How to decrement a custom field

Question

I would like to decrement the value in a custom field via post function.  I have found the ability to increment by 1 unit (by addon I believe), but not decrement.

I have tried this using a groovy script post function but believe this is not correct:

issue.get(“customField_10426”) = issue.get(“customField_10426”) - 1

Mark McCormack (Adaptavist) · Answer

Converting Jamie's comment to an answer:

it's helpful to use that tag, otherwise you will get answers for groovy... JMWU tacks on some extra methods that aren't in the API.

JamieA · Answer

it's helpful to use that tag, otherwise you will get answers for groovy... JMWU tacks on some extra methods that aren't in the API.

Todd Winton · Answer

Yes.