How to auto populate value from Custom field to Assignee(System field) in JIRA?

Question

Hello All,

I am trying to make some changes on my JIRA project where I have a Customfield (Single select or Free Text Type) and Assignee (system Field). When I create a Bug or Changes Assignee in any Transition, I would be using my Customfield to add the username and I want that username to be auto populate into Assignee field. But, if the username listed in Customfield does not exist as an active user in JIRA project, set the Assignee to Automatic or Unassigned. Where as if the username listed in Customfield exist as an active JIRA project user, copy that username from Custom field to the Assignee field.

How do I do this?

I tried to do this in Post function via "Copy value" function. It works only when the username listed in Customfield is an active jira project user. If the user listed in Customfield is no active jira project user, I get error message "Error creating issue: Unable to copy value from field '<customfield> to 'Assignee''".

Sanjay_rlnb0n · Answer

Hi,

You can check Atlassian documents on getting an idea of postfunctions

Eg:

https://developer.atlassian.com/jiradev/jira-platform/guides/workflow/tutorial-creating-workflow-extensions#Tutorial-Creatingworkflowextensions-Part2.Createtheworkflowpostfunction

JIRA_USER · Answer

Hi Sanjay,

Exactly, my approach was the same but I am not there yet. I am new to groovy/jira so may be I am not able to put the correct script on the right place. Would you please help me to acomplish the solution?

Thanks in advance.

Sanjay_rlnb0n · Answer

Hi,

Basically assignee field can have only a jira active user. Here, you are trying to set the assignee field with a wrong value and thats why the error is.

It is as same as if you go to UI and type a user in assignee field, you will get a list of active users only. You can't put a wrong value there and update the assignee field.

Solution : You can write a postfunction where there will be a check that the value in customer field is a valid user then copy value.

Else populate assigne with unassigned.

Regards,

Sanjay