Only-Except, not_nil?

Good day!
I can’t find two tiny features in Rails that are necessary in my mind. I’m sorry if I’m not right. Thanks for attention!

  1. Only-Except filter method. Such as in before_filter. This feature is used really often. But I found no method for this in ActiveSupport…
  1. Is Object#not_nil? logical, isn’t it? It will replace
    (not obj.nil?) ? something_main_and_important : ‘no’
    to (beautiful)
    obj.not_nil? ? something_main_and_important : ‘no’

Amn’t I right?