Why am I getting an ArgumentError on ActiveRecord find methods after upgrading to Ruby 3, but only on Heroku?

Question

After upgrading to Ruby 3.0.0 on my local machine, I can go to the console and enter:

User.find(1)

and it returns a user

After pushing to heroku, if I do the same thing, I instead get:

ArgumentError (wrong number of arguments (given 3, expected 1..2))

Anyone got any idea what could be happening differently to cause this?

Answer 1

Huh, turns out it was the gem for Scout, removed that and the error goes away!

https://github.com/scoutapp/scout_apm_ruby