%dw 2.0
output application/json
var applyMapping = (input, mappingsDef) -> (
mappingsDef map (def) -> {
(def.target) : input[def.source] default def."default"
}
)
---
payload.sfdc_users.*sfdc_user map (user) -> (
applyMapping(user, vars.mappings)
)
Dynamically Map Based on a Definition
DataWeave 2.2 is compatible and bundled with Mule 4.2. This version of Mule reached its End of Life on May 2, 2023, when Extended Support ended. 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. |
You can create a transformation that can dynamically change what it does depending on a definition input. This DataWeave example receives both a payload input, and a variable named mapping
that specifies how to rename each field and what default value to use in each.
Before you begin, note that DataWeave version 2 (%dw 2.0
) is for Mule 4 apps. For a
Mule 3 app, refer to DataWeave 1.0
(%dw 1.0
) examples,
within the Mule 3.9 documentation set. For other Mule versions, you can use
the Mule Runtime version selector in the table of contents.
The example uses the following:
-
A
map
function to go through all of the elements in the input array. Also a secondmap
function to go through each field in each element. -
A custom function that applies the changes specified in the
mapping
variable. -
default
to set a default value, that comes from themapping
variable.
<sfdc_users>
<sfdc_user>
<sfdc_name>Mariano</sfdc_name>
<sfdc_last_name>Achaval</sfdc_last_name>
<sfdc_employee>true</sfdc_employee>
</sfdc_user>
<sfdc_user>
<sfdc_name>Julian</sfdc_name>
<sfdc_last_name>Esevich</sfdc_last_name>
<sfdc_employee>true</sfdc_employee>
</sfdc_user>
<sfdc_user>
<sfdc_name>Leandro</sfdc_name>
<sfdc_last_name>Shokida</sfdc_last_name>
</sfdc_user>
</sfdc_users>
mappings
[
{
"source": "sfdc_name",
"target": "name",
"default": "---"
},
{
"source": "sfdc_last_name",
"target": "lastName",
"default": "---"
},
{
"source": "sfdc_employee",
"target": "user",
"default": true
}
]
[
[
{"name": "Mariano"},
{"lastName": "Achaval"},
{"user": "true"}
],
[
{"name": "Julian"},
{"lastName": "Esevich"},
{"user": "true"}
],
[
{"name": "Leandro"},
{"lastName": "Shokida"},
{"user": true}
]
]