How to get the current issue key before creation in behaviour plugin?

Krithica Gowri Shankar

import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.issue.CustomFieldManager;
import com.atlassian.jira.issue.IssueManager;
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.jira.issue.MutableIssue

def issue = ComponentAccessor.getIssueManager().getIssueByCurrentKey("DC_CM-1893");

def customField = ComponentAccessor.getCustomFieldManager().getCustomFieldObject(10731L);//customfield id
def appt = getFieldById("customfield_10729")
if(issue.getCustomFieldValue(customField) =~ 'JIRA')
{

appt.setHidden(true);
}
else
{ appt.setHidden(false);

}

We use the above script. In the above code the validation works with  existing issue " DC_CM-1893".

Whereas we need to use the behaviour for current issue in create screen. 

Not able to get the current issue key and apply validation.

Instead of existing issue we need the current issue which is about to create.

Please let us know how to achieve this.

Nic Brough -Adaptavist-

You can't.

The issue does not have a key until after the issue has been created - this effectively happens in post-functions that occur after the completion of the screen.