Using automation rules, how to get the count of subtasks of parent issue

[小川晴道]

I can not get by script "{{issue.parent.subtasks.size}}".

When story={subtask_a, subtask_b, subtask_c}, then I want count 3.

how do I get ? what script do I write ?

Kind regards,

[小川晴道 · Accepted solution]

This is self answer.
{{issue.subtask.size}} is OK.

親タスクのサブタスクの進捗率を合算する計算は、以下となりました。
{{issue.subtasks.進捗率[%].sum.divide(issue.subtasks.size).round}}