Flagged base class

application_record.rb

# This works because the first constant classes are assigned to automagically becomes their main name

ApplicationRecord = if feature_flag?
  Class.new(ActiveRecord::Base) do
    # implementation
  end
else
  ActiveRecord::Base
end

=begin
[20] pry(main)> def feature_flag?; false; end
[21] pry(main)> class Quux < ApplicationRecord; end
=> nil
[22] pry(main)> Quux.superclass
=> ActiveRecord::Base
=end