jira groovy issue assigned problem

[AbrahamA]

Hello

Issue is getting assigned to number (Ex: 13329) instead of user. Here is my script

How can I get it assigned to user instead of number.

(Also any better way to save I see warning symbol)

Please let me know.

Thanks

Abe

import com.atlassian.crowd.embedded.api.User
import com.atlassian.jira.issue.fields.CustomField
import com.atlassian.jira.project.Project
import com.atlassian.jira.project.ProjectManager
import com.atlassian.jira.user.util.UserManager
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.ComponentManager
import com.atlassian.jira.security.roles.ProjectRoleManager
import com.atlassian.jira.security.roles.ProjectRole
import com.atlassian.jira.security.roles.ProjectRoleActors
import org.apache.log4j.Category
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.component.ComponentAccessor
import org.apache.log4j.Logger
import org.apache.log4j.Level
import com.atlassian.jira.user.ApplicationUser

def log = Logger.getLogger("com.sam.parallel")
log.setLevel(Level.DEBUG) 
//Issue issue = issue
def issueManager = ComponentAccessor.getIssueManager();
Issue issue = issueManager.getIssueObject("SIG-22" )
Project project = issue.getProjectObject()
//log.debug(project.getName())
UserManager userManager = ComponentManager.getComponentInstanceOfType(UserManager.class) as UserManager
def currentAssignee = issue.getAssignee()
ComponentManager componentManager = ComponentManager.getInstance()
def projectRoleManager = ComponentAccessor.getComponent(ProjectRoleManager)
// Get Parallel Approver Project Role
ProjectRole approverProjectRole = projectRoleManager.getProjectRole("Parallel Approvers")
ProjectRoleActors myAppro = projectRoleManager.getProjectRoleActors(approverProjectRole, issue.projectObject)
Set users = myAppro.getUsers()

Collection alist = new ArrayList()
users.each {
    alist.add(it.getId())    
}
Collections.shuffle(alist)
// Assign issue to first user after shuffle
log.debug( alist.get(0).toString() )
issue.setAssigneeId(  alist.get(0).toString()  )
issue.store()

[AbrahamA]

ok found it needed to put key instead of id.

users.each {
alist.add(it.getKey())
}