How to prevent transition unless sub-task exists

[Kevin Stark]

Is there any way to prevent a transition unless the issue has at least 1 subtask? I'm trying to prevent users from transitioning user stories through the story workflow until at least 1 subtask has been created.

[Henning Tietgens · Accepted solution]

You could use the Script Runner plugin with a simple scripted condition:

issue.subTaskObjects?.size()>0

Henning

[JamieA]

Or just:

issue.subTaskObjects

[Henning Tietgens]

Ok :-) I was not sure if the API maybe returns an empty collection...

[Chaithra N]

If you want to a prevent particular transition (i.e Tranistion must not be availble to end User), then you will have to write Custom Condition for this and in Condition Class you can check if Subtask is available or not.