string.concat mapper function not found

[mellistibco]

Trying to use the string.concat mapper function, as follows in the app json:

              "mappings": {
                "input": [
                  {
                    "type": "expression",
                    "value": "string.concat(\"Photo URL: \", $activity[rest_2].result.photoUrls[0])",
                    "mapTo": "message"
                  }
                ]
              }

The following error is thrown:

2018-03-23 07:45:56.228 ERROR  [function] - Execution failed for function [string.concat] error - No function string.concat found
2018-03-23 07:45:56.228 ERROR  [engine] - Execution failed for Activity[Log Message (2)] in Flow[Eval] - Expression mapping failed, due to Execution failed for mapping [string.concat("Photo URL: ", $activity[rest_2].result.photoUrls[0])] due to error - No function string.concat found
2018-03-23 07:45:56.228 ERROR  [flowmodel-simple] - Error evaluating activity 'log_4'[github.com/TIBCOSoftware/flogo-contrib/activity/log] - Expression mapping failed, due to Execution failed for mapping [string.concat("Photo URL: ", $activity[rest_2].result.photoUrls[0])] due to error - No function string.concat found

[lixingwang]

As we designed the function is part of contribution. So you need import function in import.go same with what activity/trigger does.

[mellistibco]

ok... we will need to fix that, since the functions aren't a contribution and they are in lib... This also means that you cannot build from webui using functions, as you'll have no way to add the import...

[lixingwang]

Yes, If that case. We need enhance cli to preload all fucntion we have so far, today we can manual add onto import.go file.

[mellistibco]

We need to register the default functions. If they are in lib the cli shouldn't need to do something special to import it... Will keep this open as a bug.