Analysis",
"Case studies",
"Press releases"
]
}
]
}
}
],
"objectsCount": 2,
"totalCount": 2,
"statusCode": 200,
"errorCode": 0,
"statusReason": "OK"
}
[
{
"email": "johndoe@demo.com",
"name": "john",
"tags": "digital-strategy,innovation"
},
{
"email": "janedoe@demo.com",
"name": "jane",
"tags": "tax-reform,retail-health",
"contenttypes": "News,Analysis,Case studies,Press releases"
}
]