Can I edit field of related issue via Listener's script?

[Jan Kurowski]

Hi!
I'm trying to add Custom Listener that would execute code after Issue Updated event occurs. The problem is that I don't know how to change linked issue's priority. 
I would appreciate any help!
 

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.*
import com.atlassian.jira.event.type.EventDispatchOption

def change = event?.getChangeLog()?.getRelated("ChildChangeItem")?.find {it.field == "Priority"}
if (change && event.issue.issueType=="Zadanie") {
def issueManager = ComponentAccessor.getIssueManager()
def issueBNGObj= issueManager.getIssueObject(event.issue.key)
def issueLinkManager = ComponentAccessor.getIssueLinkManager()

for(item in issueLinkManager.getOutwardLinks(event.issue.getId())){
def linkedIssue= item.destinationObject
def linkedIssueObj= issueManager.getIssueObject(linkedIssue.key)
def projName=linkedIssue.getProjectObject().name
if(projName=="Rejestr Potrzeb"){
linkedIssueObj.setFieldValue("priority", issueBNGObj.priority) // error lights up here
issueManager.updateIssue(event.user, linkedIssueObj, EventDispatchOption.DO_NOT_DISPATCH, false)
}
}
}

[Alex Christensen · Accepted solution]

On the line that's erroring for you:

linkedIssueObj.setFieldValue("priority", issueBNGObj.priority) // error lights up here

Try using this instead:

linkedIssueObj.setPriority(issueBNGObj.priority)

Priority is a system field, so you shouldn't need to use the .setFieldValue method, but the .setPriority() one instead. See the MutableIssue class for more methods like that.

[Jan Kurowski]

Thanks a lot! That helped.