How to automate a multi-select user field in team-managed projects?

[Petr Sigaev]

We use a team-managed project (NextGen) in JIRA.

Problem

I am trying to create an automation that edits newly created issues: I want certain fields to be copied from the parent epic. My automation works with default fields like assignee and labels because I am able to pick them in the dropdown menu when creating an automation. My user multi-select field is custom and therefore doesn't show up in the dropdown menu when editing an automation. I suppose, I have to use the advanced text box to make it all work the way I need it to.

What I've tried

I've tried searching forums and copy-pasting (and editing cutom field ID or name) code other users have suggested into my automation, but that didn't work. I've also tried reading through JIRA documentation and copy-pasting (and editing custom field ID or name) code from there, but this also didn't work.

The best result I've got is automation saying it worked OK but not actually editing the custom user field. Other times I would either get an error saying 'data was not an array (customfield_10059)' or 'Error while parsing additional fields. Not valid JSON.'

Any help would be greately appreciated, thank you!

[Nic Brough -Adaptavist-]

Yes.