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The following guide will show you how Effectors can be used to update the Assignee for issues to match their parent-issue's Assignee.
In this example, we've used Insert and Extend generators to build an Epic > Story hierarchy. Each epic has been assigned to a team member, but the stories are still unassigned. We're going to use the Attribute to Issue Field Effector, along with a Structure formula, to change the assignee of each story to match its corresponding epic.
Click the + icon to the right of the column headers, and select Formula...
Give the column an appropriate name, and enter the following formula: PARENT{Assignee}
Now we need to take the information from our formula (which is only available in Structure) and write it to the Assignee field (so it is available anywhere in Jira).
Open the Automation menu and select Effectors.
Choose Attribute to issue field...
On the Effector settings screen:
Issuetype != Epic
Click Save, and the Effector will be added to the structure.
Locate the Effector at the top of the structure and click the Action button (the three dots to the right of its row). Select Run.
You have the option to Preview effects before applying. This allows you to view and approve every change that will be made by the Effector. Effectors update live Jira data, so we highly recommend using the preview option. Click Run to begin.
Once the preview is finished, you will see a list of changes that will be made by the Effector. You can select which changes you want made, or click Select All to apply all changes.
Once you've applied the selected changes, the Assignee field for each child issue should be updated to match its parent's Assignee: