How do I assign a custom field "Fixed by" (User Picker) with the current assignee?

[Smitty]

How do I assign a custom field "Fixed by" (User Picker) with the current assignee?

[Nic Brough -Adaptavist-]

You need to use a bit of code - a post-function or listener can be used to set it to %current user% but there isn't one built into Jira and you'll need to find one to do it (I use the one in the Jira Suite Utilities)