Mapper to retrieve field value with null check

[bibhuti10785]

I have to extract "pw_cc__IsoCode_2__c" when in the payload "Country_of_Installation__r" is present.

Since both parent property Opportunity  and child property Country_of_Installation__r are optional field i need to  check if the node present before extracting the value. I tried in mapper  $.get('Opportunity').get('Country_of_Installation__r').get('pw_cc__IsoCode_2__c') but this throws can not invoke a method on null value.

Tried other javascript functions but most of them are not supported here.

can anyone help me with proper script.

[{

    "OpportunityId":"0063x00001bZVt8AAG",

    "Opportunity":

        {

            "Id":"0063x00001bZVt8AAG",

            "Country_of_Installation__r":

                {

                    "attributes":

                        {

                            "type":"aaaaaa",

                            "url":"/services/data/v60.0/bbbb"

                        },

                    "Id":"a4u120000008XpbAAE",

                    "pw_cc__IsoCode_2__c":"MZ"

                }

        }

}]

[SpiroTaleski]

@bibhuti10785 

You can try with this expression: 

$.hasPath("Opportunity.Country_of_Installation__r.pw_cc__IsoCode_2__c") ? $Opportunity.Country_of_Installation__r.pw_cc__IsoCode_2__c : null

Or, just simply map the field in the Mapper snap and check the Null-safe access checkbox.