How do I record each request and response within the same test step?

Hi.  I am not using it in the tear down script. I have one POST request and another step for the groovy script... here is what I've tried:

/*Read in the next line of the file
  We can use the same fileReader created in the Setup script because it
  was assigned to the context variable.*/
nextLine = context.fileReader.readLine()

if(nextLine != null){
 String[] propData = nextLine.split("\\,")
 curTC = testRunner.testCase
 curTC.setPropertyValue("systemId",propData[0])
 curTC.setPropertyValue("partnerId",propData[1])
 curTC.setPropertyValue("honorificPrefix",propData[2])
 curTC.setPropertyValue("first",propData[3])
 curTC.setPropertyValue("middle",propData[4])
 curTC.setPropertyValue("last",propData[5])

	// Define collection of test steps
	def soapuiRequests = testRunner.testCase.getTestStepsOfType(com.eviware.soapui.impl.wsdl.teststeps.RestTestRequestStep)

	//Groovy Script to loop through each requests in the test case.
	soapuiRequests.each{
		//Creating file name using current date and time
		Date startTime = new Date();
		def cur_Time = startTime.getMonth() + 1 + "_" + startTime.getDate() + "_" + startTime.getHours() + startTime.getMinutes() +startTime.getSeconds()
		def fileName = it.name + "_" + cur_Time
		def path = "/Users/tester/Documents/test/"
		def apiFile = new File(path + fileName + ".json")

	apiFile.write("\n\n");
	apiFile.append(context.testCase.getTestStepByName(it.name).getProperty("rawRequest").value)
	apiFile.append("\n\n");
	apiFile.append(context.testCase.getTestStepByName(it.name).getProperty("Response").value)
	apiFile.append("\n\n");
	}

 testRunner.gotoStep(0)
}

That code loops through rows of data I use for my JSON request then it creates a new file which SHOULD save each unique request and response.

Can you please give me a suggestion on how to do this correctly? How do I make a groovy assertion that also saves the request/response?

EDIT:

Rao, I just tried this (added it as an assertion to my POST request) but the results are the same. The script creates one file with one response.

//Check if there is response
assert context.request, "Request is empty or null"

//Save the contents to a file
def saveToFile(file, content) {
    if (!file.parentFile.exists()) {
         file.parentFile.mkdirs()
         log.info "Directory did not exist, created"
    }
    file.write(content) 
    assert file.exists(), "${file.name} not created"
}

def f = new File("/Users/tester/Documents/test/testfile.json")
saveToFile(f, context.response)