Active Support - Presence
Active Support as a whole gets a bad wrap. Ruby is all about developer happiness and that is really what Active Support is all about.
It offers a richer bottom-line at the language level, targeted both at the development of Rails applications, and at the development of Ruby on Rails itself.
One small extension I love is
In short, it returns itself if .present? is true. Otherwise, it returns nil
1.presence # => 1
"Hello World".presence # => Hello World
"".presence # => nil
Unfortunately, I have seen much more usage of .present? directly.
name = user.name.present? ? user.name : 'N.A.'
This would be much simpler with
name = user.name.presence || 'N.A.'
If you are not familiar with Ruby, you may be asking why not just use
user.name || 'N.A.' directly. The present? (and related blank?) extension will handle empty strings which in Ruby are evaluated as truthy.