Looping Test Case - write out REST response value from each loop for use later

richie, ideal solution is to store enityids in a test suite property as a comma separated values. I will update the post if I find a better solution.

For now,  you could store entity id values in a flat file. 

import net.sf.*
import net.sf.json.*
import groovy.json.JsonSlurper

//## Get Directories ##//
def projectPath = context.expand('${projectDir}')

//Parse json response
def response = context.expand( '${RESTRequest#Response}' )
def json = new JsonSlurper().parseText response

//get entityId record from json response
def entityId = json.entityid

log.info "creating EntityID file..."
//## Populate entityId data file ##//
def entityIdFile = projectPath + "\\entityId.txt"
      entityData = new File(entityIdFile)

 log.info "entityID from the rest request is - $entityId"
 log.info "Writing entityId to datafile..."
 entityData.append("$entityId" +'\r\n')

  It will be nice to clear the file once you execute desired testcase or testSuite. (Probably in testSuite or project teardown script or a separate groovy step)

//## Get Directories ##//
def projectPath = context.expand('${projectDir}')

log.info "Clearing EntityID file..."

def entityIdFile = projectPath + "\\entityId.txt"
      entityData = new File(entityIdFile)
      entityData .delete() // Clear File Contents //