Update custom field when opening issue

[Dan Zaltsman]

Hi,

I'm trying to update custom field every time that im opening new issue

this is the script

mport com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.jql.parser.JqlQueryParser
import com.atlassian.jira.web.bean.PagerFilter
import com.atlassian.jira.issue.fields.CustomField
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.issue.search.SearchProvider

// get all the used Old_Test_ID so far
def query = ComponentAccessor.getComponent(Jmport com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.component.ComponentAccessor
def issueManager = ComponentAccessor.getIssueManager()
def issue = issueManager.getIssueObject("GEO-6")
def String myval = "my new text"
def customFieldManager = ComponentAccessor.getCustomFieldManager()
def textCf2 = customFieldManager.getCustomFieldObjects(issue).find {it.name == "hidden_start"}
if (textCf2) {
def changeHolder = new DefaultIssueChangeHolder()
textCf2.updateValue(null, issue, new ModifiedValue(issue.getCustomFieldValue(textCf2), myval),changeHolder)
}qlQueryParser).parseQuery("project = CEQB AND 'Old_Test_ID' is not EMPTY ORDER BY 'Old_Test_ID' DESC")
def results = ComponentAccessor.getComponent(SearchProvider).search(query,ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser(),new PagerFilter(1))
int maxOld_Test_ID = 0
CustomField cField = ComponentAccessor.getCustomFieldManager().getCustomFieldObjectByName("Old_Test_ID")

// get the highest used number
for(Issue documentIssue: results.getIssues())

{ maxOld_Test_ID = documentIssue.getCustomFieldValue(cField) as Integer }
// set the new number
def newOld_Test_ID = ++maxOld_Test_ID as String
issue.Old_Test_ID(cField, newOld_Test_ID)

i got error "cannot find matching method setcustomfieldvalue"