How do I compare and update a custom field value be subtask and parent in a script listener?

[Deleted user]

I'm trying to update a custom field when the field is updated on the subtask so the parent shows the new value.

in the Script Listener console, issue.fields.parent.key doesn't work because 'parent' is not a known class in JSON.

I got that line from the Scriptrunner for JIRA Cloud examples.

[Neta Elyakim]

It's will work on Listener like that

if(issue.fields.issuetype.subtask == true){    
  String parentkey= issue.fields.parent.key  
}

and if you are in script console do this:

 def issueKey = 'COPY-19' // enter you sub task key here

def result = get('/rest/api/2/issue/' + issueKey)
 .header('Content-Type', 'application/json')
 .asObject(Map)
if (result.status == 200){
 def parentIssue = result.body.fields["parent"]
 return parentIssue["key"]
} else {
 return "Failed to find issue: Status: ${result.status} ${result.body}"
}