Prohibit certain links through validator script

Question

I would like to only allow one type of link to be used through a validator and prohibit the other link types. But I also need to allow the transition to occur if there are no links. I've been able to get everything to work except "null." Any help would be appreciated.

issueLinkManager.getOutwardLinks(issue.getId())*.issueLinkType.name.contains('Dependents'||'null')||
 ! issueLinkManager.getOutwardLinks(issue.getId())*.issueLinkType.name == ('Blocks')||
 ! issueLinkManager.getOutwardLinks(issue.getId())*.issueLinkType.name == ('Cloners')||
 ! issueLinkManager.getOutwardLinks(issue.getId())*.issueLinkType.name == ('Duplicate')||
 ! issueLinkManager.getOutwardLinks(issue.getId())*.issueLinkType.name == ('Relates')

Josh Costella · Answer

@Jamie Echlin [Adaptavist] - The scenario you just described is exactly what we are trying to accomplish. I tried the workaround you suggested but it's giving the same result as before.

import webwork.action.ActionContext
def request = ActionContext.getRequest()
if (! request) {
    return true 
}
def linkedIssueKeys = request.getParameterValues("issuelinks-issues")
def linkedIssueType = request.getParameter("issuelinks-linktype")
log.debug("linked issues: " + linkedIssueKeys) // can be null, or a String[]
log.debug("linked issues: " + linkedIssueType) // a String

def links = issueLinkManager.getOutwardLinks(issue.getId())
links*.issueLinkType*.name.unique() == ["Dependents"]

JamieA · Answer

Should work fine. Are the links being modified on the screen for the action that the validator happens in? If so that doesn't work, due to a JIRA "design failure"... There is a possible workaround here: https://scriptrunner.adaptavist.com/4.2.0.2/jira/recipes/workflow/validators/simple-scripted-validators.html#_checking_linked_issues

Josh Costella · Answer

@Jamie Echlin [Adaptavist] We need the "Dependents" link to be the only link allowed to pass the validator OR no link to also pass.

I'll also need to specify certain links allowed for certain issue types but that's secondary to this.