Key-Value Pair Selector (.&myKey)
The & selector acts on arrays and objects. & retrieves both the keys and values of all matching keys pairs in the current context. These are returned as an object, containing the retrieved keys and values.
DataWeave Script:
%dw 2.0
output application/xml
—
{
users: payload.users.&user
}
Input XML Payload:
<?xml version=’1.0′ encoding=’US-ASCII’?>
<users>
<user>Mariano</user>
<user>Martin</user>
<user>Leandro</user>
<admin>Admin</admin>
<admin>org_owner</admin>
</users>
Output XML:
<?xml version=’1.0′ encoding=’US-ASCII’?>
<users>
<user>Mariano</user>
<user>Martin</user>
<user>Leandro</user>
</users>
Note that unlike the multi-value selector, the output of this selector is an object, where the original keys for each value are also extracted.
Select All the Descendant Key-Value Pairs
This example uses the .. and & selectors in myVar.people..&name to select and return an array that contains all descendant objects from myData input that contain the key name. It also transforms the JSON input to XML output.
DataWeave Script:
%dw 2.0
var myData = {
“people”: {
“person”: {
“name”: “Nial”,
“address”: {
“street”: {
“name”: “Italia”,
“number”: 2164
},
“area”: {
“zone”: “San Isidro”,
“name”: “Martinez”
}
}
}
}
}
output application/xml
—
names: {(myData.people..&name)}
Output XML:
<?xml version=’1.0′ encoding=’UTF-8′?>
<names>
<name>Nial</name>
<name>Italia</name>
<name>Martinez</name>
</names>
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