Assign issue to last transtionion executor

[Marcin Beczynski]

Hey,
I'm trying to write script what will assign issue to last transition executor, script should be triggered by postfuncion in different transition. Code what I write below, unfortunately didn't works

for example 

from In progress to X (Transition from where I want to take value from ) and then from X to in porgress (Transition where script should be triger)

Jira version 7.3.6

SC 5.0.6

import com.atlassian.jira.issue.history.ChangeItemBean;
import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.issue.MutableIssue;
import com.atlassian.jira.issue.history.ChangeItemBean;
import com.atlassian.jira.issue.changehistory.ChangeHistoryManager;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;

MutableIssue issue = issue;
def userManager = ComponentAccessor.getUserManager();
Logger log = log;
log.setLevel(Level.INFO);

def changeHistoryManager = ComponentAccessor.getChangeHistoryManager()
def changeHistories = changeHistoryManager.getChangeHistories(issue)

def previousExecutors = changeHistories.collect {history ->;
    history.getChangeItemBeans().findResults {ChangeItemBean change ->;
        if (change.getField() == "assignee" && change.getField() == "In Progress" ) {
            return change.getFrom()
        }
    }
}.flatten()

def Name = changeHistoryManager.getChangeHistory(issue).get(row).getAuthorUser(); 
def NameOfPerson = userManager.getUserByName(previousExecutors)?.directoryUser;
issue.setAssignee(NameOfPerson);

Thanks in advice for all help and hint

[Neil Arrowsmith]

Wouldn't it be easier to store the user who does In Progress -> X in a custom field, and then read that field to set the assignee when doing X -> In progress? That's the approach i've used with a similar requirement before.

[Marcin Beczynski]

yep of course would be esier but right now I can't use new cusom field