Gatling Time Extraction From Response Body - scala

Question

I am completely new to Gatling/Scala.
I have a scenario to execute. Here it goes:
-->Change the shift timings of the employees.
For the above, I am able to script/code the flow. However, I have a challenge:
-> I need to extract the "new" time values from the response and check if that matches with the "new" time values being passed through the parameter (csv) file.
Approach/logic: Extract the date values from the response body and compare that with the date value that has been provided in the csv file.
Sample Response:
{
"employeeId":"xxxxxx",
"schedules":
[
{
"date":"2019-11-25",
: : : "schedules":
: : : [
: : : : {
: : : : : "employeeId":"xxxxxx",
: : : : : "laborWeekStartDate":"2019-11-25", //New edited time
: : : : : "laborWeekEndDate":"2019-12-01", //New edited time
: : : : : "schedules":
: : : : : {
: : : : : : "startTime":"2019-11-25T18:15:00.000Z",
: : : : : : "endTime":"2019-11-25T23:45:00.000Z",
: : : : : : "departmentId":xxxxx,
: : : : : : "departmentName":"abc",
: : : : : : "lastModifiedTimestamp":"2019-12-11T09:22:44.000Z",
: : : : : : "breakDetails":
: : : : : : [
: : : : : : : {
: : : : : : : : "startTime":"2019-11-25T21:00:00.000Z",
: : : : : : : : "endTime":"2019-11-25T21:15:00.000Z",
: : : : : : : : "type":"break"
: : : : : : : }
: : : : : : ]
: : : : : }
: : : : }
: : : ]
: : }
Here, in the below, the right-handside values need to be extracted and compared with the values provided in the csv file.
"startTime":"2019-11-25T18:15:00.000Z",
"endTime":"2019-11-25T23:45:00.000Z",
Please help in performing the above. A step-wise detailed explanation would be much appreciated considering I am totally new to this.
Thanks!

Answer 1

Disclaimer: I will provide some useful links that should help you in achieving the task. If you will encounter any problems doing it, just post a new question
In order to get a value from a JSON response, you could use a jsonPath HTTP response body. There is an example here, how value can be extracted and saved using this method :JSON Path Usage for Gatling Tests
Reading values from CSV file is possible using a built-in feeder functionality: CSV feeders .Once you have the feeder added, you can reference a value using ${columnName} There is an example here: Step 03: Use dynamic data with Feeders and Checks.
After this step you have both values in session. Then using scala language, you should be able to compare those values. Getting a value from session happens using session("variableName").as[String]
For example, you could do a String comparision, if you first substring the value from csv. Scala String comparision Another option is like described here, which is really close to your requirement : How to compare responses from http calls in gatling?
Good luck! :)