Post function: Custom field not appending data on transition

[daniel_gamez]

I am trying to update a custom field on a post function inside a transition.

The post function is executed when Issue is moved from state 'IN REVIEW' to state 'TO DO'.

Datetimes array is a custom field of type Text(multiline) 

The issue is setting the date, but not appending future changes 

And this is the history of the issue

[John Funk · Accepted solution]

Hi Daniel - Welcome to the Atlassian Community!

I don't know what it is not appending the value and is instead replacing the value. You might want to create a support ticket for Atlassian to investigate. 
Another option is to create an Automation For Jira rule and try to append it that way. 

[daniel_gamez]

Opted for this solution, added a rule triggered by the transition from `IN REVIEW` to `TO DO` to add a comment with the date, just a workaround, will see if I can hide the comments and disable each notification for this particular rule, thank you very much! 

[Nic Brough -Adaptavist-]

It's because the function you are using is for updating fields, not adding to them.  If you were using a field that has multiple values, it would be adding to it, but you're using a text field, which is a single value, so it's updating.

[John Funk]

Hmm, that description is very misleading then as it says it will append the value. "If set, the given value will be appended to the field."

[daniel_gamez]

I thought of that as well, so I tried to change the value from '%%CURRENT_DATETIME%%' to '*' which it would append to the current value, resulting in an iterative 1 line * per trigger