How to use filter in map - filter

Question

I have following code:
%dw 2.0 output application/json var attributeIdMapping =
${vault::attributeIdMapping}
--- {
"objectTypeId": 3,
"attributes": vars.requestBody mapObject (value, key) ->
{
"objectTypeAttributeId": (attributeIdMapping.attributes filter ($.name == key))[0].id,
"objectAttributeValues": [{
"value": value,
"key": key
}]
} }
attributeIdMapping:
{
"attributes": [
{
"name": "accountType",
"id": "87"
},
{
"name": "accountClass",
"id": "89"
},
{
"name": "accountName",
"id": "85"
},
{
"name": "displayName",
"id": "18"
},
{
"name": "accountCategory",
"id": "88"
},
{
"name": "accountNumber",
"id": "84"
},
{
"name": "description",
"id": "86"
},
{
"name": "accountGroup",
"id": "90"
}
]
}
vars.requestBody:
{
"displayName": "TestMulesoft2",
"description": "Test"
}
But my filter shows null in the end. As I understand key is not passed to level below map itself. How can I get this working?

Answer 1

I put all the input data inside the script to simplify reproduction. The problem seems to be using the operator == to compare a string and a key types returns empty. Using the operator ~= which attempts to coerce appears to return the expected result:
%dw 2.0
output application/json
var attributeIdMapping =
{
"attributes": [
{
"name": "accountType",
"id": "87"
},
{
"name": "accountClass",
"id": "89"
},
{
"name": "accountName",
"id": "85"
},
{
"name": "displayName",
"id": "18"
},
{
"name": "accountCategory",
"id": "88"
},
{
"name": "accountNumber",
"id": "84"
},
{
"name": "description",
"id": "86"
},
{
"name": "accountGroup",
"id": "90"
}
]
}
var requestBody = {
"displayName": "TestMulesoft2",
"description": "Test"
}
--- {
"objectTypeId": 3,
"attributes": requestBody mapObject (value, key) ->
{
"objectTypeAttributeId": (attributeIdMapping.attributes filter ($.name ~= key))[0].id,
"objectAttributeValues": [{
"value": value,
"key": key
}]
} }
Output:
{
"objectTypeId": 3,
"attributes": {
"objectTypeAttributeId": "18",
"objectAttributeValues": [
{
"value": "TestMulesoft2",
"key": "displayName"
}
],
"objectTypeAttributeId": "86",
"objectAttributeValues": [
{
"value": "Test",
"key": "description"
}
]
}
}