How can I update a single select custom field with a post function groovy script?

[Mick Lovell]

The error I am receiving is 'Cannot cast object with class 'com.atlassian.jira.customfields.option.LazyLoadedOption' to class 'java.util.Map'.

I've tried a couple of ways resulting in the same error, but here is the code I am currently working with:

 import com.atlassian.jira.issue.Issue
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira. issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.user.ApplicationUser
import com.atlassian.jira.event.type.EventDispatchOption
import com.atlassian.jira.issue.CustomFieldManager
import com.atlassian.jira.issue.fields.CustomField
import com.atlassian.jira.issue.customfields.option.*

def issue = issue as MutableIssue
def issueManager = ComponentAccessor.getIssueManager()
CustomFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager()
def changeHolder = new DefaultIssueChangeHolder()
def user = ComponentAccessor.getUserManager().getUserByName("admin")
def optionsManager = ComponentAccessor.getOptionsManager()

def cf = customFieldManager.getCustomFieldObjects(issue).find{it.name == "Authorization processed result"}

Option breachedOption = ComponentAccessor.optionsManager.findByOptionId(199944)
Option notBreachedOption = ComponentAccessor.optionsManager.findByOptionId(199945)

cf.updateValue(null, issue, new ModifiedValue(issue.getCustomFieldValue(cf), notBreachedOption), changeHolder)

[fjodors]

Hello

Check this article https://community.atlassian.com/t5/Jira-questions/How-set-custom-field-value-in-Issue-Create-event/qaq-p/1216402#M388386

and this https://community.atlassian.com/t5/Adaptavist-questions/Listener-Clone-ticket-is-not-updating-a-CF-after-creation/qaq-p/918043

You need setCustomFieldValue method together with updateIssue