Update Priority based on a Custom Field

    

        
        
        
            
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    import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.config.PriorityManager
import com.atlassian.jira.issue.customfields.option.LazyLoadedOption

final customFieldName = "Single Select List"

//Get custom field issue with this name
def customFieldManager = ComponentAccessor.customFieldManager
def customField = customFieldManager.getCustomFieldObjects(issue).findByName(customFieldName)
assert customField: "Could not find custom field with name $customFieldName"

def customFieldVal = issue.getCustomFieldValue(customField) as LazyLoadedOption

//Create priorities
def priorities = ComponentAccessor.getComponent(PriorityManager).priorities

def highestPriority = priorities.findByName("Highest")
def highPriority = priorities.findByName("High")
assert highestPriority && highPriority: "One ore more selected priorities doesn't exist"

//Assign priority depending on the custom field value
switch (customFieldVal?.value) {
    case "Audit (Internal)":
        issue.setPriorityId(highestPriority.id)
        break
    case "Audit (External)":
        issue.setPriorityId(highPriority.id)
        break
    default:
        log.debug "No need to change the priority"
        break
}