Create Global Function in Dataweave 1.0

Question

I am running %dataweave 1.0 . I need to create a function which should replace some code values according to a certain payload which is received from an API call in my Mule flow. The sample API output is given below: This is stored in a session variable currently.

{
    "CodeMaster": {
        "PrimaryCodes": {
            "PrimarySpecCodes": {
                "ABC": {
                    "code": "Alpha Bravo Charlie",
                    "target": "SALES",
                    "Field": "PrimarySpecCodes"
                },
                "TUV": {
                    "code": "Tango Umbrella Victor",
                    "targetSystemCode": "SALES",
                    "targetCodeFieldName": "PrimarySpecCodes"
                },
                "XYZ": {
                    "code": "X-Ray Yankee Zulu",
                    "targetSystemCode": "SALES",
                    "targetCodeFieldName": "PrimarySpecCodes"
                }
            }
        }
    }
}

As shown above, I need to create a function which will replace the codes (like ABC, TUV, XYZ) in my main payload with the values "Alpha Bravo Charlie", "Tango Umbrella Victor" and "X-Ray Yankee Zulu" respectively. In the main payload, I have the data to be replaced like below:

"PY123":
  {
      "Country": "GB",
      "Status": "ACTIVE",
      "Flag": null,
      "SpecCodes": [
        {
          "PrimarySpecCodes": "ABC"
        },
        {
          "PrimarySpecCodes": "TUV"
        },
        {
          "PrimarySpecCodes": "XYZ"
        }
      ]
    }

How can I create a function to replace the code values. If there is a better solution to replace codes, please suggest. Thanks in advance.

Answer 1

%dw 1.0
%output application/json

%function buildLookup(codes)
  codes mapObject {($$): $.code}

%var codeLookup = buildLookup(sessionVars.code.CodeMaster.PrimaryCodes.PrimarySpecCodes)

%var verboseCodes = payload.PY123.SpecCodes map (code) ->
  code mapObject {($$): codeLookup[$]}
---
{
  "PY123" : {
    "Country"   : "GB",
    "Status"    : "ACTIVE",
    "Flag"      : null,
    "SpecCodes" : verboseCodes
  }
}