smart value subtract from constant

[Andrew de Quincey]

Hi, I'm writing an automation and I'm wanting to calculate the inverse of a numeric field in an issue.

For example, I have a custom numeric Issue field called bob with values from 1 -> 5

In my smart value I want to calculate "5 - <value of bob in the issue>"

I've tried doing the following, but I get `None` as the result. How should I do this?

5.minus(issue.impact)

[Bill Sheboy · Accepted solution]

Hi @Andrew de Quincey 

I can think of a couple of ways to do this:

1. create a variable with the value of 5, and subtract your "impact" field from that
2. a bit of algebra:  (A - B) = (B - A) * -1 and so {{issue.impact.minus(5).multiply(-1)}}

Kind regards,
Bill

[Andrew de Quincey]

Ahhh duh, of course!

I think I prefer the second since it keeps it all together.

Thanks!

[Andrew de Quincey]

Got it: issue.impact.plus(-5)

[Andrew de Quincey]

no no, I'm wrong, that's still not what I want.