How to fetch the last sub task details using grovy script

[Pratibha Tambakad]

Hello Team,

I want to display the workflow transition only for the last closing sub task under parent.

Parent can have may sub tasks under it, but we need to display one extra transition only when all the sub task are done and only one last sub task yet to complete which is in status 'In progress" and from In Progress we need to make new transition to be visible.

How do we do that I tried using lot of code snippet didn't work. I was able to fetch sub task size and their statuses but not able to fetch the last closing sub task details.

Help me to achieve this

Thanks

Pratibha