How to ignore impersonated user ?

[leoplct]

I want to exclude the impersonated user from tracking audits.
I know that I can use this, but it's worsened performance due to JOIN.

class CustomModel < ActiveRecord::Base
  audited unless: Proc.new { |m| m.profile.user.admin? }
end

I'd rather prefer to set it in the initializer. Would be possible?

config/initializers/audited.rb

Audited.max_audits = 1000
Audited.current_user_method = :true_user