NS: Generate a unique UUID for a Customer

customerUuidBeforeSave.ns.js

/** 
 *@NApiVersion 2.x
 *@NScriptType UserEventScript
 */

// Load two standard modules.
define ( ['N/record', 'N/search', 'N/ui/serverWidget'] ,
    
    // Add the callback function.
    function(record, search, serverWidget) {
        // In the beforeSubmit function, add test to the Notes field.
        function myBeforeSubmit(context) {
            if (context.type !== context.UserEventType.CREATE)
                return;

            function uuidv4() {
                return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
                    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
                    return v.toString(16);
                });
            }

            var custFldUuid = 'custentity_uuid';
            
            function checkForUniqueness() {
                var newUuid = uuidv4();
                var mySearch = search.create({
                    type: search.Type.CUSTOMER,
                    columns: [custFldUuid],
                    filters: [custFldUuid, 'contains', newUuid]
                });

                var myResultSet = mySearch.run();

                var resultRange = myResultSet.getRange({
                    start: 0,
                    end: 1
                });

                if (resultRange.length > 0) {
                    log.debug(resultRange[0]);
                    checkForUniqueness();
                }

                return newUuid;
            }

            var newCustomerRecord = context.newRecord;
            newCustomerRecord.setValue({
                fieldId: custFldUuid, 
                value: checkForUniqueness()
            });
        }
        
        // Add the return statement that identifies the entry point funtions.
        return {
            beforeSubmit: myBeforeSubmit
        };   
    });