How to loop over a GET request and do a POST every key found - postman

Question

Just started playing around withPostman a week ago to make life easier.
Situation :
I have a get request which returns x amount of key (Jira userstories)
What do i want to achieve :
I want to create subtask for each of the keys i get back from the GET request with Postman
The POST part on how to create the subtask is already done. My issue is specifically looping through the GET request list to create it for every story.
Any help would be much appreciated
My postman GET request :
{
"expand": "schema,names",
"startAt": 0,
"maxResults": 50,
"total": 8,
"issues": [
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "59332",
"self": "xxx",
**"key": "GRIP-502"**
},
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "58465",
"self": "xx",
"key": "GRIP-429"
},
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "56409",
"self": "xxxx",
**"key": "GRIP-338"**
},
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "55191",
"self": "xxx",
"key": "GRIP-246"
},
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "55180",
"self": "xx",
**"key": "GRIP-244"**
},
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "52783",
"self": "xx",
"key": "GRIP-104"
},
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "51641",
"self": "xxx",
"key": "GRIP-69"
},
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"id": "51473",
"self": "xx",
"key": "GRIP-48"
}
]
}

Answer 1

in the first request where you get the information store the issues into a variable:
pm.environment.set("issues",pm.response.json().issues)
In the pre-request section of the POSt request you want to send use :
let array = pm.environment.get("issues")
let issue = array.pop()
pm.environment.set("issues",array)
pm.environment.set("id",issue.id) // or key what ever you want
array.length!==0?postman.setNextRequest(pm.info.requestName):null

Answer 2

You could write a javascript function to iterate and process each issue in your response. For example:
function createSubTask(issueId) {
console.log(`POST Subtask: ${issueId}`);
}
for (let subtask of response.issues) {
createSubTask(subtask.id)
}
You can find more help here